Mounting and closing-up device for joint self-lubricating bearing of aircraft support arm part

Abstract

The invention belongs to the field of aeronautical manufacturing, and relates to a mounting and closing-in device for a joint self-lubricating bearing of an aircraft support arm part. Comprising a support assembly which is fixed on a pressure main shaft and moves along with the main shaft; the base assembly is placed on the press machine working platform and moves along with the press machine working platform; the supporting assembly is arranged on the support assembly and the base assembly and used for clamping and positioning the support arm part; and the pressing die assembly is arranged between the support assembly and the base assembly and used for installing and closing up the joint self-lubricating bearing and the aircraft support arm part.

Description

Technical Field

[0001] The invention belongs to the field of aviation manufacturing and relates to an installation and closing device for a self-lubricating bearing joint of an aircraft support arm part. Background Art

[0002] Joint self-lubricating bearings can reduce friction, energy consumption and extend service life in complex movements, thus ensuring efficient and stable operation of mechanical systems. As one of the core components in the aviation and military industries, joint self-lubricating bearings are often used in the connection parts of aircraft structures. They bear huge loads and high torque transmission during the operation of the aircraft. Their performance directly affects the reliability and safety of the entire system.

[0003] Most of the aircraft parts installed with joint self-lubricating bearings are irregular arm parts. There is a certain angle of inclination during the installation process, which leads to different degrees of shaking and the risk of bearing disengagement due to uneven force on the main shaft during the operation of the aircraft. At the same time, since the installation and compression of aircraft parts are rigidly fixed and cannot be adjusted after being fixed and compressed, how to effectively install and compress the joint self-lubricating bearings and ensure that the no-load starting torque and axial push-out force after installation and compression are qualified are problems that need to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide an installation and closing device for the joint self-lubricating bearings of aircraft arm parts, which solves the problem of effective installation and closing of the joint self-lubricating bearings on aircraft arm parts and can be installed in place at one time. It is simple to operate and convenient to disassemble and assemble, and directly acts on the installation surface of the arm parts to ensure the correct posture of the action surface.

[0005] Technical Solution

[0006] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: providing an installation and closing device for self-lubricating bearings of aircraft arm parts, characterized in that: Figure 1 As shown, the device mainly includes four parts. The first part is the support assembly 1, which is fixed on the main shaft of the press and moves up and down following the movement of the main shaft; the second part is the base assembly 2, which is placed on the working platform of the press and is used to expand the working surface of the press, and is consistent with the movement of the workbench without relative displacement; the third part is the support assembly 3, and the support assembly 1 is respectively provided with several support assemblies 1 on the support assembly 1 and the base assembly 2, which are used for clamping and positioning of the arm parts; the fourth part is the closing die assembly 4, which is placed between the support assembly 1 and the base assembly 2, and is used for the installation and closing of joint self-lubricating bearings and aircraft arm parts.

[0007] The support assembly 1 mainly includes a clamp assembly 5, an upper pressure block assembly 6, a hexagon socket head screw 7 (M12×35GB70-2000), a cylindrical pin 8 (A8×40GB119-86), a hexagon socket head screw 9 (M12×50GB70-2000), and a gasket 10 (12GB97.1-85). It is characterized by one clamp assembly 5, one upper pressure block assembly 6, four hexagon socket head screws 7, two cylindrical pins 8, three hexagon socket head screws 9, and three gaskets 10.

[0008] The clamp assembly 5 includes a fixed clamp 11, a movable clamp 12, a hexagon socket head screw 13, and an anti-injury pad 14. It is characterized in that there is one fixed clamp 11, one movable clamp 12, two hexagon socket head screws 13, and two anti-injury pads 14; the anti-injury pads 14 are respectively attached to the inner rings of the fixed clamp 11 and the movable clamp 12, which are used to protect the main shaft of the press, and are connected and fixed to the main shaft of the press through two hexagon socket head screws 13.

[0009] The upper pressure block assembly 6 includes an upper template 15, an upper pad 16, a hexagon socket head screw 9 (M12×50GB70-2000), a cylindrical pin 8 (A8×40GB119-86), and a straight handle 17 (M10×100GB4141.3-84). It is characterized by one upper template 15, one upper pad 16, three hexagon socket head screws 9, two cylindrical pins 8, and four straight handles 17; three hexagon socket head screws 9 are arranged on the upper pad 16 with the cylindrical end surface as the largest envelope surface, distributed in a triangular shape, and used for connecting the upper template 15 and the upper pad 16; and two cylindrical pins 8 are arranged along the axial direction of the upper pad 16, and the center line of the two cylindrical pins passes through the center of the upper pad, which is used for radial positioning of the upper template 15 and the upper pad 16; the straight handle 17 is installed on the outer circumferential surface of the upper template 15 through a threaded connection, and the four straight handles are symmetrical, which is convenient for operators to install the support assembly 1.

