Automobile part positioning tool clamp
By designing a multi-functional fixture suitable for steering knuckles, the problem that traditional fixtures cannot adapt to machining at different angles is solved, and efficient and low-cost steering knuckle machining is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING HUIJIAN MASCH CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-04-21
AI Technical Summary
Traditional tooling fixtures cannot adapt to the machining requirements of steering knuckles at different angles, resulting in frequent changes, increased production costs and reduced production efficiency.
Design an automotive parts positioning fixture, including a movable plate, a first pressing assembly and a second pressing assembly, capable of simultaneously clamping two steering knuckles and adjusting the angle as needed, and using multiple methods to fix the steering knuckles to adapt to different processing requirements.
This improved the efficiency of steering knuckle processing, reduced production costs, and ensured processing accuracy and stability.
Smart Images
Figure CN224144088U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of automotive parts processing equipment, specifically to an automotive parts positioning fixture. Background Technology
[0002] The steering knuckle is a key component in the automotive chassis system, responsible for connecting the wheels to the suspension system, ensuring stable contact between the wheels and the ground during driving, and enabling accurate steering based on the driver's input. The steering knuckle has a complex structure, being a spatially irregular part with numerous machining areas and strict positional requirements for its hole systems. Therefore, specialized tooling fixtures are needed to achieve accurate positioning and clamping during the machining process.
[0003] In actual production, steering knuckles require multiple machining processes, such as rough turning, semi-finish turning, grinding, rough milling, finish milling, drilling, reaming, and tapping. Many of these processes require specialized tooling and fixtures to ensure machining accuracy and efficiency. Especially in drilling and milling processes, the steering knuckles need to be accurately positioned and clamped to prevent movement or deformation during machining, which could affect the final machining quality and product performance.
[0004] However, due to the complex structure of the steering knuckle, different tooling fixtures are required for machining parts at different angles. Traditional tooling fixtures can often only clamp parts machined at specific angles and cannot adapt to the machining needs of steering knuckles at different angles. This leads to the need for frequent tooling fixture changes during actual production, which not only increases production costs but also reduces production efficiency. Utility Model Content
[0005] In view of this, the purpose of this utility model is to provide a positioning fixture for automotive parts to solve the technical problems mentioned in the background art.
[0006] This utility model is achieved through the following technical solution:
[0007] A positioning fixture for automotive parts includes a movable plate, characterized in that: a first pressing assembly is provided on the bottom surface of the movable plate, and two sets of second pressing assemblies are provided on the top surface of the movable plate in a symmetrical arrangement;
[0008] The first pressing assembly includes a fixed plate, a first hydraulic cylinder, and a first pressure plate. The fixed plate is installed on the bottom surface of the movable plate. One end of the first hydraulic cylinder is connected to the fixed plate, and the other end extends downward. The first pressure plate is connected to the end of the first hydraulic cylinder away from the fixed plate. The bottom surfaces of the movable plate on both sides of the fixed plate are equipped with first bearing seats and positioning components. The positioning components are used to position the steering knuckle during installation.
[0009] The second press-fitting assembly includes a first clamping component and two second clamping components, which are used to clamp and fix the two steering knuckles at different angles.
[0010] Furthermore, the positioning component includes a positioning block and a positioning rod. The positioning block is detachably installed on the top surface of the movable plate. One end of the positioning rod is connected to the top surface of the positioning block, and the other end extends upward. Both the positioning block and the movable plate are provided with multiple matching first threaded holes, and a first threaded rod is screwed into the first threaded hole.
[0011] Furthermore, a first connecting hole is provided on the movable plate, which extends longitudinally through the movable plate. The first oil cylinder is slidably fitted into the connecting hole. Both the fixed plate and the movable plate are provided with multiple matching second threaded holes, and a second threaded rod is screwed into the second threaded hole.
