A test fixture for servo motor aging tests

Abstract

This invention belongs to the field of motor testing technology, specifically relating to a test frame for servo motor aging tests. It includes a support base, a partition plate fixedly connected to the support base, a through slot on the partition plate, a lifting mechanism installed within the slot, and a lower support plate fixedly connected to the moving end of the lifting mechanism for supporting the motor under test. A clamping mechanism is installed on one side of the support base near the through slot, and a support plate is installed on the side of the support base away from the clamping mechanism. A coupling unit is installed on the support plate, and a support frame is fixedly connected to the support base. A drive shaft is rotatably mounted on the support frame. The purpose is to automatically clamp the motor and install the coupling after the motor under test is placed on the lower support plate through the coordinated operation of the lifting mechanism, lower support plate, clamping mechanism, and coupling unit, making the assembly and disassembly of the motor under test more convenient and thus improving testing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of motor testing technology, specifically relating to a test fixture for servo motor aging tests. Background Technology

[0002] Servo motors are a common actuator in automatic control systems. They enable highly accurate control of speed and position, converting voltage signals into torque and speed to drive the controlled object. To ensure quality, servo motors undergo aging tests before leaving the factory.

[0003] In the existing servo motor testing process, the motor under test and the hysteresis brake are respectively mounted on the test platform. The output shaft of the motor under test is connected to the sensor and the hysteresis brake in sequence through a coupling. After the motor under test is powered on, it rotates for a long time. The load is adjusted by the hysteresis brake, and various electrical parameters are measured by the sensor.

[0004] During the testing process, the motor and coupling under test need to be manually installed and removed, which makes it inconvenient to disassemble and install the motor under test and affects the testing efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a test frame for servo motor aging tests. Through the cooperation of the lifting mechanism, the lower support plate, the clamping mechanism, and the coupling unit, the motor under test can be placed on the lower support plate, and the clamping of the motor and the installation of the coupling can be completed automatically, making the disassembly and assembly of the motor under test more convenient, thereby improving the testing efficiency.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A test fixture for servo motor aging tests includes a support base, a partition plate fixedly connected to the support base, a through groove on the partition plate, a vertical mounting groove on the inner side of the through groove, a lifting mechanism installed in the mounting groove, a lower support plate for supporting the motor under test fixedly connected to the moving end of the lifting mechanism, a clamping mechanism installed on one side of the support base in the through groove, a support plate installed on the side of the support base away from the clamping mechanism, a coupling unit installed on the support plate, a support frame fixedly connected to the support base, and a drive shaft rotatably mounted on the support frame. The drive shaft, the output shaft of the motor under test, and the central axis of the coupling unit are collinear. A sensor unit for testing the motor under test and a load unit for providing load are installed on the drive shaft.

[0008] Further defined, the lifting mechanism includes a first lead screw and a second lead screw, both of which are rotatably mounted in the mounting groove. The center lines of the first lead screw and the second lead screw are collinear and their threads rotate in opposite directions. A drive motor is fixedly connected to the support base. The output shaft of the drive motor is threadedly connected to the second lead screw. A first slider is screwed onto the first lead screw, and a second slider is screwed onto the second lead screw.

[0009] Further specifying, the lower support plate includes a first V-shaped plate, which is fixedly connected to a first slider. An L-shaped rod is fixedly connected to the lower end of the first V-shaped plate. A first guide groove is formed below the motor under test on the L-shaped rod. A T-shaped plate is slidably mounted within the first guide groove on the L-shaped rod. A first compression spring is provided below the T-shaped plate in the first guide groove. A second V-shaped plate is fixedly connected to the second slider. The first and second V-shaped plates are symmetrically arranged about the central axis of the transmission shaft. This structural design, through the mutual cooperation of the first lead screw, the second lead screw, the first V-shaped plate, the second V-shaped plate, and the T-shaped plate, places the motor under test above the T-shaped plate. The output shaft of the motor under test is located between the first and second V-shaped plates and tilted upwards. The first and second V-shaped plates clamp the output shaft of the motor under test. At this time, the output shaft of the motor under test is collinear with the central axis of the transmission shaft, allowing the device to adapt to various types of servo motors.