[0010] Furthermore, the fixed clamp 11 in the clamp assembly 5 is connected to the upper template 15 of the upper pressing block assembly 6 by four evenly distributed hexagon socket head screws 7; and two cylindrical pins 8 are respectively arranged between the first and second, third and fourth hexagon socket head screws 7 to fix the positioning of the clamp 11 and the upper template 15;

[0011] Furthermore, the movable clamp 12 in the clamp assembly 5 and the upper template 15 of the upper pressure block assembly 6 are connected and fixed by three evenly distributed groups of hexagon socket head screws 9 and gaskets 10; the fixing hole of the movable clamp 12 is set as a U-shaped hole to facilitate the adjustment of the relative position.

[0012] The base assembly 2 mainly includes a lower template 18, a lower pad 19, a hexagon socket head screw 9 (M12×50GB70-2000), a cylindrical pin 8 (A8×40GB119-86), and a straight handle 17 (M10×100GB4141.3-84). It is characterized by one lower template 18, one lower pad 19, three hexagon socket head screws 9, two cylindrical pins 8, and four straight handles 17; the position distribution and function of the hexagon socket head screw 9 and the cylindrical pin 8 on the lower pad 19 are the same as those of the upper pad 16; the straight handle 17 is installed at the cross-symmetrical position of the outer cylindrical surface of the lower template 18 through a threaded connection, which is convenient for the operator to place the base assembly 2 in the center of the press workbench.

[0013] The lower template 18 is used to expand and transform the work surface, and the size of the work surface is determined comprehensively according to the size of the arm parts; the contact surface with the work table is a fine-machined surface, and the flatness and smoothness requirements are the same as the work table to ensure the processing accuracy of the parts.

[0014] The support assembly 3 mainly includes a support screw 20 and a polyurethane elastomer 21, and is characterized in that the support screw 20 and the polyurethane elastomer 21 are connected through a hole-shaft fit, and are used for supporting and positioning arm-like parts during the installation and closing process.

[0015] The support rod 20 is a stepped shaft, one end of which is provided with an external thread for screwing the upper template 15 of the upper pressure block assembly 6 or the lower template 18 of the base assembly 2, and adjusting the height of the arm-like parts to ensure the state of the arm parts when the installation is in the closed state; the other end is a cylindrical shaft for passing through the polyurethane elastomer 21, and its height is about 1 / 2 to 2 / 3 of the height of the polyurethane elastomer 21; four planes are cut along the circumference of the middle part in the cross-symmetrical direction, and center holes are set along the same cross-section, and the center holes are connected in pairs, which is convenient for adjusting the tightness of the thread when adjusting the height, and also convenient for adjusting the height of the parts with the help of external force.

[0016] The polyurethane elastomer 21 is cylindrical with a central hole, the diameter of which matches the cylindrical axis of the support rod 20, and directly acts on the support arm parts to protect the parts.

[0017] The retracting die assembly 4 mainly includes an upper retracting die 22, a lower retracting die 23, and a positioning core rod 24. Its characteristic is that the positioning core rod 24 passes through the upper retracting die 22, the joint self-lubricating bearing of the arm-type parts, and the lower retracting die 23 in sequence, and is located between the support assembly 1 and the base assembly 2 to meet the axial push-out force requirements after installation and retracting.

[0018] The upper pressing die 22 and the lower pressing die 23 are both cylindrical with a center hole, and the diameter of the center hole is the same as the inner hole of the joint self-lubricating bearing; the height of the cylinders is the same, which is used to ensure that the joint self-lubricating bearing is installed in the center of the hole position of the support arm part; the connecting surface with the joint self-lubricating bearing is set with a pressing angle according to needs (when pressing on both sides, the upper pressing die 22 and the lower pressing die 23 are both set with a pressing angle; when pressing on one side, only the upper pressing die 22 or the lower pressing die 23 that contacts the pressing side of the joint self-lubricating bearing is set with a pressing angle), generally, the inner pressing angle α is 18°~25°, and the outer pressing angle β is 50°~55°.

