WO2020245487A1 - Pneumatic clamp for plates with tilting jaws - Google Patents
Pneumatic clamp for plates with tilting jaws Download PDFInfo
- Publication number
- WO2020245487A1 WO2020245487A1 PCT/ES2020/070373 ES2020070373W WO2020245487A1 WO 2020245487 A1 WO2020245487 A1 WO 2020245487A1 ES 2020070373 W ES2020070373 W ES 2020070373W WO 2020245487 A1 WO2020245487 A1 WO 2020245487A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- arm
- compensation
- clamping
- support body
- pneumatic gripper
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/14—Clamps for work of special profile
- B25B5/145—Clamps for work of special profile for plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/05—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work specially adapted for multi-stage presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
- B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/061—Arrangements for positively actuating jaws with fluid drive
- B25B5/064—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis perpendicular to the pressing direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/16—Details, e.g. jaws, jaw attachments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/16—Details, e.g. jaws, jaw attachments
- B25B5/163—Jaws or jaw attachments
Definitions
- the present invention refers to an improved pneumatic gripper for a stamping press or servo press with a transfer system, wherein the gripper is of the type that holds by means of two gripping tips, spaced apart, to a sheet or workpiece, close to the edge of the workpiece, and where said pneumatic gripper differs from those already known in that it allows to ensure with complete reliability that the two clamping points apply the same effort on the sheet, thus achieving that the transfer press is more reliable and productive, among other advantages that will be described later.
- Stamping presses are used in industry to shape metal parts, such as shaped sheets used in the automotive industry. These presses include an automatic sheet positioning and transfer system, commonly called a "transfer system", which allows the sequential punching of a sheet along a plurality of dies placed in the press.
- transfer system an automatic sheet positioning and transfer system
- the aforementioned automated positioning and transfer system includes a plurality of pneumatic grippers that are distributed along a pair of gripper-holder profiles located substantially parallel to each other and on both sides of the stamping dies. consecutive press releases. Both clamp-holder profiles are coupled to bars belonging to the transfer of the press capable of performing a back and forth movement in the direction of advance of the sheets to be stamped, so that a group of clamps associated with the same die is capable of hold a sheet to be stamped, transfer it to the next die, and go back to its original die, while the sheet stamping operation takes place. This process is repeated with the subsequent plates to be stamped or stamped.
- the aforementioned pneumatic grippers for stamping press with transfer system generally comprise arms for clamping the sheet to be stamped and a support body that is provided with an internal cavity where a pneumatic cylinder is housed.
- This cylinder has the function of operating a clamping arm of the gripper that is attached articulated to the support body.
- Each of the clamps includes tubes to feed the pneumatic circuit of the cylinder and electrical cables that feed one or more sensors for the presence of the sheet to be stamped.
- These clamping arms can be of different types, for example, one fixed and one mobile, or two mobile arms.
- all gripper devices are synchronized so that they simultaneously remove a workpiece from one workstation and transfer the workpiece to the next workstation.
- the stamping processes with presses that include a transfer system seek to increase production (that is, pieces per minute) by increasing the working speed of the system. As the working speed increases, the acceleration and deceleration of the transfer movement of the gripper with the clamped plate also increases. However, it has been found that the higher the speed of the system, the more effort the clamp must exert on the sheet to be stamped to prevent it from sliding or rotating due to the difference in forces at each clamping point during the transfer to the next workstation (i.e. to the next die).
- a first problem that can occur when trying to increase the working speed of the transfer process of the parts between dies is the loss of grip of a workpiece and the workpiece falling off.
- Another problem that can occur is the sliding (without falling) of the sheet held by one or more clamps, altering the entire stamping process and can trigger an accident, which can be very serious, for example, when placing in a misadjusted the sheet in the next die.
- This incident of faulty positioning of the sheet in the next die can stop the entire stamping process, which has a very negative impact on the performance of the entire press (not only that of that work station), and can also reach to damage the workstation itself.
- the Spanish Utility Model ES1140856U is known from the same owner, which describes an improved gripper for stamping press with transfer system.
- this clamp has the drawback that, in the embodiment of the movable upper arm provided with two spaced apart clamping points, said clamping points have a free end into which a profiled ball joint is inserted that protrudes slightly at the end. of said tips and configured to be able to rotate slightly and to make contact with the upper surface of the sheet.
- This free profiled end (which is able to rotate freely about 9 ° ) has the drawback that when there are two clamping points separated by a certain distance, a small unwanted misalignment of said points is created due to the vertical position where the respective points are mounted.
- each profiled ball joint is not exactly the same, which does not guarantee that the same effort is exerted on the upper surface of the sheet at each point.
- the plates sometimes have irregularities and slight inclinations that make the task of clamping the tips even more difficult.
- the clamp described in the Spanish Utility Model ES1140856U has pneumatic and electrical connections arranged in a fixed position on the side of the support body, which sometimes makes it difficult for the installer to position the pipes or cables in Said connections in the connection operation of the same because a specific position must be sought and sometimes the pneumatic connections and / or electrical cables feeding the plate presence sensor can be installed bent or in very forced positions, being able to be strangled , which causes an undesired limitation of the air passage.
- the clamp described in the Spanish Utility Model ES1 140856U has a fixed lower arm 3b on which the lower surface of the sheet rests and which has a short length, which does not allow an optimal support of the lower surface of the sheet, especially in cases where the sheet is supported cantilevered (that is, only on one side).
- the clamp described in the Spanish Utility Model ES1140856U has a support body 4 that is expensive to manufacture.
- the aim of the present invention is to provide an improved pneumatic gripper for a stamping press or servo press with a transfer system, wherein the gripper is held by two separate clamping tips to a sheet or workpiece, which makes it possible to ensure that the two clamping points apply the same effort on the sheet, among other advantages that will be described later.
- this clamp of the invention is intended to hold sheets or workpieces arranged in a cantilever, that is, one or more clamps hold a sheet or workpiece, but only on one of its sides.
- the clamp of the invention can also be used satisfactorily to clamp a sheet or workpiece on both sides, that is to say by providing at least one clamp on each side of the sheet, in order to provide greater clamping stability.
- the present invention provides a pneumatic gripper comprising a first arm and a second arm between which the sheet or part to be stamped is clamped and also comprises a support body that is provided, as minimum, of an interior cavity where a fluid-dynamic cylinder for actuating the first arm is housed, said cylinder being capable of actuating the first clamping arm of the gripper which is articulated to said support body.
- a fluid-dynamic cylinder for actuating the first arm is housed, said cylinder being capable of actuating the first clamping arm of the gripper which is articulated to said support body.
- an arm element whose body extends in the direction of a longitudinal axis Y-Y '; a compensation arm fixed in a swingable way to the front end of the arm element, where the compensation arm is arranged transversely to the Y-Y 'axis, and where said compensation arm comprises two through holes spaced a certain distance from each other, equidistant from the axis Y-Y ', one at each end of the compensation arm, configured to receive each clamping point inside, and wherein said compensation arm and the arm element are joined by means of tilting means configured so that the compensation arm can swing slightly from an X-X 'axis transverse to the Y-Y' axis; and respective clamping points arranged inside each through hole of the compensation arm, each clamping point provided with a fixing system, such as a nut or the like, configured to fix each point to the compensation arm.
- a fixing system such as a nut or the like
- the clamping tips comprise a respective ball joint provided with a contoured outer surface that protrudes slightly below its lower ends. In this way, the grip of the tips to the upper surface of the workpiece is substantially improved.
- the clamp of the present invention in addition to providing a greater holding capacity, which is its main objective, provides other advantages that are described below.
- the gripper of the invention can be of the type in which the first arm is a mobile arm that is hingedly connected to the support body and the second arm is a fixed arm of support that is integrated into the support body extending forward.
- the gripper of the present invention can also be of the type in which both the first arm and the second arm are respective movable arms that are hingedly attached to said support body.
- one or both of the mobile arms could have the tilting arm system that is the object of the present invention.
- the first clamping arm is of the type that comprises at the end opposite the pivoting arm of the first clamping arm a groove that serves as a guide for an actuator bearing, which is integrally connected to the rod of the actuating cylinder of the first arm.
- an actuator bushing eg treated steel bushing
- the bearing has the advantage over the bushing that the clamping force of the caliper is increased substantially (around 290%).
- the first clamping arm comprises the following elements:
- an arm element with a front end that has two flat side walls, and furthermore the arm element has a longitudinal hole in its front surface with a diameter and depth such to house a part of an inner shaft;
- the compensation arm includes two lateral holes through holes spaced a certain distance, equidistant from the axis of rotation, one at each end of the c-arm compensation, to receive each clamping point inside; • respective clamping points arranged inside each through hole of the compensation arm, each clamping point provided with a nut to fix them to the compensation arm and provided with a profiled ball joint slightly pro
- the inner shaft is fixed by means of a nut with a rear extension that is arranged inside the front end of the shaft and when mounted it abuts the front face of the compensating arm.
- the patella profiled lower end inserted in each of the fastening points is configured with such dimensions to enable rotation of maximum angle of 9 or.
- the compensation arm has a distance between the two tip holes of between 19 and 70 mm, for example 20 mm or 50 mm. The greater this distance between points, the greater the stability of the plate clamping.
- the second clamping arm comprises an extended surface that extends forwardly beyond the vertical plane where the clamping tips of the part are disposed.
- This extended surface enables the sheet to be conveniently supported on said extended surface, thereby substantially improving the holding of the sheet.
- the extended surface extends forward a length between 12 and 60 mm.
- the second clamping arm comprises, on said extended surface, a grooved surface in at least each zone where the tips rest, and where this (s) grated surface (s) comprise (s) grooves or grooves that extend in a direction transverse to the longitudinal axis YY 'of the support body (that is, they extend in the direction of advancement of the transfer).
- a grooved surface in the area where a tip rests occupies an area at least equal to the area of the lower part of the tip.
- a grooved surface can be provided in each area where the tips rest, or else a single grooved surface for both tips extending transversely.
- this grooved surface has regular grooves of equal depth that extend downward and that have a preferably trapezoidal or triangular section.
- the clamp of the invention can comprise, unlike conventional clamps, a rotatable ring that is externally held in a specific position on the support body, but with the possibility of rotating (preferably totally) around the support body, where the rotatable ring comprises fluid inlet and outlet intakes, and wherein the ring is configured to be externally coupleable to an external part of the support body.
- the rotatable ring also comprises a channel for passing the electrical connections of the sheet metal presence sensor. This ring allows to facilitate the insertion of the fluid inlet and outlet sockets and electrical wiring, that is to say, to gain in versatility in positioning the fluid inlet and outlet sockets and the electrical connections, as the ring can be rotated 360 ° around the support body, as appropriate in each case.
- the improved clamp of the invention preferably has a rear portion of the support body that has a grooved surface that facilitates the engagement of the rotatable ring without being removable, but rotatable.
- This grooved surface has a plurality of grooves at different points along the length of the support body and the purpose of which is to insert in them respective O-rings to channel the air conduits and also to help hold the ring in the specific position. working, and with the possibility of turning.
- the portion of the support body may comprise a non-return flap that prevents removal of the ring by the user.
- the two fluid inlet and outlet intakes can also be arranged, in a fixed way, leaving the rear face of the support body, preferably inserted immovably in the damping element that acts as a stop for the cylinder piston.
- This second embodiment without ring has associated a more economical cost compared to the previous embodiment with a ring as it has one less piece -the ring-, although, on the contrary, it may entail a length of the clamp plus the intakes that is somewhat higher than the solution with a ring.
- the improved clamp of the invention has a rear end configured to be fixed by any known mechanical means to a clamp-holder part.
- the support body of the improved caliper of the invention has, at least one outer part, substantially cylindrical in shape.
- the manufacturing cost of the support body is significantly reduced, as it is much easier to machine than a prismatic part, while the use of less material is required, so ultimately the cost Total manufacturing of the support body decreases.
- both the rear part of the support body and the front part have a substantially cylindrical outer part.
- the first clamping arm is hingedly connected to the support body of the gripper at an articulation point which is arranged substantially aligned with the second clamping arm. In this way, shorter clamping tips can be used, helping to reduce the overall weight of the arm.
- the improved gripper of the invention comprises a collised groove that serves as a guide for an actuator bearing that is integral with the rod of the actuating cylinder of said articulated arm.
- the holder of the present invention has observed that this actuator bearing contributes to lengthening the useful life of the caliper.
- the rear chamber of the cylinder for the inlet and outlet of fluid can comprise a damping element that acts as a stop for the cylinder piston, said damping element being dimensioned to absorb kinetic energy from the movement of the first arm articulated caliper clamping and contributes to higher arm speed.
- This damping element allows, advantageously, to reduce very significantly the noise made by the gripper while working, which allows improving the environmental conditions of the workplace.
- the clamp can comprise a sensor for the presence of the piece to be stamped that includes a supply cable for said sensor integrated in the portion of the support body that defines the second arm. This feature helps reduce the overall height of the gripper, thus saving space.
- Said fluid-dynamic cylinder is a pneumatic fluid cylinder with a diameter greater than 20 mm, for example, a diameter of 25 mm or 32 mm, which contributes to obtaining a gripper with a greater clamping force.
- the gripper comprises two inlet and outlet ports for the supply fluid of the fluid-dynamic cylinder (for example pneumatic), which are preferably arranged in the ring.
- the fluid-dynamic cylinder for example pneumatic
- the support body has 16% less weight.
- Figures 1 to 8 are drawings representing a first embodiment of the two-prong clamp object of the present invention. Specific:
- Figures 1 and 2 show perspective views of the first embodiment of the two-prong clamp object of the present invention, in the closed and open position, respectively.
- Figure 3 shows a side elevation view of the first embodiment of the two-prong clamp object of the present invention, in the closed position.
