Radial run-out detection device for motor rotating shaft

Abstract

The utility model discloses a motor rotating shaft radial run-out detection device, which comprises a driving motor, a flexible transmission head, a detection meter and a positioning gantry, the flexible transmission head is arranged at the driving tail end of the driving motor, the outer end face of the flexible transmission head is provided with a friction transmission taper hole, and the central axis of the friction transmission taper hole is coaxial with the rotation central line of the driving motor. A to-be-tested motor is located on the positioning portal and is opposite to the driving motor, the taper angle of the friction transmission taper hole is consistent with the chamfer of the tail end of the rotating shaft, the tail end of the rotating shaft is inserted into the friction transmission taper hole and abuts against the conical surface of the friction transmission taper hole, and the driving motor drives the rotating shaft through the flexible transmission head. The detection device adopts a driving motor reverse dragging driving mode to provide detection rotation motion, so that the detection efficiency of the to-be-detected motor can be remarkably improved; the flexible transmission head is connected with the rotating shaft for driving power input, detection of to-be-detected motors of various models can be realized, effective transmission of friction driving force is facilitated, micro-deformation self-adaption to the center of the rotating shaft can be realized, and the detection precision of radial run-out of the motor rotating shaft is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor testing technology, specifically to a device for detecting radial runout of a motor shaft. Background Technology

[0002] After servo motor assembly, the radial runout of the shaft needs to be tested. The radial runout of the pitch circle is used to judge the overall quality of the motor assembly. Existing testing devices have a relatively simple structure, usually using the motor under test to actively rotate or manually rotate the motor shaft to perform radial runout testing. This testing method has low efficiency. First, it requires a dedicated power supply for the motor under test, and plugging and unplugging is required when changing the motor under test, along with winding and storing the motor wires. Second, since the testing speed of the motor under test is relatively low, if the motor under test is actively rotated, a controller needs to be configured and parameters adjusted. Third, manual rotation is difficult to control at a uniform speed and is prone to collisions, resulting in low testing accuracy. Therefore, a testing drive method and testing device that can improve testing efficiency and be adapted to the testing of servo motors of various specifications are needed. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a motor shaft radial runout detection device to solve one or more problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A device for detecting radial runout of a motor shaft includes a drive motor, a flexible transmission head, a measuring instrument, and a positioning gantry. The flexible transmission head is located at the drive end of the drive motor and is used for flexible friction drive and automatic center adaptation. A friction transmission conical hole is provided on the outer end face of the flexible transmission head. The central axis of the friction transmission conical hole is coaxial with the rotation center line of the drive motor. The motor under test is positioned on the positioning gantry and is positioned opposite to the drive motor. The cone angle of the friction transmission conical hole is consistent with the chamfer of the end of the motor shaft under test. Under the action of relative thrust, the end of the shaft is inserted into the friction transmission conical hole, and the end chamfer abuts against the conical surface of the friction transmission conical hole. The drive motor drives the shaft to rotate through the flexible transmission head. The measuring instrument is located directly above the shaft and is used to measure the radial runout of the shaft.

[0006] Furthermore, it also includes a base plate and a sliding rail. The base plate is provided with a sliding rail along the longitudinal direction. The drive motor is slidably mounted on the sliding rail via a drive slide block. The positioning gantry is also mounted on the sliding rail.

[0007] Furthermore, a clamping mechanism is provided on the positioning gantry. The center of the positioning gantry is a rectangular positioning area. The flange seat of the motor under test is inserted into the positioning area. The clamping mechanism includes clamping bolts and pressure plates. The clamping bolts are threadedly connected to the crossbeam on the positioning gantry. Adjustment grooves are provided on the two side columns of the positioning gantry. The two ends of the pressure plate can slide relative to each other in the adjustment grooves and are horizontal. The clamping bolts drive the pressure plates to rise and fall, which is used to clamp the top surface of the flange seat.

[0008] Furthermore, it also includes adjusting pads, which are set on both sides and bottom of the positioning area. The adjusting pads on both sides are used in pairs to adjust the gap between the positioning gantry and the flange seat on both sides.

[0009] Preferably, the flexible transmission head is made of polyurethane.

[0010] Furthermore, a limit block is provided at the end of the sliding track to limit the drive slide block to the sliding track, and a flexible anti-collision block is provided on the inner side of the limit block.

