Assembling jig of brake disc and assembling machine using assembling jig

Abstract

The utility model relates to an assembling jig of a brake disc, which is used for combining a plurality of bolts and a plurality of nuts to form the brake disc, and each bolt is provided with a head part and a first rotation stopping part positioned at the head part; the assembling jig comprises a mounting seat, a plurality of rotating preventing holes, a plurality of clamping blocks and a plurality of clamping blocks, wherein the mounting seat is provided with a bottom surface, a top surface opposite to the bottom surface, a concave accommodating part formed by concavely arranging the top surface, and a plurality of rotating preventing holes which are communicated with the concave accommodating part and correspond to first rotating preventing parts of bolts of the brake disc; and each rotation stopping piece is provided with an anti-rotation column arranged in the anti-rotation hole of the mounting seat and a second rotation stopping part which is connected with the anti-rotation column and is matched with the first rotation stopping part of each bolt of the brake disc to stop rotation. The bolt can be prevented from rotating through the second rotation stopping part of the rotation stopping piece, the nut can be arranged on the bolt in a screwed mode, and the known problem that assembling is inconvenient is solved. The utility model further comprises an assembling machine using the assembling jig of the brake disc.

Description

Technical Field

[0001] This utility model relates to brake disc assembly, and in particular to a brake disc assembly fixture and an assembly machine using the assembly fixture. Background Technology

[0002] The known brake disc assembly fixture lacks an anti-rotation mechanism for its bolts. When the nut is tightened onto the bolt, another tool is required to prevent the bolt from rotating, making assembly quite inconvenient. Furthermore, the known brake disc assembly fixture lacks a hand grip for holding the fixture and a hand grip for removing and placing the brake disc. Additionally, the known brake disc assembly machine uses only the aforementioned assembly fixture, and the fixture cannot be quickly and securely fixed to the machine. Therefore, the aforementioned deficiencies in the known brake disc assembly fixture and brake disc assembly machine require improvement. Summary of the Invention

[0003] To address the aforementioned problems, the main objective of this utility model is to provide an assembly fixture for a brake disc and an assembly machine using the assembly fixture, which can prevent the bolts of the brake disc from rotating and facilitate the screwing of the nut onto the bolt.

[0004] To achieve the above objectives, this utility model provides a brake disc assembly fixture suitable for securing a hub housing and a disc together using multiple bolts and nuts. Each bolt has a head and a first anti-rotation portion located at the head. The assembly fixture comprises: a mounting base having a bottom surface, a top surface opposite the bottom surface, a recessed portion formed by the top surface for accommodating the hub housing and the disc, multiple anti-rotation holes communicating with the recessed portion and corresponding to the first anti-rotation portions of each bolt of the brake disc, and multiple anti-rotation members respectively disposed in the anti-rotation holes of the mounting base, each anti-rotation member having a second anti-rotation portion for engaging with the first anti-rotation portion of each bolt to prevent rotation.

[0005] By engaging the second anti-rotation part of the anti-rotation member with the first anti-rotation part of the bolt, the bolt can be prevented from rotating, which facilitates the screwing of the nut onto the bolt.

[0006] In the above-described technical solution of this utility model, the mounting base also has multiple screw holes that correspond to and communicate with each of the anti-rotation holes, each anti-rotation member has a lower screw hole, and the assembly fixture further includes multiple connecting bolts, which are respectively screwed into each of the screw holes of the mounting base and the lower screw holes of each of the anti-rotation members. By screwing the connecting bolts into the lower screw holes of the anti-rotation members, the anti-rotation members can be fixed to prevent axial displacement.

[0007] An escape hole is formed at the opening of each of the anti-rotation holes of the mounting base, and each escape hole is used to accommodate the head of the bolt. Through each escape hole, interference between the head of the bolt and the mounting base can be avoided.

[0008] The mounting base has two opposing limiting grooves, which allow for the insertion of a two-groove limiting member of an assembly machine. This provides for limiting the vertical displacement of the mounting base, and the mounting base can slide axially along the limiting grooves via the limiting grooves.

[0009] The mounting base has two upper grooves located on opposite sides and extending to the top surface, and the upper grooves communicate with the limiting groove. The two upper grooves allow for easy insertion and removal of the brake disc by hand.

