Automobile air suspension air pump motor and testing device thereof

Abstract

The invention discloses a testing device for an air pump motor, relates to the technical field of air pump motors, and aims to solve the technical problems that the existing scheme does not relate to vibration state monitoring in the operation of the motor and cannot simulate the actual working load. According to the technical scheme, the device is characterized by comprising a test bottom plate, one end of the surface of the test bottom plate is slidably connected with a detection bottom plate, the other end of the surface of the test bottom plate is slidably connected with a transplanting plate, a clamp seat is arranged between the detection bottom plate and the transplanting plate, a load detection mechanism is arranged on the detection bottom plate, and a transplanting mechanism is arranged on the transplanting plate. A jig mechanism is arranged on the side, away from the load detection mechanism, of the clamp base, the two opposite sides of the clamp base are each provided with a set of clamp mechanism, a vibration base is arranged at the top of the clamp base through four supporting rods, a vibration sensing mechanism is arranged at the top of the vibration base, and a power supply mechanism is arranged at the bottom of the vibration base. The invention aims to provide a testing device of an air pump motor.

Description

Technical Field

[0001] This invention relates to air pump motors, and more specifically, to an air pump motor for automotive air suspension and a testing device thereof. Background Technology

[0002] An air pump motor is a device that converts electrical energy into mechanical energy. Its main function is to drive an air pump to draw in, compress, and expel air. The working principle of an air pump motor is based on Faraday's law of electromagnetic induction, which states that when a conductor rotates in a magnetic field, an induced current is generated in the conductor.

[0003] The Chinese patent announcement CN117028236A discloses an integrated automatic testing method and fixture for an air pump mechanism. Its key technical features are: a worktable and a test fixture assembly and a laser marking assembly mounted on the worktable; the test fixture assembly includes a first upper computer assembly and a lower computer assembly connected to the first upper computer assembly; and a test assembly connected to the lower computer assembly is provided on the surface of the worktable.

[0004] It only focuses on electrical and pneumatic parameters, without addressing the monitoring of vibration during motor operation, which is crucial for motor life assessment; and it cannot simulate actual workload.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an air pump motor for automotive air suspension.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an automotive air suspension pump motor, comprising a motor body, characterized in that: a rotating cam is provided on the output shaft of the motor body, a positioning ring is provided on the rotating cam, a rotating bearing is rotatably connected to the positioning ring, a positioning rod is also inserted into the positioning ring, an energized base plate is provided on the motor body, and an energized socket is provided on the energized base plate.

[0008] By adopting the above technical solution, the rotary cam is directly integrated into the output shaft, simplifying the overall structure, and the rotary bearing is directly mounted on the positioning ring. This design integrates the cam's positioning support structure with the bearing housing, further optimizing space utilization and making the entire drive unit very compact. This is particularly important for the space-constrained suspension area of ​​a car chassis. The positioning rod facilitates cooperation with other components and overall axial positioning, while the power connector provides a clear and unified electrical connection point. During installation, simply connect the corresponding plug of the vehicle's wiring harness to this power connector; there is no need to find or connect wires separately on the motor housing, greatly simplifying the assembly and maintenance process.

[0009] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a testing device for air pump motors.

[0010] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a testing device for an air pump motor, characterized in that: it includes a testing base plate, one end of which is slidably connected to a detection base plate, and the other end of which is slidably connected to a transfer plate; a clamping seat is provided between the detection base plate and the transfer plate; a load detection mechanism for generating load force is provided on the detection base plate; a transfer mechanism for carrying material and moving the material is provided on the transfer plate; a fixture mechanism is provided on the clamping seat on the side away from the load detection mechanism; a set of clamping mechanisms for clamping material is provided on both opposite sides of the clamping seat; a vibration base is provided on the top of the clamping seat via four support rods; a vibration sensing mechanism for detecting material vibration is provided on the top of the vibration base; and a power supply mechanism for energizing the material is provided at the bottom of the vibration base.