[0011] Compared with existing technologies, the radial runout detection device for motor shafts of this utility model uses a reverse-drive method to provide detection rotational motion. The drive motor has preset detection parameters and is kept energized. Therefore, for servo motors without brakes, radial runout detection can be achieved simply by fixing the motor under test. The motor under test does not need to be energized, configured with a controller, or have parameters set, which can significantly improve the detection efficiency of the motor under test. The flexible transmission head connects to the shaft for driving power input, which can be applied to motor shafts with different shaft diameters to realize the detection of various models of motors under test. The high friction coefficient between the flexible transmission head and the shaft is conducive to effectively transmitting friction driving force, and the flexible transmission head can slightly deform to adapt to the shaft center, improving the detection accuracy of radial runout of the shaft. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the detection device exemplified by this utility model;

[0013] Figure 2 This is another three-dimensional structural diagram of the detection device exemplified by this utility model.

[0014] In the diagram: 1. Base plate; 11. Sliding track; 12. Limiting block; 2. Drive slide; 21. Sliding block; 3. Drive motor; 4. Table frame; 5. Positioning gantry; 6. Pressing mechanism; 61. Pressure plate; 7. Motor to be tested; 8. Detection seat; 9. Flexible transmission head; 91. Friction transmission cone hole; 10. Detection table. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only the preferred embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0016] like Figures 1-2 As shown, this embodiment provides a motor shaft radial runout detection device, which includes a drive motor 3, a flexible transmission head 9, a detection gauge 10, and a positioning gantry 5. The motor under test 7 is positioned and fixed by the positioning gantry 5 to prevent it from moving during the detection process. The drive motor 3 pre-adjusts the detection drive parameters and drives the shaft of the motor under test 7 to rotate by reverse dragging. Of course, the motor under test 7 should be in a state where reverse dragging is allowed. Therefore, for servo motors with brakes, the brake must be released after connecting to the power supply before the detection operation can be performed.

[0017] During testing, the shaft needs to rotate at a low, uniform speed. To ensure testing accuracy, the external driving force should be input around the shaft's rotation center. A flexible transmission head 9 is installed at the drive end of the drive motor 3. A friction transmission cone hole 91 is provided on the outer end face of the flexible transmission head 9. The central axis of the friction transmission cone hole 91 is coaxial with the rotation center line of the drive motor 3, and the cone angle of the friction transmission cone hole 91 is consistent with the chamfer at the end of the shaft of the motor under test 7. The motor under test 7 and the drive motor 3 are positioned opposite each other on the sliding rail 11. The sliding rail 11 is a double-rail system, and its symmetrical center line is located on the same vertical plane as the rotation center of the motor under test 7 and the drive motor 3, respectively. In the horizontal direction, it is ensured that the external driving center should be aligned with the rotation center of the shaft. To ensure the alignment accuracy of the shaft rotation center, in the vertical direction, an adjusting pad is set at the bottom of the positioning gantry 5 to adjust the vertical position of the motor 7 under test. As a result, the end of the shaft can be accurately inserted into the friction transmission cone hole 91 and has a certain coaxial accuracy. In addition, since the flexible transmission head 9 has a micro-deformation capability, a relative longitudinal thrust is applied to the drive motor 3, and the chamfer of the end of the shaft contacts the cone surface of the friction transmission cone hole 91, causing it to undergo micro-deformation and automatically adapting to adjust the center of the friction transmission cone hole 91 and the rotation center of the shaft. In this way, the reverse driving force drives the shaft to rotate through the chamfer of the end of the shaft to ensure the detection accuracy. The flexible transmission head 9 is preferably made of polyurethane, which is beneficial for friction transmission with the cone surface of the friction transmission cone hole 91.

[0018] A double-track sliding rail 11 is longitudinally mounted on the base plate 1. The drive motor 3 is mounted on an L-shaped drive slide 2. A sliding block 21 is located at the bottom of the drive slide 2. The motor to be tested 7 is positioned on a positioning gantry 5, which is located on a testing seat 8. The testing gauge 10 is positioned via a gauge frame 4 and can be adjusted in multiple dimensions. The gauge frame 4 can be fixed to the positioning gantry 5 or supported on the base plate 1. Figures 1-2 As shown, in this embodiment, it is preferably set on the base plate 1, and the meter frame 4 has lifting and rotation adjustment functions. The detection seat 8 can be fixed on the base plate 1, or it can be slidably set on the sliding rail 11 by setting the sliding block 21. Before detection, the sliding block 21 under the positioning gantry 5 needs to be locked to stabilize the position of the motor 7 to be tested. During detection, after completing the drive power connection and starting the drive, the position of the detection meter 10 is adjusted so that it contacts the circumferential surface of the top of the rotating shaft for detection.

