CN219349074U

CN219349074U - Switch life test fixture

Info

Publication number: CN219349074U
Application number: CN202320213274.3U
Authority: CN
Inventors: 周晓刚; 刘新元
Original assignee: Beijing Zhongtian Xingkong Science & Technology Development Co ltd
Current assignee: Beijing Zhongtian Xingkong Science & Technology Development Co ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-07-14
Anticipated expiration: 2033-02-15

Abstract

The utility model provides a switch service life testing tool, which relates to the technical field of tools and comprises a pressing component, a rotating component and a bottom plate; the pressing component and the rotating component are respectively arranged on the bottom plate and are respectively connected with the switch knob; the pressing component comprises a push-pull mechanism and a pressing mechanism; the push-pull mechanism is installed on the bottom plate, and the mobile end of the push-pull mechanism is connected with one end of the pressing mechanism, and the other end of the pressing mechanism is used for being abutted with the switch knob. Through setting up pressing component and rotating assembly and pressing and rotating the switch knob, simulate manual pressing and manual rotary switch's action, push-pull mechanism drives pressing mechanism and removes for pressing mechanism's the other end extrudees the switch knob, thereby realizes pressing the switch knob, and rotating assembly drives the switch knob rotation simultaneously, shortens operating time, can improve efficiency of software testing greatly.

Description

Switch life test fixture

Technical Field

The utility model relates to the technical field of tools, in particular to a switch life test tool.

Background

The landing gear brake switch of the aircraft needs to undergo tens of thousands of life tests when tested by factory tests. In the existing life test process, a manual operation press switch is needed, a switch handle is rotated to a plurality of gears simultaneously, and the resistance value of each gear is required to be collected and analyzed with a normal value. All the tests of several gears are counted as one test. The life test requires more than 1 ten thousand repeated operations. The existing manual operation test has low efficiency.

Disclosure of Invention

The utility model aims to solve the problems that the existing manual operation test is very low in efficiency.

In order to solve the problems, the utility model provides a switch life test fixture which comprises a pressing component, a rotating component and a bottom plate;

the pressing component and the rotating component are respectively arranged on the bottom plate, the pressing component is used for pressing the switch knob, and the rotating component is used for driving the switch knob to rotate; the pressing assembly comprises a push-pull mechanism and a pressing mechanism, the push-pull mechanism is installed on the bottom plate, the moving end of the push-pull mechanism is connected with one end of the pressing mechanism, and the other end of the pressing mechanism is used for being abutted to the switch knob.

Optionally, the pressing mechanism includes pull rod, pendulum rod, support, protective cylinder, push rod and first mount pad, the one end of pull rod with push-and-pull mechanism's removal end links to each other, the other end of pull rod with the one end of pendulum rod links to each other, the other end of pendulum rod with the one end butt of push rod, the support mounting is in on the bottom plate, the one end of protective cylinder is installed on the support, the other end of protective cylinder with first mount pad links to each other, the pendulum rod is rotated and is installed on the support, rotate the mounting point and be located between the both ends of pendulum rod, the push rod runs through in proper order the support protective cylinder with first mount pad, first mount pad is used for installing the switch, the other end of push rod with switch knob butt.

Optionally, the pressing assembly further comprises a pressure sensor, wherein the pressure sensor is installed on the moving end of the push-pull mechanism, and one end of the pressure sensor is connected with one end of the pull rod.

Optionally, the pressing assembly further comprises a second mounting seat, the second mounting seat is mounted on the bottom plate, the push-pull mechanism is mounted on the second mounting seat, a travel switch is mounted on the second mounting seat, and the triggering range of the triggering end of the travel switch is intersected with the running track of the moving end of the push-pull mechanism.

Optionally, the rotating assembly comprises a servo motor and a rotating mechanism, the servo motor is installed on the bottom plate, the output end of the servo motor is connected with one end of the rotating mechanism, and the other end of the rotating mechanism is connected with the switch knob.

Optionally, the rotating mechanism comprises a shifting fork and a transmission piece, one end of the shifting fork is connected with the output end of the servo motor, the other end of the shifting fork is eccentrically connected with one end of the transmission piece, and the other end of the transmission piece is clamped with the switch knob.

