An automotive ball joint control arm hardness testing device and method

Abstract

The present invention belongs to the technical field of automotive ball joint control arms, and particularly relates to a hardness testing device and method for automotive ball joint control arms. It includes a lifting device fixedly connected inside a chassis, a workbench fixedly connected to the top of the lifting device, and an automotive ball joint control arm body placed on the top of the workbench; there is a clamping assembly between the top of the workbench and the inside of a chute, and pressure assemblies are movably connected between both ends of the clamping assembly and the top of the workbench. The automotive ball joint control arm body is located between the two pressure assemblies and inside the clamping assembly. The present invention fixes the device to be tested for hardness on the top of the workbench through the clamping assembly, and drives the pressure assemblies to expand, assisting the clamping assembly to firmly clamp components such as the automotive ball joint control arm body with irregular shapes and diverse sizes; at the same time, by continuously applying a clamping force through the clamping assembly, the pressure assemblies are driven to test the hardness of the inner angle expansion of the automotive ball joint control arm body.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive ball joint control arms, and particularly relates to a hardness testing device and method for automotive ball joint control arms. Background Technique

[0002] In automobile manufacturing, ball joint control arms are important components, and their quality is related to the performance, safety, and reliability of automobiles. Material hardness is a key indicator for measuring the quality of ball joint control arms, affecting the strength, wear resistance, and service life of the control arms. To ensure that the material hardness of ball joint control arms meets the design requirements, special testing devices are needed. Currently, the common hardness testing devices for automotive ball joint control arms mainly include bench-type, portable, and automated types.

[0003] The bench-type device has a support structure such as a base and a column. The test probe is connected through a transmission device, and is equipped with a control system, a display interface, and a fixing fixture. However, there are problems such as insufficient universality of the fixture, limited movement of the probe, large overall volume and lack of integration, and single loading force. The portable device is similar to a hand-held tool, with a handle, a telescopic and rotatable probe, a display screen, and operation buttons, and is powered by a battery. The automated device consists of a cabinet frame, with a test platform, a conveying system, a multi-axis motion system, and an intelligent control system, which can perform precise testing and connect to the quality management system. These devices have their own characteristics and also have limitations to varying degrees. In actual applications, they need to be selected and improved according to specific requirements to better meet the requirements of hardness testing for automotive ball joint control arms.

[0004] Currently, in the existing hardness testing devices for automotive ball joint control arms, when testing automotive ball joint control arms with a bench-type hardness testing device, since the fixing fixture of the bench-type hardness testing device is usually designed according to standard dimensions, it is difficult to fully adapt to components such as automotive ball joint control arms with irregular shapes and diverse sizes. When the size of the control arm exceeds the adjustment range of the fixture, or the shape is special and cannot be effectively fixed, it will affect the accuracy and repeatability of the test.

[0005] In view of this, we propose a hardness testing device and method for automotive ball joint control arms. Summary of the Invention

[0006] The purpose of the present invention is to provide a hardness testing device and method for automotive ball joint control arms, which can solve the problems raised in the above background technique.

[0007] To achieve the above purpose, one of the purposes of the present invention is to provide a hardness testing device for automotive ball joint control arms, including a chassis, wherein a lifting device is fixedly connected inside the chassis, a workbench is fixedly connected to the top of the lifting device, and an automotive ball joint control arm body is placed on the top of the workbench;

[0008] A chute is provided at the center of the upper surface of the workbench. A clamping component is movably connected inside the chute. Both ends of the clamping component are movably connected to pressure components on the upper surface of the workbench. The automotive ball joint control arm body is located between the two pressure components and inside the clamping component;

[0009] The clamping component is used to fix the center of the automotive ball joint control arm body. The clamping component continuously clamps and moves to test the hardness at the center of the automotive ball joint control arm body; while the clamping component is moving, it also drives the pressure component to expand. The pressure component is used to improve the clamping stability of the irregular parts of the automotive ball joint control arm body, and at the same time, under the continuous movement effect of the pressure component, test the hardness of the inner corner expansion of the automotive ball joint control arm body;

[0010] The pressure component also pushes the broken debris of the automotive ball joint control arm body that cannot withstand the hardness test. The continuous movement of the clamping component and the pressure component is used to clean the debris on the top of the workbench.

