Assembly apparatus for brake and shock absorber

Abstract

The utility model provides a kind of equipment for assembling brake and shock absorber, including workbench, brake fixed assembly and shock absorber fixed assembly.Brake fixed assembly is located on workbench, and brake fixed assembly includes positioning disc and first pressing part, and positioning disc is used to carry brake, and first pressing part can be moved to the top of positioning disc.Shock absorber fixed assembly is located in brake fixed assembly side edge, and shock absorber fixed assembly includes support and second pressing part, and the top of support is formed with arc support surface, and the center axis of support surface has preset angle with the plane where positioning disc is located, and second pressing part can be moved to the top of support surface.The positioning disc and support of the utility model can be positioned brake and shock absorber respectively, and improve the assembly accuracy of brake and shock absorber.Support surface has preset angle with horizontal plane, and the placing angle of shock absorber can be directly controlled by support surface, and then the camber angle of the wheel of unmanned vehicle is indirectly accurately controlled.

Description

Technical Field

[0001] This utility model belongs to the field of unmanned vehicle assembly technology, specifically relating to an assembly device for brakes and shock absorbers. Background Technology

[0002] In the manufacturing process of autonomous vehicles, the assembly precision of the vehicle chassis plays a decisive role in the vehicle's driving safety, handling stability, and autonomous driving control precision. The assembly of brakes and shock absorbers is a key process in the vehicle chassis assembly process.

[0003] Currently, the assembly equipment used in the assembly of brakes and shock absorbers for unmanned vehicles is relatively simple, mostly consisting of fixed brackets or specialized tooling with poor versatility. There is no precise positioning structure designed for the assembly process of brakes and shock absorbers. Operators can only rely on their own experience to complete the alignment and assembly operations, which leads to insufficient positioning accuracy of brakes and shock absorbers, making it difficult to meet the front wheel camber angle requirements. This directly affects the tire contact with the ground, driving resistance, and steering system return performance of the unmanned vehicle.

[0004] In addition, after the brake and shock absorber are assembled, the resulting sub-assembly component is relatively heavy, usually weighing 20-30 kg. Assemblers need to manually lift or move this sub-assembly component to complete the subsequent alignment, installation and transfer operations. Long-term high-intensity physical labor not only easily makes assemblers feel fatigued and increases the risk of work-related injuries, but also further reduces the assembly accuracy due to the instability of manual operation.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide an assembly device for brakes and shock absorbers, which solves the problem of insufficient positioning accuracy during the assembly of brakes and shock absorbers.

[0007] To achieve the above objectives, a specific embodiment of this utility model provides an assembly device for a brake and a shock absorber, including a worktable, a brake fixing assembly, and a shock absorber fixing assembly. The brake fixing assembly is disposed on the worktable and includes a positioning plate and a first clamping member. The positioning plate supports the brake, and the first clamping member can be controllably moved above the positioning plate to cooperate with the positioning plate in clamping the brake. The shock absorber fixing assembly is disposed on the worktable and located beside the brake fixing assembly. The shock absorber fixing assembly includes a support member and a second clamping member. The top of the support member forms an arc-shaped support surface, and the central axis of the support surface has a preset angle with the plane where the positioning plate is located. The second clamping member can be controllably moved above the support surface to cooperate with the support surface in clamping the shock absorber.

[0008] In one or more embodiments of the present invention, the assembly equipment further includes a first base plate that supports the brake fixing assembly. A pivot shaft is connected to the side of the first base plate away from the shock absorber fixing assembly. The pivot shaft is perpendicular to the arrangement direction of the brake fixing assembly and the shock absorber fixing assembly. The first base plate can pivot controllably around the pivot shaft.

[0009] In one or more embodiments of the present invention, the assembly equipment further includes a lifting assembly disposed below the workbench, the lifting assembly being used to drive the brake fixing assembly to move in the vertical direction.

