A device and method for simulating the change of the rear suspension spring during the operation of a real vehicle

Abstract

The present application discloses a device and method for simulating the change of the rear suspension spring during the operation of a real vehicle, which relates to the technical field of suspension simulation test equipment. The device includes a simulation frame, on which an upper suspension is fixedly arranged, and a lower suspension is rotatably arranged. A damping element is installed between the upper suspension and the lower suspension. A load simulation unit for applying a dynamic load to the lower suspension is arranged on the simulation frame. A load detection unit for detecting the load on the suspension spring is arranged on the lower suspension, and a deformation detection unit for detecting the deformation degree of the suspension spring is arranged on the upper suspension. A control system is arranged on the simulation frame. The control system is provided with a data processing module, and the control system is electrically connected to the load simulation unit, the load detection unit, and the deformation detection unit respectively. The present application can accurately simulate and detect the change of the rear suspension spring during the operation of a real vehicle, and improve the accuracy and reliability of the detection results.

Description

Technical Field

[0001] This application relates to the technical field of suspension simulation test equipment, and in particular to a device and method for simulating the change of the rear suspension spring during actual vehicle operation. Background Art

[0002] An automotive suspension spring is an elastic element in an automotive suspension, which elastically connects the axle and the frame or body, bears and transmits vertical loads, and alleviates and suppresses the impact caused by uneven road surfaces. The performance of the rear suspension spring directly affects the comfort, handling, and safety of the vehicle.

[0003] Currently, when studying the characteristics of the rear suspension spring, static compression experiments and dynamic fatigue tests are usually carried out to obtain the required data. Among them, the static compression experiment mainly uses a press to directly act on both end faces of the spring to measure the elastic force values at different strokes; the dynamic fatigue test is to repeatedly apply vibration loads with a specified frequency and amplitude by means of special equipment to evaluate the durability performance.

[0004] However, these traditional methods above cannot comprehensively and accurately reproduce the complex and changeable force conditions in the real driving environment, especially the lack of detection of the angular changes accompanying the up and down movement of the suspension, resulting in the obtained results may deviate from the actual situation. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, this application provides a device and method for simulating the change of the rear suspension spring during actual vehicle operation.

[0006] In a first aspect, a device for simulating the change of the rear suspension spring during actual vehicle operation provided by this application adopts the following technical solution:

[0007] A device for simulating the change of the rear suspension spring during actual vehicle operation includes a simulation frame, on which an upper suspension is fixedly arranged, a lower suspension is rotatably arranged on the simulation frame, and a damping element is installed between the upper suspension and the lower suspension; an installation mechanism for installing the suspension spring is arranged on the upper suspension, and a connecting piece for connecting the suspension spring is arranged on the lower suspension; a load simulation unit for applying a dynamic load to the lower suspension is arranged on the simulation frame; a load detection unit for detecting the load received by the suspension spring is arranged on the lower suspension, a deformation detection unit for detecting the deformation degree of the suspension spring is arranged on the upper suspension, a control system is arranged on the simulation frame, the control system is provided with a data processing module, and the control system is electrically connected to the load simulation unit, the load detection unit, and the deformation detection unit respectively.

[0008] Optionally, the installation mechanism includes an installation sleeve, a cover plate, and a locking member. The installation sleeve is fixedly arranged on the upper suspension, the cover plate is rotatably arranged on the top of the installation sleeve, and the locking member is used to fix the cover plate on the installation sleeve.

[0009] Optionally, the connecting member includes an installation block fixedly arranged on the lower suspension. An installation groove for placing the suspension spring is arranged on the installation block, and a connecting column is fixedly arranged in the installation groove.

[0010] Optionally, the load detection unit includes a pressure sensor and a load plate. The pressure sensor is fixedly installed on the bottom wall of the installation groove. The load plate is slidably arranged in the installation groove and abuts against the pressure sensor. The load plate is adapted to the installation groove, and a central hole for the connecting column to pass through is arranged on the load plate.

[0011] Optionally, the deformation detection unit includes an infrared scanner. The infrared scanner is installed on the upper suspension and is used to scan and record the surface profile of the suspension spring. The infrared scanner is electrically connected to the control system.