[0011] The clamping component includes a fixed block. The fixed block is fixedly connected to the top of the workbench near the center of the three grooves. A screw rod is movably connected inside the chute at the center of the workbench. A slider is threadedly connected to the outer wall of the screw rod. A clamping block is fixedly connected to the top of the slider.

[0012] The pressure component includes an expansion plate. A rotating block is fixedly connected to one end of the expansion plate close to the clamping block. A rotating rod is fixedly connected inside the rotating block. A rotating member is provided between the rotating rod and the slider.

[0013] The rotating member includes two toothed discs. The two toothed discs are meshed with each other. One of the toothed discs is coaxially connected to the rotating rod, and the other toothed disc is coaxially connected with a gear at the bottom.

[0014] Grooves are provided on both outer walls of the slider. Gears are provided inside the grooves of the slider. Rack bars are provided on both sides inside the chute of the workbench. The rack bars are slidably connected to the grooves, and the rack bars are meshed with the gears.

[0015] Rubber pads are provided on the mutually approaching surfaces of the fixed block and the clamping block and on the surfaces of the two expansion plates close to the fixed block. The rubber pads are used to reduce the wear on the automotive ball joint control arm body.

[0016] A collection box is movably connected to one end of the workbench. Two hooks are fixedly connected to the top of the collection box near one end. The hooks are inserted and matched with the inside of the workbench. A slope is fixedly connected to the inside of the workbench.

[0017] A second object of the present invention is to provide a method for operating the automotive ball joint control arm hardness testing device including any one of the above. The method steps are as follows:

[0018] S1. First, place the automotive ball joint control arm body on the top of the workbench, inside the clamping assembly. Start the motor to drive the clamping assembly to rotate and fix the automotive ball joint control arm body on the top of the workbench.

[0019] S2. Through the clamping and movement of the clamping assembly, drive the pressure assembly to rotate and clamp and fix the inner angle of the automotive ball joint control arm body, improving the stability before the hardness test of the automotive ball joint control arm body.

[0020] S3. When the clamping assembly continues to move, conduct a pressure test on the overall hardness of the automotive ball joint control arm body. At the same time, drive the pressure assembly to test the expansion hardness of the inner angle of the automotive ball joint control arm body, and use a sensor to calculate the time of the extrusion force on the automotive ball joint control arm body before it breaks, so as to obtain the test data of the hardness of the automotive ball joint control arm body.

[0021] S4. Through the continuous movement of the clamping assembly, drive the pressure assembly to push the debris of the broken automotive ball joint control arm body on the top of the workbench, and push the debris into the workbench and flow along the slope into the collection box to keep the top of the workbench clean.

[0022] The technical effects achieved by the present invention are as follows:

[0023] The present invention fixes the component to be tested for hardness on the top of the workbench through the clamping assembly. While the clamping assembly fixes the device, it drives the pressure assembly to expand, assisting the clamping assembly to firmly clamp components such as the automotive ball joint control arm body with irregular shapes and diverse sizes.

[0024] At the same time, as the clamping force of the clamping assembly gradually increases, the pressure assembly will correspondingly expand the inner angle of the automotive ball joint control arm body; during this process, the expansion hardness of the inner angle of the control arm body can be tested; by precisely monitoring the change of the clamping force and the expansion degree of the pressure assembly, hardness information about the automotive ball joint control arm body can be obtained.

