A ball pin bending fatigue test device

Abstract

The application provides a ball pin bending fatigue test device and relates to the technical field of fatigue test devices.The ball pin bending fatigue test device comprises a ball pin body, a base, and a clamping mechanism and a supporting mechanism.The clamping mechanism and the supporting mechanism are cooperatively designed to realize the circumferential multi-point stable clamping of the ball pin.The clamping structure can be self-adaptively attached to the curvature of the ball head of the ball pin, and the sliding friction between the ball pin and the clamping component is converted into rolling friction, which effectively avoids the scratching and abrasion of the surface of the ball pin during the test process, reduces the interference of the friction force on the loaded movement of the ball pin, ensures that the ball pin can adaptively rotate and displace during the bending fatigue test, and further has the adjustable structure design of the clamping mechanism and the supporting mechanism, so that the ball pin of different sizes and curvatures can be adapted without replacing any component, the universal adaptability of the device is greatly improved, the input cost of test consumables is reduced, and the use flexibility of the device is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of fatigue testing equipment technology, and in particular to a ball pin bending fatigue testing device. Background Technology

[0002] As a core component in mechanical transmission and connection, ball joints are widely used in many fields such as automotive steering systems and articulated parts of construction machinery. Their bending fatigue performance directly determines the operational stability and safety of the entire equipment. Therefore, ball joints must undergo professional bending fatigue testing before leaving the factory. Currently, various ball joint bending fatigue testing devices are in use in the industry. These devices generally include core components such as a base and clamping structure, which can realize the basic clamping of the ball joint and apply periodic bending loads to the ball joint in conjunction with external loading equipment to simulate the actual working conditions of the ball joint to complete the fatigue performance test. Overall, they can meet the basic testing requirements of ball joint bending fatigue testing and are indispensable equipment in the ball joint performance testing process.

[0003] Existing ball pin bending fatigue testing devices struggle to meet the demands of high-precision, multi-specification testing in practical applications. The clamping mechanisms are mostly rigid structures with fixed specifications, only suitable for ball pin heads of a single size. Frequent replacement of clamping components is necessary for ball pins of different sizes and curvatures, increasing material costs and significantly extending pre-test setup time. Furthermore, traditional clamping structures often involve hard contact with the ball pin head via sliding friction, easily causing scratches and wear on the ball head surface during testing. The high friction also interferes with the ball pin's adaptive rotation and displacement, leading to data deviations. After clamping, the devices generally lack precise perpendicularity detection and calibration structures, making it impossible to directly assess the ball pin's tilt after installation. The torque force deviation caused by unilateral ball pin offset directly affects test accuracy, and manual calibration is difficult and inefficient. Summary of the Invention

[0004] This invention solves the problems mentioned in the background art by automatically adjusting the clamping angle to clamp ball pins of different sizes and automatically detecting the perpendicularity.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a ball pin bending fatigue testing device, including a ball pin body and a base, wherein a placement groove for placing the ball pin is provided at the center of the base, and a movable groove is provided on the side of the placement groove, wherein there are multiple movable grooves arranged in a circle around the axis of the placement groove, and the movable grooves are interconnected with the placement groove. A clamping mechanism is included inside the movable groove. There are multiple clamping mechanisms arranged in a circle around the axis of the placement groove. The clamping mechanism includes a connecting plate, and a ball is rotatably connected inside the connecting plate. The ball is attached to the outer surface of the ball head part of the ball pin body. The support mechanism includes a bonding plate that surrounds the surface of the ball head and the ball rod connection part of the ball pin body. There are multiple support mechanisms arranged circumferentially around the center of the placement groove.

[0006] Preferably, the bottom of the placement groove is provided with a circular groove, the top end of the ball pin body is slidably connected to the inside of the circular groove, and the side wall of the top end of the placement groove is provided with a sliding groove. There are multiple sliding grooves arranged in a circle around the axis of the placement groove.

[0007] Preferably, a movable plate is slidably connected inside the movable groove, a limit rod is inserted inside the movable plate, the two ends of the limit rod are fixedly connected to the side wall of the placement groove, a hydraulic rod is fixedly connected to the side wall of the movable plate, a spring rod is rotatably connected to the side of the movable plate away from the hydraulic rod, a rotating shaft is rotatably connected to the side of the spring rod away from the movable plate, and a connecting plate is rotatably connected to the surface of the rotating shaft.