[0010] Furthermore, a sliding groove is formed on the side of the through groove away from the mounting groove. The first V-shaped plate is fixedly connected to a first plate body within the sliding groove, and the second V-shaped plate is fixedly connected to a second plate body within the sliding groove. This structural design, through the guidance of the first and second plate bodies, prevents the first and second V-shaped plates from tilting under stress, thus reducing the service life of the slider.

[0011] Further specifying, the support plate includes a plate body and a rotating rod. The rotating rod is rotatably mounted on a support base, and an adjusting motor is mounted on the support base. The output shaft of the adjusting motor is drively connected to the rotating rod. The plate body is fixedly mounted on the rotating rod. The plate body has multiple stepped holes circumferentially opened, and the coupling unit is installed in the stepped holes. This structural design allows for the installation of different specifications of coupling units in different stepped holes, depending on the type of motor being tested. The adjusting motor can be used to switch between these units, making it suitable for various models of servo motors.

[0012] Further specified, the inner wall of the stepped hole has a limiting groove. The coupling unit includes a connecting key, a rod, and an insertion block. The rod is rotatably installed in the stepped hole. The connecting key is fixedly connected to the end of the rod near the motor under test. The insertion block is fixedly connected to the end of the rod near the drive shaft. The rod is fixedly connected to the limiting block in the limiting groove. The end of the drive shaft near the support plate has a second guide groove. A top block is slidably installed on the drive shaft in the second guide groove. A second compression spring is laterally arranged between the top block and the drive shaft in the second guide groove. With this structural design, when the clamping mechanism clamps the motor under test, the connecting key is engaged in the keyway of the output shaft, the limiting block disengages from the limiting groove, and the insertion block is inserted into the second guide groove, automatically completing the installation of the coupling. When the motor under test is removed, the elasticity of the second compression spring pushes the insertion block and the limiting block back to their original positions, completing the automatic return of the coupling unit for easy installation next time.

[0013] Furthermore, the clamping mechanism is a cylinder.

[0014] Furthermore, the load unit employs a hysteresis brake.

[0015] The invention employing the above technical solution has the following advantages:

[0016] 1. Through the cooperation of the lifting mechanism, lower support plate, clamping mechanism and coupling unit, after the motor under test is placed on the lower support plate, the clamping of the motor and the installation of the coupling can be completed automatically, making the disassembly and assembly of the motor under test more convenient, thereby improving the testing efficiency.

[0017] 2. Through the cooperation of the first lead screw, the second lead screw, the first V-shaped plate, the second V-shaped plate, and the T-shaped plate, the motor under test is placed above the T-shaped plate. The output shaft of the motor under test is located between the first V-shaped plate and the second V-shaped plate and tilted upwards. The first V-shaped plate and the second V-shaped plate clamp the output shaft of the motor under test. At this time, the output shaft of the motor under test is collinear with the central axis of the transmission shaft, so that the device can adapt to various models of servo motors.

[0018] 3. Depending on the type of motor being tested, different specifications of coupling units can be installed in different stepped holes, and the motor can be adjusted to switch between them, which can adapt to various models of servo motors.

[0019] 4. When the clamping mechanism clamps the motor under test, the connecting key is engaged in the keyway of the output shaft, the limiting block disengages from the limiting groove, and the insertion block is inserted into the second guide groove, automatically completing the installation of the coupling. Due to the elasticity of the second compression spring, it can adapt to different lengths of output shafts within a certain range. When the motor under test is removed, due to the elasticity of the second compression spring, the insertion block and the limiting block are pushed back to their original positions, completing the automatic return of the coupling unit, which is convenient for the next installation. Attached Figure Description

[0020] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0021] Figure 1 This is a schematic diagram of a test fixture embodiment for servo motor aging tests according to the present invention;

[0022] Figure 2 This is a cross-sectional view of an embodiment of a test fixture for servo motor aging tests according to the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of the structure at point A;

[0024] Figure 4 This is a schematic diagram of a test fixture without a test motor in an embodiment of the present invention for servo motor aging test;

[0025] Figure 5 This is a schematic diagram of the structure of a test fixture for servo motor aging test according to an embodiment of the present invention;

[0026] The symbols for the main components are explained below:

[0027] Support base 1, partition 11, clamping mechanism 12, support frame 13, drive shaft 14, second guide groove 141, top block 142, second compression spring 143, sensor unit 15, load unit 16, slide 17.