[0025] When the automotive ball joint control arm body unfortunately breaks during the hardness test due to being unable to withstand the applied pressure, the generated debris will scatter on the top of the workbench; through the continuous movement of the clamping assembly, drive the pressure assembly to clean the debris on the top of the workbench; keep the clean appearance of the workbench and ensure that subsequent test work can be smoothly carried out in a clean and orderly environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2It is a schematic structural diagram of the workbench in the present invention;

[0028] Figure 3 It is a schematic structural diagram of the clamping state in the present invention;

[0029] Figure 4 It is a schematic structural diagram of the closed state in the present invention;

[0030] Figure 5 It is a schematic structural diagram of the two-way test in the present invention;

[0031] Figure 6 It is a schematic structural diagram of the clamping component in the present invention;

[0032] Figure 7 It is a schematic structural diagram of the pressure component in the present invention;

[0033] Figure 8 It is a schematic structural diagram of the rotating part in the present invention.

[0034] In the drawings, the list of components represented by each label is as follows:

[0035] 1. Chassis; 11. Lifting device; 12. Workbench; 13. Collection box; 130. Hook; 131. Ramp; 14. Clamping component; 140. Fixed block; 141. Screw; 142. Slide block; 143. Clamping block; 15. Pressure component; 150. Expanding plate; 151. Rotating block; 152. Rotating rod; 153. Rotating part; 1530. Tooth disc; 1531. Gear; 1532. Rack; 16. Rubber pad; 2. Automobile ball joint control arm body. Detailed implementation manners

[0036] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text only describes one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0037] As Figures 1-6 shown, an automobile ball joint control arm hardness testing device includes a chassis 1, a lifting device 11 is fixedly connected inside the chassis 1, a workbench 12 is fixedly connected to the top of the lifting device 11, and an automobile ball joint control arm body 2 is placed on the top of the workbench 12;

[0038] A chute is opened at the center of the upper surface of the workbench 12, a clamping component 14 is movably connected inside the chute, and pressure components 15 are movably connected to both ends of the clamping component 14 on the upper surface of the workbench 12. The automobile ball joint control arm body 2 is located between the two pressure components 15 and the clamping component 14;

[0039] The clamping assembly 14 is used to fix the center of the automotive ball joint control arm body 2. The clamping assembly 14 continuously clamps and moves to test the hardness at the center of the automotive ball joint control arm body 2. While moving, the clamping assembly 14 also drives the pressure assembly 15 to expand. The pressure assembly 15 is used to improve the stability of clamping the irregular parts of the automotive ball joint control arm body 2, and at the same time, under the continuous movement effect of the pressure assembly 15, test the expansion hardness of the inner angle of the automotive ball joint control arm body 2.

[0040] The pressure assembly 15 also pushes the broken debris of the automotive ball joint control arm body 2 that cannot withstand the hardness test. The continuous movement of the clamping assembly 14 and the pressure assembly 15 is used to clean the debris on the top of the workbench 12.

[0041] The improvement of this embodiment lies in: the clamping assembly 14 fixes the component to be tested for hardness on the top of the workbench 12. At the same time, the clamping assembly 14 also drives the pressure assembly 15 to expand, assisting the clamping assembly 14 to maintain the stability of clamping the automotive ball joint control arm body 2 with irregular shapes and various sizes; ensuring that during the test, the control arm body is always in a stable clamping state and will not loosen or shift due to the irregular shape or the diversity of sizes.

[0042] Meanwhile, the clamping assembly 14 continuously applies a clamping force to drive the pressure assembly 15 to expand the inner angle of the automotive ball joint control arm body 2, so as to test the expansion hardness of its inner angle; accurately monitor the change of the clamping force and the expansion degree of the pressure assembly 15 through the sensor to obtain detailed information about the hardness of the automotive ball joint control arm body 2.

[0043] When the automotive ball joint control arm body 2 breaks due to being unable to withstand the pressure during the test, the clamping assembly 14 continuously moves and drives the pressure assembly 15 to move; so that the pressure assembly 15 cleans the debris on the top of the workbench 12, effectively maintaining the cleanliness of the workbench 12 and providing a clean and orderly environment for subsequent test work.