[0008] Preferably, a connecting post is fixedly connected to the upper surface of the movable plate, a slider is fixedly connected to the upper end of the connecting post, a horizontal groove is formed inside the slider, a locking rod is slidably connected inside the horizontal groove, the bonding plate is fixedly connected to the end of the locking rod away from the bottom of the horizontal groove, a pressure switch is fixedly connected to the center position of the surface of the bonding plate, an indicator light is fixedly connected to the side wall of the bonding plate, a locking hole is formed on the upper surface of the slider, and a positioning pin is inserted into the locking hole.

[0009] Preferably, a through hole is provided between the movable groove and the sliding groove, and a through groove is provided between the movable groove and the placement groove.

[0010] Preferably, the hydraulic rod is a telescopic rod, and a hydraulic pump is connected to the end of the hydraulic rod away from the movable plate.

[0011] Preferably, there are three connecting plates, which are connected in pairs by rotating shafts, and the diameter of the ball bearings inside the connecting plates is greater than the width of the connecting plates.

[0012] Preferably, the top of the locking rod has a slot, and the positioning pin is inserted into the slot through the locking hole.

[0013] Preferably, the bonding plate is arc-shaped, and the center of the arc of the bonding plate is the axis of the placement groove.

[0014] Preferably, one end of the pressure switch is connected to a power source, and the other end is connected to an indicator light via a wire.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. In this invention, the circumferential multi-point stable clamping of the ball pin is achieved through the coordinated design of the clamping and support mechanisms. The clamping structure can adaptively fit according to the curvature of the ball pin head, and at the same time, the sliding friction between the ball pin and the clamping component is converted into rolling friction. This effectively avoids scratching and wear on the surface of the ball pin during the test, and reduces the interference of friction on the ball pin's loaded movement, ensuring that the ball pin can make adaptive rotation and displacement during the bending fatigue test. In addition, both the clamping and support mechanisms adopt an adjustable structure design, which can adapt to ball pins of different sizes and curvatures without replacing any parts. This greatly improves the universality and adaptability of the device, reduces the cost of test consumables, and eliminates the need for frequent replacement of parts, significantly improving the flexibility of the device.

[0016] 2. In this invention, the structural design of a support mechanism combined with pressure sensing and light indication enables visualized detection and precise calibration of the verticality of the ball pin installation. Inspectors can intuitively determine the direction of ball pin misalignment and quickly make fine adjustments, effectively avoiding torque force deviation caused by ball pin misalignment. This ensures the accuracy and reliability of bending fatigue test data from the source. During the test, the support mechanism continuously provides circumferential support to the ball pin, preventing additional misalignment under load and further improving test stability. The overall operation of the device is simple, with smooth transmission of each mechanism. Disassembly and resetting after the test are convenient, reducing the workload of operators. The modular structural design also makes daily maintenance and component repair more convenient, adapting to the needs of industrial-scale ball pin bending fatigue testing. Attached Figure Description

[0017] Figure 1 This invention provides a frontal three-dimensional structural diagram of the overall equipment in a ball pin bending fatigue testing device. Figure 2 This invention provides a front sectional view of the overall structure of a ball pin bending fatigue testing device. Figure 3 This invention provides a front sectional view of the base in a ball pin bending fatigue testing device. Figure 4 This invention provides a frontal three-dimensional structural diagram of the ball pin body and clamping device in a ball pin bending fatigue testing device. Figure 5 This invention provides a front sectional view of the ball pin body and the snap-fit ​​device in a ball pin bending fatigue testing device. Figure 6 This invention provides a frontal three-dimensional structural diagram of the connecting plate in a ball pin bending fatigue testing device. Figure 7This invention provides a front sectional view of the clamping mechanism in a ball pin bending fatigue testing device. Figure 8 This invention provides a front sectional view of the support mechanism in a ball pin bending fatigue testing device.

