Deflection testing device for motor shaft

Abstract

The utility model relates to motor performance detection, in particular to a motor shaft deflection testing device. A contact type distance measuring sensor and a non-contact type magnetic sensor are integrated, the position of a key can be automatically identified and accurately avoided in the detection process, the accuracy of a detection result is ensured, damage to the motor shaft key in the detection process is avoided, and the detection efficiency is greatly improved. Comprising a machine; a detection table for fixing a motor to be tested is arranged at the top of the machine table, and a detection mechanism is arranged at the top of the machine table and below the detection table. The detection platform comprises a motor carrying platform, the motor carrying platform is provided with a through hole and a positioning pin, and a motor to be tested is matched and positioned with the positioning pin through a flange mounting hole of the motor to be tested. The detection mechanism comprises a rotary table, a guide rod air cylinder is installed on the rotary table, an L-shaped installation frame is connected to a cylinder rod of the guide rod air cylinder, and a contact type distance measuring sensor is installed on the L-shaped installation frame. A vertical plate is further arranged on the L-shaped installation frame, and a non-contact magnetic sensor is installed on the vertical plate.

Description

Technical Field

[0001] This utility model relates to motor performance testing, and more particularly to a motor shaft runout testing device. Background Technology

[0002] Motor shaft runout refers to the change or deviation of the radial position of the motor shaft relative to the ideal rotation center line during rotation. This runout may be caused by manufacturing errors, improper assembly, or other factors. In the motor manufacturing process, radial runout detection of the motor shaft is an important mechanical performance test indicator. This test can check the shape and positional errors of the motor shaft, thereby determining whether motor shaft runout exists.

[0003] Currently, the main method for detecting radial runout of motor shafts is contact ranging. The typical procedure for contact ranging when measuring complex geometries and dimensions is as follows: first, the motor shaft to be tested is fixed to a fixture; then, a dial indicator is mounted on top of the fixture; subsequently, the motor shaft is rotated so that the dial indicator's bottom probe contacts the shaft. One rotation of the dial indicator measures the diameter of a specific part of the motor shaft, thus completing the detection. However, this contact ranging method has significant drawbacks: not only is the detection efficiency low, but manual reading is prone to errors, and the measurement data cannot be automatically recorded and transmitted. Therefore, developing a reliable and efficient motor shaft runout detection device has become an urgent problem for engineers in this field. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a motor shaft runout testing device. It offers high testing efficiency and accurate results.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a motor shaft runout testing device, comprising a machine base; a testing platform for fixing the motor to be tested is provided on the top of the machine base, and a testing mechanism is provided on the top of the machine base and below the testing platform. The testing platform includes a motor carrier, which has a through hole and a positioning pin. The motor to be tested is positioned by engaging the positioning pin through its flange mounting hole. The motor shaft of the motor to be tested passes through the through hole and extends above the testing mechanism. The testing mechanism includes a rotary table, on which a guide rod cylinder is mounted. An L-shaped mounting bracket is connected to the cylinder rod of the guide rod cylinder. A contact-type distance sensor for detecting the radial runout of the motor shaft is mounted on the L-shaped mounting bracket. A vertical plate is also provided on the L-shaped mounting bracket, on which a non-contact magnetic sensor for detecting the key position on the motor shaft is mounted.

[0006] Furthermore, a tabletop mounting plate is installed on the top of the machine. The motor carrier of the testing table is fixed to the tabletop mounting plate by four columns below it. Each column is fixed to the tabletop mounting plate by its own connector.

[0007] Furthermore, the top of the motor platform of the testing station is provided with a square groove, the inner contour of which is adapted to the outer contour of the bottom flange of the motor to be tested; a through hole is provided in the center of the square groove for the motor shaft to pass through.

[0008] Furthermore, there are four locating pins, which are evenly distributed in the square groove, and the four locating pins are arranged symmetrically with the through hole as the center.

[0009] Furthermore, the rotary table is connected to the servo motor via a harmonic reducer. The servo motor's base is fixedly mounted on the table mounting plate with bolts. The input shaft of the harmonic reducer is directly connected to the output shaft of the servo motor via a coupling. The output shaft of the harmonic reducer is coaxially connected to the central shaft of the rotary table, which is used to drive the rotary table to rotate 360°.