[0012] Optionally, the load simulation unit includes a hydraulic cylinder and a touch block. The hydraulic cylinder is fixedly arranged on the simulation frame, the touch block is fixedly arranged on the piston rod of the hydraulic cylinder, and the hydraulic cylinder is electrically connected to the control system.

[0013] Optionally, a slider is slidably arranged on the lower suspension along the length direction of the lower suspension. A positioning block is also installed on the lower suspension. A magnet is arranged on the positioning block. A metal magnetic sheet for adsorbing on the magnet is arranged on the slider. A connecting block is rotatably arranged on the slider. A torsion spring is sleeved on the rotating shaft of the connecting block, and both ends of the torsion spring are fixedly connected to the connecting block and the slider respectively. A groove for the touch block to insert into is arranged on the connecting block.

[0014] Optionally, the positioning block is slidably arranged on the lower suspension along the length direction of the lower suspension. A servo cylinder for driving the positioning block to slide is arranged on the lower suspension. An infrared signal transmitter is arranged on the slider, and an infrared signal receiver is arranged on the touch block. The servo cylinder, the infrared signal transmitter, and the infrared signal receiver are all electrically connected to the control system.

[0015] Optionally, side plates are fixedly arranged on both sides of the slider. Elastic pressing plates are fixedly arranged at one ends of the two side plates close to each other. Sliding grooves for the elastic pressing plates to be clamped into are arranged on both sides of the lower suspension along the length direction of the lower suspension. A plurality of rollers are rotatably arranged on the slider, and each roller is in rolling connection with the lower side wall of the lower suspension.

[0016] In a second aspect, the present application provides a simulation method for a device simulating the change of the rear suspension spring during actual vehicle operation, adopting the following technical solution:

[0017] A simulation method for a device simulating the change of the rear suspension spring during actual vehicle operation, comprising the following steps:

[0018] S1. Install the suspension spring between the upper suspension and the lower suspension through the mounting mechanism on the upper suspension and the connecting member on the lower suspension;

[0019] S2. Start the control system and set the test parameters, including the load range, load change frequency, and test time;

[0020] S3. Start the load simulation unit, apply a dynamic load to the lower suspension, and buffer the movement of the lower suspension by introducing damping elements to simulate the actual load condition of the suspension spring during actual vehicle operation;

[0021] S4. During the test, use the load detection unit to detect and feedback the actual load value borne by the suspension spring in real time, and use the deformation detection unit to accurately reflect the deformation of the suspension spring under different loads;

[0022] S5. Transmit the data detected by the load detection unit and the deformation detection unit to the control system, and comprehensively analyze and process the detected data through the data processing module to achieve a synchronous quantitative evaluation of the relationship between the spring deformation state and the load borne.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The present application can accurately simulate and detect the change of the rear suspension spring during actual vehicle operation, improving the accuracy and reliability of the detection results. Specifically, the suspension spring is installed between the upper suspension and the lower suspension through the mounting mechanism on the upper suspension and the connecting member on the lower suspension; a dynamic load is applied to the lower suspension through the load simulation unit, and the movement of the lower suspension is buffered by introducing damping elements to simulate the actual load condition of the suspension spring during actual vehicle operation; during the test, the load detection unit is used to detect and feedback the actual load value borne by the suspension spring in real time, and the deformation detection unit is used to accurately reflect the deformation of the suspension spring under different loads, and then the data processing module comprehensively analyzes and processes the detected data to achieve a synchronous quantitative evaluation of the relationship between the spring deformation state and the load borne, ensuring the accuracy and reliability of the detection results.

[0025] 2. In this application, a slider is slidably arranged on the lower suspension, and the quick positioning and fixing of the slider are achieved by cooperating with the magnet on the positioning block and the metal magnetic sheet on the slider; when the hydraulic cylinder applies a dynamic load to the lower suspension, the touch block is connected to the slider, and the touch block pushes the slider to slide on the lower suspension, thereby effectively reducing the wear or deformation caused by mechanical impact between the touch block and the lower suspension.

