Limited angle motor displacement precision testing device and testing method

Abstract

The invention relates to a precision testing device and a precision testing method for displacement of a limited-angle motor. The device comprises a motor fixing device which is used for fixing a tested motor; the pressing device comprises a pressing piece capable of pressing the tested motor in the axial direction; the bayonet device comprises an axial driving assembly, a radial driving assembly connected with the axial driving assembly, an elastic pressing assembly connected with the radial driving assembly and a bayonet piece connected with the elastic pressing assembly, and the bayonet piece can be driven by the radial driving assembly to move in the radial direction so as to clamp an output shaft of the tested motor; the bayonet piece can be driven by the axial driving assembly to move in the axial direction to downwards press or upwards pull an output shaft of the tested motor, and the elastic pressing assembly is used for providing pressing force when the bayonet piece downwards presses or upwards pulls the output shaft; and the displacement acquisition device is used for acquiring the numerical value of the axial displacement. According to the invention, the test efficiency is improved, the consistency of each test condition can be ensured, and the reliability of a test result is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of motor detection devices, and in particular to a precision testing device and method for the movement amount of a limited-angle motor. Background Art

[0002] Different from the two-stage structure of traditional electro-hydraulic servo valves, the rotary direct-drive electro-hydraulic servo valve uses motor drive to replace the traditional servo valve pilot stage, and electrical feedback to replace mechanical feedback, which reduces problems such as many precision parts and difficult fault diagnosis, increases the shear force of the valve core, improves control accuracy, and further improves pollution resistance and reliability.

[0003] The reduction of precision parts can certainly reduce the capital investment in processing, but the use of motors also brings new problems. When the motor drives the output shaft to swing within a limited angle, and the hinge structure drives the valve core to move within a few millimeters of travel, the axial movement of the output shaft will have a huge impact, making the advantages of the motor disappear.

[0004] If the gap is too large, not only will the output force of the motor output shaft in the direction of the slide valve be reduced, affecting the control accuracy of the slide valve and seriously affecting the resolution, but it will also destroy the correct matching process of various parts. In a vibrating environment, it will greatly increase the risk of damage to parts such as magnetic steel and corrugated spring washers. If the gap is too small, the bearing clearance will be reduced, the rotation will be inflexible or even blocked, and sufficient torque cannot be output, which will reduce the shear force of the slide valve.

[0005] Therefore, it is necessary to adopt corresponding detection means to measure the motor axial clearance simply and accurately. For example, in the patent document CN201811601678, a small motor rotor axial clearance measuring device is disclosed. In order to avoid the error caused by the handheld micrometer measurement, a clamping mechanism is designed on the pressure rod to fix the rotor. The external motor and the micrometer are fixed on the base respectively. The pressure rod can swing up and down around the hinge point. The probe of the micrometer contacts the upper surface of the clamping mechanism. When the pressure rod swings up and down, the micrometer probe is triggered to display the measured axial clearance. However, this method does not take into account that after the motor is installed with a wave spring gasket, it will no longer be so easy to push the rotor from one end to the other.

[0006] Patent document CN202022947060 discloses a motor axial clearance detection device, in which the motor is fixed on the base, and there are slidable dynamometers on both sides. The clearance value is measured by pushing or pulling by hand through a micrometer fixed on the base. However, in this method, the pressure or pull of the rotor shaft needs to be applied manually, and the applied force is controlled by a person. The test results lack consistency and there are human errors. In addition, manual clamping and reading of values ​​are inefficient.

[0007] In the patent document CN202311688282, a motor axial clearance and shaft extension size detection device is designed, and a transmission device is added for transportation between the motor detection platform and the transmission mechanism. A separate mechanism clamps the motor output shaft and pulls it back and forth to detect the motor axial clearance. The length difference of the two measuring rods designed by it is the difference on the pressure sensor, so as to convert the clearance value of the motor output shaft. This method ensures the consistency of the applied axial force, but it detects the push and pull force through the pull pressure sensor, and multiple motor drives cooperate with each other. The principle is complicated and the capital investment is high. It is suitable for mass production of motors. In addition, the clearance value of this method is converted by the pressure difference detected by two pressure sensors. There are too many intermediate links, which makes the test results more influential. Summary of the invention