Optionally, the driving medium includes carousel, sleeve and chuck, the carousel is installed telescopic one end, the chuck is installed telescopic other end, the sleeve runs through in proper order the support the protection section of thick bamboo with first mount pad, the other end eccentric mounting of shift fork is in on the carousel, the chuck with switch knob joint.

Optionally, the rotating assembly further includes a torque limiter and a torque sensor, the torque limiter and the torque sensor are disposed between the servo motor and the rotating mechanism, the torque sensor is mounted on the bottom plate, one end of the torque sensor is connected with an output end of the servo motor, the other end of the torque sensor is connected with one end of the torque limiter, and the other end of the torque limiter is connected with one end of the rotating mechanism.

Optionally, the switch life test fixture further comprises a temperature box, and the temperature box is arranged on one side of the switch, which is far away from the push-pull mechanism.

Optionally, the switch life test fixture further includes a lifting platform, the lifting platform includes a lifter and a guide rod, the lifter is installed on the mobile vehicle, one end of the lifting rod in the lifter is connected with the bottom plate, one end of the guide rod is connected with the bottom plate, the guide rod penetrates through the mobile vehicle table surface, and the guide rod is parallel to the lifting rod.

Compared with the prior art, the utility model has the following beneficial effects:

according to the switch service life testing tool provided by the utility model, the pressing assembly and the rotating assembly are arranged to press and rotate the switch knob, the actions of manual pressing and manual rotating of the switch are simulated, and the push-pull mechanism drives the pressing mechanism to move, so that the other end of the pressing mechanism extrudes the switch knob, the pressing of the switch knob is realized, and meanwhile, the rotating assembly drives the switch knob to rotate, so that the operation time is shortened, and the testing efficiency can be greatly improved.

Drawings

Fig. 1 shows an overall structure schematic diagram of a switch life test tool in an embodiment of the utility model;

fig. 2 is a schematic diagram of a partial structure of a switch life test tool according to an embodiment of the present utility model;

FIG. 3 shows a partial cross-sectional view of a switch life test fixture in an embodiment of the utility model;

fig. 4 shows a front view of a switch life test fixture in an embodiment of the utility model.

Reference numerals illustrate:

1. a linear sliding table; 2. a pressure sensor; 3. a servo motor; 4. a torque limiter; 5. a torque sensor; 6. a lifting table; 60. a lifter; 61. a guide rod; 7. a switch; 8. a pressing mechanism; 80. a pull rod; 81. swing rod; 82. a bracket; 83. a protective cylinder; 84. a push rod; 85. a first mount; 9. a rotating mechanism; 90. a shifting fork; 91. a turntable; 92. a sleeve; 93. a chuck; 10. a second mounting base; 11. a bottom plate.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. While the utility model is susceptible of embodiment in the drawings, it is to be understood that the utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the utility model. It should be understood that the drawings and embodiments of the utility model are for illustration purposes only and are not intended to limit the scope of the present utility model.

It should be understood that the various steps recited in the method embodiments of the present utility model may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the utility model is not limited in this respect.

The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "alternative embodiments". Related definitions of other terms will be given in the description below. It should be noted that the terms "first," "second," and the like herein are merely used for distinguishing between different devices, modules, or units and not for limiting the order or interdependence of the functions performed by such devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates otherwise.

Fig. 1 shows a schematic overall structure of a switch life test fixture according to an embodiment of the present utility model, where the switch life test fixture includes a pressing component, a rotating component, and a base plate 11; the pressing component and the rotating component are respectively arranged on the bottom plate 11, the pressing component is used for pressing the switch knob, and the rotating component is used for driving the switch knob to rotate; the pressing assembly comprises a push-pull mechanism and a pressing mechanism 8; the push-pull mechanism is arranged on the bottom plate 11, the moving end of the push-pull mechanism is connected with one end of the pressing mechanism 8, and the other end of the pressing mechanism 8 is used for being abutted with the switch knob.