[0026] 3. In this application, a connecting block is rotatably arranged on the slider, and the connecting block is connected to the slider through a torsion spring. When the touch block is connected to the slider, the touch block is inserted into the groove on the connecting block, and as the hydraulic cylinder continuously applies a load, the lower suspension rotates on the simulation frame. During this process, the connecting block rotates on the slider adaptively to the change in the angle of the lower suspension to ensure stable contact between the touch block and the connecting block, thereby improving the connection stability between the touch block and the slider.

[0027] 4. In this application, the positioning block is slidably arranged on the lower suspension, and a servo cylinder is set to push the lower suspension to slide. After the suspension spring completes the test, the servo cylinder drives the positioning block to slide towards the slider. By the magnet on the positioning block adsorbing the metal magnetic sheet on the slider, the slider can move together with the positioning block. At the same time, by arranging an infrared signal transmitter on the slider and an infrared signal receiver on the touch block, when the infrared signal transmitter and the infrared signal receiver are accurately aligned, the control system can accurately judge the positional relationship and stop the movement of the positioning block, thereby ensuring the precise alignment between the connecting block and the touch block. This design significantly reduces manual intervention and improves the test efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the overall structural schematic diagram of the embodiment of this application;

[0029] Figure 2 is the structural schematic diagram of the installation mechanism used in the embodiment of this application;

[0030] Figure 3 is the structural sectional view of the installation block used in the embodiment of this application;

[0031] Figure 4 is the structural schematic diagram of the slider used in the embodiment of this application;

[0032] Figure 5 is the structural sectional view of the slider used in the embodiment of this application;

[0033] Figure 6 is the structural schematic diagram of the elastic pressing plate used in the embodiment of this application.

[0034] Description of the reference numerals: 1. Simulation rack; 11. Upper suspension; 111. Mounting sleeve; 112. Cover plate; 113. Locking member; 12. Lower suspension; 121. Servo cylinder; 122. Slide groove; 123. Wheel groove; 13. Damping element; 14. Mounting block; 141. Mounting groove; 142. Connecting column; 15. Slide block; 151. Metal magnetic sheet; 152. Connecting block; 1521. Groove; 153. Torsion spring; 154. Infrared signal transmitter; 155. Side plate; 156. Elastic pressing plate; 157. Roller; 16. Positioning block; 161. Magnet; 2. Load simulation unit; 21. Hydraulic cylinder; 22. Touching block; 221. Infrared signal receiver; 3. Control system; 31. Control panel; 4. Load detection unit; 41. Pressure sensor; 42. Load plate; 143. Limit block; 5. Deformation detection unit; 51. Infrared scanner. Detailed implementation manners

[0035] The following will combine with the attached Figure 1 - attached Figure 6 to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can fully combine the embodiments of the present invention to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present invention.

[0036] The inventors of the present application found that the existing suspension spring detection methods mainly rely on static compression experiments and dynamic fatigue tests. However, these traditional methods cannot comprehensively and accurately reproduce the complex and variable force conditions in the real driving environment, especially the lack of detection of the angle changes accompanied by the up and down movement of the suspension, resulting in the obtained results may deviate from the actual situation. For this reason, the present application discloses a device and method for simulating the changes of the rear suspension spring during real vehicle operation, mainly adopting the following solutions:

[0037] The embodiments of the present application disclose a device for simulating the changes of the rear suspension spring during real vehicle operation. Referring to Figure 1 , it includes a simulation rack 1. An upper suspension 11 and a lower suspension 12 are arranged on the simulation rack 1. The upper suspension 11 is fixed to the upper part of the simulation rack 1, and the lower suspension 12 is rotatably connected to the bottom area of the simulation rack 1. An installation mechanism is provided on the upper suspension 11, and a connecting member is arranged in the structure of the lower suspension 12. The suspension spring is stably installed between the upper suspension 11 and the lower suspension 12 through the installation mechanism and the connecting member.

[0038] Referring to Figure 1 , a damping element 13 is arranged between the upper suspension 11 and the lower suspension 12; specifically, the damping element 13 adopts a shock absorber, and the main body and the movable rod of the shock absorber are respectively hinged to the lower suspension 12 and the upper suspension 11 to absorb vibration energy and prevent the lower suspension 12 from rebounding excessively.

