Lathe with concentric clamp

Abstract

The invention relates to a lathe with a concentric clamp, relates to the technical field of lathes, and aims to solve the problem that turning steps of workpieces are tedious. The lathe with the concentric clamp comprises a machine body used for machining a workpiece, a mounting base is arranged on the machine body, a clamping part used for clamping the workpiece is rotationally arranged on the mounting base, and a driving assembly used for driving the mounting base to move in the length direction of the machine body is arranged on the machine body. The turning device has the effect of improving the turning machining efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of lathes, and in particular to a lathe with a concentric clamp. Background Art

[0002] Lathe is the most important type of metal cutting machine tool; generally, a rotatable three-jaw chuck or other fixture is used to fix the workpiece on the lathe, and then a turning tool is used to turn the rotating workpiece.

[0003] In the related art, a shaft workpiece is provided with a circular hole with high precision requirements inside; therefore, when turning the circular hole, it is necessary to use a three-jaw chuck to fix the shaft workpiece to ensure stable rotation of the shaft so as to cooperate with the turning tool to turn a high-precision circular hole; and before turning the circular hole, it is necessary to first machine a surface with sufficient roundness on the outer circumference of the shaft to ensure stable rotation of the shaft during machining.

[0004] In addition, after the circular hole is opened in the shaft workpiece, the shaft workpiece and the three-jaw pulling plate need to be separated, and then a blind head is heat-fitted on the end of the shaft workpiece to fix it; however, the blind head fixed by heat processing is prone to deformation of the shaft workpiece. Therefore, after fixing the blind head, it is necessary to use a three-jaw chuck to fix the shaft workpiece, and then the outer circumference of the shaft should be processed for roundness again to facilitate subsequent processing.

[0005] With respect to the above-mentioned related technologies, the inventors found that during the processing of the shaft workpiece, the three-jaw chuck and the shaft workpiece need to be repeatedly disassembled and installed, which is not convenient for rapid axial positioning of the shaft workpiece. The overall processing steps are cumbersome and inefficient, so it needs to be improved. Summary of the invention

[0006] In order to improve the efficiency of turning processing, the present application provides a lathe with a concentric fixture.

[0007] The present application provides a lathe with a concentric fixture adopts the following technical solution: A lathe with a concentric clamp comprises a body for processing a workpiece, a mounting seat is arranged on the body, a clamping part for clamping the workpiece is rotatably arranged on the mounting seat, and a driving assembly is arranged on the body for driving the mounting seat to move along the length direction of the body.

[0008] By adopting the above technical scheme, the clamping part is used to clamp the workpiece to be processed, and the driving component is used to drive the mounting seat to drive the clamping part and the workpiece to move, so as to facilitate turning and blinding of the workpiece, thereby simplifying the processing process of continuous disassembly and assembly of the workpiece and the three-jaw chuck; there is no need to process the outer peripheral side of the shaft workpiece to ensure the accuracy of circular hole processing, which reduces the process and improves processing efficiency.

[0009] Preferably, the clamping portion comprises a rotating ring, an extension portion, a driving gear ring, a mounting ring and several groups of clamping blocks; a mounting opening is provided inside the mounting seat for allowing a workpiece to pass through, the rotating ring is rotatably arranged inside the mounting opening, the extension portion is arranged on the side wall of the rotating ring, and the driving gear ring is sleeved on the extension portion to drive the rotating ring to rotate; the mounting ring is arranged inside the mounting opening, and the rotating ring and the mounting ring are arranged coaxially; the mounting ring is provided with several groups of sliding notches on the side wall facing the rotating ring for allowing the clamping blocks to slide, each of the clamping blocks is slidably arranged inside the sliding notch, and all of the clamping blocks are distributed at intervals along the circumference of the mounting ring; a spiral groove is provided on the side wall of the rotating ring facing the clamping block, and each of the clamping blocks is provided with a tooth pattern meshing with the spiral groove on the side wall facing the rotating ring, so as to drive all the clamping blocks to move away from or approach each other.

[0010] By adopting the above technical solution, the user drives the driving gear ring to drive the extension part and the rotating ring to rotate, and utilizes the meshing transmission of the spiral groove and the tooth pattern to make all the clamping blocks move closer to each other or move away from each other, so as to clamp and fix or loosen and remove the workpiece passing through.

