On-line measuring device for radial clearance of motor

Abstract

The utility model relates to a motor radial clearance on-line measuring device, belongs to the technical field of motor intelligent equipment research and development, and solves the technical problems that the conventional motor radial clearance detection needs a clamping tool, the measurement efficiency is low, the measurement subjectivity is large, the batch detection cannot be met and the like. According to the solution, the motor radial clearance on-line measuring device comprises a base; a support platform; the thrust adjusting unit is arranged on the supporting platform, the thrust adjusting unit comprises a thrust air cylinder and a high-precision pressure adjusting valve, the extending end of the thrust air cylinder is connected with a clamping workbench, and the clamping workbench comprises an upper clamping table and a lower clamping table; and the graph acquisition and measurement unit is used for acquiring the graph information of the shaft extension end face of the to-be-measured motor and performing measurement and calculation to obtain the radial clearance of the to-be-measured motor. Compared with the prior art, the device has the advantages of being high in efficiency, high in accuracy, capable of meeting batch detection, not prone to being affected by subjectivity and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor intelligent equipment research and development, and specifically relates to an online measurement device for motor radial clearance. Background Art

[0002] Electric motors provide a continuous source of power for fans, pumps, compressors, machine tools, and other applications, and are widely used across various industries. A motor's radial clearance is a key performance indicator, determining its quality. During factory inspection and maintenance, radial clearance affects key parameters such as motor noise, heat generation, and efficiency. During maintenance, radial clearance data can also predict bearing wear and lifespan. Therefore, measuring radial clearance is a critical step in motor development and manufacturing.

[0003] Different motor models and specifications have different requirements for motor radial clearance. Excessive radial clearance can easily cause abnormal noise and vibration, while insufficient radial clearance can easily lead to bearing heating and shaft seizure. Traditional motor radial clearance measurement, based on the requirements of GB / T 7345-2008, "Basic Technical Requirements for Control Motors," primarily involves securely mounting the motor horizontally and axially. The micrometer gauge probe is placed on the shaft extension surface, as close to the bearing as possible. A force, as specified in general or special technical requirements, is applied to the shaft in one direction perpendicular to the axial direction and in the opposite direction. The difference between the two micrometer gauge readings represents the radial clearance measurement. Manual measurement using feeler gauges and micrometer gauges requires various clamping tools, is highly subjective, and involves a cumbersome process, making it difficult to meet the demands of efficient and mass-produced testing. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology and solve the technical problems that the existing motor radial clearance detection requires the use of clamping tools, has low measurement efficiency, is highly subjective, and cannot meet the requirements of batch detection, the utility model provides an online motor radial clearance measurement device.

[0005] The utility model is achieved through the following technical solutions.

[0006] The utility model provides an online measuring device for radial clearance of a motor, comprising:

[0007] A base, the base being used to place the motor to be tested;

[0008] A supporting platform, the supporting platform being arranged above the base via a lifting unit;

[0009] A thrust regulating unit is provided on the supporting platform, and comprises a thrust cylinder and a high-precision pressure regulating valve. The protruding end of the thrust cylinder is connected to a clamping workbench, and the clamping workbench comprises an upper clamping table and a lower clamping table. The upper clamping table and the lower clamping table are connected by a connecting screw. The upper clamping table and the lower clamping table can slide up and down on the connecting screw. The shaft extension end of the motor to be tested is placed between the upper clamping table and the lower clamping table. When the protruding end of the thrust cylinder is extended or retracted, it drives the upper clamping table or the lower clamping table to move up and down; the high-precision pressure regulating valve is provided at the top of the thrust cylinder;

[0010] A graphic acquisition and measurement unit is used to acquire graphic information of the motor shaft extension end face to be tested and perform measurement and calculation to obtain the radial clearance of the motor to be tested. The graphic acquisition and measurement unit is arranged on the support platform through a connecting piece. The graphic acquisition and measurement unit includes a CCD industrial camera and a strip light source. The CCD industrial camera is slidable left and right on a camera bracket, and the camera bracket is connected to the connecting piece; the strip light source is arranged at the bottom of the camera bracket;

[0011] A control unit is electrically connected to the thrust cylinder, the high-precision pressure regulating valve, the CCD industrial camera and the strip light source respectively.

[0012] Furthermore, the base is a rectangular parallelepiped structure, and the base is made of damping and vibration isolation material.