[0011] By adopting the above technical solution: the test base plate provides corresponding support for the whole. In use, the material is first placed on the transplanting mechanism. By pushing the transplanting plate to slide, the material on the transplanting mechanism is displaced accordingly. The material comes into contact with the fixture mechanism. The clamping mechanisms on both sides clamp the material accordingly. The vibration sensing mechanism descends to clamp the top of the material accordingly. The test base plate slides accordingly, so that the load detection mechanism comes into contact with the fixture assembly. The power supply mechanism is responsible for powering the material to start working. At the same time, the load detection mechanism starts working to generate a load force on the material. The load detection assembly performs corresponding maximum load detection on the material. During the load detection process, the vibration sensing mechanism detects the vibration degree of the material.

[0012] The present invention is further configured such that: the load detection mechanism includes a load motor, a shaft clamp is provided on the output shaft of the load motor, a torque sensor is drivenly connected to the shaft clamp, a rotary spindle is drivenly connected to the torque sensor, a fixture shaft is bolted to the rotary spindle, the load motor is fixed to the detection base plate by load seat bolts, the torque sensor is fixed to the detection base plate by torque bracket bolts, and the rotary spindle is fixed to the detection base plate by rotary bracket bolts.

[0013] The present invention is further configured such that: a mounting plate is provided on the side of the load seat facing the torque sensor, and an encoder is provided on the mounting plate.

[0014] The present invention is further configured such that: the transplanting mechanism includes a transplanting cylinder disposed on the surface of the transplanting plate, and two bearing plates are disposed on the top of the transplanting cylinder, and bearing fixtures are disposed on both bearing plates.

[0015] The present invention is further configured such that: the fixture mechanism includes a fixture base plate bolted to one side of the fixture seat, a fixture side plate is provided on the fixture base plate, and the fixture mechanism also includes an eccentric block, which is drivenly connected to the fixture shaft.

[0016] The present invention is further configured such that: the clamping mechanism includes a clamping cylinder, a gripper arm is rotatably connected to the piston rod of the clamping cylinder, two movable connecting rods are rotatably connected to the gripper arm, the two movable connecting rods are arranged on opposite sides of the gripper arm, a support block is fixedly connected to one end of the two movable connecting rods, the support block is arranged on the surface of the clamping cylinder, and the clamping cylinder is fixed to the clamping seat by clamping seat bolts.

[0017] The present invention is further configured such that: the vibration sensing mechanism includes a lifting cylinder, a gripper plate is provided on the lifting cylinder, a sensing cylinder is connected to the gripper plate, two grippers are provided on the sensing cylinder, a connecting block is provided between the two grippers, a vibration sensor is provided on the top of the connecting block, a magnet is provided on the bottom of the connecting block, and the lifting cylinder is fixed to the vibration base by lifting bracket bolts.

[0018] The present invention is further configured such that: the power supply mechanism includes a power supply cylinder, an adjustment plate is bolted to the power supply cylinder, a power supply mounting seat is provided on the side of the adjustment plate facing the side plate of the fixture, a plurality of power supply plugs are provided on the power supply mounting seat, a power supply groove for inserting the power supply plugs is provided on the side plate of the fixture, and the power supply cylinder is fixed to the vibration base by the power supply seat bolts.

[0019] The present invention is further configured such that: the bottom of the transplanting plate is provided with a ball-shaped buckle, and the surface of the test base plate is bolted with several pins that cooperate with the ball-shaped buckle.

[0020] The present invention has the following advantages: 1. The rotary cam is directly integrated on the motor output shaft, eliminating the need for additional connecting parts. The positioning ring also integrates the rotary bearing mounting position and the positioning rod, optimizing space utilization.

[0021] 2. The transplanting mechanism drives the material to make corresponding linear displacement through the transplanting plate.

[0022] 3. The clamping mechanism clamps the material on both sides accordingly.

[0023] 4. The vibration sensing mechanism descends as a whole to clamp the top of the material accordingly, and detects the vibration of the material during the load detection process.

[0024] 5. The load detection mechanism starts working and generates a load force on the material. The load detection component performs the corresponding maximum load detection on the workpiece being tested.

