A linear motion actuator life test device and test method

Abstract

The present invention belongs to the technical field of actuator performance detection, and specifically relates to a linear motion actuator life test device and a test method. The linear motion actuator life test device provided by the present invention includes a fixedly installed first fixed frame, a rotating frame rotatably connected to the first fixed frame, and a bearing device for fixing the actuator to be tested. The rotating frame is provided with a friction disk that rotates with the rotating frame; the first fixed frame is provided with a friction device that controllably applies friction to the friction disk. In the process of the actuator to be tested applying force to the rotating frame, the friction device applies friction to the friction disk according to the required force application rules. The linear motion actuator life test device and the test method provided by the present invention can accurately simulate the force change process of the actuator during operation, especially can accurately simulate the working conditions of the linear motion actuator used to open the refrigerator door, so it can more accurately evaluate the service life.

Description

Technical Field

[0001] The invention belongs to the technical field of actuator performance detection, and in particular relates to a linear motion actuator life test device and a test method. Background Art

[0002] With the development of economy and the progress of society, people's living standards have been greatly improved. As an indispensable electrical appliance in people's lives, home appliances are also constantly affecting people's lifestyles. Intelligence has become a mainstream trend in the home appliance industry, which provides more choices for home appliances in daily use and overall home design.

[0003] In household appliances such as dishwashers, wine cabinets, kitchen cabinets and refrigerators, the use of actuators to automatically control various moving parts is the basis for realizing the intelligence of household appliances. Taking the automatic opening and closing of refrigerator doors as an example, the current mainstream solution is to combine the use of linear motion actuators and rotary actuators, intervene at different stages of opening and closing the door, and make the entire opening and closing process fully automated, such as the solution adopted by Zhuhai Gree Electric Appliances Co., Ltd. in patent CN114857828A. In addition, Yukeshile Plastic Products (Taicang) Co., Ltd. proposed linear motion actuators and rotary actuators suitable for household appliances such as refrigerators in patents CN106761149A and CN212752039U respectively earlier. In recent years, after research and attempts by many units in the industry, it is now generally recognized that refrigerators need to overcome the strong resistance caused by atmospheric pressure differences and door seals at the moment of opening the door, and a single rotary actuator is difficult to handle all the actions of opening and closing the door. Therefore, the solution of linear motion actuators combined with rotary actuators to drive the opening and closing of refrigerator doors is still the mainstream solution at present and for a long time in the future.

[0004] In the above scheme, the main function of the linear motion actuator is to provide a large thrust to push the refrigerator door open at the moment of opening the door. The moment the refrigerator door is opened, it is necessary to overcome the strong resistance caused by the atmospheric pressure difference and the door seal. When the refrigerator door is turned a small angle, the rotational resistance is significantly reduced. However, the existing equipment for testing the life of linear motion actuators mainly operates the actuator under constant load conditions to evaluate its service life, which is quite different from the actual working conditions. Therefore, the reliability of the evaluated service life is relatively low. In order to ensure the stable operation of the linear motion actuator within the design life, the solution of greatly increasing the design margin is often adopted in practice, but this also results in increased costs and excessive redundancy of performance. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a linear motion actuator life test device and a test method.

[0006] The present invention tracks and analyzes the entire process of the linear motion actuator actually driving the refrigerator door to open, and finds that the force applied by the linear motion actuator in the process of pushing the refrigerator door to open varies greatly and is irregular.

[0007] Based on this, the linear motion actuator life test device proposed in the present invention comprises: a fixedly installed first fixing frame, a rotating frame rotatably connected to the first fixing frame, and a bearing device for fixing the actuator to be tested.

[0008] The rotating frame is provided with a friction disk which rotates with the rotating frame; the first fixed frame is provided with a friction device which can controllably apply friction to the friction disk.

[0009] When the actuator to be tested applies force to the rotating frame, the friction device applies friction to the friction disk according to the required force application rule.