[0011] Preferably, a toggle rod is inserted into the side wall of the driving gear ring, and the driving gear ring is provided with a plurality of groups of card interfaces for the toggle rod to be engaged, and all the card interfaces are distributed at intervals along the circumference of the driving gear ring.

[0012] By adopting the above technical solution, the toggle rod is inserted into the corresponding card interface to drive the driving gear ring to rotate. The toggle rod increases the force arm of the user to drive the driving gear ring to rotate, so that the user can drive the driving gear ring to rotate more conveniently and labor-savingly, thereby improving the convenience of use of the clamping part.

[0013] Preferably, the driving assembly includes a sliding table, a driving screw and a driving motor; the sliding table is slidably arranged on the machine body along the length direction of the machine body, and the sliding table is connected to the mounting seat; the driving screw is rotatably arranged on the machine body, and the length direction of the driving screw is parallel to the length direction of the machine body; the driving screw passes through the sliding table, and the driving screw is threadedly connected to the sliding table; the driving motor is arranged at one end of the machine body to drive the driving screw to rotate.

[0014] By adopting the above technical solution, the output end of the driving motor drives the driving screw to rotate, and the rotating driving screw transmits to the sliding table, so that the sliding table drives the mounting sleeve, the clamping part and the workpiece to be processed to move, thereby facilitating the blind head processing of the workpiece.

[0015] Preferably, an auxiliary support component is provided on the machine body for auxiliary supporting the workpiece.

[0016] By adopting the above technical solution, the auxiliary support component provides auxiliary support for the workpiece, reducing the phenomenon of the clamping part alone clamping and supporting the workpiece and causing shaking, thereby ensuring stable processing of the workpiece.

[0017] Preferably, the auxiliary support assembly includes an auxiliary support plate, several groups of balls, a positioning seat and an adjusting member; the auxiliary support plate is arranged on the machine body, and the side wall of the auxiliary support plate away from the machine body can be against the workpiece; all the balls are rotatably arranged on the side wall of the auxiliary support plate away from the machine body to support the workpiece; the positioning seat is arranged on the machine body, and the positioning seat is located between the auxiliary support plate and the machine body, and the adjusting member is arranged between the positioning seat and the auxiliary support plate to adjust the distance between the auxiliary support plate and the positioning seat.

[0018] By adopting the above technical solution, the ball reduces the friction between the workpiece and the auxiliary support plate, reduces the wear of the auxiliary support plate on the workpiece during the rotation of the workpiece, and ensures stable and high-quality processing of the workpiece; the adjusting part adjusts the distance between the auxiliary support plate and the positioning seat to facilitate auxiliary support for workpieces of different diameters, thereby increasing the practicality of the overall device.

[0019] Preferably, the adjusting member comprises several groups of guide rods, adjusting screws, adjusting screw sleeves, adjusting gear rings, rotating gears and rotating motors; all the guide rods are arranged on the side wall of the auxiliary support plate facing the positioning seat, all the guide rods are distributed at intervals along the circumference of the auxiliary support plate, and the end of each guide rod away from the auxiliary support plate passes through the positioning seat; the adjusting screw is rotatably arranged on the side wall of the auxiliary support plate facing the positioning seat, and the adjusting screw sleeve is rotatably arranged on the positioning seat; the end of the adjusting screw away from the auxiliary support plate passes through the adjusting screw sleeve, and the adjusting screw is threadedly connected to the adjusting screw sleeve; the adjusting gear ring is sleeved on the adjusting screw sleeve, the rotating gear is rotatably arranged on the positioning seat, and the rotating gear and the adjusting gear ring are meshed with each other; the rotating motor is arranged on the positioning seat to drive the rotating gear to rotate.

[0020] By adopting the above technical scheme, the guide rod guides the moving direction of the auxiliary support plate, the output end of the rotating motor drives the rotating gear to rotate, the rotating gear engages with the adjusting gear ring for transmission, and drives the adjusting screw sleeve to rotate, and the rotating adjusting screw sleeve drives the adjusting screw to move along the axial direction of the adjusting screw sleeve, thereby adjusting the distance between the auxiliary support plate and the positioning seat, so as to facilitate auxiliary support for workpieces of different diameters, thereby increasing the practicality of the overall device.

