Multi-station clamp for machining brake calipers

Abstract

The utility model discloses a multi-station clamp for processing brake calipers, which comprises a working table, a four-axis turntable and a tailstock are arranged on the working table, a driving shaft is arranged on the four-axis turntable in a driving way, a fixed frame is fixedly arranged on the driving shaft, a connecting shaft is arranged at the other end of the fixed frame, and the connecting shaft is connected with the tail seat. The connecting shaft and the driving shaft are coaxially arranged, the connecting shaft is rotationally installed in the tailstock, a clamping device used for clamping brake calipers is installed on the fixing frame, and the clamping device comprises a first clamping mechanism, a second clamping mechanism and a third clamping mechanism. The fixture has the advantages that the fixing frame is driven to rotate through the four-axis rotary table, so that a connecting cylinder and the front end face of a lug plate of the brake caliper can be machined, the bottom face of an installation groove in the brake caliper can also be machined, the fixture does not need to be replaced, more convenience is achieved, and machining is more efficient.

Description

Technical Field

[0001] This utility model belongs to the field of tooling and fixture technology, and specifically relates to a multi-station fixture for processing brake calipers. Background Technology

[0002] Brake calipers are clamp-like devices that slow down, stop, or keep a moving wheel stationary. They are generally used in disc brake systems. Brake calipers are attached to the front and rear of the brake disc. There are one or more pistons in a car brake caliper. When braking, high-pressure brake fluid pushes the pistons in the brake caliper, pressing the brake pads against the brake disc to produce a braking effect.

[0003] During the production of brake calipers, the position of the brake calipers needs to be fixed by a fixture to facilitate the processing of the brake caliper surface. However, most fixing fixtures use two clamps to clamp the surface of the brake caliper, which may affect the processing of the brake caliper surface.

[0004] A search revealed a Chinese utility model patent (authorization announcement number: CN217668054U) that provides a fixture for machining automotive brake caliper blanks, comprising: a base plate, a clamping assembly, a first connecting plate, and a second connecting plate; the clamping assembly is disposed on the base plate and clamps the workpiece to be machined, and there are four clamping assemblies, two of which are disposed on the top surface of the base plate and two of which are disposed on the bottom surface of the base plate; both ends of the base plate are connected to the cantilever of a horizontal axis turntable via the first connecting plate and the second connecting plate, respectively;

[0005] The aforementioned prior art, by setting a first connecting plate and a second connecting plate at both ends of the base plate and mounting them to the horizontal axis rotary table, enables the base plate to be flipped, facilitating simultaneous machining by the dual spindles of a horizontal machining center and simplifying clamping. By setting four clamping components on the base plate to clamp the workpieces, four workpieces can be clamped at a time, improving machining efficiency.

[0006] refer to Figure 1 - Figure 2 A prior art brake caliper 1 includes a connecting cylinder 11, a fixing plate 12, and a connecting plate 13. The connecting cylinder 11 and the fixing plate 12 are connected by the connecting plate 13. A mounting groove 10 for placing a brake disc is formed between the connecting cylinder 11, the fixing plate 12, and the connecting plate 13. Two symmetrical ear plates 14 are provided on the outer wall of the connecting cylinder 11, and a through positioning hole 15 is provided at the bottom of the mounting groove 10. In addition, a positioning groove 17 is provided at the bottom of the connecting cylinder 11, and two positioning slots 16 are provided at the bottom of the connecting plate 13. The aforementioned brake caliper 1 requires machining of the front end faces of the connecting cylinder 11 and the ear plates 14, and also requires machining of the bottom surface of the mounting groove 10. Therefore, both sides of the brake caliper 1 need to be machined.

[0007] The existing technology for processing the aforementioned brake calipers has the following drawback: it can only process one end face of the brake caliper. If it is necessary to process the other end faces of the caliper, other clamps are required, which makes the processing steps more complicated. Therefore, it is urgent to improve this shortcoming. Utility Model Content

[0008] The purpose of this invention is to address the above-mentioned problems. This invention provides a multi-station fixture for machining brake calipers, which has the advantage of machining both sides of the caliper with one set of fixtures.

