A tractor frame bending test bench

Abstract

This utility model relates to a tractor frame bending test bench, belonging to the field of vehicle component testing. The technical solution is as follows: a tractor frame bending test bench includes a front suspension simulation device and a rear suspension simulation device. The front suspension simulation device includes a front axle simulated crossbeam and two front leaf spring simulated longitudinal beams. The two front leaf spring simulated longitudinal beams are perpendicularly connected to the lower flange of the front axle simulated crossbeam. Loading mechanisms are provided at both ends of the upper flange of the front axle simulated crossbeam, and frame connection structures are provided at both ends of the upper flange of the front leaf spring simulated longitudinal beams. The rear suspension simulation device includes two rear leaf spring simulated longitudinal beams and two saddle-mounted fixed longitudinal beams. Six-component force sensors are jointly installed on the two saddle-mounted fixed longitudinal beams. This test bench can accurately replicate the mechanical transmission path of the actual vehicle's front suspension, ensuring that the load applied by the loading mechanism is transmitted to the frame along the actual suspension force direction, thus improving the consistency between the frame stress state during testing and the actual vehicle operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of vehicle component testing, and in particular to a tractor frame bending test bench. Background Technology

[0002] In the design and manufacture of medium and heavy-duty tractor units, the chassis, as a critical load-bearing structural component, directly affects the vehicle's safety, reliability, and service life during operation due to its bending fatigue durability. Therefore, bending fatigue durability tests are necessary for tractor chassis to evaluate their performance and provide a basis for chassis design and optimization.

[0003] Existing tractor frame bending test devices mostly use a method of loading only at the saddle. Specifically, the two ends of the frame are rigidly supported, and a static or quasi-static concentrated load is applied vertically using loading equipment such as hydraulic cylinders or servo actuators directly above (or below) the saddle's designed installation area. The core is to simulate the vertical force borne by the saddle when the vehicle is fully loaded.

[0004] However, the current scheme only considers the impact of vehicle load on frame bending, ignoring dynamic factors such as road surface undulations and bumps during actual driving. It is difficult to fully simulate the complex and variable bending load of the frame caused by road surface undulations during actual driving, resulting in a large deviation between the test results and the actual stress conditions, and failing to provide an accurate basis for frame design and optimization. Summary of the Invention

[0005] This invention addresses the problem that current vehicle frame bending test devices apply loads at the saddle, failing to simulate dynamic factors such as undulations and bumps in real road conditions, by providing a tractor frame bending test bench.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: a tractor frame bending test bench, including a front suspension simulation device and a rear suspension simulation device; the front suspension simulation device includes a front axle simulation crossbeam and two front leaf spring simulation longitudinal beams, the two front leaf spring simulation longitudinal beams are respectively vertically connected to the lower flange of the front axle simulation crossbeam, and loading mechanisms are respectively provided at both ends of the upper flange of the front axle simulation crossbeam, and frame connection structures are provided at both ends of the upper flange of the front leaf spring simulation longitudinal beam; the rear suspension simulation device includes two rear leaf spring simulation longitudinal beams and two saddle-mounted fixed longitudinal beams, and a six-component force sensor is jointly provided on the two saddle-mounted fixed longitudinal beams, the six-component force sensor is located above the rear leaf spring simulation longitudinal beam, and the rear leaf spring simulation longitudinal beam is used to support the balance shaft of the frame under test. The front suspension simulation device, through the vertical connection between the front axle simulated crossbeam and the front leaf spring simulated longitudinal beam, can accurately replicate the mechanical transmission path of the actual vehicle's front suspension. This ensures that the load applied by the loading mechanism is transmitted to the frame along the actual suspension's force direction, improving the consistency between the frame's stress state during testing and real-world vehicle conditions. The rear suspension simulation device, equipped with six force sensors, can monitor the three-dimensional force and torque components at the frame's balance shaft in real time, providing multi-dimensional load data for accurate analysis of the frame's performance under complex stress conditions. The rear leaf spring simulates the longitudinal beam's support method on the frame's balance shaft, strictly mirroring the actual vehicle structure and effectively simulating the rear suspension's support characteristics under load.

