EP1661629A2 - Vibratory apparatus for ejecting items - Google Patents
Vibratory apparatus for ejecting items Download PDFInfo
- Publication number
- EP1661629A2 EP1661629A2 EP05110686A EP05110686A EP1661629A2 EP 1661629 A2 EP1661629 A2 EP 1661629A2 EP 05110686 A EP05110686 A EP 05110686A EP 05110686 A EP05110686 A EP 05110686A EP 1661629 A2 EP1661629 A2 EP 1661629A2
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- EP
- European Patent Office
- Prior art keywords
- piston
- cavity
- conduit
- rod
- ejector according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000010276 construction Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
- B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/04—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
- B06B1/045—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism using vibrating magnet, armature or coil system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/12—Fluid oscillators or pulse generators
Definitions
- the present invention refers to an apparatus for generally displacing items that are laid down onto a collecting tray or into a collecting container, by imparting a vibratory motion to said tray or container in a generally horizontal or inclined direction, wherein this apparatus will be generally and conventionally referred to as a scrap ejector in the description that follows hereinbelow.
- scrap ejectors are known in the art; for instance, a scrap ejector is known from the disclosure in the Italian patent application No. PN2001A000087, which makes use of an improved and balanced type of connection of a pneumatic motor to a container so as to impart a vibratory motion to said container.
- PN2001A000087 makes use of an improved and balanced type of connection of a pneumatic motor to a container so as to impart a vibratory motion to said container.
- no indication is given in said patent as far as the type and mode of operation of said pneumatic motor are concerned.
- auxiliary piston moving crosswise, i.e. transversally relative to the main pistons is driven via a cam system based on a rubbing action, and this fact is largely known to be the cause of not only a quite rapid wear-down, but also a power loss, due to a greater usage of force, that unavoidably leads to slowed-down operating rates.
- a scrap ejector comprises a pneumatic motor 1, a rod 2 that is driven into an axial motion by said motor and is connected to a drive plate 6, which is in turn connected to a sliding plate or, more simply, slide 3 that carries the pan or container (not shown) onto or into which the items to be removed are collected.
- Said drive plate 6 may be firmly joined, by means of two tie rods 41 and 42, to a second drive plate 7 separated from the first one, so as to enlarge the resting base for the slide 3.
- said pneumatic motor 1 comprises an outer body 4, from an aperture of which said rod 2 is able to come out.
- a first cylindrical cavity 5 which is in communication with said aperture 8 and, furthermore, accommodates a first piston 9 connected with a face 10 thereof to the inward end portion of said rod 2.
- a second cylindrical cavity 11 which is arranged so as to connect said first cavity 5 with the exterior of said outer body 4 on the opposite side of the aperture 8.
- a second piston 12 adapted to slidably displace therein in a substantially sealed, i.e. fluid-tight manner, except for the cases that will be described further hereinbelow, so that said second piston substantially behaves as a shutter as regards its own cavity 11.
- first and second cavities and therefore the pistons 9 and 12 associated thereto, are such that the first cavity 5 has a cross-section area B that is larger than the cross-section area A of the second cavity 11, as this is illustrated schematically in Figures 3 and 4.
- a first manner is to provide a single annular groove 14 in the outer surface of the piston 12, so that said two distinct6 grooves can be considered as being simple sub-portions of said single annular groove 14, as this is symbolically illustrated in Figure 5; or between said two physically and actually separated grooves 14 and 15 there is provided a through-conduit 19 that connects them to each other in a permanent manner, as this is best illustrated in Figure 6.
- first conduit 20 connects the chamber of the first cavity 5, as also comprised between said two pistons 9, 12, with a first port 21 provided in the surface of said second cavity 11;
- second conduit 22 connects a source of compressed gas 23, usually compressed air, with a second port 24, which is also provided in the outer surface of the same second cavity;
- third conduit 25 connects the outside withy a third port 26 that is again provided in the surface of said second cavity 11.
- first two ports 21 and 24 are so positioned and spaced from each other as to enable the second piston 12 can move into both:
- the drive plate 6 is rigidly connected to the second plate 7, which is so sized and arranged, relative to the second piston 12, as to ensure that, when said rod 2 is pushed outwards, the second plate 7 pushes in turn the outer portion of said second piston 12 towards the interior of the outer body 4, owing to said rod 2, said first plate 6, said tie rods 41, 42 and said second plate 7 being appropriately linked together.