[0008] To this end, the present invention provides a limited angle motor running amount precision testing device and testing method, which not only improves the test efficiency, but also ensures the consistency of each test condition and ensures the reliability of the test results. In order to solve the above technical problems, the present invention provides a precision testing device for the movement of a limited-angle motor, comprising a workbench, on which are arranged: A motor fixing device, used to fix the motor under test; A clamping device, comprising a clamping member capable of axially clamping the motor under test; A bayonet device, movably arranged on a radial side of the motor under test, the bayonet device comprises an axial drive assembly, a radial drive assembly connected to the axial drive assembly, an elastic clamping assembly connected to the radial drive assembly, and a bayonet piece connected to the elastic clamping assembly, the bayonet piece can be driven by the radial drive assembly to move radially to clamp the output shaft of the motor under test, the bayonet piece can be driven by the axial drive assembly to move axially to press down or pull up the output shaft of the motor under test, so that the output shaft of the motor under test produces axial displacement, and the elastic clamping assembly is used to provide a clamping force for the bayonet piece when pressing down or pulling up the output shaft; The displacement acquisition device is used to acquire the value of the axial displacement.

[0009] In one embodiment of the present invention, the motor fixing device includes a positioning seat and a shell limiting member arranged on the positioning seat, the positioning seat is provided with a positioning groove suitable for positioning and placing the motor under test, and the shell limiting member is provided with an arc-shaped notch suitable for positioning and contacting with the side wall of the shell of the motor under test.

[0010] In one embodiment of the present invention, the motor fixing device also includes an output shaft radial limit assembly, and the output shaft radial limit assembly includes a limit seat, a telescopic rod and an adjusting locking piece. A bearing sliding cavity for radial sliding of the telescopic rod is arranged in the limit seat, and one end of the telescopic rod facing the cut surface of the output shaft of the motor under test is an arc surface and can abut against the cut surface. An adjusting groove is arranged on the upper part of the bearing sliding cavity, and the adjusting locking piece extends into the adjusting groove, passes through and is connected to the telescopic rod and abuts against the bottom wall of the bearing sliding cavity.

[0011] In one embodiment of the present invention, the adjusting locking member is a bolt, and the side wall of the bearing sliding cavity is provided with a universal ball in contact with the telescopic rod.

[0012] In one embodiment of the present invention, a transmission mechanism is also included, which includes a first radial guide rail installed on the workbench, a slide plate slidably connected to the first radial guide rail, and a first radial drive cylinder connected to the slide plate, and the positioning seat is installed on the slide plate.

[0013] In one embodiment of the present invention, the clamping device includes a pressing plate, a linear guide assembly installed on the workbench and a clamping cylinder, the driving end of the clamping cylinder is connected to the outer wall of the pressing plate, the pressing plate moves along the workbench through the linear guide assembly, and the linear guide assembly includes a linear guide rod and a guide sleeve slidably connected to the linear guide rod and connected to the pressing plate.

[0014] In one embodiment of the present invention, the displacement acquisition device includes a displacement sensor installed on the pressure plate, the clamping member includes a mounting flange and a cylindrical body installed on the inner wall of the pressure plate through the mounting flange, the axial end of the cylindrical body can be abutted against the housing flange surface of the motor under test and is radially provided with a clearance groove for the bayonet member to extend into, the end of the output shaft of the motor under test is provided with a spherical head for detection by the displacement sensor, and the bayonet member is provided with a slot that can be abutted against the spherical head.

[0015] In one embodiment of the present invention, the elastic pressing assembly includes a first mounting block, a second mounting block, a displacement seat, a guide rod and a sliding sleeve; wherein: The axial ends of the guide rod are respectively connected to the first mounting block and the second mounting block; The displacement seat is arranged between the first mounting block and the second mounting block and is provided with a mounting through hole, the sliding sleeve is installed on the displacement seat through the mounting through hole, and the sliding sleeve is arranged on the guide rod; The side walls at both axial ends of the sliding sleeve are respectively clamped with retaining springs that abut against the corresponding axial end faces of the displacement seat, and the bayonet piece is connected to the displacement seat; A spring seat, a spring and an adjusting bolt are arranged between the displacement seat and the first mounting block and the second mounting block; wherein the first mounting block and the second mounting block are both connected with the adjusting bolt, the spring seat is installed on the displacement seat, and the two ends of the spring are respectively abutted against the spring seat and the end of the adjusting bolt, and the compression amount of the spring can be adjusted by the adjusting bolt.

