A chassis strength testing fixture

Abstract

This invention discloses a chassis strength testing fixture, relating to the field of chassis testing technology. It includes a fixing mechanism and a test chassis. The fixing mechanism includes a protective shell, inside which a pressure testing mechanism is installed. The pressure testing mechanism includes a hydraulic cylinder, the top of which is fixedly connected to the inner top wall of the protective shell. This invention sets up a pressure testing mechanism above the test chassis. The hydraulic cylinder drives a pressing plate downwards to compress the test chassis to test its strength. Positioning mechanisms are set at the four corners of the pressing plate, clamping and fixing the crossbeams of the test chassis. A sliding block drives a U-shaped rod to move, which in turn adjusts the position of the positioning mechanism. This allows the positioning mechanisms on both sides to be adjusted according to the distance between the crossbeams of the test chassis, facilitating changes in the pressing area of ​​the pressing plate on the chassis. This allows for simulating the support effect of heavy objects with different bottom areas on the test chassis, thus improving the testing range of the chassis.

Description

Technical Field

[0001] This invention relates to the field of vehicle frame testing technology, specifically to a vehicle frame strength testing fixture. Background Technology

[0002] The chassis is a frame structure that spans the front and rear axles of a car, commonly known as the main beam. It is the base of the car and is like the skeleton of a person, supporting the car body. Therefore, the strength of a car's chassis also affects the safety performance of the car while driving. So, during the production process, the chassis needs to undergo external strength testing to simulate the chassis's protective effect against different external forces.

[0003] In existing technologies, such as the Chinese patent application CN112708835A entitled "A process for reducing thermal shock deformation of aluminum alloy subframe products," the deformation of subframe products during heat treatment is reduced through heat treatment processes, heat treatment tooling, and placement methods. Finally, the deformed products are corrected using straightening tooling. This device greatly improves the design flexibility of subframe products and can reduce deformation caused by thermal shock while ensuring product strength. Finally, the deformed parts are corrected using straightening tooling.

[0004] However, in existing technologies, the deformation of a typical bicycle frame is detected by applying external force. Since the frame has a hollow design, the crossbeams and longitudinal beams of the frame need to be fixed during the frame testing process. However, the fixed position of the frame beams in a typical bicycle frame remains unchanged, which results in the pressure test area of ​​the frame always being within a certain range. This makes it impossible to test the pressure of heavy objects with different bottom areas on the frame, thus affecting the test results. Summary of the Invention

[0005] The purpose of this invention is to provide a frame strength testing fixture to solve the problem mentioned in the background art, which states that the general frame testing method detects the degree of deformation of the frame by applying external force. However, since the frame adopts a hollow design, the crossbeams and longitudinal beams of the frame need to be fixed during the frame testing process. However, the fixed position of the frame beams in a general frame remains unchanged, which results in the pressure test area of ​​the frame always being within a certain range. This makes it impossible to test the pressure of heavy objects with different bottom areas on the frame, thus affecting the test results.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a chassis strength testing fixture, comprising a fixing mechanism and a test chassis, wherein the fixing mechanism includes a protective shell, and a pressure testing mechanism is provided inside the protective shell, the pressure testing mechanism includes a hydraulic cylinder, the top end of the hydraulic cylinder is fixedly connected to the inner top wall of the protective shell, a pressing plate is fixedly connected to the output end of the hydraulic cylinder, two positioning slide rails are fixedly connected to the bottom end of the pressing plate, sliding blocks are slidably connected to the inner side walls of the two positioning slide rails, a U-shaped rod is fixedly connected between the two sliding blocks, and a positioning mechanism is provided on the outer side wall of the U-shaped rod;

[0007] The positioning mechanism includes a sliding component, a clamping component, and a fixing component. The sliding component includes a connecting seat, with two connecting plates fixedly connected to the bottom end of the connecting seat. A lifting seat is fixedly connected to the bottom end of the connecting plate, and a rotating cylinder is rotatably connected to the top end of the lifting seat. The inner side wall of the rotating cylinder is slidably connected to the outer side wall of the U-shaped rod, and the outer side wall of the rotating cylinder is rotatably connected to the connecting plate. The clamping component includes two clamping arms, with the top ends of both clamping arms rotatably connected to the outer side wall of the rotating cylinder.