[0012] Furthermore, the first clamping component includes a second hydraulic cylinder and a second pressure plate. The bottom end of the second hydraulic cylinder is connected to the top surface of the movable plate, and the other end extends upward. The second pressure plate is connected to the end of the second hydraulic cylinder away from the movable plate, and the second pressure plate is arc-shaped.
[0013] Both second clamping components include a third hydraulic cylinder, a limiting block, and a movable block. One end of the third hydraulic cylinder is connected to one side of the limiting block, and the other end extends along the length of the movable plate. The limiting block is sleeved on the third hydraulic cylinder. The movable block is connected to the end of the third hydraulic cylinder away from the limiting block. A hinge is also connected between the movable block and the limiting block.
[0014] Furthermore, the hinge includes a fixed seat, a first pin, and two connecting plates. The fixed seat is installed on one side of the limiting block, and one end of each of the two connecting plates is installed on opposite sides of the fixed seat, while the other end is located on opposite sides of the movable block. The first pin passes through and rotates in engagement with the hinge.
[0015] Furthermore, the end of the third cylinder away from the movable plate is connected to a locking block, one end of which has a locking groove. The locking block is engaged in the locking groove and connected by a second pin.
[0016] Furthermore, a clamping assembly is provided on the top surface of the movable plate between the two second press-fitting assemblies. The clamping assembly is used to clamp and fix the shock absorber arm of the steering knuckle.
[0017] Furthermore, the clamping assembly includes a first support rod, a fourth hydraulic cylinder, and a third pressure plate. One end of the first support rod is connected to the top surface of the movable plate, and the other end extends upward and contacts the bottom surface of the shock absorber arm of the steering knuckle. The bottom end of the fourth hydraulic cylinder is connected to the bottom surface of the movable plate. The third pressure plate is installed at the end of the fourth hydraulic cylinder away from the movable plate, and both ends of the third pressure plate contact the top surfaces of the shock absorber arms of the two steering knuckles respectively.
[0018] The beneficial effects of this utility model are as follows:
[0019] This automotive parts positioning fixture allows operators to choose between simultaneously mounting two steering knuckles on the bottom surface of a movable plate and clamping them using a first pressing component, or simultaneously mounting two steering knuckles on the top surface of a movable plate and clamping them using a second pressing component, depending on processing needs. Furthermore, the two steering knuckles mounted on the top surface of the movable plate can be positioned at different angles, facilitating the processing of different parts of the steering knuckles and improving processing efficiency. Moreover, it eliminates the need for multiple pressing devices for separate clamping, thus effectively reducing production costs.
[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description
[0021] Figure 1 This is a perspective view (first view) of the present invention;
[0022] Figure 2 This is a perspective view (second view) of the present invention;
[0023] Figure 3 This is the front view of the present invention;
[0024] Figure 4 This is a partial structural diagram of the present invention without the steering knuckle installed (first-person perspective);
[0025] Figure 5 This is a partial structural diagram of the present invention without the steering knuckle installed (second view).
[0026] In the diagram: 1. Movable plate; 2. First pressing assembly; 21. Fixed plate; 22. First hydraulic cylinder; 23. First pressure plate; 24. Positioning assembly; 241. Positioning block; 242. Positioning rod; 243. First threaded hole; 244. First threaded rod; 25. First connecting hole; 3. Second pressing assembly; 31. Mounting plate; 32. First clamping component; 321. Second hydraulic cylinder; 322. Second pressure plate; 33. Second clamping component; 331. 1. Third hydraulic cylinder; 332. Limiting block; 333. Movable block; 4. Hinge; 41. Fixed seat; 42. First pin; 43. Connecting plate; 5. Locking block; 6. Locking groove; 7. Second pin; 8. Clamping assembly; 81. First support rod; 82. Fourth hydraulic cylinder; 83. Third pressure plate; 9. Second connecting hole; 10. First bearing seat; 11. Second bearing seat; 12. Third bearing seat; 13. Second support rod; 14. Third connecting hole. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0030] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. 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. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0031] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.