[0019] The positioning core rod 24 is a rod-shaped structure, which is used for connecting the upper and lower retracting dies 22 and 23 with the arm parts. Its diameter is the same as the inner hole of the joint self-lubricating bearing; its height is the sum of the height values ​​of the upper and lower retracting dies 22, the joint self-lubricating bearing and the lower retracting die 23; one end is set with a taper of about 10° to facilitate the positioning core rod 4 to pass through the upper and lower retracting dies 22, 23 and the parts.

[0020] The upper pad 16 and the lower pad 19 are respectively provided with center holes to ensure the passage of the positioning core rod 24, so as to prevent the positioning core rod 24 from being blocked due to a certain assembly margin during the installation and pressing process, resulting in the support component 1 and the base component 2 being unable to move and unable to be effectively installed.

[0021] The upper template 15 and the lower template 18 are generally 25mm-30mm thick, which can not only ensure the installation of the support assembly 3, but also be used to level the height of the arm parts. At the same time, according to the size of the joint self-lubricating bearing installation parts, multiple threaded holes can be prefabricated at the relative positions of the upper template 15 and the lower template 18 for the installation of the joint self-lubricating bearing on the arm parts or other parts.

[0022] The present invention provides a mounting and closing device for a self-lubricating bearing of a joint of an aircraft arm-type part. Compared with the prior art, the present invention has the following beneficial effects:

[0023] ① The support assembly 1 is connected to the main shaft of the press, and the base assembly 2 is connected to the workbench of the press, so that the device and the press become a whole, the pressure is balanced, the difference is reduced, and the consistency of the output force value of the press and the actual force value is ensured during the bearing installation and pressure collection process;

[0024] ② The support assembly 3 is connected to the support assembly 1 and the base assembly 2 respectively. By adjusting the height of the parts, the placement posture of the parts is ensured, and the bearing installation has a certain angle or is not in the middle position due to the tilt of the parts, which further affects the performance of the axial push-out force and no-load starting torque;

[0025] ③ Strong versatility. When installing and closing bearings of different models, only the pressing die assembly 4 needs to be replaced. When installing and closing parts of different structures, since the support assembly 3 is connected by a quick-release device and is easy to disassemble and assemble, only the installation position of the upper template 15 and the lower template 18 needs to be adjusted, and the interchangeability is good.

[0026] In summary, the present invention provides a device that is accurate in installation, simple in operation, convenient in assembly and disassembly, and highly versatile, and directly acts on the mounting surface of the arm parts, fundamentally solving the problem of effective installation and closing of the joint self-lubricating bearing on the aircraft arm parts and being able to be installed in place at one time, and at the same time solving the problem of the bearing being tilted and not in place due to the unstable placement of parts, the bearing performance cannot be guaranteed, and the large workload of assembly and disassembly, and the easy damage to the product. Through this device, risks are identified in advance during the bearing installation stage, the influence of human factors is reduced, product quality is guaranteed, the difficulty of operation is reduced, material and financial resources are saved, and the production cycle is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention includes 16 drawings, and the drawings and the descriptions of the drawings are as follows:

[0028] Figure 1 This is a schematic diagram of the structure of the closing device installed in the present invention;

[0029] Figure 2 It is a schematic diagram of the installation of the support assembly 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the installation of the clamp assembly 5 of the present invention;

[0031] Figure 4 This is an appearance diagram of the fixing clamp 11 of the present invention;

[0032] Figure 5 This is an outline diagram of the movable clamp 12 of the present invention;

[0033] Figure 6 This is a schematic diagram of the installation of the upper pressing block assembly 6 of the present invention;

[0034] Figure 7 It is the appearance diagram of the upper template 15 of the present invention;

[0035] Figure 8 It is the appearance diagram of the upper pad 16 and the lower pad 19 of the present invention;

[0036] Fig. 9 This is a schematic diagram of installing the base assembly 2 of the present invention;

[0037] Fig.10 It is the appearance diagram of the lower template 18 of the present invention;

[0038] Fig.11 This is a schematic diagram of the installation of the support assembly 3 of the present invention;

[0039] Fig.12 This is an outline diagram of the support screw 20 of the present invention;

[0040] Fig.13 It is the appearance diagram of the polyurethane elastomer 21 of the present invention;

[0041] Fig.14 This is a schematic diagram of the installation of the receiving die assembly 4 of the present invention;

[0042] Fig.15 It is the appearance diagram of the upper receiving die 22 and the lower receiving die 23 of the present invention;

[0043] Fig.16 It is the appearance diagram of the positioning core rod 24 of the present invention.