[0009] To achieve the above objectives, this utility model provides the following technical solution: It includes a worktable, on which a four-axis rotary table and a tailstock are mounted. A drive shaft is driven onto the four-axis rotary table, and a fixed frame is fixedly mounted on the drive shaft. A connecting shaft is mounted at the other end of the fixed frame. The connecting shaft is coaxially arranged with the drive shaft and rotatably mounted within the tailstock. A clamping device for holding a brake caliper is mounted on the fixed frame. The clamping device includes a first clamping mechanism, a second clamping mechanism, and a third clamping mechanism. A first support member and a second support member are mounted on the fixed frame. The first support member supports the bottom of the ear plate, and the second support member supports the bottom of the fixed plate. The first clamping mechanism cooperates with the first support member to clamp the ear plate. The second clamping mechanism, the third clamping mechanism, and the second support member cooperate to clamp the connecting plate.

[0010] Preferably, a fixed base is installed at the bottom of the fixed frame, and the first clamping mechanism includes a first hydraulic cylinder installed on the fixed base. The first hydraulic cylinder drives a first push rod, and a connecting shaft is provided on the first push rod. A T-shaped block is provided on the outside of the connecting shaft. The T-shaped block has an oblong hole for the connecting shaft to slide. A connecting frame is provided on the fixed frame. The middle part of the T-shaped block is hinged to the connecting frame. A clamping claw is fixedly installed on the T-shaped block. The clamping claw includes a connecting block and two claw blocks. The claw blocks are symmetrically arranged at both ends of the connecting block. The claw blocks respectively cooperate with the corresponding ear plates. The claw blocks have abutment grooves, and the abutment grooves abut against the upper surface of the ear plates.

[0011] Preferably, the upper end face of the fixing frame is provided with a connecting seat, and the second clamping mechanism and the third clamping mechanism are both disposed on the connecting seat. The second clamping mechanism includes a first rotating cylinder, a first pawl is installed on the first rotating cylinder, and a first abutting block is provided on the first pawl. The first abutting block is used to abut and cooperate with the upper end of the connecting plate.

[0012] Preferably, the third clamping mechanism includes a second rotary cylinder, on which a second pawl is mounted, and on which a second abutment block is provided, the second abutment block being used to abut against the upper end of the connecting plate.

[0013] Preferably, the first support includes two second hydraulic cylinders, each of which is provided with an abutment shaft. The abutment shaft abuts against the bottom of the brake caliper, and the two abutment shafts are arranged in a one-to-one correspondence with the position of the claw block.

[0014] Preferably, the second support includes two fixing blocks, each of which is provided with a pin. The two pins are respectively inserted into two positioning slots on the brake caliper to achieve the function of positioning and fixing the brake caliper.

[0015] Preferably, a first positioning component is installed on the fixing frame. The first positioning component includes a connecting platform, and a positioning block that mates with the positioning hole is provided on the connecting platform. The positioning block is inserted into and positioned in the positioning hole.

[0016] Preferably, the fixing frame is further provided with a second positioning component, the second positioning component including a mounting block and a positioning post that cooperates with the positioning groove at the upper end of the mounting block.

[0017] Preferably, a third positioning component is installed on the fixing frame. The third positioning component includes a first mounting base and a second mounting base. The first mounting base and the second mounting base are symmetrically installed on both sides of the positioning block. A first top shaft is installed in the first mounting base, and a third hydraulic cylinder is installed in the second mounting base. A second top shaft is driven to be installed on the third hydraulic cylinder. The first top shaft is abutted against the side wall of the connecting plate, and the second top shaft is used to abut against the side wall of the other end of the connecting plate.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This utility model provides a multi-station fixture for machining brake calipers. Positioning and installation are achieved through the insertion and engagement of the insert shaft and the positioning slot, the engagement between the positioning block and the positioning hole, and the engagement between the positioning pin and the positioning groove, thereby enabling the brake caliper to move in the X and Y axes. The engagement between the claw block and the abutment shaft further restricts the movement of the connecting cylinder in the Z axis. The engagement between the first and second abutment blocks and the insert shaft further restricts the movement of the connecting plate in the Z axis. Finally, the engagement between the first and second top shafts and the brake caliper restricts the movement of the brake caliper in the X axis. Through multi-point positioning and abutment engagement, the brake caliper is fixed in place.

