A servo motor rotation accuracy testing device

Abstract

This invention discloses a servo motor rotation accuracy testing device, including a test platform with a through hole. An angle encoder is mounted on the bottom of the test platform, and a connecting seat is installed in the middle of the angle encoder. An expansion sleeve is mounted on the connecting seat. An annular guide rail is fixedly connected to the upper side of the test platform. The annular guide rail is coaxial with the through hole, and a side-pushing device is provided on the annular guide rail. This invention increases the external force that causes the test motor and the angle encoder to deviate from their axes, and performs multiple tests at different positions to cause the test motor to deviate from its axis. Multiple sets of error test curves are compared with normal curves without the external force. The device verifies whether the error test curves and normal curves have the same magnitude of error value, thereby enabling reverse verification of the coaxiality of the test motor and the angle encoder during normal curve testing. Thus, in high-precision testing, the test data more closely matches the theoretical values.

Description

Technical Field

[0001] This invention relates to the field of motor testing equipment technology, and in particular to a servo motor rotation accuracy testing device. Background Technology

[0002] Servo motors are controlled by input signals and can respond quickly. In control systems, they are used as actuators to convert received electrical signals into angular displacement or angular velocity outputs on the motor shaft. They are widely used in precision machine tools, industrial robots, and other equipment with relatively high requirements for precision and reliability. The quality and precision of the servo motor itself are the foundation for ensuring the precision of the aforementioned equipment.

[0003] In the prior art, such as the servo motor rotation accuracy testing device with patent application number CN202122486008.1, there are a support, a connector, an angle encoder, a data acquisition and analysis unit, and a servo unit for controlling the rotation of the servo motor; the encoder is electrically connected to the data acquisition and analysis unit, the support includes a mounting plate, a vertical base and a horizontal base, the mounting plate has a through hole for mounting the angle encoder and the servo motor, the through hole extends from one end of the mounting plate to the other end of the mounting plate, the angle encoder is fixed to one end of the mounting plate, and the angle encoder is connected to the servo motor through a connector and an expansion sleeve.

[0004] The aforementioned testing device is connected via an expansion sleeve, and the installation positions of the angle encoder and servo motor are prone to deviation, causing the spindle of the servo motor and the angle encoder to be unable to achieve theoretically perfect coaxiality. During high-precision testing, the accumulation of coaxiality error affects the final test results. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a servo motor rotation accuracy testing device, thereby solving the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A servo motor rotation accuracy testing device includes a test platform with a through hole. An angle encoder is installed at the bottom of the test platform, a connecting seat is installed in the middle of the angle encoder, and an expansion sleeve is installed on the connecting seat. An annular guide rail is fixedly connected to the upper side of the test platform. The annular guide rail is coaxial with the through hole, and a side pushing device is provided on the annular guide rail.

[0008] The side-pushing device includes a movable base, which is slidably connected to an annular guide rail. A vertical plate is fixedly connected to the upper side of the movable base, and a telescopic rod is fixedly connected to the vertical plate. A side plate is fixedly connected to the end of the telescopic rod. An annular groove is provided on the inner wall of the through hole. A rubber ring is fixedly connected to the inner wall of the annular groove. A support ring is fixedly connected to the inner ring of the rubber ring. The support ring is slidably connected to the annular groove. The support ring is used to install a test motor.

[0009] Preferably, the side plate has an arc-shaped structure or a flat plate structure.

[0010] Preferably, a slot is provided on one side of the side plate, the lower end of the slot is a closed structure, a plug plate is inserted into the slot, and a rubber pad is fixedly connected to one side of the plug plate.

[0011] Preferably, the rubber pad has a sloping structure that is narrow at the top and narrow at the bottom.

[0012] Preferably, the cross-section of the annular guide rail is T-shaped or dovetail-shaped.

[0013] Preferably, the outer arc surface of the annular guide rail is provided with three insertion holes, and the outer side of the movable seat is provided with a sliding hole, in which a plug rod is slidably connected, and the plug rod is adapted to the insertion hole.

[0014] Preferably, the end of the insertion rod is rotatably connected to a ball bearing.

[0015] Preferably, the outer end of the insertion rod is provided with a boss, and a support spring is fixedly connected between the boss and the movable seat.

[0016] Preferably, the boss is fixedly connected to the pull ring.

[0017] Preferably, the telescopic rod is hydraulic, pneumatic, or electric.

[0018] The advantages of this invention are as follows: The servo motor rotation accuracy testing device provided by this invention increases the external force that causes the test motor and the angle encoder to deviate from their axes, and performs multiple tests. By causing the test motor to deviate from its axis at different positions, multiple sets of error test curves are compared with the normal curve without the external force. This allows for the verification of whether the error test curve and the normal curve have the same error value. In this way, the coaxiality of the test motor and the angle encoder during the normal curve test can be verified in reverse. Thus, in the high-precision testing process, the test data is closer to the theoretical value.