[0010] The mounting base has two upper grooves located on opposite sides and extending to the top surface. These upper grooves allow for hand access to facilitate handling of the assembly fixture.

[0011] The mounting base has two recesses located on opposite sides and communicating with the bottom surface. These recesses allow for hand access to facilitate the handling of the assembly fixture.

[0012] The mounting base has two opposing limiting edges, which respectively cooperate with the limiting members on both sides of an assembly machine. This allows the assembly fixture to be installed quickly and accurately.

[0013] The mounting base has two opposing limiting edges, which are pressed against by two vertically movable pressure plates of an assembly machine. This allows the assembly fixture to be more securely fixed.

[0014] The mounting base has multiple positioning holes for inserting multiple positioning pins of an assembly machine. This allows for precise positioning of the assembly fixture.

[0015] On the other hand, this utility model also provides a brake disc assembly machine, which can securely fix the assembly fixture to facilitate locking the brake disc hub housing and disc.

[0016] To achieve the above objectives, the present invention provides a brake disc assembly machine comprising: an assembly fixture, characterized in that the assembly fixture comprises: a mounting base having a bottom surface, a top surface opposite the bottom surface, and a recessed portion formed by the top surface for accommodating a hub housing and a disc; a plurality of anti-rotation members fixed to the mounting base for fixing and preventing rotation of a plurality of bolts used to lock the hub housing and the disc; a bearing device for supporting the assembly fixture; a fixing device for fixing the assembly fixture; a nut providing device for providing a plurality of nuts for locking onto each of the bolts; a displacement device capable of displacement relative to the bearing device; and a screw-on device disposed on the displacement device for picking up each of the nuts and locking each of the nuts onto each of the bolts.

[0017] The assembly fixture is fixed by the fixing device, which can be firmly fixed to the assembly machine, and facilitates the nut to be locked onto the bolt to lock the brake disc hub housing and disc together.

[0018] The supporting device includes multiple rolling elements, and the assembly fixture moves on the rolling elements. Thus, the rolling elements allow the assembly fixture to be moved more easily and quickly.

[0019] It also includes two slot limiting members located on opposite sides, and the assembly fixture includes two limiting grooves that respectively accommodate the two slot limiting members. Thus, the slot limiting members can prevent the assembly fixture from moving upward and can guide the assembly fixture to slide axially along the limiting grooves.

[0020] It also includes two side limiting members located on opposite sides, and the assembly fixture includes two limiting edges located next to the two side limiting members. Therefore, the side limiting members can improve the accuracy of the assembly fixture's movement.

[0021] It also includes a position sensor for detecting the position of the assembly fixture and controlling the fixing device to fix the assembly fixture. This enables rapid positioning and accurate fixing.

[0022] The fixing device includes a pressure plate that can move up and down, and the assembly fixture includes two limiting edges that are pressed against by the pressure plate of the fixing device. This allows the assembly fixture to be more securely fixed.

[0023] The fixing device includes multiple positioning posts, and the assembly fixture includes multiple positioning holes that respectively mate with the positioning posts of the fixing device. This allows for precise positioning of the assembly fixture.

[0024] The support device includes two opposing guide members, and the assembly fixture includes two opposing limiting edges that are respectively guided by the guide members of the support device. This allows the assembly fixture to be installed quickly and accurately.

[0025] It also includes a retractable exit device. The assembly fixture includes a stop edge, and the exit device is used to abut against the stop edge of the assembly fixture to displace and exit the assembly fixture. This saves more time and effort.

[0026] It also includes a rear limiting member, and the assembly fixture includes a stop edge. The rear limiting member is used to stop the stop edge of the assembly fixture, thereby stopping the assembly fixture from advancing. This allows the assembly fixture to be positioned in the desired fixing position.

[0027] The mounting base has multiple anti-rotation holes communicating with the recessed portion, and each of the anti-rotation members is respectively disposed in the anti-rotation hole of the mounting base, and the anti-rotation member is used to abut against the bolt.