[0025] 6. The power supply mechanism can energize the materials. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of Example 1;

[0027] Figure 2 This is a three-dimensional structural diagram of Embodiment 1 installed on Embodiment 2;

[0028] Figure 3 This is a three-dimensional structural diagram of Example 2;

[0029] Figure 4 A three-dimensional structural schematic diagram of Embodiment 2 from another perspective;

[0030] Figure 5 This is a three-dimensional structural diagram of the load detection mechanism in Example 2;

[0031] Figure 6 This is a three-dimensional structural diagram of the transplanting mechanism in Example 2;

[0032] Figure 7 This is a three-dimensional structural diagram of the clamp base, clamp mechanism, vibration sensing mechanism, and power supply mechanism in Embodiment 2.

[0033] Figure 8 Example 2 Figure 6 A magnified view of part A in the diagram;

[0034] Figure 9 This is a rear view of the fixture base, fixture mechanism, vibration sensing mechanism, and power supply mechanism in this embodiment;

[0035] Figure 10 This is a three-dimensional structural diagram of the vibration base, vibration sensing mechanism, and power supply mechanism in Embodiment 2.

[0036] Figure Descriptions: 1. Motor body; 2. Rotary cam; 3. Positioning ring; 4. Rotary bearing; 5. Positioning rod; 6. Power-on base plate; 7. Power-on socket; 8. Test base plate; 9. Detection base plate; 10. Transplanting plate; 11. Fixture seat; 12. Support rod; 13. Vibration base; 14. Load motor; 15. Shaft clamp; 16. Torque sensor; 17. Rotary spindle; 18. Fixture shaft; 19. Load seat; 20. Torque bracket; 21. Rotary bracket; 22. Mounting plate; 23. Encoder; 24. Transplanting cylinder; 25. Bearing plate; 6. Supporting fixture; 27. Fixture base plate; 28. Fixture side plate; 29. ​​Eccentric block; 30. Clamping cylinder; 31. Gripper arm; 32. Movable connecting rod; 33. Support block; 34. Clamping seat; 35. Lifting cylinder; 36. Gripper plate; 37. Sensing cylinder; 38. Gripper; 39. Connecting block; 40. Vibration sensor; 41. Magnet; 42. Lifting bracket; 43. Electric power supply cylinder; 44. Adjusting plate; 45. Electric power supply mounting base; 46. Electric power supply plug; 47. Electric power supply slot; 48. Electric power supply base; 49. Ball-type snap fastener; 50. Pin. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0039] Example 1:

[0040] like Figure 1 As shown, an automotive air suspension pump motor includes a motor body 1, a rotary cam 2 on the output shaft of the motor body 1, a positioning ring 3 on the rotary cam 2, a rotary bearing 4 rotatably connected to the positioning ring 3, a positioning rod 5 inserted into the positioning ring 3, a power-conducting base plate 6 on the motor body 1, and a power-conducting socket 7 on the power-conducting base plate 6.

[0041] The rotary cam 2 is directly integrated into the output shaft, simplifying the overall structure, while the rotary bearing 4 is directly mounted on the locating ring 3. This design integrates the cam's positioning support structure with the bearing housing, further optimizing space utilization and making the entire drive unit very compact. This is especially important for the space-constrained suspension area of ​​a car chassis. The locating rod 5 facilitates cooperation with other components and overall axial positioning, while the power connector 7 provides a clear and unified electrical connection point. During installation, simply connect the corresponding plug of the vehicle's wiring harness to this power connector 7; there is no need to search for or connect wires separately on the motor housing, greatly simplifying the assembly and maintenance process.

[0042] Example 2:

[0043] like Figures 3 to 4 As shown, a testing device for an air pump motor includes a test base plate 8. One end of the test base plate 8 is slidably connected to a detection base plate 9, and the other end is slidably connected to a transfer plate 10. A clamp seat 11 is provided between the detection base plate 9 and the transfer plate 10. A load detection mechanism that generates load force is provided on the detection base plate 9. A transfer mechanism that carries material and moves the material is provided on the transfer plate 10. A fixture mechanism is provided on the side of the clamp seat 11 away from the load detection mechanism. A set of clamping mechanisms for clamping material is provided on both opposite sides of the clamp seat 11. A vibration base 13 is provided on the top of the clamp seat 11 through four support rods 12. A vibration sensing mechanism for detecting material vibration is provided on the top of the vibration base 13. A power supply mechanism for energizing the material is provided at the bottom of the vibration base 13.