[0020] Furthermore, the four-axis rotary table drives the fixed frame to rotate, which enables the machining of the connecting cylinder and the front face of the lug of the brake caliper, as well as the machining of the bottom face of the mounting groove on the brake caliper. This eliminates the need to change fixtures, making the machining more convenient and efficient. Attached Figure Description

[0021] Figure 1 A first-view three-dimensional structural diagram of an existing brake caliper.

[0022] Figure 2 A second-view three-dimensional structural diagram of an existing brake caliper.

[0023] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 4 This is a schematic diagram of the main structure of this utility model;

[0025] Figure 5 This is a top view of the structure of this utility model;

[0026] Figure 6 This is a three-dimensional structural diagram of the first clamping mechanism of this utility model;

[0027] Figure 7 This is a three-dimensional schematic diagram of the first support component of this utility model;

[0028] Figure 8 This is a three-dimensional structural diagram of the third positioning component of this utility model;

[0029] Figure 9 This is a three-dimensional structural diagram of the first positioning component, the second positioning component, and the second support member of this utility model.

[0030] Figure Descriptions: 1. Brake caliper; 10. Mounting slot; 11. Connecting cylinder; 12. Fixing plate; 13. Connecting plate; 14. Ear plate; 15. Positioning hole; 16. Positioning slot; 17. Positioning groove; 2. Worktable; 21. Four-axis rotary table; 22. Tailstock; 23. Fixing frame; 24. Fixing seat; 3. First clamping mechanism; 31. First hydraulic cylinder; 32. First push rod; 321. Connecting shaft; 33. T-block; 331. Waist-shaped hole; 34. Connecting frame; 35. Clamping claw; 351. Claw block; 352. Abutment groove; 4. Second clamping mechanism; 40. Connecting seat; 41. 42. First gripper; 43. First abutment block; 5. Third clamping mechanism; 51. Second rotary cylinder; 52. Second gripper; 53. Second abutment block; 6. Third positioning assembly; 61. First mounting base; 62. Second mounting base; 63. First top shaft; 64. Third hydraulic cylinder; 65. Second top shaft; 7. First support member; 71. Second hydraulic cylinder; 72. Abutment shaft; 801. Second support member; 81. Fixing block; 82. Insert shaft; 802. Second positioning assembly; 83. Mounting block; 84. Positioning post; 9. First positioning assembly; 91. Connecting platform; 92. Positioning block. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] like Figure 3 - Figure 9As shown, a multi-station fixture for machining brake calipers includes a worktable 2, on which a four-axis rotary table 21 and a tailstock 22 are mounted. The four-axis rotary table 21 is existing technology and will not be described in detail here. A drive shaft is driven onto the four-axis rotary table 21, and a fixing frame 23 is fixedly mounted on the drive shaft. A connecting shaft 321 is mounted at the other end of the fixing frame 23. The connecting shaft 321 is coaxially arranged with the drive shaft and rotatably mounted within the tailstock 22. A clamping device for holding brake calipers 1 is mounted on the fixing frame 23. The clamping device includes a first clamping mechanism 3, a second clamping mechanism 4, and a third clamping mechanism 5. A first support member 7 and a second support member 8 are mounted on the fixing frame 23. 01, the first support member 7 is used to support the bottom of the ear plate 14, the second support member 801 is used to support the bottom of the fixing plate 12, the first clamping mechanism 3 is used to abut against the upper end of the ear plate 14, the first clamping mechanism 3 cooperates with the first support member 7 to clamp the ear plate 14 of the brake caliper 1, the second clamping mechanism 4 and the third clamping mechanism 5 are used to abut against the upper end of the connecting plate 13, the second clamping mechanism 4, the third clamping mechanism 5 and the second support member 801 cooperate to clamp the connecting plate 13 of the brake caliper 1, and the movement of the brake caliper 1 on the Z-axis is restricted by the cooperation of the first clamping mechanism 3, the second clamping mechanism 4, the third clamping mechanism 5, the first support member 7 and the second support member 801.