It should be noted that the switch 7 is mounted at one end of the pressing assembly, and the switch 7 is stationary relative to the base plate 11, and the switch 7 is provided with "LO", "MED", "HI", "OFF" and "RTO" gear positions. The push-pull mechanism can be a linear sliding table 1 shown in fig. 1, and also can be a telescopic mechanism such as an air cylinder or an oil cylinder, wherein a servo motor is arranged in the linear sliding table 1 as a power source. The pressing mechanism 8 can be a special-shaped rod, one end of the special-shaped rod is connected with the moving end of the linear sliding table 1, and the other end of the special-shaped rod is contacted with a knob of the switch 7; the pressing mechanism 8 may also be a telescopic rod, the telescopic end of which is in contact with the switch knob. In addition, the rotating component can be a structure that the motor directly drives the switch knob to rotate through the fixing piece, or the motor drives the switch knob to rotate through the transmission piece, and the transmission piece can avoid the pressing component, so that interference between the motor and the pressing component in the power transmission process is prevented.

In this embodiment, through setting up pressing component and rotating assembly and pressing and rotating the switch knob, simulate manual pressing and manual rotary switch's action, push-pull mechanism drives pressing mechanism 8 and removes for pressing mechanism 8's the other end extrudees the switch knob, thereby realizes pressing the switch knob, and rotating assembly drives the switch knob rotation simultaneously, shortens operating time, can improve test efficiency greatly.

In one embodiment of the present utility model, as shown in fig. 2 and 3, the pressing mechanism 8 includes a pull rod 80, a swing rod 81, a support 82, a protection cylinder 83, a push rod 84, and a first mounting seat 85, one end of the pull rod 80 is connected to a moving end of the push-pull mechanism, the other end of the pull rod 80 is connected to one end of the swing rod 81, the other end of the swing rod 81 abuts against one end of the push rod 84, the support 82 is mounted on the bottom plate 11, one end of the protection cylinder 83 is mounted on the support 82, the other end of the protection cylinder 83 is connected to the first mounting seat 85, the swing rod 81 is rotatably mounted on the support 82, a rotating mounting point is located between two ends of the swing rod 81, the push rod 84 sequentially penetrates through the support 82, the protection cylinder 83, and the first mounting seat 85 is used for mounting the switch 7, and the other end of the push rod 84 abuts against the switch knob.

In this embodiment, when the push-pull mechanism drives the pull rod 80 to move, one end of the swing rod 81 moves linearly along with the pull rod 80, and since the swing rod 81 tilts during rotation, the pull rod 80 and the swing rod 81 are in sliding fit at the joint, i.e. one end of the pull rod 80 slides at one end of the swing rod 81, when one end of the swing rod 81 approaches the linear sliding table 1, the swing rod 81 rotates on the bracket 82, the other end of the swing rod 81 pushes the push rod 84 contacted with the swing rod to move, and the push rod 84 presses the switch knob, so that the switch knob achieves the pressing effect. In addition, the switch is fixedly installed on the first installation seat 85, and since the first installation seat 85 is connected with the bracket 82 through the protection cylinder 83, the bracket 82 is fixedly installed on the bottom plate 11, and thus, when the switch knob is pressed or rotated, the switch body does not move. It should be noted that, the servo motor in the linear sliding table 1 is electrically connected with the controller in the measurement and control system, and the controller controls the start and stop of the servo motor.

In one embodiment of the present utility model, as shown in fig. 2, the pressing assembly further includes a pressure sensor 2, the pressure sensor 2 is mounted on a moving end of the push-pull mechanism, and one end of the pressure sensor 2 is connected to one end of the pull rod 80. The pressure sensor 2 is electrically connected with the controller and is used for feeding back the measured tension or pressure to the controller, and the controller monitors the pressure and prevents the switch knob from being applied with excessive pressure so as to avoid the switch from being damaged.