[0028] Lifting mechanism 2, first lead screw 21, second lead screw 22, drive motor 23, first slider 24, second slider 25

[0029] Motor under test 3

[0030] Lower support plate 4, first V-shaped plate 41, first plate body 411, L-shaped rod 42, first guide groove 43, T-shaped plate 44, first compression spring 45, second V-shaped plate 46, second plate body 461

[0031] Support plate 5, plate body 51, rotating rod 52, adjusting motor 53, stepped hole 54, limit groove 55

[0032] Coupling unit 6, connecting key 61, rod 62, insertion block 63, limit block 64. Detailed Implementation

[0033] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In addition, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0034] like Figures 1-5 As shown, a test frame for servo motor aging tests according to the present invention includes a support base 1, a partition 11 fixedly connected to the support base 1, a through groove on the partition 11, and a mounting groove vertically opened inside the through groove. A lifting mechanism 2 is installed in the mounting groove. A lower support plate 4 for supporting the motor under test 3 is fixedly connected to the moving end of the lifting mechanism 2. A clamping mechanism 12 is installed on one side of the through groove of the support base 1. A support plate 5 is installed on the side of the through groove of the support base 1 away from the clamping mechanism 12. A coupling unit 6 is installed on the support plate 5. A support frame 13 is fixedly connected to the support base 1. A transmission shaft 14 is rotatably installed on the support frame 13. The transmission shaft 14, the output shaft of the motor under test 3, and the central axis of the coupling unit 6 are collinear. A sensor unit 15 for testing the motor under test 3 and a load unit 16 for providing load are installed on the transmission shaft 14. The clamping mechanism 12 is a cylinder, and the moving end of the cylinder is connected to a top plate. The load unit 16 is a hysteresis brake.

[0035] The lifting mechanism 2 includes a first lead screw 21 and a second lead screw 22. Both the first lead screw 21 and the second lead screw 22 are rotatably mounted in the mounting groove. The center lines of the first lead screw 21 and the second lead screw 22 are collinear and their threads are in opposite directions. A drive motor 23 is fixedly connected to the support base 1. The output shaft of the drive motor 23 is threadedly connected to the second lead screw 22. A first slider 24 is screwed onto the first lead screw 21 and a second slider 25 is screwed onto the second lead screw 22.

[0036] The lower support plate 4 includes a first V-shaped plate 41, which is fixedly connected to the first slider 24. An L-shaped rod 42 is fixedly connected to the lower end of the first V-shaped plate 41. A first guide groove 43 is provided on the L-shaped rod 42 below the motor 3 under test. A T-shaped plate 44 is slidably installed on the L-shaped rod 42 in the first guide groove 43. A first compression spring 45 is provided below the T-shaped plate 44 in the first guide groove 43. A second V-shaped plate 46 is fixedly connected to the second slider 25. The first V-shaped plate 41 and the second V-shaped plate 46 are symmetrically arranged about the central axis of the transmission shaft 14. Through the cooperation of the first lead screw 21, the second lead screw 22, the first V-shaped plate 41, the second V-shaped plate 46, and the T-shaped plate 44, the motor under test 3 is placed above the T-shaped plate 44. The output shaft of the motor under test 3 is located between the first V-shaped plate 41 and the second V-shaped plate 46 and is tilted upward. The first V-shaped plate 41 and the second V-shaped plate 46 clamp the output shaft of the motor under test 3. At this time, the output shaft of the motor under test 3 is collinear with the central axis of the transmission shaft 14, so that the device can adapt to various models of servo motors.

[0037] A sliding groove 17 is provided on the side of the through groove away from the mounting groove. A first V-shaped plate 41 is fixedly connected to a first plate body 411 within the sliding groove 17, and a second V-shaped plate 46 is fixedly connected to a second plate body 461 within the sliding groove 17. The first plate body 411 and the second plate body 461 provide guidance, preventing the first V-shaped plate 41 and the second V-shaped plate 46 from tilting under stress, thus reducing the service life of the slider.