[0044] Among them: 1. Support assembly, 2. Base assembly, 3. Support assembly, 4. Retracting die assembly, 5. Clamp assembly, 6. Upper pressure block assembly, 7. Hexagon socket head screw (M12×35GB70-2000), 8. Cylindrical pin (A8×40GB119-86), 9. Hexagon socket head screw (M12×50GB70-2000), 10. Washer (12GB97.1 -85), 11. Fixed clamp, 12. Movable clamp, 13. Hexagon socket head screw, 14. Anti-injury pad, 15. Upper template, 16. Upper pad, 17. Straight handle (M10×100GB4141.3-84), 18. Lower template, 19. Lower pad, 20. Support screw, 21. Polyurethane elastomer, 22. Upper retracting die, 23. Lower retracting die, 24. Positioning core rod. DETAILED DESCRIPTION

[0045] A mounting and closing device for self-lubricating bearings of aircraft arm parts, characterized in that: Figure 1 As shown, the device mainly includes four parts. The first part is the support assembly 1, which is fixed on the main shaft of the press and moves up and down following the movement of the main shaft; the second part is the base assembly 2, which is placed on the working platform of the press and is used to expand the working surface of the press, and is consistent with the movement of the workbench without relative displacement; the third part is the support assembly 3, and the support assembly 3 is respectively arranged in several positions on the support assembly 1 and the base assembly 2, and is used for clamping and positioning of the arm parts; the fourth part is the closing die assembly 4, which is placed between the support assembly 1 and the base assembly 2, and is used for the installation and closing of joint self-lubricating bearings and aircraft arm parts.

[0046] The support assembly 1 mainly includes a clamp assembly 5, an upper pressure block assembly 6, a hexagon socket head screw 7 (M12×35GB70-2000), a cylindrical pin 8 (A8×40GB119-86), a hexagon socket head screw 9 (M12×50GB70-2000), and a gasket 10 (12GB97.1-85). It is characterized by one clamp assembly 5, one upper pressure block assembly 6, four hexagon socket head screws 7, two cylindrical pins 8, three hexagon socket head screws 9, and three gaskets 10.

[0047] The clamp assembly 5 includes a fixed clamp 11, a movable clamp 12, a hexagon socket head screw 13, and an anti-injury pad 14. It is characterized in that there is one fixed clamp 11, one movable clamp 12, two hexagon socket head screws 13, and two anti-injury pads 14; the anti-injury pads 14 are respectively attached to the inner rings of the fixed clamp 11 and the movable clamp 12, which are used to protect the main shaft of the press, and are connected and fixed to the main shaft of the press through two hexagon socket head screws 13.

[0048] The upper pressure block assembly 6 includes an upper template 15, an upper pad 16, a hexagon socket head screw 9 (M12×50GB70-2000), a cylindrical pin 8 (A8×40GB119-86), and a straight handle 17 (M10×100GB4141.3-84). It is characterized by one upper template 15, one upper pad 16, three hexagon socket head screws 9, two cylindrical pins 8, and four straight handles 17; three hexagon socket head screws 9 are arranged on the upper pad 16 with the cylindrical end face as the largest envelope surface, distributed in a triangular shape, and used for connecting the upper template 15 and the upper pad 16; and two cylindrical pins 8 are arranged along the diameter direction of the cylindrical end face of the upper pad 16, which are used for positioning the upper template 15 and the upper pad 16; the straight handle 17 is installed in the middle of the height direction of the upper template 15 and the cross-symmetrical position of the outer cylindrical surface through a threaded connection, which is convenient for operators to install the support assembly 1.

[0049] Furthermore, the fixed clamp 11 in the clamp assembly 5 is connected to the upper template 15 of the upper pressing block assembly 6 by four evenly distributed hexagon socket head screws 7; and two cylindrical pins 8 are respectively arranged between the first and second, third and fourth hexagon socket head screws 7 to fix the positioning of the clamp 11 and the upper template 15;

[0050] Furthermore, the movable clamp 12 in the clamp assembly 5 and the upper template 15 of the upper pressure block assembly 6 are connected and fixed by three evenly distributed groups of hexagon socket head screws 9 and gaskets 10; the fixing hole of the movable clamp 12 is set as a U-shaped hole to facilitate the adjustment of the relative position.