[0039] Reference Figure 1 The simulation frame 1 is provided with a load simulation unit 2 for applying a dynamic load to the lower suspension 12; specifically, the load simulation unit 2 includes a hydraulic cylinder 21 and a touch block 22. The hydraulic cylinder 21 is fixed to the simulation frame 1, and the touch block 22 is fixed to the end of the piston rod of the hydraulic cylinder 21. The touch block 22 is driven by the hydraulic cylinder 21 to slide toward the lower suspension 12, and the lower suspension 12 is pushed by the touch block 22 to deflect toward the upper suspension 11, and the suspension spring is compressed, thereby simulating the scene of the actual vehicle operation.

[0040] Reference Figure 1 A control system 3 is provided on the simulation frame 1, the control system 3 is electrically connected to a control panel 31, a data processing module is provided on the control system 3, the hydraulic cylinder 21 is electrically connected to the control system 3, the test parameters are set through the control system 3, and the hydraulic cylinder 21 applies a load to the lower suspension 12.

[0041] Furthermore, the hydraulic cylinder 21 can adopt a variety of methods when applying load to the lower suspension 12. For example, by slowly applying pressure, it can simulate the flat slope section in the operation of the actual vehicle; it can also repeatedly apply a vibration load of a specified frequency and amplitude to the lower suspension 12 to simulate the bumpy section in the operation of the actual vehicle; in addition, it is also possible to impact the lower suspension 12 through the touch block 22 to apply an instantaneous load to the lower suspension 12 to simulate the situation of obstacles in the operation of the actual vehicle.

[0042] Reference Figure 1 , 2 Specifically, the mounting mechanism includes a mounting sleeve 111, a cover plate 112 and a locking piece 113. The mounting sleeve 111 can be fixed to the upper suspension 11 by welding or bolts, and has a cylindrical shape; the cover plate 112 is mounted on the top of the mounting sleeve 111, and is rotatably connected to the mounting sleeve 111 by a hinge, so as to close the top opening of the mounting sleeve 111; the locking piece 113 adopts a lock buckle, which is mounted on the mounting sleeve 111, and is used to fix the cover plate 112 on the mounting sleeve 111.

[0043] Reference Figure 3 The connecting piece includes a mounting block 14, which is fixed to the top of the lower suspension 12 by welding or bolts, and is provided with a mounting groove 141 adapted to the product specifications. At the same time, a connecting column 142 is provided at the center of the mounting groove 141. Through the mutual cooperation of the mounting sleeve 111 and the mounting groove 141 on the mounting block 14, the two ends of the suspension spring are constrained, so that the suspension spring is stably installed between the upper suspension 11 and the lower suspension 12.

[0044] Reference Figure 3, a load detection unit 4 for detecting the load on the suspension spring is provided on the lower suspension 12; specifically, the load detection unit 4 includes a pressure sensor 41 and a load plate 42. The pressure sensor 41 is fixedly installed on the bottom wall of the installation groove 141. The load plate 42 is slidably arranged in the installation groove 141 along the length direction of the connecting column 142 and abuts against the pressure sensor 41. The load plate 42 is adapted to the installation groove 141. A central hole for the connecting column 142 to pass through is provided on the load plate 42. A limiting block 143 for preventing the load plate 42 from detaching from the installation groove 141 is fixedly provided at the end of the connecting column 142. When the suspension spring is placed in the installation groove 141 of the installation block 14, the end of the suspension spring abuts against the load plate 42, and the pressure sensor 41 can accurately sense the load on the suspension spring in real time.

[0045] Refer to Figure 1 , 3 , a deformation detection unit 5 for detecting the deformation degree of the suspension spring is provided on the upper suspension 11; specifically, the deformation detection unit 5 includes an infrared scanner 51. The infrared scanner 51 is fixedly installed on the upper suspension 11 and is used to scan and record the surface contour of the suspension spring. The infrared scanner 51 can accurately scan and record the surface contour of the suspension spring and monitor the morphological changes of the spring under different load conditions in real time. The pressure sensor 41 and the infrared scanner 51 are both electrically connected to the control system 3. The pressure sensor 41 and the infrared scanner 51 transmit the detected data to the control system 3, and through the data processing module, the detected data is comprehensively analyzed and processed, realizing the synchronous quantitative evaluation of the relationship between the spring deformation state and the load borne.