[0028] The detailed structure, features, assembly, or usage of the brake disc assembly fixture and the assembly machine using the assembly fixture provided by this invention will be described in the subsequent detailed description of the embodiments. However, those skilled in the art should understand that these detailed descriptions and the specific embodiments listed for implementing this invention are for illustrative purposes only and are not intended to limit the scope of patent protection of this invention. Attached Figure Description

[0029] Figure 1 This is a perspective view of the assembly fixture and brake disc assembly provided in a preferred embodiment of the present invention;

[0030] Figure 2 yes Figure 1 A sectional view;

[0031] Figure 3 This is a partial perspective exploded view of the assembly fixture and brake disc mounting provided in the preferred embodiment of this utility model;

[0032] Figure 4 This is another exploded perspective view of the assembly fixture and brake disc mounting provided in the preferred embodiment of this utility model;

[0033] Figure 5 yes Figure 4 A sectional view;

[0034] Figure 6 This is an exploded perspective view of the assembly fixture provided in the preferred embodiment of this utility model;

[0035] Figure 7This is an exploded perspective view of the assembly fixture provided in the preferred embodiment of this utility model from another direction;

[0036] Figure 8 This is a cross-sectional view of the mounting base of the assembly fixture provided in the preferred embodiment of this utility model;

[0037] Figure 9 This is a perspective view of the assembly machine provided in a preferred embodiment of the present invention;

[0038] Figure 10 This is another perspective view of the assembly machine provided in the preferred embodiment of this utility model;

[0039] Figure 11 This is a partial perspective enlarged view of the assembly machine provided in the preferred embodiment of this utility model;

[0040] Figure 12 This is another partial perspective enlarged view of the assembly machine provided in the preferred embodiment of this utility model;

[0041] Figure 13 This is a partial perspective enlarged sectional view of the assembly machine provided in the preferred embodiment of this utility model. Detailed Implementation

[0042] The applicant hereby states that in the embodiments and drawings described below, the same reference numerals denote the same or similar elements or their structural features.

[0043] Please see Figures 1 to 5 This utility model provides a preferred embodiment of a brake disc assembly fixture 2 for convenient assembly of the brake disc 1. The brake disc 1 includes a hub housing 1a, a disc 1b, and a plurality of bolts B and nuts N for fastening the hub housing 1a and the disc 1b together. Wherein, as... Figure 5 As shown, bolt B has a head B1 and a first anti-rotation portion B2 located on the head B1. In this embodiment, the first anti-rotation portion B2 is an internal hexagonal hole. Figure 3 As shown, the brake disc 1 is placed on the assembly fixture 2, which allows the nut N to be assembled onto the bolt B, or the nut N to be removed from the bolt B.

[0044] like Figures 6 to 8 As shown, the assembly fixture 2 includes a base 10, multiple anti-rotation elements 21, multiple connecting bolts 22, and multiple bushings 25. The anti-rotation elements 21, connecting bolts 22, and bushings 25 are mounted on the base 10.

[0045] The mounting bracket 10 has a bottom surface 11, a top surface 12, a recessed portion 131, a central hole 132, an upper groove 14, multiple anti-rotation holes 151, multiple escape holes 152, multiple screw holes 153, multiple countersunk holes 154, two limiting grooves 161, two limiting edges 162, multiple bushing holes 17, two retaining edges 18, and two lower grooves 19. The bottom surface 11 and the top surface 12 are located at the bottom and top, respectively. The recessed portion 131 is recessed downward from the top surface 12 to accommodate the disc 1b of the brake disc 1. The central hole 132 extends downward from the recessed portion 131 through the bottom surface 11 and can accommodate a part of the wheel hub housing 1a of the brake disc 1. The upper groove 14 is located on the left and right sides of the top surface 12 and communicates with the recessed portion 131. The anti-rotation holes 151 are arranged circumferentially and formed downward from the recessed portion 131, corresponding to the position of the bolt B of the brake disc 1. The cross-section of the anti-rotation holes 151 is approximately square. The escape hole 152 is formed downwards and opens above the anti-rotation hole 151. The screw hole 153 is axially connected to the anti-rotation hole 151. The sinker hole 154 is axially connected to the screw hole 153 from the bottom surface 11. The limiting groove 161 is located on the left and right sides and communicates with the upper groove 14. The limiting edge 162 is located between the limiting groove 161 and the bottom surface 11. The bushing hole 17 passes through each limiting edge 162 in pairs. The stop edge 18 is located on the front and rear sides. The lower groove 19 is located on the front and rear sides of the bottom surface 11 and opens to the stop edge 18.

[0046] Among them, the escape hole 152 can accommodate the head B1 of the bolt B, the upper groove 14 can be inserted by hand to facilitate the removal and placement of the brake disc 1, and the lower groove 19 can be inserted by hand to facilitate the handling and assembly of the jig 2.