[0016] In one embodiment of the present invention, the axial drive assembly includes a mounting beam installed on the workbench, an axial guide rail installed on the mounting beam, a slider slidably connected to the axial guide rail, a slide table connected to the slider, and a screw assembly that drives the slider to slide, and the radial drive assembly includes a mounting seat installed on the slide table, a second radial slide rail and a second drive cylinder respectively installed on the mounting seat, and the second drive cylinder can drive the first mounting block or the second mounting block to slide along the second radial slide rail.

[0017] The present invention also provides an automated limited-angle motor drift precision testing method, using the automated limited-angle motor drift precision testing device, the method comprising: S1, fixing the motor under test in the motor fixing device, and transmitting the motor under test to a specified position through a transmission mechanism; S2, starting the radial drive assembly to drive the bayonet member to move radially to the radial position of the output shaft of the motor under test and to engage the output shaft of the motor under test; S3, pressing the motor under test axially by the pressing device; S4, starting the axial drive assembly to drive the bayonet member to press down the output shaft of the motor under test, and when the output shaft of the motor under test moves to the limit position, obtaining the lower limit value through the displacement acquisition device; The bayonet is driven to pull up the output shaft of the motor under test, and when the output shaft of the motor under test moves to the limit position, the upper limit value is obtained by the displacement obtaining device; S5. Obtain the axial movement of the output shaft of the motor under test according to the difference between the upper limit value and the lower limit value.

[0018] The above technical solution of the present invention has the following advantages compared with the prior art: The invention discloses a precise testing device and method for the limited-angle motor runaway, which achieves a high degree of automation in the testing process without the need for human intervention. The radial and axial movement of the bayonet parts are automatically controlled through radial and axial drive components, thus avoiding errors that may be introduced by manual force application. This not only improves the testing efficiency, but also ensures the consistency of the testing conditions each time, thus ensuring the reliability of the test results.

[0019] The present invention directly measures the axial displacement of the output shaft through a displacement sensor, and the measurement data is collected and processed in real time by a computer system. Compared with the traditional handheld micrometer or indirect calculation method, this method greatly improves the accuracy of displacement measurement. And after the upper and lower limit positions are fixed, the axial movement of the motor can be accurately and quickly obtained by calculating the difference of the displacement sensor values, avoiding the accuracy loss caused by indirect data calculation in the traditional method.

[0020] The clamping force of the test device of the present invention can be adjusted by the adjusting screw in the elastic clamping assembly, so as to adapt to limited-angle motors of different specifications and models. The spring compression amount is adjusted to set the appropriate clamping force, ensuring that the device can be applied to the axial displacement test of different series of products, which greatly improves the versatility and adaptability of the device.

[0021] The test device of the present invention has a reasonable structural design. Through reasonable layout, the motor fixing, bayonet, clamping and displacement measurement mechanisms are integrated on a workbench, which saves the space occupied by the device. At the same time, the use of standard guide rails, cylinders and other components reduces the manufacturing cost and equipment complexity, making the device compact and easy to maintain. This design simplifies the manufacturing process and makes maintenance and replacement of accessories more convenient in the event of failure or wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the precision testing device for the limited angle motor movement amount of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the motor fixing device and the transmission mechanism of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the radial limiting assembly of the motor output shaft of the present invention.

[0026] Figure 4 It is a structural schematic diagram of the clamping device of the present invention.

[0027] Figure 5 It is a structural schematic diagram of the elastic pressing component of the present invention.

[0028] Figure 6 It is a schematic diagram of the structure of the axial drive assembly and the radial drive assembly of the present invention.