[0018] Legend: 100, Base; 101, Placement slot; 102, Circular slot; 103, Movable slot; 104, Slide groove; 200, Clamping mechanism; 201, Movable plate; 202, Limiting rod; 203, Hydraulic rod; 204, Spring rod; 205, Rotating shaft; 206, Connecting plate; 207, Ball bearing; 300, Support mechanism; 301, Connecting column; 302, Slider; 303, Horizontal slot; 304, Snap-fit ​​rod; 305, Adhesive plate; 306, Pressure switch; 307, Indicator light; 308, Snap-fit ​​hole; 309, Positioning pin; 400, Ball pin body. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0021] like Figure 1 and Figure 3 As shown, a ball pin bending fatigue testing device includes a ball pin body 400 and a base 100. The base 100 has a placement groove 101 for placing the ball pin 400 at its center. The side of the placement groove 101 has a movable groove 103. There are multiple movable grooves 103, which are arranged in a circle around the axis of the placement groove 101 and are interconnected with the placement groove 101. A clamping mechanism 200 is included inside the movable groove 103 to clamp and fix the ball head part of the ball pin placed in the placement groove 101. like Figure 2 and Figure 3A circular groove 102 is provided at the bottom of the placement groove 101. The curvature of the circular groove 102 is adapted to the curvature of the ball head tip of the ball pin body 400. The top of the ball pin body 400 is slidably connected to the inside of the circular groove 102. The arc-shaped circular groove 102 can effectively avoid hard contact wear between the ball head tip and the base 100 during the test, and at the same time provide bottom positioning support for the ball pin and limit the radial displacement of the bottom of the ball pin. A sliding groove 104 is provided inside the side wall at the top of the placement groove 101. There are multiple sliding grooves 104, which are arranged in a circle around the axis of the placement groove 101. A through hole is provided between the movable groove 103 and the sliding groove 104, and a through groove is provided between the movable groove 103 and the placement groove 101.

[0022] Furthermore, to improve the clamping stability of the ball pin during the test and to accommodate ball heads of different sizes and specifications, a clamping mechanism 200 is provided inside the movable groove 103 to adaptively clamp the ball head portion of the ball pin body 400. Figure 4 As shown, the number of clamping mechanisms 200 is the same as the number of movable slots 103, and they are evenly arranged in a circle around the axis of the placement slot 101, as shown. Figure 5 As shown, the clamping mechanism 200 includes a connecting plate 206, which is made of wear-resistant alloy. Its movable end extends into the interior of the placement groove 101. A ball bearing 207 is rotatably connected inside the connecting plate 206. There are three connecting plates 206, which are hinged in pairs through a rotating shaft 205. They can rotate adaptively according to the arc curvature of the ball head. The diameter of the ball bearing 207 inside the connecting plate 206 is larger than the width of the connecting plate 206, ensuring that the ball bearing 207 can effectively contact the outer surface of the ball head of the ball pin. The ball bearing 207 is made of high-hardness wear-resistant alloy steel and fits against the outer surface of the ball head of the ball pin body 400 to achieve rolling contact during the clamping process.