In this embodiment, the pressing assembly further includes a second mounting seat 10, the second mounting seat 10 is mounted on the bottom plate 11, the push-pull mechanism is mounted on the second mounting seat 10, and a travel switch may also be mounted on the second mounting seat 10, and a trigger range of a trigger end of the travel switch intersects with a running track of a moving end of the push-pull mechanism. In the linear sliding table 1, a guide rail sliding block and a pressing mechanism 8 connected with the guide rail sliding block are driven by a servo motor, so that the action of a simulated pressing switch is realized, a pressure sensor 2 is arranged on the linear sliding table 1 for measuring the pressing force, and likewise, a travel switch is arranged on a table top for ensuring safety, when the moving distance of a moving end of a push-pull mechanism exceeds a required displacement range, the moving end can trigger the travel switch, at the moment, the travel switch feeds back a signal to a controller, and the controller timely controls the power supply of the servo motor to cut off, so that the safety of the switch is ensured.

In one embodiment of the present utility model, as shown in fig. 2 and 3, the rotating assembly includes a servo motor 3 and a rotating mechanism 9, the servo motor 3 is mounted on the base plate 11, an output end of the servo motor 3 is connected to one end of the rotating mechanism 9, and the other end of the rotating mechanism 9 is connected to the switch knob.

In this embodiment, the servo motor 3 is a rotation power source, the rotation mechanism 9 is a rotation mechanism, and can transmit the power of the servo motor 3 to the switch knob to drive the switch knob to rotate, so that the rotation mechanism 9 can be a chuck, one end of the chuck is connected with the output shaft of the servo motor 3, and the other end clamps the switch knob; the rotating mechanism 9 can also be a steel tube, and two ends of the rotating mechanism are directly fixedly connected with the output end of the servo motor 3 and the switch knob. When the servo motor 3 rotates, the rotating mechanism 9 drives the switch knob to rotate. The servo motor in the push-pull mechanism and the servo motor in the rotating assembly can be precisely controlled, and errors of manual pressing and rotation are reduced

In one embodiment of the present utility model, as shown in fig. 3, the rotating mechanism 9 includes a shifting fork 90 and a transmission member, one end of the shifting fork 90 is connected to the output end of the servo motor 3, the other end of the shifting fork 90 is eccentrically connected to one end of the transmission member, and the other end of the transmission member is clamped to the switch knob. The shape of the shifting fork 90 is Z-shaped, so that the shifting fork 90 is eccentrically connected with the transmission piece to drive the transmission piece to rotate, and the transmission piece is clamped with the switch knob to enable the switch knob to rotate in order to avoid interference with the pressing mechanism 8 in the pressing assembly.

In one embodiment of the present utility model, as shown in fig. 3, the transmission member includes a rotary disc 91, a sleeve 92 and a chuck 93, the rotary disc 91 is mounted at one end of the sleeve 92, the chuck 93 is mounted at the other end of the sleeve 92, the sleeve 92 sequentially penetrates through the bracket 82, the protective cylinder 83 and the first mounting seat 85, the other end of the shift fork 90 is eccentrically mounted on the rotary disc 91, and the chuck 93 is clamped with the switch knob. The transmission piece is designed in three sections, so that the installation and the processing are convenient, the grooves with the same cross-sectional shape as the switch knob are formed in the chuck 93, the switch knob can be directly placed in the grooves, and when the switch knob is used, the chuck 93 is directly covered on the switch knob, so that the operation is easy in use. It should be noted that the push rod 84 penetrates the turntable 91, the sleeve 92 and the chuck 93, so that the pressing assembly and the rotating assembly can move simultaneously without interfering with each other.

In one embodiment of the present utility model, as shown in fig. 2 and 3, the rotating assembly further comprises a torque limiter 4 and a torque sensor 5, wherein the torque limiter 4 and the torque sensor 5 are arranged between the servo motor 3 and the rotating mechanism 9, the torque sensor 5 is mounted on the base plate 11, one end of the torque sensor 5 is connected with the output end of the servo motor 3, the other end of the torque sensor 5 is connected with one end of the torque limiter 4, and the other end of the torque limiter 4 is connected with one end of the rotating mechanism 9. By adding the torque sensor 5 to the rotating shaft to detect the rotating torque, in order to ensure the rotating safety, a torque limiter 4 is further arranged in the transmission chain to prevent the torque from being too large and avoid the damage of the switch knob.