[0010] Furthermore, in the above-mentioned linear motion actuator life test equipment, the friction device includes a slider slidably connected to the first fixed frame, a friction block slidably connected to the slider, an elastic member connected between the slider and the friction block, a driving rod threadably connected to the slider, and a power unit that drives the driving rod to rotate.

[0011] The friction block can squeeze the friction disc; the sliding direction of the slider, the sliding direction of the friction block, and the axial direction of the driving rod are all in the same direction.

[0012] Furthermore, in the above linear motion actuator life test device, the end of the friction block has an arc-shaped recessed portion, and the arc-shaped recessed portion faces the peripheral side surface of the friction disk.

[0013] Furthermore, in the above-mentioned linear motion actuator life test device, the elastic member is a coil spring; one end of the elastic member is fixedly connected to the friction block, and the other end of the elastic member is fixedly connected to the sliding block.

[0014] Furthermore, the above-mentioned linear motion actuator life test equipment also includes a fixedly installed second fixing frame; the second fixing frame has a plurality of electromagnetic generating components on one side close to the rotating frame; and the rotating frame has a plurality of magnetically attractable components facing the electromagnetic generating components.

[0015] Furthermore, in the above-mentioned linear motion actuator life test equipment, the magnetically attractive part is a long iron sheet; the upper, middle and lower parts of the rotating frame are laterally fixed with magnetically attractive parts, and the side of the rotating frame away from the friction disk is fixed with a vertical magnetically attractive part; the electromagnetic generating part is an electromagnet distributed along the magnetically attractive part.

[0016] Furthermore, in the above-mentioned linear motion actuator life test equipment, the bearing device is a fixedly installed rigid bracket; the actuator to be tested is fixed on the rigid bracket.

[0017] Furthermore, in the above-mentioned linear motion actuator life test equipment, the supporting device includes a fixedly installed vertical bracket, a pair of vertical screws rotatably installed on the vertical bracket, a screw motor driving the vertical screw to rotate, a lifting platform spirally matched with the screw, an adjusting motor fixed on the lifting platform, a worm installed on the output shaft of the adjusting motor, a rotating table rotatably connected to the lifting platform, and a worm wheel coaxially connected to the rotating table; the worm wheel is meshing with the worm.

[0018] A testing method is further provided for testing the life of a linear motion actuator, using the above-mentioned linear motion actuator life testing device.

[0019] The test method includes the following steps:

[0020] Step 1: Detect the force of the actuator to be tested in the actual application scenario, and record the curve of the actual force changing with time, which is recorded as the first force curve;

[0021] Step 2: Fix the actuator to be tested on the carrying device so that the working component of the actuator to be tested acts on the rotating frame;

[0022] Step 3: Supplying power to the electromagnetic generating element so that it attracts the magnetically attractable element;

[0023] Step 4: Start the actuator to be tested to apply force to the rotating frame, and record the curve of actual force change over time, which is recorded as the second force curve;

[0024] Step 5: Subtract the first force curve from the second force curve, and the resulting curve is recorded as the third force curve;

[0025] Step 6: Multiply the third force curve by the correction factor K, and the resulting curve is recorded as the fourth force curve; assuming that the extrusion force applied by the friction device to the friction disk is F1, and correspondingly, the extrusion force between the rotating frame and the working part of the actuator to be tested is F2, then the correction factor K=F1 / F2;

[0026] Step seven: Control the friction device to apply extrusion force to the friction disk according to the change rule of the fourth force curve, and supply power to the electromagnetic generator according to the power supply size consistent with step three; run the actuator to be tested multiple times under this condition to evaluate the service life of the actuator to be tested.

[0027] Furthermore, in step 1 and step 4, the curve of actual force variation over time is recorded by setting a pressure sensor at the end of the working component of the actuator to be tested.