[0023] like Figures 6-7 As shown, there are multiple clamping mechanisms 200 arranged in a circle around the axis of the placement groove 101. Each clamping mechanism 200 includes a connecting plate 206 located inside the placement groove 101. A ball bearing 207 is rotatably connected inside the connecting plate 206. There are three connecting plates 206, which are connected in pairs by a rotating shaft 205. The diameter of the ball bearing 207 inside the connecting plate 206 is larger than the width of the connecting plate 206. The ball bearing 207 is attached to the outer surface of the ball head of the ball pin body 400. like Figure 7As shown, a movable plate 201 is slidably connected inside the movable groove 103. A limit rod 202 is inserted inside the movable plate 201. Both ends of the limit rod 202 are fixedly connected to the side wall of the placement groove 101. A hydraulic rod 203 is fixedly connected to the side wall of the movable plate 201. The hydraulic rod 203 is inserted in the through groove between the movable groove 103 and the placement groove 101. The hydraulic rod 203 is a telescopic rod. A hydraulic pump is connected to the end of the hydraulic rod 203 away from the movable plate 201. When the hydraulic pump is started, it drives the hydraulic rod 203 to move to the outside of the movable groove 103. At this time, the movable plate 201 moves along the surface of the limit rod 202 towards the axis of the placement groove 101. like Figure 7 As shown, a spring rod 204 is rotatably connected to the side of the movable plate 201 away from the hydraulic rod 203. A rotating shaft 205 is rotatably connected to the side of the spring rod 204 away from the movable plate 201. A connecting plate 206 is rotatably connected to the surface of the rotating shaft 205. When the movable plate 201 moves toward the center of the placement groove 101, the spring rod 204 drives the movable plate 201 to contact the ball head through the rotating shaft 205. When the movable plate 201 contacts the ball head, under pressure, multiple movable plates 201 rotate relative to each other, causing the ball 207 to contact the surface of the ball head. Since there are multiple clamping mechanisms 200, they surround the ball head. The ball head is surrounded by a clamping mechanism 200, which can clamp the ball head from all sides. At the same time, when the ball pin rotates or shifts during the bending fatigue test, the sliding friction between the ball head and the ball bearing 207 is converted into rolling friction. This reduces the interference of friction on the test, improves the movement flexibility of the ball pin during the test, and avoids scratch damage to the surface of the ball head caused by clamping. In addition, through the adaptive clamping method that fits against the surface of the ball head, ball heads of different sizes and curvatures can be clamped and surrounded without changing the clamping parts, which greatly expands the application range of the test device and reduces the test cost.

[0024] It should be noted that the verticality of the ball pin during bending fatigue testing directly affects the test results. If the ball pin is offset to one side, it will cause torque force offset, resulting in distorted test data. To address this issue, the present invention provides a support mechanism 300 around the placement groove 101 that is linked to the clamping mechanism 200. While providing circumferential support to the ball pin, it also enables visual detection and precise calibration of the verticality of the ball pin body 400. like Figure 8 As shown, the support mechanism 300 includes a bonding plate 305, which is arc-shaped and the center of the arc of the bonding plate 305 is the axis of the placement groove 101. The bonding plate 305 surrounds the surface of the ball head and the ball pin rod connection part of the ball pin body 400. There are multiple support mechanisms 300, which are arranged in a circle around the axis of the placement groove 101. The arc-shaped bonding plate 305 can be tightly bonded to the outer surface of the ball pin body 400 and clamp and support the ball pin body 400 from all sides. like Figure 2 and Figure 8 As shown, a connecting post 301 is fixedly connected to the upper surface of the movable plate 201. A slider 302 is fixedly connected to the upper end of the connecting post 301. A horizontal groove 303 is opened inside the slider 302. A locking rod 304 is slidably connected inside the horizontal groove 303. A bonding plate 305 is fixedly connected to the end of the locking rod 304 away from the bottom of the horizontal groove 303. A pressure switch 306 is fixedly connected to the center of the surface of the bonding plate 305. An indicator light 307 is fixedly connected to the side wall of the bonding plate 305. One end of the pressure switch 306 is connected to the power supply, and the other end is connected to the indicator light 307 through a wire. When the bonding plate 305 is in contact with the ball pin body 400, the pressure switch 306 is pressed simultaneously, and the indicator light 307 lights up simultaneously. When all the indicator lights 307 around the ball pin body 400 are lit, the ball pin body 400 is in a vertical state. When the indicator light 307 on one side is not lit, the offset on that side needs to be finely adjusted. like Figure 8 As shown, the upper surface of the slider 302 is provided with a snap-fit ​​hole 308, and the top end of the snap-fit ​​rod 304 is provided with a slot. The positioning pin 309 is inserted into the inside of the slot through the snap-fit ​​hole 308, and the snap-fit ​​rod 304 is fixed inside the slide groove 104. The positioning pin 309 is inserted into the snap-fit ​​hole 308, and there are multiple snap-fit ​​holes 308. By inserting into different snap-fit ​​holes 308, it is possible to clamp ball pin bodies 400 of different sizes. Furthermore, with the support mechanism 300 clamping and supporting the ball pin body from all sides, the inspectors can directly observe the verticality of the ball pin body 400 installation.