[0044] In this embodiment, the material is the air pump motor from Embodiment 1. The test base plate 8 provides support for the entire assembly. During use, the material is first placed on the transplanting mechanism. By pushing the transplanting plate 10 to slide, the material on the transplanting mechanism is displaced accordingly. The material comes into contact with the fixture mechanism, and the clamping mechanisms on both sides clamp the material accordingly. The vibration sensing mechanism descends to clamp the top of the material accordingly. The detection base plate 9 slides accordingly, so that the load detection mechanism comes into contact with the fixture assembly. The power supply mechanism is responsible for supplying power to the material, so that the material starts working. At the same time, the load detection mechanism starts working and generates a load force on the material. The load detection assembly performs the corresponding maximum load detection on the material. During the load detection process, the vibration sensing mechanism detects the vibration degree of the material.

[0045] like Figure 5 As shown, the load detection mechanism includes a load motor 14, a shaft clamp 15 is provided on the output shaft of the load motor 14, a torque sensor 16 is driven by the shaft clamp 15, a rotary spindle 17 is driven by the torque sensor 16, a fixture shaft 18 is bolted to the rotary spindle 17, the load motor 14 is bolted to the detection base plate 9 by a load seat 19, the torque sensor 16 is bolted to the detection base plate 9 by a torque bracket 20, and the rotary spindle 17 is bolted to the detection base plate 9 by a rotary bracket 21.

[0046] The load motor 14 is the power source. Its output shaft can drive the shaft clamp 15 to rotate accordingly. The shaft clamp 15 can guide the load accordingly. The shaft clamp 15 transmits power to the torque sensor 16 through the coupling. The torque sensor 16 then transmits power to the rotary spindle 17 through the coupling. The rotary spindle 17 transmits power to the fixture shaft 18. The fixture shaft 18 transmits power to the corresponding components on the fixture mechanism, generating a load force on the corresponding components. The torque sensor 16 can detect the torque generated by the load motor 14 during the power transmission process and can detect the maximum load force that the material can withstand.

[0047] like Figure 5 As shown, a mounting plate 22 is provided on the side of the load seat 19 facing the torque sensor 16, and an encoder 23 is provided on the mounting plate 22.

[0048] The encoder 23 converts mechanical displacement into electrical signals and detects the rotational displacement of the output shaft of the load motor 14 in real time, which can accurately control the speed of the load motor 14 and facilitate the measurement of the maximum load force that the material can withstand.

[0049] like Figure 6 As shown, the transplanting mechanism includes a transplanting cylinder 24 disposed on the surface of the transplanting plate 10. Two bearing plates 25 are disposed on the top of the transplanting cylinder 24, and bearing fixtures 26 are disposed on both bearing plates 25.

[0050] The transplanting cylinder 24 is a parallel finger cylinder. By controlling the two bearing plates 25 on its top to move away from or towards each other, it drives the bearing fixture 26 to move away from or towards each other, so that the bearing fixture 26 can adapt to materials of different sizes. The surface of the bearing fixture 26 is provided with corresponding inclined surfaces, which can provide load-bearing force for the placement of materials.

[0051] like Figure 7 As shown, the fixture mechanism includes a fixture base plate 27 bolted to one side of the fixture seat 11, a fixture side plate 28 provided on the fixture base plate 27, and an eccentric block 29 which is connected to the fixture shaft 18.

[0052] The fixture side plate 28 is first fitted onto the material and fixed. The material is then connected to the fixture base plate 27 through the fixture side plate 28. The material is inserted into the eccentric block 29. The eccentric block 29 can compensate for the eccentric force of the rotating shaft 18, protect the material from additional stress, ensure that the applied load can well simulate the actual working conditions, and guarantee the stability of the test process and the accuracy of the data. The rotation of the fixture shaft 18 can drive the eccentric block 29 to rotate accordingly, which can effectively apply the dynamic load required for the test to the material.