[0028] Beneficial effect: Compared with the prior art, the linear motion actuator life test equipment and test method provided by the present invention can accurately simulate the force change process of the actuator during operation, especially can accurately simulate the working conditions of the linear motion actuator used to open the refrigerator door, so it can more accurately evaluate the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a linear motion actuator life test device according to Example 1.

[0030] Figure 2 Schematic diagram of the friction device.

[0031] Figure 3 for Figure 2 A partial enlarged view of .

[0032] Figure 4 Schematic diagram of the structure of the second fixing frame.

[0033] Figure 5 It is a structural schematic diagram of the rotating frame.

[0034] Figure 6 This is a schematic structural diagram of a linear motion actuator life test device according to Example 2.

[0035] Figure 7 This is a schematic structural diagram of the carrying device of Example 2.

[0036] Figure 8 and Fig. 9 This is a schematic diagram of the partial structure of the carrying device of Example 2.

[0037] Fig.10 It is a schematic diagram of the first force curve.

[0038] Fig.11 It is a schematic diagram of the second force curve.

[0039] Fig.12 It is a schematic diagram of the third force curve.

[0040] Fig.13 It is a schematic diagram of the fourth force curve.

[0041] In the figure, a first fixed frame 1, a rotating frame 2, a carrying device 3, a friction disk 21, a friction device 11, a slider 111, a friction block 112, an elastic member 113, a driving rod 114, a power unit 115, an arc-shaped recessed portion 1121, a second fixed frame 4, an electromagnetic generating member 41, a magnetically attractive member 22, a vertical bracket 31, a vertical screw 32, a screw motor 33, a lifting platform 34, an adjusting motor 35, a worm 36, a rotating platform 37, and a worm wheel 38. DETAILED DESCRIPTION

[0042] The present invention is further illustrated by the following examples, which are intended to more clearly illustrate the technical solution of the present invention and should not be construed as a limitation.

[0043] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood as the usual meanings understood by people with ordinary skills in the field. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] Example 1

[0045] A linear motion actuator life test device comprises a first fixed frame 1, a rotating frame 2 rotatably connected to the first fixed frame 1, and a bearing device 3 for fixing the actuator to be tested. Figure 1 As shown, the first fixed frame 1 is generally a vertical bracket, fixed on the ground or the bottom plate, and the first fixed frame 1 has multiple platforms for installing other components; the rotating frame 2 is generally in the shape of a door panel, and one side of the rotating frame 2 is hinged to the first fixed frame 1, and the hinged part is connected by a bearing to ensure smooth rotation of the rotating frame 2; the bearing device 3 is also fixed on the ground or the bottom plate. The bearing device 3 of this embodiment is a rigid bracket, and the actuator to be tested can be directly fixed on the rigid bracket.

[0046] like Figure 2 As shown, a friction disc 21 is also installed at the rotating connection portion of the rotating frame 2, and the friction disc 21 rotates together with the rotating frame 2; a friction device 11 for controllably applying friction to the friction disc 21 is provided on the first fixed frame 1; when the actuator to be tested applies force to the rotating frame 2, the friction device 11 can apply friction to the friction disc 21 according to the required force application rules to simulate the actual operating conditions, so that the service life of the actuator to be tested can be more accurately evaluated.

[0047] like Figure 2As shown, the friction device 11 comprises a slider 111 slidably connected to the first fixed frame 1, a friction block 112 slidably connected to the slider 111, an elastic member 113 connected between the slider 111 and the friction block 112, a driving rod 114 threadedly connected to the slider 111, and a power unit 115 for driving the driving rod 114 to rotate. The slider 111 has a slide rail at the bottom thereof for sliding connection with a slide groove provided on the upper surface of the first fixed frame 1, and the friction block 112 also has a slide rail at the bottom thereof for sliding connection with a slide groove provided on the upper surface of the first fixed frame 1; a pair of guide rods extend from the side of the friction block 112 and penetrate into the slider 111, and a spiral spring is sleeved on the guide rod as the elastic member 113; preferably, one end of the elastic member 113 is fixedly connected to the friction block 112, and the other end of the elastic member 113 is fixedly connected to the slider 111. The sliding direction of the slider 111, the sliding direction of the friction block 112, and the axial direction of the driving rod 114 are all in the same direction.