[0029] Description of the Figures in the Specification: 100. workbench; 110. motor under test; 111. output shaft; 112. spherical head; 1. Motor fixing device; 11. Positioning seat; 12. Shell limiter; 13. Arc notch; 14. Output shaft radial limiter assembly; 15. Limiter seat; 16. Telescopic rod; 17. Adjustment locking member; 18. Bearing and sliding cavity; 181. Adjustment slot; 19. Universal ball bearing; 2. Clamping device; 21. Clamping piece; 211. Giving groove; 22. Pressing plate; 23. Clamping cylinder; 24. Linear guide rod; 25. Guide sleeve; 26. Mounting flange; 3. Bayonet device; 31. Axial drive assembly; 311. Mounting beam; 312. Axial guide rail; 313. Sliding block; 314. Slide table; 315. Lead screw assembly; 32. Radial drive assembly; 321. Mounting seat; 322. Second radial slide rail; 323. Second driving cylinder; 33. Elastic clamping assembly; 331. First mounting block; 332. Second mounting block; 333. Displacement seat; 334. Guide rod; 335. Sliding sleeve; 336. Circlip; 337. Spring seat; 338. Spring; 339. Adjusting bolt; 34. Bayonet piece; 4. Displacement acquisition device; 41. Displacement sensor; 5. Transmission mechanism; 51. First radial guide rail; 52. Slide plate; 53. First radial drive cylinder. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0031] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0032] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0034] Example 1 Reference Figure 1 As shown, a precision testing device for the limited-angle motor movement of the present invention includes a workbench 100, on which the following are arranged: A motor fixing device 1, used for fixing the motor 110 under test; A clamping device 2, comprising a clamping member 21 capable of axially clamping the motor 110 under test; A bayonet device 3 is movably arranged on a radial side of the motor 110 under test, and the bayonet device 3 includes an axial drive component 31, a radial drive component 32 connected to the axial drive component 31, an elastic clamping component 33 connected to the radial drive component 32, and a bayonet member 34 connected to the elastic clamping component 33. The bayonet member 34 can be driven by the radial drive component 32 to move radially to clamp the output shaft 111 of the motor 110 under test. The bayonet member 34 can be driven by the axial drive component 31 to move axially to press down or pull up the output shaft 111 of the motor 110 under test, so that the output shaft 111 of the motor 110 under test produces axial displacement. The elastic clamping component 33 is used to provide a clamping force (holding force) for the bayonet member 34 when pressing down or pulling up the output shaft 111. The displacement acquisition device 4 is used to acquire the value of the axial displacement.

[0035] In one embodiment, referring to Figure 2 As shown, the motor fixing device 1 includes a positioning seat 11 and a shell limiting member 12 arranged on the positioning seat 11, the positioning seat 11 is provided with a positioning groove suitable for positioning and placing the motor 110 under test, and the shell limiting member 12 is provided with an arc-shaped notch 13 suitable for positioning and contacting with the side wall of the shell of the motor 110 under test.

[0036] The positioning groove design ensures that the motor is stably placed, and the arc-shaped notch 13 precisely fits the side wall of the motor to prevent unnecessary movement of the motor during the test, which effectively ensures the position stability of the motor during the test, thereby improving the accuracy of the test results.

[0037] In one embodiment, referring to Figure 3 As shown, the motor fixing device 1 also includes an output shaft radial limit assembly 14, and the output shaft radial limit assembly 14 includes a limit seat 15, a telescopic rod 16 and an adjusting locking piece 17. A bearing sliding cavity 18 for radial sliding of the telescopic rod 16 is arranged in the limit seat 15, and one end of the telescopic rod 16 facing the cut surface of the output shaft 111 of the motor 110 under test is an arc surface and can abut against the cut surface, and an adjusting groove 181 is arranged on the upper part of the bearing sliding cavity 18, and the adjusting locking piece 17 extends into the adjusting groove 181, passes through and is connected to the telescopic rod 16, and abuts against the bottom wall of the bearing sliding cavity 18.

[0038] Specifically, the adjusting locking member 17 is a bolt, and the side wall of the bearing sliding cavity 18 is provided with a universal ball 19 in contact with the telescopic rod 16. The combination of the limiting seat 15, the telescopic rod 16 and the adjusting locking member 17 provides radial limiting for the motor output shaft 111, especially the arc surface of the telescopic rod 16 abuts against the cut surface of the motor, effectively avoiding the axis deviation. This structure not only enhances the stability of the test, but also ensures the consistent positioning of the output shaft 111 during the test.

[0039] In one embodiment, referring to Figure 3 As shown, it also includes a transmission mechanism 5, which includes a first radial guide rail 51 installed on the workbench 100, a slide plate 52 slidably connected to the first radial guide rail 51, and a first radial driving cylinder 53 connected to the slide plate 52, and the positioning seat 11 is installed on the slide plate 52.

[0040] Through the above arrangement, the motor 110 under test can be automatically transferred to a preset test position, thus avoiding deviation and inefficiency caused by manual handling.