[0019] This invention increases the thickness of the rubber pad by adding a narrower upper and lower end, so that the test motor is closer to the angle encoder. This results in a greater lateral thrust of the test motor as it gets closer to the angle encoder, thereby reducing the risk of the test motor's main shaft bending and avoiding adverse effects on the test motor.

[0020] This invention allows the movable seat to slide freely on the annular guide rail after the plug rod is pulled out. When the plug rod is coaxial with the adjacent plug hole, it is inserted into the plug hole under the elastic reset action of the support spring to form a limit. Subsequently, a lateral thrust can be applied to the test motor at this position. The three plug holes are evenly distributed, and the fan-shaped angle between two adjacent plug holes with the test motor axis as the reference is °. By performing lateral thrust at these three positions, the test data is more representative. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the basic structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 yes Figure 2 Enlarged view of section E in the image;

[0024] Figure 4 This is a schematic diagram of the side plate of the present invention;

[0025] Figure 5 yes Figure 4 Enlarged view of section F in the image;

[0026] Figure 6 This is a schematic diagram of the connection structure between the insertion rod and the movable base of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] like Figure 1-6 As shown, the present invention provides a test device for testing the rotational accuracy of a test motor 10, including a test platform 1, a through hole 11, an angle encoder 2 mounted on the bottom of the test platform 1, a connecting seat 3 mounted in the middle of the angle encoder 2, the angle encoder including a hollow shaft, the connecting seat being connected to the hollow shaft of the angle encoder by screws, an expansion sleeve mounted on the connecting seat 3, the main shaft of the test motor 10 being embedded in the expansion sleeve and locked by the expansion sleeve, the resolution of the angle encoder 2 being more than 8 times that of the built-in encoder of the test motor 10, and also including a data acquisition and analysis unit and a servo unit for controlling the rotation of the test motor 10, the servo unit including a numerical control system and a servo driver, the angle encoder 2 being electrically connected to the data acquisition and analysis unit, an annular guide rail 5 being fixedly connected to the upper side of the test platform 1, the annular guide rail 5 being coaxial with the through hole 11, the cross section of the annular guide rail 5 being "T" shaped or dovetail shaped, and a side pushing device 6 being provided on the annular guide rail 5;

[0029] The specific testing process is as follows:

[0030] Step 1: Install the test motor 10 on the test bench 1 and lock it in place;

[0031] Step 2: Connect the power supply and signal cable, and start the measurement;

[0032] Third step: The servo unit sends a motion signal command to the test motor 10, and the test motor 10 rotates accordingly. The data acquisition and analysis unit simultaneously acquires the position signal of the angle encoder 2.

[0033] Fourth step: Under the same clock, the data acquisition and analysis unit analyzes and compares the acquired position signal with the target position of the rotational motion command, and finally outputs the rotational accuracy error curve of the test motor 10.

[0034] In one embodiment of the present invention, the side-pushing device 6 includes a movable seat 61, which is slidably connected to the annular guide rail 5. A vertical plate 62 is fixedly connected to the upper side of the movable seat 61, and a telescopic rod 63 is fixedly connected to the vertical plate 62. The telescopic rod 63 is hydraulic, pneumatic, or electric. A side plate 64 is fixedly connected to the end of the telescopic rod 63. An annular groove 65 is provided on the inner wall of the through hole 11. A rubber ring 66 is fixedly connected to the inner wall of the annular groove 65. A support ring 67 is fixedly connected to the inner ring of the rubber ring 66. The support ring 67 is slidably connected to the annular groove 65. The support ring 67 is used to install the test motor 10.

[0035] In this embodiment, by adding an external force to cause the test motor 10 and the angle encoder to deviate from each other, and testing multiple times, the test motor 10 is deviated from each other at different positions. Multiple sets of error test curves are compared with the normal curve without adding external force. It is possible to verify whether the error test curve and the normal curve have the same error value. This allows for reverse verification of the coaxiality between the test motor 10 and the angle encoder during the normal curve test. As a result, the test data is closer to the theoretical value during the high-precision test.

[0036] When a lateral thrust needs to be applied at a certain position, the telescopic rod 63 extends, and the side plate 64 applies the thrust from the side of the test motor 10, causing the test motor 10 to deviate from the angle encoder. After the thrust is removed, the rubber ring 66 causes the support ring 67, which can slide in the annular groove 65, to return to its initial state. By applying the lateral thrust multiple times at different positions, an error test curve is formed. Whether the error test curve and the normal curve have the same error value can be verified in reverse to verify the coaxiality of the test motor 10 and the angle encoder during the normal curve test, thereby improving the test quality.

[0037] In one embodiment of the present invention, the side plate 64 has an arc-shaped structure or a flat plate structure. A slot 641 is provided on one side of the side plate 64. The lower end of the slot 641 has a closed structure. An insert plate 642 is inserted into the slot 641. A rubber pad 643 is fixedly connected to one side of the insert plate 642. The rubber pad 643 has a sloping structure that is narrow at the top and narrow at the bottom.

