CN216264694U

CN216264694U - Passive centering clamp of passive form

Info

Publication number: CN216264694U
Application number: CN202122716100.2U
Authority: CN
Inventors: 李全普; 吴德强; 宁保锋
Original assignee: Lianzhi Dalian Intelligent Technology Co Ltd
Current assignee: Lianzhi Dalian Intelligent Technology Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-04-12
Anticipated expiration: 2031-11-08

Abstract

The utility model belongs to the technical field of hydrogen energy and lathe industries, and discloses a passive centering clamp. The device comprises a spiral spline wrapping mechanism, an offset cam mechanism, a push rod mechanism, a base assembly and a diameter fine adjustment assembly; the spiral spline mechanism is connected with the offset cam mechanism through a spiral spline, the spiral spline mechanism, the offset cam mechanism and the push rod mechanism are installed on the base assembly, the diameter fine adjustment assembly is installed at the front end of the push rod mechanism, and the push rod mechanism and the offset cam mechanism are arranged in a circumferential mode. The method realizes a completely passive and passive form, can effectively meet the coaxiality requirement of the workpiece and the main shaft, and does not influence the processing of any end face of the workpiece.

Description

Passive centering clamp of passive form

Technical Field

The utility model belongs to the technical field of hydrogen energy and lathe industries, and relates to automatic positioning equipment for large annular workpieces; the utility model relates to a passive centering fixture.

Background

The processing of large-scale circular ring type workpieces relates to various industries, such as heavy industry, ship industry, aerospace industry and the like. When a large-scale circular ring workpiece is used for machining an outer circle and an end face of a machine tool, the workpiece is clamped and placed on the machine tool and finally reaches the most important centering link, centering of the workpiece is particularly complex due to the fact that the workpiece is large in size, parts containing power sources cannot be used in a centering mechanism due to the fact that a lathe spindle needs to rotate for machining, and therefore the requirement for coaxiality of the workpiece and the lathe spindle is difficult to meet.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the background technology and provide a passive centering fixture, wherein a large circular workpiece is automatically centered on a machine tool spindle turntable, so that a completely passive and passive form is realized, the coaxiality requirement of the workpiece and a spindle can be effectively met, and meanwhile, the machining of any end face of the workpiece is not influenced.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a passive centering clamp comprises a spiral spline mechanism, an offset cam mechanism, a push rod mechanism, a base assembly and a diameter fine adjustment assembly; the spiral spline mechanism is connected with the offset cam mechanism through a spiral spline, the spiral spline mechanism, the offset cam mechanism and the push rod mechanism are installed on the base assembly, the diameter fine adjustment assembly is installed at the front end of the push rod mechanism, and the push rod mechanism and the offset cam mechanism are arranged in a circumferential mode.

The push rod mechanisms are circumferentially arranged in three. The offset cam mechanisms are circumferentially arranged in three.

The spiral spline mechanism comprises a pressing cap, a spiral spline shaft, a spline guide shaft, a longitudinal reset spring and a limiting gasket; the pressure cap is installed at spiral spline axle top, and the spline guiding axle passes through the mounting screw on the bottom plate of base subassembly, and vertical reset spring installs in the both sides of spline guiding axle, and spline guiding axle upper end is established in spiral spline axle and spline guiding axle top is connected with spacing gasket, and spacing gasket is installed on the spline guiding axle. The top ends of the longitudinal return springs on the two sides of the spline guide shaft are arranged inside the spiral spline shaft.

The offset cam mechanism comprises an inner spiral spline sleeve, an outer bearing chamber, an offset cam, a deep groove ball bearing, a thrust bearing and an inner bearing chamber; the inner bearing chamber is arranged on the bottom plate, the inner spiral spline sleeve and the offset cam are respectively connected with the upper end and the lower end of the outer bearing chamber together, the outer bearing chamber is arranged on the outer side of the inner bearing chamber through a pair of deep groove ball bearings, and the offset cam is pressed on the inner bearing chamber through a thrust bearing.