[0053] like Figure 7 and Figure 9As shown, the clamping mechanism includes a clamping cylinder 30, a gripper arm 31 rotatably connected to the piston rod of the clamping cylinder 30, two movable connecting rods 32 rotatably connected to the gripper arm 31, the two movable connecting rods 32 being arranged on opposite sides of the gripper arm 31, a support block 33 being fixedly connected to one end of the two movable connecting rods 32, the support block 33 being arranged on the surface of the clamping cylinder 30, and the clamping cylinder 30 being fixed to the clamping seat 11 by clamping seat 34 bolts.

[0054] When it is necessary to clamp the workpiece, the clamping cylinder 30 starts to work. Its piston rod extends under the action of air pressure. The linear motion of the piston rod is converted into the rotational motion of the gripper arm 31. The gripper arm 31 clamps the side of the material accordingly. When the gripper arm 31 rotates, the support block 33 provides a stable support point for the movable connecting rod 32. The movable connecting rod 32 provides a stable support point for the gripper arm 31, so that the gripper arm 31 will not deviate during the rotation process, which would prevent the material from being clamped accordingly.

[0055] like Figure 7 and Figure 10 As shown, the vibration sensing mechanism includes a lifting cylinder 35, a gripper plate 36 on the lifting cylinder 35, a sensing cylinder 37 connected to the gripper plate 36, two grippers 38 on the sensing cylinder 37, a connecting block 39 between the two grippers 38, a vibration sensor 40 on the top of the connecting block 39, and a magnet 41 on the bottom of the connecting block 39. The lifting cylinder 35 is fixed to the vibration base 13 by bolts through a lifting bracket 42.

[0056] The lifting cylinder 35 is a sliding cylinder, and the sensing cylinder 37 is a finger cylinder. The sensing cylinder 37 clamps the connecting block 39 through the gripper 38. When the material is directly below the gripper 38, the lifting cylinder 35 is activated, which drives the gripper plate 36 to descend accordingly, so that the magnet 41 contacts the top of the material, generating a magnetic force and clamping the top of the material. During the load detection process, the vibration sensor 40 detects the vibration intensity and vibration frequency of the material.

[0057] like Figures 7 to 10 As shown, the power supply mechanism includes a power supply cylinder 43, an adjustment plate 44 is bolted to the power supply cylinder 43, a power supply mounting base 45 is provided on the side of the adjustment plate 44 facing the side plate 28 of the fixture, a plurality of power supply plugs 46 are provided on the power supply mounting base 45, and a power supply slot 47 for inserting the power supply plugs 46 is provided on the side plate 28 of the fixture. The power supply cylinder 43 is bolted to the vibration base 13 through the power supply base 48.

[0058] The electric cylinder 43 is also a slide cylinder. The electric cylinder 43 pushes the adjustment plate 44 to make corresponding horizontal displacement, so that the power plug 46 is inserted into the corresponding power socket 7 of the material, and the material can start working when powered on.

[0059] like Figures 3 to 4 As shown, the bottom of the transplanting plate 10 is provided with a ball-shaped buckle 49, and the surface of the test base plate 8 is bolted with several pins 50 that cooperate with the ball-shaped buckle 49.

[0060] The specific number of ball-shaped buckles 49 and pins 50 are both two. The ball-shaped buckles 49 and pins 50 play corresponding positioning and limiting roles. When the material needs to be tested for load, the transfer plate 10 is pushed so that the ball-shaped buckles 49 and the pins 50 near the fixture seat 11 are engaged with each other. After the test is completed, the transfer plate 10 is pushed so that the ball-shaped buckles 49 and the pins 50 away from the fixture seat 11 are engaged with each other.

[0061] The specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An air pump motor for automotive air suspension, comprising a motor body (1), characterized in that: A rotary cam (2) is provided on the output shaft of the motor body (1), a positioning ring (3) is provided on the rotary cam (2), a rotary bearing (4) is rotatably connected to the positioning ring (3), a positioning rod (5) is also inserted on the positioning ring (3), a power-conducting base plate (6) is provided on the motor body (1), and a power-conducting socket (7) is provided on the power-conducting base plate (6).