[0007] As a preferred embodiment of a tractor frame bending test bench, the front axle simulated crossbeam and the front leaf spring simulated longitudinal beam are connected by a shaft hinge. The shaft hinge is set longitudinally, and loading connection plates are respectively provided at both ends of the upper flange of the front axle simulated crossbeam. The loading mechanism is mounted on the loading connection plate via a ball joint. The longitudinal shaft design of the shaft hinge allows the front leaf spring simulated longitudinal beam to rotate relative to the front axle simulated crossbeam in the longitudinal plane, which can simulate the pitching motion of the front suspension of a real vehicle when the road surface is uneven. This allows the test to more comprehensively reproduce the bending deformation condition of the frame during dynamic driving. The loading mechanism is connected to the loading connection plate via a ball joint, giving it multi-degree-of-freedom adjustment capability in the loading direction. It can adapt to the complex load direction requirements under different test conditions, ensuring that the loading force can be accurately applied to the target position, and improving the flexibility and accuracy of the test loading.

[0008] As a preferred embodiment of a tractor frame bending test bench, the loading connecting plate has a first elongated hole arranged laterally. The loading connecting plate is connected to the front axle simulated crossbeam by a first bolt passing through the first elongated hole. The laterally arranged first elongated hole allows the loading connecting plate to be adjusted in position along the lateral direction of the front axle simulated crossbeam. By adjusting the lateral position of the loading mechanism, it can adapt to the front suspension structure of different wheelbase vehicle models, significantly expanding the range of applicable vehicle models for the test bench and improving the versatility of the equipment.

[0009] As a preferred embodiment of a tractor frame bending test bench, the loading mechanism is a hydraulic cylinder. Hydraulic cylinders feature fast response, stable and precisely controllable output force, and can adjust the magnitude and frequency of the loading force in real time according to test requirements. This accurately simulates the dynamic changes in road load during actual vehicle operation, providing stable and controllable loading conditions for frame bending fatigue testing and ensuring the reliability of test data.

[0010] As a preferred embodiment of a tractor frame bending test bench, the rear suspension simulation device further includes four reaction frames arranged in a rectangular pattern. Both ends of the saddle-mounted fixed longitudinal beam and both ends of the rear leaf spring simulated longitudinal beam are respectively fixedly mounted on two of the reaction frames. This rectangular arrangement of the four reaction frames provides a stable support frame for the rear suspension simulation device, effectively bearing the complex loads transmitted by the frame during the test and ensuring the overall stability of the test bench.

[0011] As a preferred embodiment of a tractor frame bending test bench, a rear leaf spring beam support and a saddle beam support are installed on the side of the reaction frame. Both the rear leaf spring beam support and the saddle beam support are L-shaped. A second elongated hole is provided on the vertical panel of the rear leaf spring beam support and the saddle beam support. The second elongated hole is set in the vertical direction. Both the rear leaf spring beam support and the saddle beam support are connected to the reaction frame by a second bolt, which passes through the corresponding second elongated hole. The horizontal panel of the rear leaf spring beam support is fixedly connected to the lower flange of the rear leaf spring simulated longitudinal beam, and the horizontal panel of the saddle beam support is fixedly connected to the lower flange of the saddle beam support. The L-shaped rear leaf spring beam support and saddle-mounted beam support are connected to the reaction frame through a second elongated hole in the vertical direction. This allows for vertical adjustment of the simulated rear leaf spring beam and the fixed saddle-mounted beam, enabling adaptation to the height differences of the rear suspension in different vehicle models and further enhancing the test bench's adaptability to multiple vehicle types. At the same time, this structural design allows for precise adjustment of the height of the rear suspension simulation device, ensuring that the installation state of the frame on the test bench is consistent with that of the actual vehicle, thus ensuring the authenticity of the test conditions.

[0012] As a preferred embodiment of a tractor frame bending test bench, the rear suspension simulation device further includes a fixing plate, which is fixedly installed between the two saddle-mounted fixed longitudinal beams. The bottom surface of the fixing plate is connected to the top surface of the six-component force sensor via a simulated saddle assembly. The connection between the fixing plate and the saddle-mounted fixed longitudinal beams provides a stable mounting foundation for the six-component force sensor and the simulated saddle assembly, ensuring that the six-component force sensor can accurately measure the load in the saddle area during the test. The simulated saddle assembly can simulate the connection state between the saddle and the frame of a real vehicle, making the stress boundary conditions of the frame during the test closer to actual driving conditions.