[0047] like Figure 6 and Figure 7 As shown, the anti-rotation component 21 has an anti-rotation post 211, a second anti-rotation part 212, and a lower screw hole 213. The anti-rotation post 211 has a roughly square cross-section and is installed in the anti-rotation hole 151 of the mounting base 10. The second anti-rotation part 212 is connected above the anti-rotation post 211. The second anti-rotation part 212 can be engaged with the first anti-rotation part B2 of the bolt B of the brake disc 1 to prevent the anti-rotation component 21 from rotating relative to the other component. The second anti-rotation part 212 is hexagonal in shape. The lower screw hole 213 is axially opened from the bottom surface of the anti-rotation post 211.

[0048] like Figure 6 and Figure 7 As shown, the connecting bolt 22 is screwed into the screw hole 153 by the sinker hole 154 of the mounting base 10, and the connecting bolt 22 is screwed into the lower screw hole 213 of the anti-rotation member 21, thereby fixing the anti-rotation member 21 and adjusting and limiting the axial position of the anti-rotation member 21 in the anti-rotation hole 151.

[0049] like Figure 6 and Figure 7 As shown, bushing 25 is provided in bushing hole 17 of mounting base 10, and bushing 25 has a positioning hole 251.

[0050] When assembling the brake disc 1, the assembly fixture 2 is used to first insert the first anti-rotation part B2 of the head B1 of the bolt B into the second anti-rotation part 212 of the anti-rotation member 21. Then, the hub housing 1a and the disc 1b are fitted onto the bolt, followed by manual or automated mechanical tightening of the nut N. When tightening the nut N, the engagement of the second anti-rotation part 212 of the anti-rotation member 21 with the first anti-rotation part B2 of the bolt B prevents the bolt B from rotating, facilitating the screwing of the nut N onto the bolt B. Secondly, the connecting bolt 22 is screwed into the lower threaded hole 213 of the anti-rotation member 21, which fixes the axial position of the anti-rotation member 21 and prevents its axial displacement. Furthermore, the two upper grooves 14 of the mounting base 10 communicate with the top surface 12, allowing for easy access for the hand to remove and place the brake disc 1. Moreover, the two lower grooves 19 of the mounting base 10 communicate with the bottom surface 11, allowing for easy access for the hand to move the assembly fixture 2. Therefore, this embodiment effectively achieves the purpose of this utility model.

[0051] On the other hand, such as Figure 9 and Figure 10 As shown, this utility model also provides a brake disc 1 assembly machine 3, which uses a brake disc 1 assembly fixture 2 as described above, and can automatically lock the nut N.

[0052] like Figure 9 , Figure 10 and Figure 11 As shown, the assembly machine 3 includes a bearing device 30, two slot limiting members 41, two side limiting members 42, a rear limiting member 43, a position sensor S, a fixing device 50, a nut providing device 60, a displacement device 70, a screwing device 80, and an exiting device 90.

[0053] like Figures 9 to 12 As shown, the support device 30 is used to support the assembly fixture 2. The support device 30 includes multiple rolling elements 31 and two guide elements 32. The rolling elements 31 are used to support the assembly fixture 2 to facilitate displacement. The two limiting edges 162 of the assembly fixture 2 are respectively guided by the guide elements 32 of the support device.

[0054] like Figures 9 to 12 As shown, the groove limiting member 41 is used to cooperate with the limiting groove 161 of the assembly fixture 2. The groove limiting member 41 can prevent the assembly fixture 2 from detaching upward from the assembly machine 3, and can guide the assembly fixture 2 to slide along the axial direction of the limiting groove 161 to a specific position inside the assembly machine 3 for the nut N locking operation.

[0055] like Figures 9 to 12 As shown, the edge limiting member 42 is used to guide and limit the left and right positions of the limiting edge 162 of the assembly fixture 2 so that the assembly fixture 2 can be smoothly pushed into a specific position inside the assembly machine 3.

[0056] like Figures 9 to 12As shown, the rear limiter 43 is used to limit and stop the stop edge 18 of the assembly fixture 2, so that the assembly fixture 2 will not move forward and the assembly fixture 2 is in the position to be fixed.