[0044] The working principle of the sensor is as known to those skilled in the art. The change of the clamping force is monitored through a strain gauge or pressure sensor, which is usually installed at the contact part between the fixture and the control arm or at the key stress points; when the clamping force acts on the control arm, the sensitive element inside the sensor is deformed by the force, such as the change of the strain gauge resistance, and then the mechanical change is converted into an electrical signal, which is transmitted to the data acquisition system through a wire, processed and then transmitted to the control system or computer. Through algorithm and software analysis, the clamping force value and the change curve are displayed in real time to judge the clamping stability, and an alarm will be issued when it exceeds the set range.

[0045] For the monitoring of the degree of pressure expansion, a displacement sensor is usually used, such as a linear displacement sensor or a grating scale, which is installed on the pressure component 15 and works based on electromagnetic induction, capacitance change, resistance change, or optical principle, etc. It measures the displacement of the pressure component 15 to reflect the degree of expansion. The data is transmitted to the control system, and the expansion force can be adjusted in real time. The operator can also understand the changes through the display screen, providing an important parameter basis for the hardness test to ensure the reliability and accuracy of the test.

[0046] First, the specific structure of the clamping component 14 is disclosed. The clamping component 14 includes a fixed block 140. The fixed block 140 is fixedly connected to the top of the workbench 12 near the center of the three grooves. A screw rod 141 is movably connected inside the chute at the center of the workbench 12. A slider 142 is threadedly connected to the outer wall of the screw rod 141. A clamping block 143 is fixedly connected to the top of the slider 142.

[0047] Refer to Appendix Figure 3 Appendix Figure 4 And Appendix Figure 5 As shown, the output shaft of the motor drives the screw rod 141 to rotate. The screw rod 141 drives the slider 142 to move on the outer wall of the screw rod 141, so that the slider 142 drives the clamping block 143 to move. The part is fixed to the top of the workbench 12 between the clamping block 143 and the fixed block 140.

[0048] Furthermore, the specific structure of the pressure component 15 is disclosed. The pressure component 15 includes an expansion plate 150. One end of the expansion plate 150 close to the clamping block 143 is fixedly connected with a rotating block 151. A rotating rod 152 is fixedly connected inside the rotating block 151. A rotating part 153 is provided between the rotating rod 152 and the slider 142.

[0049] Refer to Appendix Figure 3 Appendix Figure 4 And Appendix Figure 6 As shown, the movement of the slider 142 drives the rotating part 153 to rotate. The rotating part 153 drives the rotating rod 152 to rotate inside the clamping block 143. The rotating rod 152 drives the rotating block 151 to rotate inside the clamping block 143, so that the rotating block 151 adjusts the expansion angle between the two expansion plates 150. By adjusting the angle between the two expansion plates 150, it is convenient to adapt to the inner angle of the automotive ball joint control arm body 2. Through the continuous expansion of the two expansion plates 150, they are propped against the inner angle of the automotive ball joint control arm body 2 to secondary stabilize the clamping and fixing of the automotive ball joint control arm body 2, ensuring that the automotive ball joint control arm body 2 is always in a stable clamping state during the test and will not loosen or shift due to irregular shape or dimensional diversity.

[0050] Moreover, after fixing the automotive ball joint control arm body 2 to the workbench 12, the center hardness of the automotive ball joint control arm body 2 is tested through the continuous clamping of the clamping block 143. At the same time, the movement of the clamping block 143 will drive the two expansion plates 150 to continue to expand, and the hardness tension of the inner angle of the automotive ball joint control arm body 2 is tested. By accurately monitoring the change of the clamping force and the expansion degree of the two expansion plates 150, hardness information about the automotive ball joint control arm body 2 can be obtained, simulating the force-bearing situation of the control arm during actual use, so as to obtain more accurate and reliable hardness test results;

[0051] The rotating member 153 includes two toothed discs 1530 which are meshed and connected with each other. One of the toothed discs 1530 is coaxially connected with the rotating rod 152, and a gear 1531 is coaxially connected to the bottom of the other toothed disc 1530; grooves are provided on the outer walls of both sides of the slider 142, and the gear 1531 is provided inside the groove of the slider 142. Rack bars 1532 are provided on both sides inside the chute of the workbench 12, and the rack bars 1532 are slidably connected with the groove and meshed with the gear 1531.

