A trailing arm assembly assembly device

Abstract

The utility model discloses a longitudinal arm assembly assembling device, at least two different specifications' bolts are needed on the longitudinal arm assembly, include: conversion head mechanism and tighten axle mechanism, conversion head mechanism has conversion sleeve, one end of conversion sleeve is adapted with one specification's bolt, the other end of conversion sleeve is hexagonal head, and the hexagonal head is same specification with another specification's bolt, tighten axle mechanism has tighten sleeve, and the tighten sleeve is adapted with the hexagonal head respectively, another specification's bolt. The utility model discloses bolt torsion automatic tightening, is favorable to reduce the artificial labor intensity, improves production efficiency, and single tighten axle can realize two different specifications' bolt tightening, reduces the use amount of one tighten axle, reduces the equipment cost.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive parts, and in particular to a trailing arm assembly assembly device. Background Technology

[0002] The rear trailing arm assembly module is a crucial component of the vehicle chassis. Its front end connects primarily to the vehicle body, while its rear end connects to the brake and steering knuckle, forming the rear suspension structure. The rear trailing arm assembly module plays a vital role in vehicle traction, ensuring stability during towing and handling. Since the trailing arm needs to connect to the trailing arm bracket and steering knuckle, the bolt assembly must meet torque design requirements to prevent bolt torque degradation during vehicle operation, which could lead to abnormal noises.

[0003] Defects in existing assembly technology: Each piece of the trailing arm assembly takes about 3 minutes to assemble, and the manual assembly process results in low work efficiency. Long-term manual operation can lead to fatigue, is not in line with human-machine engineering, and torque cannot be guaranteed 100%. The sleeve needs to be changed frequently, which is complicated and cannot meet the needs of mass production. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a trailing arm assembly assembly device that automatically tightens bolts by torque, which helps to reduce manual labor intensity, improve production efficiency, and enable a single tightening shaft to tighten two different specifications of bolts, thereby reducing the number of tightening shafts used and lowering equipment costs.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A trailing arm assembly assembly device, wherein the trailing arm assembly requires at least two bolts of different specifications, includes: a conversion head mechanism and a tightening shaft mechanism; The conversion head mechanism has a conversion sleeve, one end of which is adapted to a bolt of one specification, and the other end of which is a hexagonal head that is the same specification as a bolt of another specification. The tightening shaft mechanism has a tightening sleeve, which is adapted to the hexagonal head and another type of bolt.

[0006] The aforementioned trailing arm assembly assembly device further includes a positioning mechanism, which positions and clamps the trailing arm assembly.

[0007] The aforementioned trailing arm assembly assembly device includes a positioning mechanism comprising a first clamping component and a second clamping component, wherein the first clamping component and the second clamping component respectively clamp the two ends of the trailing arm assembly.

[0008] The aforementioned trailing arm assembly assembly device includes a trailing arm, a brake assembly, and a trailing arm bracket. The trailing arm bracket is fixedly connected to the trailing arm by at least one bolt of one specification, and the trailing arm is fixedly connected to the brake assembly by at least one bolt of another specification.

[0009] The aforementioned trailing arm assembly assembly, wherein the conversion head mechanism includes: The column is provided with a longitudinal guide rail; A support, which is slidably mounted on the guide rail; A conversion head drive is provided on the column and is connected to the support in a transmission manner to drive its longitudinal movement. A bearing housing is mounted on the support, and the conversion sleeve is rotatably disposed within the bearing housing via a bearing.

[0010] The aforementioned trailing arm assembly assembly, wherein the tightening shaft mechanism includes: A cantilever column, wherein a sliding block is provided on the cantilever column; A slide rod assembly, which is rotatably mounted on the slide block; A fixing seat is mounted on the sliding end of the slide rod assembly; A servo tightening shaft is mounted on the fixed base, and a tightening sleeve is drivenly connected to the servo tightening shaft.

[0011] The aforementioned trailing arm assembly assembly includes a slide rod assembly comprising: a first base, at least two slide rods, and a second base. The first base is rotatably mounted on the slide block, and both slide rods pass through the first base and slide in cooperation with it. The second base is mounted on the ends of the two slide rods, and the fixing seat is mounted on the second base.