- Figure 4 shows a top plan view of the clamp of previous figures 1 to 3, in the closed position.
- Figures 5 and 6 show front and rear elevation views of the clamp of previous Figures 1 to 4, respectively, in the closed position.
- Figures 7 and 8 show longitudinal sections of the clamp of previous figures 1 to 6, in closed and open position, respectively.
- FIGS 9 to 15 are drawings showing a second embodiment of the two-prong clamp object of the present invention. Specific:
- Figures 9 and 10 show perspective views of the second embodiment of the two-prong clamp object of the present invention (in this case with a distance between prongs greater than the first embodiment), in the closed and open position, respectively. .
- Figure 11 shows a top plan view of the second embodiment of the clamp, in the closed position.
- Figures 12 and 13 show front and rear elevation views of the second embodiment of the clamp, respectively, in the closed position.
- Figures 14 and 15 show longitudinal sections of the second embodiment of the clamp, in closed and open position, respectively.
- FIGS 16 to 19 are drawings representing the first clamping arm of the first embodiment of the two-prong clamp object of the present invention, where:
- Figure 16 shows a perspective view of said first assembled clamping arm.
- Figure 17 shows an exploded perspective view of said first clamping arm.
- Figures 18 and 19 show views in two different perspectives of the rocker arm of said first clamping arm.
- Figure 20 shows the same figure in front elevation of the gripper of the second embodiment, where the small existing play of rotation angle cq between the rocker arm and the arm element has been represented.
- Figure 21 shows a perspective view of a third embodiment of the two-prong clamp object of the present invention, in the closed position, similar to the second embodiment, but in this case where the grooved surface of the second fixed arm occupies the entire extended surface.
- detail 1 that refers to the grooved surface
- detail 2 that refers to the lower end of the tip provided with a sphere (which is called in the jargon of the sector as a ball joint) which is profiled to provide friction with the surface of the sheet (not shown)
- detail 3 which refers to the zigzag shaped profile of the grooved surface.
- the tip is formed by a screw 21 provided with a lower hole where the profiled ball joint 22 is inserted.
- Figures 22a, 22b and 22c show the arrangement of the clamp of the first embodiment once it is installed in a clamp-holder support and it runs along a profile.
- FIGS. 23 to 28 are drawings that represent a fourth embodiment of the two-prong clamp object of the present invention, similar to the first embodiment, but in in this case there is no ring and the air intakes are arranged on the rear face of the caliper and where the second fixed arm does not have any extended surface, where:
- Figures 23 and 24 show perspective views of the fourth embodiment of the two-prong clamp object of the present invention, in the closed and open position, respectively.
- Figure 25 shows a side elevation view of the fourth embodiment of the two-prong clamp object of the present invention, in the closed position.
- Figure 26 shows a top plan view of the clamp of previous figures 23 to 25, in the closed position.
- Figure 27 shows a rear elevation view of the fourth embodiment of the clamp in the closed position.
- Figure 28 shows a longitudinal section of the gripper of the fourth embodiment, in the closed position.
- the pneumatic gripper 1, 100, 200, 300 includes two arms 3a, 3b for holding a piece to be stamped (not shown in any of the attached figures) and a body 4a, 4b of support that is provided with an internal cavity 27 where a fluid-dynamic cylinder 26 is housed (see figures 7, 8, 14 and 15).
- This fluid-dynamic cylinder 26 operates the first upper clamping arm 3a, which is mobile and is articulated to an axis 25 of the support body 4a, 4b.
- This action of the fluid-dynamic cylinder 26 is carried out by means of an actuator bearing 31 associated with the rod 28 of the cylinder 26.
- the rear chamber 27 of the pneumatic cylinder 26 comprises a damping element 29 that acts as a stop for the piston 30 cylinder.
- This damping element 29 absorbs the kinetic energy from the movement of the first clamping arm 3a, thereby reducing the noise produced by the pneumatic gripper 1, 100, 200, 300 during its operation.
- the pneumatic gripper 1 described in the first embodiment has a supporting body 4a, 4b made of treated steel and a pneumatic cylinder diameter of 25 or 32 mm.
- the second clamping arm 3b which corresponds to the lower arm and is fixed, is also integrated into the support body 4 of the pneumatic gripper 1, 100, 200, extending from a front portion 4a of the support body 4 itself, as It is observed in the attached figures.
- the first movable arm 3a has in all cases two clamping points 2a, 2b for the sheet to be stamped.
- the two clamping tips 2a, 2b are quite close to each other, approximately 20 mm, while in the second embodiment 100 and in the third 200 of the gripper they are further apart, about 60 mm.
- the pneumatic gripper 1, 100, 200 of the present invention is characterized by the fact that the first mobile articulated clamping arm 3a is formed by an arm element 19 and fixed transversely with a slight play to its front end a compensation arm 10 , wherein said compensation arm 10 comprises two through holes 13 spaced a certain distance from each other, one at each end of compensation arm 10 to receive inside each clamping point 2, and a respective set of nuts 12a, 12b and screw to fix superiorly each clamping point 2 inside each hole 13, and wherein said compensation arm 10 and arm element 19 are configured with tilting means so that the compensation arm 10 can be slightly tilted with respect to the axis longitudinal arm element 19.
- the first mobile articulated clamping arm 3a which is formed by an arm element 19 and fixed transversely by means of a slight play to its front end a compensation arm 10, is clearly shown in figure 16.
- the arm element 19 has a front end that presents two flat lateral surfaces 33, and furthermore the arm element 19 has a longitudinal hole 18 that begins on its front surface with a dimension and length such to house a inner shaft 13 (shown, for example, in Figures 7, 15 or 17).
- a longitudinal hole 18 has a length slightly greater than the length of the inner shaft 13, once it is correctly assembled inside and fixed by means of a nut 20.
- the compensation arm 10 which is shown separately in Figures 17, 18 and 19, has an elongated body of a certain thickness provided on its rear surface with a central hole 22 (see Figures 18 and 19) that extends in a transverse direction to the compensation arm 10 with a dimension such as to house part of the shaft 13 and also provided on this rear surface with a recess 23 that defines an engaging surface with at least two flat side walls 33 and where the distance between said flat walls is slightly greater than the distance between the two flat lateral surfaces of the arm element 19, so that the arm element 19 is perfectly fitted in this recess 23 but has a slight angle tilt play between 0 and 10 ° of the compensation arm 10 with respect to the longitudinal axis of the first arm.
- this play of the compensation arm 10 is represented schematically, between 0 and 10 ° above or below the longitudinal axis of the arm element. That is, there would be 5 or above and 5 or below with respect to the longitudinal axis X-X 'of the arm element 19.
- the inner shaft 13 is arranged inside both holes 22, 18 of the compensation arm 10 and the arm element 19, and where the compensation arm 10 is joined through the inner shaft 13 and the arm element 19 and at the same time the axis allows the slight tilting of one of the two pieces 10, 19 around said inner axis 13.
- FIG. 1 Another characteristic of the pneumatic gripper 1, 100, 200 of the present invention lies in the particular configuration of the outer surface of the support body 4a, 4b which, as can be seen in Figures 1 to 15, is substantially cylindrical. It has a cylindrical rear portion 4a, which extends frontally forming another front portion 4b, also substantially cylindrical.
- an extended surface 15 of the second clamping arm 3b wherein said extended surface 15 comprises a part or all of its upper surface in form of grooves 14.
- these two grated surfaces 14 are formed by a plurality of homogeneous grooves extending transversely to the longitudinal axis of the support body 4a, 4b.
- these two grated surfaces 14 occupy the entire surface of the extended section 15, while in the case of Figures 1 to 15 they only occupy a part (that is to say not all) of said extended sections 15.
- said two grated surfaces 14 have regular grooves of equal depth and the same section (in this case a section in the form of a zigzag with a triangular profile).
- detail 3 which corresponds to a groove, it can be seen that its depth is around 0.5 mm, the distance between the tips of the ridges is 1 mm and the angle between two contiguous ridge planes is 90 ° .
- This specific configuration of the plurality of grooves has been shown by the owner to be very advantageous, in order to provide optimum friction with the inner surface of the sheet, which rests on the lines of the different ridges that make up this grooved surface.
- a detail 2 can be seen in which the configuration of the lower part of the screw 21 that configures the tip 2b or 2a and whose lower end has a profiled spherical ball joint 22 inserted inside said lower end.
- Said ball joint spherical shaped 22 has the ability to rotate about 9 or about the body of the screw 21.
- Figures 22a, 22b and 22c show the clamp of the first embodiment once it is installed in a possible clamp-holder support and it runs along some profiles (here only one of the two profiles 32 is shown).
- the ring 1 1 can be manually rotated by the user acquiring the different desired angular positions, for example, pointing towards the left side in figure 22a, upwards in the following figure 22b or towards the right side in the last figure 22c.
- the piston diameter caliper 1 provides a clamping force of up to 180 decaNewtons (daN) for a working pressure of 6 bar.
- the fluid inlet and outlet intakes 15 are arranged on the rear face of the caliper. , see figure 27.
- the second fixed arm 3b does not present any extended surface, but, as shown in figure 25, is vertically aligned with the tips 2, 2b.
- Figures 23 to 28 show how the end part of the second fixed arm 3b comprises two grated surfaces 14 located in the two end parts.
- FIG. 28 A longitudinal section of the gripper 300 of the fourth embodiment, in the closed position, is illustrated in Figure 28.
- the fluid inlet and outlet intakes 15 are embedded in the rear part of the caliper 300, and more specifically in the rear shock absorbing element 29.
- the part 30 is the same as the clamp 1 of the first embodiment.
- the only structural change of the internal components of the cylinder 26 is an intermediate piece that has a different and simpler configuration than that of the clamp 1 of the first embodiment, since there is no ring.
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Abstract
The invention relates to an improved pneumatic clamp for a transfer stamping press or servo-press, wherein the clamp is of the type that holds a sheet or workpiece, near the edge thereof, by means of two clamping tips, separated from one other, and wherein said pneumatic clamp differs from known pneumatic clamps in that it can be assured with total reliability that the two clamping tips apply the same force to the sheet, which guarantees the perfect (i.e. non-slip) clamping of the sheet by the clamp during the operations in which the sheet is taken from a first station, transferred to the next station and left at the latter station.
Description
DESCRIPCION DESCRIPTION
PINZA NEUMÁTICA MEJORADA PARA PRENSA DE ESTAMPACIÓN CON SISTEMAENHANCED PNEUMATIC GRIPPER FOR STAMPING PRESS WITH SYSTEM
TRANSFER TRANSFER
La presente invención se refiere a una pinza neumática mejorada para una prensa o servoprensa de estampación con sistema transfer, en donde la pinza es del tipo de las que sujeta mediante dos puntas de sujeción, separadas entre sí, a una chapa o pieza de trabajo, cerca del borde de la pieza de trabajo, y en donde dicha pinza neumática se diferencia de las ya conocidas en que permite asegurar con una total fiabilidad que las dos puntas de sujeción aplican un mismo esfuerzo sobre la chapa, por lo que se consigue que la prensa transfer sea más fiable y productiva, entre otras ventajas que se describirán más adelante. The present invention refers to an improved pneumatic gripper for a stamping press or servo press with a transfer system, wherein the gripper is of the type that holds by means of two gripping tips, spaced apart, to a sheet or workpiece, close to the edge of the workpiece, and where said pneumatic gripper differs from those already known in that it allows to ensure with complete reliability that the two clamping points apply the same effort on the sheet, thus achieving that the transfer press is more reliable and productive, among other advantages that will be described later.
Antecedentes de la invención Background of the invention
Las prensas de estampación se emplean en la industria para dar forma a piezas metálicas, como, por ejemplo, las chapas conformadas que se emplean en la industria del automóvil. Estas prensas incluyen un sistema de posicionamiento y transferización automático de las chapas, habitualmente llamado“sistema transfer”, que permite el troquelado secuencial de una chapa a lo largo de una pluralidad de troqueles puestos en la prensa. Stamping presses are used in industry to shape metal parts, such as shaped sheets used in the automotive industry. These presses include an automatic sheet positioning and transfer system, commonly called a "transfer system", which allows the sequential punching of a sheet along a plurality of dies placed in the press.
El mencionado sistema de posicionamiento y transferización automatizado, en adelante llamado “sistema transfer”, incluye una pluralidad de pinzas neumáticas que están distribuidas a lo largo de un par de perfiles porta-pinzas situados sensiblemente paralelos entre sí y a ambos lados de los troqueles de estampación consecutivos de la prensa. Ambos perfiles porta-pinzas están acoplados a unas barras pertenecientes a la transfer de la prensa susceptibles de realizar un movimiento de vaivén en la dirección de avance de las chapas a estampar, de modo que un grupo de pinzas asociadas a un mismo troquel es capaz de sujetar una chapa a estampar, transferirla hacia el siguiente troquel, y retroceder hasta su troquel de origen, mientras se produce la operación de estampación de la chapa. Este proceso se va repitiendo con las subsiguientes chapas a estampar o troquelar. The aforementioned automated positioning and transfer system, hereinafter called "transfer system", includes a plurality of pneumatic grippers that are distributed along a pair of gripper-holder profiles located substantially parallel to each other and on both sides of the stamping dies. consecutive press releases. Both clamp-holder profiles are coupled to bars belonging to the transfer of the press capable of performing a back and forth movement in the direction of advance of the sheets to be stamped, so that a group of clamps associated with the same die is capable of hold a sheet to be stamped, transfer it to the next die, and go back to its original die, while the sheet stamping operation takes place. This process is repeated with the subsequent plates to be stamped or stamped.