- the first piston 9 stops moving, thereby putting an end to the first stroke distance thereof.
- an elastic spring 30, which is suitably provided in the remaining portion (not comprised between the pistons) of the first cavity, and which is no longer contrasted by the pressure acting upon the first piston at this point, starts urging the latter into moving in the opposite direction.
- the motion of the whole apparatus is substantially due to the reciprocating movement of the first piston, which is alternately exposed to a pneumatic force on a side and an opposite force (the spring 30) on the other side, thereby behaving like a double-acting piston.
- the cavity 45 - instead of being partially occupied by the spring 30 - is allowed to communicate, via a suitable channel 47, with a source of compressed gas (not shown), so that the elastic countering action of the elastic spring 30 is in this case replaced with the pressure exerted by said compressed gas against the opposing face 10 of the first piston lying therebehind.
- a source of compressed gas not shown
- the advantage of such solution lies in the elimination of the spring 30, along with the largely known drawbacks connected therewith.
- the spiral spring 30 is replaced by the pneumatic force acting upon the face 10 of the first piston, thereby providing a gas spring of a conventional kind.
- a check valve 49 is fitted in said conduit 48 to prevent the pressure in the cavity 45 from being released, in particular in the transient phase between the third and the fourth setting.
- the pressure acting on the side 10 of the first piston 9 will under no circumstance be sufficient, i.e. rise to a value enabling it to overcome the force being exerted upon the piston 9 by the pressure acting against the opposite face 33, since, while the pressures on the two faces are the same, the surface area of the face 10 is clearly smaller than the surface area of the face 33, due to the presence of the rod 2, on which no pressure is in fact exerted.
- a small spacing member 32 having an appropriately reduced diameter, preferably either on the face 33 of the first piston or the face 34 of the second piston 12.
- said second conduit 22 and/or said third conduit 25 are provided with appropriate flow control valves 50, 51, which are adapted to be operated selectively so as to be able to deliver a flow of gas at such pressure and rate as to bring about differing velocities in accordance with the actual operating needs ( Figure 12).
- the asymmetry in the operation of the scrap ejector may of course be ensured through a number of different means, and combinations thereof, i.e. by selecting and calibrating in an appropriate manner - as all those skilled in the art are anyway fully capable of doing - said elastic spring 30, the ratio of the cross-section area of the rod 2 to the cross-section area of the first piston 9, the adjustment or setting of either one or both said valves 50, 51 in the respective second conduit 22 and third conduit 25 thereof, as the case may be.
- conduits 47 and 48 delivering compressed gas into the cavity 45 are fully eliminated, while providing the same cavity 45 in a fluid-tight construction, possibly pre-loaded with an initial bias pressure of such a value as to cause the first piston 9 to move back against the second piston 12 as soon as the third conduit 25 is put in connection, i.e. is set into communicating with the portion of said first cavity 5 comprised between the two pistons.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Jet Pumps And Other Pumps (AREA)
- Physical Vapour Deposition (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
- The present invention refers to an apparatus for generally displacing items that are laid down onto a collecting tray or into a collecting container, by imparting a vibratory motion to said tray or container in a generally horizontal or inclined direction, wherein this apparatus will be generally and conventionally referred to as a scrap ejector in the description that follows hereinbelow.
- Various kinds of scrap ejectors are known in the art; for instance, a scrap ejector is known from the disclosure in the Italian patent application No. PN2001A000087, which makes use of an improved and balanced type of connection of a pneumatic motor to a container so as to impart a vibratory motion to said container. However, no indication is given in said patent as far as the type and mode of operation of said pneumatic motor are concerned.
- Known from the disclosure in US 4,192,419 is an oscillating material conveyor based on a reciprocating motion in a horizontal direction, which makes use of both suitably pressure-adjusted fluid means and elastic spring means to bring about said reciprocating motion. The main purpose of the invention described in this patent publication is to obtain a motion in which acceleration is closely controlled in accordance with the position of the conveyor. Now, owing to such requirement, the means used to move the conveyor are necessarily quite complicated, and therefore quite expensive altogether, this limitation being on the other hand of no practical avail in all those cases implying driving systems for simple, low-cost and reliable scrap conveyors that do not involve any particular requirement as far as motion or displacement acceleration is concerned.