[0033] The fixing frame 23 has a fixing base 24 installed at its bottom. The first clamping mechanism 3 includes a first hydraulic cylinder 31 installed on the fixing base 24. The first hydraulic cylinder 31 drives a first push rod 32. The first push rod 32 is provided with a connecting shaft 321. A T-shaped block 33 is provided on the outside of the connecting shaft 321. The T-shaped block 33 is provided with an oblong hole 331 for the connecting shaft 321 to slide. The fixing frame 23 is provided with a connecting frame 34. The middle part of the T-shaped block 33 is hinged to the connecting frame 34. A clamping claw 35 is fixedly installed on the block 33. The clamping claw 35 includes a connecting block and two claw blocks 351. The claw blocks 351 are symmetrically arranged at both ends of the connecting block. The claw blocks 351 respectively cooperate with the corresponding ear plates 14, and a processing space is formed between the two claw blocks 351 for processing the front end face of the connecting cylinder 11. The claw blocks 351 have an abutment groove 352, which abuts against the upper end face of the ear plate 14. It should be noted that the connecting block and the claw blocks 351 are integrally formed.

[0034] Specifically, the first hydraulic cylinder 31 drives the clamping claw 35 to swing back and forth in a first position and a second position. When the clamping claw 35 is in the first position, the abutting groove 352 abuts against the upper end surface of the ear plate 14; when the clamping claw 35 is in the second position, the abutting groove 352 disengages from the upper end surface of the ear plate 14.

[0035] The upper surface of the fixing frame 23 is provided with a connecting seat 40, and the second clamping mechanism 4 and the third clamping mechanism 5 are both disposed on the connecting seat 40.

[0036] The second clamping mechanism 4 includes a first rotary cylinder 41, on which a first pawl 42 is mounted. The first pawl 42 has a protruding first abutment block 43, which is used to abut against the upper end of the connecting plate 13. The first rotary cylinder 41 drives the first pawl 42 to swing back and forth between a third position and a fourth position. When the first pawl 42 is in the third position, the first pawl 42 abuts against the connecting plate 13. When the first pawl 42 is in the fourth position, the first pawl 42 disengages from the connecting plate 13.

[0037] The third clamping mechanism 5 includes a second rotary cylinder 51, on which a second pawl 52 is mounted. The second pawl 52 has a protruding second abutment block 53, which is used to abut against the upper end of the connecting plate 13. The second rotary cylinder 51 drives the second pawl 52 to swing back and forth between the fifth and sixth positions. When the second pawl 52 is in the fifth position, the second pawl 52 abuts against the connecting plate 13. When the second pawl 52 is in the sixth position, the second pawl 52 disengages from the connecting plate 13.

[0038] It should be noted that the first rotating cylinder 41 and the second rotating cylinder 51 will move axially while rotating, thus ensuring that the first abutting block 43 and the second abutting block 53 can abut against the fixing plate 12 of the brake caliper 1 after rotation.

[0039] The first support member 7 includes two second hydraulic cylinders 71, each of which is provided with an abutment shaft 72. The abutment shaft 72 abuts against the bottom of the brake caliper 1, and the two abutment shafts 72 are arranged in a one-to-one correspondence with the position of the claw block 351.

[0040] The second support member 801 includes two fixing blocks 81, each of which is provided with a shaft 82. The two shafts 82 are respectively inserted into the two positioning slots 16 on the brake caliper 1.

[0041] The fixing frame 23 is equipped with a first positioning component 9, which includes a connecting platform 91. The connecting platform 91 is provided with a positioning block 92 that cooperates with the positioning hole 15. The positioning block 92 is inserted into and positioned in the positioning hole 15.

[0042] The fixing frame 23 is also provided with a second positioning component 802. The second positioning component 802 includes a mounting block 83 and a positioning post 84 that cooperates with the positioning groove 17 at the upper end of the mounting block 83. When the brake caliper 1 is clamped, the positioning post 84 is inserted into the positioning groove 17.

