Improved pneumatic running-in durability test fixture
By designing an improved pneumatic wear-in durability test fixture, the problem of hinge structure damage caused by loose plywood in the existing test machine is solved, and more efficient testing is achieved, suitable for the testing needs of the latest hinge products, improving testing efficiency and stability.
Patent Information
- Application Number
- CN202421532533.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-01
AI Technical Summary
During the long-term testing process of the existing hinge structure durability tester, the ply plate is prone to loosening, resulting in the hinge structure being uncoherent with the hinge of the rocker arm, causing damage. The test speed of the existing test fixture and the method, method and test angle of fixing the product cannot meet the testing requirements of the latest hinge products.
An improved pneumatic wear-in durability test fixture is designed, including a first bracket, a second bracket, an electric part and a pneumatic part installed on the workbench. The plate of the workpiece to be tested is fixed through the pneumatic part, and the second cylinder and the slide rail on the second bracket are used to achieve convenient fixing and release, and the rotation stability and driving force are improved through the synchronous rotation motor and rotating arm.
It improves the stability of the workpiece under test, prevents the plate from deviating, and improves the testing efficiency. It is suitable for the testing of heavy-duty hinges. It has a simple structure, is convenient to operate, is practical and can save production costs.
Smart Images
Figure CN222774261U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hinge production testing, in particular to an improved pneumatic running-in durability testing fixture. Background Art
[0002] During the design and production process of industrial products, performance testing of industrial products is an important indicator to measure their quality. In the production of industrial products, hinge structures are usually used. Since hinge structures will be damaged after long-term use, measuring the durability of hinge structures is an essential indicator. At the same time, when hinges are produced and shipped, due to structural characteristics such as burrs between the rotating parts, it is easy for hinges to make abnormal noises or friction sounds in the first few uses. Therefore, they need to be run-in before they can pass the factory.
[0003] At present, the durability test machine of hinge structure usually uses a clamp to clamp one swinging part fixed to the hinge structure to the bearing platform, and fixes the other swinging part fixed to the hinge structure to the rocker arm, and the hinge of the rocker arm is in line with the hinge of the rotating structure. During the long-term test, the clamp is easy to loosen, and then the swinging part fixed to the hinge structure and the bearing platform are easy to slide relative to each other, so that the hinge structure and the hinge of the rocker arm are not in line, and then the hinge structure is damaged.
[0004] Traditional running-in or durability test fixtures are widely used in products such as hinges and hinges. The test fixtures can simulate the use of hinges in real environments to ensure that each component of the product achieves the optimal performance and maximum service life when designed under specified conditions, providing people with more comfortable and safe products.
[0005] However, the test speed, product fixing mode, method and test angle of the existing test fixtures on the market can no longer meet the testing requirements of the latest hinge products. There is a special need to develop an improved pneumatic running-in durability test fixture. Utility Model Content
[0006] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.
[0007] The utility model provides an improved pneumatic running-in durability test fixture, comprising a first bracket, a second bracket, an electric part and a pneumatic part installed on a workbench, wherein the first bracket is fixedly connected to the workbench, and is used to fix a first plate of a workpiece to be measured, and to form a limit for the first plate; the second bracket is transmission-connected to a driving shaft of the electric part, and fixes the second plate of the workpiece to be measured through the pneumatic part, so that the electric part is operated, driving the second bracket to rotate a certain angle, and causing the second plate to rotate a certain angle relative to the first plate.
[0008] As a further solution of the utility model: the first bracket is provided with a positioning pin, the positioning pin is fixedly connected to the top of the first bracket and passes through the through hole of the first plate, so as to perform a limiting operation on the first plate.
[0009] As a further solution of the utility model: the pneumatic part is provided with a first cylinder and a fixed boss, the first cylinder is fixedly connected to the workbench, and the fixed boss is fixedly connected to the piston end of the first cylinder, so that the first plate is abutted and fixed under the drive of the first cylinder.
[0010] As a further solution of the utility model: the pneumatic part is also provided with a fixed card table, the second bracket is provided with two positioning blocks arranged opposite to each other, the positioning blocks are fixedly connected to the second bracket, and the two positioning blocks are respectively provided with slide grooves on opposite sides, and slide rails are respectively provided on both sides of the fixed card table corresponding to the positions of the slide grooves, and the slide rails and the slide grooves cooperate with each other to make the fixed card table slidably connected to the positioning blocks.