[0010] Furthermore, at least two T-slots are arranged on the working surface of the rotary table, and a T-bolt mounting part is provided on each of the left and right sides of the fan-shaped mounting plate; each T-bolt mounting part is equipped with a T-bolt, and the fan-shaped mounting plate is fixedly connected to the T-slots of the rotary table through the T-bolts on both sides.

[0011] Furthermore, the rotary table has a disc-shaped structure with a shaft hole in the center to avoid the motor shaft.

[0012] Furthermore, T-slots are provided in the radial direction of the rotary table, and each T-slot extends from the edge of the rotary table toward the central shaft hole.

[0013] Compared with the prior art, this utility model has the following advantages.

[0014] This invention integrates a contact ranging sensor and a non-contact magnetic sensor, which can automatically identify and accurately avoid key positions during the detection process, ensuring the accuracy of the detection results and avoiding damage to the motor shaft key during the detection process, thus greatly improving the detection efficiency. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0016] Figure 1 This is a three-dimensional view of the motor shaft runout testing device in the embodiment.

[0017] Figure 2 This is the overall front view of the motor shaft runout testing device in the embodiment.

[0018] Figure 3 This is a three-dimensional view of the testing mechanism of the motor shaft runout testing device in the embodiment.

[0019] Figure 4This is the front view of the testing mechanism of the motor shaft runout testing device in the embodiment.

[0020] Figure 5 This is a three-dimensional view of the test platform of the motor shaft runout testing device in the embodiment.

[0021] In the diagram: 1. Machine base; 2. Testing table; 3. Testing mechanism; 4. Motor to be tested; 101. Table mounting plate; 102. Electrical control box; 201. Motor carrier; 202. Positioning pin; 203. Square groove; 204. Through hole; 205. Column; 301. Servo motor; 302. Harmonic reducer; 303. Rotary table; 304. T-slot; 305. Fan-shaped mounting plate; 306. Guide rod cylinder; 307. L-shaped mounting bracket; 308. Contact distance sensor; 309. Vertical plate; 310. Non-contact magnetic sensor; 311. T-bolt; 312. Shaft hole; 401. Motor shaft; 402. Key. Detailed Implementation

[0022] To make the objectives, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0023] like Figure 1-5 As shown, the motor shaft runout testing device includes a machine base 1; a testing platform 2 for fixing the motor 4 to be tested is provided on the top of the machine base 1, and a testing mechanism 3 is provided on the top of the machine base 1 and below the testing platform 2. The testing platform 2 includes a motor carrier 201, which is provided with a through hole 204 and a positioning pin 202. The motor 4 to be tested is positioned by engaging with the positioning pin 202 through its flange mounting hole. The motor shaft 401 of the motor 4 to be tested passes through the through hole 204 and extends above the testing mechanism 3. The detection mechanism 3 includes a rotary table 303, on which a guide rod cylinder 306 is mounted. An L-shaped mounting bracket 307 is connected to the cylinder rod of the guide rod cylinder 306 for driving the L-shaped mounting bracket 307 to move back and forth. A contact-type distance sensor 308 for detecting the radial runout of the motor shaft 401 is mounted on the L-shaped mounting bracket 307. A vertical plate 309 is also provided on the L-shaped mounting bracket 307, on which a non-contact magnetic sensor 310 for detecting the position of the key 402 of the motor shaft 401 is mounted.

[0024] The detection principle of the motor shaft runout testing device is as follows: the process of testing the runout of the motor shaft 401 relies on the working cooperation of the contact distance sensor 308 and the non-contact magnetic sensor 310. The non-contact magnetic sensor 310 is used to determine the position of the key 402 on the motor shaft 401 and mark the start and end angles of the key 402. The contact distance sensor 308 rotates 360° along the motor shaft 401 under the drive of the rotary table 303, measuring the radial distance on the shaft surface in real time. When approaching the key 402, the guide rod cylinder 306 quickly retracts the contact distance sensor 308 to avoid collision; after passing the key 402, the guide rod cylinder 306 extends the contact distance sensor 308 again to continue the measurement.