2. A testing device for an air pump motor, characterized in that: The test base plate (8) is slidably connected to a detection base plate (9) at one end and to a transfer plate (10) at the other end. A fixture seat (11) is provided between the detection base plate (9) and the transfer plate (10). A load detection mechanism that generates load force is provided on the detection base plate (9). A transfer mechanism that carries the material and moves the material is provided on the transfer plate (10). A fixture mechanism is provided on the fixture seat (11) on the side away from the load detection mechanism. A set of fixture mechanisms for clamping the material is provided on both sides of the fixture seat (11). A vibration base (13) is provided on the top of the fixture seat (11) through four support rods (12). A vibration sensing mechanism for detecting the vibration of the material is provided on the top of the vibration base (13). A power supply mechanism for energizing the material is provided at the bottom of the vibration base (13).

3. The testing device for an air pump motor according to claim 2, characterized in that: The load detection mechanism includes a load motor (14), a shaft clamp (15) is provided on the output shaft of the load motor (14), a torque sensor (16) is connected to the shaft clamp (15), a rotary spindle (17) is connected to the torque sensor (16), a fixture shaft (18) is bolted to the rotary spindle (17), the load motor (14) is bolted to the detection base plate (9) by a load seat (19), the torque sensor (16) is bolted to the detection base plate (9) by a torque bracket (20), and the rotary spindle (17) is bolted to the detection base plate (9) by a rotary bracket (21).

4. The testing device for an air pump motor according to claim 3, characterized in that: The load seat (19) is provided with a mounting plate (22) on the side facing the torque sensor (16), and an encoder (23) is provided on the mounting plate (22).

5. The testing device for an air pump motor according to claim 4, characterized in that: The transplanting mechanism includes a transplanting cylinder (24) disposed on the surface of the transplanting plate (10). Two bearing plates (25) are disposed on the top of the transplanting cylinder (24), and bearing fixtures (26) are disposed on both bearing plates (25).

6. The testing device for an air pump motor according to claim 5, characterized in that: The fixture mechanism includes a fixture base plate (27) bolted to one side of the fixture seat (11), a fixture side plate (28) provided on the fixture base plate (27), and an eccentric block (29) which is connected to the fixture shaft (18).

7. The testing device for an air pump motor according to claim 6, characterized in that: The clamping mechanism includes a clamping cylinder (30), a gripper arm (31) is rotatably connected to the piston rod of the clamping cylinder (30), two movable connecting rods (32) are rotatably connected to the gripper arm (31), the two movable connecting rods (32) are arranged on opposite sides of the gripper arm (31), a support block (33) is fixedly connected to one end of the two movable connecting rods (32), the support block (33) is arranged on the surface of the clamping cylinder (30), and the clamping cylinder (30) is fixed to the clamping seat (11) by clamping seat (34) bolts.

8. The testing device for an air pump motor according to claim 7, characterized in that: The vibration sensing mechanism includes a lifting cylinder (35), a gripper plate (36) is provided on the lifting cylinder (35), a sensing cylinder (37) is connected to the gripper plate (36), two grippers (38) are provided on the sensing cylinder (37), a connecting block (39) is provided between the two grippers (38), a vibration sensor (40) is provided on the top of the connecting block (39), a magnet (41) is provided on the bottom of the connecting block (39), and the lifting cylinder (35) is fixed to the vibration base (13) by bolts through a lifting bracket (42).

9. A testing device for an air pump motor according to claim 8, characterized in that: The power supply mechanism includes a power supply cylinder (43), an adjustment plate (44) is bolted to the power supply cylinder (43), a power supply mounting seat (45) is provided on the side of the adjustment plate (44) facing the jig side plate (28), a plurality of power supply plugs (46) are provided on the power supply mounting seat (45), and a power supply groove (47) for inserting the power supply plugs (46) is provided on the jig side plate (28). The power supply cylinder (43) is bolted to the vibration base (13) by the power supply seat (48).

10. A testing device for an air pump motor according to claim 9, characterized in that: The bottom of the transplanting plate (10) is provided with a ball-shaped buckle (49), and the surface of the test base plate (8) is bolted with several pins (50) that cooperate with the ball-shaped buckle (49).

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