[0051] The base assembly 2 mainly includes a lower template 18, a lower pad 19, a hexagon socket head screw 9 (M12×50GB70-2000), a cylindrical pin 8 (A8×40GB119-86), and a straight handle 17 (M10×100GB4141.3-84). It is characterized by one lower template 18, one lower pad 19, three hexagon socket head screws 9, two cylindrical pins 8, and four straight handles 17; the position distribution and function of the hexagon socket head screw 9 and the cylindrical pin 8 on the lower pad 19 are the same as those of the upper pad 16; the straight handle 17 is installed in the middle of the height direction of the lower template 18 and the cross-symmetrical position of the outer cylindrical surface through a threaded connection, so that the operator can place the base assembly 2 in the center of the press workbench.

[0052] The lower template 18 is used to expand and transform the work surface, and the size of the work surface is determined comprehensively according to the size of the arm parts; the contact surface with the work table is a fine-machined surface, and the flatness and smoothness requirements are the same as the work table to ensure the processing accuracy of the parts.

[0053] The support assembly 3 mainly includes a support screw 20 and a polyurethane elastomer 21, and is characterized in that the support screw 20 and the polyurethane elastomer 21 are connected through a hole-shaft fit, and are used for supporting and positioning arm-like parts during the installation and closing process.

[0054] The support rod 20 is a stepped shaft, one end of which is provided with an external thread for screwing the upper template 15 of the upper pressure block assembly 6 or the lower template 18 of the base assembly 2, and adjusting the height of the arm-like parts to ensure the state of the arm parts when the installation is in the closed state; the other end is a cylindrical shaft for passing through the polyurethane elastomer 21, and its height is about 1 / 2 to 2 / 3 of the height of the polyurethane elastomer 21; four planes are cut along the circumference of the middle part in the cross-symmetrical direction, and center holes are set along the same cross-section, and the center holes are connected in pairs, which is convenient for adjusting the tightness of the thread when adjusting the height, and also convenient for adjusting the height of the parts with the help of external force.

[0055] The polyurethane elastomer 21 is cylindrical with a central hole, the diameter of which matches the cylindrical axis of the support rod 20, and directly acts on the support arm parts to protect the parts.

[0056] The retracting die assembly 4 mainly includes an upper retracting die 22, a lower retracting die 23, and a positioning core rod 24. Its characteristic is that the positioning core rod 24 passes through the upper retracting die 22, the joint self-lubricating bearing of the arm-type parts, and the lower retracting die 23 in sequence, and is located between the support assembly 1 and the base assembly 2 to meet the axial push-out force requirements after installation and retracting.

[0057] The upper pressing die 22 and the lower pressing die 23 are both cylindrical with a center hole, and the diameter of the center hole is the same as the inner hole of the joint self-lubricating bearing; the height of the cylinders is the same, which is used to ensure that the joint self-lubricating bearing is installed in the center of the hole position of the support arm part; the connecting surface with the joint self-lubricating bearing is set with a pressing angle according to needs (when pressing on both sides, the upper pressing die 22 and the lower pressing die 23 are both set with a pressing angle; when pressing on one side, only the upper pressing die 22 or the lower pressing die 23 that contacts the pressing side of the joint self-lubricating bearing is set with a pressing angle), generally, the inner pressing angle α is 18°~25°, and the outer pressing angle β is 50°~55°.

[0058] The positioning core rod 24 is a rod-shaped structure, which is used for connecting the upper and lower retracting dies 22 and 23 with the arm parts. Its diameter is the same as the inner hole of the joint self-lubricating bearing; its height is the sum of the height values ​​of the upper and lower retracting dies 22, the joint self-lubricating bearing and the lower retracting die 23; one end is set with a taper of about 10° to facilitate the positioning core rod 4 to pass through the upper and lower retracting dies 22, 23 and the parts.

[0059] The upper pad 16 and the lower pad 19 are respectively provided with center holes to ensure the passage of the positioning core rod 24, so as to prevent the positioning core rod 24 from being blocked due to a certain assembly margin during the installation and pressing process, resulting in the support component 1 and the base component 2 being unable to move and unable to be effectively installed.