[0021] Preferably, each of the guide rods is provided with a buffer component for buffering the auxiliary support plate.

[0022] By adopting the above technical solution, the energy absorption component absorbs the vibration force exerted on the auxiliary support plate, thereby reducing the damage to the adjusting part caused by the shaking of the auxiliary support plate during the turning process of the workpiece, that is, reducing the phenomenon of loosening of the threads between the adjusting screw and the adjusting screw sleeve, thereby ensuring the service life of the adjusting part.

[0023] Preferably, the buffer assembly includes a buffer ring and a buffer member, the buffer ring is slidably mounted on the guide rod, the buffer members are arranged on both sides of the buffer ring, and each of the buffer members is mounted on the guide rod; the side walls of the two buffer members facing each other are connected to the buffer ring, one group of the buffer members is connected to the positioning seat at the end away from the buffer ring, and the other group of the buffer members is connected to the auxiliary support plate at the end away from the buffer ring.

[0024] By adopting the above technical solution, when the auxiliary support plate is subjected to a force, the auxiliary support plate transmits the force to the buffer component to deform and expand, and the buffer ring moves along the length direction of the guide rod, so that the two groups of buffer components are continuously switched between the two states of tension and contraction, so as to convert the force applied to the auxiliary support plate into the potential energy of the buffer component and the kinetic energy of the buffer ring, thereby realizing energy absorption and ensuring the working life of the adjustment component.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The clamping part is provided to clamp the workpiece to be processed, and the driving assembly is used to drive the mounting seat to drive the clamping part and the workpiece to move, so as to facilitate turning and blinding of the workpiece, simplifying the processing process of continuous disassembly and assembly of the workpiece and the three-jaw chuck, thereby improving the turning efficiency of the workpiece; 2. By setting up auxiliary support components to assist in supporting the workpiece, the phenomenon of the clamping part alone clamping and supporting the workpiece and causing the workpiece to shake is reduced, thereby ensuring stable processing of the workpiece; 3. The distance between the auxiliary support plate and the positioning seat is adjusted by setting an adjusting piece, so as to assist in supporting workpieces of different diameters, thereby increasing the practicality of the overall device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a lathe with a concentric clamp according to an embodiment of the present application.

[0027] Figure 2 It is a structural schematic diagram used to reflect the positional relationship between the auxiliary support component and the clamping part.

[0028] Figure 3 It is a cross-sectional schematic diagram used to reflect the internal structure of the clamping part.

[0029] Figure 4 It is a cross-sectional schematic diagram used to reflect the internal structure of the auxiliary support component.

[0030] Description of reference numerals: 1. Machine body; 10. Workpiece; 11. Mounting seat; 111. Mounting port; 2. Clamping portion; 21. Rotating ring; 211. Spiral groove; 22. Extension portion; 23. Driving gear ring; 231. Toggle rod; 232. Card interface; 24. Mounting ring; 241. Sliding notch; 25. Clamping block; 251. Tooth pattern; 3. Driving assembly; 31. Sliding table; 32. Driving screw; 33. Driving motor; 4. Auxiliary support assembly; 41. Auxiliary support plate; 42. Ball bearing; 43. Positioning seat; 44. Adjusting member; 441. Guide rod; 442. Adjusting screw; 443. Adjusting screw sleeve; 444. Adjusting gear ring; 445. Rotating gear; 446. Rotating motor; 5. Buffer assembly; 51. Buffer ring; 52. Buffer member. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The embodiment of the present application discloses a lathe with a concentric fixture for improving turning processing efficiency.

[0033] Reference Figure 1 and Figure 2 A lathe with a concentric fixture includes a machine body 1 for machining an axial workpiece 10. In this embodiment, the machine body 1 is a horizontal lathe. A mounting seat 11 is connected to the machine body 1, and a clamping portion 2 is rotatably mounted on the mounting seat 11 to clamp and fix the workpiece 10. A driving assembly 3 is installed on the machine body 1 to drive the mounting seat 11 to move along the length direction of the machine body 1.