[0043] The movement of the brake caliper 1 in the X and Y axes is restricted by the insertion and engagement of the insert shaft 82 with the positioning slot 16, the engagement between the positioning block 92 and the positioning hole 15, and the engagement between the positioning post 84 and the positioning groove 17.

[0044] A third positioning component 6 is installed on the fixing frame 23. The third positioning component 6 includes a first mounting base 61 and a second mounting base 62. The first mounting base 61 and the second mounting base 62 are symmetrically installed on both sides of the positioning block 92. The first mounting base 61 and the second mounting base 62 are arranged along the X-axis. A first top shaft 63 is installed in the first mounting base 61, and a third hydraulic cylinder 64 is installed in the second mounting base 62. A second top shaft 65 is driven to be installed on the third hydraulic cylinder 64. The first top shaft 63 abuts against the side wall of the connecting plate 13, and the second top shaft 65 is used to abut against the other side wall of the connecting plate 13. When the first top shaft 63 and the second top shaft 65 abut against the connecting plate 13, the movement of the brake caliper 1 in the X-axis direction is restricted.

[0045] When installing the brake caliper 1: First, align the positioning hole 15 of the brake caliper 1 with the positioning block 92 on the mounting bracket 23. Then, through the insertion and engagement of the insert shaft 82 with the positioning slot 16, the engagement between the positioning block 92 and the positioning hole 15, and the engagement between the positioning pin 84 and the positioning groove 17, the brake caliper 1 is positioned. Next, by activating the first hydraulic cylinder 31, the first hydraulic cylinder 31 drives the first push rod 32 to move, thereby causing the T-shaped block 33 to swing, which in turn causes the clamping claw 35 to swing from the second position to the first position. This causes the abutment groove 352 on the claw block 351 to abut against the corresponding ear plate 14. Then, by activating the first rotary cylinder 41 and the second rotary cylinder 51, the first pawl 42 moves from the fourth position to the third position, and the second pawl 52 moves from the sixth position to the fifth position, thereby causing the first abutment block 43 on the first pawl 42 and the second abutment block 53 on the second pawl 52 to abut against the upper end of the connecting plate 13. The system first engages the brake caliper 1 by activating the second cylinder 71, which in turn engages the abutment shaft 72 with the bottom of the brake caliper 1. Then, by activating the third cylinder 64, the second top shaft 65 engages with the brake caliper 1. This engagement is achieved through the insertion of the insert shaft 82 into the positioning slot 16, the engagement between the positioning block 92 and the positioning hole 15, and the engagement between the positioning pin 84 and the positioning groove 17. This allows the brake caliper 1 to move in the X and Y axes. The engagement between the claw block 351 and the abutment shaft 72 restricts the movement of the connecting cylinder 11 in the Z axis. The engagement between the first abutment block 43 and the second abutment block 53 and the insert shaft 82 restricts the movement of the connecting plate 13 in the Z axis. The engagement between the first top shaft 63 and the second top shaft 65 and the brake caliper 1 restricts the movement of the brake caliper 1 in the X axis. Through multi-point positioning and engagement, the brake caliper 1 is fixed.

[0046] Furthermore, the four-axis rotary table 21 drives the fixed frame 23 to rotate, thereby enabling the machining of the connecting cylinder 11 and the front end face of the ear plate 14 of the brake caliper 1, as well as the machining of the bottom surface of the mounting groove 10 on the brake caliper 1. This eliminates the need to change fixtures, making the process more convenient and efficient.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-station fixture for processing brake calipers, comprising a worktable (2), on which a four-axis rotary table (21) and a tailstock (22) are mounted, a drive shaft is driven on the four-axis rotary table (21), a fixing frame (23) is fixedly mounted on the drive shaft, and a connecting shaft (321) is mounted at the other end of the fixing frame (23), the connecting shaft (321) being coaxially arranged with the drive shaft, and the connecting shaft (321) being rotatably mounted within the tailstock (22), characterized in that: The fixing frame (23) is equipped with a clamping device for clamping the brake caliper (1). The clamping device includes a first clamping mechanism (3), a second clamping mechanism (4) and a third clamping mechanism (5). The fixing frame (23) is equipped with a first support member (7) and a second support member (801). The first support member (7) is used to support the bottom of the ear plate (14), and the second support member (801) is used to support the bottom of the fixing plate (12). The first clamping mechanism (3) cooperates with the first support member (7) to clamp the ear plate (14). The second clamping mechanism (4), the third clamping mechanism (5) and the second support member (801) cooperate to clamp the connecting plate (13).