The push rod mechanism includes: the main push rod, the main guide sleeve, the connecting rod piece, the linear bearing, the horizontal return spring, the auxiliary push rod and the roller; the main push rod is inserted in the main guide sleeve, the main push rod and the auxiliary push rod are connected together through a connecting rod piece, the horizontal reset spring is arranged on the outer side of the auxiliary push rod, the linear bearing is arranged at the front end of the auxiliary push rod, and the roller is arranged at the rear end of the auxiliary push rod. The push rod mechanism is installed on the bottom plate of the base assembly.

The base component comprises a bottom plate and a base. Three bases arranged circumferentially are arranged below the bottom plate through screws.

The diameter fine adjustment component comprises a top head and a mandrel; the threaded end of the mandrel is arranged in the top and locked by a set screw, the optical axis end of the mandrel is arranged in an unthreaded hole of the main push rod, the threaded end and the optical axis end of the mandrel are matched to form H7/g6 clearance fit, a screw is arranged at the lower end of the diameter fine adjustment assembly, and the screw is arranged on the main push rod through a strip hole at the lower end of the top. The screw that diameter fine setting subassembly lower extreme was equipped with is used for adjusting and location dabber.

Compared with the prior art, the utility model has the beneficial effects that:

the passive centering fixture provided by the utility model has the following advantages compared with the prior art:

1. no power element exists in the structure; 2. the whole set of equipment is completely passive in operation, and can realize centering when a workpiece is placed on a machine tool; 3. the effective centering function can be met no matter the workpiece is a finished workpiece or a blank; 4. the adjustable centering device has an adjustable function, and can be used for centering each workpiece with a certain floating size; 6. the reliability and the easy maintenance nature of structure use the form that spiral spline and eccentric cam combined together, do not have the running noise, and centering takt time is short, and the means demand of routine maintenance is also extremely simple.

Drawings

The utility model is further illustrated with reference to the following figures and examples:

fig. 1 is a schematic structural view of a passive centering fixture according to the present invention.

Fig. 2 is a cross-sectional view of the helical spline mechanism.

FIG. 3 is a cross-sectional view of an offset cam mechanism.

Fig. 4 is a structural view of the push lever mechanism.

Fig. 5 is a view showing the structure of the base assembly.

FIG. 6 is a cross-sectional view of a diameter trim assembly.

Fig. 7 is a schematic view of the working state of the passive centering fixture of the present invention.

In the figure, 1, a spiral spline mechanism, 2, an offset cam mechanism, 3, a push rod mechanism, 4, a base assembly, 5, a diameter fine adjustment assembly, 6, a spiral spline shaft, 7, a spline guide shaft, 8, a longitudinal return spring, 9, an inner spiral spline sleeve, 10, an outer bearing chamber, 11, an offset cam, 12, a deep groove ball bearing, 13, a main guide sleeve, 14, a connecting rod piece, 15, a linear bearing, 16, a horizontal return spring, 17, a main push rod, 18, an auxiliary push rod, 19, a roller, 20, a top head, 21, a mandrel, 22, a base and 23, a bottom plate are arranged.

Detailed Description

The utility model is further described below with reference to the drawings attached to the specification, but the utility model is not limited to the following examples.

Example 1

A passive centering clamp is shown in figures 1-7 and comprises a spiral spline mechanism 1, an offset cam mechanism 2, a push rod mechanism 3, a base assembly 4 and a diameter fine adjustment assembly 5; the spiral spline mechanism 1 is connected with the offset cam mechanism 2 through a spiral spline, the spiral spline mechanism 1, the offset cam mechanism 2 and the push rod mechanism 3 are installed on the base component 4, the diameter fine adjustment component 5 is installed at the front end of the push rod mechanism 3, and the push rod mechanism 3 and the offset cam mechanism 2 are arranged in a circumferential mode.

Three push rod mechanisms 3 are arranged in a circumferential manner. Three offset cam mechanisms 2 are arranged in a circumferential manner.

The spiral spline mechanism 1 comprises a pressing cap 12, a spiral spline shaft 6, a spline guide shaft 7, a longitudinal return spring 8 and a limiting gasket 26; the pressure cap 12 is installed at the top of the spiral spline shaft 6 through screws, the spline guide shaft 7 is installed on the bottom plate 23 of the base assembly 4 through screws, the longitudinal reset spring 8 is installed on two sides of the spline guide shaft 7, the upper end of the spline guide shaft 7 is arranged in the spiral spline shaft 6, the top of the spline guide shaft 7 is connected with the limiting gasket 26, and the limiting gasket 26 is installed on the spline guide shaft 7 through screws. The top ends of the longitudinal return springs 8 on the two sides of the spline guide shaft 7 are arranged inside the spiral spline shaft 6.