[0048] like Figure 3 As shown, the end of the friction block 112 has an arc-shaped recessed portion 1121 , and the arc-shaped recessed portion 1121 faces the peripheral surface of the friction disk 21 ; the diameter of the arc-shaped recessed portion 1121 should preferably be slightly larger than the diameter of the friction disk 21 .

[0049] In the above-mentioned friction device 11, the power unit 115 preferably adopts a reduction motor. The rotation of the power unit 115 drives the driving rod 114 to rotate. The rotation of the driving rod 114 drives the slider 111 to slide. The sliding of the slider 111 drives the helical spring as the elastic member 113 to compress or rebound. The elastic force of the elastic member 113 causes the friction block 112 to squeeze the friction disk 21, causing resistance to the rotation of the rotating frame 2, thereby simulating the actual operating conditions of the actuator to be tested. The number of rotations of the power unit 115 multiplied by the pitch of the driving rod 114 can obtain the accurate sliding distance of the slider 111. The sliding distance of the slider 111 multiplied by the stiffness coefficient of the elastic member 113 can accurately obtain the extrusion force applied by the friction block 112 to the friction disk 21. The extrusion force applied by the friction block 112 to the friction disk 21 multiplied by the friction coefficient can accurately obtain the friction force on the outer periphery of the friction disk 21. Therefore, by adopting the above-mentioned structure, the rotation angle of the power unit 115 can be adjusted to accurately adjust the resistance of the rotating frame 2 during rotation.

[0050] like Figure 1 As shown, the linear motion actuator life test equipment of this embodiment further includes a second fixed frame 4. Figure 4 As shown, the second fixed frame 4 has a plurality of electromagnetic generating components 41 on one side close to the rotating frame 2. Figure 5As shown, the rotating frame 2 has a plurality of magnetically attractable members 22 facing the electromagnetic generating member 41. Specifically, the magnetically attractable members 22 are long iron sheets; the upper, middle and lower parts of the rotating frame 2 are horizontally fixed with magnetically attractable members 22, and the side of the rotating frame 2 away from the friction disk 21 is fixed with a vertical magnetically attractable member 22; the electromagnetic generating member 41 is an electromagnet distributed along the magnetically attractable member 22.

[0051] Example 2

[0052] The linear motion actuator life test device provided in this embodiment is as follows Figure 6 As shown, the main difference between it and embodiment 1 lies in the specific structure of the bearing device 3 and the number and position of the friction devices 11.

[0053] like Figure 6 A linear motion actuator life test device shown in the figure includes a first fixed frame 1, a rotating frame 2 rotatably connected to the first fixed frame 1, and a bearing device 3 for fixing the actuator to be tested. The first fixed frame 1 is generally a vertical bracket, fixed to the ground or a base plate, and the first fixed frame 1 has multiple platforms for other components to be installed; the rotating frame 2 is generally in the shape of a door panel, and one side of the rotating frame 2 is hinged to the first fixed frame 1, and the hinged part is connected with a bearing to ensure smooth rotation of the rotating frame 2; the bearing device 3 is also fixed to the ground or the base plate. The bearing device 3 of this embodiment has lifting and rotation adjustment functions, and can simulate different application scenarios to meet diverse testing requirements. For example, in patent CN106761149A Figure 7 The application scenario shown is similar to that in patent CN114857828A Figure 1 The application scenarios shown are different. As the linear motion actuator moves, the angle changes and force changes between the push rod as the working component and the component pushed by the push rod are different.