[0025] Working principle: The ball pin body 400 is placed into the placement groove 101 in the center of the base 100 with the ball head end facing down, so that the top of the ball head slides into the circular groove 102 at the bottom of the placement groove 101. The circular groove 102 provides bottom positioning support for the ball pin body 400, which not only avoids wear caused by hard contact between the ball head and the base 100, but also restricts the radial displacement of the bottom of the ball pin, thus completing the initial placement of the ball pin.

[0026] Start the hydraulic pump connected to the hydraulic rod 203. The hydraulic rod 203 retracts to the outside of the movable groove 103, causing the movable plate 201 in the movable groove 103 to slide smoothly along the limit rod 202 towards the axis of the placement groove 101. The movable plate 201 pushes the spring rod 204, and the spring rod 204 then drives the connecting plate 206 to approach the ball head of the ball pin body 400 through the rotating shaft 205. The three connecting plates 206, which are hinged in pairs through the rotating shaft 205, rotate adaptively with the arc curvature of the ball head until the ball 207 inside the connecting plate 206 is tightly attached to the outer surface of the ball head.

[0027] The circumferentially distributed multiple clamping mechanisms 200 achieve multi-point circumferential clamping of the ball head. The spring rod 204 plays an elastic buffering role to avoid excessive clamping force causing plastic deformation of the ball head. The ball 207 converts the sliding friction of the ball pin rotation in the test into rolling friction, which reduces the interference of friction on the test and prevents the ball head surface from being scratched and damaged. Moreover, this adaptive clamping structure can adapt to ball pins and ball heads of different sizes and curvatures without replacing any parts.

[0028] When the movable plate 201 of the clamping mechanism 200 slides, the connecting column 301 on its upper surface synchronously drives the slider 302 to slide along the slide groove 104, realizing the synchronous linkage between the support mechanism 300 and the clamping mechanism 200, ensuring that the positions of the two are always matched. According to the diameter of the ball head of the ball pin body 400 and the ball pin rod connection part, the locking rod 304 is pushed to slide along the transverse groove 303 in the slider 302, so that the arc-shaped fitting plate 305 is close to the ball pin connection part. Then, the positioning pin 309 is passed through the locking hole 308 and inserted into the slot at the top of the locking rod 304 to complete the position fixation of the locking rod 304.

[0029] When the bonding plate 305 contacts the surface of the ball pin body 400 and generates a preset pressure, the pressure switch 306 on the surface of the bonding plate 305 is triggered and the circuit is closed. The indicator light 307 on the side wall of the bonding plate 305 lights up simultaneously. If the ball pin body 400 is installed at an angle, the pressure switch 306 on the corresponding side is not triggered and the indicator light 307 remains off. The tester can visually judge the direction of the angle based on the lighting of the indicator light 307 and make fine adjustments to the ball pin until all the indicator lights 307 in the circumference are lit, confirming that the ball pin body 400 is in a vertical installation state. This avoids the torque force deviation caused by the angle affecting the test accuracy. By changing the insertion position of the positioning pin 309 in different snap-fit ​​holes 308, the distance between the bonding plate 305 and the axis of the placement groove 101 can be adjusted to adapt to ball pin connection parts of different sizes.

[0030] After the ball pin body 400 is clamped and its perpendicularity is calibrated, the external bending fatigue loading device applies a periodic bending load to the free end of the ball pin rod to simulate the actual working conditions of the ball pin. During the test, the ball 207 ensures that the ball pin body 400 can make adaptive rotation and displacement when it is subjected to bending load, without any jamming.