[0011] As a further solution of the utility model: the pneumatic part is also provided with a second cylinder, the second cylinder is fixedly connected to the second bracket, and the fixed clamping platform is fixedly connected to the piston end of the second cylinder, so that the second plate is clamped and fixed under the drive of the second cylinder.
[0012] As a further solution of the utility model: a limiting notch is provided at one end of the fixed clamping platform close to the second bracket. The fixed clamping platform is driven by the second cylinder to move toward the second plate so that the limiting notch is sleeved on the second plate, thereby clamping and fixing the second plate.
[0013] As a further solution of the utility model: it also includes a sensor component, which is provided with a first sensor and a first sensing sheet. The first sensing sheet is fixedly connected to the upper part of the second bracket, and the first sensor is fixedly connected to the electric part. Corresponding to the position of the first sensing sheet, the first sensor and the first sensing sheet cooperate with each other to sense the rotation state between the second plate and the first plate.
[0014] As a further solution of the utility model: the sensor assembly is also provided with a second sensor and a second sensing sheet, the second sensing sheet is fixedly connected to the lower part of the second bracket, and the second sensor is fixedly connected to the electric part. Corresponding to the position of the second sensing sheet, the second sensor and the second sensing sheet cooperate with each other to sense the rotation state between the second plate and the first plate.
[0015] As a further solution of the utility model: the electric part is provided with a first motor and a second motor which are respectively fixed to the workbench and located on both sides of the workpiece to be measured, the second bracket is provided with a first rotating arm, a second rotating arm and a bracket cross beam, the first rotating arm is transmission connected to the driving end of the first motor, the second rotating arm is transmission connected to the driving end of the second motor, and the two ends of the bracket cross beam are respectively fixed to the first rotating arm and the second rotating arm.
[0016] As a further solution of the utility model: it also includes an air supply device, a distribution box, a control switch and a control module. The air supply device is used to provide high-pressure airflow to the cylinder of the pneumatic part. The distribution box is electrically connected to the electric part, the sensor component, the control switch and the control module respectively. The control module is provided with a running-in test program and a durability test program.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] 1. The pneumatic part is set to fix the workpiece to be tested, thereby improving the stability of the workpiece to be tested and preventing the workpiece to be tested from deviating during the test.
[0019] 2. In particular, a second cylinder is arranged on the second bracket, and the cooperation of the slide rail and the slide groove is utilized, so that the fixed clamping table can conveniently fix or release the second plate, thereby improving the efficiency of taking and placing the measured workpiece.
[0020] 3. By setting up a first motor and a second motor that rotate synchronously, and using the first rotating arm and the second rotating arm to simultaneously drive the second plate of the workpiece to be tested, the rotation of the second plate can be made more stable, and the driving force for the second bracket can also be increased, so that heavy hinges can be tested.
[0021] Therefore, after the above improvements, the utility model can provide an improved pneumatic running-in durability test fixture, which can greatly improve the test efficiency of the workpiece being tested, and has a simple structure, convenient operation and strong practicality. It can also be used for testing products such as shafts and hinges with similar structures, thereby saving the production cost of the factory.
[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0024] Figure 1 It is a structural schematic diagram of the workbench and the movable frame of the utility model;
[0025] Figure 2 It is a structural schematic diagram of the second bracket of the utility model in the initial state;
[0026] Figure 3 It is a schematic diagram of the structure after the pneumatic part of the utility model fixes the workpiece to be measured;
[0027] Figure 4 It is a schematic diagram of the structure of the second bracket of the utility model after rotation;
[0028] Figure 5 It is a structural schematic diagram of the utility model in which the fixed clamping platform and the positioning block are separated.