[0013] Furthermore, the top surface of the base is provided with motor anchor mounting holes which are parallel to each other in front and back, and the motor to be tested is connected to the motor anchor mounting holes via bolts.

[0014] Furthermore, the lifting unit is arranged on the top surface of the base on one side of the motor foot mounting hole, and the lifting unit includes several electric lifting columns or several screw lifting columns, and the top ends of the several electric lifting columns or several screw lifting columns are connected to the support platform.

[0015] Furthermore, the lifting unit includes four groups of electric lifting columns or four groups of screw lifting columns.

[0016] Furthermore, guide rods are provided around the side walls of the thrust cylinder.

[0017] Furthermore, the lower surface of the upper clamping platform and the upper surface of the lower clamping platform are both made of a scratch-resistant flexible material.

[0018] Furthermore, pressure sensors are provided on the lower surface of the upper clamping platform and the upper surface of the lower clamping platform.

[0019] Furthermore, the connecting piece and the camera bracket are respectively provided with long holes that match each other, and fixing bolts are installed in the long holes to fix the height of the camera bracket.

[0020] The beneficial effects achieved by the utility model are as follows: the utility model uses a graphic acquisition and measurement unit and a thrust adjustment unit to realize efficient non-contact measurement, avoids manual reading errors, saves fixtures and labor, and can quickly complete the detection of batch motor radial clearance measurements, greatly improving the efficiency and accuracy of motor radial clearance measurement. In addition, the measurement rhythm can be adjusted according to specific production conditions, and online automatic data detection can be realized; the graphic acquisition and measurement unit is used to obtain the motor radial clearance data, which can be combined with the bearing life prediction model to realize online detection and monitoring of motor maintenance; the thrust adjustment unit is used to design a special force application structure to realize quantitative adjustment of the thrust, so that a single cylinder can apply a fixed force in opposite directions, thereby improving efficiency.

[0021] Compared with the existing technology, the utility model has the advantages of high efficiency, high accuracy, meeting the requirements of batch testing, and not being easily affected by subjectivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 It is a side view of the present utility model.

[0024] In the figure: 1. Base; 2. Support platform; 3. Lifting unit; 4. Thrust adjustment unit; 5. Thrust cylinder; 6. High-precision pressure regulating valve; 7. Clamping workbench; 8. Upper clamping platform; 9. Lower clamping platform; 10. Connecting screw; 11. Graphic acquisition and measurement unit; 12. Connecting piece; 13. CCD industrial camera; 14. Strip light source; 15. Camera bracket; 16. Motor foot mounting hole; 17. Guide rod; 18. Pressure sensor; 19. Long hole. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 2 As shown, an online measurement device for radial clearance of a motor includes a base 1, a support platform 2, a thrust adjustment unit 4, a graphic acquisition and measurement unit 11 and a control unit.

[0027] Base 1, used to place the motor under test, is a rectangular parallelepiped structure made of a damping and vibration-isolating material. The selection of this material reduces the impact of external environmental conditions and other objective conditions on the motor radial clearance measurement process, improving detection accuracy. The top surface of base 1 is provided with parallel motor anchor mounting holes 16. These motor anchor mounting holes 16 are bolted to the motor under test to secure it. Shims can be used for leveling if necessary.

[0028] The support platform 2 is arranged above the base 1 through the lifting unit 3. The support platform 2 plays the role of fixing and supporting other components. The lifting unit 3 realizes the lifting and lowering of the support platform 2 and further realizes the height adjustment of the thrust adjustment unit 4 and the graphic acquisition and measurement unit 11, thereby improving the accuracy of the measurement.

[0029] The lifting unit 3 is arranged on the top surface of the base 1 on one side of the motor foot mounting hole 16. The lifting unit 3 includes a plurality of electric lifting columns or a plurality of screw lifting columns. The top ends of the plurality of electric lifting columns or the plurality of screw lifting columns are connected to the support platform 2. The lifting and lowering of the plurality of electric lifting columns or the plurality of screw lifting columns realizes the lifting and lowering of the support platform 2 so that the thrust adjustment unit 4 accurately engages with the shaft extension end of the motor to be tested and the graphic acquisition and measurement unit 11 accurately collects the graphic information of the shaft extension end face of the motor to be tested.

[0030] Specifically, the lifting unit 3 includes four groups of electric lifting columns or four groups of screw lifting columns, which makes the lifting of the support platform 2 more stable.