[0010] In one or more embodiments of this utility model, the assembly equipment further includes a second base plate, and the lifting assembly includes a lifting hydraulic cylinder, a connecting plate disposed at the top of the lifting hydraulic cylinder, and at least two guide columns disposed on the top surface of the connecting plate. The guide columns pass through the worktable and are connected to the second base plate. The first base plate is pivotally connected to the second base plate via a pivot shaft.

[0011] In one or more embodiments of this utility model, the brake fixing assembly includes a first quick-press caliper, and a first clamping member is disposed on the pressure head of the first quick-press caliper; when the operating handle of the first quick-press caliper pivots in a first direction, the first clamping member and the positioning plate cooperate to clamp the brake.

[0012] In one or more embodiments of the present invention, a support groove for accommodating a shock absorber is formed on the top of the support member, and a support surface is formed at the bottom of the support groove, and the support surface is set as an arc surface.

[0013] In one or more embodiments of this utility model, a clamping groove for accommodating a shock absorber is formed on the second clamping member, and a clamping surface is formed at the bottom of the clamping groove. The clamping surface is set as an arc surface, and the radius of the clamping surface is larger than the radius of the supporting surface.

[0014] In one or more embodiments of the present invention, the assembly equipment further includes a clamping component disposed on the side of the shock absorber fixing component away from the brake fixing component. The clamping component includes a clamping member that can move along the clamping direction to abut against the shock absorber. The clamping direction is parallel to the central axis of the support surface.

[0015] In one or more embodiments of this utility model, at least two support members are provided and arranged along the arrangement direction of the brake fixing assembly and the shock absorber fixing assembly. In the direction close to the brake fixing assembly, the height of the multiple support surfaces decreases sequentially.

[0016] In one or more embodiments of this utility model, the assembly equipment further includes a frame that supports the workbench, and the bottom of the frame is equipped with two directional wheels and two omnidirectional wheels.

[0017] In one or more embodiments of this utility model, the shock absorber fixing assembly further includes a second quick-press clamp, and a second clamping member is disposed on the pressure head of the second quick-press clamp. When the operating handle of the second quick-press clamp pivots in the second direction, the second clamping member and the support surface cooperate to clamp the shock absorber.

[0018] Compared with existing technologies, this invention uses a positioning plate and a support component to position the brake and shock absorber separately, improving the assembly accuracy of the brake and shock absorber. Furthermore, the support surface has a preset angle with the horizontal plane, allowing direct control of the shock absorber's placement angle, thereby indirectly and precisely regulating the wheel camber angle of the autonomous vehicle. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a side view of the assembly equipment for the brake and shock absorber in a working state according to an embodiment of the present invention;

[0021] Figure 2 This is a side view of the assembly equipment for the brake and shock absorber in another working state according to one embodiment of the present invention.

[0022] Figure 3 This is a front view of the brake fixing assembly in one embodiment of the present invention;

[0023] Figure 4 This is a side view of the brake fixing assembly in a flipped state according to one embodiment of the present invention.

[0024] Figure 5 This is a front view of the shock absorber fixing assembly in one embodiment of the present invention.

[0025] Key reference numerals in the attached drawings: 1. Workbench; 2. Brake fixing assembly; 21. Positioning plate; 22. First clamping component; 23. First quick-press clamp; 3. Shock absorber fixing assembly; 31. Support component; 311. Support groove; 312. Support surface; 32. Second clamping component; 321. Clamping groove; 322. Clamping surface; 33. Second quick-press clamp; 4. Tightening assembly; 41. Tightening component; 5. Lifting assembly; 51. Lifting hydraulic cylinder; 52. Connecting plate; 53. Guide column; 54. Guide sleeve; 6. First base plate; 7. Second base plate; 8. Pivot shaft; 9. Frame; 10. Directional wheel; 11. Universal wheel. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0027] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "second" and "first" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "second" or "first" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Reference Figures 1 to 5 As shown, one embodiment of this application provides an assembly device for a brake and a shock absorber. The assembly device includes a workbench 1, a brake fixing component 2, a shock absorber fixing component 3, and a frame 9.