[0012] In the aforementioned trailing arm assembly assembly, the two slide bars are on the same horizontal plane and are arranged in parallel.

[0013] The aforementioned trailing arm assembly assembly, wherein the first clamping component includes: The positioning frame is provided with at least two first positioning pins, and the longitudinal arm bracket is provided with at least two positioning holes, wherein the two first positioning pins are respectively positioned and engaged with the two positioning holes. At least two clamping components are installed on the positioning frame respectively, and together they press against the longitudinal arm bracket.

[0014] In the aforementioned longitudinal arm assembly assembly device, the second clamping component includes: a positioning seat and a mounting block. The brake assembly is placed on the positioning seat, and a positioning arm is provided on the mounting block. The positioning arm is rotatably connected to the mounting block, and a second positioning pin is provided on the positioning arm. The positioning arm is engaged with the brake assembly, and the second positioning pin is in a limiting engagement with the brake assembly.

[0015] Because this utility model employs the aforementioned technology, it has the following positive effects compared to existing technologies: (1) The bolt torque automatic tightening of this utility model is conducive to reducing the intensity of manual labor, improving production efficiency, and compressing the assembly cycle time of a single piece.

[0016] (2) This utility model uses a conversion sleeve, which can tighten two different specifications of bolts, M12 and M14, through a single tightening shaft, reducing the amount of tightening shaft used and reducing equipment costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the longitudinal arm assembly assembly device of this utility model.

[0018] Figure 2 This is a structural schematic diagram of the trailing arm assembly in the trailing arm assembly assembly device of this utility model.

[0019] Figure 3 This is a schematic diagram of the conversion head mechanism in the longitudinal arm assembly assembly device of this utility model.

[0020] Figure 4 This is a structural schematic diagram of the tightening shaft mechanism in the longitudinal arm assembly assembly device of this utility model.

[0021] Figure 5 This is a schematic diagram of the positioning mechanism in the longitudinal arm assembly assembly device of this utility model.

[0022] In the attached diagram: 1. Longitudinal arm assembly; 2. Bolt; 3. Converter head mechanism; 4. Tightening shaft mechanism; 5. Positioning mechanism; 6. Worktable; 7. Display screen; 8. Pneumatic switch valve; 11. Longitudinal arm; 12. Longitudinal arm bracket; 13. Brake assembly; 14. Groove; 121. Positioning hole; 21. M12 bolt; 22. M14 bolt; 211. M12 bolt head; 212. M12 nut; 31. Converter sleeve; 32. Hexagonal head; 33. Converter head drive component; 34. Bearing seat; 35. Guide rail; 36. Column; 361. Cylinder bracket; 362. Connecting bracket; 37. Bearing; 38. Sleeve body; 39. Support; 40. Lifting ring; 41. Tightening sleeve; 4 2. Cantilever column; 43. Slide rod assembly; 44. Fixed seat; 45. Servo tightening shaft; 46. Slide block; 47. First seat body; 48. Slide rod; 49. Second seat body; 50. Handle; 51. First clamping assembly; 52. Second clamping assembly; 511. Positioning frame body; 512. Pressing assembly; 513. First positioning pin; 514. Rotary cylinder; 515. Pressure bar; 516. Positioning plate; 517. Guide pin; 518. Positioning cylinder; 519. Spring; 520. Positioning base; 521. Positioning column; 522. Mounting plate; 523. Lifting cylinder; 524. Positioning seat; 525. Mounting block; 526. Positioning arm; 527. Second positioning pin; 528. Slot; Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "back", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] It should be noted that the terms "horizontal" and "vertical" in this utility model are used to describe approximate positional relationships, and not strictly "horizontal plane" or "vertical plane".

[0026] It should be noted that, unless otherwise specified, this utility model can be used at the angle shown in the accompanying drawings or at other angles.