[0052] Refer to Appendix Figure 3 Appendix Figure 4 and Appendix Figure 7 As shown, the position of the gear 1531 is adjusted by moving the slider 142. When the gear 1531 moves, it is subjected to the meshing force of the rack bar 1532, driving the toothed disc 1530 coaxial with it to rotate. Through the meshing rotation of the two toothed discs 1530, the other toothed disc 1530 drives the rotating rod 152 to rotate, and the rotating rod 152 drives the rotating block 151 to rotate, so that the expansion angle between the two expansion plates 150 is adjusted by the two rotating blocks 151.

[0053] A rubber pad 16 is provided on the mutually approaching surfaces of the fixed block 140 and the clamping block 143 and on the surfaces of the two expansion plates 150 close to the fixed block 140. The rubber pad 16 is used to reduce the wear on the automotive ball joint control arm body 2;

[0054] Refer to Appendix Figure 2 Appendix Figure 5 As shown, the rubber pad 16 protects the contact parts between the clamping block 143, the fixed block 140, the two expansion plates 150 and the automotive ball joint control arm body 2; according to the characteristics of the rubber material, it has excellent elasticity; when the fixture contacts the automotive ball joint control arm body 2, the rubber pad 16 can deform according to the shape and force-bearing situation of the automotive ball joint control arm body 2, so as to closely fit the surface of the automotive ball joint control arm body 2; this kind of fitting can not only increase the contact area to make the clamping more stable, but also effectively disperse the clamping force and avoid damage to the surface of the automotive ball joint control arm body 2 caused by excessive local pressure;

[0055] Secondly, the rubber has good wear resistance. During the operation of multiple clamping and loosening, friction will occur between the fixture and the automotive ball joint control arm body 2. Without the protection of the rubber pad 16, the surface of the automotive ball joint control arm body 2 is easily worn. However, the rubber material can withstand this friction and reduce the wear degree of the surface of the automotive ball joint control arm body 2. Even after long-term use, the rubber pad 16 can maintain good performance and continuously provide protection for the automotive ball joint control arm body 2.

[0056] Considering that when the automotive ball joint control arm body 2 unfortunately breaks during the hardness test due to its inability to withstand the applied pressure, there will be remnants of the automotive ball joint control arm body 2 on the surface of the workbench 12. Therefore, a collection box 13 is movably connected to one end of the workbench 12. Two hooks 130 are fixedly connected to the top of the collection box 13 near one end. The hooks 130 are inserted and matched with the inside of the workbench 12. A ramp 131 is fixedly connected to the inside of the workbench 12.

[0057] Refer to the attached Figure 2 As shown, through the continuous movement of the clamping block 143, the two expanding plates 150 are continuously expanded and move on the top of the workbench 12, so that the expanding plates 150 push the debris on the top of the workbench 12 into the groove at the end of the workbench 12. After the debris enters the inside of the workbench 12, it slides along the inclined direction of the ramp 131 into the inside of the collection box 13. Among them, by moving the hooks 130 up and down inside the workbench 12, it is convenient to install and disassemble the collection box 13.

[0058] Based on the content provided in Embodiment 1, the purpose of this embodiment is to provide a method for a hardness testing device of an automotive ball joint control arm. The specific steps are as follows:

[0059] S1. First, place the automotive ball joint control arm body 2 on the top of the workbench 12, that is, between the clamping block 143 and the fixed block 140. At this time, start the motor, and the output shaft of the motor starts to rotate and drives the screw 141 to rotate synchronously. As the screw 141 rotates, the slider 142 starts to move smoothly on the outer wall of the screw 141 due to its threaded connection with the screw 141. During the movement, the slider 142 drives the clamping block 143 to move together, and the clamping block 143 gradually approaches the automotive ball joint control arm body 2. After the clamping block 143 contacts the automotive ball joint control arm body 2, continue to apply pressure until the automotive ball joint control arm body 2 is firmly fixed on the top of the workbench 12 and is located between the clamping block 143 and the fixed block 140 to ensure that the control arm will not move easily during subsequent operations.