[0031] The thrust regulating unit 4 is provided on the support platform 2. The thrust regulating unit 4 includes a thrust cylinder 5 and a high-precision pressure regulating valve 6. The thrust cylinder 5 is used to apply two opposite forces to the clamping workbench 7. The side walls of the thrust cylinder 5 are provided with guide rods 17 to play a supporting and guiding role. The protruding end of the thrust cylinder 5 is connected to the clamping workbench 7. The clamping workbench 7 includes an upper clamping platform 8 and a lower clamping platform 9. The upper clamping platform 8 and the lower clamping platform 9 are connected by a connecting screw 10. The upper clamping platform 8 and the lower clamping platform 9 can slide up and down on the connecting screw 10. The distance between the upper clamping platform 8 and the lower clamping platform 9 can be controlled by the connecting screw 10 to ensure that it is greater than the width of the shaft extension end of the motor to be tested. The shaft extension end of the motor to be tested is placed between the upper clamping platform 8 and the lower clamping platform 9. When the protruding end of the thrust cylinder 5 extends or retracts, it drives the upper clamping platform 8 or the lower clamping platform 9 to move up and down. When the protruding end of the thrust cylinder 5 extends, it drives the upper clamping platform 8 to move downward to engage the shaft extension end of the motor to be tested. When the protruding end of the thrust cylinder 5 retracts, it drives the lower clamping platform 9 to move upward to engage the shaft extension end of the motor to be tested. The lower surface of the upper clamping platform 8 and the upper surface of the lower clamping platform 9 are both made of scratch-resistant flexible materials. This arrangement can prevent the shaft extension end of the motor to be tested from being scratched during the measurement process. The lower surface of the upper clamping platform 8 and the upper surface of the lower clamping platform 9 are both provided with pressure sensors 18, and the pressure sensors 18 can monitor the applied force. The high-precision pressure regulating valve 6 is arranged at the top of the thrust cylinder 5, and the high-precision pressure regulating valve 6 can quantitatively adjust the two opposite applied forces.

[0032] The image acquisition and measurement unit 11 is used to collect the end face graphics of the motor shaft extension under test and perform measurements to calculate the radial clearance of the motor under test. The image acquisition and measurement unit 11 is mounted on the support platform 2 via a connector 12. The image acquisition and measurement unit 11 includes a CCD industrial camera 13 and a bar light source 14. The CCD industrial camera 13 is primarily used to locate the motor under test to ensure the effectiveness of data acquisition. The CCD industrial camera 13 is mounted on a camera bracket 15 for sliding movement, thereby enabling lateral adjustment of the CCD industrial camera. The camera bracket 15 is connected to the connector 12. The connector 12 and the camera bracket 15 are each provided with matching elongated holes 19. The elongated holes 19 are provided with fixing bolts to secure the height of the camera bracket 15. The position of the fixing bolts in the elongated holes 19 can be determined based on the height of the motor shaft extension under test. This further enables the height adjustment of the CCD industrial camera 13, thereby improving the accuracy of the image acquisition and measurement unit 11. The bar light source 14 is located at the bottom of the camera bracket 15 and is used for illumination. The motor radial clearance data obtained by selecting the graphic acquisition and measurement unit 11 can be combined with the bearing life prediction model to realize online detection and monitoring of motor maintenance.

[0033] A control unit is electrically connected to the thrust cylinder 5 , the high-precision pressure regulating valve 6 , the CCD industrial camera 13 and the strip light source 14 .

[0034] This embodiment uses a graphic acquisition and measurement unit 11 and a thrust adjustment unit 4 to achieve efficient non-contact measurement, avoid manual reading errors, save tooling and labor, and can quickly complete the detection of batch motor radial clearance measurements, greatly improving the efficiency and accuracy of motor radial clearance measurements. In addition, the measurement rhythm can be adjusted according to specific production conditions, and online automated data detection can be realized.