[0008] Preferably, a rotating shaft is fixedly connected to the outer wall of the clamping arm, and a positioning threaded seat is rotatably connected to the outer wall of the rotating shaft. The clamping arms are all internally hollow clamping plates. The rotating shaft rotates between the hollow side walls of the clamping arms. By setting the positioning threaded seat on the rotating shaft, the rotation angle of the clamping arms on both sides can be adjusted.

[0009] Preferably, the fixing component includes a rotating seat, one side of which is fixedly connected to a positive threaded screw. The positive threaded screw is set on the horizontal line of the two clamping arms. When the positive threaded screw is rotated, it drives a positioning threaded seat to move away from the lifting seat, thereby changing the angle between the clamping arms and the lifting seat, which facilitates adjusting the angle of the two clamping arms to fix the inspection frame.

[0010] Preferably, a reverse threaded screw is fixedly connected to the end of the positive threaded screw away from the rotating seat. Both the reverse threaded screw and the positive threaded screw are threadedly connected to the positioning threaded seats at corresponding positions. When the positive threaded screw rotates, the reverse threaded screw also rotates with the positive threaded screw. The direction of the external thread on the reverse threaded screw is opposite to that on the positive threaded screw, thereby causing the reverse threaded screw to drive the positioning threaded seat on the other side to move away from the lifting seat. While one rotating seat rotates, the two clamping arms simultaneously clamp inward or unfold outward, thus achieving the fixation between the crossbeams of the inspection frame.

[0011] Preferably, a rocker arm is fixedly embedded in the side wall of the rotating seat, and a rubber sleeve is fixedly connected to the outer side wall of the rocker arm. By using the rocker arm on the outer side wall of the rotating seat, the rotating seat can be rotated, and the clamping arm can be quickly adjusted, which facilitates the clamping assembly to quickly clamp the inspection frame.

[0012] Preferably, the bottom end of the clamping arm is fixedly connected to an anti-slip rubber pad, and the two clamping arms are movably connected to the testing frame through the anti-slip rubber pad. The anti-slip rubber pad fixed on the outer wall of the clamping arm increases the friction between the testing frame and the anti-slip rubber pad, making it easier to fix the testing frame.

[0013] Preferably, support columns are fixedly connected to the four corners of the bottom surface of the protective shell, and a base plate is fixedly connected to the bottom end of the support columns. By setting a base plate at the bottom end of the protective shell, the protective shell is prevented from being directly squeezed between itself and the ground when the hydraulic cylinder presses downward.

[0014] Preferably, four casters are fixedly connected to the four corners of the bottom surface of the base plate, and a limit rod is fixedly connected to the side wall of the U-shaped rod. By setting four casters on the bottom surface of the base plate, the protective shell can be moved quickly and its position can be adjusted.

[0015] Preferably, the side wall of the connecting seat is provided with a sliding hole, and the outer side wall of the limiting rod is slidably connected to the inner side wall of the sliding hole. By setting the connecting seat at the top of the positioning mechanism, and through the sliding hole in the middle of the connecting seat and the limiting rod, the positioning mechanism is fixed for a second time, avoiding the problem of the positioning mechanism rotating around the U-shaped rod by the rotating cylinder causing the detection frame to be fixed and stable.

[0016] Preferably, the outer walls of both the positive threaded screw and the negative threaded screw are fixedly connected to limit rings, and the inner wall of the lifting seat is provided with a lifting groove. The limit ring is slidably connected to the inner wall of the lifting groove. By sliding the limit ring on the lifting seat, the limit ring drives the positive threaded screw or the negative threaded screw to slide at a certain height, so that the positive threaded screw moves by moving the corresponding positioning thread seat.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In this invention, a pressure testing mechanism is set above the test frame. A hydraulic cylinder drives a pressing plate downward to compress the test frame to test its strength. A positioning mechanism is set at the four corners of the pressing plate. The positioning mechanism clamps and fixes the crossbeams of the test frame. At the same time, two sliding blocks slide on the positioning slide rail. The sliding blocks drive the U-shaped rod to move. The U-shaped rod drives the positioning mechanism to adjust its position. This allows the positioning mechanisms on both sides to be adjusted according to the distance between the crossbeams of the test frame. This facilitates the adjustment of the pressing area of ​​the pressing plate on the frame, and makes it easier to simulate the support effect of heavy objects with different bottom areas on the test frame, thereby improving the test range of the test frame.