[0030] Specifically, the workbench 1 is located at the top of the frame 9. The frame 9 sets the workbench 1 at a specific height, facilitating the assembly of brakes and shock absorbers on the workbench 1. The brake fixing assembly 2, shock absorber fixing assembly 3, and clamping assembly 4 are all located on the top surface of the workbench 1 and are arranged roughly in a straight line. The shock absorber fixing assembly 3 is located between the brake fixing assembly 2 and the clamping assembly 4. The brake fixing assembly 2 includes a positioning plate 21 and a first clamping member 22. The positioning plate 21 is located on the workbench 1 and is used to support the brake. The positioning plate 21 is roughly configured as a cylindrical platform structure. The first clamping member 22 can be controllably moved above the positioning plate 21. When the first clamping member 22 is above the positioning plate 21, it can cooperate with the positioning plate 21 to clamp the brake, confining the brake between the two. The shock absorber fixing assembly 3 is mounted on the workbench 1 and located on the side of the brake fixing assembly 2. The shock absorber fixing assembly 3 includes a support member 31 and a second clamping member 32. The top of the support member 31 forms an arc-shaped support surface 312. The central axis of the support surface 312 is inclined and extends downward, forming a preset angle with the plane where the positioning plate 21 is located. The second clamping member 32 can be controllably moved above the support surface 312. When the second clamping member 32 is above the support surface 312, it can cooperate with the support surface 312 to clamp the shock absorber, confining the shock absorber between the two.

[0031] When assembling the brake and shock absorber, the assembler can first place the brake, which has a disc-like structure, flat on the positioning plate 21, and roughly align the central axis of the brake with the central axis of the positioning plate 21. During this process, the positioning plate 21 can play a positioning role, making it easier for the assembler to quickly determine the placement position of the brake. Then, the assembler moves the first clamping member 22 to the top of the brake and holds it against the brake. The positioning plate 21 and the first clamping member 22 cooperate to clamp and fix the brake.

[0032] After securing the brake, the assembler can place the shock absorber, which resembles a round rod structure, on the support surface 312 along its central axis, aligning it with the brake. During this process, the support surface 312 acts as a positioning element, allowing the assembler to quickly determine the shock absorber's placement and angle. Then, the assembler moves the second clamping member 32 to the top of the shock absorber and holds it against it. The support surface 312 and the second clamping member 32 work together to clamp and secure the shock absorber. After installing bolts and other connecting components at the connection point between the brake and the shock absorber, the brake and shock absorber are securely connected.

[0033] During the assembly process described above, since the shock absorber is placed along the support surface 312, the tilt angle of the shock absorber is approximately equal to the tilt angle of the central axis of the support surface 312. Therefore, the angle between the brake and the shock absorber is approximately equal to the preset angle between the tilt direction of the central axis of the support surface 312 and the horizontal plane. In practical applications, the angle between the brake and the shock absorber can be controlled by controlling the tilt angle of the central axis of the support surface 312, thereby indirectly controlling the camber angle of the unmanned vehicle's wheels.

[0034] In one embodiment, reference is made to Figure 3 As shown, the brake fixing assembly 2 also includes a first quick-press caliper 23. The first quick-press caliper 23 is a relatively common and efficient manual clamping tool, which is widely used in the field of unmanned vehicle assembly. The core structural design of the first quick-press caliper 23 is designed to achieve rapid opening and closing, thereby generating a certain clamping force to cooperate with the positioning plate 21 to clamp and fix the brake.

[0035] The first quick-pressing clamp 23 generally includes a handle, a linkage structure, and a clamping head. The linkage structure, as a force transmission component, connects the handle and the clamping head. The handle is held by the assembler to apply a corresponding force to the linkage structure. The first clamping member 22 is connected to the clamping head and is a rod-shaped structure with an elastic part, which is generally made of rubber. The elastic part is used to contact the brake and prevent scratching the brake. After the assembler applies a corresponding force to the handle, the linkage structure can transmit the corresponding force to the clamping head, driving the clamping head to move, moving the first clamping member 22 to the top of the brake and pressing it against the brake, thus clamping and fixing the brake.