- Known from the disclosure in US 5,467,859 is a scrap ejector, the movement of which is based on a pair of mutually opposing pistons that ensure the required reciprocating motion; the compressed air or gas is let into the two chambers, in which said two pistons are slidably arranged, through a complex valve arrangement actuated by the movement of the two pistons themselves or the members connected thereto. While clearly advantageous, since it does not make use of elastic springs that are subject to wear and breakdown, this arrangement has anyway a couple of specific drawbacks deriving from the fact that it requires the use of two pistons, along with the related chambers and the mechanical members and parts associated therewith, instead of just a single piston as required in prior-art solutions of this kind. Furthermore, the auxiliary piston moving crosswise, i.e. transversally relative to the main pistons is driven via a cam system based on a rubbing action, and this fact is largely known to be the cause of not only a quite rapid wear-down, but also a power loss, due to a greater usage of force, that unavoidably leads to slowed-down operating rates.
- Known from the US patent publication No. 4,593,603 is a scrap ejector that makes again use of two distinct pistons to bring about the required reciprocating, i.e. oscillating movement, which in this case is an asymmetrical one, in the sense that the oscillation speed in one direction is different from the oscillation speed in the opposite direction and, in particular, the speed in a travel direction is slower, while its acceleration is however caused to increase in a controlled gradual manner, whereas the speed in the other travel direction is higher.
- Even this solution, however, implies a quite complicated construction, since the two pistons and the related chambers have different diameters so as to be able to generate different forces. Furthermore, the valve arrangement used is still more complex owing to the need for it to ensure said speed control in the slower travel motion.
- It would therefore be desirable, and it is actually a main object of the present invention, to provide a solution enabling a scrap ejector to be made, which is capable of doing away with the various drawbacks of prior-art solutions as described above and, in particular, is simple and capable of operating in a reliable manner, and which, in a particular embodiment thereof, is also capable of operating in an asymmetrical mode of operation.
- These aims, along with other features of the present invention, are reached in scrap ejectors of the kind provided with a pneumatic motor as described and recited in the appended claims. Features and advantages of the present invention will anyway be more readily and clearly understood from the description that is given below by way of non-limiting example with reference to the accompanying drawings, in which:
- Figures 1 and 1A are perspective views with and without slide, respectively, of the construction structure of a scrap ejector according to the prior art;
- Figure 2 is a simplified view of a horizontal planar section of a scrap ejector according to the present invention, in a first operating stage thereof;
- Figure 3 is a simplified cross-sectional view of some parts forming g the apparatus illustrated in Figure 2;
- Figure 4 is a view of the parts shown in Figure 3 according to the section "s" in the same Figure;
- Figures 5 and 6 are views of two different embodiments of a detail of the apparatus shown in the preceding Figures;
- Figures 7 to 9 are horizontal planar cross-sectional views of the positions of the various functional members and parts in three different operating states thereof following the one shown in Figure 2, respectively;
- Figures 10 and 11 are views of two respective different embodiments of the present invention; and
- Figure 12 is a view of a further different embodiment of the present invention.
- With reference to Figure 1, a scrap ejector according to the prior art comprises a
pneumatic motor 1, arod 2 that is driven into an axial motion by said motor and is connected to adrive plate 6, which is in turn connected to a sliding plate or, more simply, slide 3 that carries the pan or container (not shown) onto or into which the items to be removed are collected. - Said
drive plate 6 may be firmly joined, by means of twotie rods second drive plate 7 separated from the first one, so as to enlarge the resting base for the slide 3. - According to the present invention, said
pneumatic motor 1 comprises anouter body 4, from an aperture of which saidrod 2 is able to come out. - With reference to Figure 2, within this
outer body 4 there is provided a firstcylindrical cavity 5, which is in communication with saidaperture 8 and, furthermore, accommodates afirst piston 9 connected with aface 10 thereof to the inward end portion of saidrod 2. - In the
outer body 4 there is provided a secondcylindrical cavity 11, which is arranged so as to connect saidfirst cavity 5 with the exterior of saidouter body 4 on the opposite side of theaperture 8. In this secondcylindrical cavity 11 there is accommodated asecond piston 12 adapted to slidably displace therein in a substantially sealed, i.e. fluid-tight manner, except for the cases that will be described further hereinbelow, so that said second piston substantially behaves as a shutter as regards itsown cavity 11. - The crosswise dimensions of said first and second cavities, and therefore the
pistons first cavity 5 has a cross-section area B that is larger than the cross-section area A of thesecond cavity 11, as this is illustrated schematically in Figures 3 and 4. - In practice, in the plane "s", where said two cavities join each other with the planar faces thereof, the face of the
second cavity 11 fits into the face of thefirst cavity 5. - In the preceding description, said cavities and the related pistons have been described as cylindrical elements. Now, such indication is usually given while implying that the talk is about circular cylinders; in this particular case, however, it should be specially noticed that these cylindrical figures must be understood in the broadest meaning thereof, i.e. as formed by the movement, that may not be a circular one, of a segment that moves constantly parallel to and about a fixed segment or axis.