The offset cam mechanism 2 comprises an internal spiral spline housing 9, an outer bearing chamber 10, an offset cam 11, a deep groove ball bearing 24, a thrust bearing 25 and an inner bearing chamber 27; the inner bearing chamber 27 is installed on the bottom plate 23 through screws, the inner spiral spline housing 9 and the offset cam 11 are respectively connected with the upper end and the lower end of the outer bearing chamber 10 through screws, the outer bearing chamber 10 is installed on the outer side of the inner bearing chamber 9 through a pair of deep groove ball bearings 24, and the offset cam 11 is pressed on the inner bearing chamber 27 through a thrust bearing 25.

The push rod mechanism 3 includes: a main push rod 17, a main guide sleeve 13, a connecting rod piece 14, a linear bearing 15, a horizontal return spring 16, an auxiliary push rod 18 and a roller 19; the main push rod 17 is inserted in the main guide sleeve 13, the main push rod 17 is connected with the auxiliary push rod 18 through the connecting rod part 14, the horizontal return spring 16 is arranged on the outer side of the auxiliary push rod 18, the linear bearing is arranged at the front end of the auxiliary push rod 18, and the roller 19 is arranged at the rear end of the auxiliary push rod 18. The pusher mechanism 3 is mounted on the base plate 23 of the base assembly 4.

The base assembly 4 comprises a bottom plate 23, a base 22. Three circumferentially arranged pedestals 22 are mounted below the bottom plate 23 by screws.

The diameter fine adjustment assembly 5 comprises a top head 20 and a mandrel 21; the threaded end of the mandrel 21 is arranged in the top head 20 and locked by a set screw, the optical axis end of the mandrel 21 is arranged in a smooth hole of the main push rod 17, the mandrel and the smooth hole are matched in a clearance fit of H7/g6, the lower end of the diameter fine adjustment component is provided with a screw, and the screw is arranged on the main push rod 17 through a long hole at the lower end of the top head 20. The lower end of the diameter fine adjustment assembly is provided with a screw for adjusting and positioning the mandrel 21.

Before the whole set of equipment is used, the equipment is required to be installed on a working rotary plane of a machining lathe, the passive centering fixture equipment and a machine tool working rotary table are adjusted to be in a coaxial state, and finally the passive centering fixture equipment and the machine tool working rotary table are fixed through screws.

The manipulator conveys a workpiece to a working rotary platform, after the workpiece is placed, the manipulator contacts with an upper plane of a top end pressing cap 12 of a spiral spline mechanism 1, the manipulator adopts the action of downward pressing, a spiral spline shaft 6 in the spiral spline mechanism 1 makes rectilinear motion for limiting rotation on a spline guide shaft 7 so as to drive an inner spiral spline sleeve 9 to make the rotary motion, so that the whole offset cam mechanism 2 makes the rotary motion, an arc curved surface pushes the whole push rod mechanism 3 to make rectilinear motion through a roller 19 in the rotation process of an offset cam 11, three arc curved surfaces of the offset cam 11 are arranged in a circle, so that the consistency of the rectilinear motion of the three sets of push rod mechanisms 3 is ensured, a set of diameter fine adjustment components 5 is arranged at the front ends of the three sets of push rod mechanisms 3, a top head 20 in the diameter fine adjustment components 5 can contact with an inner circular surface of the workpiece, and the workpiece eccentric to the rotary platform of the machine tool is pushed and moved to a coaxial position, when the workpiece is moved to a stop to indicate that the workpiece is positioned at an optimal position, at the moment, the manipulator retracts, the longitudinal return spring 8 in the spiral spline mechanism 1 pushes the spiral spline shaft 6 to an initial position, the offset cam mechanism 2 also rotates to the initial position according to the principle of spiral spline transmission in the moving process of the spiral spline shaft 6, and the horizontal return spring 16 in the push rod mechanism 3 pushes the three sets of push rod structures 3 back to the initial position. And the perfectly adjusted workpiece can be provided with a corresponding fixing clamp for processing production.