[0038] In this embodiment, pressure sensors are installed on the clamping mechanism 12 and the second V-shaped plate 46 to control the start and stop of the cylinder and the drive motor 23, thereby preventing damage to the equipment.

[0039] The support plate 5 includes a plate body 51 and a rotating rod 52. The rotating rod 52 is rotatably mounted on a support base 1. An adjusting motor 53 is mounted on the support base 1. The output shaft of the adjusting motor 53 is connected to the rotating rod 52. The plate body 51 is fixedly mounted on the rotating rod 52. The plate body 51 has multiple stepped holes 54 circumferentially opened, and coupling units 6 are installed in the stepped holes 54. Depending on the type of motor 3 being tested, different specifications of coupling units 6 can be installed in different stepped holes 54, and can be switched using the adjusting motor 53, thus adapting to various models of servo motors.

[0040] A limiting groove 55 is provided on the inner wall of the stepped hole 54. The coupling unit 6 includes a connecting key 61, a rod 62 and an insertion block 63. The rod 62 is rotatably installed in the stepped hole 54. The connecting key 61 is fixedly connected to the end of the rod 62 near the motor 3 under test. The insertion block 63 is fixedly connected to the end of the rod 62 near the drive shaft 14. A limiting block 64 is fixedly connected to the rod 62 in the limiting groove 55. A second guide groove 141 is provided at the end of the drive shaft 14 near the support plate 5. A top block 142 is slidably installed on the drive shaft 14 in the second guide groove 141. A second compression spring 143 is transversely arranged between the top block 142 and the drive shaft 14 in the second guide groove 141. When the clamping mechanism 12 clamps the motor 3 under test, the connecting key 61 is inserted into the keyway of the output shaft, the limiting block 64 is disengaged from the limiting groove 55, and the insertion block 63 is inserted into the second guide groove 141, thus automatically completing the installation of the coupling. When the motor 3 under test is removed, due to the elasticity of the second compression spring 143, the insertion block 63 and the limiting block 64 are pushed back to their original positions, thus completing the automatic return of the coupling unit 6, which is convenient for the next installation.

[0041] In this embodiment, different connection keys 61 are designed according to the length of the output and the type of keyway.

[0042] The usage method and principle of this embodiment are as follows:

[0043] According to the model of the motor 3 under test, the corresponding coupling unit 6 is selected through the disc 51. The top plate in the clamping mechanism 12 moves to above the T-shaped plate 44 under the drive of the cylinder.

[0044] The motor under test 3 is placed on the T-shaped plate 44, and the output shaft of the motor under test 3 is placed between the first V-shaped plate 41 and the second V-shaped plate 46. At this time, the distance between the first V-shaped plate 41 and the second V-shaped plate 46 is relatively large, and because the first compression spring 45 is provided below the T-shaped plate 44, the motor under test 3 will tilt and be blocked by the top plate, and will not slip.

[0045] Start the drive motor 23, which drives the first lead screw 21 and the second lead screw 22 to rotate, causing the first V-shaped plate 41 and the second V-shaped plate 46 to come together, causing the L-shaped plate to drive the T-shaped plate 44 to rise until the central axis of the output shaft is collinear with the central axis of the transmission shaft 14. Due to the first compression spring 45 and the T-shaped plate 44, when the tested motor 3 changes from tilt to horizontal, a certain support force is increased to prevent the output shaft from being subjected to excessive force and causing damage.

[0046] The cylinder pushes the top plate, pressing the motor 3 under test onto the partition 11, and the drive motor 23 starts again, releasing the first V-shaped plate 41 and the second V-shaped plate 46.

[0047] During the clamping process, the connecting key 61 is inserted into the keyway of the output shaft, the limiting block 64 is disengaged from the limiting groove 55, and the insertion block 63 is inserted into the second guide groove 141, thus automatically completing the installation of the coupling. Due to the elasticity of the second compression spring 143, it can adapt to output shafts of different lengths within a certain range.

[0048] After the coupling is installed, the load is adjusted, the servo motor is powered on for testing, and the speed and torque changes of the servo motor after long-term operation are detected by sensor unit 15.

[0049] After the test is completed, the cylinder of the clamping mechanism 12 retracts, and the tested motor 3 is manually pulled out. Due to the elasticity of the second compression spring 143, the insertion block 63 and the limiting block 64 are pushed back to their original positions, completing the automatic return of the coupling unit 6, which is convenient for the next installation.