In one embodiment of the present utility model, the switch life test fixture further includes a temperature box, and the temperature box is disposed on a side of the switch 7 away from the push-pull mechanism. Before the temperature test is performed, the base plate 11 is movable and the switch 7 is placed in the temperature box.

When the temperature test is carried out, the switch 7 is required to be fixed at the temperature of between 55 ℃ below zero and 120 ℃ and the switch knob is driven by a motor to achieve displacement and torque required by the test, so that the switch 7 can work continuously, and whether the switch 7 and the switch knob have faults or not is observed. Because the switch 7 needs to be placed in the temperature box, the protection cylinder 83, the push rod 84, the first mounting seat 85, the sleeve 92 and the chuck 93 need to be made of materials resistant to the test temperature, for example, the chuck 93 can be made of polytetrafluoroethylene materials which can keep good mechanical properties in a wide range of-198-260 ℃, and the polytetrafluoroethylene materials also have good self-lubricating properties, so that the surface of a test piece product can be well protected under the condition of meeting the temperature requirement.

In one embodiment of the present utility model, as shown in fig. 1 and 4, the switch life test fixture further includes a lifting platform 6, the lifting platform 6 includes a lifter 60 and guide rods 61, the lifter 60 is mounted on a mobile vehicle, one end of each lifting rod in the lifter 60 is connected to the base plate 11, one end of each guide rod 61 is connected to the base plate 11, the guide rods 61 penetrate through the mobile vehicle surface, the guide rods 61 are parallel to the lifting rods, bearings are disposed between the guide rods 61 and the base plate 11, the number of the guide rods 61 is at least 1, preferably two guide rods 61 are disposed symmetrically on two sides of the lifter 60. The lifting table 6 provides a mounting table surface for each test mechanism, namely the bottom plate 11 is a table surface of the lifting table, and consists of 1 spiral lifter, two pairs of linear bearings and a guide shaft, a hand wheel is arranged on the lifter 60, the lifter 60 is driven by shaking the hand wheel to drive the lifting table 60 to drive the bottom plate 11 to lift, and the position of the switch 7 in the temperature box is adjusted.

In the utility model, the servo motor in the push-pull mechanism, the servo motor in the rotating assembly, the pressure sensor 2 and the torque sensor 5 are all electrically connected with the controller, wherein the servo motor is electrically connected with the controller through a motor encoder, the controller controls the start and stop of the servo motor, in addition, the pressure sensor 2 and the torque sensor 5 feed back the detected tension data and torque data to the motor encoder, and the motor encoder calculates the retraction displacement of the knob and the rotation angle of the knob. In addition, different gear positions of the switch are electrically connected with the multichannel digital resistor, the multichannel digital resistor measures the resistance value of each contact, and the controller judges the state of each contact by reading the resistance value of the multichannel digital resistor.

The measurement and control system adopts a portable design, and a touch integrated industrial personal computer, a system power supply main switch and the like are integrated inside the measurement and control system. An independent emergency stop button and a working state indicator lamp and an audible alarm device are designed on a panel of the measurement and control system. The measurement and control system sets test parameters through a software interface, and provides test thrust and rotation force for the product through the output of the servo motor and the linear sliding table to the automatic test mechanical clamp. And simultaneously, a torque sensor and a pressure sensor 2 are collected, and a rotation angle value and a thrust value are measured. The measurement and control system also measures the rebound time of the switch of the product. The resistance value of each contact is measured by a multichannel digital resistance meter. Meanwhile, the automatic numerical analysis system can rapidly compare the test value with the theoretical value, give an alarm to the abnormal value, and immediately generate a test report after the test is completed.

By using the above-described tooling, the following tests were performed on the switch 7:

1. logic function test

Pressing the knob at the 'OFF' position, rotating the knob clockwise to the 'LO', 'MED' and 'HI' positions respectively, testing logic output of each gear, and returning to the 'OFF' position;

in the "OFF" position, the knob is rotated counter-clockwise to "RTO" gear test output logic and back to the "OFF" position.