[0054] like Figure 7 , Figure 8 , Fig. 9As shown, the bearing device 3 used in this embodiment includes a fixed vertical bracket 31, a pair of vertical lead screws 32 rotatably mounted on the vertical bracket 31, a lead screw motor 33 driving the vertical lead screw 32 to rotate, a lifting platform 34 screwed with the lead screw 32, an adjustment motor 35 fixed on the lifting platform 34, a worm 36 mounted on the output shaft of the adjustment motor 35, a rotating platform 37 rotatably connected to the lifting platform 34, and a worm wheel 38 coaxially connected to the rotating platform 37; the worm wheel 38 meshes with the worm 36. During the test, the actuator to be tested is fixed on the rotating platform 37, and the actuator to be tested is rotated and locked at a suitable angle by controlling the adjustment motor 35, and the actuator to be tested is lifted and locked at a suitable height by controlling the lead screw motor 33.

[0055] like Figure 2 As shown, a friction disc 21 is also installed at the rotating connection portion of the rotating frame 2, and the friction disc 21 rotates together with the rotating frame 2; a friction device 11 for controllably applying friction to the friction disc 21 is provided on the first fixed frame 1; when the actuator to be tested applies force to the rotating frame 2, the friction device 11 can apply friction to the friction disc 21 according to the required force application rules to simulate the actual operating conditions.

[0056] like Figure 2 As shown, the friction device 11 comprises a slider 111 slidably connected to the first fixed frame 1, a friction block 112 slidably connected to the slider 111, an elastic member 113 connected between the slider 111 and the friction block 112, a driving rod 114 threadedly connected to the slider 111, and a power unit 115 for driving the driving rod 114 to rotate. The slider 111 has a slide rail at the bottom thereof for sliding connection with a slide groove provided on the upper surface of the first fixed frame 1, and the friction block 112 also has a slide rail at the bottom thereof for sliding connection with a slide groove provided on the upper surface of the first fixed frame 1; a pair of guide rods extend from the side of the friction block 112 and penetrate into the slider 111, and a spiral spring is sleeved on the guide rod as the elastic member 113; preferably, one end of the elastic member 113 is fixedly connected to the friction block 112, and the other end of the elastic member 113 is fixedly connected to the slider 111. The sliding direction of the slider 111, the sliding direction of the friction block 112, and the axial direction of the driving rod 114 are all in the same direction.

[0057] like Figure 3 As shown, the end of the friction block 112 has an arc-shaped recessed portion 1121 , and the arc-shaped recessed portion 1121 faces the peripheral surface of the friction disk 21 ; the diameter of the arc-shaped recessed portion 1121 should preferably be slightly larger than the diameter of the friction disk 21 .

[0058] In the above-mentioned friction device 11, the power unit 115 preferably adopts a reduction motor. The rotation of the power unit 115 drives the driving rod 114 to rotate. The rotation of the driving rod 114 drives the slider 111 to slide. The sliding of the slider 111 drives the coil spring serving as the elastic member 113 to compress or rebound. The elastic force of the elastic member 113 causes the friction block 112 to squeeze the friction disk 21, causing resistance to the rotation of the rotating frame 2, thereby simulating the actual operating conditions of the actuator to be tested.

[0059] like Figure 7 As shown, the linear motion actuator life test equipment also includes a second fixed frame 4. Figure 4 As shown, the second fixed frame 4 has a plurality of electromagnetic generating components 41 on one side close to the rotating frame 2. Figure 5 As shown, the rotating frame 2 has a plurality of magnetically attractable members 22 facing the electromagnetic generating member 41. Specifically, the magnetically attractable members 22 are long iron sheets; the upper, middle and lower parts of the rotating frame 2 are horizontally fixed with magnetically attractable members 22, and the side of the rotating frame 2 away from the friction disk 21 is fixed with a vertical magnetically attractable member 22; the electromagnetic generating member 41 is an electromagnet distributed along the magnetically attractable member 22.