[0029] The reference numerals and names in the figures are as follows:
[0030] 10 workbench; 11 first bracket; 12 positioning pin; 13 third bracket; 20 second bracket; 21 first rotating arm; 22 second rotating arm; 23 bracket crossbeam; 24 positioning block; 25 slide; 30 electric part; 31 first motor; 32 second motor; 40 pneumatic part; 41 first cylinder; 42 fixed boss; 43 second cylinder; 44 fixed clamping table; 45 slide rail; 46 limit notch; 50 sensor assembly; 51 first sensor; 52 first sensor sheet; 53 second sensor; 54 second sensor sheet; 60 workpiece to be measured; 61 first plate; 62 second plate; 70 movable rack; 71 distribution box; 72 control switch; 73 equipment parameter regulator. DETAILED DESCRIPTION
[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0032] See also Figures 1 to 5In an embodiment of the utility model, an improved pneumatic running-in and durability test fixture includes a first bracket 11, a second bracket 20, an electric part 30 and a pneumatic part 40 installed on a workbench 10. The first bracket 11 is fixedly connected to the workbench 10, and is used to fix the first plate 61 of the workpiece 60 to be measured, and to form a limit for the first plate 61; the second bracket 20 is transmission-connected to the driving shaft of the electric part 30, and fixes the second plate 62 of the workpiece 60 to be measured through the pneumatic part 40, so that the electric part 30 is operated, driving the second bracket 20 to rotate a certain angle, so that the second plate 62 rotates a certain angle relative to the first plate 61, and performs a running-in or durability test.
[0033] Specifically, in order to perform a running-in operation on the workpiece 60 to be tested, or to perform operations such as durability testing, it is necessary to design it in combination with the characteristics of the workpiece 60 itself. Usually, the first plate 61 and the second plate 62 of the workpiece 60 to be tested are connected in rotation by a pin structure, and are also limited by the elastic force of the torsion spring. Therefore, when performing a running-in or durability test on the workpiece 60 to be tested, the electric part 30 is required to drive the second bracket 20 to drive the second plate 62, so that the second plate 62 is continuously and repeatedly opened and closed, thereby achieving the effect of running-in, or achieving the effect of durability testing. The running-in operation is to perform a certain number of opening and closing operations on the newly produced workpiece 60 to generate friction between its rotating parts to achieve the running-in effect, thereby eliminating vibration or abnormal noise. The running-in operation can be performed by 10 opening and closing operations, or 100 opening and closing operations, or other running-in times required for production. The durability test can use a relatively large number of opening and closing operations, such as 9999 opening and closing operations. At the same time, in order to facilitate the movement of the test fixture during specific operations in the factory, the test fixture can also be installed on the movable rack 70.
[0034] Secondly, the test fixture may also include an air supply device, a distribution box 71, a control switch 72 and a control module. The air supply device may be an air pump or other equipment in existing products, which is used to provide high-pressure airflow to the cylinder of the pneumatic part 40. The distribution box 71 is electrically connected to the electric part 30, the sensor component 50, the control switch 72 and the control module respectively. The control module is provided with a running-in test program and a durability test program, which can adjust the corresponding running-in times, running-in speed and other parameters. Similarly, the corresponding durability test rotation times, rotation speed and other parameters can be adjusted. On the panel of the distribution box 71, an equipment parameter regulator 73 may also be provided to adjust the control module, such as adjusting the running-in test times or durability test times of each workpiece 60 being tested. In addition, a relay may also be installed in the distribution box 71 to perform corresponding forward, reverse or stop operations on the motor.
[0035] Again, the hinge pneumatic running-in durability test fixture of the utility model adopts a synchronous, dual-engine motor and a variable speed adjustment design as the concept to meet the customer's testing requirements at different speeds. It has a simple structure, is easy to operate and is highly practical, which greatly improves work efficiency. After adjusting the equipment operating parameters before the operation, the armrest hinge assembly (finished product) moved to 180° is placed in the equipment positioning pin 12; start the operation switch, and the product's plate is driven by the second bracket 20 to rotate a certain angle. Usually the rotation is 90 degrees. When the process of rotating from 180° to 90° and then rotating back to 180° is a test cycle. When the preset number of test cycles is completed, the fixture stops automatically, and the two plates of the workpiece 60 to be tested are kept at 180°. The fixed card table 44 on the second bracket 20 is also retracted to release the second plate 62, and then the product can be taken out.
[0036] like Figure 2 and Figure 3 As shown, preferably, the first bracket 11 is provided with a positioning pin 12, the positioning pin 12 is fixedly connected to the top of the first bracket 11 and passes through the through hole of the first plate 61, so as to limit the first plate 61. The pneumatic part 40 is provided with a first cylinder 41 and a fixed boss 42, the first cylinder 41 is fixedly connected to the workbench 10, and the fixed boss 42 is fixedly connected to the piston end of the first cylinder 41, so as to abut and fix the first plate 61 under the drive of the first cylinder 41.