[0034] Reference Figure 2 and Figure 3 The clamping part 2 includes a rotating ring 21, an extension part 22, a driving gear ring 23, a mounting ring 24 and a plurality of clamping blocks 25; the mounting seat 11 is provided with a mounting opening 111 along the thickness direction for the workpiece 10 to pass through. The rotating ring 21 is rotatably connected to the inner peripheral wall of the mounting opening 111, and the extension part 22 is integrally formed on the end wall of one end of the rotating ring 21 and extends to the outside of the mounting seat 11. The driving gear ring 23 is fixedly sleeved on the extension part 22 by screws, so that the user can turn the driving gear ring 23 to drive the rotating ring 21 to rotate.

[0035] Reference Figure 2 and Figure 3 The end wall of the driving gear ring 23 away from the rotating ring 21 is provided with a plurality of groups of card interfaces 232, and all the card interfaces 232 are distributed at intervals along the circumference of the driving gear ring 23. A toggle rod 231 can be inserted into each group of card interfaces 232, so that the user can drive the driving gear ring 23 to rotate.

[0036] Reference Figure 2 and Figure 3 The mounting ring 24 is fixedly connected to the inner peripheral wall of the mounting opening 111, and the mounting ring 24 is located on the side wall of the rotating ring 21 away from the extension portion 22. In this embodiment, the mounting ring 24 and the rotating ring 21 are coaxially arranged. The side wall of the mounting ring 24 facing the rotating ring 21 is provided with a plurality of groups of sliding notches 241, and all the sliding notches 241 are distributed at intervals along the circumference of the mounting ring 24. In this embodiment, the sliding notches 241 and the clamping blocks 25 are respectively arranged one by one, and each group of clamping blocks 25 is slidably connected to the inside of the corresponding sliding notch 241, so as to clamp and fix the workpiece 10 passing through the mounting ring 24.

[0037] Reference Figure 2 and Figure 3 A spiral groove 211 is formed on the side wall of the rotating ring 21 facing the clamping block 25 around the central axis of the rotating ring 21, and a tooth pattern 251 is integrally formed on the side wall of each group of clamping blocks 25 facing the rotating ring 21, and the tooth pattern 251 is meshed with the spiral groove 211, so that all the clamping blocks 25 are driven to move closer to or away from each other through the rotation of the rotating ring 21.

[0038] Reference Figure 1 and Figure 2 The driving assembly 3 includes a sliding table 31, a driving screw 32 and a driving motor 33; the sliding table 31 is slidably mounted on the body 1 along the length direction of the body 1, and the side wall of the sliding table 31 facing away from the body 1 is fixedly connected to the mounting seat 11. The driving screw 32 is rotatably connected to the body 1, and the length direction of the driving screw 32 is parallel to the length direction of the body 1. The driving screw 32 passes through the sliding table 31, and the driving screw 32 is threadedly connected to the sliding table 31. The driving motor 33 is fixedly mounted at the end of the body 1, and the output end of the driving motor 33 is drivingly connected to the end of the driving screw 32 to drive the driving screw 32 to rotate.

[0039] Reference Figure 2 and Figure 4 , an auxiliary support assembly 4 is installed on the machine body 1 to provide auxiliary support for the workpiece 10. The auxiliary support assembly 4 includes an auxiliary support plate 41, a plurality of groups of balls 42, a positioning seat 43 and an adjusting member 44; the positioning seat 43 is installed on the machine body 1, and the auxiliary support plate 41 is located on the side of the positioning seat 43 away from the machine body 1. All the balls 42 are embedded on the side wall of the auxiliary support plate 41 away from the positioning seat 43, and each group of balls 42 can rotate relative to the auxiliary support plate 41.

[0040] Reference Figure 2 and Figure 4The adjusting member 44 is installed between the positioning seat 43 and the auxiliary support plate 41 to adjust the distance between the auxiliary support plate 41 and the positioning seat 43. The adjusting member 44 includes a plurality of guide rods 441, an adjusting screw rod 442, an adjusting screw sleeve 443, an adjusting gear ring 444, a rotating gear 445 and a rotating motor 446; all the guide rods 441 are welded and fixed to the side wall of the auxiliary support plate 41 facing the positioning seat 43, all the guide rods 441 are distributed at intervals along the circumference of the auxiliary support plate 41, and the end of each group of guide rods 441 away from the auxiliary support plate 41 can penetrate the positioning seat 43.