[0013] As a preferred embodiment of a tractor frame bending test bench, the simulated saddle assembly includes an upper bracket and a lower bracket. The bottom of the upper bracket is hinged to the top of the lower bracket, and the hinge axis between the upper and lower brackets is arranged laterally. The bottom surface of the fixing plate is fixedly connected to the upper bracket, and the lower bracket is fixedly connected to the six-component force sensor. This design can simulate the undulations of the saddle caused by uneven road surfaces during actual vehicle operation, allowing the six-component force sensor to more comprehensively measure the dynamic load in the saddle area, further improving the simulation accuracy of the test on actual vehicle operating conditions.

[0014] As a preferred embodiment of a tractor frame bending test bench, the fixing plate is installed below the saddle-mounted fixed longitudinal beam, and the saddle-mounted fixed longitudinal beam is connected to the fixing plate by a bolt assembly. This ensures that the fixing plate and the saddle-mounted fixed longitudinal beam form a stable load-bearing unit, effectively transferring the load during the test.

[0015] As a preferred embodiment of a tractor frame bending test bench, the front leaf spring simulates the longitudinal beam with front and rear connecting parts at both ends. Both the front and rear connecting parts have hinge holes at their upper ends for connecting to the front leaf spring seat of the frame under test. The connection method is consistent with the installation method of the front leaf spring in a real vehicle, accurately simulating the constraint and support effect of the front leaf spring on the frame. This ensures that the boundary constraint conditions of the frame during the test match the actual working conditions, thereby guaranteeing that the test results truly reflect the bending stress performance of the frame during actual driving.

[0016] As can be seen from the above technical solutions, the advantages of this utility model are as follows: The front suspension simulation device of this solution replicates the mechanical path of the actual vehicle through a vertical connection structure. The design of the axle hinge and ball hinge can simulate the pitch motion of the suspension and adapt to complex load directions. The lateral adjustment hole of the loading connection plate is adapted to different wheelbase models. The hydraulic cylinder accurately simulates dynamic loads. The rear suspension simulation device uses a six-component force sensor to monitor three-dimensional loads. The rear leaf spring simulates the longitudinal beam supporting the balance shaft to match the actual vehicle structure. The rectangular reaction frame provides stable support. The vertical adjustment hole of the L-shaped support component is adapted to different vehicle heights. The fixed plate and the simulated saddle assembly ensure accurate load measurement. Its lateral hinge design simulates saddle swing. The bolt connection structure facilitates maintenance. The front leaf spring connector simulates the constraints of the actual vehicle through the hinge hole. Overall, it improves the accuracy of working condition simulation, data reliability, and equipment versatility. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0021] Figure 4 This is a side view of the front suspension simulation device in a specific embodiment of this utility model.

[0022] Figure 5 This is a side view of the rear suspension simulation device in a specific embodiment of this utility model.

[0023] Explanation of main figure symbols

[0024] 01. Front suspension simulation device, 02. Rear suspension simulation device, 03. Frame, 1. Loading mechanism, 2. Front leaf spring simulated longitudinal beam, 3. Front axle simulated crossbeam, 4. Axle hinge, 5. Front connector, 6. Rear connector, 7. Loading connecting plate, 71. Ball joint, 72. First long hole, 8. Reaction frame, 9. Rear leaf spring simulated longitudinal beam, 10. Rear leaf spring beam support, 11. Six-component force sensor, 12. Saddle-mounted fixed longitudinal beam, 13. Fixing plate, 14. Bolt group, 15. Saddle-mounted beam support, 16. Second long hole, 17. Upper bracket, 18. Lower bracket, 19. Balance shaft bracket, 20. Balance shaft, 21. Frame longitudinal beam, 22. Frame crossbeam, 23. Front leaf spring fixing seat. Detailed Implementation

[0025] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0026] This embodiment provides a tractor frame bending fatigue durability test bench for testing the bending fatigue durability of frame 03.