Las mencionadas pinzas neumáticas para prensa de estampación con sistema transfer comprenden, generalmente, unos brazos de sujeción de la chapa a estampar y un cuerpo de soporte que está provisto de una cavidad interior donde se aloja un cilindro neumático. Este cilindro tiene la función de accionar un brazo de sujeción de la pinza que está unido
articulado al cuerpo de soporte. Cada una de las pinzas incluye unos tubos para alimentar el circuito neumático del cilindro y unos cables eléctricos que alimentan uno o varios sensores de presencia de la chapa a estampar. Estos brazos de sujeción de la pinza pueden ser de distinta tipología, por ejemplo, uno fijo y otro móvil o bien dos brazos móviles. The aforementioned pneumatic grippers for stamping press with transfer system generally comprise arms for clamping the sheet to be stamped and a support body that is provided with an internal cavity where a pneumatic cylinder is housed. This cylinder has the function of operating a clamping arm of the gripper that is attached articulated to the support body. Each of the clamps includes tubes to feed the pneumatic circuit of the cylinder and electrical cables that feed one or more sensors for the presence of the sheet to be stamped. These clamping arms can be of different types, for example, one fixed and one mobile, or two mobile arms.
En funcionamiento, todos los dispositivos de pinzas están sincronizados de manera que extraen de manera simultánea una pieza de trabajo de una estación de trabajo y transfieren la pieza de trabajo a la siguiente estación de trabajo. In operation, all gripper devices are synchronized so that they simultaneously remove a workpiece from one workstation and transfer the workpiece to the next workstation.
Los procesos de estampación con prensas que incluyen sistema transfer persiguen el aumento de la producción (es decir las piezas por minuto) a través del incremento de la velocidad de trabajo del sistema. Al incrementarse la velocidad de trabajo también se incrementa la aceleración y desaceleración del movimiento de transferencia de la pinza con la chapa sujeta. Sin embargo, se ha comprobado que, a mayor velocidad del sistema, mayor esfuerzo debe ejercer la pinza sobre la chapa a estampar para evitar que ésta se deslice o gire debido a la diferencia de esfuerzos en cada punto de sujeción durante el movimiento de transferización a la siguiente estación de trabajo (es decir al siguiente troquel). The stamping processes with presses that include a transfer system seek to increase production (that is, pieces per minute) by increasing the working speed of the system. As the working speed increases, the acceleration and deceleration of the transfer movement of the gripper with the clamped plate also increases. However, it has been found that the higher the speed of the system, the more effort the clamp must exert on the sheet to be stamped to prevent it from sliding or rotating due to the difference in forces at each clamping point during the transfer to the next workstation (i.e. to the next die).
Un primer problema que puede producirse al intentar incrementarse la velocidad de trabajo del proceso de transferencia de las piezas entre troqueles es la pérdida de agarre de una pieza de trabajo y que la pieza de trabajo se caiga. Otro problema que se puede ocurrir es el desliz (sin caerse) de la chapa sujetada por una o más pinzas, alterando todo el proceso de estampación y pudiendo desencadenar un accidente, que puede llegar a ser muy grave, por ejemplo, al colocar de modo desajustado la chapa en el siguiente troquel. Dicho incidente de posicionamiento defectuoso de la chapa en el siguiente troquel puede detener todo el proceso de estampación lo que repercute de forma muy negativa en el rendimiento del conjunto de toda la prensa (no solo el de esa estación de trabajo), y también puede llegar a dañar la propia estación de trabajo. A first problem that can occur when trying to increase the working speed of the transfer process of the parts between dies is the loss of grip of a workpiece and the workpiece falling off. Another problem that can occur is the sliding (without falling) of the sheet held by one or more clamps, altering the entire stamping process and can trigger an accident, which can be very serious, for example, when placing in a misadjusted the sheet in the next die. This incident of faulty positioning of the sheet in the next die can stop the entire stamping process, which has a very negative impact on the performance of the entire press (not only that of that work station), and can also reach to damage the workstation itself.
Esta problemática de una inadecuada sujeción de las chapas por parte de las pinzas se magnifica y se convierte aún en mucho más relevante cuando se emplean en prensas donde las chapas se encuentran en voladizo (es decir sujetas por un único lado y por el otro están libres), puesto que el esfuerzo de sujeción de la pinza aún debe ser mayor para poder contrarrestar el peso de la chapa. En el caso de procesos donde involucran chapas en voladizo se logra doblar la producción, puesto que se pueden estampar dos chapas enfrentadas entre sí a la vez, cada una sujetada por un lado. Por este motivo, la
estampación de chapas en voladizo aporta grandes ventajas para la industria, a la vez que supone un desafío para lograr diseñar pinzas de sujeción neumáticas capaces de sujetar óptimamente a dichas chapas. This problem of an inadequate clamping of the sheets by the clamps is magnified and becomes even more relevant when they are used in presses where the sheets are cantilevered (that is, they are held on one side and free on the other. ), since the clamping force of the clamp must still be greater to be able to counteract the weight of the sheet. In the case of processes involving cantilevered sheets, it is possible to double the production, since two sheets can be stamped facing each other at the same time, each one held on one side. For this reason, Cantilever sheet metal stamping provides great advantages for the industry, as well as being a challenge in designing pneumatic clamping pliers capable of optimally holding such sheets.
Se conoce, del mismo titular, el Modelo de Utilidad español ES1140856U que describe una pinza mejorada para prensa de estampación con sistema transfer. Sin embargo, esta pinza presenta el inconveniente de que, en la realización del brazo superior móvil provisto de dos puntas de sujeción separadas entre sí, dichas puntas de sujeción presentan un extremo libre en el cual se inserta una rótula perfilada que sobresale ligeramente por el extremo de dichas puntas y configurado para poder girar ligeramente y para hacer contacto con la superficie superior de la chapa. Este extremo libre perfilado (que es capaz de girar libremente unos 9o) presenta el inconveniente de que al existir dos puntas de sujeción separadas una cierta distancia se crea una pequeña desalineación indeseada de dichas puntas debido a que la posición vertical donde quedan montados los respectivos extremos inferiores de cada rótula perfilada no sea el exactamente la misma, lo cual no permite garantizar que se ejerza sobre la superficie superior de la chapa el mismo esfuerzo en cada punta. Además, se debe tener en cuenta que las chapas presentan, a veces, irregularidades y ligeras inclinaciones que dificultan aún más la tarea de sujeción de las puntas. The Spanish Utility Model ES1140856U is known from the same owner, which describes an improved gripper for stamping press with transfer system. However, this clamp has the drawback that, in the embodiment of the movable upper arm provided with two spaced apart clamping points, said clamping points have a free end into which a profiled ball joint is inserted that protrudes slightly at the end. of said tips and configured to be able to rotate slightly and to make contact with the upper surface of the sheet. This free profiled end (which is able to rotate freely about 9 ° ) has the drawback that when there are two clamping points separated by a certain distance, a small unwanted misalignment of said points is created due to the vertical position where the respective points are mounted. The lower ends of each profiled ball joint are not exactly the same, which does not guarantee that the same effort is exerted on the upper surface of the sheet at each point. In addition, it must be taken into account that the plates sometimes have irregularities and slight inclinations that make the task of clamping the tips even more difficult.
Esta desalineación entre las posiciones en el plano vertical de los dos extremos inferiores de cada punta inevitablemente provoca una indeterminación mecánica (que se traduce en que no se puede saber con total exactitud si las dos rótulas perfiladas de las puntas ejercen el mismo esfuerzo o no), lo que provoca fallos de sujeción de la pinza. This misalignment between the positions in the vertical plane of the two lower ends of each point inevitably causes mechanical indeterminacy (which means that it is not possible to know with complete accuracy whether the two profiled ball joints of the points exert the same effort or not) , which causes clamping failure of the caliper.
Por otra parte, la pinza descrita en el Modelo de Utilidad español ES1140856U presenta unas conexiones neumáticas y eléctricas dispuestas en una posición fija en el lateral del cuerpo de soporte, lo que en ocasiones dificulta el posicionamiento por parte del instalador de los tubos o cables en dichas conexiones en la operación de conexión de las mismas porque se debe buscar una posición concreta y a veces las conexiones neumáticos y/o cables eléctricas de alimentación del sensor de presencia de la chapa pueden quedar instalados doblados o bien en posiciones muy forzadas, pudiendo quedar estrangulados, lo que provoca una indeseada limitación del paso del aire. On the other hand, the clamp described in the Spanish Utility Model ES1140856U has pneumatic and electrical connections arranged in a fixed position on the side of the support body, which sometimes makes it difficult for the installer to position the pipes or cables in Said connections in the connection operation of the same because a specific position must be sought and sometimes the pneumatic connections and / or electrical cables feeding the plate presence sensor can be installed bent or in very forced positions, being able to be strangled , which causes an undesired limitation of the air passage.
Por otra parte, la pinza descrita en el Modelo de Utilidad español ES1 140856U presenta un brazo inferior fijo 3b sobre el que se apoya la superficie inferior de la chapa y que presenta una longitud corta, lo que no permite un óptimo apoyo de la superficie inferior de la chapa,
sobre todo en los casos en que la chapa se sujeta en voladizo (es decir únicamente por un solo lado). On the other hand, the clamp described in the Spanish Utility Model ES1 140856U has a fixed lower arm 3b on which the lower surface of the sheet rests and which has a short length, which does not allow an optimal support of the lower surface of the sheet, especially in cases where the sheet is supported cantilevered (that is, only on one side).
Además, la pinza descrita en el Modelo de Utilidad español ES1140856U presenta un cuerpo de soporte 4 que es caro de fabricar. Furthermore, the clamp described in the Spanish Utility Model ES1140856U has a support body 4 that is expensive to manufacture.
A la vista de lo expuesto anteriormente, resulta clara la necesidad de obtener unas pinzas neumáticas para prensas de estampación con sistema transfer capaces de ejercer un esfuerzo igual por cada punta de sujeción sobre la chapa a estampar, para poder asegurar una total fiabilidad en cuanto a la perfecta sujeción de la chapa durante las operaciones de coger la chapa, transferirla a la siguiente estación de trabajo y dejarla en dicha siguiente estación (incluso cuando estas operaciones se realizan a elevadas aceleraciones), y con ello poder incrementar la velocidad de la prensa (ciclos por minuto) y conseguir un incremento de la producción (chapas por minuto). In view of the above, it is clear the need to obtain pneumatic grippers for stamping presses with transfer system capable of exerting an equal force for each clamping point on the sheet to stamp, in order to ensure total reliability in terms of the perfect clamping of the sheet during the operations of picking up the sheet, transferring it to the next work station and leaving it at said next station (even when these operations are carried out at high accelerations), and thus being able to increase the speed of the press ( cycles per minute) and achieve an increase in production (sheets per minute).
Descripción de la invención Description of the invention
El objetivo de la presente invención es el de proporcionar una pinza neumática mejorada para una prensa o servoprensa de estampación con sistema transfer, en donde la pinza sujeta mediante dos puntas de sujeción separadas entre sí a una chapa o pieza de trabajo, que permite asegurar que las dos puntas de sujeción aplican un mismo esfuerzo sobre la chapa, entre otras ventajas que se describirán más adelante. The aim of the present invention is to provide an improved pneumatic gripper for a stamping press or servo press with a transfer system, wherein the gripper is held by two separate clamping tips to a sheet or workpiece, which makes it possible to ensure that the two clamping points apply the same effort on the sheet, among other advantages that will be described later.
De modo preferente, aunque no limitativo, esta pinza de la invención está destinada para sujetar a chapas o piezas de trabajo dispuestas en voladizo, es decir que una o más pinzas sujetan a una chapa o pieza de trabajo, pero solamente por uno de sus lados. No obstante, la pinza de la invención también se podrá usar satisfactoriamente para sujetar a una chapa o pieza de trabajo por ambos lados, es decir proveyendo al menos una pinza en cada lado de la chapa, para así otorgar mayor estabilidad de sujeción. Preferably, although not limiting, this clamp of the invention is intended to hold sheets or workpieces arranged in a cantilever, that is, one or more clamps hold a sheet or workpiece, but only on one of its sides. . However, the clamp of the invention can also be used satisfactorily to clamp a sheet or workpiece on both sides, that is to say by providing at least one clamp on each side of the sheet, in order to provide greater clamping stability.
De acuerdo con este objetivo, según un primer aspecto, la presente invención proporciona una pinza neumática que comprende un primer brazo y un segundo brazo entre los cuales se sujeta la chapa o pieza a estampar y también comprende un cuerpo de soporte que está provisto, como mínimo, de una cavidad interior donde se aloja un cilindro fluido-dinámico de accionamiento del primer brazo, siendo susceptible dicho cilindro de accionar el primer brazo de sujeción de la pinza que está unido articulado a dicho cuerpo de soporte.
A diferencia de las pinzas neumáticas del estado de la técnica, como mínimo el primer brazo de sujeción articulado de la pinza de la invención comprende los siguientes elementos: According to this objective, according to a first aspect, the present invention provides a pneumatic gripper comprising a first arm and a second arm between which the sheet or part to be stamped is clamped and also comprises a support body that is provided, as minimum, of an interior cavity where a fluid-dynamic cylinder for actuating the first arm is housed, said cylinder being capable of actuating the first clamping arm of the gripper which is articulated to said support body. Unlike the pneumatic grippers of the state of the art, at least the first articulated clamping arm of the gripper of the invention comprises the following elements:
un elemento brazo, cuyo cuerpo se extiende en dirección de un eje longitudinal Y-Y’; un brazo de compensación fijado de modo basculante al extremo frontal del elemento brazo, donde el brazo de compensación está dispuesto transversalmente al eje Y-Y’, y donde dicho brazo de compensación comprende dos orificios pasantes separados entre sí una cierta distancia, equidistante del eje Y-Y’, uno en cada extremo del brazo de compensación, configurados para recibir en su interior a cada punta de sujeción, y en donde dicho brazo de compensación y el elemento brazo están unidos por medio de unos medios de basculación configurados de modo que el brazo de compensación puede bascular ligeramente de un eje X-X’ transversal al eje Y-Y’; y respectivas puntas de sujeción dispuestas en el interior de cada orificio pasante del brazo de compensación, provista cada punta de sujeción de un sistema de fijación, tal como una tuerca o elemento similar, configurado para fijar cada punta al brazo de compensación. an arm element, whose body extends in the direction of a longitudinal axis Y-Y '; a compensation arm fixed in a swingable way to the front end of the arm element, where the compensation arm is arranged transversely to the Y-Y 'axis, and where said compensation arm comprises two through holes spaced a certain distance from each other, equidistant from the axis Y-Y ', one at each end of the compensation arm, configured to receive each clamping point inside, and wherein said compensation arm and the arm element are joined by means of tilting means configured so that the compensation arm can swing slightly from an X-X 'axis transverse to the Y-Y' axis; and respective clamping points arranged inside each through hole of the compensation arm, each clamping point provided with a fixing system, such as a nut or the like, configured to fix each point to the compensation arm.