[0046] Refer to Figure 4 , 5, on the lower suspension 12, a slider 15 and a positioning block 16 are respectively slidably arranged along the length direction of the lower suspension 12. The positioning block 16 is arranged on one side of the slider 15 close to the rotating shaft of the lower suspension 12. A servo cylinder 121 is also installed on the lower suspension 12. The piston rod of the servo cylinder 121 is connected to the positioning block 16 and is used to drive the positioning block 16 to slide. A magnet 161 is arranged on the end face of the positioning block 16 close to the slider 15, and a metal magnetic sheet 151 is arranged on the end face of the slider 15 close to the positioning block 16, which is used to cooperate with the magnet 161 on the positioning block 16 to adsorb the slider 15 on the positioning block 16 and position the slider 15. By slidably arranging the slider 15 on the lower suspension 12 and cooperating with the magnet 161 on the positioning block 16 and the metal magnetic sheet 151 on the slider 15, the quick positioning and fixing of the slider 15 are realized. When the hydraulic cylinder 21 applies a dynamic load to the lower suspension 12, the touch block 22 is connected to the slider 15, and as the hydraulic cylinder 21 continuously applies the load, the lower suspension 12 rotates on the simulation frame 1, and the touch block 22 pushes the slider 15 to slide on the lower suspension 12, so that the slider 15 is separated from the positioning block 16, thereby effectively reducing the wear or deformation caused by mechanical impact between the touch block 22 and the lower suspension 12.

[0047] Refer to Figure 4 , 5 , Further, a connecting block 152 is rotatably arranged on the slider 15. A torsion spring 153 is sleeved on the rotating shaft of the connecting block 152, and both ends of the torsion spring 153 are fixedly connected to the connecting block 152 and the slider 15 respectively. A groove 1521 for the touch block 22 to insert is arranged on the connecting block 152. By rotatably arranging the connecting block 152 on the slider 15 and connecting the connecting block 152 to the slider 15 through the torsion spring 153; when the touch block 22 applies a load to the lower suspension 12, the touch block 22 is inserted into the groove 1521 on the connecting block 152. During the rotation of the lower suspension 12 and the sliding of the slider 15, the connecting block 152 rotates on the slider 15 adaptively to the change of the angle of the lower suspension 12, ensuring the stable contact between the touch block 22 and the connecting block 152, thereby improving the connection stability between the touch block 22 and the slider 15.

[0048] Refer to Figure 4, Further, an infrared signal transmitter 154 is provided on the slider 15, and an infrared signal receiver 221 is provided on the touch block 22. The servo cylinder 121, the infrared signal transmitter 154, and the infrared signal receiver 221 are all electrically connected to the control system 3. When the suspension spring is tested and completed, the control system 3 controls the servo cylinder 121 to start, driving the positioning block 16 to slide towards the slider 15. The metal magnetic sheet 151 on the slider 15 is adsorbed by the magnet 161 on the positioning block 16, so that the slider 15 can move together with the positioning block 16. At the same time, by providing the infrared signal transmitter 154 on the slider 15 and the infrared signal receiver 221 on the touch block 22, when the infrared signal transmitter 154 and the infrared signal receiver 221 are accurately aligned, the control system 3 can accurately judge the positional relationship and stop the movement of the positioning block 16, thereby ensuring the accurate alignment between the connecting block 152 and the touch block 22. This design significantly reduces manual intervention and improves the test efficiency and accuracy.

[0049] Refer to Figure 6 , Side plates 155 are fixedly provided on both sides of the slider 15. Elastic pressing plates 156 are fixedly provided at one end of the two side plates 155 close to each other. The elastic pressing plates 156 are made of plastic or elastic steel. Chutes 122 for the elastic pressing plates 156 to be inserted into are provided along the length direction of the lower suspension 12 on both sides of the lower suspension 12. The side plates 155 on both sides of the slider 15 and the elastic pressing plates 156 provided on the side plates 155 can ensure that the slider 15 is stably embedded in the chutes 122 on both sides of the lower suspension 12, thereby improving the stability of the slider 15 when moving along the lower suspension 12 and avoiding accuracy loss caused by shaking.