[0038] Since the main shaft of the test motor 10 is connected to the angle encoder 2 via the expansion sleeve, connecting seat 3, and the expansion joint 3, when the test motor 10 applies a lateral thrust, due to the torque, if the applied lateral thrust is consistent from top to bottom, it is easy to cause the displacement of the main shaft connection position of the test motor 10 to be less than the uppermost end of the test motor 10, which may cause the main shaft to tilt. By adding a rubber pad 643 with a narrower upper end and a thicker lower end, the thickness of the rubber pad 643 is increased as the test motor 10 gets closer to the angle encoder 2, thereby increasing the lateral thrust of the test motor 10 as it gets closer to the angle encoder 2, thus reducing the risk of the main shaft of the test motor 10 bending and avoiding adverse effects on the test motor 10.

[0039] In one embodiment of the present invention, the outer arc surface of the annular guide rail 5 is provided with three insertion holes 51, the outer side of the movable seat 61 is provided with a sliding hole, and the insertion rod 52 is slidably connected in the sliding hole. The insertion rod 52 is adapted to the insertion hole 51. The end of the insertion rod 52 is rotatably connected to a ball bearing 53. The outer end of the insertion rod 52 is provided with a boss 54. The boss 54 and the movable seat 61 are fixedly connected with a support spring 55. The boss 54 is fixedly connected with a pull ring 56.

[0040] When the position of the movable seat 61 needs to be adjusted, the insert rod 52 is pulled out, and the movable seat 61 can slide freely on the annular guide rail 5. When the insert rod 52 is coaxial with the adjacent insertion hole 51, under the elastic reset action of the support spring 55, the insert rod 52 is inserted into the insertion hole 51 to form a limit. Then, a lateral thrust can be applied to the test motor 10 at this position. The three insertion holes 51 are evenly distributed, and the fan-shaped angle between two adjacent insertion holes 51 with the axis of the test motor 10 as the reference is 120°. By performing lateral thrust at these three positions, the test data is more representative.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A kind of servo motor rotation precision testing device, including test table (1), test table (1) is equipped with through hole (11), the bottom of test table (1) is equipped with angle encoder (2), the middle part of angle encoder (2) is equipped with connecting seat (3), connecting seat (3) is equipped with expansion sleeve, it is characterized by: The test bench (1) is fixedly connected to an annular guide rail (5), which is coaxial with the through hole (11). A side push device (6) is provided on the annular guide rail (5). The side-pushing device (6) includes a movable seat (61), which is slidably connected to the annular guide rail (5). A vertical plate (62) is fixedly connected to the upper side of the movable seat (61). A telescopic rod (63) is fixedly connected to the vertical plate (62). A side plate (64) is fixedly connected to the end of the telescopic rod (63). An annular groove (65) is provided on the inner wall of the through hole (11). A rubber ring (66) is fixedly connected to the inner wall of the annular groove (65). A support ring (67) is fixedly connected to the inner ring of the rubber ring (66). The support ring (67) is slidably connected to the annular groove (65). The support ring (67) is used to install the test motor (10). The main shaft of the test motor (10) is connected through an expansion sleeve, a connecting seat (3), and an angle encoder (2). The side plate (64) has a slot (641) on one side. The lower end of the slot (641) is closed. A plug plate (642) is inserted into the slot (641). A rubber pad (643) is fixedly connected to one side of the plug plate (642). The rubber pad (643) has a sloping structure that is narrow at the top and wide at the bottom.

2. The servo motor rotation accuracy testing device according to claim 1, characterized in that: The side plate (64) has an arc-shaped structure or a flat plate structure.

3. The servo motor rotation accuracy testing device according to claim 1, characterized in that: The cross-section of the annular guide rail (5) is "T" shaped or dovetail shaped.

4. The servo motor rotation accuracy testing device according to claim 3, characterized in that: The outer arc surface of the annular guide rail (5) is provided with three insertion holes (51). The outer side of the movable seat (61) is provided with a sliding hole, and the insertion rod (52) is slidably connected in the sliding hole. The insertion rod (52) is adapted to the insertion hole (51).

5. The servo motor rotation accuracy testing device according to claim 4, characterized in that: The end of the insert (52) is rotatably connected to a ball bearing (53).

6. The servo motor rotation accuracy testing device according to claim 5, characterized in that: The outer end of the insertion rod (52) is provided with a boss (54), and a support spring (55) is fixedly connected between the boss (54) and the movable seat (61).

7. The servo motor rotation accuracy testing device according to claim 6, characterized in that: The boss (54) is fixedly connected to the pull ring (56).

8. A servo motor rotation accuracy testing device according to any one of claims 1 to 7, characterized in that: The telescopic rod (63) can be hydraulic, pneumatic or electric.

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