[0060] S2. Next, as the slider 142 moves, it drives the gear 1531 to move. Due to the meshing relationship between the gear 1531 and the rack 1532, the gear 1531 is subjected to the meshing force of the rack 1532 during movement; this meshing force causes the gear 1531 to rotate inside the groove of the slider 142; the rotation of the gear 1531 further drives one of the toothed discs 1530 to rotate; since the two toothed discs 1530 are meshed with each other, when one toothed disc 1530 rotates, the other toothed disc 1530 also rotates accordingly; in this way, the other toothed disc 1530 drives the rotating rod 152 to rotate, and the rotating rod 152 then drives the rotating block 151 to rotate; through the rotation of the rotating block 151, the expansion angle between the two expanding plates 150 is precisely adjusted;

[0061] S3. After the angle adjustment, the two expanding plates 150 can better adapt to the inner corner of the automotive ball joint control arm body 2; as the operation continues, the two expanding plates 150 continue to expand and gradually support against the inner corner of the automotive ball joint control arm body 2; this way of supporting against the inner corner provides secondary stability for the clamping and fixing of the automotive ball joint control arm body 2; the shape of the automotive ball joint control arm body 2 is often irregular and its dimensions are diverse. Through this secondary stable clamping, it can be ensured that during the testing process, the automotive ball joint control arm body 2 always remains in a stable state and will not loosen or shift due to its own irregular shape or diverse dimensions, laying a solid foundation for subsequent accurate testing;

[0062] S4. When the automotive ball joint control arm body 2 is firmly fixed on the workbench 12, the center hardness of the automotive ball joint control arm body 2 can be tested through the continuous clamping of the clamping block 143; at the same time, the movement of the clamping block 143 will drive the two expanding plates 150 to continue to expand; during the expansion process, the two expanding plates 150 test the hardness tension of the inner corner of the automotive ball joint control arm body 2; in this process, by precisely monitoring the change of the clamping force and the expansion degree of the two expanding plates 150, detailed hardness information about the automotive ball joint control arm body 2 can be obtained; this testing method can more realistically simulate the force-bearing situation of the control arm during actual use, thereby obtaining more accurate and reliable hardness test results, providing a strong basis for the quality assessment of the automotive ball joint control arm;

[0063] S5. As the clamping block 143 continues to move, the two expanding plates 150 also continue to expand and move on the top of the workbench 12; during the movement, the expanding plates 150 can push the debris on the top of the workbench 12 into the groove at the end of the workbench 12; when the debris enters the workbench 12, it will naturally slide along the inclined direction of the slope 131 into the collection box 13; such an operation can keep the appearance of the workbench 12 clean and avoid the interference of debris on subsequent testing work; ensure that subsequent testing work can be carried out smoothly in a clean and orderly environment, improving the efficiency and accuracy of the testing work.