[0027] like Figure 1As shown, the frame 03 includes two parallel longitudinal beams 21, which are connected by multiple crossbeams 22. Each longitudinal beam 21 has two front leaf spring mounting seats 23 on its front lower wing surface for mounting the front leaf spring, which are connected to the lugs at both ends of the front leaf spring by pins. A balance shaft 20 is provided below the rear saddle position of the frame 03, and the balance shaft 20 is connected to the middle position of the rear leaf spring.

[0028] like Figure 1 As shown, this test bench includes a front suspension simulation device 01 and a rear suspension simulation device 02:

[0029] The front suspension simulation device 01 includes a front axle simulation crossbeam 3 and two front leaf spring simulation longitudinal beams 2. Taking the superstructure position of the frame 03 as a layout reference, the front axle simulation crossbeam 3 is located below the front leaf spring mounting area of ​​the front part of the frame 03, and is perpendicular to the frame longitudinal beams 21. The two front leaf spring simulation longitudinal beams 2 are respectively located below the front sides of the frame 03, and are parallel to the frame longitudinal beams 21. The two front leaf spring simulation longitudinal beams 2 are respectively vertically connected to the lower wing surface of the front axle simulation crossbeam 3. Specifically, in conjunction with... Figure 4 The front axle simulated crossbeam 3 and the front leaf spring simulated longitudinal beam 2 are connected by a shaft hinge 4, the pivot of which is arranged longitudinally (i.e., in the direction of the frame longitudinal beam). Loading mechanisms 1 are also provided at both ends of the upper flange of the front axle simulated crossbeam 3. In this embodiment, the loading mechanism 1 is a hydraulic cylinder, such as... Figure 2 As shown, loading connection plates 7 are respectively provided at both ends of the upper flange of the front axle simulated crossbeam 3. The lower end of the loading mechanism 1 is mounted on the loading connection plate 7 via a ball joint 71, and the upper end of the loading mechanism 1 is fixedly installed (e.g., suspended by a gantry). A first elongated hole 72 is provided on the loading connection plate 7. The first elongated hole 72 is arranged laterally (i.e., in the direction of the frame crossbeam, perpendicular to the longitudinal direction). The loading connection plate 7 and the front axle simulated crossbeam 3 are connected by a first bolt. The first bolt passes through the first elongated hole 72. Thus, by moving the loading connection plate 7 laterally through the first elongated hole, the position of the loading mechanism 1 on the front axle simulated crossbeam 3 is changed, thereby simulating vehicles with different wheelbases. The two ends of the upper flange of the front leaf spring simulated longitudinal beam 2 are provided with frame connection structures, such as... Figure 4 As shown, the frame connection structure 2 includes a front connector 5 and a rear connector 6. The front connector 5 and the rear connector 6 are located at both ends of the front leaf spring simulated longitudinal beam 2, respectively. The upper ends of the front connector 5 and the rear connector 6 are provided with hinge holes. When installed, the hinge holes are aligned with the front leaf spring fixing seat of the frame 03 and a pin is inserted to complete the connection between the front suspension simulation device 01 and the frame 03, and to simulate the installation form of the coiled ear.

[0030] like Figure 1 , 5As shown, the rear suspension simulation device 02 includes four reaction frames 8, which are located in pairs on both sides of the rear of the frame 03, i.e., two reaction frames 8 are set on one side, and the reaction frames 8 on both sides are opposite each other in the lateral direction, forming a rectangular arrangement. On each side of the frame 03, a rear leaf spring simulated longitudinal beam 9 and a saddle-mounted fixed longitudinal beam 12 are installed on the two reaction frames 8. The two ends of the saddle-mounted fixed longitudinal beam 12 and the two ends of the rear leaf spring simulated longitudinal beam 9 are respectively fixedly installed on the two reaction frames 8 located on the same side of the frame 03. The rear leaf spring simulated longitudinal beam 9 is located below the saddle-mounted fixed longitudinal beam 12. Specifically, in conjunction with... Figure 3 The reaction frame 8 is equipped with a rear leaf spring beam support 10 and a saddle beam support 15 on its side facade. Both the rear leaf spring beam support 10 and the saddle beam support 15 are L-shaped. A second elongated hole 16 is provided on the vertical panel of the rear leaf spring beam support 10 and the saddle beam support 15. The second elongated hole 16 is set in the vertical direction. Both the rear leaf spring beam support 10 and the saddle beam support 15 are connected to the reaction frame 8 by a second bolt. The second bolt passes through the corresponding second elongated hole 16. The horizontal panel of the rear leaf spring beam support 10 is fixedly connected to the lower wing surface of the rear leaf spring simulated longitudinal beam 9. The horizontal panel of the saddle beam support 15 is fixedly connected to the lower wing surface of the saddle beam support 15.