[0060] Example 3

[0061] A testing method is provided for testing the life of a linear motion actuator. The testing is performed using the linear motion actuator life testing device described in Example 1 or Example 2. The specific operation includes the following steps.

[0062] Step 1: Test the force of the actuator to be tested in the actual application scenario, and record the curve of the actual force change over time, which is recorded as the first force curve, such as Fig.10 shown.

[0063] Step 2: fix the actuator to be tested on the carrying device 3 so that the working component of the actuator to be tested acts on the rotating frame 2 .

[0064] Step three: supplying power to the electromagnetic generating element 41 so that it and the magnetically attractable element 22 are attracted to each other.

[0065] Step 4: Start the actuator to be tested to apply force to the rotating frame 2, and record the actual force variation curve over time, which is recorded as the second force curve, such as Fig.11 shown.

[0066] Step 5: Subtract the first force curve from the second force curve, and the resulting curve is recorded as the third force curve, such as Fig.12 shown.

[0067] Step 6: Multiply the third force curve by the correction factor K, and the resulting curve is recorded as the fourth force curve, such as Fig.13 As shown. The actual meaning of the correction factor K is as follows: Assuming that the extrusion force applied by the friction device 11 to the friction disc 21 is F1, correspondingly, the extrusion force between the rotating frame 2 and the working part of the actuator to be tested is F2; ​​then the correction factor K=F1 / F2. The actual value of the correction factor K can be calculated based on the distance between the contact position of the rotating frame 2 and the actuator to be tested to the rotation axis of the rotating frame 2, the radius of the friction disc 21, and the friction coefficient between the friction disc 21 and the friction block 112.

[0068] Step seven: Control the friction device 11 to apply extrusion force to the friction disc 21 according to the change rule of the fourth force curve, and supply power to the electromagnetic generator 41 according to the power supply size consistent with step three; run the actuator to be tested multiple times under this condition to evaluate the service life of the actuator to be tested. When the friction device 11 is controlled, the forces of the four force curves can be directly converted to the rotation angle of the power unit 115, thereby achieving precise control. The specific conversion method is as follows: multiply the number of rotations of the power unit 115 by the pitch of the drive rod 114 to obtain the sliding distance of the slider 111, and multiply the sliding distance of the slider 111 by the stiffness coefficient of the elastic member 113 to obtain the extrusion force applied by the friction block 112 to the friction disc 21.

[0069] In step 1 and step 4, the curve of actual force variation over time is recorded by setting a pressure sensor at the end of the working component of the actuator to be tested.

[0070] The test method of this embodiment is based on the actual measured force data. It is found that the force formed by overcoming the atmospheric pressure difference and the door seal resistance in the early stage of opening the refrigerator door is drastically changing and irregular. The force in the later stage of opening the refrigerator door is smaller than that in the early stage, but there is no obvious pattern. In view of the above situation, the test method of this embodiment sets an electromagnetic generating part 41 and a magnetically attractable part 22 between the second fixed frame 4 and the rotating frame 2, which can simulate the force condition in the early stage of opening the door to a large extent, and compensates the difference between the actual force and the electromagnetic force through the friction device 11, and this compensation is accurately compensated according to the difference curve, so it can objectively and accurately simulate the complex force change process of the actual working condition.