[0019] 2. In this invention, a rotating seat is provided on the outside of the two clamping arms. The rotating seat fixes the positive threaded screw and the negative threaded screw connected at both ends. Rotating the rotating seat causes the positive threaded screw and the negative threaded screw to rotate, so that the clamping arms on both sides can be extended outward or clamped inward respectively through the positioning threaded seat, thereby achieving the effect of quickly clamping the inspection frame.

[0020] 3. In this invention, a U-shaped rod is set at the bottom of the sliding block, allowing the rotating cylinder to slide on the U-shaped rod, thus achieving a preliminary limiting effect on the positioning mechanism. This allows the positioning mechanism to slide on the U-shaped rod. By fixing a limiting rod to the U-shaped rod, a limiting effect on the vertical positioning mechanism is achieved, improving the stability of the positioning mechanism sliding on the U-shaped rod. This prevents the positioning mechanism from sliding between itself and the pressing plate, thereby improving the accuracy of the data from the hydraulic cylinder test of the chassis. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a chassis strength testing fixture according to the present invention;

[0022] Figure 2 This is a bottom view of a chassis strength testing fixture according to the present invention;

[0023] Figure 3 This is a schematic diagram of the pressure testing mechanism of a chassis strength testing fixture according to the present invention;

[0024] Figure 4 This is a schematic diagram of the bottom structure of the pressing plate of a frame strength testing fixture according to the present invention;

[0025] Figure 5 This is a schematic diagram of the positioning mechanism structure of a frame strength testing fixture according to the present invention;

[0026] Figure 6 This is a side sectional view of the positioning mechanism of a frame strength testing fixture according to the present invention;

[0027] Figure 7 This is a half-sectional schematic diagram of the positive thread screw and the negative thread screw of the frame strength testing fixture of the present invention.

[0028] In the picture:

[0029] 1. Fixing mechanism; 11. Base plate; 12. Casters; 13. Support column; 14. Protective shell; 2. Inspection vehicle frame;

[0030] 3. Pressure testing mechanism; 31. Hydraulic cylinder; 32. Pressing plate; 33. Positioning slide rail; 34. Sliding block; 35. U-shaped rod; 36. Limiting rod;

[0031] 4. Positioning mechanism; 41. Sliding assembly; 411. Connecting seat; 412. Connecting plate; 413. Rotating cylinder; 414. Lifting seat; 415. Limiting ring; 416. Sliding hole; 417. Lifting groove;

[0032] 42. Clamping assembly; 421. Clamping arm; 422. Anti-slip rubber pad; 423. Rotating shaft; 424. Positioning thread seat;

[0033] 43. Fixed component; 431. Rotating seat; 432. Rocker arm; 433. Positive threaded screw; 434. Negative threaded screw. Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0035] Reference Figure 1-7As shown: A frame strength testing fixture includes a fixing mechanism 1 and a test frame 2. The fixing mechanism 1 includes a protective shell 14, and a pressure testing mechanism 3 is arranged inside the protective shell 14. The pressure testing mechanism 3 includes a hydraulic cylinder 31. The top end of the hydraulic cylinder 31 is fixedly connected to the inner top wall of the protective shell 14. A pressing plate 32 is fixedly connected to the output end of the hydraulic cylinder 31. Two positioning slide rails 33 are fixedly connected to the bottom end of the pressing plate 32. Sliding blocks 34 are slidably connected to the inner side walls of the two positioning slide rails 33. A U-shaped rod 35 is fixedly connected between the two sliding blocks 34. A positioning mechanism 4 is arranged on the outer side wall of the U-shaped rod 35. The test frame 2 is placed above the inner bottom wall of the protective shell 14. The hydraulic cylinder 31 is activated, causing the hydraulic cylinder 31 to move the pressing plate 32 downward, so that the bottom end of the pressing plate 32 is suspended above the top of the test frame 2. The four positioning mechanisms 4 are fixedly connected to the bottom of the pressing plate 32 through the positioning slide rail 33, and they can be clamped and fixed to each other between the crossbeam of the test frame 2. After the pressing plate 32 is fixed to the test frame 2 through the four positioning mechanisms 4, the hydraulic cylinder 31 is activated to push downward, so that the pressing plate 32 generates downward pressure on the test frame 2. The strength test of the frame is achieved by detecting the degree of deformation of the test frame 2.