[0050] Refer to Figure 5 , 6 , A plurality of groups of rollers 157 are rotatably provided on the slider 15. A wheel groove 123 is provided on the bottom wall of the lower suspension 12 along the length direction of the lower suspension 12. Each roller 157 is arranged in the wheel groove 123 and is in rolling connection with the lower suspension 12. Each roller 157 is always in tight contact with the side wall of the wheel groove 123 under the elastic force of the elastic pressing plate 156. The setting of the rollers 157 effectively reduces the frictional resistance during the movement of the slider 15, makes the movement of the slider 15 on the lower suspension 12 smoother, and improves the response speed and operation flexibility of the entire device.

[0051] The implementation principle of a device for simulating the change of the rear suspension spring during actual vehicle operation in an embodiment of the present application is as follows: The suspension spring is installed between the upper suspension 11 and the lower suspension 12 through the installation mechanism on the upper suspension 11 and the connecting member on the lower suspension 12; a dynamic load is applied to the lower suspension 12 through the load simulation unit 2, and the introduction of the damping element 13 is used to buffer the movement of the lower suspension 12, thereby simulating the actual load condition of the suspension spring during actual vehicle operation; during the test, the load detection unit 4 is used to detect and feedback the actual load value borne by the suspension spring in real time, and the deformation detection unit 5 is used to accurately reflect the deformation of the suspension spring under different loads. Then, the data processing module comprehensively analyzes and processes the detected data, realizing the synchronous quantitative evaluation of the relationship between the spring deformation state and the load borne, ensuring the accuracy and reliability of the detection results.

[0052] An embodiment of the present application also discloses a simulation method for a device for simulating the change of the rear suspension spring during actual vehicle operation, including the following steps:

[0053] S1. Install the suspension spring between the upper suspension 11 and the lower suspension 12 through the installation mechanism on the upper suspension 11 and the connecting member on the lower suspension 12;

[0054] S2. Start the control system 3 and set the test parameters, including the load range, load change frequency, and test time;

[0055] S3. Start the load simulation unit 2 to apply a dynamic load to the lower suspension 12, and introduce the damping element 13 to buffer the movement of the lower suspension 12, simulating the actual load condition of the suspension spring during actual vehicle operation;

[0056] S4. During the test, use the load detection unit 4 to detect and feedback the actual load value borne by the suspension spring in real time, and use the deformation detection unit 5 to accurately reflect the deformation of the suspension spring under different loads;

[0057] S5. Transmit the data detected by the load detection unit 4 and the deformation detection unit 5 to the control system 3, and comprehensively analyze and process the detected data through the data processing module, realizing the synchronous quantitative evaluation of the relationship between the spring deformation state and the load borne.

[0058] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A device for simulating the change of rear suspension spring during the operation of a real vehicle, characterized in that: The invention comprises a simulation frame (1), wherein an upper suspension frame (11) is fixedly arranged on the simulation frame (1), a lower suspension frame (12) is rotatably arranged on the simulation frame (1), and a damping element (13) is installed between the upper suspension frame (11) and the lower suspension frame (12); a mounting mechanism for mounting a suspension spring is arranged on the upper suspension frame (11), and a connecting piece for connecting the suspension spring is arranged on the lower suspension frame (12); and a connecting piece for applying a dynamic load to the lower suspension frame (12) is arranged on the simulation frame (1). A load simulation unit (2); the lower suspension (12) is provided with a load detection unit (4) for detecting the load on the suspension spring, the upper suspension (11) is provided with a deformation detection unit (5) for detecting the degree of deformation of the suspension spring, the simulation frame (1) is provided with a control system (3), the control system (3) is provided with a data processing module, and the control system (3) is electrically connected to the load simulation unit (2), the load detection unit (4) and the deformation detection unit (5) respectively; The load simulation unit (2) comprises a hydraulic cylinder (21) and a touch block (22), wherein the hydraulic cylinder (21) is fixedly arranged on the simulation frame (1), and the touch block (22) is fixedly arranged on the piston rod of the hydraulic cylinder (21), and the hydraulic cylinder (21) is electrically connected to the control system (3); A slider (15) is slidably arranged on the lower suspension (12) along the length direction of the lower suspension (12), and a positioning block (16) is also installed on the lower suspension (12). A magnet (161) is arranged on the positioning block (16), and a metal magnetic sheet (151) for adsorbing on the magnet (161) is arranged on the slider (15). A connecting block (152) is rotatably arranged on the slider (15), and a torsion spring (153) is sleeved on the rotating shaft of the connecting block (152), and the two ends of the torsion spring (153) are respectively fixedly connected to the connecting block (152) and the slider (15), and a groove (1521) for inserting a touch block (22) is arranged on the connecting block (152).