[0027] Please see Figures 1 to 5 The diagram illustrates a preferred embodiment of a trailing arm assembly assembly device. The trailing arm assembly 1 requires at least two bolts 2 of different specifications. The trailing arm assembly assembly device includes: a conversion head mechanism 3 and a tightening shaft mechanism 4. The conversion head mechanism 3 has a conversion sleeve 31, one end of which is adapted to one of the bolts 2 of different specifications, and the other end of which is a hexagonal head 32, which is the same specification as the other bolt 2. The tightening shaft mechanism 4 has a tightening sleeve 41, which is adapted to both the hexagonal head 32 and the other bolt 2 of different specifications.

[0028] The first type of bolt 21 has an M12 specification, and the second type of bolt 22 has an M14 specification.

[0029] This utility model uses a conversion sleeve 31, which enables the tightening of two different specifications of bolts 2, M12 and M14, through a single tightening sleeve 41, reducing the amount of tightening shaft used and lowering equipment costs.

[0030] Furthermore, as a preferred embodiment, the trailing arm assembly 1 includes: a trailing arm 11, a brake assembly 13, and a trailing arm bracket 12. The trailing arm bracket 12 is fixedly connected to the trailing arm 11 by at least one bolt 2 of one specification, and the trailing arm 11 is fixedly connected to the brake assembly 13 by at least one bolt 2 of another specification.

[0031] Furthermore, the trailing arm bracket 12 is tightened and fixed to the trailing arm by one or more M12 bolts 21, and the trailing arm 11 is tightened and fixed to the brake assembly 13 by one or more M14 bolts 22.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model.

[0033] Based on the above, this utility model also has the following embodiments: In a further embodiment of the present invention, the trailing arm assembly assembly device further includes: a positioning mechanism 5, which positions and clamps the trailing arm assembly 1.

[0034] In a further embodiment of the present invention, the positioning mechanism 5 includes: a first clamping component 51 and a second clamping component 52, wherein the first clamping component 51 and the second clamping component 52 respectively clamp the two ends of the longitudinal arm assembly 1.

[0035] In a further embodiment of the present invention, the first clamping assembly 51 includes: a positioning frame 511 and at least two pressing assemblies 512. The positioning frame 511 is provided with at least two first positioning pins 513, and the longitudinal arm bracket 12 is provided with at least two positioning holes 121. The two first positioning pins 513 are respectively positioned and engaged with the two positioning holes 121. The two pressing assemblies 512 are respectively installed on the positioning frame 511 and together press against the longitudinal arm bracket 12.

[0036] Furthermore, the clamping assembly 512 includes a rotary cylinder 514 and a pressure bar 515 connected to it in a transmission manner. The rotary cylinder 514 is mounted on the positioning frame 511. The longitudinal arm bracket 12 is first positioned on the positioning frame 511 by the first positioning pin 513, and then the rotary cylinder 514 drives the pressure bar 515 to rotate and press against the longitudinal arm bracket 12, thereby pressing the longitudinal arm bracket 12 against the positioning frame 511.

[0037] Preferably, the M12 bolt includes a mating M12 bolt head 211 and an M12 nut 212.

[0038] Furthermore, the positioning frame 511 is equipped with a positioning plate 516, which has two guide pins 517. A positioning cylinder 518 is slidably connected to the two guide pins 517. A spring 519 is provided between the positioning cylinder 518 and the positioning plate 516. The positioning cylinder 518 is used to position the M12 bolt head 212. The guide pins 517 enable the positioning cylinder 518 to slide stably longitudinally. The function of the spring 519 is to generate an upward elastic force on the M12 bolt head positioning cylinder. The purpose of generating the elastic force is to make the M12 hexagonal bolt head 211 and the M12 bolt head positioning cylinder 518 fit together, ensuring the stability of the M12 nut 212 during the tightening process.

[0039] Furthermore, the positioning frame 511 includes: a positioning base 520, two positioning posts 521, and a mounting plate 522. The positioning posts 521 are longitudinally fixed on the positioning base 520, and the mounting plate 522 is fixedly mounted on the two positioning posts 521. Two first positioning pins 513 are provided on the mounting plate 522, and two clamping components 512 are respectively mounted on the two positioning posts 521. At least one linearly driven lifting cylinder 523 is provided at the bottom of the mounting plate 522. The lifting cylinder 523 is connected to the positioning cylinder 518 in a transmission manner. The lifting cylinder 523 drives the positioning cylinder 518 to move up and down, thereby realizing the longitudinal movement of the M12 bolt head 211 on the positioning cylinder 518.