- On the surface of the
second piston 12 are provided twogrooves piston 12 within therelated cavity 11, they communicate with each other. - This requirement can be complied with in a number of manners: a first manner is to provide a single
annular groove 14 in the outer surface of thepiston 12, so that said two distinct6 grooves can be considered as being simple sub-portions of said singleannular groove 14, as this is symbolically illustrated in Figure 5; or between said two physically and actually separatedgrooves conduit 19 that connects them to each other in a permanent manner, as this is best illustrated in Figure 6. - There are three distinct conduits provided in the
outer body 4, wherein afirst conduit 20 connects the chamber of thefirst cavity 5, as also comprised between said twopistons first port 21 provided in the surface of saidsecond cavity 11; asecond conduit 22 connects a source of compressedgas 23, usually compressed air, with asecond port 24, which is also provided in the outer surface of the same second cavity; and athird conduit 25 connects the outside withy athird port 26 that is again provided in the surface of saidsecond cavity 11. - Furthermore, the first two
ports second piston 12 can move into both: - a first position (Figure 2), in which said two
ports groove 14, while thethird port 25 is on the contrary closed by the surface of thesecond cavity 11, and - a second position (Figure 8), in which the
first port 21 is still open into thefirst groove 14, while thesecond port 24 is plugged by the second piston and thethird port 26 associated to thethird conduit 25 is set into communicating with saidsecond groove 15. - Furthermore, by means of
tie rods drive plate 6 is rigidly connected to thesecond plate 7, which is so sized and arranged, relative to thesecond piston 12, as to ensure that, when saidrod 2 is pushed outwards, thesecond plate 7 pushes in turn the outer portion of saidsecond piston 12 towards the interior of theouter body 4, owing to saidrod 2, saidfirst plate 6, saidtie rods second plate 7 being appropriately linked together. - It can however be readily appreciated that the correct arrangement and sizing of both stationary and movable elements and members involved relative to each other must be such as to enable the following four operating modes, which shall be referred to as settings hereinbelow, to occur in an orderly and mutually exclusive manner, wherein to each such setting there correspond a respective univocal combination of the positions of the two movable members, i.e.:
- assembly comprised of rod,
first piston 9, movable plates, etc., -
second piston 12. - As a result, since no pressure exists within the cavity between the two pistons, the
first piston 9 stops moving, thereby putting an end to the first stroke distance thereof. - In addition, an
elastic spring 30, which is suitably provided in the remaining portion (not comprised between the pistons) of the first cavity, and which is no longer contrasted by the pressure acting upon the first piston at this point, starts urging the latter into moving in the opposite direction.
Fourth setting (Figure 9): said first piston continues moving in the opposite direction, until theface 33 thereof comes into abutting against theface 34 of the second piston, thereby pushing it inwards, i.e. towards the interior of the respective cavity thereof, while thesecond conduit 22 continues to be plugged. - From this moment on, the process goes on with the
first piston 9 that keeps moving to eventually push thesecond piston 12 into the initial position thereof and, when this position is eventually reached, thethird conduit 25 is plugged again and thesecond conduit 22 is opened again, thereby restoring the initial conditions of the first setting, from which the cycle then starts again to go on in an iterative and automatic manner. - At this point, it can therefore be fully and readily appreciated that, in practice, the motion of the whole apparatus is substantially due to the reciprocating movement of the first piston, which is alternately exposed to a pneumatic force on a side and an opposite force (the spring 30) on the other side, thereby behaving like a double-acting piston.