[0025] The specific process is as follows: The rotary table 303, carrying the contact distance sensor 308, rotates one full circle (360 degrees) around the motor shaft 401. During this process, the contact distance sensor 308 contacts the surface of the motor shaft 401 to measure the radial distance at different positions on the motor shaft 401. When encountering the key 402, because the key 402 is higher than the rest of the surface of the motor shaft 401, the guide rod cylinder 306 retracts the contact distance sensor 308 to avoid collision, and then extends it again to continue measurement. The purpose is to accurately measure the runout along the entire circumference without interference from the key 402. By continuously recording the radial dimension change of the motor shaft 401 in the circumferential direction, if the measurement data fluctuation is within the allowable range, it is determined that the motor shaft 401 has no runout, that is, the motor shaft 401 is straight and aligned; if periodic or large deviations occur, it is determined that runout exists.

[0026] Preferably, a tabletop mounting plate 101 is installed on the top of the machine base 1. The motor carrier 201 of the testing table 2 is fixed to the tabletop mounting plate 101 by four columns 205 below it, wherein each column 205 is fixed to the tabletop mounting plate 101 by its own connector. The top of the motor carrier 201 of the testing table 2 is provided with a square groove 203, the inner contour of which is adapted to the outer contour of the bottom flange of the motor 4 to be tested; a through hole 204 is opened in the center of the square groove 203 for the motor shaft 401 to pass through. There are four positioning pins 202, which are evenly distributed in the square groove 203, and the four positioning pins 202 are symmetrically arranged with the through hole 204 as the center. It uses a motor platform 201 supported by four columns 205, a square groove 203 and four symmetrically distributed positioning pins 202 to ensure the precise fit between the flange mounting hole of the motor 4 under test and the positioning pins 202, effectively eliminating installation deviations and improving the coaxiality of the initial positioning of the motor shaft 401.

[0027] Example 1: The bottom surface of the square groove 203 forms a surface contact positioning with the lower end face of the bottom flange of the motor 4 to be tested; the four inner sidewalls of the square groove 203 form a clearance fit with the outer side of the bottom flange of the motor 4 to be tested, and the fit clearance is 0.1-0.5mm.

[0028] Example 2: The electrical control box 102 is installed below the table mounting plate 101 of the machine tool 1. It is used to control the start, stop, speed and rotation direction of the servo motor 301; at the same time, it processes the position signal from the key 402 of the non-contact magnetic sensor 310 to trigger the guide rod cylinder 306 to act; and stores and analyzes the measurement data of the contact distance sensor 308.

[0029] Preferably, the rotary table 303 is connected to the servo motor 301 via a harmonic reducer 302. The base of the servo motor 301 is fixedly mounted on the table mounting plate 101 by bolts. The input shaft of the harmonic reducer 302 is directly connected to the output shaft of the servo motor 301 via a coupling. The output shaft of the harmonic reducer 302 is coaxially connected to the central shaft of the rotary table 303 to drive the rotary table 303 to rotate 360°.

[0030] Preferably, the rotary table 303 has a disc-shaped structure with a central shaft hole 312 to avoid interference from the motor shaft 401. At least two T-slots 304 are arranged on the working surface of the rotary table 303. The T-slots 304 are located radially on the rotary table 303, i.e., radially on the disc-shaped structure, and each T-slot 304 extends from the edge of the rotary table 303 towards the central shaft hole 312, meaning the extension direction of the T-slots 304 is consistent with the radial direction of the rotary table 303. A T-bolt 311 mounting portion is provided on each of the left and right sides of the sector-shaped mounting plate 305; each T-bolt 311 mounting portion is equipped with one T-bolt 311. The sector-shaped mounting plate 305 is fixedly connected to the T-slots 304 of the rotary table 303 via the T-bolts 311 on both sides. In other words, the sector-shaped mounting plate 305 is connected to the radially arranged T-slots 304 via the T-bolts 311, allowing the mounting position to be adjusted radially.

[0031] The usage process of this utility model is described in conjunction with the accompanying drawings and technical solutions:

[0032] 1. The motor shaft 401 runout testing device can be used as a runout testing platform for the motor shaft 401, or it can be used with a robot arm to perform shaft runout testing on motors produced on the assembly line. Only the robot arm needs to complete the motor handling.