[0031] As can be seen, the rear suspension simulation device 02 has two rear leaf spring simulated longitudinal beams 9 and two saddle-mounted fixed longitudinal beams 12. The rear leaf spring simulated longitudinal beams 9 are used to support the balance shaft of the frame under test, such as... Figure 5 As shown, the middle part of the balance shaft 20 is connected to the longitudinal beam of the frame, and the two ends of the balance shaft 20 are provided with balance shaft brackets 19. The balance shaft brackets 19 have a V-shaped structure, and the balance shaft 20 is fixed in the middle groove of the V-shape. The two ends of the balance shaft brackets 19 are fixedly connected to the rear leaf spring simulated longitudinal beam 9. A six-component force sensor 11 is jointly installed on both of the two saddle-mounted fixed longitudinal beams 12. The six-component force sensor 11 is located above the rear leaf spring simulated longitudinal beam 9. Specifically, the rear suspension simulation device 02 also includes a fixing plate 13, which is fixedly installed between the two saddle-mounted fixed longitudinal beams 12 and located below the saddle-mounted fixed longitudinal beams 12. The saddle-mounted fixed longitudinal beams 12 are connected to the fixing plate 13 by bolt group 14. The bottom surface of the fixing plate 13 is connected to the top surface of the six-component force sensor 11 through a simulated saddle assembly. The simulated saddle assembly includes an upper bracket 17 and a lower bracket 18. The bottom of the upper bracket 17 is hinged to the top of the lower bracket 18. The hinge axis between the upper bracket 17 and the lower bracket 18 is arranged laterally. The bottom surface of the fixing plate 13 is fixedly connected to the upper bracket 17, and the lower bracket 18 is fixedly connected to the six-component force sensor 11.

[0032] When the rear suspension simulation device 02 is connected to the vehicle frame, the rear leaf spring simulated longitudinal beam 9 is connected to the balance shaft support 19. The position of the rear leaf spring beam support 10 and / or the saddle beam support 15 is adjusted through the second long hole so that the six-component force sensor 11 is fixedly connected to the upper wing surface at the rear of the vehicle frame 03.

[0033] When this test bench is in use, the rear of the vehicle frame is fixed by the rear suspension simulation device 02 to simulate the load fixed on the saddle. Then, the loading mechanism in the front suspension simulation device 01 at the front of the vehicle frame drives the front axle simulation beam 3 and the front leaf spring simulation beam 2 to move, simulating the under-wheel dynamics of the vehicle frame. The six-component force sensor 11 detects the influence of the front under-wheel dynamics on the rear saddle.

[0034] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: the front suspension simulation device of this solution replicates the mechanical path of the actual vehicle through a vertical connection structure; the axle hinge and ball hinge design can simulate the pitch motion of the suspension and adapt to complex load directions; the lateral adjustment hole of the loading connection plate is adapted to different wheelbase models; and the hydraulic cylinder accurately simulates dynamic loads. The rear suspension simulation device uses a six-component force sensor to monitor three-dimensional loads; the rear leaf spring simulates the longitudinal beam supporting the balance shaft to match the actual vehicle structure; the rectangular reaction frame provides stable support; the vertical adjustment hole of the L-shaped support component is adapted to different vehicle heights; the fixed plate and the simulated saddle assembly ensure accurate load measurement; its lateral hinge design simulates saddle swing; the bolt connection structure facilitates maintenance; and the front leaf spring connector simulates the constraints of the actual vehicle through the hinge hole. Overall, it improves the accuracy of working condition simulation, data reliability, and equipment versatility.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tractor frame bending test stand characterized by, Includes a front suspension simulation device (01) and a rear suspension simulation device (02): The front suspension simulation device (01) includes a front axle simulation crossbeam (3) and two front leaf spring simulation longitudinal beams (2). The two front leaf spring simulation longitudinal beams (2) are respectively vertically connected to the lower wing surface of the front axle simulation crossbeam (3). Loading mechanisms (1) are also provided at both ends of the upper wing surface of the front axle simulation crossbeam (3). The upper wing surface of the front leaf spring simulation longitudinal beam (2) is provided with a frame connection structure at both ends. The rear suspension simulation device (02) includes two rear leaf spring simulation longitudinal beams (9) and two saddle-mounted fixed longitudinal beams (12). A six-component force sensor (11) is provided on both of the saddle-mounted fixed longitudinal beams (12). The six-component force sensor (11) is located above the rear leaf spring simulation longitudinal beams (9). The rear leaf spring simulation longitudinal beams (9) are used to support the balance shaft of the vehicle frame under test.