2. The device for changing the rear suspension spring during simulation of the operation of a real vehicle according to claim 1, characterized in that: The mounting mechanism comprises a mounting sleeve (111), a cover plate (112) and a locking member (113); the mounting sleeve (111) is fixedly arranged on the upper suspension frame (11); the cover plate (112) is rotatably arranged on the top of the mounting sleeve (111); and the locking member (113) is used to fix the cover plate (112) on the mounting sleeve (111).

3. The device for changing the rear suspension spring during simulation of the operation of a real vehicle according to claim 2, characterized in that: The connecting member comprises a mounting block (14) fixedly arranged on the lower suspension (12); a mounting groove (141) for accommodating a suspension spring is arranged on the mounting block (14); a connecting column (142) is fixedly arranged in the mounting groove (141).

4. The device for changing the rear suspension spring during simulation of the operation of a real vehicle according to claim 3, characterized in that: The load detection unit (4) comprises a pressure sensor (41) and a load plate (42); the pressure sensor (41) is fixedly mounted on the bottom wall of the mounting groove (141); the load plate (42) is slidably mounted in the mounting groove (141) and abuts against the pressure sensor (41); the load plate (42) is adapted to the mounting groove (141); and a central hole for a connecting column (142) to pass through is provided on the load plate (42).

5. The device for changing the rear suspension spring during simulation of the operation of a real vehicle according to claim 1, characterized in that: The deformation detection unit (5) comprises an infrared scanner (51), which is mounted on the upper suspension (11) and is used to scan and record the surface profile of the suspension spring. The infrared scanner (51) is electrically connected to the control system (3).

6. The device for changing the rear suspension spring during simulation of the operation of a real vehicle according to claim 1, characterized in that: The positioning block (16) is slidably arranged on the lower suspension (12) along the length direction of the lower suspension (12); a servo cylinder (121) for driving the positioning block (16) to slide is arranged on the lower suspension (12); an infrared signal transmitter (154) is arranged on the slider (15); an infrared signal receiver (221) is arranged on the touch block (22); and the servo cylinder (121), the infrared signal transmitter (154) and the infrared signal receiver (221) are all electrically connected to the control system (3).

7. The device for changing the rear suspension spring during simulation of actual vehicle operation according to claim 1, characterized in that: Side plates (155) are fixedly provided on both sides of the slider (15), and elastic pressure plates (156) are fixedly provided on the ends of the two side plates (155) close to each other. Slide grooves (122) for the elastic pressure plates (156) to be inserted are provided on both sides of the lower suspension (12) along the length direction of the lower suspension (12), and a plurality of rollers (157) are rotatably provided on the slider (15), and each of the rollers (157) is rollingly connected to the lower side wall of the lower suspension (12).

8. A simulation method for simulating a rear suspension spring change device during operation of a real vehicle based on any one of claims 1 to 7, characterized in that: The following steps are involved: S1, installing a suspension spring between the upper suspension (11) and the lower suspension (12) through a mounting mechanism on the upper suspension (11) and a connecting piece on the lower suspension (12); S2, start the control system (3), set the test parameters, including load range, load change frequency and test time; S3, starting the load simulation unit (2), applying a dynamic load to the lower suspension (12), and introducing a damping element (13) to buffer the movement of the lower suspension (12), thereby simulating the actual load condition of the suspension spring during operation of a real vehicle; S4. During the test, the load detection unit (4) is used to detect and feedback the actual load value borne by the suspension spring in real time, and the deformation detection unit (5) is used to accurately reflect the deformation of the suspension spring under different loads; S5, the data detected by the load detection unit (4) and the deformation detection unit (5) are transmitted to the control system (3), and the detected data are comprehensively analyzed and processed by the data processing module, thereby realizing the synchronous quantitative evaluation of the relationship between the deformation state of the spring and the load borne.

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