For different workpieces with small floating inner diameter, the diameter fine adjustment component 5 can be used for fine adjustment of the size, screws in a strip-shaped space at the lower end of the top head 20 are loosened, the nut on the mandrel 21 is twisted, the front and back adjustment of the top head 20 is achieved, when the required position is adjusted, the screws at the lower end of the top head 20 are locked, and finally the nuts are locked to one side of the main push rod 17, so that the adjustment is completed.

Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims

1. A passive centering fixture is characterized by comprising a spiral spline mechanism (1), a bias cam mechanism (2), a push rod mechanism (3), a base assembly (4) and a diameter fine adjustment assembly (5); spiral spline mechanism (1) is connected with offset cam mechanism (2) through the spiral spline, and spiral spline mechanism (1), offset cam mechanism (2), push rod mechanism (3) are installed on base subassembly (4), and the front end at push rod mechanism (3) is installed in diameter fine setting subassembly (5), and push rod mechanism (3) and offset cam mechanism (2) are the circumference and arrange the setting.

2. The passive centering fixture according to claim 1, wherein three push rod mechanisms (3) are circumferentially arranged; the offset cam mechanisms (2) are arranged in a circle in three.

3. The passive centering fixture of claim 1, wherein the helical spline mechanism (1) comprises a pressing cap (12), a helical spline shaft (6), a spline guide shaft (7), a longitudinal return spring (8) and a limiting gasket (26); the pressing cap (12) is installed at the top of the spiral spline shaft (6), the spline guide shaft (7) is installed on a bottom plate (23) of the base assembly (4), the longitudinal reset spring (8) is installed on two sides of the spline guide shaft (7), the upper end of the spline guide shaft (7) is arranged in the spiral spline shaft (6), the top of the spline guide shaft (7) is connected with the limiting gasket (26), and the limiting gasket (26) is installed on the spline guide shaft (7);

the top ends of the longitudinal return springs (8) on the two sides of the spline guide shaft (7) are arranged in the spiral spline shaft (6).

4. A passive centering fixture according to claim 1, wherein said offset cam mechanism (2) comprises an internally threaded spline housing (9), an outer bearing chamber (10), an offset cam (11), a deep groove ball bearing (24), a thrust bearing (25), an inner bearing chamber (27); an inner bearing chamber (27) is arranged on a bottom plate (23), an inner spiral spline sleeve (9) and an offset cam (11) are respectively connected with the upper end and the lower end of an outer bearing chamber (10), the outer bearing chamber (10) is arranged on the outer side of the inner bearing chamber (9) through a pair of deep groove ball bearings (24), and the offset cam (11) is pressed on the inner bearing chamber (27) through a thrust bearing (25).

5. A passive centering fixture according to claim 1, characterized in that said pusher mechanism (3) comprises: the device comprises a main push rod (17), a main guide sleeve (13), a connecting rod piece (14), a linear bearing (15), a horizontal return spring (16), an auxiliary push rod (18) and a roller (19); a main push rod (17) is inserted in the main guide sleeve (13), the main push rod (17) and an auxiliary push rod (18) are connected together through a connecting rod piece (14), a horizontal return spring (16) is arranged on the outer side of the auxiliary push rod (18), a linear bearing (15) is arranged at the front end of the auxiliary push rod (18), and a roller (19) is arranged at the rear end of the auxiliary push rod (18); the push rod mechanism (3) is arranged on a bottom plate (23) of the base component (4).

6. A passive centering fixture according to claim 2, characterized in that said base assembly (4) comprises a base plate (23), a base (22); three bases (22) which are arranged in a circle are arranged below the bottom plate (23).

7. A passive centering fixture according to claim 5, characterized in that the diameter trimming assembly (5) comprises a plug (20), a mandrel (21); the threaded end of the mandrel (21) is arranged in the top (20) and locked by a set screw, the optical axis end of the mandrel (21) is arranged in a unthreaded hole of the main push rod (17), a screw is arranged at the lower end of the diameter fine adjustment component (5), and the screw is arranged on the main push rod (17) through a long hole at the lower end of the top (20).