[0036] Furthermore, the pivot direction of the operating handle of the first quick-pressing clamp 23 is perpendicular to the direction of the pivot axis 8. When the assembler operates the operating handle of the first quick-pressing clamp 23 to pivot in the first direction, the first clamping member 22 and the positioning plate 21 cooperate to clamp the brake. The first direction can be either clockwise or counterclockwise, and can be set according to actual needs.

[0037] In one embodiment, reference is made to Figure 2 and Figure 4 As shown, the bottom of the brake fixing assembly 2 is provided with a first base plate 6, and the positioning disc 21 and the first quick-pressing caliper 23 are both mounted on the first base plate 6. On the side away from the shock absorber fixing assembly 3, a pivot shaft 8 is connected to the first base plate 6. The pivot shaft 8 is parallel to the horizontal direction and perpendicular to the arrangement direction of the brake fixing assembly 2 and the shock absorber fixing assembly 3.

[0038] After assembling the brake and shock absorber, the assembler can move the second clamping component 32 away from the shock absorber, releasing the restriction on the shock absorber. The assembler moves the vehicle chassis to the side of the workbench 1, or moves the workbench 1 to the side of the vehicle chassis. After the assembler controls the positioning plate 21 to rotate approximately 90° around the pivot axis 88, the assembler can drive the brake and shock absorber to rotate approximately synchronously with the positioning plate 21 by 90°, so that the small assembly composed of the brake and shock absorber aligns with the corresponding part on the vehicle chassis. This facilitates the assembler to continue assembling the small assembly composed of the brake and shock absorber with the vehicle chassis, improving the overall assembly efficiency of the unmanned vehicle.

[0039] In one embodiment, reference is made to Figure 5 As shown, the top of the support member 31 is provided with a bearing groove that extends through the support surface 312 in an inclined direction. The support surface 312 is formed on the bottom of the bearing groove. The support surface 312 is generally set as an arc surface so that the support surface 312 can fit into the outer surface of the shock absorber.

[0040] In one embodiment, reference is made to Figures 1 to 3 As shown, the shock absorber fixing assembly 3 also includes a second quick-press clamp 33. The structure of the second quick-press clamp 33 is similar to that of the first quick-press clamp 23. The second quick-press clamp 33 is also a relatively common and efficient manual clamping tool.

[0041] The second clamping member 32 is connected to the pressure head of the second quick-press clamp 33. The second clamping member 32 has a clamping groove 321, and the bottom of the clamping groove 321 forms a clamping surface 322, which is also set as an arc surface. When the second clamping member 32 moves above the support surface 312 and clamps the shock absorber together, the clamping surface 322 faces the support surface 312, and the two cooperate to clamp and fix the shock absorber.

[0042] Furthermore, when the assembler operates the handle of the second quick-press clamp 33 to pivot in the second direction, the second clamping member 32 and the support surface 312 cooperate to clamp the shock absorber. The second direction can be clockwise or counterclockwise, and can be set according to actual needs. In addition, the second direction can be the same as the first direction, or it can be a different direction.

[0043] Furthermore, the radius of the pressing surface 322 is larger than the radius of the supporting surface 312. Considering that a shock absorber generally consists of a rod-shaped damper and a spring sleeved on the damper, the top of the supporting member 31 can pass through the spring along the radial direction of the shock absorber and contact the surface of the damper. The pressing surface 322 contacts the spring sleeved on the damper, thereby improving the fixing effect of the shock absorber.