De modo preferente, las puntas de sujeción comprenden una respectiva rótula provista de una superficie exterior perfilada que sobresale ligeramente por debajo de sus extremos inferiores. De esta manera, se mejora sustancialmente el agarre de las puntas a la superficie superior de la pieza de trabajo. Preferably, the clamping tips comprise a respective ball joint provided with a contoured outer surface that protrudes slightly below its lower ends. In this way, the grip of the tips to the upper surface of the workpiece is substantially improved.
Gracias a esta leve basculación del brazo de basculación, se consigue que las dos puntas de sujeción sean capaces de apoyar perfectamente por sus respectivos extremos inferiores perfilados sobre la superficie superior irregular de cada chapa de trabajo distinta ejerciendo un mismo esfuerzo por cada punta, motivo por el cual se obtiene una pinza de mayor calidad capaz de sujetar de forma mucho más segura la pieza de trabajo a estampar, lo que se traduce en un la posibilidad de acelerar el desplazamiento del sistema transfer de manera segura y, con ello, incrementar la productividad de la prensa. Thanks to this slight tilting of the tilting arm, it is achieved that the two clamping points are able to support perfectly by their respective lower profiled ends on the irregular upper surface of each different work plate, exerting the same effort on each point, which is why which results in a higher quality gripper capable of holding the workpiece to be stamped much more securely, which translates into the possibility of safely accelerating the transfer system movement and, thus, increasing productivity from the press.
La pinza de la presente invención, además de proporcionar una mayor capacidad de sujeción, que es su principal objetivo, proporciona otras ventajas que se describen seguidamente. The clamp of the present invention, in addition to providing a greater holding capacity, which is its main objective, provides other advantages that are described below.
La pinza de la invención puede ser del tipo de las que el primer brazo es un brazo móvil que está unido articuladamente al cuerpo de soporte y el segundo brazo es un brazo fijo de
sujeción que queda integrado en el cuerpo de soporte extendiéndose hacia adelante. The gripper of the invention can be of the type in which the first arm is a mobile arm that is hingedly connected to the support body and the second arm is a fixed arm of support that is integrated into the support body extending forward.
Alternativamente, la pinza de la presente invención también puede ser del tipo de las que tanto el primer brazo como el segundo brazo son respectivos brazos móviles que están unidos de modo articulado a dicho cuerpo de soporte. En este segundo caso, uno o ambos brazos móviles podrían disponer del sistema con brazo basculante objeto de la presente invención. Alternatively, the gripper of the present invention can also be of the type in which both the first arm and the second arm are respective movable arms that are hingedly attached to said support body. In this second case, one or both of the mobile arms could have the tilting arm system that is the object of the present invention.
De modo preferente, el primer brazo de sujeción es del tipo de los que comprende en el extremo opuesto al brazo basculante del primer brazo de sujeción una ranura que sirve de guía para un rodamiento actuador, que está unido solidariamente al vástago del cilindro de accionamiento del primer brazo. Sin embargo, también se puede utilizar un casquillo actuador (por ejemplo, casquillo de acero tratado) en sustitución del rodamiento. El rodamiento tiene la ventaja respecto al casquillo de que el esfuerzo de sujeción de la pinza se incrementa sustancialmente (alrededor de un 290%). Estas dos soluciones (rodamiento y casquillo actuador) son ya conocidas en el mercado. Preferably, the first clamping arm is of the type that comprises at the end opposite the pivoting arm of the first clamping arm a groove that serves as a guide for an actuator bearing, which is integrally connected to the rod of the actuating cylinder of the first arm. However, an actuator bushing (eg treated steel bushing) can also be used as a replacement for the bearing. The bearing has the advantage over the bushing that the clamping force of the caliper is increased substantially (around 290%). These two solutions (bearing and actuator bushing) are already known on the market.
Según una realización preferente de la invención, el primer brazo de sujeción comprende los siguientes elementos: According to a preferred embodiment of the invention, the first clamping arm comprises the following elements:
• un elemento brazo con un extremo frontal que presenta dos paredes laterales planas, y además el elemento brazo presenta un orificio longitudinal en su superficie frontal con un diámetro y profundidad tal para albergar a una parte de un eje interior; • an arm element with a front end that has two flat side walls, and furthermore the arm element has a longitudinal hole in its front surface with a diameter and depth such to house a part of an inner shaft;
• un brazo de compensación provisto en su superficie posterior de un orificio central que se extiende en dirección longitudinal X-X’ al cuerpo del brazo de compensación con un diámetro y profundidad tal para albergar a una parte del eje interior y provisto también en esta superficie posterior de un rebaje que define una superficie de encaje con al menos dos paredes laterales planas y donde la distancia entre dichas paredes planas es ligeramente superior a la distancia entre las dos superficies laterales planas del elemento brazo, de modo que el extremo frontal del elemento brazo queda perfectamente encajado en esta superficie de encaje pero con un ligero juego de basculación (con un ángulo de giro comprendido entre 0 y 10° del brazo de compensación respecto al eje longitudinal Y-Y’ del elemento brazo), y además el brazo de compensación comprende dos orificios laterales pasantes separados entre sí una cierta distancia, equidistante del eje de rotación, uno en cada extremo del brazo de compensación, para recibir en su interior a cada punta de sujeción;
• respectivas puntas de sujeción dispuestas en el interior de cada orificio pasante del brazo de compensación, provistas cada punta de sujeción de una tuerca para fijarlas al brazo de compensación y provistas de una rótula perfilada que sobresale ligeramente de sus extremos inferiores; y • a compensation arm provided on its rear surface with a central hole extending in the longitudinal direction XX 'to the body of the compensation arm with a diameter and depth such to house a part of the inner shaft and also provided on this rear surface with a recess that defines an engaging surface with at least two flat side walls and where the distance between said flat walls is slightly greater than the distance between the two flat side surfaces of the arm element, so that the front end of the arm element is perfectly embedded in this engagement surface but with a slight tilt play (with a rotation angle between 0 and 10 ° of the compensation arm with respect to the longitudinal axis YY 'of the arm element), and furthermore the compensation arm includes two lateral holes through holes spaced a certain distance, equidistant from the axis of rotation, one at each end of the c-arm compensation, to receive each clamping point inside; • respective clamping points arranged inside each through hole of the compensation arm, each clamping point provided with a nut to fix them to the compensation arm and provided with a profiled ball joint slightly protruding from their lower ends; Y
• el eje interior dispuesto en el interior de ambos orificios del brazo de compensación y del elemento brazo, de modo que a través del eje interior quedan unidos el brazo de compensación y el elemento brazo y a la vez este eje interior permite el ligero giro de una de las dos piezas entorno a dicho eje interior. • the inner axis arranged inside both holes of the compensation arm and the arm element, so that the compensation arm and the arm element are joined through the inner axis and at the same time this inner axis allows a slight rotation of a of the two pieces around said inner shaft.
De modo preferente, el eje interior queda fijado mediante una tuerca con una prolongación posterior que queda dispuesta en el interior del extremo frontal del eje y al quedar montado hace tope con la cara frontal del brazo de compensación. Preferably, the inner shaft is fixed by means of a nut with a rear extension that is arranged inside the front end of the shaft and when mounted it abuts the front face of the compensating arm.
De modo preferente, la rótula perfilada insertada en cada extremo inferior de las puntas de sujeción está configurada con unas dimensiones tales para posibilitar su giro de ángulo máximo de 9o. So preferably the patella profiled lower end inserted in each of the fastening points is configured with such dimensions to enable rotation of maximum angle of 9 or.
De modo preferente, el brazo de compensación presenta una distancia entre los dos orificios para las puntas comprendida entre 19 y 70 mm, por ejemplo, de 20 mm o 50 mm. Cuanto mayor sea esta distancia entre puntas mayor será la estabilidad de la sujeción de la chapa. Preferably, the compensation arm has a distance between the two tip holes of between 19 and 70 mm, for example 20 mm or 50 mm. The greater this distance between points, the greater the stability of the plate clamping.
De modo preferente, el segundo brazo de sujeción comprende una superficie extendida que se extiende hacia delante más allá del plano vertical donde están dispuestas las puntas de sujeción de la pieza. La provisión de esta superficie extendida permite que la chapa quede convenientemente apoyada sobre dicha superficie extendida, por lo que se mejora sustancialmente la sujeción de la chapa. A modo de ejemplo, la superficie extendida se extiende hacia delante una longitud comprendida entre 12 y 60 mm. Preferably, the second clamping arm comprises an extended surface that extends forwardly beyond the vertical plane where the clamping tips of the part are disposed. The provision of this extended surface enables the sheet to be conveniently supported on said extended surface, thereby substantially improving the holding of the sheet. By way of example, the extended surface extends forward a length between 12 and 60 mm.
De modo preferente, el segundo brazo de sujeción comprende, en dicha superficie extendida, una superficie ranurada en como mínimo cada zona donde apoyan las puntas, y en donde esta(s) superficie(s) rallada(s) comprende(n) unas ranuras o surcos que se extienden en dirección transversal al eje longitudinal Y-Y’ del cuerpo de soporte (es decir que se extienden en dirección del avance de la transfer). De modo preferente, una superficie ranurada en la zona donde apoya una punta ocupa una zona como mínimo igual a la superficie de la parte inferior de la punta.
Según un modo de realización de la invención, puede proveerse una superficie ranurada en cada zona donde apoyan las puntas, o bien una única superficie ranurada para ambas puntas que se extiende transversalmente. Según un modo de realización de la invención, esta superficie ranurada presenta unas ranuras regulares de igual profundidad que se extienden hacia abajo y que presentan una sección preferentemente trapezoidal o bien triangular. Preferably, the second clamping arm comprises, on said extended surface, a grooved surface in at least each zone where the tips rest, and where this (s) grated surface (s) comprise (s) grooves or grooves that extend in a direction transverse to the longitudinal axis YY 'of the support body (that is, they extend in the direction of advancement of the transfer). Preferably, a grooved surface in the area where a tip rests occupies an area at least equal to the area of the lower part of the tip. According to an embodiment of the invention, a grooved surface can be provided in each area where the tips rest, or else a single grooved surface for both tips extending transversely. According to one embodiment of the invention, this grooved surface has regular grooves of equal depth that extend downward and that have a preferably trapezoidal or triangular section.
El solicitante ha llevado a cabo, entre otras, las siguientes tres pruebas empíricas que constatan que la retención lateral necesaria para hacer deslizar o girar la chapa que se encuentra sujeta por la pinza de la invención en posición cerrada puede augmentar hasta un 423,5% respecto a las pinzas ya conocidas en el mercado: The applicant has carried out, among others, the following three empirical tests that verify that the lateral retention necessary to make the sheet slide or rotate that is held by the clamp of the invention in the closed position can increase up to 423.5% compared to the clamps already known on the market:
Este gran aumento, de hasta un 241 ,3%, de la retención lateral necesaria para hacer
deslizar o girar la chapa sujeta por la pinza de la invención en posición cerrada respecto a las pinzas ya conocidas en el mercado es realmente sorprendente e inesperado. This large increase, of up to 241.3%, in the lateral retention needed to make sliding or rotating the sheet held by the clamp of the invention in a closed position with respect to the clamps already known on the market is really surprising and unexpected.
Opcionalmente, la pinza de la invención puede comprender, a diferencia de las pinzas convencionales, un anillo rotable que queda sujeto exteriormente en una posición concreta del cuerpo de soporte, pero con posibilidad de rotar (preferentemente totalmente) alrededor del cuerpo de soporte, en donde el anillo rotable comprende unas tomas de entrada y salida de fluido, y en donde el anillo está configurado para ser acoplable exteriormente a una parte exterior del cuerpo soporte. Preferentemente, el anillo rotable comprende, además, un canal para pasar las conexiones eléctricas del sensor de presencia de la chapa. Este anillo permite facilitar la inserción de las tomas de entrada y salida de fluido y del cableado eléctrico, es decir ganar en versatilidad de posicionamiento de las unas tomas de entrada y salida de fluido y de las conexiones eléctricas, al poder rotar el anillo 360° entorno al cuerpo de soporte, según convenga en cada caso. Ello se traduce en una disminución del tiempo de montaje de las tomas de entrada y salida de fluido y de las conexiones eléctricas por parte del instalador y también en una reducción de los errores de montaje y posibles problemas de alimentación de fluido a la pinza debido a la disposición de conexiones o cables doblados o en posiciones forzadas. Por lo tanto, la provisión del anillo redunda en un augmento de la productividad. Optionally, the clamp of the invention can comprise, unlike conventional clamps, a rotatable ring that is externally held in a specific position on the support body, but with the possibility of rotating (preferably totally) around the support body, where the rotatable ring comprises fluid inlet and outlet intakes, and wherein the ring is configured to be externally coupleable to an external part of the support body. Preferably, the rotatable ring also comprises a channel for passing the electrical connections of the sheet metal presence sensor. This ring allows to facilitate the insertion of the fluid inlet and outlet sockets and electrical wiring, that is to say, to gain in versatility in positioning the fluid inlet and outlet sockets and the electrical connections, as the ring can be rotated 360 ° around the support body, as appropriate in each case. This translates into a reduction in the installation time of the fluid inlet and outlet ports and the electrical connections by the installer and also in a reduction in assembly errors and possible problems with the supply of fluid to the clamp due to the arrangement of bent or strained connections or cables. Therefore, the provision of the ring results in an increase in productivity.