[0037] Specifically, the first bracket 11 can be fixed to the workbench 10, and together with the third bracket 13, it serves as the initial placement table for the workpiece 60 to be placed in the test fixture. The first bracket 11 can place the first plate 61, and the third bracket 13 can support the second plate 62, so that the workpiece 60 to be measured can be placed in the fixture relatively stably. In order to position the workpiece 60 to be measured, it is preferred to set a positioning pin 12 on the top of the first bracket 11, and the setting position of the positioning pin 12 corresponds to the through hole on the first plate 61, so that after the workpiece 60 to be measured is placed on the first bracket 11, the through hole of the first plate 61 is just stuck on the positioning pin 12, so that the workpiece 60 to be measured is positioned and fixed.
[0038] like Figure 2 and Figure 5As shown, preferably, the pneumatic part 40 is further provided with a fixed clamping platform 44, the second bracket 20 is provided with two positioning blocks 24 arranged opposite to each other, the positioning blocks 24 are fixedly connected to the second bracket 20, and the two positioning blocks 24 are respectively provided with slide grooves 25 on opposite sides, and the two sides of the fixed clamping platform 44 are respectively provided with slide rails 45 corresponding to the positions of the slide grooves 25, and the slide rails 45 and the slide grooves 25 cooperate with each other, so that the fixed clamping platform 44 is slidably connected to the positioning blocks 24. The pneumatic part 40 is also provided with a second cylinder 43, the second cylinder 43 is fixedly connected to the second bracket 20, and the fixed clamping platform 44 is fixedly connected to the piston end of the second cylinder 43, so that the second plate 62 is clamped and fixed under the drive of the second cylinder 43. The fixed clamping platform 44 has a limiting notch 46 at one end close to the second bracket 20 . The fixed clamping platform 44 moves toward the second plate 62 under the drive of the second cylinder 43 , so that the limiting notch 46 is sleeved on the second plate 62 , thereby clamping and fixing the second plate 62 .
[0039] Specifically, in order to perform rotation test and running-in on the workpiece 60 to be tested, its two plates need to be fixed, but in order to facilitate the placement of the workpiece, its fixing method needs to consider convenient opening and closing. Therefore, a fixed card table 44 can be set, and the limiting notch 46 on the fixed card table 44 can be sleeved on the free end of the second plate 62, so as to fix the second plate 62. In order to make the fixed card table 44 move conveniently, a corresponding positioning block 24 can also be set, and the slide groove 25 on the positioning block 24 and the slide rail 45 on the fixed card table 44 cooperate with each other to form a sliding connection, and the second cylinder 43 is used to drive the fixed card table 44 so that it can fix or release the second plate 62.
[0040] like Figure 2 As shown, preferably, it also includes a sensor component 50, wherein the sensor component 50 is provided with a first sensor 51 and a first sensing sheet 52, wherein the first sensing sheet 52 is fixedly connected to the upper portion of the second bracket 20, and the first sensor 51 is fixedly connected to the position of the electric part 30 corresponding to the first sensing sheet 52, so that the first sensor 51 and the first sensing sheet 52 cooperate with each other, and can sense that the second plate 62 and the first plate 61 are in a vertical state.
[0041] Specifically, when the second plate 62 of the workpiece 60 is driven by the second bracket 20 to rotate a certain angle, that is, when the angle formed between the second plate 62 and the first plate 61 is 90 degrees, the first sensor 51 and the first sensing sheet 52 can be set to sense whether the second plate 62 of the workpiece 60 is rotated to the right position, and can also be used as a counting source for one rotation of the workpiece 60, so that the control module can read the corresponding count. The sensor can be a photoelectric sensor or a magnetic sensor, as long as it can correctly sense the position of the corresponding sensing sheet.
[0042] like Figure 4 As shown, preferably, the sensor assembly 50 is also provided with a second sensor 53 and a second sensing sheet 54. The second sensing sheet 54 is fixed to the lower part of the second bracket 20, and the second sensor 53 is fixed to the position of the electric part 30 corresponding to the second sensing sheet 54, so that the second sensor 53 and the second sensing sheet 54 cooperate with each other and can sense that the second plate 62 and the first plate 61 are in a parallel state.