- As a result, the need of having two distinct pistons working alternately in the opposite direction can be advantageously done away with, since - according to the present invention - the
first piston 9 performs and ensures both alternating movements in opposite directions. - Various improvements are furthermore allowed for within the scope of the present invention. So, for instance, and with reference to Figure 10, the cavity 45 - instead of being partially occupied by the spring 30 - is allowed to communicate, via a
suitable channel 47, with a source of compressed gas (not shown), so that the elastic countering action of theelastic spring 30 is in this case replaced with the pressure exerted by said compressed gas against theopposing face 10 of the first piston lying therebehind. The advantage of such solution lies in the elimination of thespring 30, along with the largely known drawbacks connected therewith. In practice, thespiral spring 30 is replaced by the pneumatic force acting upon theface 10 of the first piston, thereby providing a gas spring of a conventional kind. - A further improvement is obtained if the pressure in said
cavity 45 is conveniently ensured by simply "tapping", i.e. drawing off pressure from thesecond conduit 22, from which there departs achannel 48, as this is symbolically illustrated in Figure 11. - In this case, the pressure in the
cavity 45 must of course be strictly prevented from dropping for any reason whatsoever, since this would affect the functionality of the above-described gas spring. To this purpose, acheck valve 49 is fitted in saidconduit 48 to prevent the pressure in thecavity 45 from being released, in particular in the transient phase between the third and the fourth setting. - It can further be readily appreciated that the pressure acting on the
side 10 of thefirst piston 9 will under no circumstance be sufficient, i.e. rise to a value enabling it to overcome the force being exerted upon thepiston 9 by the pressure acting against theopposite face 33, since, while the pressures on the two faces are the same, the surface area of theface 10 is clearly smaller than the surface area of theface 33, due to the presence of therod 2, on which no pressure is in fact exerted. - Anyway, in order to do away with the risk that, in the initial phase, the pressure onto the first piston proves inadequate, owing to the two pistons being "squeezed" against each other to such an extent as to prevent the gas from being able to act against the first piston itself, between the two pistons there is provided a
small spacing member 32, having an appropriately reduced diameter, preferably either on theface 33 of the first piston or theface 34 of thesecond piston 12. - Finally, in view of ensuring a specifically asymmetrical operation of the scrap ejector, i.e. a feature that is particularly desired or even plainly necessary in a number of applications, said
second conduit 22 and/or saidthird conduit 25 are provided with appropriateflow control valves - In a broader sense, the asymmetry in the operation of the scrap ejector may of course be ensured through a number of different means, and combinations thereof, i.e. by selecting and calibrating in an appropriate manner - as all those skilled in the art are anyway fully capable of doing - said
elastic spring 30, the ratio of the cross-section area of therod 2 to the cross-section area of thefirst piston 9, the adjustment or setting of either one or both saidvalves second conduit 22 andthird conduit 25 thereof, as the case may be. - Again with reference to Figure 12, a further simplification may be easily introduced in any of the above-described embodiments of the present invention if the
conduits cavity 45 are fully eliminated, while providing thesame cavity 45 in a fluid-tight construction, possibly pre-loaded with an initial bias pressure of such a value as to cause thefirst piston 9 to move back against thesecond piston 12 as soon as thethird conduit 25 is put in connection, i.e. is set into communicating with the portion of saidfirst cavity 5 comprised between the two pistons. - This solution stands out for its simplicity and functional reliability, further to being favoured by the fact that the current technology is such as to enable pneumatic springs - as is the case of the above-described solution - to be used, which are really capable of performing in an unaltered manner at a high level through millions and millions of operating cycles.
Second setting (Figure 7): said
Third setting (Figure 8): the first piston continues its stroke until causing the second plate to push the
Claims (11)
- Scrap ejector, comprising:- a pneumatic motor (1) driving a rod (2) into an axially reciprocating motion,- one or more drive plates (6, 7) attached to said rod (2) or adapted to move jointly therewith,- a slide-like plate (3) that is firmly joined to said drive plate(s),characterized in that said pneumatic motor comprises:- an outer body (4) that is provided internally with a first cylindrical cavity (5), in which there is accommodated a portion of said rod, and- an aperture (8), which connects said first cavity (5) with the outside, and through which said rod (2) is able to slidably pass,- a first piston (9), which is arranged to slide in a fluid-tight manner within said first cavity, and which is connected, with a face (10 thereof, with the inward-facing end portion of said rod (2),- a second cylindrical cavity (11) that is provided in said outer body (4) on the opposite side of said aperture (8), and that allows said first cavity to be set into communicating with the outside,- wherein the surface of said second cavity (11), at the common coupling intersection (s) in said first cavity, has an area (A) that is smaller than the area (B) of the surface of said first cavity (5) at the same common coupling intersection (s),- a second piston (12) that is at least partially accommodated in said second cylindrical cavity (11), and that is adapted to slidably reciprocate within such cavity, said second piston being physically distinct from said first piston (9).