[0041] In one embodiment, referring to Figure 1 , Figure 4 As shown, the clamping device 2 includes a pressing plate 22, a linear guide assembly installed on the workbench 100, and a clamping cylinder 23, the driving end of the clamping cylinder 23 is connected to the outer wall of the pressing plate 22, and the pressing plate 22 moves along the workbench 100 through the linear guide assembly. The linear guide assembly includes a linear guide rod 24 and a guide sleeve 25 slidably connected to the linear guide rod 24 and connected to the pressing plate 22.

[0042] Reference Figure 4As shown, the displacement acquisition device 4 includes a displacement sensor 41 installed on the pressure plate 22, the pressing member 21 includes a mounting flange 26 and a cylindrical body mounted on the inner wall of the pressure plate 22 through the mounting flange 26, the axial end of the cylindrical body can be abutted against the housing flange surface of the measured motor 110 and is radially provided with a clearance groove 211 for the bayonet member 34 to extend into, the end of the output shaft 111 of the measured motor 110 is provided with a spherical head 112 for detection by the displacement sensor 41, and the bayonet member 34 is provided with a slot that can abut against the spherical head 112. The measurement data collected by the displacement sensor 41 can be displayed in real time on the display screen of the host computer.

[0043] Reference Figure 5 As shown, the elastic pressing assembly 33 includes a first mounting block 331, a second mounting block 332, a displacement seat 333, a guide rod 334 and a sliding sleeve 335; wherein: the axial ends of the guide rod 334 are respectively connected to the first mounting block 331 and the second mounting block 332; the displacement seat 333 is arranged between the first mounting block 331 and the second mounting block 332 and is provided with a mounting through hole, the sliding sleeve 335 is installed on the displacement seat 333 through the mounting through hole, and the sliding sleeve 335 is arranged on the guide rod 334; the axial ends of the sliding sleeve 335 are respectively connected to the displacement seat 331 and the second mounting block 332. 33 corresponds to a retaining spring 336 that abuts against the axial end faces, and the bayonet piece 34 is connected to the displacement seat 333; a spring seat 337, a spring 338 and an adjusting bolt 339 are provided between the displacement seat 333 and the first mounting block 331 and the second mounting block 332; wherein the first mounting block 331 and the second mounting block 332 are both connected with the adjusting bolt 339, the spring seat 337 is installed on the displacement seat 333, and the two ends of the spring 338 are respectively abutted against the spring seat 337 and the end of the adjusting bolt 339, and the compression amount of the spring 338 can be adjusted by the adjusting bolt 339.

[0044] The elastic clamping assembly 33 includes a mounting block, a displacement seat 333, a guide rod 334, and a spring 338, so that the clamping force remains constant within the elastic range. The compression amount of the spring 338 can be accurately controlled by adjusting the bolt 339 to ensure that the upper and lower displacements of the output shaft 111 are uniform during the test, thereby avoiding test errors caused by inconsistent clamping force. The adjustability and stability of this design enable the device to achieve stable testing under different force requirements, ensuring the accuracy of the measurement.

[0045] It is understandable that it is difficult to ensure the stability of the motor output shaft 111 at the upper and lower limit positions by relying solely on the push-pull force provided by the lead screw assembly 315 (axial drive assembly 31). This is because when the lead screw assembly 315 (or other components) approaches the limit position, it may not be able to stay accurately at the ideal position due to mechanical clearance, inertia or changes in the driving force of the lead screw itself, thereby affecting the accuracy and repeatability of the measurement.

[0046] By providing an elastic clamping assembly 33, a buffer and adaptive clamping force can be provided when the output shaft 111 approaches the upper and lower limit positions. The two springs 338 in the assembly will gradually increase the clamping force when the output shaft 111 approaches the upper and lower limit positions, reducing the vibration or position instability caused by inertia. In addition, the buffering force of the elastic clamping assembly 33 can also compensate for the deficiencies of the axial drive assembly 31 in micro-force control, so that the output shaft 111 gradually tends to stabilize at the limit position, and will not deviate from the precise position due to mechanical jitter or excessive stopping impact force. This stable limit position stay effect is the prerequisite for accurately measuring the difference between the upper and lower displacements.