[0043] Specifically, when the workpiece 60 to be measured is initially placed on the test fixture, the first plate 61 and the second plate 62 are already flat, that is, the rotation angle between the second plate 62 and the first plate 61 is 180 degrees. Therefore, it can be conveniently placed in the fixture, so that the fixed boss 42 and the fixed clamping table 44 fix the first plate 61 and the second plate 62 respectively. At the same time, by setting the second sensor 53 and the second sensing sheet 54, it can be sensed that the workpiece 60 to be measured has returned to its original state after rotating a certain angle. Similarly, the sensor can be a photoelectric sensor or a magnetic sensor, which can correctly sense the position of the corresponding sensing sheet.
[0044] like Figures 2 to 5 As shown, preferably, the electric part 30 is provided with a first motor 31 and a second motor 32 which are respectively fixed to the workbench 10 and located on both sides of the workpiece 60 to be measured, and the second bracket 20 is provided with a first rotating arm 21, a second rotating arm 22 and a bracket beam 23, the first rotating arm 21 is transmission-connected to the driving end of the first motor 31, the second rotating arm 22 is transmission-connected to the driving end of the second motor 32, and the two ends of the bracket beam 23 are respectively fixed to the first rotating arm 21 and the second rotating arm 22.
[0045] Specifically, the second cylinder 43 and the positioning block 24 are respectively fixed to the support beam 23, and the first rotating arm 21 and the second rotating arm 22 are rotated under the drive of the first motor 31 and the second motor 32, and the support beam 23 is driven to rotate synchronously, so that the second cylinder 43 and the positioning block 24 can rotate synchronously. The first motor 31 and the second motor 32 are preferably configured with adjustable speed synchronous motors, so a synchronous motor speed control switch can also be provided in the distribution box 71, and the rotation speed of the motor can be adjusted to meet the test requirements of different workpieces 60 to be measured. Moreover, using two motors and two rotating arms to rotate at the same time can not only increase the torque of rotation, but also improve its rotation stability, so that the rotation force on the workpiece 60 to be measured is more uniform, and avoid the problem that a single motor and a single rotating arm easily cause damage to the workpiece 60 to be measured.
[0046] When using, operation step 1: adjust the equipment operating parameters, set the corresponding running-in program or endurance test program, and adjust the corresponding number of rotations and rotation speeds.
[0047] Operation step 2: Place the armrest hinge assembly (finished product) moved to 180° into the fixture equipment, place the first plate 61 of the workpiece 60 to be measured on the first bracket 11, and correctly insert the positioning pin 12 on the first bracket 11 into the corresponding through hole of the first plate 61. At the same time, the second plate 62 can be placed in parallel on the third bracket 13 to form a relatively stable placement state.
[0048] Operation step 3: Start the operation switch, the first cylinder 41 operates, and the fixed boss 42 moves downward, so that it abuts against the first plate 61, and forms a fixed connection with the first plate 61. At the same time, the second cylinder 43 operates, and the fixed clamping platform 44 moves toward the workpiece 60 to be measured, so that its limit notch 46 is just clamped on the free end of the second plate 62, and forms a fixed connection with the second plate 62. Then the first motor 31 and the second motor 32 operate synchronously, driving the first rotating arm 21 and the receiving rotating arm to rotate simultaneously, so that the fixed clamping platform 44 on the second bracket 20 rotates synchronously, and the second plate 62 is rotated or tested. After the preset number of rotations is completed, the motor drives the second plate 62 to restore the 180° state, and the cylinder operates in the reverse direction, and the fixed boss 42 and the fixed clamping platform 44 are retracted to the initial state, and the test is completed. At this time, the workpiece 60 to be measured can be taken out, and then the next workpiece is put in to continue the test.
[0049] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.
Claims
1. An improved pneumatic running-in durability test fixture, characterized in that: The invention comprises a first bracket (11), a second bracket (20), an electric part (30) and a pneumatic part (40) mounted on a workbench (10); the first bracket (11) is fixedly connected to the workbench (10) and is used to fix a first plate (61) of a workpiece (60) to be measured and to limit the first plate (61); the second bracket (20) is transmission-connected to a driving shaft of the electric part (30) and fixes a second plate (62) of the workpiece (60) to be measured via the pneumatic part (40), so that the electric part (30) is operated, driving the second bracket (20) to rotate a certain angle, and causing the second plate (62) to rotate a certain angle relative to the first plate (61).