2. The multi-station fixture for machining brake calipers according to claim 1, characterized in that: The fixed frame (23) has a fixed base (24) installed at its bottom. The first clamping mechanism (3) includes a first hydraulic cylinder (31) installed on the fixed base (24). The first hydraulic cylinder (31) drives a first push rod (32) to be installed. A connecting shaft (321) is provided on the first push rod (32). A T-shaped block (33) is provided on the outside of the connecting shaft (321). An oblong hole (331) is provided on the T-shaped block (33) for the connecting shaft (321) to slide. A connecting frame is provided on the fixed frame (23). (34) The middle part of the T-shaped block (33) is hinged to the connecting frame (34). A clamping claw (35) is fixedly installed on the T-shaped block (33). The clamping claw (35) includes a connecting block and two claw blocks (351). The claw blocks (351) are symmetrically arranged at both ends of the connecting block. The claw blocks (351) respectively cooperate with the corresponding ear plates (14). The claw blocks (351) have abutting grooves (352). The abutting grooves (352) abut against the upper surface of the ear plates (14).

3. A multi-station fixture for machining brake calipers according to claim 2, characterized in that: The upper end face of the fixed frame (23) is provided with a connecting seat (40). The second clamping mechanism (4) and the third clamping mechanism (5) are both provided on the connecting seat (40). The second clamping mechanism (4) includes a first rotating cylinder (41). A first claw (42) is installed on the first rotating cylinder (41). A first abutting block (43) is provided on the first claw (42). The first abutting block (43) is used to abut against the upper end of the connecting plate (13).

4. A multi-station fixture for machining brake calipers according to claim 3, characterized in that: The third clamping mechanism (5) includes a second rotary cylinder (51), on which a second claw (52) is installed. The second claw (52) is provided with a protruding second abutment block (53), which is used to abut against the upper end of the connecting plate (13).

5. A multi-station fixture for machining brake calipers according to claim 4, characterized in that: The first support member (7) includes two second cylinders (71), each of which is provided with an abutment shaft (72). The abutment shaft (72) abuts against the bottom of the brake caliper (1), and the two abutment shafts (72) are positioned in a one-to-one correspondence with the claw block (351).

6. A multi-station fixture for machining brake calipers according to claim 1, characterized in that: The second support member (801) includes two fixing blocks (81), each of which is provided with a pin (82). The two pins (82) are respectively inserted into the two positioning slots (16) on the brake caliper (1).

7. A multi-station fixture for machining brake calipers according to claim 6, characterized in that: The fixing frame (23) is equipped with a first positioning component (9), which includes a connecting platform (91). The connecting platform (91) is provided with a positioning block (92) that cooperates with the positioning hole (15). The positioning block (92) is inserted into the positioning hole (15) for positioning cooperation.

8. A multi-station fixture for machining brake calipers according to claim 7, characterized in that: The fixing frame (23) is also provided with a second positioning component (802), which includes a mounting block (83) and a positioning post (84) that cooperates with the positioning groove (17) at the upper end of the mounting block (83).

9. A multi-station fixture for machining brake calipers according to claim 8, characterized in that: A third positioning component (6) is installed on the fixing frame (23). The third positioning component (6) includes a first mounting seat (61) and a second mounting seat (62). The first mounting seat (61) and the second mounting seat (62) are symmetrically installed on both sides of the positioning block (92). A first top shaft (63) is installed in the first mounting seat (61), and a third oil cylinder (64) is installed in the second mounting seat (62). A second top shaft (65) is driven and installed on the third oil cylinder (64). The first top shaft (63) abuts against the side wall of the connecting plate (13), and the second top shaft (65) is used to abut against the side wall of the other end of the connecting plate (13).

Images