[0047] Therefore, the introduction of the elastic clamping assembly 33 not only makes up for the shortcomings of the screw assembly 315 in the extreme position control, but also improves the stability of the output shaft 111 at the extreme position during the test, ensuring the reliability of the measurement; at the same time, it ensures the consistency of the applied clamping force and the upper pulling force, ensuring the consistency of the test results of different motors.

[0048] In one embodiment, referring to Figure 6 As shown, the axial drive assembly 31 includes a mounting beam 311 installed on the workbench 100, an axial guide rail 312 installed on the mounting beam 311, a slider 313 slidably connected to the axial guide rail 312, a slide 314 connected to the slider 313, and a screw assembly 315 driving the slider 313 to slide, and the radial drive assembly 32 includes a mounting seat 321 installed on the slide 314, a second radial slide rail 322 and a second drive cylinder 323 respectively installed on the mounting seat 321, and the second drive cylinder 323 can drive the first mounting block 331 or the second mounting block 332 to slide along the second radial slide rail 322.

[0049] The up and down movement of the bayonet fixture is automatically controlled by a ball screw mechanism, and the up and down push and pull forces during the test can be automatically completed under program control (PLC). The bayonet fixture is installed on the fixture pressure plate 22 through an elastic component, which can not only provide a stable push and pull force, but also control the appropriate clamping force by adjusting the screw to ensure that motors of different specifications can be adapted. The entire process avoids the inconsistency that may be caused by manual force application, ensures that the test operation is highly consistent, the results are stable and reliable, and further improves the test efficiency.

[0050] The combined design of the radial slide rail and the driving cylinder ensures accurate control of the bayonet 34 in the radial and axial directions. The cooperation between the second radial slide rail 322 and the driving cylinder enables the bayonet 34 to move accurately in both the axial and radial directions. The consistency and accuracy of each positioning is maintained in repeated tests, which greatly reduces the deviation caused by multiple tests and improves the reliability and test accuracy of the device.

[0051] Example 2 The present invention also provides an automated limited-angle motor drift precision testing method, using the automated limited-angle motor drift precision testing device, the method comprising: S1, fixing the motor under test 110 in the motor fixing device 1, and transmitting the motor under test 110 to a designated position through a transmission mechanism 5.

[0052] Specifically, the motor 110 to be tested is fixed in the motor fixing device 1 to ensure that the motor is firmly placed in the positioning groove 111, and the housing limiter 12 is in close contact with the side wall of the motor housing to avoid radial movement. The output shaft 111 of the motor is limited by the output shaft radial limiter assembly 14 to ensure that the axis position is stable during the test.

[0053] S2, starting the radial drive assembly 32 to drive the clamping member 34 to move radially to the radial position of the output shaft 111 of the motor 110 under test and clamp the output shaft 111 of the motor 110 under test.

[0054] S3, the motor 110 to be tested is compressed axially by the compression device 2. Specifically, the compression cylinder 23 of the compression device 2 activates the compression plate 22 to press down, ensuring that the end of the cylindrical body of the compression member 21 abuts against the flange surface of the motor housing.

[0055] S4, starting the axial drive assembly 31, driving the bayonet member 34 to press down the output shaft 111 of the motor 110 under test, and when the output shaft 111 of the motor 110 under test moves to the limit position, obtaining the lower limit value through the displacement acquisition device 4; The bayonet member 34 is driven to pull up the output shaft 111 of the motor 110 under test. When the output shaft 111 of the motor 110 under test moves to the limit position, the upper limit value is obtained by the displacement acquisition device 4 .

[0056] Specifically, the screw assembly 315 starts to drive the tooling plate 22 to move downward, and presses the output shaft 111 of the motor 110 to generate axial displacement through the bayonet 34. When the output shaft 111 moves to the limit position, the displacement sensor 41 records and fixes the lower limit value, indicating that the axial displacement stops.

[0057] When it is detected that the value of the displacement sensor 41 no longer changes, the screw assembly 315 stops pressing down. Subsequently, the screw assembly 315 moves in the opposite direction, and the pressure plate 22 moves upward, while pulling up and driving the output shaft 111 of the motor 110 under test to move upward through the bayonet member 34. The pressure plate 22 continues to move upward, and the bayonet member 34 drives the output shaft 111 of the motor 110 under test to rise axially through the elastic clamping assembly 33. When the output shaft 111 of the motor 110 under test reaches the upper limit position, the displacement sensor 41 fixes the upper limit value.