[0040] In a further embodiment of the present invention, the second clamping assembly 52 includes: a positioning seat 524 and a mounting block 525. The brake assembly 13 is placed on the positioning seat 524. The mounting block 525 is provided with a positioning arm 526. The positioning arm 526 is rotatably connected to the mounting block 525. The positioning arm 526 is provided with a second positioning pin 527. The positioning arm 526 is engaged with the brake assembly 13. The second positioning pin 527 is in a limiting cooperation with the brake assembly 13.

[0041] Furthermore, the positioning seat 524 has a slot 528, into which the brake assembly 13 is inserted to achieve lateral limiting. The brake assembly 13 has a groove 14, into which the positioning arm 526 rotates to achieve lateral limiting between the positioning arm 526 and the brake assembly 13. The second positioning pin 527 then positions the brake assembly 13, thus fixing the brake assembly 13. When removing the brake assembly 13, it can only be removed longitudinally. Since the positioning arm 526 is a rotating structure, it cannot be raised or lowered longitudinally. Therefore, the brake assembly 13 is fixed. Only after disengaging the positioning engagement between the second positioning pin 527 and the brake assembly 13, and then disengaging the limiting engagement between the positioning arm 526 and the groove 14, can the brake assembly 13 be removed longitudinally.

[0042] In a further embodiment of this utility model, the conversion head mechanism 3 includes: a column 36, a support 39, a conversion head drive component 33, and a bearing seat 34. A guide rail 35 is longitudinally provided on the column 36, the support 39 is slidably disposed on the guide rail 35, the conversion head drive component 33 is disposed on the column 36, and the conversion head drive component 33 is connected to the support 39 in a transmission connection to drive its longitudinal movement. The bearing seat 34 is installed on the support 39, and the conversion sleeve 31 is rotatably disposed in the bearing seat 34 through the bearing 37.

[0043] Furthermore, the converter head drive component 33 is a converter head cylinder.

[0044] Preferably, the converter head drive unit 33 is fixed to the column 36 by one or more cylinder brackets 361.

[0045] Preferably, the converter head drive unit 33 is fixedly connected to the support 39 via the connecting bracket 362, thereby driving the support 39 to move up and down.

[0046] Furthermore, the conversion sleeve 31 includes a longitudinally fixed rotating shaft 32 and a sleeve body 38. The sleeve body 38 is adapted to the first specification bolt 2, that is, it is adapted to the M12 bolt 21. The rotating shaft 32 has a hexagonal head structure and is the same specification as the second specification bolt, that is, the same as the M14 bolt 22.

[0047] In a further embodiment of the present invention, the tightening shaft mechanism 4 includes: a cantilever column 42, a slide rod assembly 43, a fixed seat 44, and a servo tightening shaft 45. The cantilever column 42 is provided with a slide seat 46, the slide rod assembly 43 is rotatably mounted on the slide seat 46, the fixed seat 44 is mounted on the sliding end of the slide rod assembly 43, the servo tightening shaft 45 is mounted on the fixed seat 44, and the tightening sleeve 41 is drivenly connected to the servo tightening shaft 45.

[0048] Furthermore, the slide 46 can be fixed to the cantilever column 42 or slide longitudinally on the cantilever column 42. When fixedly connected, the slide rod assembly 43, the fixed seat 44, and the servo tightening shaft 45 cannot move longitudinally as a whole. When slidably connected, the slide rod assembly 43, the fixed seat 44, and the servo tightening shaft 45 can move longitudinally as a whole. The sliding connection can be achieved by setting a ball screw structure inside the cantilever column 42 to drive the slide, or by setting a damping structure between the slide 46 and the cantilever column, so that the slide is automatically fixed after being manually slid.