[0031] After the test is completed, first turn off the external loading equipment, then turn off the hydraulic pump. The hydraulic rod 203 extends into the movable groove 103, driving the movable plate 201 to slide outward along the limit rod 202 into the movable groove 103. The spring rod 204, the rotating shaft 205, and the connecting plate 206 are simultaneously reset. The ball 207 separates from the ball head, and the clamping mechanism 200 is released from clamping. Then, the positioning pin 309 is pulled out, and the locking rod 304 is pushed to slide outward along the transverse groove 303. The bonding plate 305 separates from the ball pin body 400, and the support mechanism 300 is released from support. Finally, the ball pin body 400 is taken out from the placement groove 101, completing the disassembly. After cleaning all parts, the clamping mechanism 200 and the support mechanism 300 are reset for subsequent testing.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A ball pin bending fatigue testing device, comprising a ball pin body (400), characterized in that: It also includes a base (100), the center of which is provided with a placement groove (101) for placing a ball pin (400), and the side of the placement groove (101) is provided with a movable groove (103). There are multiple movable grooves (103), which are arranged in a circle around the axis of the placement groove (101), and the movable grooves (103) are connected to the placement grooves (101). A clamping mechanism (200) is contained inside the movable groove (103). There are multiple clamping mechanisms (200) arranged in a circle around the axis of the placement groove (101). Each clamping mechanism (200) includes a connecting plate (206). A ball bearing (207) is rotatably connected inside the connecting plate (206). The ball bearing (207) is attached to the outer surface of the ball head of the ball pin body (400). Support mechanism (300), the support mechanism (300) includes a bonding plate (305), the bonding plate (305) surrounds the surface of the ball head and the ball pin rod connection part of the ball pin body (400), and there are multiple support mechanisms (300) arranged in a circle around the axis of the placement groove (101).

2. The ball pin bending fatigue testing device according to claim 1, characterized in that: The bottom of the placement groove (101) is provided with a circular groove (102), and the top of the ball pin body (400) is slidably connected to the inside of the circular groove (102). The side wall of the top of the placement groove (101) is provided with a sliding groove (104). There are multiple sliding grooves (104), which are arranged in a circle around the axis of the placement groove (101).

3. The ball pin bending fatigue testing device according to claim 1, characterized in that: A movable plate (201) is slidably connected inside the movable groove (103). A limiting rod (202) is inserted inside the movable plate (201). The two ends of the limiting rod (202) are fixedly connected to the side wall of the placement groove (101). A hydraulic rod (203) is fixedly connected to the side wall of the movable plate (201). A spring rod (204) is rotatably connected to the side of the movable plate (201) away from the hydraulic rod (203). A rotating shaft (205) is rotatably connected to the side of the spring rod (204) away from the movable plate (201). A connecting plate (206) is rotatably connected to the surface of the rotating shaft (205).

4. The ball pin bending fatigue testing device according to claim 3, characterized in that: A connecting post (301) is fixedly connected to the upper surface of the movable plate (201). A slider (302) is fixedly connected to the upper end of the connecting post (301). A transverse groove (303) is provided inside the slider (302). A snap-fit ​​rod (304) is slidably connected inside the transverse groove (303). A bonding plate (305) is fixedly connected to the end of the snap-fit ​​rod (304) away from the bottom of the transverse groove (303). A pressure switch (306) is fixedly connected to the center of the surface of the bonding plate (305). An indicator light (307) is fixedly connected to the side wall of the bonding plate (305). A snap-fit ​​hole (308) is provided on the upper surface of the slider (302). A positioning pin (309) is inserted into the snap-fit ​​hole (308).

5. The ball pin bending fatigue testing device according to claim 2, characterized in that: A through hole is provided between the movable groove (103) and the sliding groove (104), and a through groove is provided between the movable groove (103) and the placement groove (101).

6. The ball pin bending fatigue testing device according to claim 3, characterized in that: The hydraulic rod (203) is a telescopic rod, and a hydraulic pump is connected to the end of the hydraulic rod (203) away from the movable plate (201).

7. The ball pin bending fatigue testing device according to claim 3, characterized in that: There are three connecting plates (206), which are connected in pairs by a rotating shaft (205), and the diameter of the ball bearings (207) inside the connecting plate (206) is greater than the width of the connecting plate (206).

8. The ball pin bending fatigue testing device according to claim 4, characterized in that: The top of the locking rod 304 has a slot, and the positioning pin 309 is inserted into the slot through the locking hole 308.

9. The ball pin bending fatigue testing device according to claim 4, characterized in that: The bonding plate (305) is arc-shaped, and the center of the arc of the bonding plate (305) is the axis of the placement groove (101).

10. The ball pin bending fatigue testing device according to claim 4, characterized in that: One end of the pressure switch (306) is connected to a power source, and the other end is connected to an indicator light (307) via a wire.

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