2. The tractor frame bend test stand of claim 1, wherein, The front axle simulated crossbeam (3) and the front leaf spring simulated longitudinal beam (2) are connected by a shaft hinge (4). The shaft of the shaft hinge (4) is arranged longitudinally. Loading connecting plates (7) are provided at both ends of the upper wing surface of the front axle simulated crossbeam (3). The loading mechanism (1) is installed on the loading connecting plate (7) by a ball hinge (71).

3. The tractor frame bend test stand of claim 2, wherein, The loading connection plate (7) has a first elongated hole (72) arranged in the transverse direction. The loading connection plate (7) and the front axle simulated crossbeam (3) are connected by a first bolt, which passes through the first elongated hole (72).

4. The tractor frame bend test stand of claim 1, wherein, The loading mechanism (1) is a hydraulic cylinder.

5. The tractor frame bend test stand of claim 1, wherein, The rear suspension simulation device (02) also includes four reaction frames (8), which are arranged in a rectangular pattern and paired on both sides of the vehicle frame to be tested. Located on the same side of the vehicle frame to be tested, both ends of the saddle-mounted fixed longitudinal beam (12) and both ends of the rear leaf spring simulated longitudinal beam (9) are respectively fixedly installed on the two reaction frames (8).

6. The tractor frame bend test stand of claim 5, wherein, The reaction frame (8) is equipped with a rear leaf spring beam support (10) and a saddle beam support (15) on its side facade. Both the rear leaf spring beam support (10) and the saddle beam support (15) are L-shaped. A second elongated hole (16) is provided on the vertical panel of the rear leaf spring beam support (10) and the saddle beam support (15). The second elongated hole (16) is set in the vertical direction. Both the rear leaf spring beam support (10) and the saddle beam support (15) are connected to the reaction frame (8) by a second bolt. The second bolt passes through the corresponding second elongated hole (16). The horizontal panel of the rear leaf spring beam support (10) is fixedly connected to the lower wing surface of the rear leaf spring simulated longitudinal beam (9). The horizontal panel of the saddle beam support (15) is fixedly connected to the lower wing surface of the saddle beam support (15).

7. The tractor frame bend test stand of claim 1, wherein, The rear suspension simulation device (02) also includes a fixing plate (13), which is fixedly installed between the two saddle-mounted fixed longitudinal beams (12). The bottom surface of the fixing plate (13) is connected to the top surface of the six-component force sensor (11) through a simulated saddle assembly.

8. The tractor frame bend test stand of claim 7, wherein, The simulated saddle assembly includes an upper bracket (17) and a lower bracket (18). The bottom of the upper bracket (17) is hinged to the top of the lower bracket (18). The hinge axis between the upper bracket (17) and the lower bracket (18) is arranged in the transverse direction. The bottom surface of the fixing plate (13) is fixedly connected to the upper bracket (17). The lower bracket (18) is fixedly connected to the six-component force sensor (11).

9. The tractor frame bend test stand of claim 7, wherein, The fixing plate (13) is installed below the saddle-mounted fixing longitudinal beam (12), and the saddle-mounted fixing longitudinal beam (12) is connected to the fixing plate (13) by a bolt group (14).

10. The tractor frame bend test stand of claim 1, wherein, The front leaf spring simulated longitudinal beam (2) has a front connector (5) and a rear connector (6) at both ends of its upper wing surface. The upper ends of the front connector (5) and the rear connector (6) are provided with hinge holes for connecting the front leaf spring fixing seat of the vehicle frame to be tested.

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