Para poder acoplar el anillo, la pinza mejorada de la invención presenta, preferentemente, una porción posterior del cuerpo de soporte que presenta una superficie ranurada que facilita el acople del anillo rotable sin que pueda extraerse, pero sí rotar. Esta superficie ranurada presenta una pluralidad de ranuras en distintos puntos de la longitud del cuerpo de soporte y cuya finalidad es la de insertar en las mismas respectivas juntas tóricas para canalizar las conducciones de aire y además para ayudar a la sujeción del anillo en la posición concreta de trabajo, y con posibilidad de giro. Para poder asegurar que el anillo no pueda extraerse ni moverse en dirección longitudinal de su posición de trabajo, la porción del cuerpo de soporte puede comprender una aleta de no-retorno que evite la extracción del anillo por parte del usuario. In order to be able to engage the ring, the improved clamp of the invention preferably has a rear portion of the support body that has a grooved surface that facilitates the engagement of the rotatable ring without being removable, but rotatable. This grooved surface has a plurality of grooves at different points along the length of the support body and the purpose of which is to insert in them respective O-rings to channel the air conduits and also to help hold the ring in the specific position. working, and with the possibility of turning. In order to ensure that the ring cannot be removed or moved in the longitudinal direction from its working position, the portion of the support body may comprise a non-return flap that prevents removal of the ring by the user.
Alternativamente a la realización comentada en los dos últimos párrafos de disponer de las dos tomas de entrada y salida de fluido en un anillo rotable, también se pueden disponer las dos tomas de entrada y salida de fluido, de modo fijo, saliendo de la cara posterior del cuerpo soporte, preferentemente insertadas inamovibles en el elemento amortiguador que actúa de tope para el pistón del cilindro. Esta segunda realización sin anillo tiene asociado
un coste más económico en comparación con la realización anterior con anillo al tener una pieza menos -el anillo-, aunque, por el contrario, puede conllevar una largaria de la pinza más las tomas algo superior que la solución con anillo. As an alternative to the embodiment discussed in the last two paragraphs of having the two fluid inlet and outlet intakes in a rotatable ring, the two fluid inlet and outlet intakes can also be arranged, in a fixed way, leaving the rear face of the support body, preferably inserted immovably in the damping element that acts as a stop for the cylinder piston. This second embodiment without ring has associated a more economical cost compared to the previous embodiment with a ring as it has one less piece -the ring-, although, on the contrary, it may entail a length of the clamp plus the intakes that is somewhat higher than the solution with a ring.
De modo general, cuando no existen problemas de espacio se dispondrá de las tomas de entrada y salida de fluido en la parte trasera de la pinza, y cuando en aquellos casos en los que exista escaso espacio para poder albergarlas en la parte trasera se dispondrán dichas tomas en la parte lateral. In general, when there are no space problems, the fluid inlet and outlet intakes will be available at the rear of the caliper, and when in those cases where there is little space to house them at the rear, such shots on the side.
Preferentemente, la pinza mejorada de la invención presenta un extremo posterior configurado para ser fijado por cualquier medio mecánico conocido a una pieza porta- pinzas. Preferably, the improved clamp of the invention has a rear end configured to be fixed by any known mechanical means to a clamp-holder part.
Por otra parte, y de modo opcional, el cuerpo de soporte de la pinza mejorada de la invención presenta, al menos una parte exterior, en forma sustancialmente cilindrica. Ello se traduce en que el coste de fabricación del cuerpo de soporte se reduce notablemente, al ser mucho más fácil de mecanizar que una pieza prismática, a la vez que se requiere la utilización de menos cantidad de material, por lo que en definitiva el coste total de fabricación del cuerpo de soporte disminuye. De modo preferente, tanto la parte posterior del cuerpo de soporte como la parte delantera presentan una parte exterior sustancialmente cilindrica. On the other hand, and optionally, the support body of the improved caliper of the invention has, at least one outer part, substantially cylindrical in shape. This means that the manufacturing cost of the support body is significantly reduced, as it is much easier to machine than a prismatic part, while the use of less material is required, so ultimately the cost Total manufacturing of the support body decreases. Preferably, both the rear part of the support body and the front part have a substantially cylindrical outer part.
Ventajosamente, el primer brazo de sujeción está unido articuladamente al cuerpo de soporte de la pinza en un punto de articulación que está dispuesto sustancialmente alineado con el segundo brazo de sujeción. De este modo, pueden emplearse puntas de sujeción más cortas, lo que contribuye a reducir el peso total del brazo. Advantageously, the first clamping arm is hingedly connected to the support body of the gripper at an articulation point which is arranged substantially aligned with the second clamping arm. In this way, shorter clamping tips can be used, helping to reduce the overall weight of the arm.
Preferentemente, la pinza mejorada de la invención comprende una ranura colisa que sirve de guía para un rodamiento actuador que está unido solidario al vástago del cilindro de accionamiento de dicho brazo articulado. El titular de la presente invención ha observado que este rodamiento actuador contribuye a alargar la vida útil de la pinza. Preferably, the improved gripper of the invention comprises a collised groove that serves as a guide for an actuator bearing that is integral with the rod of the actuating cylinder of said articulated arm. The holder of the present invention has observed that this actuator bearing contributes to lengthening the useful life of the caliper.
En relación al cuerpo de soporte, según una realización preferida, la cámara trasera del cilindro para la entrada y salida de fluido puede comprender un elemento amortiguador que actúa de tope para el pistón del cilindro, estando dimensionado dicho elemento amortiguador para absorber energía cinética procedente del movimiento del primer brazo
articulado de sujeción de la pinza y contribuye a obtener una velocidad del brazo superior. La provisión de este elemento amortiguador permite, ventajosamente, reducir de forma muy significativa el ruido que hace la pinza mientras trabaja, lo que permite mejorar las condiciones ambientales del lugar de trabajo. In relation to the support body, according to a preferred embodiment, the rear chamber of the cylinder for the inlet and outlet of fluid can comprise a damping element that acts as a stop for the cylinder piston, said damping element being dimensioned to absorb kinetic energy from the movement of the first arm articulated caliper clamping and contributes to higher arm speed. The provision of this damping element allows, advantageously, to reduce very significantly the noise made by the gripper while working, which allows improving the environmental conditions of the workplace.
Ventajosamente, la pinza puede comprender un sensor de presencia de la pieza a estampar que incluye un cable de alimentación de dicho sensor integrado en la porción del cuerpo de soporte que define el segundo brazo. Esta característica contribuye a reducir la altura total de la pinza, lo que permite ganar espacio. Advantageously, the clamp can comprise a sensor for the presence of the piece to be stamped that includes a supply cable for said sensor integrated in the portion of the support body that defines the second arm. This feature helps reduce the overall height of the gripper, thus saving space.
Dicho cilindro fluido-dinámico es un cilindro fluido neumático de diámetro superior a 20 mm, por ejemplo, un diámetro de 25 mm o 32 mm, lo que contribuye a obtener una pinza con una mayor fuerza de sujeción. Said fluid-dynamic cylinder is a pneumatic fluid cylinder with a diameter greater than 20 mm, for example, a diameter of 25 mm or 32 mm, which contributes to obtaining a gripper with a greater clamping force.
Según una realización preferida, preferiblemente, la pinza comprende dos tomas de entrada y salida para el fluido de alimentación del cilindro fluido-dinámico (por ejemplo, neumático), que están dispuestas, de modo preferente, en el anillo. According to a preferred embodiment, preferably, the gripper comprises two inlet and outlet ports for the supply fluid of the fluid-dynamic cylinder (for example pneumatic), which are preferably arranged in the ring.
Gracias a las características mencionadas con anterioridad, se obtiene una pinza mejorada de diseño simple y compacto que presenta las siguientes ventajas respecto de las pinzas del estado de la técnica: Thanks to the aforementioned characteristics, an improved clamp with a simple and compact design is obtained that has the following advantages compared to the clamps of the state of the art:
• Su retención lateral para hacer deslizar o girar la chapa sujeta por la pinza de la invención es un 423,5% superior. • Its lateral retention to slide or rotate the sheet held by the clamp of the invention is 423.5% higher.
• Mayor seguridad de sujeción, es decir reducción de fallos de sujeción. • Greater clamping security, that is, reduction of clamping failures.
• El cuerpo de soporte tiene un 16% menos de peso. • The support body has 16% less weight.
• Menor tiempo y coste de fabricación del cuerpo de soporte. • Less time and cost to manufacture the support body.
• Mayor versatilidad en cuanto al posicionamiento de las conexiones neumáticas y eléctricas de la pinza. • Greater versatility regarding the positioning of the pneumatic and electrical connections of the gripper.
Todas estas ventajas redundan en una mayor retención lateral a la vez que dicha sujeción es más fiable, de modo que se incrementa de manera muy significativa la productividad y fiabilidad de la prensa de estampación. All these advantages result in greater lateral retention while said clamping is more reliable, so that the productivity and reliability of the stamping press is significantly increased.
Breve descripción de las figuras
Para mejor comprensión de cuanto se ha expuesto se acompañan unos dibujos en los que, esquemáticamente y tan sólo a título de ejemplo no limitativo, se representa unos casos prácticos de realización. Brief description of the figures For a better understanding of what has been explained, some drawings are attached in which, schematically and only as a non-limiting example, some practical cases of realization are represented.
Las figuras 1 a 8 son dibujos que representan una primera realización de la pinza de dos puntas de sujeción objeto de la presente invención. En concreto: Figures 1 to 8 are drawings representing a first embodiment of the two-prong clamp object of the present invention. Specific:
• Las figuras 1 y 2 muestran vistas en perspectiva de la primera realización de la pinza de dos puntas de sujeción objeto de la presente invención, en posición cerrada y abierta, respectivamente. • Figures 1 and 2 show perspective views of the first embodiment of the two-prong clamp object of the present invention, in the closed and open position, respectively.
• La figura 3 muestra una vista en alzado lateral de la primera realización de la pinza de dos puntas de sujeción objeto de la presente invención, en posición cerrada. • Figure 3 shows a side elevation view of the first embodiment of the two-prong clamp object of the present invention, in the closed position.
• La figura 4 muestra una vista en planta superior de la pinza de las figuras anteriores 1 a 3, en posición cerrada. • Figure 4 shows a top plan view of the clamp of previous figures 1 to 3, in the closed position.
• Las figuras 5 y 6 muestran vistas en alzado frontal y posterior de la pinza de las figuras anteriores 1 a 4, respectivamente, en posición cerrada. • Figures 5 and 6 show front and rear elevation views of the clamp of previous Figures 1 to 4, respectively, in the closed position.
• Las figuras 7 y 8 muestran secciones longitudinales de la pinza de las figuras anteriores 1 a 6, en posición cerrada y abierta, respectivamente. • Figures 7 and 8 show longitudinal sections of the clamp of previous figures 1 to 6, in closed and open position, respectively.
Las figuras 9 a 15 son dibujos que representan una segunda realización de la pinza de dos puntas de sujeción objeto de la presente invención. En concreto: Figures 9 to 15 are drawings showing a second embodiment of the two-prong clamp object of the present invention. Specific:
• Las figuras 9 y 10 muestran vistas en perspectiva de la segunda realización de la pinza de dos puntas de sujeción objeto de la presente invención (en este caso con una distancia entre puntas superior a la primera realización), en posición cerrada y abierta, respectivamente. • Figures 9 and 10 show perspective views of the second embodiment of the two-prong clamp object of the present invention (in this case with a distance between prongs greater than the first embodiment), in the closed and open position, respectively. .
• La figura 11 muestra una vista en planta superior de la segunda realización de la pinza, en posición cerrada. • Figure 11 shows a top plan view of the second embodiment of the clamp, in the closed position.
• Las figuras 12 y 13 muestran vistas en alzado frontal y posterior de la segunda realización de la pinza, respectivamente, en posición cerrada.
• Las figuras 14 y 15 muestran secciones longitudinales de la segunda realización de la pinza, en posición cerrada y abierta, respectivamente. • Figures 12 and 13 show front and rear elevation views of the second embodiment of the clamp, respectively, in the closed position. • Figures 14 and 15 show longitudinal sections of the second embodiment of the clamp, in closed and open position, respectively.
Las figuras 16 a 19 son dibujos que representan al primer brazo de sujeción de la primera realización de la pinza de dos puntas de sujeción objeto de la presente invención, en donde: Figures 16 to 19 are drawings representing the first clamping arm of the first embodiment of the two-prong clamp object of the present invention, where:
• La figura 16 muestra una vista en perspectiva de dicho primer brazo de sujeción montado. • Figure 16 shows a perspective view of said first assembled clamping arm.
• La figura 17 muestra una vista en perspectiva explosionada del dicho primer brazo de sujeción. • Figure 17 shows an exploded perspective view of said first clamping arm.
• Las figuras 18 y 19 muestran vistas en dos perspectivas distintas del brazo basculante de dicho primer brazo de sujeción. • Figures 18 and 19 show views in two different perspectives of the rocker arm of said first clamping arm.