[0036] The positioning mechanism 4 includes a sliding assembly 41, a clamping assembly 42, and a fixing assembly 43. The sliding assembly 41 includes a connecting seat 411, with two connecting plates 412 fixedly connected to the bottom end of the connecting seat 411. A lifting seat 414 is fixedly connected to the bottom end of the connecting plate 412, and a rotating cylinder 413 is rotatably connected to the top end of the lifting seat 414. The inner wall of the rotating cylinder 413 is slidably connected to the outer wall of the U-shaped rod 35, and the outer wall of the rotating cylinder 413 is rotatably connected to the connecting plate 412. The clamping assembly 42 includes two clamping arms 421, with the top ends of both clamping arms 421 rotatably connected to the outer wall of the rotating cylinder 413. In use, when the distance between the two fixedly connected crossbeams of the detection frame 2 is different, a sliding block 34 is slidable inside the positioning slide rail 33. The positioning slide rail 33 is a groove with an inverted T-shaped structure inside, and the sliding block 34 is an inverted T-shaped slider. When the positioning slide rail 33 and the sliding block 34 slide together, the distance between them is... The distance between the two U-shaped rods 35 is changed by altering the distance of the sliding block 34 on the positioning slide rail 33. The two U-shaped rods 35 are fixed to the two crossbeams respectively. The clamping arm 421 is rotated around the rotating cylinder 413, thereby opening or closing the bottom ends of the two clamping arms 421. After opening the clamping arm 421, the outer walls of the crossbeams at the openings of the two clamping arms 421 are aligned, and then the two clamping arms 421 are closed, thereby achieving the connection effect of the test frame 2. By sliding the two rotating cylinders 413 on the U-shaped rod 35, one end of the U-shaped rod 35 passes through the two rotating cylinders 413 and the two connecting plates 412 in the middle, achieving the effect of adjusting the position of the two positioning mechanisms 4 on the same crossbeam. This distributes the pressing force of the four positioning mechanisms 4 on the pressing plate 32 to the four positions of the test frame 2, increasing the stability of the test frame 2 during strength testing. Example

[0037] like Figure 5 , Figure 6 and Figure 7 As shown, a rotating shaft 423 is fixedly connected to the outer wall of the clamping arm 421, and a positioning thread seat 424 is rotatably connected to the outer wall of the rotating shaft 423. The clamping arms 421 are all internally hollow clamping plates. The rotating shaft 423 rotates between the hollow side walls of the clamping arms 421. By setting the positioning thread seat 424 on the rotating shaft 423, the rotation angle of the clamping arms 421 on both sides can be adjusted.

[0038] In addition, the fixing component 43 includes a rotating seat 431, on one side of which a positive threaded screw 433 is fixedly connected. The positive threaded screw 433 is set on the horizontal line of the two clamping arms 421. When the positive threaded screw 433 is rotated, it drives a positioning threaded seat 424 to move away from the lifting seat 414, thereby changing the angle between the clamping arms 421 and the lifting seat 414, which makes it easier to adjust the angle of the two clamping arms 421 to fix the inspection frame 2.

[0039] Meanwhile, a reverse threaded screw 434 is fixedly connected to the end of the positive threaded screw 433 away from the rotating seat 431. Both the reverse threaded screw 434 and the positive threaded screw 433 are threadedly connected to the positioning threaded seat 424 at the corresponding positions. When the positive threaded screw 433 rotates, the reverse threaded screw 434 also rotates with the positive threaded screw 433. The direction of the external thread on the reverse threaded screw 434 is opposite to that on the positive threaded screw 433, so that the reverse threaded screw 434 drives the positioning threaded seat 424 on the other side to move away from the lifting seat 414. When one rotating seat 431 rotates, the two clamping arms 421 simultaneously clamp inward or unfold outward, thus achieving the fixation between the crossbeams of the inspection frame 2. Example

[0040] like Figure 2 and Figure 5 As shown, a rocker arm 432 is fixedly embedded in the side wall of the rotating seat 431, and a rubber sleeve is fixedly connected to the outer side wall of the rocker arm 432. By using the rocker arm 432 on the outer side wall of the rotating seat 431, the rotating seat 431 can be rotated, which enables the quick adjustment of the clamping arm 421 and facilitates the quick clamping of the inspection frame 2 by the clamping assembly 42.