[0019] Refer again Figures 1-2 To ensure testing accuracy, the motor under test (7) needs to be accurately positioned and reliably fixed. The positioning gantry 5 has a rectangular positioning area in the middle, which includes an upper crossbeam, a bottom beam, and two side columns. The flange seat of the motor under test (7) is inserted into the positioning area. The positioning gantry 5 is equipped with a clamping mechanism 6 to quickly position and reliably fix the motor under test (7), improving installation efficiency. The clamping mechanism 6 includes clamping bolts and a pressure plate 61. The clamping bolts are threaded to the upper crossbeam. The inner sides of the two side columns are recessed with adjustment grooves. The tenons at both ends of the pressure plate 61 are inserted into the adjustment grooves and can slide up and down relative to each other. The pressure plate 61 is horizontal, and its lifting adjustment clamps the top surface of the flange seat. In addition, in order to adapt to different flange seat sizes of different models of motor under test (7), its vertical dimension is adjusted by setting an adjustment pad at the bottom. The width dimensions on both sides are adjusted by multiple pairs of adjustment pads to ensure the concentricity of the rotating shaft in the lateral direction. A pair of adjustment pads of the same thickness are respectively set between the side columns and the two sides of the flange seat to prevent the motor under test (7) from moving laterally and improve the radial runout detection accuracy.

[0020] In addition, a limit block 12 is provided on one or both ends of the sliding track 11 near the drive slide 2 to limit the drive slide 2 and the positioning gantry 5 on the sliding track 11. A flexible anti-collision block is provided on the inner side of the limit block 12.

[0021] The directional words "outer," "inner," "vertical," "end," and "side" mentioned in this article are based on... Figures 1-2 The orientations or positional relationships shown in the accompanying drawings are not intended to limit the devices, elements, or components to a particular orientation, or to require them to be constructed and operated in a particular orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the terms "above" and "inside" may also be used in certain situations to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0023] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting radial runout of a motor shaft, characterized in that: The device includes a drive motor, a flexible transmission head, a measuring instrument, and a positioning gantry. The flexible transmission head is located at the drive end of the drive motor and is used for flexible friction drive and automatic center adaptation. A friction transmission conical hole is provided on the outer end face of the flexible transmission head. The central axis of the friction transmission conical hole is coaxial with the rotation center line of the drive motor. The motor under test is positioned on the positioning gantry and is positioned opposite to the drive motor. The cone angle of the friction transmission conical hole is consistent with the end chamfer of the motor under test's shaft. Under the action of relative thrust, the end of the shaft is inserted into the friction transmission conical hole, and the end chamfer abuts against the conical surface of the friction transmission conical hole. The drive motor drives the shaft to rotate through the flexible transmission head. The measuring instrument is located directly above the shaft and is used to measure the radial runout of the shaft.

2. The motor shaft radial runout detection device according to claim 1, characterized in that: It also includes a base plate and a sliding rail. The sliding rail is arranged longitudinally on the base plate. The drive motor is slidably mounted on the sliding rail via a drive slide block. The positioning gantry is also arranged on the sliding rail.

3. The motor shaft radial runout detection device according to claim 2, characterized in that: The positioning gantry is equipped with a clamping mechanism. The center of the positioning gantry is a rectangular positioning area. The flange seat of the motor under test is inserted into the positioning area. The clamping mechanism includes a clamping bolt and a pressure plate. The clamping bolt is threadedly connected to the upper crossbeam of the positioning gantry. Adjustment grooves are provided on the two side columns of the positioning gantry. The two ends of the pressure plate are slidably disposed in the adjustment grooves and are horizontal. The clamping bolt drives the pressure plate to rise and fall to clamp the top surface of the flange seat.

4. The motor shaft radial runout detection device according to claim 3, characterized in that: It also includes adjusting pads, which are disposed on both sides and bottom of the positioning area. The adjusting pads on both sides are used in pairs to adjust the gap between the positioning gantry and the two sides of the flange seat.

5. The motor shaft radial runout detection device according to any one of claims 1 to 4, characterized in that: The flexible transmission head is made of polyurethane.

6. The motor shaft radial runout detection device according to claim 5, characterized in that: A limit block is provided at the end of the sliding track to limit the drive slide block to be located on the sliding track, and a flexible anti-collision block is provided on the inner side of the limit block.

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