- Scrap ejector according to claim 1, characterized in that, on two distinct and different portions of the cylindrical surface thereof, said second piston is provided with two respective grooves (14, 15), which are so arranged as to be able to communicate with each other (19) in any position whatsoever of the second piston within said second cavity.
- Scrap ejector according to claim 2, characterized in that in said outer body (4) there are provided:- a first conduit (20) that connects the chamber being substantially defined between said first cavity (5)- and said first piston (9),- and said second piston (12), with a first port (21) in the cylindrical wall of said second cavity (11),- a second conduit (22) that connects a source of gas (23) at a selectively controllable pressure with a second port (24) in the cylindrical wall of said second cavity,- and a third conduit (25) that connects the outside with a third port (26) in the cylindrical wall of said second cavity, wherein said first port (21) of said second cavity is situated in a position that is closer to said first piston than the position of said second port (24).
- Scrap ejector according to claim 3, characterized in that said second piston, said respective grooves thereof and said three conduits are so positioned and sized as to enable said second piston to move into:- a first position, in which said first conduit (20) is set in communication with said second conduit (22) via a first one (14) of said grooves, and the port (26) of said third conduit (25) is plugged by the outer cylindrical surface of said second piston (12),- a second position, in which said first conduit (20) keeps being connected with said first groove (14), and the port (24) of said second conduit is plugged by the outer cylindrical surface of said second piston (12), and said third conduit (25) is set in communication with the second one (15) of said two grooves (14, 15).
- Scrap ejector according to claim 4, characterized in that said drive plates (6, 7) are adapted to move into four distinct settings, and said two pistons (9, 12) are adapted to move into said respective positions, wherein:- in the first setting (Figure 2), said first piston is substantially in contact with said second piston, which is in the respective first preceding position,- in the second setting (Figure 7), said drive plates are displaced so that said first piston is moved to the farthest position from said second piston, which remains in the preceding position,- in the third setting (Figure 8), said plates are further displaced in the preceding direction, thereby causing said second piston to move into the second position thereof,- in the fourth setting (Figure 9), said plates (6, 7) have moved back to a position in which said first piston is again in contact with said second piston, which remains in the preceding second position thereof.
- Scrap ejector according to any of the preceding claims, characterized in that in the portion of said first cavity (5) accommodating said rod (2) there is arranged an elastic spring (30) that is adapted to act against said first piston (9).
- Scrap ejector according to any of the claims 1 to 5, characterized in that the portion (45) of said first cavity (5) accommodating said rod (2) is provided in a sealed construction and is kept at an adequate pressure so that said portion (45) and said first piston (9) perform as a pneumatic spring relative to each other.
- Scrap ejector according to any of the claims 1 to 5, characterized in that the portion (45) of said first cavity (5) accommodating said rod (2) is connected to a suitable supply channel (47) connected to a source of compressed gas.
- Scrap ejector according to claim 7, characterized in that said supply channel is a connection channel (48) between said first cavity containing the rod and said second conduit (22) connected to said source of gas under controllable pressure (23), a suitable check valve (49) being preferably fitted in said connection channel (48).
- Scrap ejector according to any of the preceding claims, characterized in that between said first and said second piston (9, 12) there is provided a spacing member (32) that is adapted to prevent the respective, mutually opposing surfaces of said pistons from coming into contact with each other, said spacing member being firmly attached to or integrally provided either on the face (33) of said first piston (9) or on the opposite face (34) of said second piston (12).