[0041] In addition, an anti-slip rubber pad 422 is fixedly connected to the bottom end of the clamping arm 421. The two clamping arms 421 are movably connected to the inspection vehicle frame 2 through the anti-slip rubber pad 422. The anti-slip rubber pad 422 fixed to the outer wall of the clamping arm 421 increases the friction between the inspection vehicle frame 2 and the anti-slip rubber pad 422, making it easier to fix the inspection vehicle frame 2.

[0042] Meanwhile, support columns 13 are fixedly connected to the four corners of the bottom surface of the protective shell 14, and a base plate 11 is fixedly connected to the bottom end of the support column 13. By setting the base plate 11 at the bottom end of the protective shell 14, the protective shell 14 is prevented from being squeezed directly between itself and the ground when the hydraulic cylinder 31 presses downward. Example

[0043] like Figure 2 and Figure 7As shown, casters 12 are fixedly connected to the four corners of the bottom surface of the base plate 11, and limit rods 36 are fixedly connected to the side wall of the U-shaped rod 35. By setting four casters 12 on the bottom surface of the base plate 11, the protective shell 14 can be moved quickly and the position of the protective shell 14 can be adjusted.

[0044] In addition, the side wall of the connecting seat 411 is provided with a sliding hole 416. The outer side wall of the limiting rod 36 is slidably connected to the inner side wall of the sliding hole 416. By setting the connecting seat 411 at the top of the positioning mechanism 4, and passing through the sliding hole 416 in the middle of the connecting seat 411 and the limiting rod 36, the positioning mechanism 4 is fixed for a second time. This avoids the problem of the positioning mechanism 4 rotating around the U-shaped rod 35 by the rotating cylinder 413, which would cause the detection frame 2 to be fixed and stable.

[0045] Meanwhile, limit rings 415 are fixedly connected to the outer walls of both the positive thread screw 433 and the negative thread screw 434. A lifting groove 417 is provided on the inner wall of the lifting seat 414. The limit ring 415 is slidably connected to the inner wall of the lifting groove 417. When the clamping arm 421 extends outward, it tilts outward, causing the position of the fixed positioning thread seat 424 on the clamping arm 421 to tilt outward. The positioning thread seat 424 rotates around the rotating shaft 423, causing the positioning screw... The side wall of the threaded seat 424 is always parallel to the lifting seat 414, which facilitates the fixing component 43 and the reverse threaded screw 434 to pass through the two clamping arms 421. At the same time, since the vertical height of the positioning threaded seat 424 is raised accordingly when it is unfolded, by sliding the limiting ring 415 on the lifting seat 414, the limiting ring 415 drives the positive threaded screw 433 or the reverse threaded screw 434 to slide at a height, so that the positive threaded screw 433 moves with the movement of the positioning threaded seat 424.

[0046] The usage method and working principle of this device are as follows: When in use, place the test frame 2 inside the protective shell 14, start the hydraulic cylinder 31, the hydraulic cylinder 31 drives the pressing plate 32 to move downward, rotate the rocker arm 432, so that the rocker arm 432 drives the rotating seat 431 to rotate, so that the rotating seat 431 drives the positive thread screw 433 and the negative thread screw 434 to rotate, so that the positive thread screw 433 and the negative thread screw 434 both extend the clamping arms 421 on both sides outward through the positioning thread seat 424, aligning the two clamping arms 421 with the crossbeam of the test frame 2;

[0047] After fixing the clamping arm 421 on one side of the U-shaped rod 35 to a crossbeam of the inspection vehicle frame 2, slide another sliding block 34 on the positioning slide rail 33 to fix the clamping arm 421 on the other side of the U-shaped rod 35 to the crossbeam of the inspection vehicle frame 2. Rotate the rotating seat 431 in the opposite direction to make the rotating seat 431 drive the positive thread screw 433 and the negative thread screw 434 to reverse, so that the two clamping arms 421 clamp and fix the inspection vehicle frame 2.