[0049] In a further embodiment of the present invention, the slide rod assembly 43 includes: a first base 47, at least two slide rods 48 and a second base 49. The first base 47 is rotatably mounted on the slide block 46. The two slide rods 48 pass through the first base 47 and slide in cooperation with it. The second base 49 is installed at the ends of the two slide rods 48 and a fixing seat 44 is installed on the second base 49.

[0050] In a further embodiment of this utility model, the two sliding rods 48 are on the same horizontal plane and are arranged in parallel, which can achieve relatively stable horizontal sliding.

[0051] Furthermore, at least one lifting ring 40 is provided on the first seat 47.

[0052] Furthermore, a handle 50 is provided on the mounting base 44.

[0053] By holding the handle 50, the servo tightening shaft position can be swung in any direction to tighten the M12 and M14 bolts; the lifting ring 40 is connected to the slide rod assembly 43 and fixed to the crossbeam with a zipper.

[0054] Furthermore, the trailing arm assembly assembly also includes: a worktable 6, on which the first clamping assembly 51, the second clamping assembly 52, the conversion head mechanism 3, and the tightening shaft mechanism 4 are all mounted.

[0055] Furthermore, the trailing arm assembly assembly also includes a display screen 7, which is mounted on the worktable 6.

[0056] Furthermore, the servo tightening shaft 45 has a torque detection function, which can monitor the torque value during the tightening process in real time, and is connected to the display screen 7. The display screen 7 records the torque value and stores the torque data. By setting different tightening parameters in the system, the servo tightening shaft 45 can tighten bolts of both M12 and M14 specifications, thus achieving the error prevention function.

[0057] This invention enables torque monitoring and automatically collects data on bolt torque plus rotation angle, facilitating batch traceability of parts.

[0058] Furthermore, the workbench 6 is also equipped with a pneumatic switch valve 8, which is connected to the rotary cylinder 514 and the lifting cylinder 523. Its function is to simultaneously control the rotary cylinder 514 and the lifting cylinder 523, which respectively clamp the longitudinal arm support 12 and the lifting cylinder 523.

[0059] Before the trailing arm assembly 1 is fitted into the positioning mechanism 5, the first step is to manually insert the M12 hex bolt 21 from bottom to top through the mounting holes of the trailing arm bracket 12 and the trailing arm 11. The second step is to fit the assembly into the positioning mechanism 5. The positioning mechanism 5 is equipped with a first positioning pin 513, which is used to position the trailing arm bracket 12. Since the M12 hex bolt 21 is inserted from bottom to top, the M12 bolt head 211 is at the bottom. The positioning mechanism 5 is equipped with an M12 bolt head positioning sleeve 518, which is used to fit the M12 hex bolt head 211 into the inner hexagonal groove of the M12 bolt positioning sleeve 518 to prevent it from rotating.

[0060] The cylinder body of the lifting cylinder 523 is fixed on the mounting plate 522, and the piston rod end is fixed to the M12 bolt head positioning cylinder 518. When the cylinder piston rod extends downward, the M12 bolt head positioning cylinder 518 is in the reset state, and when the cylinder piston rod extends upward, the M12 bolt head positioning cylinder 518 is in the working state.

[0061] The M12 bolt head positioning cylinder 518 is clearance-fitted with the guide pin 518, and a spring 519 is installed at the bottom. The function of the spring 519 is to generate an upward elastic force on the M12 bolt head positioning cylinder. The purpose of generating the elastic force is to make the M12 hexagonal bolt head 511 and the M12 bolt head positioning cylinder 518 fit together, ensuring the stability of the M12 nut 512 during the tightening process.