La figura 20 muestra la misma figura en alzado frontal de la pinza de la segunda realización, en donde se ha representado el pequeño juego existente de ángulo de giro cq entre el brazo basculante y el elemento brazo. Figure 20 shows the same figure in front elevation of the gripper of the second embodiment, where the small existing play of rotation angle cq between the rocker arm and the arm element has been represented.
La figura 21 muestra una vista en perspectiva de una tercera realización de la pinza de dos puntas de sujeción objeto de la presente invención, en posición cerrada, similar a la segunda realización, pero en este caso en donde la superficie ranurada del segundo brazo fijo ocupa toda la superficie extendida. En esta figura 21 se han representado 3 detalles distintos: el detalle 1 que hace referencia a la superficie ranurada, el detalle 2 que hace referencia al extremo inferior de la punta provista de una esfera (que se llama en la jerga del sector como rótula) que está perfilada para proporcionar un rozamiento con la superficie de la chapa (no mostrada), y por último el detalle 3 que hace referencia al perfil en forma de zigzag de la superficie ranurada. En el detalle 2 se muestra como la punta está formada por un tornillo 21 provisto de un orificio inferior en donde se inserta la rótula perfilada 22. Figure 21 shows a perspective view of a third embodiment of the two-prong clamp object of the present invention, in the closed position, similar to the second embodiment, but in this case where the grooved surface of the second fixed arm occupies the entire extended surface. In this figure 21 3 different details have been represented: detail 1 that refers to the grooved surface, detail 2 that refers to the lower end of the tip provided with a sphere (which is called in the jargon of the sector as a ball joint) which is profiled to provide friction with the surface of the sheet (not shown), and finally detail 3 which refers to the zigzag shaped profile of the grooved surface. In detail 2 it is shown how the tip is formed by a screw 21 provided with a lower hole where the profiled ball joint 22 is inserted.
Las figuras 22a, 22b y 22c muestran la disposición de la pinza de la primera realización una vez está instalada en un soporte porta-pinzas y el mismo discurre a lo largo de un perfil. Figures 22a, 22b and 22c show the arrangement of the clamp of the first embodiment once it is installed in a clamp-holder support and it runs along a profile.
Y las figuras 23 a 28 son dibujos que representan una cuarta realización de la pinza de dos puntas de sujeción objeto de la presente invención, similar a la primera realización, pero en
este caso no hay anillo y las tomas de aire están dispuestas en la cara posterior de la pinza y en donde el segundo brazo fijo no presenta ninguna superficie extendida, en donde: And figures 23 to 28 are drawings that represent a fourth embodiment of the two-prong clamp object of the present invention, similar to the first embodiment, but in in this case there is no ring and the air intakes are arranged on the rear face of the caliper and where the second fixed arm does not have any extended surface, where:
• Las figuras 23 y 24 muestran vistas en perspectiva de la cuarta realización de la pinza de dos puntas de sujeción objeto de la presente invención, en posición cerrada y abierta, respectivamente. • Figures 23 and 24 show perspective views of the fourth embodiment of the two-prong clamp object of the present invention, in the closed and open position, respectively.
• La figura 25 muestra una vista en alzado lateral de la cuarta realización de la pinza de dos puntas de sujeción objeto de la presente invención, en posición cerrada. • Figure 25 shows a side elevation view of the fourth embodiment of the two-prong clamp object of the present invention, in the closed position.
• La figura 26 muestra una vista en planta superior de la pinza de las figuras anteriores 23 a 25, en posición cerrada. • Figure 26 shows a top plan view of the clamp of previous figures 23 to 25, in the closed position.
• La figura 27 muestra una vista en alzado posterior de la cuarta realización de la pinza en posición cerrada. • Figure 27 shows a rear elevation view of the fourth embodiment of the clamp in the closed position.
• La figura 28 muestra una sección longitudinal de la pinza de la cuarta realización, en posición cerrada. • Figure 28 shows a longitudinal section of the gripper of the fourth embodiment, in the closed position.
Descripción de unas realizaciones preferidas de la invención Description of preferred embodiments of the invention
A continuación, se describen varias realizaciones distintas de la pinza neumática 1 , 100, 200, 300 para una prensa o servoprensa de estampación con sistema transfer de la presente invención, haciendo referencia a las figuras adjuntas 1 a 28. Several different embodiments of the pneumatic gripper 1, 100, 200, 300 for a press or servo press with transfer system of the present invention are described below with reference to the accompanying figures 1 to 28.
En todas las realizaciones mostradas en las figuras adjuntas, la pinza neumática 1 , 100, 200, 300 incluye dos brazos 3a, 3b de sujeción de una pieza a estampar (no mostrada en ninguna de las figuras adjuntas) y un cuerpo 4a, 4b de soporte que está provisto de una cavidad interior 27 donde se aloja un cilindro 26 fluido-dinámico (ver figuras 7, 8, 14 y 15). Este cilindro fluido-dinámico 26 acciona el primer brazo 3a de sujeción superior, que es móvil y está unido articulado a un eje 25 del cuerpo 4a, 4b de soporte. Esta acción del cilindro fluido-dinámico 26 se efectúa mediante un rodamiento actuador 31 asociado al vástago 28 del cilindro 26. In all the embodiments shown in the attached figures, the pneumatic gripper 1, 100, 200, 300 includes two arms 3a, 3b for holding a piece to be stamped (not shown in any of the attached figures) and a body 4a, 4b of support that is provided with an internal cavity 27 where a fluid-dynamic cylinder 26 is housed (see figures 7, 8, 14 and 15). This fluid-dynamic cylinder 26 operates the first upper clamping arm 3a, which is mobile and is articulated to an axis 25 of the support body 4a, 4b. This action of the fluid-dynamic cylinder 26 is carried out by means of an actuator bearing 31 associated with the rod 28 of the cylinder 26.
En todas las realizaciones que se describen en las figuras, la cámara 27 trasera del cilindro 26 neumático comprende un elemento amortiguador 29 que actúa de tope para el pistón 30
del cilindro. Este elemento amortiguador 29 absorbe la energía cinética procedente del movimiento del primer brazo 3a de sujeción, reduciendo de ese modo el ruido que produce la pinza neumática 1 , 100, 200, 300 durante su funcionamiento. In all the embodiments described in the figures, the rear chamber 27 of the pneumatic cylinder 26 comprises a damping element 29 that acts as a stop for the piston 30 cylinder. This damping element 29 absorbs the kinetic energy from the movement of the first clamping arm 3a, thereby reducing the noise produced by the pneumatic gripper 1, 100, 200, 300 during its operation.
La pinza neumática 1 descrita en la primera realización posee un cuerpo de soporte 4a, 4b de acero tratado y un diámetro de cilindro neumático de 25 o de 32 mm. The pneumatic gripper 1 described in the first embodiment has a supporting body 4a, 4b made of treated steel and a pneumatic cylinder diameter of 25 or 32 mm.
El segundo brazo 3b de sujeción, que corresponde al brazo inferior y es fijo queda también integrado en el cuerpo 4 de soporte de la pinza neumática 1 , 100, 200, extendiéndose de una porción delantera 4a del propio cuerpo 4 de soporte, tal y como se observa en las figuras adjuntas. The second clamping arm 3b, which corresponds to the lower arm and is fixed, is also integrated into the support body 4 of the pneumatic gripper 1, 100, 200, extending from a front portion 4a of the support body 4 itself, as It is observed in the attached figures.
El primer brazo 3a móvil presenta en todos los casos dos puntas 2a, 2b de sujeción para la chapa a estampar. En la primera realización de la pinza neumática 1 mostrada en las Figuras 1 a 8, las dos puntas 2a, 2b de sujeción están bastante próximas entre sí, aproximadamente 20 mm, mientras que en la segunda realización 100 y en la tercera 200 de la pinza están más alejadas, aproximadamente 60 mm. The first movable arm 3a has in all cases two clamping points 2a, 2b for the sheet to be stamped. In the first embodiment of the pneumatic gripper 1 shown in Figures 1 to 8, the two clamping tips 2a, 2b are quite close to each other, approximately 20 mm, while in the second embodiment 100 and in the third 200 of the gripper they are further apart, about 60 mm.
La pinza neumática 1 , 100, 200 de la presente invención se caracteriza por el hecho de que el primer brazo 3a de sujeción articulado móvil está formado por un elemento brazo 19 y fijado transversalmente con un ligero juego a su extremo frontal un brazo de compensación 10, donde dicho brazo de compensación 10 comprende dos orificios pasantes 13 separados entre sí una cierta distancia, uno en cada extremo del brazo de compensación 10 para recibir en su interior a cada punta 2 de sujeción, y un respectivo conjunto de tuerca 12a, 12b y tornillo para fijar superiormente cada punta 2 de sujeción en el interior de cada orificio 13, y en donde dicho brazo de compensación 10 y elemento brazo 19 están configurados con unos medios de basculación de modo que el brazo de compensación 10 puede bascular ligeramente respecto al eje longitudinal del elemento brazo 19. The pneumatic gripper 1, 100, 200 of the present invention is characterized by the fact that the first mobile articulated clamping arm 3a is formed by an arm element 19 and fixed transversely with a slight play to its front end a compensation arm 10 , wherein said compensation arm 10 comprises two through holes 13 spaced a certain distance from each other, one at each end of compensation arm 10 to receive inside each clamping point 2, and a respective set of nuts 12a, 12b and screw to fix superiorly each clamping point 2 inside each hole 13, and wherein said compensation arm 10 and arm element 19 are configured with tilting means so that the compensation arm 10 can be slightly tilted with respect to the axis longitudinal arm element 19.
La particular y ventajosa configuración del primer brazo 3a de sujeción articulado móvil, que está formado por un elemento brazo 19 y fijado transversalmente mediante un ligero juego a su extremo frontal un brazo de compensación 10, se muestra claramente en la figura 16. En la misma se observa que el elemento brazo 19 presenta un extremo frontal que presenta dos superficies laterales planas 33, y además el elemento brazo 19 presenta un orificio longitudinal 18 que se inicia en su superficie frontal con una dimensión y longitud tal para albergar en su interior a un eje interior 13 (mostrado, por ejemplo, en las figuras 7, 15 o 17).
En dichas figuras 7 y 15 se observa como el orificio longitudinal 18 presenta una longitud ligeramente mayor a la longitud del eje interior 13, una vez está correctamente montado en su interior y fijado mediante una tuerca 20. The particular and advantageous configuration of the first mobile articulated clamping arm 3a, which is formed by an arm element 19 and fixed transversely by means of a slight play to its front end a compensation arm 10, is clearly shown in figure 16. In the same It can be seen that the arm element 19 has a front end that presents two flat lateral surfaces 33, and furthermore the arm element 19 has a longitudinal hole 18 that begins on its front surface with a dimension and length such to house a inner shaft 13 (shown, for example, in Figures 7, 15 or 17). In said figures 7 and 15 it is observed how the longitudinal hole 18 has a length slightly greater than the length of the inner shaft 13, once it is correctly assembled inside and fixed by means of a nut 20.
Por otro lado, el brazo de compensación 10, que se muestra de modo separado en las figuras 17, 18 y 19, presenta un cuerpo alargado de cierto grosor provisto en su superficie posterior de un orificio central 22 (véase figuras 18 y 19) que se extiende en dirección transversal al brazo de compensación 10 con una dimensión tal para albergar parte del eje 13 y provisto también en esta superficie posterior de un rebaje 23 que define una superficie de encaje con al menos dos paredes laterales planas 33 y donde la distancia entre dichas paredes planas es ligeramente superior a la distancia entre las dos superficies laterales planas del elemento brazo 19, de modo que el elemento brazo 19 queda perfectamente encajado en este rebaje 23 pero tiene un ligero juego de basculación de ángulo comprendido entre 0 y 10° del brazo de compensación 10 respecto al eje longitudinal del primer brazo. On the other hand, the compensation arm 10, which is shown separately in Figures 17, 18 and 19, has an elongated body of a certain thickness provided on its rear surface with a central hole 22 (see Figures 18 and 19) that extends in a transverse direction to the compensation arm 10 with a dimension such as to house part of the shaft 13 and also provided on this rear surface with a recess 23 that defines an engaging surface with at least two flat side walls 33 and where the distance between said flat walls is slightly greater than the distance between the two flat lateral surfaces of the arm element 19, so that the arm element 19 is perfectly fitted in this recess 23 but has a slight angle tilt play between 0 and 10 ° of the compensation arm 10 with respect to the longitudinal axis of the first arm.
En la figura 20 se representa, de modo esquemático, este juego del brazo de compensación 10 comprendido entre 0 y 10° arriba o abajo del eje longitudinal del elemento brazo. Es decir que habría 5o arriba y 5o abajo respecto del eje longitudinal X-X’ del elemento brazo 19. In figure 20 this play of the compensation arm 10 is represented schematically, between 0 and 10 ° above or below the longitudinal axis of the arm element. That is, there would be 5 or above and 5 or below with respect to the longitudinal axis X-X 'of the arm element 19.
Por otro lado, una vez montado, el eje interior 13 queda dispuesto en el interior de ambos orificios 22, 18 del brazo de compensación 10 y del elemento brazo 19, y en donde a través del eje interior 13 queda unido el brazo de compensación 10 y el elemento brazo 19 y a la vez el eje permite la ligera basculación de una de las dos piezas 10, 19 entorno a dicho eje interior 13. On the other hand, once assembled, the inner shaft 13 is arranged inside both holes 22, 18 of the compensation arm 10 and the arm element 19, and where the compensation arm 10 is joined through the inner shaft 13 and the arm element 19 and at the same time the axis allows the slight tilting of one of the two pieces 10, 19 around said inner axis 13.