[0033] 2. When used as a runout testing platform, first place the motor 4 to be tested on the testing table 2, and position it by engaging the flange mounting hole of the motor 4 with the positioning pin 202. Then start the testing mechanism 3. First, the guide rod cylinder 306 actuates, the contact distance sensor 308 moves away from the motor shaft 401, and the rotary table 303 rotates 360 degrees. After the non-contact magnetic sensor 310 detects and confirms the position of the key 402 of the motor 4 to be tested, the rotary table 303 rotates 360 degrees in the opposite direction. During this rotation, the guide rod cylinder 306 makes the contact distance sensor 308 contact the motor shaft 401. When it encounters the key 402, the guide rod cylinder 306 retracts, so that the contact distance sensor 308 crosses the position of the key 402, that is, the distance sensor retracts and avoids the position above the key 402. Then the guide rod cylinder 306 extends again to make the contact distance sensor 308 contact the motor shaft 401, realizing the runout detection of the motor shaft 401.

[0034] 3. After the testing is completed, the tested motor 4 will be removed manually.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "preferred embodiment," "detailed description," or "preferred embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Therefore, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of this utility model.

Claims

1. A motor shaft runout testing device, comprising a machine base (1); characterized in that: The top of the machine (1) is provided with a test platform (2) for fixing the motor (4) to be tested, and a test mechanism (3) is provided on the top of the machine (1) and below the test platform (2). The testing station (2) includes a motor platform (201), which has a through hole (204) and a positioning pin (202). The motor (4) to be tested is positioned by its flange mounting hole and the positioning pin (202). The motor shaft (401) of the motor (4) to be tested passes through the through hole (204) and extends to the top of the testing mechanism (3). The detection mechanism (3) includes a rotary table (303), on which a guide rod cylinder (306) is installed. An L-shaped mounting bracket (307) is connected to the cylinder rod of the guide rod cylinder (306). A contact-type distance sensor (308) for detecting the radial runout of the motor shaft (401) is installed on the L-shaped mounting bracket (307). A vertical plate (309) is also provided on the L-shaped mounting bracket (307). A non-contact magnetic sensor (310) for detecting the position of the key (402) on the motor shaft (401) is installed on the vertical plate (309).

2. The motor shaft runout testing device according to claim 1, characterized in that: The machine (1) is equipped with a table mounting plate (101) on top. The motor carrier (201) of the testing table (2) is fixed to the table mounting plate (101) by four columns (205) below it. Each column (205) is fixed to the table mounting plate (101) by its own connector.

3. The motor shaft runout testing device according to claim 2, characterized in that: The top of the motor platform (201) of the test bench (2) is provided with a square groove (203), the inner contour of which is adapted to the outer contour of the bottom flange of the motor (4) to be tested; a through hole (204) is provided in the center of the square groove (203) for the motor shaft (401) to pass through.

4. The motor shaft runout testing device according to claim 3, characterized in that: There are four positioning pins (202), which are evenly distributed in the square groove (203). The four positioning pins (202) are arranged symmetrically with the through hole (204) as the center.

5. The motor shaft runout testing device according to claim 2, characterized in that: The rotary table (303) is connected to the servo motor (301) via a harmonic reducer (302). The base of the servo motor (301) is fixedly mounted on the table mounting plate (101) with bolts. The input shaft of the harmonic reducer (302) is directly connected to the output shaft of the servo motor (301) via a coupling. The output shaft of the harmonic reducer (302) is coaxially connected to the central shaft of the rotary table (303) to drive the rotary table (303) to rotate 360°.

6. The motor shaft runout testing device according to claim 5, characterized in that: At least two T-slots (304) are arranged on the working surface of the rotary table (303), and a T-bolt mounting part is provided on each of the left and right sides of the fan-shaped mounting plate (305); each T-bolt mounting part is equipped with a T-bolt (311), and the fan-shaped mounting plate (305) is fixedly connected to the T-slots (304) of the rotary table (303) through the T-bolts (311) on both sides.

7. The motor shaft runout testing device according to claim 6, characterized in that: The rotary table (303) has a disc-shaped structure with a shaft hole (312) in the center to avoid the motor shaft (401).

8. The motor shaft runout testing device according to claim 7, characterized in that: T-slots (304) are provided in the radial direction of the rotary table (303), and each T-slot (304) extends from the edge of the rotary table (303) toward the central shaft hole (312).

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