[0032] Please see Figure 1-5 This utility model provides a technical solution: an automotive parts positioning fixture, including a movable plate 1, a first pressing assembly 2 provided on the bottom surface of the movable plate 1, and two sets of second pressing assemblies 3 symmetrically distributed on the top surface of the movable plate 1;
[0033] The first pressing assembly 2 includes a fixed plate 21, a first hydraulic cylinder 22 and a first pressure plate 23. The fixed plate 21 is installed on the bottom surface of the movable plate 1. One end of the first hydraulic cylinder 22 is connected to the fixed plate 21 and the other end extends downward. The first pressure plate 23 is connected to the end of the first hydraulic cylinder 22 away from the fixed plate 21. The bottom surfaces of the movable plate 1 on both sides of the fixed plate 21 are equipped with a first bearing seat 10 and a positioning assembly 24. The positioning assembly 24 is used to position the steering knuckle during installation.
[0034] The second press-fitting assembly 3 includes a first clamping component 32 and two second clamping components 33, which are used to clamp and fix the two steering knuckles at different angles.
[0035] In this technical solution, the second press-fitting assembly 3 also includes a mounting plate 31. One end of the mounting plate 31 is connected to the top surface of the movable plate 1, and the other end extends upward and from the front to the rear side of the movable plate 1. The mounting plate 31 has a second connecting hole 9 adapted to the shock absorber arm of the steering knuckle. The first clamping component 32 is installed on the top surface of the movable plate 1, and two second clamping components 33 are installed on one side of the mounting plate 31. A second bearing seat 11 is installed on the top surface of the movable plate 1 on one side of the first clamping component 32, and a first limiting post is installed on the top surface of the movable plate 1 on one side of the second bearing seat 11. A third bearing seat 12 is provided on the mounting plate 31, and a third bearing seat 12 is installed on the mounting plate 31 on one side of the third bearing seat 12. The first bearing seat 10, the second bearing seat 11, and their respective opposing movable plates 1 are each provided with a matching first through hole. The third bearing seat 12 and the mounting plate 31 are each provided with a matching second through hole. The movable plate 1 is also provided with a third connecting hole 14 that matches the shock absorber arm of the steering knuckle. Each second press-fit assembly 3 is equipped with two steering knuckles at the same time, and the two steering knuckles are placed at different angles. One steering knuckle is installed on the vertical mounting plate 31, and the shock absorber arm of the steering knuckle passes through the third connecting hole 14. The other steering knuckle is installed on the planar movable plate 1, and the shock absorber arm of the steering knuckle passes through the second connecting hole 9.
[0036] In use, depending on the angle of the part of the steering knuckle that needs to be processed, the steering knuckle can be installed on the bottom surface of the movable plate 1 and clamped and fixed by the first pressing component 2, or it can be installed on the top surface of the movable plate 1 and clamped and fixed by the second pressing component 3. When the steering knuckle is installed on the bottom surface of the movable plate 1, the mounting surfaces of the two steering knuckles need to be precisely aligned with the two bearing seats on the movable plate 1 to ensure that the clearance between them meets the specified standard. At the same time, during this process, one kingpin hole on the steering knuckle also needs to be aligned with the positioning component to expose the part of the steering knuckle that needs to be processed. Then, the first hydraulic cylinder 22 is activated, and the first hydraulic cylinder 22 drives the first pressure plate 23 to gradually move closer along the direction of the movable plate 1 until its opposite ends contact the two steering knuckles respectively. During this process, the bearing seats and the pressure plate work together to clamp and fix the steering knuckle, ensuring that the steering knuckle remains stable during processing.
[0037] When installing the steering knuckles on the top surface of the movable plate 1, firstly, the shock absorber arm of one steering knuckle must be passed through the second connecting hole 9, ensuring that the mounting surface of the steering knuckle corresponds to the third bearing housing 12. Simultaneously, the kingpin hole of the steering knuckle is aligned and fitted onto the second limiting post. Next, the shock absorber arm of the other steering knuckle is passed through the third connecting hole 14, again ensuring that the mounting surface of the steering knuckle corresponds to the second bearing housing 11, and the kingpin hole of the steering knuckle is fitted onto the first limiting post. Then, the two pressing components are activated simultaneously. These two pressing components work together, applying pressure to both steering knuckles to achieve press-fit fixation. This operation method allows two steering knuckles to be processed and fixed simultaneously, improving work efficiency.