[0062] The operating steps of this utility model are as follows: Step S1: Position and fix the longitudinal arm assembly 11 on the first clamping assembly 51 and the second clamping assembly 52; Step S2: By hand, pass the M12 hex bolt 21 through the mounting holes of the longitudinal arm bracket 12 and the longitudinal arm 11 from bottom to top, and then put the whole part into the first positioning pin 513 for positioning. Start the pneumatic switch valve 8, and the rotating cylinder 514 drives the pressure bar 515 to clamp the longitudinal arm bracket 12. Step S3: Tighten the M12 nut 212 into the M12 hex bolt by hand, 1-2 threads; Step S4: Use a barcode scanner to scan the QR code on the workpiece and input the data into the computer; Step S5: Hold the handle 50 with your hand and align the servo tightening shaft 45 with the three bolts of the M14 hex bolt 22 and tighten them. Step S6: After tightening the three bolts of M14 hex bolt 22, the converter cylinder 33 in the converter mechanism 3 moves downward, puts the converter sleeve 31 into the M12 nut, and holds the handle 50 to align the servo tightening shaft 45 with the hex head 32 at the upper end of the converter sleeve 31 for tightening. During the operation, it is not necessary to replace the sleeve by hand, and it can be completed in one go in the converter mechanism 3. Step S7: Manually activate the pneumatic switch valve 8 to remove the longitudinal arm assembly 1 and complete the assembly.

[0063] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A trailing arm assembly assembly device, wherein the trailing arm assembly requires at least two bolts of different specifications, characterized in that, include: Converter head mechanism and tightening shaft mechanism; The conversion head mechanism has a conversion sleeve, one end of which is adapted to a bolt of one specification, and the other end of which is a hexagonal head that is the same specification as a bolt of another specification. The tightening shaft mechanism has a tightening sleeve, which is adapted to the hexagonal head and another type of bolt.

2. The trailing arm assembly assembly device according to claim 1, characterized in that, Also includes: A positioning mechanism that positions and clamps the longitudinal arm assembly.

3. The trailing arm assembly assembly device according to claim 2, characterized in that, The positioning mechanism includes a first clamping component and a second clamping component, wherein the first clamping component and the second clamping component respectively clamp the two ends of the longitudinal arm assembly.

4. The trailing arm assembly assembly device according to claim 3, characterized in that, The trailing arm assembly includes: a trailing arm, a brake assembly, and a trailing arm bracket. The trailing arm bracket is fixedly connected to the trailing arm by at least one bolt of one specification, and the trailing arm is fixedly connected to the brake assembly by at least one bolt of another specification.

5. The trailing arm assembly assembly device according to claim 1, characterized in that, The converter head mechanism includes: The column is provided with a longitudinal guide rail; A support, which is slidably mounted on the guide rail; A conversion head drive is provided on the column and is connected to the support in a transmission manner to drive its longitudinal movement. A bearing housing is mounted on the support, and the conversion sleeve is rotatably disposed within the bearing housing via a bearing.

6. The trailing arm assembly assembly device according to claim 1, characterized in that, The tightening shaft mechanism includes: A cantilever column, wherein a sliding block is provided on the cantilever column; A slide rod assembly, which is rotatably mounted on the slide block; A fixing seat is mounted on the sliding end of the slide rod assembly; A servo tightening shaft is mounted on the fixed base, and a tightening sleeve is drivenly connected to the servo tightening shaft.

7. The trailing arm assembly assembly device according to claim 6, characterized in that, The slide rod assembly includes: a first base, at least two slide rods, and a second base. The first base is rotatably mounted on the slide block. Both slide rods pass through the first base and slide in cooperation with it. The second base is installed at the ends of the two slide rods, and the fixing seat is installed on the second base.

8. The trailing arm assembly assembly device according to claim 7, characterized in that, The two slide bars are on the same horizontal plane and are arranged in parallel.

9. The trailing arm assembly assembly device according to claim 4, characterized in that, The first clamping assembly includes: The positioning frame is provided with at least two first positioning pins, and the longitudinal arm bracket is provided with at least two positioning holes, wherein the two first positioning pins are respectively positioned and engaged with the two positioning holes. At least two clamping components are installed on the positioning frame respectively, and together they press against the longitudinal arm bracket.

10. The trailing arm assembly assembly device according to claim 4, characterized in that, The second clamping assembly includes a positioning seat and a mounting block. The brake assembly is placed on the positioning seat, and a positioning arm is provided on the mounting block. The positioning arm is rotatably connected to the mounting block, and a second positioning pin is provided on the positioning arm. The positioning arm is engaged with the brake assembly, and the second positioning pin is in a limiting engagement with the brake assembly.

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