2. Pressing pressure test

Clockwise rotation from the "OFF" position: the servo motor in the linear sliding table 1 is controlled to advance, the pressure sensor 22 detects the pressing pressure in the advancing process, and the displacement of knob retraction is calculated through the rotation value of the motor encoder. When the retraction displacement of the product knob meets the pressing pressure, the servo motor stops pushing, and the pressing work is completed. In the motion process of the servo motor, the software interface synchronously displays a pressing pressure curve, a real-time pressure value, a displacement curve and a real-time displacement value.

3. Clockwise rotational torque test

After the servo motor in the linear sliding table 1 finishes the knob pressing work, the servo motor 3 in the rotating assembly starts to rotate clockwise to drive the knob to rotate clockwise, in the rotating process, the torque sensor 5 detects the rotating torque of the knob, the rotating angle of the knob is calculated through the rotating value obtained by the motor encoder, and the servo motor 3 drives the knob to the LO gear. During the rotation of the servo motor 3, the software interface synchronously displays: 1) Knob torque curve and real-time torque value. 2) Rotation angle value. After the data are collected, the servo motor 3 rotates anticlockwise to drive the knob to return to the OFF gear.

Similarly, the servo motor 3 is controlled to drive the knob to the MED gear to measure and record the numerical value while the servo motor in the linear sliding table 1 completes the knob pressing work. The servo motor 3 is controlled to drive the knob to the 'HI' gear to measure and record the numerical value while the servo motor in the linear sliding table 1 completes the knob pressing work.

4. Counterclockwise rotational torque test

Counterclockwise rotation from the "OFF" position: the servo motor in the linear sliding table 1 stops at an initial position and does not act, the servo motor 3 directly drives the knob to rotate anticlockwise, in the rotation of the servo motor 3, the torque sensor 5 detects the torque of the knob, the rotation angle of the knob is calculated through the rotation value obtained by the motor encoder, and the servo motor 3 drives the knob to an RTO gear. During the rotation of the servo motor 3, the software interface synchronously displays: 1) Knob torque curve and real-time torque value. 2) Rotation angle value. And the logic output table drives the knob to return to the OFF gear by the counterclockwise rotation of the servo motor 3.

5. Switch rebound time test

And switching on the power supply of the switch to be tested, pressing down the knob at the 'OFF' position, respectively rotating the knob to the 'LO', 'MED' and 'HI' positions in the clockwise direction, switching OFF the power supply of the switch to be tested, and recording rebound time when the knob automatically returns to the 'OFF' position.

And switching on the power supply of the switch to be tested, rotating the knob anticlockwise to an RTO gear at the 'OFF' position, switching OFF the power supply of the switch to be tested, and recording the rebound time when the knob is automatically restored to the 'OFF' position.

6. High and low temperature life test

Primary life test process:

pressing a knob at an OFF position, rotating the knob clockwise to LO, MED and HI positions respectively, testing logic output and recording, cutting OFF power supply, and automatically returning the switch knob to the OFF position;

the knob is pressed in the OFF position, the logic output is tested and recorded after the knob is rotated anticlockwise to the RTO position, then the power supply is cut OFF, and the switch knob automatically returns to the OFF position.

Above-mentioned switch life-span test frock has solved the rotation of brake switch and has pressed the interference problem of simultaneous operation. The problems that products are damaged easily due to overlarge pressure and torque are solved by using the pressure sensor 2, the torque sensor, the limit switch and the like, and the service life testing tool of the switch is high in repeatability testing efficiency; the rotation angle and the pressing stroke precision are high; the rotation force and the pressing force are stable, and the appearance of the product is not damaged. In addition, the test data statistics of the measurement and control system is efficient and convenient.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims

1. The switch life test fixture is characterized by comprising a pressing component, a rotating component and a bottom plate (11);

the pressing component and the rotating component are respectively arranged on the bottom plate (11), the pressing component is used for pressing the switch knob, and the rotating component is used for driving the switch knob to rotate; the pressing assembly comprises a push-pull mechanism and a pressing mechanism (8); the push-pull mechanism is arranged on the bottom plate (11), the moving end of the push-pull mechanism is connected with one end of the pressing mechanism (8), and the other end of the pressing mechanism (8) is used for being abutted to the switch knob.