[0038] According to processing needs, the operator can choose to install two steering knuckles on the bottom surface of the movable plate 1 at the same time and clamp them with the first pressing component 2, or install two steering knuckles on the top surface of the movable plate 1 at the same time and clamp them with the second pressing component 3. The two steering knuckles installed on the top surface of the movable plate 1 are placed at different angles, which facilitates the processing of different parts of the steering knuckles, improves processing efficiency, and eliminates the need to use multiple pressing devices for clamping, thereby effectively reducing production costs.
[0039] In this embodiment, the positioning component includes a positioning block 241 and a positioning rod 242. The positioning block 241 is detachably installed on the top surface of the movable plate 1. One end of the positioning rod 242 is connected to the top surface of the positioning block 241, and the other end extends upward. Both the positioning block 241 and the movable plate 1 are provided with a plurality of matching first threaded holes 243. A first threaded rod 244 is screwed into the first threaded hole 243.
[0040] When installing the steering knuckle on the bottom surface of the movable plate 1, one of the kingpin holes on the steering knuckle is fitted onto the positioning rod 242. This prevents the steering knuckle from shaking during processing, which could cause deviations in positioning accuracy. Furthermore, since the required machining areas differ depending on the type of steering knuckle, the positioning block 241 and positioning rod 242 can be easily removed from the movable plate 1 using the convenience of the first threaded rod 244. This allows operators to flexibly replace positioning blocks 241 and positioning rods 242 of different heights according to processing needs, ensuring they can adapt to and meet the machining requirements of various steering knuckle models.
[0041] In this embodiment: a first connecting hole 25 is provided on the movable plate 1, the first connecting hole 25 extends longitudinally through the movable plate 1, the first oil cylinder 22 is slidably fitted in the connecting hole, and multiple matching second threaded holes are provided on both the fixed plate 21 and the movable plate 1, and a second threaded rod is screwed into the second threaded hole.
[0042] When the first cylinder 22 malfunctions, the second threaded rod can be used to quickly remove the first cylinder 22 from the movable plate 1 for necessary maintenance or to install a new cylinder for replacement.
[0043] In this embodiment: the first clamping component 32 includes a second hydraulic cylinder 321 and a second pressure plate 322. The bottom end of the second hydraulic cylinder 321 is connected to the top surface of the movable plate 1, and the other end extends upward. The second pressure plate 322 is connected to the end of the second hydraulic cylinder 321 away from the movable plate 1. The second pressure plate 322 is arc-shaped.
[0044] Both second clamping components 33 include a third hydraulic cylinder 331, a limiting block 332, and a movable block 333. One end of the third hydraulic cylinder 331 is connected to one side of the limiting block 332, and the other end extends along the length of the movable plate 1. The limiting block 332 is sleeved on the third hydraulic cylinder 331. The movable block 333 is connected to the end of the third hydraulic cylinder 331 away from the limiting block 332. A hinge 4 is also connected between the movable block 333 and the limiting block 332.
[0045] In this technical solution, the first oil cylinder 22, the second oil cylinder 321 and the third oil cylinder 331 all consist of a cylinder barrel and a piston rod.