[0041] Reference Figure 2 and Figure 4 The adjusting screw 442 is rotatably connected to the side wall of the auxiliary support plate 41 facing the positioning seat 43 through a bearing, and the adjusting screw 442 is located on the central axis of the auxiliary support plate 41. The adjusting screw sleeve 443 is rotatably connected to the positioning seat 43 through a bearing, and the end of the adjusting screw 442 away from the auxiliary support plate 41 passes through the adjusting screw sleeve 443, and the peripheral wall of the adjusting screw 442 is threadedly connected to the inner peripheral wall of the adjusting screw sleeve 443.

[0042] Reference Figure 2 and Figure 4 The adjusting toothed ring 444 is fixedly sleeved on the adjusting screw sleeve 443, the rotating motor 446 is fixedly embedded in the positioning seat 43, the rotating gear 445 is fixedly installed on the output end of the rotating motor 446, and the rotating gear 445 and the adjusting toothed ring 444 are meshed with each other to drive the adjusting screw sleeve 443 to rotate, thereby adjusting the distance between the auxiliary support plate 41 and the positioning seat 43.

[0043] Reference Figure 2 and Figure 4 , a buffer assembly 5 is installed on each group of guide rods 441 to buffer the auxiliary support plate 41. The buffer assembly 5 includes a buffer ring 51 and a buffer member 52. In this embodiment, the buffer member 52 is a spring. The buffer members 52 are all slidably sleeved on the guide rods 441, and there are two groups of buffer members 52 on each group of guide rods 441. The buffer ring 51 is slidably sleeved on the guide rods 441, and the buffer ring 51 is located between the two groups of buffer members 52. The ends of the two groups of buffer members 52 facing each other are both glued to the side walls of the buffer ring 51, and the end of one group of buffer members 52 away from the buffer ring 51 is glued to the side wall of the positioning seat 43 facing the auxiliary support plate 41. The end of the other group of buffer members 52 away from the buffer ring 51 is glued to the end of the auxiliary support plate 41 facing the positioning seat 43.

[0044] The implementation principle of a lathe with a concentric fixture in the embodiment of the present application is: The workpiece 10 to be processed is inserted into the rotating ring 21 and the mounting ring 24, and the driving gear ring 23 is driven to drive the extension part 22 and the rotating ring 21 to rotate, so that all the clamping blocks 25 gradually approach each other and clamp the workpiece 10 to fix it, so as to determine the processing axis of the workpiece 10. The output end of the driving motor 33 drives the driving screw 32 to rotate, so as to drive the sliding table 31 to drive the mounting seat 11 and the workpiece 10 to move, so as to facilitate the end of the workpiece 10 to be headed, reducing the cumbersome processing process of disassembling the workpiece 10 for headed processing, thereby improving the processing efficiency of turning.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lathe with a concentric fixture, comprising a body (1) for machining a workpiece (10), characterized in that: The machine body (1) is provided with a mounting seat (11), a clamping portion (2) for clamping a workpiece (10) is rotatably provided on the mounting seat (11), and a driving component (3) for driving the mounting seat (11) to move along the length direction of the machine body (1) is provided on the machine body (1).

2. A lathe with a concentric fixture according to claim 1, characterized in that: The clamping portion (2) comprises a rotating ring (21), an extension portion (22), a driving gear ring (23), a mounting ring (24) and a plurality of groups of clamping blocks (25); a mounting opening (111) is provided inside the mounting seat (11) for the workpiece (10) to pass through; the rotating ring (21) is rotatably arranged inside the mounting opening (111); the extension portion (22) is arranged on the side wall of the rotating ring (21); the driving gear ring (23) is sleeved on the extension portion (22) to drive the rotating ring (21) to rotate; the mounting ring (24) is arranged inside the mounting opening (111), and the rotating ring (21) and the mounting ring (24) are coaxial. The mounting ring (24) is provided with a plurality of groups of sliding notches (241) on the side wall facing the rotating ring (21) for the clamping blocks (25) to slide, each of the clamping blocks (25) is slidably arranged inside the sliding notch (241), and all of the clamping blocks (25) are distributed at intervals along the circumference of the mounting ring (24); the rotating ring (21) is provided with a spiral groove (211) on the side wall facing the clamping block (25), and each of the clamping blocks (25) is provided with a tooth pattern (251) meshing with the spiral groove (211) on the side wall facing the rotating ring (21), so as to drive all of the clamping blocks (25) to move away from or approach each other.