[0057] like Figures 9 to 12 As shown, the position sensor S can detect the position of the assembly fixture 2 and sense the edge 18 of the assembly fixture 2. In this embodiment, it detects whether the assembly fixture 2 has reached the position to be fixed.

[0058] like Figures 9 to 12 As shown, the fixing device 50 is used to fix the assembly fixture 2. The fixing device 50 has a cylinder 51, a pressure plate 52, and two positioning pins 53 fixed to the pressure plate 52. The cylinder 51 can drive the pressure plate 52 to move up and down, thereby allowing the pressure plate 52 to descend and enter the limiting groove 161 of the assembly fixture 2, so that the pressure plate 52 can press against the limiting edge 162 of the assembly fixture 2. At this time, the positioning pins 53 will be inserted into the positioning holes 251 of the assembly fixture 2. Figure 13 As shown, the fixed assembly fixture 2 is placed in the position to be fixed.

[0059] In detail, when the position sensor S detects that the assembly fixture 2 has reached the position to be fixed, it controls the fixing device 50 to move, so that the pressure plate 52 descends and presses against the limiting edge 162 of the assembly fixture 2, so that the positioning pin 53 is inserted into the positioning hole 251 of the assembly fixture 2, and the assembly fixture 2 is fixed relative to the assembly machine 3 and will not move.

[0060] like Figures 9 to 12 As shown, the nut supply device 60 can vibrately arrange and transport the nut N to a predetermined position.

[0061] like Figures 9 to 12 As shown, the displacement device 70 can be displaced relative to the bearing device 30. In this embodiment, the displacement device 70 consists of three displacement elements: X-axis, Y-axis, and Z-axis. However, this utility model is not limited to this and can be replaced with other various displacement devices, such as a multi-axis robotic arm.

[0062] like Figures 9 to 12 As shown, the screw-on device 80 is located on the displacement device 70, and can take the nut N and lock the nut N to the bolt B of the brake disc 1.

[0063] In this embodiment, the assembly machine 3 uses various data to locate the coordinates of bolt B and then attaches nut N to bolt B. In another embodiment of this invention, an image recognition device can be used to locate nut N for use, and the image recognition device can be used to locate the position of bolt B and attach nut N to bolt B.

[0064] like Figures 9 to 12 As shown, the withdrawal device 90 is used to abut against the retaining edge 18 of the assembly fixture 2, causing the assembly fixture 2 to displace and withdraw. In this embodiment, the withdrawal device 90 is a pneumatic cylinder rod, but this utility model is not limited to that.

[0065] As can be seen from the above description, the assembly machine 3 provided by this utility model is mounted on the rolling element 31 via the assembly fixture 2, which can be easily moved. Secondly, the assembly fixture 2 is accurately and securely fixed to the assembly machine 3 by the fixing device 50 positioning and pressing against it. Furthermore, by sensing the stop edge 18 of the assembly fixture 2 through the position sensor S, it can be accurately determined whether the assembly fixture 2 has reached the position to be fixed. Moreover, by the retraction device 90 pressing against the stop edge 18 of the assembly fixture 2, the assembly fixture 2 can be quickly pushed back and withdrawn. Therefore, this embodiment indeed achieves the purpose of this utility model.

[0066] Finally, it must be stated again that the constituent elements disclosed in the foregoing embodiments of this utility model are merely illustrative examples and are not intended to limit the scope of patent protection in this case. Substitutions or variations of other equivalent elements should also be covered by the scope of patent protection in this case.

Claims

1. A brake disc assembly fixture, suitable for securing a hub housing and a disc of the brake disc together by a plurality of bolts and a plurality of nuts, each bolt having a head and a first anti-rotation portion located at the head; characterized in that, The assembly fixture includes: A mounting base has a bottom surface, a top surface opposite the bottom surface, a recessed portion formed by the top surface for accommodating the hub housing and the disc, and a plurality of anti-rotation holes that pass through the recessed portion and correspond to the first anti-rotation portions of each bolt of the brake disc. Multiple anti-rotation elements are respectively disposed in the anti-rotation holes of the mounting base, and each of the anti-rotation elements has a second anti-rotation part for cooperating with the first anti-rotation part of each bolt to prevent rotation.