[0058] It should be noted that when replacing a different model of the motor to be tested, the upper and lower limit values ​​of the stroke of the screw assembly 315 should be calibrated according to the different heights of the output shaft 111, and the stroke of the screw assembly 315 should be adjusted to be greater than the upper and lower limit values ​​of the output shaft 111. When determining the starting position and stroke of the movement of the screw assembly 315, it is stipulated that the bayonet fixture in the free state can just clamp the motor output shaft 111 in the free state (or other reference objects, a certain model remains unchanged after the origin is determined to ensure subsequent consistency) as the starting position of the screw assembly 315; the prescribed stroke is 50% of the movement stroke of the bayonet fixture on the screw assembly 315, with the starting position as the center, 25% up, and 25% down (the appropriate compression amount of the spring 338 can be calculated according to the required clamping force).

[0059] S5. According to the difference between the upper limit value and the lower limit value, the axial play of the output shaft 111 of the motor 110 under test is obtained, and the calculated play is output through a display.

[0060] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A precision test device for the movement of a limited-angle motor, characterized in that: It comprises a workbench (100), on which is arranged: A motor fixing device (1), used for fixing the motor to be tested (110); A pressing device (2), comprising a pressing member (21) capable of pressing the motor (110) under test in the axial direction; A bayonet device (3) is movably arranged on a radial side of the motor (110) under test, the bayonet device (3) comprising an axial drive component (31), a radial drive component (32) connected to the axial drive component (31), an elastic clamping component (33) connected to the radial drive component (32), and a bayonet member (34) connected to the elastic clamping component (33), the bayonet member (34) being able to be driven by the radial drive component (32) to move radially so as to clamp the output shaft (111) of the motor (110) under test, the bayonet member (34) being able to be driven by the axial drive component (31) to move axially so as to press down or pull up the output shaft (111) of the motor (110) under test, so as to cause the output shaft (111) of the motor (110) under test to generate an axial displacement, and the elastic clamping component (33) is used to provide a clamping force for the bayonet member (34) when pressing down or pulling up the output shaft (111); The displacement acquisition device (4) is used to acquire the value of the axial displacement.

2. According to claim 1, a precision test device for the limited angle motor movement, characterized in that: The motor fixing device (1) comprises a positioning seat (11) and a housing stopper (12) arranged on the positioning seat (11); the positioning seat (11) is provided with a positioning groove suitable for positioning and placing the motor (110) under test; and the housing stopper (12) is provided with an arc-shaped notch (13) suitable for positioning and contacting with a side wall of a housing of the motor (110) under test.

3. The device for accurately testing the movement of a limited-angle motor according to claim 2, characterized in that: The motor fixing device (1) further comprises an output shaft radial limit assembly (14), the output shaft radial limit assembly (14) comprising a limit seat (15), a telescopic rod (16) and an adjustment locking member (17); a bearing sliding cavity (18) for radial sliding of the telescopic rod (16) is arranged in the limit seat (15); one end of the telescopic rod (16) facing the cut surface of the output shaft (111) of the motor (110) to be tested is an arc surface and can abut against the cut surface; an adjustment groove (181) is arranged at the upper part of the bearing sliding cavity (18); the adjustment locking member (17) extends into the adjustment groove (181), penetrates and is connected to the telescopic rod (16) and abuts against the bottom wall of the bearing sliding cavity (18).

4. The device for accurately testing the movement of a limited-angle motor according to claim 3, characterized in that: The adjusting locking member (17) is a bolt, and the side wall of the bearing sliding cavity (18) is provided with a universal ball (19) in contact with the telescopic rod (16).

5. The device for accurately testing the movement of a limited-angle motor according to claim 2, characterized in that: The invention also comprises a transmission mechanism (5), wherein the transmission mechanism (5) comprises a first radial guide rail (51) mounted on the workbench (100), a slide plate (52) slidably connected to the first radial guide rail (51), and a first radial driving cylinder (53) connected to the slide plate (52), and the positioning seat (11) is mounted on the slide plate (52).