3. A lathe with a concentric fixture according to claim 2, characterized in that: A toggle rod (231) is inserted into the side wall of the driving gear ring (23), and a plurality of groups of card interfaces (232) for the toggle rod (231) to be carded are provided on the driving gear ring (23), and all the card interfaces (232) are distributed at intervals along the circumference of the driving gear ring (23).

4. A lathe with a concentric fixture according to claim 1, characterized in that: The driving assembly (3) comprises a sliding table (31), a driving screw (32) and a driving motor (33); the sliding table (31) is slidably arranged on the machine body (1) along the length direction of the machine body (1), and the sliding table (31) is connected to the mounting seat (11); the driving screw (32) is rotatably arranged on the machine body (1), and the length direction of the driving screw (32) is parallel to the length direction of the machine body (1); the driving screw (32) passes through the sliding table (31), and the driving screw (32) is threadedly connected to the sliding table (31); the driving motor (33) is arranged at one end of the machine body (1) to drive the driving screw (32) to rotate.

5. A lathe with a concentric fixture according to claim 1, characterized in that: An auxiliary support component (4) is provided on the machine body (1) for auxiliary supporting the workpiece (10).

6. A lathe with a concentric fixture according to claim 5, characterized in that: The auxiliary support assembly (4) comprises an auxiliary support plate (41), a plurality of groups of ball bearings (42), a positioning seat (43) and an adjusting member (44); the auxiliary support plate (41) is arranged on the machine body (1), and the side wall of the auxiliary support plate (41) away from the machine body (1) can abut against the workpiece (10); all the ball bearings (42) are rotatably arranged on the side wall of the auxiliary support plate (41) away from the machine body (1) to support the workpiece (10); the positioning seat (43) is arranged on the machine body (1), and the positioning seat (43) is located between the auxiliary support plate (41) and the machine body (1); the adjusting member (44) is arranged between the positioning seat (43) and the auxiliary support plate (41) to adjust the distance between the auxiliary support plate (41) and the positioning seat (43).

7. A lathe with a concentric fixture according to claim 6, characterized in that: The adjusting member (44) comprises a plurality of guide rods (441), an adjusting screw rod (442), an adjusting screw sleeve (443), an adjusting toothed ring (444), a rotating gear (445) and a rotating motor (446); all the guide rods (441) are arranged on the side wall of the auxiliary support plate (41) facing the positioning seat (43); all the guide rods (441) are distributed at intervals along the circumference of the auxiliary support plate (41); and the end of each guide rod (441) away from the auxiliary support plate (41) penetrates the positioning seat (43); the adjusting screw rod (442) is rotatably arranged on the side wall of the auxiliary support plate (41) facing the positioning seat (43); The side wall is provided with an adjusting screw sleeve (443) which is rotatably arranged on the positioning seat (43); the end of the adjusting screw rod (442) which is away from the auxiliary support plate (41) passes through the adjusting screw sleeve (443), and the adjusting screw rod (442) is threadedly connected with the adjusting screw sleeve (443); the adjusting toothed ring (444) is sleeved on the adjusting screw sleeve (443), the rotating gear (445) is rotatably arranged on the positioning seat (43), and the rotating gear (445) and the adjusting toothed ring (444) are meshed with each other; the rotating motor (446) is arranged on the positioning seat (43) to drive the rotating gear (445) to rotate.

8. A lathe with a concentric fixture according to claim 7, characterized in that: Each of the guide rods (441) is provided with a buffer assembly (5) for buffering the auxiliary support plate (41).

9. A lathe with a concentric fixture according to claim 8, characterized in that: The buffer assembly (5) comprises a buffer ring (51) and a buffer component (52); the buffer ring (51) is slidably mounted on the guide rod (441); the buffer component (52) is arranged on both sides of the buffer ring (51); each of the buffer components (52) is mounted on the guide rod (441); the side walls of the two buffer components (52) facing each other are connected to the buffer ring (51); the end of one group of the buffer components (52) away from the buffer ring (51) is connected to the positioning seat (43); the end of the other buffer component (52) away from the buffer ring (51) is connected to the auxiliary support plate (41).

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