2. The assembly fixture for the brake disc as described in claim 1, characterized in that: The mounting base also has a plurality of screw holes that are respectively connected to each of the anti-rotation holes, and each of the anti-rotation components has a lower screw hole. The assembly fixture also includes a plurality of connecting bolts, which are respectively screwed into each of the screw holes of the mounting base and the lower screw holes of each of the anti-rotation components.

3. The assembly fixture for the brake disc as described in claim 1, characterized in that: An escape hole is formed at the opening of each of the anti-rotation holes of the mounting base for accommodating the head of the bolt.

4. The assembly fixture for the brake disc as described in claim 1, characterized in that: The mounting base has two opposing limiting grooves, which allow for the insertion of two limiting components of an assembly machine.

5. The assembly fixture for the brake disc as described in claim 4, characterized in that: The mounting base has two upper grooves located on opposite sides and extending to the top surface, and the upper grooves communicate with the limiting groove.

6. The assembly fixture for the brake disc as described in claim 1, characterized in that: The mounting has two upper grooves located on opposite sides and extending to the top surface.

7. The assembly fixture for the brake disc as described in claim 1, characterized in that: The mounting base has two lower grooves located on opposite sides and communicating with the bottom surface.

8. The assembly fixture for the brake disc as described in claim 1, characterized in that: The mounting base has two opposing limiting edges, which respectively cooperate with the two limiting members that move on the assembly machine.

9. The assembly fixture for the brake disc as described in claim 1, characterized in that: The mounting base has two opposing limiting edges, which are pressed against by two vertically movable pressure plates of an assembly machine.

10. The assembly fixture for the brake disc as described in claim 1, characterized in that: The mounting base has multiple positioning holes for inserting multiple positioning pins of an assembly machine.

11. A brake disc assembly machine, comprising: A jig assembly, characterized in that The assembly fixture includes: A mounting base has a bottom surface, a top surface opposite the bottom surface, and a recessed portion formed by the top surface for accommodating a hub housing and a disc. Multiple anti-rotation components are fixed to the mounting base to fix and prevent rotation of multiple bolts used to lock the hub housing and the disc. A support device for supporting the assembly fixture; A fixing device for fixing the assembly fixture; A nut providing device for providing a plurality of nuts for locking onto each of the bolts; A displacement device capable of displacement relative to the supporting device; A screw-setting device is provided on the displacement device for picking up each of the nuts and locking each of the nuts onto each of the bolts.

12. The brake disc assembly machine as described in claim 11, characterized in that: The supporting device includes multiple rolling elements, and the assembly fixture moves on the rolling elements.

13. The brake disc assembly machine as described in claim 11, characterized in that: It also includes two groove limiting members located on opposite sides, and the assembly fixture includes two limiting grooves that respectively accommodate the two groove limiting members.

14. The brake disc assembly machine as described in claim 11, characterized in that: It also includes two side limiting members located on opposite sides, and the assembly fixture includes two limiting edges located next to the two side limiting members.

15. The brake disc assembly machine as described in claim 11, characterized in that: It also includes a position sensor for detecting the position of the assembly fixture and controlling the fixing device to fix the assembly fixture.

16. The brake disc assembly machine as described in claim 11, characterized in that: The fixing device includes a pressure plate that can move up and down, and the assembly fixture includes two limiting edges that are pressed against by the pressure plate of the fixing device.

17. The brake disc assembly machine as described in claim 11, characterized in that: The fixing device includes a plurality of positioning posts, and the assembly fixture includes a plurality of positioning holes that respectively mate with the positioning posts of the fixing device.

18. The brake disc assembly machine as described in claim 11, characterized in that: The carrier device includes two opposing guide members, and the assembly fixture includes two opposing limiting edges that are respectively guided by the guide members of the carrier device.

19. The brake disc assembly machine as described in claim 11, characterized in that: It also includes a retractable exit device, the assembly fixture having a stop edge, the exit device being used to abut against the stop edge of the assembly fixture to displace and exit the assembly fixture.

20. The brake disc assembly machine as described in claim 11, characterized in that: It also includes a rear limiter, the assembly fixture including a stop edge, the rear limiter being used to stop the stop edge of the assembly fixture from advancing.

21. The brake disc assembly machine as described in claim 11, characterized in that: The mounting base has multiple anti-rotation holes communicating with the recessed portion, and each of the anti-rotation members is respectively disposed in the anti-rotation hole of the mounting base, and the anti-rotation member is used to abut against the bolt.

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