[0060] The upper template 15 and the lower template 18 are generally 25mm-30mm thick, which can not only ensure the installation of the support assembly 3, but also be used to level the height of the arm parts. At the same time, according to the size of the joint self-lubricating bearing installation parts, multiple threaded holes can be prefabricated at the relative positions of the upper template 15 and the lower template 18 for the installation of the joint self-lubricating bearing on the arm parts or other parts.

[0061] The operation process is as follows:

[0062] Manufacturing all parts of the present invention;

[0063] ② Install the support assembly 1, put the fixed clamp 11 and the movable clamp 12 on the main shaft of the press, and fix them on the main shaft of the press by the hexagon socket head screw 13;

[0064] ③Install the base assembly 2 and place it in the center of the press workbench;

[0065] ④ The die assembly 4 connects the part to the press, and finally the height of the part is leveled by the support assembly 3;

[0066] ⑤During the operation, the movement of the press spindle and the base drives the device to move up and down to complete the installation and pressing of the bearing;

[0067] ⑥ After the operation is completed, adjust the support assembly 3, remove the parts from the receiving die assembly 4, and disassemble the device.

Claims

1. A mounting and closing device for self-lubricating bearings of aircraft arm parts, characterized in that: include: A support assembly is fixed on the pressure spindle and moves with the spindle; The base assembly is placed on the working platform of the press and moves with the working platform of the press; A support assembly, arranged on the support assembly and the base assembly, and used for clamping and positioning the arm parts; The closing die assembly is arranged between the support assembly and the base assembly, and is used for installing and closing the joint self-lubricating bearings and aircraft support arm parts.

2. The device according to claim 1, characterized in that The support assembly includes: a clamp assembly and an upper pressure block assembly; The clamp assembly is fixedly connected to the main shaft of the press, and the upper pressing block assembly is fixed below the clamp assembly.

3. The device according to claim 2, characterized in that: The clamp assembly includes a fixed clamp and a movable clamp; The fixed clamp and the movable clamp are both semicircular plates, and the inner end surface of the semicircular plate is provided with an upper flange; The fixed clamp and the movable clamp are screwed together by passing a screw through the upper flange, so that the fixed clamp and the movable clamp can lock the main shaft of the press.

4. The device according to claim 3, characterized in that: The upper pressing block assembly includes: an upper template, an upper pad, a cylindrical pin, and a straight handle; The upper template and the upper spacer are fixed by three screws arranged in a triangular shape; The cylindrical pin passes through the upper template and the upper pad in the axial direction for positioning between the two; Four straight handles are symmetrically installed on the outer circumference of the upper template.

5. The device according to claim 4, characterized in that The fixing clamp is connected to the upper template by a plurality of evenly distributed screws, and cylindrical pins are also provided on the fixing clamp and the upper template for positioning; The movable clamp is connected to the upper template by screws, and the fixing hole on the movable clamp is an oblong hole for adjusting the position of the movable clamp.

6. The device according to claim 5, characterized in that The base assembly includes a lower template and a lower pad; the lower template and the lower pad are fixed by three screws arranged in a triangular shape; The cylindrical pin passes through the lower template and the lower pad in the axial direction for positioning between the two; Four straight handles are symmetrically installed on the outer circumference of the lower template; The flatness and smoothness of the contact surface between the lower template and the press table are machined to be the same as those of the press table.

7. The device according to claim 6, characterized in that The support assembly includes a support screw and an elastic body, which are matched through a hole shaft; The supporting screw is a stepped shaft, one end of which is provided with an external thread to be screwed to the upper or lower template, and the other end is a cylindrical shaft, the middle circumference surface is symmetrically cut with four planes, and a through hole is provided between two symmetrical planes; The elastic body is inserted into the cylindrical shaft.

8. The device according to claim 7, characterized in that The retracting die assembly comprises: an upper retracting die, a lower retracting die and a positioning core rod; The positioning core rod passes through the upper retracting die, the joint self-lubricating bearing of the arm part, and the lower retracting die in sequence; The two ends of the positioning core rod are inserted into the central through holes of the upper and lower cushion blocks.

9. The device according to claim 8, characterized in that The upper compression die and the lower compression die are both cylindrical structures with a center hole, and the diameter of the center hole is the same as the inner hole size of the joint self-lubricating bearing; A pressure point angle is set on the connection surface with the joint self-lubricating bearing, the inner pressure angle α is 18° to 25°, and the outer pressure angle β is 50° to 55°.

10. The device according to claim 9, characterized in that One end of the positioning mandrel is provided with a 10° taper.

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