Otra característica de la pinza neumática 1 , 100, 200 de la presente invención estriba en la configuración particular de la superficie exterior del cuerpo de soporte 4a, 4b que, tal y como puede verse en las figuras 1 a 15, es sensiblemente cilindrico. Presenta una porción trasera 4a cilindrica, que se extiende frontalmente formando otra porción delantera 4b, también sensiblemente cilindrica. Another characteristic of the pneumatic gripper 1, 100, 200 of the present invention lies in the particular configuration of the outer surface of the support body 4a, 4b which, as can be seen in Figures 1 to 15, is substantially cylindrical. It has a cylindrical rear portion 4a, which extends frontally forming another front portion 4b, also substantially cylindrical.
Otra característica opcional de la pinza neumática 1 , 100, 200 de la presente invención se halla en la provisión de una superficie extendida 15 del segundo brazo 3b de sujeción, en donde dicha superficie extendida 15 comprende una parte o la totalidad de su superficie superior en forma de ranuras 14. En todas las realizaciones mostradas en las figuras
adjuntas, estas dos superficies ralladas 14 están formadas por una pluralidad de ranuras homogéneas que se extienden en dirección transversal al eje longitudinal del cuerpo de soporte 4a, 4b. En el caso de la figura 21 estas dos superficies ralladas 14 ocupan toda la superficie del tramo extendido 15, mientras que en el caso de las figuras 1 a 15 sólo ocupa una parte (es decir no la totalidad) de dichos tramos extendidos 15. Another optional feature of the pneumatic gripper 1, 100, 200 of the present invention is found in the provision of an extended surface 15 of the second clamping arm 3b, wherein said extended surface 15 comprises a part or all of its upper surface in form of grooves 14. In all the embodiments shown in the figures adjoined, these two grated surfaces 14 are formed by a plurality of homogeneous grooves extending transversely to the longitudinal axis of the support body 4a, 4b. In the case of Figure 21 these two grated surfaces 14 occupy the entire surface of the extended section 15, while in the case of Figures 1 to 15 they only occupy a part (that is to say not all) of said extended sections 15.
Según se puede apreciar en los detalles 1 y 3 de la figura 21 , dichas dos superficies ralladas 14 presentan unas ranuras regulares de igual profundidad y misma sección (en este caso una sección en forma de zigzag de perfil triangular). En el detalle 3, que corresponde a una ranura, se aprecia que su profundidad es entorno a unos 0,5 mm, la distancia entre las puntas de las crestas es de 1 mm y el ángulo entre dos planos de crestas contiguos es de 90°. Esta configuración concreta de la pluralidad de ranuras se ha demostrado por parte del titular como muy ventajosa, para otorgar una óptima fricción con la superficie interior de la chapa, la cual apoya sobre las líneas de las distintas crestas que conforman esta superficie ranurada. As can be seen in details 1 and 3 of figure 21, said two grated surfaces 14 have regular grooves of equal depth and the same section (in this case a section in the form of a zigzag with a triangular profile). In detail 3, which corresponds to a groove, it can be seen that its depth is around 0.5 mm, the distance between the tips of the ridges is 1 mm and the angle between two contiguous ridge planes is 90 ° . This specific configuration of the plurality of grooves has been shown by the owner to be very advantageous, in order to provide optimum friction with the inner surface of the sheet, which rests on the lines of the different ridges that make up this grooved surface.
El solicitante de esta invención ha demostrado (véase los resultados obtenidos por las pruebas mostradas en la tabla anterior) que la combinación entre la sujeción ejercida por las puntas sujetadas por el brazo basculante junto con la superficie inferior extendida ranurada da unos resultados realmente sorprendentes y no evidentes para un experto en la materia. The applicant of this invention has shown (see the results obtained by the tests shown in the table above) that the combination between the grip exerted by the tips held by the rocker arm together with the grooved extended lower surface gives truly surprising results and not obvious to a person skilled in the art.
En esta misma figura 21 se aprecia un detalle 2 en el cual se aprecia la configuración de la parte inferior del tornillo 21 que configura la punta 2b o 2a y cuyo extremo inferior presenta insertado dentro de dicho extremo inferior una rótula esférica perfilada 22. Dicha rótula esférica perfilada 22 tiene la capacidad de poder rotar unos 9o respecto al cuerpo del tornillo 21. In this same figure 21 a detail 2 can be seen in which the configuration of the lower part of the screw 21 that configures the tip 2b or 2a and whose lower end has a profiled spherical ball joint 22 inserted inside said lower end. Said ball joint spherical shaped 22 has the ability to rotate about 9 or about the body of the screw 21.
En las figuras 22a, 22b y 22c se muestra la pinza de la primera realización una vez está instalada en un posible soporte porta-pinzas y el mismo discurre a lo largo de unos perfiles (aquí sólo se muestra uno de los dos perfiles 32). Tal y como se aprecia, el anillo 1 1 puede rotarse manualmente por parte del usuario adquiriendo las distintas posiciones angulares deseadas, por ejemplo, apuntando hacia el lateral izquierdo en la figura 22a, hacia arriba en la siguiente figura 22b o hacia el lateral derecho en la última figura 22c. Figures 22a, 22b and 22c show the clamp of the first embodiment once it is installed in a possible clamp-holder support and it runs along some profiles (here only one of the two profiles 32 is shown). As can be seen, the ring 1 1 can be manually rotated by the user acquiring the different desired angular positions, for example, pointing towards the left side in figure 22a, upwards in the following figure 22b or towards the right side in the last figure 22c.
En particular, esta primera realización de la invención que se describe se ha comprobado que la pinza 1 con diámetro de pistón proporciona una fuerza de sujeción de hasta 180
decaNewtons (daN) para una presión de trabajo de 6 bar de trabajo. In particular, this first embodiment of the invention described has been found that the piston diameter caliper 1 provides a clamping force of up to 180 decaNewtons (daN) for a working pressure of 6 bar.
En la pinza 300 correspondiente a la cuarta realización de la invención, que es similar a la de la primera realización, pero en este caso no hay ningún anillo, las tomas 15 de entrada y salida de fluido están dispuestas en la cara posterior de la pinza, véase figura 27. En esta cuarta realización, además, el segundo brazo fijo 3b no presenta ninguna superficie extendida, sino que, según se muestra en la figura 25 queda alineado verticalmente con las puntas 2, 2b. En las figuras 23 a 28 se observa como la parte final del segundo brazo fijo 3b comprende dos superficies ralladas 14 localizadas en las dos partes extremas. In the caliper 300 corresponding to the fourth embodiment of the invention, which is similar to that of the first embodiment, but in this case there is no ring, the fluid inlet and outlet intakes 15 are arranged on the rear face of the caliper. , see figure 27. In this fourth embodiment, furthermore, the second fixed arm 3b does not present any extended surface, but, as shown in figure 25, is vertically aligned with the tips 2, 2b. Figures 23 to 28 show how the end part of the second fixed arm 3b comprises two grated surfaces 14 located in the two end parts.
En la figura 28 se ilustra una sección longitudinal de la pinza 300 de la cuarta realización, en posición cerrada. En dicha vista se aprecia como las tomas 15 de entrada y salida de fluido están encastadas en la parte posterior de la pinza 300, y más concretamente en el elemento amortiguador 29 trasero. También se aprecia como la pieza 30 es igual que la pinza 1 de la realización primera. El único cambio estructural de los componentes internos del cilindro 26 es una pieza intermedia que presenta una configuración distinta y más simple que la de la pinza 1 de la realización primera al no existir anillo. A longitudinal section of the gripper 300 of the fourth embodiment, in the closed position, is illustrated in Figure 28. In said view, it can be seen how the fluid inlet and outlet intakes 15 are embedded in the rear part of the caliper 300, and more specifically in the rear shock absorbing element 29. It is also seen how the part 30 is the same as the clamp 1 of the first embodiment. The only structural change of the internal components of the cylinder 26 is an intermediate piece that has a different and simpler configuration than that of the clamp 1 of the first embodiment, since there is no ring.
A pesar de que se ha hecho referencia a unas realizaciones concretas de la invención, es evidente para un experto en la materia que la pinza neumática 1 , 100, 200, 300 descrita, en sus distintas variantes, es susceptible de numerosas variaciones y modificaciones, y que todos los detalles mencionados pueden ser substituidos por otros técnicamente equivalentes, sin apartarse del ámbito de protección definido por las reivindicaciones adjuntas.
Although reference has been made to specific embodiments of the invention, it is clear to a person skilled in the art that the described pneumatic gripper 1, 100, 200, 300, in its various variants, is susceptible to numerous variations and modifications, and that all the aforementioned details can be replaced by other technically equivalent ones, without departing from the scope of protection defined by the appended claims.
Claims
1. Pinza neumática 1 , 100, 200, 300 para una prensa o servoprensa de estampación con sistema transfer, de las que una o más pinzas están configuradas para sujetar por un extremo a una chapa o pieza, y en donde la pinza neumática 1 , 100, 200, 300 comprende: 1. Pneumatic clamp 1, 100, 200, 300 for a stamping press or servo press with transfer system, of which one or more clamps are configured to hold at one end to a sheet or part, and where the pneumatic clamp 1, 100, 200, 300 comprises:
un primer brazo 3a y un segundo brazo 3b, adaptados para sujetar entre ellos a la chapa o pieza a estampar, y a first arm 3a and a second arm 3b, adapted to hold the sheet or piece to be stamped between them, and
un cuerpo de soporte 4, 4a, 4b que está provisto de una cavidad interior donde se aloja un cilindro fluido-dinámico 26, siendo susceptible dicho cilindro 26 de accionar el primer brazo 3a de sujeción de la pinza neumática 1 , 100, 200, 300 que está unido articulado a dicho cuerpo de soporte 4a, 4b, a support body 4, 4a, 4b that is provided with an internal cavity where a fluid-dynamic cylinder 26 is housed, said cylinder 26 being capable of operating the first clamping arm 3a of the pneumatic gripper 1, 100, 200, 300 which is articulated to said support body 4a, 4b,
caracterizada por el hecho de que, como mínimo, el primer brazo 3a de sujeción articulado comprende: characterized by the fact that, at least, the first articulated clamping arm 3a comprises:
- un elemento brazo 19 que se extiende en dirección de un eje longitudinal Y- Y’; - an arm element 19 that extends in the direction of a longitudinal axis Y-Y ';
- un brazo de compensación 10 fijado de modo basculante al extremo frontal del elemento brazo 19, donde el brazo de compensación 10 está dispuesto transversalmente al eje Y-Y’, y donde dicho brazo de compensación 10 comprende dos orificios pasantes 21 separados una cierta distancia entre sí, equidistante del eje Y-Y’, uno en cada extremo del brazo de compensación 10 configurados para recibir en su interior a una respectiva punta 2a, 2b de sujeción, en donde dichos brazo de compensación 10 y elemento brazo 19 están unidos por medio de unos medios de basculación configurados de modo que el brazo de compensación 10 puede bascular ligeramente de un eje X-X’ transversal al eje longitudinal Y-Y’; y - a compensation arm 10 fixed in a swingable manner to the front end of the arm element 19, where the compensation arm 10 is arranged transversely to the Y-Y 'axis, and where said compensation arm 10 comprises two through holes 21 spaced a certain distance from each other, equidistant from the Y-Y 'axis, one at each end of the compensation arm 10 configured to receive inside a respective clamping point 2a, 2b, wherein said compensation arm 10 and arm element 19 are joined by means of tilting means configured so that the compensation arm 10 can be tilted slightly from an axis X-X 'transverse to the longitudinal axis Y-Y'; Y
- respectivas puntas de sujeción 2a, 2b dispuestas en el interior de cada orificio pasante 21 del brazo de compensación 10, provistas cada punta de sujeción 2a, 2b de un sistema de fijación configurado para fijar cada punta 2a, 2b al brazo de compensación 10. - respective clamping points 2a, 2b arranged inside each through hole 21 of the compensation arm 10, each clamping point 2a, 2b provided with a fixing system configured to fix each point 2a, 2b to the compensation arm 10.
2. Pinza neumática 1 , 100, 200, 300 según la reivindicación 1 , en la que el primer brazo 3a es un brazo móvil que está unido articulado a dicho cuerpo de soporte 4 y el
segundo brazo 3b es un brazo fijo de sujeción queda está integrado en el cuerpo de soporte 4. Pneumatic gripper 1, 100, 200, 300 according to claim 1, in which the first arm 3a is a mobile arm that is articulated to said support body 4 and the second arm 3b is a fixed clamping arm that is integrated into the support body 4.
3. Pinza neumática 1 , 100, 200, 300 según la reivindicación 1 , en la que tanto el primer brazo 3a como el segundo brazo 3b son respectivos brazos móviles que está unidos articulado a dicho cuerpo de soporte 4. Pneumatic gripper 1, 100, 200, 300 according to claim 1, in which both the first arm 3a and the second arm 3b are respective movable arms that are articulated to said support body 4.