- Scrap ejector according to any of the claims 3 to 10, characterized in that in said second conduit (22) and/or said third conduit (25) there are provided respective selectively adjustable flow control means (51, 52).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPN20040020 ITPN20040020U1 (en) | 2004-11-25 | 2004-11-25 | VIBRATORY DEVICE FOR EVACUATING ARTICLES |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1661629A2 true EP1661629A2 (en) | 2006-05-31 |
EP1661629A3 EP1661629A3 (en) | 2011-08-03 |
EP1661629B1 EP1661629B1 (en) | 2012-07-04 |
Family
ID=35929069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20050110686 Active EP1661629B1 (en) | 2004-11-25 | 2005-11-14 | Vibratory apparatus for ejecting items |
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Country | Link |
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EP (1) | EP1661629B1 (en) |
ES (1) | ES2391736T3 (en) |
IT (1) | ITPN20040020U1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101758016A (en) * | 2010-02-11 | 2010-06-30 | 北京国电富通科技发展有限责任公司 | vibration exciter |
CN101537577B (en) * | 2009-04-24 | 2011-12-14 | 中国地质大学(武汉) | Electric-control liquid strike and excitation method and device for vibration cutting |
IT202100030968A1 (en) * | 2021-12-09 | 2023-06-09 | Bordignon S R L | PNEUMATIC MOTOR AND OBJECT CONVEYOR, PARTICULARLY TO EVACUATE WASTE |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4031812A (en) * | 1974-03-08 | 1977-06-28 | Nikolai Vasilievich Koshelev | Hydraulic vibrator for actuator drive |
US4142447A (en) * | 1976-06-24 | 1979-03-06 | Ingersoll-Rand Company | Hydraulic actuator |
AU514731B2 (en) * | 1977-12-02 | 1981-02-26 | Bron Dan | Reciprocating actuator |
EP0231406A2 (en) * | 1986-01-22 | 1987-08-12 | Inc. Vibro Industries | Asymmetrically accelerated vibrator for feeding materials |
US6318235B1 (en) * | 1999-06-04 | 2001-11-20 | Poclain Hydraulics Industrie | Hydraulic motor cylinder-capacity selector for avoiding jarring when switching from one cylinder capacity to another |
ITPN20010087A1 (en) * | 2001-12-14 | 2003-06-16 | Romeo Bordignon | WASTE EVACUATOR |
-
2004
- 2004-11-25 IT ITPN20040020 patent/ITPN20040020U1/en unknown
-
2005
- 2005-11-14 ES ES05110686T patent/ES2391736T3/en active Active
- 2005-11-14 EP EP20050110686 patent/EP1661629B1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4031812A (en) * | 1974-03-08 | 1977-06-28 | Nikolai Vasilievich Koshelev | Hydraulic vibrator for actuator drive |
US4142447A (en) * | 1976-06-24 | 1979-03-06 | Ingersoll-Rand Company | Hydraulic actuator |
AU514731B2 (en) * | 1977-12-02 | 1981-02-26 | Bron Dan | Reciprocating actuator |
EP0231406A2 (en) * | 1986-01-22 | 1987-08-12 | Inc. Vibro Industries | Asymmetrically accelerated vibrator for feeding materials |
US6318235B1 (en) * | 1999-06-04 | 2001-11-20 | Poclain Hydraulics Industrie | Hydraulic motor cylinder-capacity selector for avoiding jarring when switching from one cylinder capacity to another |
ITPN20010087A1 (en) * | 2001-12-14 | 2003-06-16 | Romeo Bordignon | WASTE EVACUATOR |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101537577B (en) * | 2009-04-24 | 2011-12-14 | 中国地质大学(武汉) | Electric-control liquid strike and excitation method and device for vibration cutting |
CN101758016A (en) * | 2010-02-11 | 2010-06-30 | 北京国电富通科技发展有限责任公司 | vibration exciter |
IT202100030968A1 (en) * | 2021-12-09 | 2023-06-09 | Bordignon S R L | PNEUMATIC MOTOR AND OBJECT CONVEYOR, PARTICULARLY TO EVACUATE WASTE |
EP4194706A1 (en) * | 2021-12-09 | 2023-06-14 | Bordignon S.r.l. | Pneumatic motor and object conveyor, in particular for removing scraps |
Also Published As
Publication number | Publication date |
---|---|
ES2391736T3 (en) | 2012-11-29 |
ITPN20040020U1 (en) | 2005-02-25 |
EP1661629B1 (en) | 2012-07-04 |
EP1661629A3 (en) | 2011-08-03 |
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