[0050] The above provides a detailed description of a test fixture for servo motor aging tests provided by the present invention. The specific embodiments described are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A test fixture for servo motor aging tests, characterized in that: The system includes a support base (1), on which a partition plate (11) is fixedly connected. A through groove is formed on the partition plate (11), and a mounting groove is vertically formed inside the through groove. A lifting mechanism (2) is installed in the mounting groove. A lower support plate (4) for supporting the motor (3) under test is fixedly connected to the moving end of the lifting mechanism (2). A clamping mechanism (12) is installed on one side of the through groove on the support base (1), and a support plate (5) is installed on the side of the through groove away from the clamping mechanism (12) on the support base (1). A coupling unit (6) is installed, and a support frame (13) is fixedly connected to the support base (1). A transmission shaft (14) is rotatably installed on the support frame (13). The transmission shaft (14), the output shaft of the motor under test (3), and the central axis of the coupling unit (6) are collinear. A sensor unit (15) for testing the motor under test (3) and a load unit (16) for providing load are installed on the transmission shaft (14). The lifting mechanism (2) includes a first lead screw (21) and a second lead screw (22). 2) Both are rotatably installed in the mounting slot. The center lines of the first lead screw (21) and the second lead screw (22) are collinear and their threads are opposite. A drive motor (23) is fixedly connected to the support base (1). The output shaft of the drive motor (23) is threadedly connected to the second lead screw (22). A first slider (24) is screwed onto the first lead screw (21), and a second slider (25) is screwed onto the second lead screw (22). The lower support plate (4) includes a first V-shaped plate (41), which is fixedly connected to the first slider (24). An L-shaped rod (42) is fixedly connected to the lower end of the first V-shaped plate (41). The L-shaped rod (42) has a first guide groove (43) below the motor (3) being tested. A T-shaped plate (44) is slidably installed in the first guide groove (43) of the L-shaped rod (42). A first compression spring (45) is provided below the T-shaped plate (44) of the first guide groove (43). A second V-shaped plate (46) is fixedly connected to the second slider (25). The first V-shaped plate (41) and the second V-shaped plate (46) are symmetrically arranged about the central axis of the transmission shaft (14).The support plate (5) includes a plate body (51) and a rotating rod (52). The plate body (51) has multiple stepped holes (54) circumferentially open. The inner wall of the stepped holes (54) has a limiting groove (55). The coupling unit (6) includes a connecting key (61), a rod body (62), and an insertion block (63). The rod body (62) is rotatably installed in the stepped holes (54). The connecting key (61) is fixedly connected to the end of the rod body (62) near the motor (3) being tested. The insertion block (63) is fixedly connected to the rod body (62). 3) A limit block (64) is fixedly connected to one end of the rod (62) near the drive shaft (14). The rod (62) has a limit block (64) fixedly connected in the limit groove (55). A second guide groove (141) is provided at one end of the drive shaft (14) near the support plate (5). A top block (142) is slidably installed in the second guide groove (141). A second compression spring (143) is laterally arranged between the top block (142) and the drive shaft (14) in the second guide groove (141).

2. The test fixture for servo motor aging tests according to claim 1, characterized in that: A sliding groove (17) is provided on the side of the through groove away from the mounting groove. The first V-shaped plate (41) is fixedly connected to the first plate body (411) in the sliding groove (17), and the second V-shaped plate (46) is fixedly connected to the second plate body (461) in the sliding groove (17).

3. The test fixture for servo motor aging tests according to claim 1, characterized in that: The rotating rod (52) is rotatably mounted on the support base (1), and the support base (1) is equipped with an adjusting motor (53). The output shaft of the adjusting motor (53) is connected to the rotating rod (52) in a transmission manner. The disc body (51) is fixedly mounted on the rotating rod (52), and the coupling unit (6) is installed in the stepped hole (54).

4. A test fixture for servo motor aging tests according to claim 1, characterized in that: The clamping mechanism (12) is a cylinder.

5. A test fixture for servo motor aging tests according to claim 1, characterized in that: The load unit (16) employs a hysteresis brake.

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