[0048] By sliding the rotating cylinder 413 on the U-shaped rod 35, the rotating cylinder 413 drives the clamping arm 421 to move, thereby moving the positioning mechanism 4 on the U-shaped rod 35. This changes the fixed position of the four clamping arms 421 on the test frame 2, thereby adjusting the pressure test area of ​​the pressing plate 32 on the test frame 2, and achieving pressure test effects on different areas of the test frame 2.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A frame strength testing fixture, comprising a fixing mechanism (1) and a test frame (2), characterized in that: The fixing mechanism (1) includes a protective shell (14), and a pressure testing mechanism (3) is provided inside the protective shell (14). The pressure testing mechanism (3) includes a hydraulic cylinder (31). The top end of the hydraulic cylinder (31) is fixedly connected to the inner top wall of the protective shell (14). A pressing plate (32) is fixedly connected to the output end of the hydraulic cylinder (31). Two positioning slide rails (33) are fixedly connected to the bottom end of the pressing plate (32). Sliding blocks (34) are slidably connected to the inner side walls of the two positioning slide rails (33). A U-shaped rod (35) is fixedly connected between the two sliding blocks (34). A positioning mechanism (4) is provided on the outer side wall of the U-shaped rod (35). The positioning mechanism (4) includes a sliding component (41), a clamping component (42), and a fixing component (43). The sliding component (41) includes a connecting seat (411). Two connecting plates (412) are fixedly connected to the bottom end of the connecting seat (411). A lifting seat (414) is fixedly connected to the bottom end of the connecting plate (412). A rotating cylinder (413) is rotatably connected to the top end of the lifting seat (414). The inner side wall of the rotating cylinder (413) is slidably connected to the outer side wall of the U-shaped rod (35). The outer side wall of the rotating cylinder (413) is rotatably connected to the connecting plate (412). The clamping component (42) includes two clamping arms (421). The top ends of the two clamping arms (421) are rotatably connected to the outer side wall of the rotating cylinder (413).

2. The chassis strength testing fixture according to claim 1, characterized in that: The outer side wall of the clamping arm (421) is fixedly connected to a rotating shaft (423), and the outer side wall of the rotating shaft (423) is rotatably connected to a positioning threaded seat (424).

3. The chassis strength testing fixture according to claim 1, characterized in that: The fixing component (43) includes a rotating seat (431), and a positive thread screw (433) is fixedly connected to one side of the rotating seat (431).

4. The chassis strength testing fixture according to claim 3, characterized in that: The positive threaded screw (433) is fixedly connected to a negative threaded screw (434) at the end opposite to the rotating seat (431). Both the negative threaded screw (434) and the positive threaded screw (433) are threadedly connected to the positioning threaded seat (424) at the corresponding position.

5. The chassis strength testing fixture according to claim 3, characterized in that: A rocker arm (432) is fixedly embedded in the side wall of the rotating seat (431), and a rubber sleeve is fixedly connected to the outer side wall of the rocker arm (432).

6. The chassis strength testing fixture according to claim 1, characterized in that: The bottom end of the clamping arm (421) is fixedly connected to an anti-slip rubber pad (422), and the two clamping arms (421) are movably connected to the detection frame (2) through the anti-slip rubber pad (422).

7. The chassis strength testing fixture according to claim 1, characterized in that: The protective shell (14) has a support column (13) fixedly connected at each of the four corners of its bottom surface, and a base plate (11) is fixedly connected to the bottom end of the support column (13).

8. The chassis strength testing fixture according to claim 7, characterized in that: The bottom plate (11) is fixedly connected to four corners of the bottom surface with casters (12), and the side wall of the U-shaped rod (35) is fixedly connected to a limit rod (36).

9. The chassis strength testing fixture according to claim 8, characterized in that: The side wall of the connecting seat (411) is provided with a sliding hole (416), and the outer side wall of the limiting rod (36) is slidably connected to the inner side wall of the sliding hole (416).

10. The chassis strength testing fixture according to claim 4, characterized in that: The outer walls of the positive thread screw (433) and the negative thread screw (434) are fixedly connected with limit rings (415), and the inner wall of the lifting seat (414) is provided with a lifting groove (417). The limit ring (415) is slidably connected to the inner wall of the lifting groove (417).

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