[0044] Considering the shock absorber has a certain length, using a single support member 31 to support it may result in unstable support. Therefore, in one embodiment, referring to... Figure 1 and Figure 2 As shown, at least two support members 31 are provided. All support members 31 are arranged at intervals along the arrangement direction of the brake fixing assembly 2 and the shock absorber fixing assembly 3. In the direction close to the brake fixing assembly 2, the height of the support surface 312 of the support member 31 decreases sequentially, thereby providing stable support for the shock absorber through multiple support members 31.

[0045] In one embodiment, reference is made to Figure 1 and Figure 2 As shown, the assembly equipment also includes a clamping assembly 4, which is mounted on the workbench 1 and located on the side of the shock absorber fixing assembly 3 away from the brake fixing assembly 2. The clamping assembly 4 includes a clamping member 41 with the same inclination direction as the central axis of the support surface 312. The clamping member 41 can be controlled to move along the clamping direction (the clamping direction is parallel to the inclination direction of the central axis of the support surface 312). When the shock absorber is placed on the support surface 312 of the support member 31, the assembler can control the clamping member 41 to move toward the shock absorber and press against it, applying an axial thrust to the shock absorber. This causes the shock absorber to press against the brake on the other side, preventing misalignment at the mating part of the brake and shock absorber during assembly, thus improving assembly efficiency and accuracy.

[0046] The clamping assembly 4 is a relatively common and efficient manual clamping tool, widely used in the field of unmanned vehicle assembly. The core structural design of the clamping assembly 4 is designed to enable the clamping part 41 to move quickly, thereby generating a certain holding force to cooperate with the shock absorber, so that the shock absorber and the brake can hold each other.

[0047] The clamping assembly 4 generally includes a handle, a linkage structure, a guide structure, and a clamping member 41. The linkage structure, as a force transmission component, connects the handle and the clamping member 41. The clamping member 41 passes through the guide structure, which restricts the movement direction of the clamping member 41. The handle is held by the assembler to apply a corresponding force to the linkage structure. The linkage structure can transmit the corresponding force to the clamping member 41, driving the clamping member 41 to move, causing the clamping member 41 to move closer to or away from the shock absorber.

[0048] In one embodiment, reference is made to Figure 1 and Figure 2As shown, the assembly equipment also includes a lifting assembly 5 located below the workbench 1. The lifting assembly 5 is used to drive the brake fixing assembly 2 to move vertically. After the brake and shock absorber are assembled, when it is necessary to install the small assembly composed of the brake and shock absorber onto the vehicle chassis, the lifting assembly 5 can be used to lift the brake and shock absorber to a preset height, and then the first base plate 6 can be rotated to rotate the brake and shock absorber to a position where they can dock with the vehicle chassis. This can reduce the labor intensity of the assembly personnel and improve the vehicle assembly efficiency.

[0049] Furthermore, the lifting assembly 5 includes a lifting hydraulic cylinder 51, a connecting plate 52 located at the top of the lifting hydraulic cylinder 51, and at least two guide posts 53 located on the top surface of the connecting plate 52. All guide posts 53 pass through the workbench 1 and are connected to the second base plate 7.

[0050] Furthermore, in order to further restrict the movement direction of the guide column 53, a guide sleeve 54 is provided at the bottom of the worktable 1. The number of guide sleeves 54 is the same as the number of guide columns 53, and the guide columns 53 are inserted into the guide sleeves 54 one by one.

[0051] Preferably, the lifting hydraulic cylinder 51 is a foot-operated hydraulic cylinder.

[0052] In one embodiment, reference is made to Figure 1 and Figure 2 As shown, the bottom of the frame 9 is equipped with two directional wheels 10 and two omnidirectional wheels 11. The two directional wheels 10 and two omnidirectional wheels 11 are distributed at the four corners of the frame 9, and the two directional wheels 10 and two omnidirectional wheels 11 are arranged along the length of the frame 9. The directional wheels 10 and omnidirectional wheels 11 allow the assembly personnel to move the assembly equipment to any position.