[0046] After both steering knuckles are simultaneously installed on the top surface of the movable plate 1, the two third hydraulic cylinders 331 are activated simultaneously. The third hydraulic cylinders 331 retract, causing the movable block 333 to move synchronously. A hinge 4 connects the movable block 333 and the limiting block 332. When pushed by the piston rod, the movable block 333 can swing or fine-tune relative to the limiting block 332 in a controlled manner to adapt to different shapes and positions during the pressing process. Simultaneously, the hinge 4 provides additional stability and support, ensuring the smooth progress of the pressing process. During the pressing process, as the piston rod continues to extend, the movable block 333 gradually approaches and contacts the two steering knuckles to be pressed, thus pressing and fixing the two steering knuckles. Subsequently, the second hydraulic cylinder 321 is activated, causing it to retract and move the second pressure plate 322 synchronously until the end of the second pressure plate 322 away from the third hydraulic cylinder 331 contacts the top surface of the shock absorber arm of one of the steering knuckles, thereby clamping and fixing the steering knuckle shock absorber arm.
[0047] In this embodiment, the hinge 4 includes a fixed base 41, a first pin 42 and two connecting plates 43. The fixed base 41 is installed on one side of the limiting block 332. One end of the two connecting plates 43 is installed on opposite sides of the fixed base 41, and the other end is located on opposite sides of the movable block 333. The first pin 42 passes through and rotates in cooperation with the hinge.
[0048] The fixed seat 41 is installed on one side of the limiting block 332 as the supporting base of the hinge 4. One end of the two connecting plates 43 is installed on the opposite sides of the fixed seat 41, and the other end is located on the opposite sides of the movable block 333. The first pin 42 passes through the two connecting plates 43 and the movable block 333 and forms a rotational engagement with them, so that the movable block 333 can swing or finely adjust relative to the limiting block 332 within a certain range, thereby achieving contact and clamping with the steering knuckle.
[0049] In this embodiment: the end of the third oil cylinder 331 away from the movable plate 1 is connected to a locking block 5. One end of the movable block 333 is provided with a locking groove 6. The locking block 5 is locked in the locking groove 6 and connected by the second pin 7.
[0050] When the third cylinder 331 reciprocates, it drives the movable block 333 to rotate on the hinge 4 through the locking block 5, so that the movable block 333 can swing or finely adjust relative to the limit block 332 within a certain range.
[0051] In this embodiment, a clamping assembly 8 is provided on the top surface of the movable plate 1 between the two second pressing assemblies 3. The clamping assembly 8 is used to clamp and fix the shock absorber arm of the steering knuckle.
[0052] After both second press-fitting assemblies 3 have installed the steering knuckles, the shock absorber arms on each of the two steering knuckles will pass through the second connecting hole 9 from one side of the mounting plate 31 to the other side. At this time, the clamping assembly 8 can be used to clamp and fix the two shock absorber arms to ensure improved accuracy during the processing.
[0053] In this embodiment, the clamping assembly 8 includes a first support rod 81, a fourth hydraulic cylinder 82, and a third pressure plate 83. One end of the first support rod 81 is connected to the top surface of the movable plate 1, and the other end extends upward and contacts the bottom surface of the shock absorber arm of the steering knuckle. The bottom end of the fourth hydraulic cylinder 82 is connected to the bottom surface of the movable plate 1. The third pressure plate 83 is installed at the end of the fourth hydraulic cylinder 82 away from the movable plate 1, and both ends of the third pressure plate 83 contact the top surfaces of the shock absorber arms of the two steering knuckles respectively.
[0054] When the shock absorber arm of the steering knuckle extends through the first connecting hole 25 to the other side of the mounting plate 31, the bottom surface of the shock absorber arm contacts the first support rod 81. Then, the second hydraulic cylinder 321 is activated, causing the second hydraulic cylinder 321 to change from its original extended state to its retracted state. During the retraction of the second hydraulic cylinder 321, the third pressure plate 83 is driven to move downward until both ends of the third pressure plate 83 contact the top surfaces of the shock absorber arms of the two steering knuckles, thereby achieving the clamping and fixing of the shock absorber arms of the steering knuckle.