4. Pinza neumática 1 , 100, 200, 300 según una cualquiera de las reivindicaciones anteriores, en la que el primer brazo 3a comprende: Pneumatic gripper 1, 100, 200, 300 according to any one of the preceding claims, in which the first arm 3a comprises:
- un elemento brazo 19 con un extremo frontal que presenta dos superficies laterales planas, y además el elemento brazo 19 presenta un orificio longitudinal 18 en su superficie frontal con un diámetro y profundidad tal para albergar a una parte de un eje interior 13; - an arm element 19 with a front end presenting two flat lateral surfaces, and furthermore the arm element 19 has a longitudinal hole 18 on its front surface with a diameter and depth such as to house a part of an inner shaft 13;
- un brazo de compensación 10 provisto en su superficie posterior de un orificio central que se extiende en dirección longitudinal X-X’ al cuerpo del brazo de compensación 10 con un diámetro y profundidad tal para albergar a una parte del eje interior 13 y provisto también en esta superficie posterior de un rebaje que define una superficie de encaje 23 con al menos dos paredes laterales planas y donde la distancia entre dichas paredes planas es ligeramente superior a la distancia entre las dos superficies laterales planas del elemento brazo 19, de modo que el elemento brazo 19 queda perfectamente encajado en esta superficie rebajada 23 pero con un ligero juego de basculación de un ángulo de giro comprendido entre 0 y 10° del brazo de compensación 10 respecto al eje longitudinal Y-Y’ del elemento brazo 19, y además el brazo de compensación comprende dos orificios laterales pasantes separados entre sí una cierta distancia, equidistante del eje de rotación, uno en cada extremo del brazo de compensación, para recibir en su interior a cada punta de sujeción; - a compensation arm 10 provided on its rear surface with a central hole extending in the longitudinal direction X-X 'to the body of the compensation arm 10 with a diameter and depth such as to house a part of the inner shaft 13 and also provided on this rear surface of a recess that defines a fitting surface 23 with at least two flat side walls and where the distance between said flat walls is slightly greater than the distance between the two flat side surfaces of the arm element 19, so that the arm element 19 is perfectly embedded in this recessed surface 23 but with a slight tilt play of a rotation angle between 0 and 10 ° of the compensation arm 10 with respect to the longitudinal axis Y-Y 'of the arm element 19, and also the compensation arm comprises two lateral through holes spaced a certain distance from each other, equidistant from the axis of rotation, one at each end of the arm d e compensation, to receive each clamping point inside;
- respectivas puntas de sujeción 2a, 2b dispuestas en el interior de cada orificio pasante 21 del brazo de compensación, provistas cada punta de sujeción 2a, 2b de una tuerca 12a, 12b para fijarlas al brazo de compensación y provistas de una rótula perfilada que sobresale ligeramente de sus extremos inferiores; y - respective clamping points 2a, 2b arranged inside each through hole 21 of the compensation arm, each clamping point 2a, 2b provided with a nut 12a, 12b to fix them to the compensation arm and provided with a protruding profiled ball joint slightly from its lower ends; Y
- el eje interior 13 dispuesto en el interior de ambos orificios 22, 18 del brazo de compensación 10 y del elemento brazo 19, de modo a través del eje interior 13 quedan unidos el brazo de compensación 10 y el elemento brazo
19 y a la vez el eje interior 13 permite el ligero giro de una de las dos piezas 10 o 19 entorno a dicho eje interior 13. - the inner shaft 13 arranged inside both holes 22, 18 of the compensation arm 10 and the arm element 19, so that the compensation arm 10 and the arm element are joined through the inner shaft 13 19 and at the same time the inner shaft 13 allows the slight rotation of one of the two pieces 10 or 19 around said inner shaft 13.
5. Pinza neumática 1 , 100, 200, 300 según una cualquiera de las reivindicaciones anteriores, en la que el brazo de compensación 10 presenta una distancia equidistante entre los dos orificios 21 para las puntas comprendida dicha distancia entre 19 y 70 mm. Pneumatic gripper 1, 100, 200, 300 according to any one of the preceding claims, in which the compensation arm 10 has an equidistant distance between the two holes 21 for the tips, said distance between 19 and 70 mm.
6. Pinza neumática 1 , 100, 200, 300 según una cualquiera de las reivindicaciones anteriores, en la que, además, comprende una tuerca 20 con una prolongación posterior para fijar el eje interior 13 y estando configurada para quedar dispuesta en el interior del extremo frontal del eje interior 13 y al quedar montado hace tope con la cara frontal del brazo de compensación 19. Pneumatic gripper 1, 100, 200, 300 according to any one of the preceding claims, in which, in addition, it comprises a nut 20 with a rear extension to fix the inner shaft 13 and being configured to be arranged inside the end front of the inner shaft 13 and when mounted it abuts the front face of the compensation arm 19.
7. Pinza neumática 1 , 100, 200, 300 según una cualquiera de las reivindicaciones anteriores, en la que el segundo brazo 3b de sujeción comprende una superficie extendida 15 que se extiende hacia delante más allá del plano vertical donde están dispuestas las puntas 2a, 2b de sujeción. Pneumatic gripper 1, 100, 200, 300 according to any one of the preceding claims, in which the second clamping arm 3b comprises an extended surface 15 that extends forwardly beyond the vertical plane where the tips 2a are arranged, 2b fastening.
8. Pinza neumática 1 , 100, 200, 300 según una cualquiera de las reivindicaciones anteriores, en la que la superficie extendida 15 se extiende hacia delante una longitud comprendida entre 12 y 60 mm. Pneumatic gripper 1, 100, 200, 300 according to any one of the preceding claims, in which the extended surface 15 extends forward a length comprised between 12 and 60 mm.
9. Pinza neumática 1 , 100, 200, 300 según la reivindicación anterior, en la que la superficie extendida 15 del segundo brazo 3b de sujeción comprende, al menos, como mínimo una superficie ranurada 14 en cada zona donde apoyan las puntas 2, y en donde la superficie rallada comprende unas rallas que se extienden en dirección transversal al eje longitudinal del cuerpo soporte 4. Pneumatic gripper 1, 100, 200, 300 according to the preceding claim, in which the extended surface 15 of the second clamping arm 3b comprises at least one grooved surface 14 in each area where the tips 2 bear, and wherein the grated surface comprises stripes that extend transversely to the longitudinal axis of the support body 4.
10. Pinza neumática 1 , 100, 200, 300 según la reivindicación anterior, en la que la superficie ranurada 14 en la zona donde apoyan las puntas 2a, 2b ocupa una zona como mínimo igual a la superficie de la parte inferior de la punta 2a, 2b. Pneumatic gripper 1, 100, 200, 300 according to the preceding claim, in which the grooved surface 14 in the area where the tips 2a, 2b bear, occupies an area at least equal to the surface of the lower part of the tip 2a , 2b.
1 1. Pinza neumática 1 , 100, 200, 300 según la reivindicación 7 u 8, en la que la superficie ranurada 14 presenta unas ranuras regulares de igual profundidad y de
sección triangular. 1 1. Pneumatic gripper 1, 100, 200, 300 according to claim 7 or 8, wherein the grooved surface 14 has regular grooves of equal depth and of triangular section.
12. Pinza neumática 1 , 100, 200, 300 según una cualquiera de las reivindicaciones anteriores, en la que presenta un cuerpo de soporte 4a, 4b sustancialmente cilindrico. Pneumatic gripper 1, 100, 200, 300 according to any one of the preceding claims, in which it has a substantially cylindrical support body 4a, 4b.
13. Pinza neumática 1 , 100, 200 según una cualquiera de las reivindicaciones anteriores, en la que comprende un anillo rotable 11 entorno al eje longitudinal del cuerpo de soporte 4a, 4b, en donde el anillo rotable 11 comprende dos tomas 15 de entrada y salida de fluido, y en donde el anillo 1 1 está configurado para ser acoplable exteriormente a una parte posterior 4a del cuerpo de soporte. Pneumatic gripper 1, 100, 200 according to any one of the preceding claims, in which it comprises a rotatable ring 11 around the longitudinal axis of the support body 4a, 4b, wherein the rotatable ring 11 comprises two input sockets 15 and fluid outlet, and wherein the ring 1 1 is configured to be externally engageable to a rear part 4a of the support body.
14. Pinza neumática 1 , 100, 200 según la reivindicación anterior, en la que el anillo rotable 1 1 además comprende un canal 17 para pasar la/s conexión/es eléctrica/s 18. Pneumatic clamp 1, 100, 200 according to the preceding claim, in which the rotatable ring 1 1 further comprises a channel 17 for passing the electrical connection / s 18.
15. Pinza neumática 1 , 100, 200 según las reivindicaciones anteriores 9 o 10, en la que una porción posterior 4a del cuerpo de soporte presenta una superficie con una pluralidad de ranuras en distintos puntos para facilitar el acople del anillo rotable 11 en la posición concreta de trabajo sin posibilidad de extraerse pero con posibilidad de giro. Pneumatic gripper 1, 100, 200 according to preceding claims 9 or 10, in which a rear portion 4a of the support body has a surface with a plurality of grooves at different points to facilitate the coupling of the rotatable ring 11 in position Concrete work without the possibility of extraction but with the possibility of turning.
16. Pinza neumática 300 según la reivindicación 1 , en la que comprende respectivas tomas 15 de entrada y salida de fluido dispuestas, de modo fijo, saliendo de la cara posterior del cuerpo soporte 4, 4a. 16. Pneumatic gripper 300 according to claim 1, wherein it comprises respective fluid inlet and outlet intakes 15 arranged, in a fixed manner, emerging from the rear face of the support body 4, 4a.
17. Pinza neumática 1 , 100, 200, 300 según la reivindicación 1 , en la que el extremo opuesto del primer brazo 3a de sujeción comprende una ranura 24 que sirve de guía para un rodamiento 31 actuador que está unido solidario al vástago 28 del cilindro 26 de accionamiento de dicho brazo 3a articulado. 17. Pneumatic gripper 1, 100, 200, 300 according to claim 1, in which the opposite end of the first clamping arm 3a comprises a groove 24 that serves as a guide for an actuator bearing 31 that is integrally attached to the rod 28 of the cylinder 26 for actuating said articulated arm 3a.
18. Pinza neumática 1 , 100, 200, 300 según la reivindicación 1 , en la que dicho cilindro fluido-dinámico 26 es un cilindro neumático de diámetro superior a 20 mm. Pneumatic gripper 1, 100, 200, 300 according to claim 1, in which said fluid-dynamic cylinder 26 is a pneumatic cylinder with a diameter greater than 20 mm.
19. Pinza neumática 1 , 100, 200, 300 según la reivindicación 1 , en la que las puntas de
sujeción 2a, 2b comprenden una respectiva rótula 22 con una superficie exterior perfilada que sobresale ligeramente por debajo de sus extremos inferiores.
Pneumatic gripper 1, 100, 200, 300 according to claim 1, in which the tips of fasteners 2a, 2b comprise a respective ball joint 22 with a contoured outer surface projecting slightly below its lower ends.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20737508.0A EP3981546B1 (en) | 2019-06-04 | 2020-06-03 | Pneumatic clamp for plates with tilting jaws |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ESP201930502 | 2019-06-04 | ||
ES201930502A ES2798024B2 (en) | 2019-06-04 | 2019-06-04 | IMPROVED PNEUMATIC GRIPPER FOR STAMPING PRESS WITH TRANSFER SYSTEM |
Publications (1)
Publication Number | Publication Date |
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WO2020245487A1 true WO2020245487A1 (en) | 2020-12-10 |
Family
ID=71527819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES2020/070373 WO2020245487A1 (en) | 2019-06-04 | 2020-06-03 | Pneumatic clamp for plates with tilting jaws |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3981546B1 (en) |
ES (1) | ES2798024B2 (en) |
WO (1) | WO2020245487A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022128535A1 (en) * | 2020-12-17 | 2022-06-23 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Readjustment device and readjustment method for a plate-shaped workpiece in a processing machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022114502B4 (en) * | 2022-06-09 | 2024-08-01 | Schaeffler Technologies AG & Co. KG | Gripping device for gripping during the manufacture of a bipolar plate |
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US20010038215A1 (en) * | 1996-10-07 | 2001-11-08 | Moilanen Steven M. | Modular stamped parts transfer gripper |
DE202010010687U1 (en) * | 2010-07-27 | 2010-09-30 | Krahn, Heinrich | Universal balancing clamping element |
ES1140856U (en) | 2015-06-08 | 2015-07-06 | Miquel SARABIA TRILLA | Improved clamp for press release with transfer system (Machine-translation by Google Translate, not legally binding) |
CN109676049A (en) * | 2019-01-04 | 2019-04-26 | 济南凯丰数控机械有限公司 | Four side folding brakes clamp rotation feeder |
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DE102012003918C5 (en) * | 2012-02-28 | 2017-03-09 | Springer Gmbh | Drive device for driving a device for gripping and / or clamping a workpiece comprising a piston-cylinder unit with pressure medium channel in the piston rod |
US9975252B2 (en) * | 2014-09-19 | 2018-05-22 | Delaware Capital Formation, Inc. | Gripper |
CN208542861U (en) * | 2018-06-05 | 2019-02-26 | 广州市恒宇印铁制罐有限公司 | A kind of thin plate feeding device |
-
2019
- 2019-06-04 ES ES201930502A patent/ES2798024B2/en active Active
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- 2020-06-03 EP EP20737508.0A patent/EP3981546B1/en active Active
- 2020-06-03 WO PCT/ES2020/070373 patent/WO2020245487A1/en unknown
Patent Citations (6)
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DE729654C (en) * | 1940-12-21 | 1942-12-19 | Wilhelm Thienes | vice |
DE4222741A1 (en) * | 1991-09-30 | 1993-04-01 | Horst Warneke | Production line for sheet metal shuttering for concrete - has stamping, folding and welding machines arranged in line |
US20010038215A1 (en) * | 1996-10-07 | 2001-11-08 | Moilanen Steven M. | Modular stamped parts transfer gripper |
DE202010010687U1 (en) * | 2010-07-27 | 2010-09-30 | Krahn, Heinrich | Universal balancing clamping element |
ES1140856U (en) | 2015-06-08 | 2015-07-06 | Miquel SARABIA TRILLA | Improved clamp for press release with transfer system (Machine-translation by Google Translate, not legally binding) |
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WO2022128535A1 (en) * | 2020-12-17 | 2022-06-23 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Readjustment device and readjustment method for a plate-shaped workpiece in a processing machine |
Also Published As
Publication number | Publication date |
---|---|
ES2798024A1 (en) | 2020-12-04 |
EP3981546A1 (en) | 2022-04-13 |
EP3981546B1 (en) | 2024-07-03 |
ES2798024B2 (en) | 2021-05-13 |
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