[0053] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An assembly device for a brake and a shock absorber, characterized in that, The assembly equipment includes: Workbench (1); A brake fixing assembly (2) is provided on the worktable (1). The brake fixing assembly (2) includes a positioning disk (21) and a first clamping member (22). The positioning disk (21) is used to support the brake. The first clamping member (22) can be controlled to move above the positioning disk (21) to cooperate with the positioning disk (21) to clamp the brake. The shock absorber fixing assembly (3) is located on the workbench (1) and on the side of the brake fixing assembly (2). The shock absorber fixing assembly (3) includes a support member (31) and a second clamping member (32). The top of the support member (31) has an arc-shaped support surface (312). The central axis of the support surface (312) has a preset angle with the plane where the positioning disk (21) is located. The second clamping member (32) can be controlled to move above the support surface (312) to cooperate with the support surface (312) to clamp the shock absorber.

2. The assembly equipment according to claim 1, characterized in that, The assembly equipment also includes a first base plate (6) that carries the brake fixing assembly (2). The first base plate (6) is connected to a pivot shaft (8) on the side away from the shock absorber fixing assembly (3). The pivot shaft (8) is perpendicular to the arrangement direction of the brake fixing assembly (2) and the shock absorber fixing assembly (3). The first base plate (6) can pivot controllably around the pivot shaft (8).

3. The assembly equipment according to claim 2, characterized in that, The assembly equipment also includes a lifting assembly (5) located below the workbench (1), which is used to drive the brake fixing assembly (2) to move in the vertical direction.

4. The assembly equipment according to claim 3, characterized in that, The assembly equipment also includes a second base plate (7), and the lifting assembly (5) includes a lifting hydraulic cylinder (51), a connecting plate (52) located at the top of the lifting hydraulic cylinder (51), and at least two guide columns (53) located on the top surface of the connecting plate (52). The guide columns (53) pass through the workbench (1) and are connected to the second base plate (7). The first base plate (6) is pivotally connected to the second base plate (7) via a pivot shaft (8).

5. The assembly equipment according to claim 1, characterized in that, The brake fixing assembly (2) includes a first quick-press caliper (23), and the first clamping member (22) is disposed on the pressure head of the first quick-press caliper (23); When the operating handle of the first quick-press clamp (23) pivots in the first direction, the first clamping member (22) and the positioning plate (21) cooperate to clamp the brake.

6. The assembly equipment according to claim 1, characterized in that, The top of the support member (31) is formed with a support groove (311) for accommodating the shock absorber, and the support surface (312) is formed at the bottom of the support groove (311), and the support surface (312) is set as an arc surface.

7. The assembly equipment according to claim 6, characterized in that, The second clamping member (32) has a clamping groove (321) for accommodating the shock absorber. The bottom of the clamping groove (321) has a clamping surface (322). The clamping surface (322) is set as an arc surface, and the radius of the clamping surface (322) is greater than the radius of the support surface (312).

8. The assembly equipment according to claim 1, characterized in that, The assembly equipment also includes a clamping assembly (4) located on the side of the shock absorber fixing assembly (3) away from the brake fixing assembly (2), the clamping assembly (4) including a clamping member (41) movable in the clamping direction to abut against the shock absorber, the clamping direction being parallel to the central axis of the support surface (312).

9. The assembly equipment according to claim 1, characterized in that, At least two of the support members (31) are provided and arranged along the arrangement direction of the brake fixing assembly (2) and the shock absorber fixing assembly (3). In the direction close to the brake fixing assembly (2), the height of the plurality of support surfaces (312) decreases sequentially.

10. The assembly equipment according to claim 1, characterized in that, The assembly equipment also includes a frame (9) supporting the workbench (1), the bottom of which is equipped with two directional wheels (10) and two omnidirectional wheels (11); and / or, The shock absorber fixing assembly (3) also includes a second quick-press clamp (33), and the second clamping member (32) is disposed on the pressure head of the second quick-press clamp (33). When the operating handle of the second quick-press clamp (33) pivots in the second direction, the second clamping member (32) and the support surface (312) cooperate to clamp the shock absorber.

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