[0064] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. An automotive ball joint control arm hardness testing device, comprising a chassis (1), wherein a lifting device (11) is fixedly connected inside the chassis (1), and a workbench (12) is fixedly connected to the top of the lifting device (11), and is characterized in that: The top of the workbench (12) is placed with the automotive ball joint control arm body (2); A chute is opened at the center of the upper surface of the workbench (12). A clamping component (14) is movably connected inside the chute. Both ends of the clamping component (14) are movably connected with pressure components (15) on the upper surface of the workbench (12). The automotive ball joint control arm body (2) is located between the two pressure components (15) and inside the clamping component (14); The clamping component (14) is used to fix the center of the automotive ball joint control arm body (2). The clamping component (14) continuously clamps and moves to test the hardness at the center of the automotive ball joint control arm body (2); while the clamping component (14) is moving, it also drives the pressure component (15) to expand. The pressure component (15) is used to improve the clamping stability of the irregular parts of the automotive ball joint control arm body (2), and at the same time, under the continuous movement effect of the pressure component (15), the internal angle expansion hardness of the automotive ball joint control arm body (2) is tested; The pressure component (15) also pushes the broken debris of the automotive ball joint control arm body (2) that cannot withstand the hardness test. The continuous movement of the clamping component (14) and the pressure component (15) is used to clean the debris on the top of the workbench (12); A screw rod (141) is movably connected inside the chute at the center of the workbench (12). A slider (142) is threadedly connected to the outer wall of the screw rod (141). A clamping block (143) is fixedly connected to the top of the slider (142); The pressure component (15) includes an expansion plate (150). One end of the expansion plate (150) close to the clamping block (143) is fixedly connected with a rotating block (151). A rotating rod (152) is fixedly connected inside the rotating block (151). A rotating member (153) is provided between the rotating rod (152) and the slider (142); The rotating member (153) includes two toothed discs (1530). The two toothed discs (1530) are meshed with each other. One of the toothed discs (1530) is coaxially connected with the rotating rod (152), and the other toothed disc (1530) is coaxially connected with a gear (1531) at the bottom; Grooves are provided on both outer walls of the slider (142). Gears (1531) are provided inside the grooves of the slider (142). Rack bars (1532) are provided on both sides inside the chute of the workbench (12). The rack bars (1532) are slidably connected with the grooves, and the rack bars (1532) are meshed with the gears (1531).

2. The hardness testing device for an automotive ball joint control arm according to claim 1, wherein: The clamping component (14) includes a fixed block (140). The fixed block (140) is fixedly connected to the top of the workbench (12) near the center of the three grooves.

3. The hardness testing device for an automotive ball joint control arm according to claim 2, wherein: Rubber pads (16) are provided on the mutually approaching surfaces of the fixed block (140) and the clamping block (143) and on the surfaces of the two expansion plates (150) close to the fixed block (140). The rubber pads (16) are used to reduce the wear on the automotive ball joint control arm body (2).

4. The hardness testing device for an automotive ball joint control arm according to claim 1, characterized in that: One end of the workbench (12) is movably connected with a collection box (13). Two hooks (130) are fixedly connected to the top of the collection box (13) near one end. The hooks (130) are inserted and matched with the inside of the workbench (12). A slope (131) is fixedly connected to the inside of the workbench (12).

5. A method for operating an automotive ball joint control arm hardness testing device according to any one of claims 1-4, characterized in that, It includes the following method steps: S1. First, place the automotive ball joint control arm body (2) on the top of the workbench (12), inside the clamping assembly (14). Start the motor to drive the clamping assembly (14) to rotate and fix the automotive ball joint control arm body (2) on the top of the workbench (12). S2. Through the clamping and movement of the clamping assembly (14), drive the pressure assembly (15) to rotate to clamp and fix the inner angle of the automotive ball joint control arm body (2), improving the stability before the hardness test of the automotive ball joint control arm body (2). S3. When the clamping assembly (14) continues to move, conduct a pressure test on the overall hardness of the automotive ball joint control arm body (2), and at the same time drive the pressure assembly (15) to test the expansion hardness of the inner angle of the automotive ball joint control arm body (2). Use a sensor to calculate the time of the extrusion force on the automotive ball joint control arm body (2) before it breaks, so as to obtain the test data of the hardness of the automotive ball joint control arm body (2). S4. Through the continuous movement of the clamping assembly (14), drive the pressure assembly (15) to push the debris of the broken automotive ball joint control arm body (2) on the top of the workbench (12), and push the debris into the workbench (12) and flow along the slope (131) into the collection box (13) to keep the cleanliness of the top of the workbench (12).

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