2. The switch life test fixture according to claim 1, wherein the pressing mechanism (8) includes a pull rod (80), a swing rod (81), a support (82), a protective cylinder (83), a push rod (84) and a first mounting seat (85), one end of the pull rod (80) is connected with a moving end of the push-pull mechanism, the other end of the pull rod (80) is connected with one end of the swing rod (81), the other end of the swing rod (81) is abutted with one end of the push rod (84), the support (82) is mounted on the bottom plate (11), one end of the protective cylinder (83) is mounted on the support (82), the other end of the protective cylinder (83) is connected with the first mounting seat (85), the swing rod (81) is rotatably mounted on the support (82), a rotating mounting point is located between two ends of the swing rod (81), the push rod (84) sequentially penetrates through the support (82), the protective cylinder (83) and the first mounting seat (85), and the other end of the protective cylinder (83) is used for being abutted against the push rod switch (7).

3. The switch life test fixture of claim 2, wherein the pressing assembly further comprises a pressure sensor (2), the pressure sensor (2) is mounted on a moving end of the push-pull mechanism, and one end of the pressure sensor (2) is connected with one end of the pull rod (80).

4. A switch life test fixture according to any one of claims 1-3, wherein the pressing assembly further comprises a second mounting seat (10), the second mounting seat (10) is mounted on the bottom plate (11), the push-pull mechanism is mounted on the second mounting seat (10), a travel switch is mounted on the second mounting seat (10), and a trigger range of a trigger end of the travel switch is intersected with a running track of a moving end of the push-pull mechanism.

5. The switch life test fixture according to claim 2, wherein the rotating assembly comprises a servo motor (3) and a rotating mechanism (9), the servo motor (3) is mounted on the bottom plate (11), an output end of the servo motor (3) is connected with one end of the rotating mechanism (9), and the other end of the rotating mechanism (9) is connected with the switch knob.

6. The switch life test fixture according to claim 5, wherein the rotating mechanism (9) comprises a shifting fork (90) and a transmission piece, one end of the shifting fork (90) is connected with the output end of the servo motor (3), the other end of the shifting fork (90) is eccentrically connected with one end of the transmission piece, and the other end of the transmission piece is clamped with the switch knob.

7. The switch life test fixture of claim 6, wherein the transmission member comprises a turntable (91), a sleeve (92) and a chuck (93), the turntable (91) is mounted at one end of the sleeve (92), the chuck (93) is mounted at the other end of the sleeve (92), the sleeve (92) sequentially penetrates through the bracket (82), the protective cylinder (83) and the first mounting seat (85), the other end of the shifting fork (90) is eccentrically mounted on the turntable (91), and the chuck (93) is clamped with the switch knob.

8. The switch life test fixture according to any of claims 5-7, wherein the rotating assembly further comprises a torque limiter (4) and a torque sensor (5), the torque limiter (4) and the torque sensor (5) are arranged between the servo motor (3) and the rotating mechanism (9), the torque sensor (5) is mounted on the bottom plate (11), one end of the torque sensor (5) is connected with an output end of the servo motor (3), the other end of the torque sensor (5) is connected with one end of the torque limiter (4), and the other end of the torque limiter (4) is connected with one end of the rotating mechanism (9).

9. The switch life test fixture of claim 1, further comprising a temperature box disposed on a side of the switch (7) remote from the push-pull mechanism.

10. The switch life test fixture according to claim 1, further comprising a lifting table (6), wherein the lifting table (6) comprises a lifter (60) and a guide rod (61), the lifter (60) is mounted on a mobile vehicle, one end of the lifting rod in the lifter (60) is connected with the bottom plate (11), one end of the guide rod (61) is connected with the bottom plate (11), the guide rod (61) penetrates through the mobile vehicle surface, and the guide rod (61) is parallel to the lifting rod.