2. An improved pneumatic running-in durability test fixture according to claim 1, characterized in that: The first bracket (11) is provided with a positioning pin (12), the positioning pin (12) being fixedly connected to the top of the first bracket (11) and passing through a through hole of the first plate (61), thereby performing a limiting operation on the first plate (61).
3. An improved pneumatic running-in durability test fixture according to claim 1, characterized in that: The pneumatic part (40) is provided with a first cylinder (41) and a fixed boss (42), wherein the first cylinder (41) is fixedly connected to the workbench (10), and the fixed boss (42) is fixedly connected to the piston end of the first cylinder (41), so that the first plate (61) is abutted and fixed under the drive of the first cylinder (41).
4. The improved pneumatic running-in durability test fixture according to claim 1, characterized in that: The pneumatic part (40) is further provided with a fixed card platform (44), the second bracket (20) is provided with two positioning blocks (24) arranged opposite to each other, the positioning blocks (24) are fixedly connected to the second bracket (20), and the two positioning blocks (24) are respectively provided with slide grooves (25) on opposite sides, and the fixed card platform (44) is respectively provided with slide rails (45) at positions corresponding to the slide grooves (25), and the slide rails (45) and the slide grooves (25) cooperate with each other so that the fixed card platform (44) is slidably connected to the positioning blocks (24).
5. An improved pneumatic running-in durability test fixture according to claim 4, characterized in that: The pneumatic part (40) is further provided with a second cylinder (43), the second cylinder (43) being fixedly connected to the second bracket (20), and the fixed clamping platform (44) being fixedly connected to the piston end of the second cylinder (43), so that the second plate (62) is clamped and fixed under the drive of the second cylinder (43).
6. An improved pneumatic running-in durability test fixture according to claim 5, characterized in that: A limiting notch (46) is provided at one end of the fixed clamping platform (44) close to the second bracket (20); the fixed clamping platform (44) is driven by the second cylinder (43) to move toward the second plate (62), so that the limiting notch (46) is sleeved on the second plate (62), thereby clamping and fixing the second plate (62).
7. The improved pneumatic running-in durability test fixture according to claim 1, characterized in that: The sensor assembly (50) is provided with a first sensor (51) and a first sensing sheet (52). The first sensing sheet (52) is fixedly connected to the upper portion of the second bracket (20). The first sensor (51) is fixedly connected to the electric part (30). The first sensor (51) and the first sensing sheet (52) cooperate with each other corresponding to the position of the first sensing sheet (52) to sense the rotation state between the second plate (62) and the first plate (61).
8. An improved pneumatic running-in durability test fixture according to claim 7, characterized in that: The sensor assembly (50) is further provided with a second sensor (53) and a second sensing sheet (54). The second sensing sheet (54) is fixedly connected to the lower portion of the second bracket (20). The second sensor (53) is fixedly connected to the electric part (30). The second sensor (53) and the second sensing sheet (54) cooperate with each other corresponding to the position of the second sensing sheet (54) to sense the rotation state between the second plate member (62) and the first plate member (61).
9. The improved pneumatic running-in durability test fixture according to claim 1, characterized in that: The electric part (30) is provided with a first motor (31) and a second motor (32) respectively fixed to the workbench (10) and located on both sides of the workpiece (60) to be measured; the second bracket (20) is provided with a first rotating arm (21), a second rotating arm (22) and a bracket crossbeam (23); the first rotating arm (21) is transmission-connected to the driving end of the first motor (31); the second rotating arm (22) is transmission-connected to the driving end of the second motor (32); and the two ends of the bracket crossbeam (23) are respectively fixed to the first rotating arm (21) and the second rotating arm (22).
10. An improved pneumatic running-in durability test fixture according to claim 1, characterized in that: It also includes an air supply device, a distribution box (71), a control switch (72) and a control module, wherein the air supply device is used to provide a high-pressure airflow to the cylinder of the pneumatic part (40), the distribution box (71) is electrically connected to the electric part (30), the sensor component (50), the control switch (72) and the control module, respectively, and the control module is provided with a running-in test program and a durability test program.