[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. An automotive parts positioning fixture jig comprising a movable plate (1) characterised in that: The bottom surface of the movable plate (1) is provided with a first pressing assembly (2), and the top surface of the movable plate (1) is provided with two sets of second pressing assemblies (3) that are symmetrically distributed. The first pressing assembly (2) includes a fixed plate (21), a first hydraulic cylinder (22) and a first pressure plate (23). The fixed plate (21) is installed on the bottom surface of the movable plate (1). One end of the first hydraulic cylinder (22) is connected to the fixed plate (21), and the other end extends downward. The first pressure plate (23) is connected to the end of the first hydraulic cylinder (22) away from the fixed plate (21). The bottom surfaces of the movable plate (1) on both sides of the fixed plate (21) are equipped with a first bearing seat (10) and a positioning assembly (24). The positioning assembly (24) is used to position the steering knuckle during installation. The second press-fit assembly (3) includes a first clamping component (32) and two second clamping components (33), which are used to clamp and fix the two steering knuckles at different angles.
2. The fixture of claim 1, wherein: The positioning component includes a positioning block (241) and a positioning rod (242). The positioning block (241) is detachably installed on the top surface of the movable plate (1). One end of the positioning rod (242) is connected to the top surface of the positioning block (241), and the other end extends upward. Both the positioning block (241) and the movable plate (1) are provided with a plurality of matching first threaded holes (243). A first threaded rod (244) is screwed into the first threaded hole (243).
3. The fixture of claim 2, wherein: The movable plate (1) is provided with a first connecting hole (25), which extends longitudinally through the movable plate (1). The first oil cylinder (22) is slidably fitted in the connecting hole. The fixed plate (21) and the movable plate (1) are each provided with a plurality of matching second threaded holes, and a second threaded rod is screwed into the second threaded hole.
4. The fixture of claim 1 wherein: The first clamping component (32) includes a second hydraulic cylinder (321) and a second pressure plate (322). The bottom end of the second hydraulic cylinder (321) is connected to the top surface of the movable plate (1), and the other end extends upward. The second pressure plate (322) is connected to the end of the second hydraulic cylinder (321) away from the movable plate (1). The second pressure plate (322) is arc-shaped. Both of the second clamping components (33) include a third hydraulic cylinder (331), a limiting block (332), and a movable block (333). One end of the third hydraulic cylinder (331) is connected to one side of the limiting block (332), and the other end extends along the length of the movable plate (1). The limiting block (332) is sleeved on the third hydraulic cylinder (331). The movable block (333) is connected to the end of the third hydraulic cylinder (331) away from the limiting block (332). A hinge (4) is also connected between the movable block (333) and the limiting block (332).
5. The fixture of claim 4, wherein: The hinge (4) includes a fixed seat (41), a first pin (42) and two connecting plates (43). The fixed seat (41) is installed on one side of the limiting block (332). One end of each of the two connecting plates (43) is installed on opposite sides of the fixed seat (41), and the other end is located on opposite sides of the movable block (333). The first pin (42) passes through and rotates in cooperation with the hinge.
6. The fixture of claim 5 wherein: The third oil cylinder (331) is connected to a locking block (5) at one end away from the movable plate (1). One end of the movable block (333) has a locking groove (6). The locking block (5) is engaged in the locking groove (6) and is connected by a second pin (7).
7. The fixture of claim 1 wherein: A clamping assembly (8) is provided on the top surface of the movable plate (1) between the two second press-fitting assemblies (3), the clamping assembly (8) being used to clamp and fix the shock absorber arm of the steering knuckle.
8. The fixture of claim 7, wherein: The clamping assembly (8) includes a first support rod (81), a fourth hydraulic cylinder (82), and a third pressure plate (83). One end of the first support rod (81) is connected to the top surface of the movable plate (1), and the other end extends upward and contacts the bottom surface of the shock absorber arm of the steering knuckle. The bottom end of the fourth hydraulic cylinder (82) is connected to the bottom surface of the movable plate (1). The third pressure plate (83) is installed at the end of the fourth hydraulic cylinder (82) away from the movable plate (1), and both ends of the third pressure plate (83) contact the top surfaces of the shock absorber arms of the two steering knuckles respectively.