6. The device for accurately testing the movement of a limited-angle motor according to claim 1, characterized in that: The clamping device (2) comprises a clamping plate (22), a linear guide assembly mounted on the workbench (100) and a clamping cylinder (23), wherein the driving end of the clamping cylinder (23) is connected to the outer wall of the clamping plate (22), and the clamping plate (22) moves along the workbench (100) via the linear guide assembly, and the linear guide assembly comprises a linear guide rod (24) and a guide sleeve (25) slidably connected to the linear guide rod (24) and connected to the clamping plate (22).

7. The device for accurately testing the movement of a limited-angle motor according to claim 6, characterized in that: The displacement acquisition device (4) comprises a displacement sensor (41) mounted on the pressure plate (22); the pressing member (21) comprises a mounting flange (26) and a cylindrical body mounted on the inner side wall of the pressure plate (22) via the mounting flange (26); the axial end of the cylindrical body can abut against the housing flange surface of the motor (110) to be tested and is radially provided with a clearance groove (211) for the bayonet member (34) to extend therein; the detection rod of the displacement sensor (41) can axially extend into the interior of the cylindrical body; the end of the output shaft (111) of the motor (110) to be tested is provided with a spherical head (112) for detection by the displacement sensor (41); and the bayonet member (34) is provided with a slot capable of abutting against the spherical head (112).

8. The device for accurately testing the movement of a limited-angle motor according to claim 1, characterized in that: The elastic pressing assembly (33) comprises a first mounting block (331), a second mounting block (332), a displacement seat (333), a guide rod (334) and a sliding sleeve (335); wherein: The guide rod (334) has two axial ends connected to the first mounting block (331) and the second mounting block (332) respectively; The displacement seat (333) is arranged between the first mounting block (331) and the second mounting block (332) and is provided with a mounting through hole, the sliding sleeve (335) is installed on the displacement seat (333) through the mounting through hole, and the sliding sleeve (335) is arranged on the guide rod (334); The side walls at both axial ends of the sliding sleeve (335) are respectively clamped with clamping springs (336) that abut against the corresponding axial end surfaces of the displacement seat (333), and the bayonet member (34) is connected to the displacement seat (333); A spring seat (337), a spring (338) and an adjusting bolt (339) are arranged between the displacement seat (333) and the first mounting block (331) and the second mounting block (332); wherein the first mounting block (331) and the second mounting block (332) are both connected to the adjusting bolt (339), the spring seat (337) is mounted on the displacement seat (333), two ends of the spring (338) are respectively abutted against the spring seat (337) and the end of the adjusting bolt (339), and the compression amount of the spring (338) can be adjusted by the adjusting bolt (339).

9. The device for accurately testing the movement of a limited-angle motor according to claim 8, characterized in that: The axial drive assembly (31) comprises a mounting beam (311) mounted on the workbench (100), an axial guide rail (312) mounted on the mounting beam (311), a slider (313) slidably connected to the axial guide rail (312), a slide table (314) connected to the slider (313), and a screw assembly (315) for driving the slider (313) to slide. The radial drive assembly (32) comprises a mounting seat (321) mounted on the slide table (314), a second radial slide rail (322) and a second drive cylinder (323) respectively mounted on the mounting seat (321). The second drive cylinder (323) is capable of driving the first mounting block (331) or the second mounting block (332) to slide along the second radial slide rail (322).

10. An automated method for precisely testing the amount of motion of a limited-angle motor, characterized in that: Using the automated limited-angle motor runaway precision testing device according to any one of claims 1 to 9, the method comprises: S1, fixing the motor under test (110) in the motor fixing device (1); and transmitting the motor under test (110) to a designated position via the transmission mechanism (5); S2, starting the radial drive assembly (32), driving the bayonet member (34) to move radially to a radial position of an output shaft (111) of the motor under test (110) and to engage the output shaft (111) of the motor under test (110); S3, pressing the motor (110) to be tested along the axial direction by means of the pressing device (2); S4, starting the axial drive assembly (31), driving the bayonet member (34) to press down the output shaft (111) of the motor under test (110), and when the output shaft (111) of the motor under test (110) moves to the limit position, obtaining a lower limit value through the displacement obtaining device (4); driving the bayonet member (34) to pull up the output shaft (111) of the motor under test (110), and when the output shaft (111) of the motor under test (110) moves to an extreme position, obtaining an upper limit value through the displacement obtaining device (4); S5. Obtaining the axial movement amount of the output shaft (111) of the motor (110) under test according to the difference between the upper limit value and the lower limit value.

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