[0071] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with the technology in this field can understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A test method for testing the life of a linear motion actuator. Features: The following linear motion actuator life test equipment is used: comprising a first fixed frame (1) which is fixedly installed, a rotating frame (2) which is rotatably connected to the first fixed frame (1), and a bearing device (3) for fixing the actuator to be tested; the rotating frame (2) is provided with a friction disk (21) which rotates with the rotating frame (2); the first fixed frame (1) is provided with a friction device (11) which can controllably apply friction to the friction disk (21); when the actuator to be tested applies force to the rotating frame (2), the friction device (11) applies friction to the friction disk (21) according to a required force application rule; and further comprising a second fixed frame (4) which is fixedly installed; a side of the second fixed frame (4) close to the rotating frame (2) is provided with a plurality of electromagnetic generating components (41); the rotating frame (2) is provided with a plurality of magnetically attractable components (22) which are directly opposite to the electromagnetic generating components (41); The test method comprises the following steps: Step 1: Detect the force of the actuator to be tested in the actual application scenario, and record the curve of the actual force changing with time, which is recorded as the first force curve; Step 2: fixing the actuator to be tested on the carrying device (3) so that the working component of the actuator to be tested acts on the rotating frame (2); Step three: supplying power to the electromagnetic generating element (41) so that it and the magnetically attractable element (22) are attracted to each other; Step 4: starting the actuator to be tested to apply a force to the rotating frame (2), and recording a curve of actual force variation over time, which is recorded as a second force curve; Step 5: Subtract the first force curve from the second force curve, and the resulting curve is recorded as the third force curve; Step 6: multiplying the third force curve by the correction factor K, and the resulting curve is recorded as the fourth force curve; the extrusion force applied by the friction device (11) to the friction disk (21) is F1, and correspondingly, the extrusion force between the rotating frame (2) and the working component of the actuator to be tested is F2, and the correction factor K=F1 / F2; Step seven: Control the friction device (11) to apply a squeezing force to the friction disk (21) according to the variation rule of the fourth force curve, and supply power to the electromagnetic generator (41) according to the power supply size consistent with step three; under this condition, run the actuator to be tested multiple times to evaluate the service life of the actuator to be tested.

2. The test method according to claim 1, Features: The friction device (11) comprises a sliding block (111) slidably connected to the first fixing frame (1), a friction block (112) slidably connected to the sliding block (111), an elastic member (113) connected between the sliding block (111) and the friction block (112), a driving rod (114) threadedly connected to the sliding block (111), and a power unit (115) for driving the driving rod (114) to rotate; The friction block (112) presses the friction disk (21); the sliding direction of the sliding block (111), the sliding direction of the friction block (112), and the axial direction of the driving rod (114) are all in the same direction.

3. The test method according to claim 2, Features: The end of the friction block (112) has an arc-shaped recessed portion (1121), and the arc-shaped recessed portion (1121) faces the peripheral side surface of the friction disc (21).

4. The test method according to claim 3, Features: The elastic member (113) is a coil spring; one end of the elastic member (113) is fixedly connected to the friction block (112), and the other end of the elastic member (113) is fixedly connected to the sliding block (111).

5. The testing method according to claim 1, Features: The magnetically attractable member (22) is a long iron sheet; the upper, middle and lower parts of the rotating frame (2) are all laterally fixed with the magnetically attractable member (22); a side of the rotating frame (2) away from the friction disc (21) is fixed with a vertical magnetically attractable member (22); and the electromagnetic generating member (41) is an electromagnet distributed along the magnetically attractable member (22).

6. The test method according to any one of claims 1 to 4, Features: The bearing device (3) is a fixedly installed rigid bracket; the actuator to be tested is fixed on the rigid bracket.

7. The test method according to any one of claims 1 to 4, Features: The bearing device (3) comprises a fixedly mounted vertical bracket (31), a pair of vertical lead screws (32) rotatably mounted on the vertical bracket (31), a lead screw motor (33) driving the vertical lead screw (32) to rotate, a lifting platform (34) screw-matched with the vertical lead screw (32), an adjustment motor (35) fixed on the lifting platform (34), a worm (36) mounted on an output shaft of the adjustment motor (35), a rotating platform (37) rotatably connected to the lifting platform (34), and a worm wheel (38) coaxially connected to the rotating platform (37); the worm wheel (38) meshes with the worm (36).

8. The testing method according to claim 1, Features: In step 1 and step 4, the curve of actual force variation over time is recorded by setting a pressure sensor at the end of the working component of the actuator to be tested.

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