[0035] The working process of this utility model is as follows:

[0036] 1) Calibrate the CCD industrial camera 13 using a checkerboard calibration plate and record the calibration position data. The checkerboard calibration plate should be located between the CCD industrial camera 13 and the upper clamping platform 8;

[0037] 2) Connect the motor to be tested to the motor anchor mounting hole 16 with bolts so that the shaft extension end face of the motor to be tested is aligned with the calibration position in 1);

[0038] 3) The control unit is electrically connected to the thrust cylinder 5, the high-precision pressure regulating valve 6, the CCD industrial camera 13, and the strip light source 14, respectively. The control unit controls the thrust of the thrust cylinder 5 through the high-precision pressure regulating valve 6. When the protruding end of the thrust cylinder 5 extends, it drives the upper clamping platform 8 to move downward to engage the shaft extension end of the motor to be tested. When the protruding end of the thrust cylinder 5 retracts, it drives the lower clamping platform 9 to move upward to engage the shaft extension end of the motor to be tested. The pressure sensor 18 monitors the applied force;

[0039] 4) When the extended end of the thrust cylinder 5 extends and retracts, the graphic acquisition and measurement unit 11 respectively collects the graphic information of the shaft extension end face of the motor to be tested, and measures the pixel difference after the two forces are applied through image preprocessing, edge detection, and image difference, calculates the radial clearance data of the motor to be tested, and takes the average value of multiple measurements as the final result.

[0040] The above describes in detail the implementation methods of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation methods. The implementation methods can still be changed within the knowledge of ordinary technicians in this field. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An online measuring device for radial clearance of a motor, characterized by: include: A base (1), the base (1) being used to place the motor to be tested; A supporting platform (2), the supporting platform (2) being arranged above the base (1) via a lifting unit (3); A thrust regulating unit (4), wherein the thrust regulating unit (4) is arranged on the supporting platform (2), and the thrust regulating unit (4) includes a thrust cylinder (5) and a high-precision pressure regulating valve (6). The protruding end of the thrust cylinder (5) is connected to a clamping table (7), and the clamping table (7) includes an upper clamping table (8) and a lower clamping table (9). The upper clamping table (8) and the lower clamping table (9) are connected by a connecting screw (10). The upper clamping table (8) and the lower clamping table (9) can slide up and down on the connecting screw (10). The shaft extension end of the motor to be tested is placed between the upper clamping table (8) and the lower clamping table (9). When the protruding end of the thrust cylinder (5) is extended or retracted, it drives the upper clamping table (8) or the lower clamping table (9) to move up and down; the high-precision pressure regulating valve (6) is arranged at the top of the thrust cylinder (5); A graphic acquisition and measurement unit (11) is used to acquire graphic information of the end face of the motor shaft to be tested and perform measurement and calculation to obtain the radial clearance of the motor to be tested. The graphic acquisition and measurement unit (11) is arranged on the support platform (2) through a connecting member (12). The graphic acquisition and measurement unit (11) includes a CCD industrial camera (13) and a strip light source (14). The CCD industrial camera (13) is slidably arranged on a camera bracket (15) to the left and right. The camera bracket (15) is connected to the connecting member (12); and the strip light source (14) is arranged at the bottom of the camera bracket (15). A control unit is electrically connected to the thrust cylinder (5), the high-precision pressure regulating valve (6), the CCD industrial camera (13) and the strip light source (14).

2. The online measurement device for motor radial clearance according to claim 1, characterized in that: The base (1) is a rectangular parallelepiped structure, and the base (1) is made of a damping and vibration-isolating material.

3. The online measurement device for motor radial clearance according to claim 1, characterized in that: The top surface of the base (1) is provided with motor anchor mounting holes (16) which are parallel to each other in front and back, and the motor to be tested is connected to the motor anchor mounting holes (16) via bolts.

4. The online measurement device for motor radial clearance according to claim 1, characterized in that: The lifting unit (3) is arranged on the top surface of the base (1) and is located on one side of the motor foot mounting hole (16). The lifting unit (3) includes a plurality of electric lifting columns or a plurality of screw lifting columns, and the top ends of the plurality of electric lifting columns or the plurality of screw lifting columns are connected to the support platform (2).

5. The online measurement device for motor radial clearance according to claim 4, characterized in that: The lifting unit (3) comprises four groups of electric lifting columns or four groups of screw lifting columns.

6. The online measuring device for radial clearance of a motor according to claim 1, characterized in that: Guide rods (17) are provided around the side walls of the thrust cylinder (5).

7. The online motor radial clearance measuring device according to claim 1, characterized in that: The lower surface of the upper clamping platform (8) and the upper surface of the lower clamping platform (9) are both made of a scratch-resistant flexible material.

8. The online measuring device for radial clearance of a motor according to claim 1, characterized in that: The lower surface of the upper clamping platform (8) and the upper surface of the lower clamping platform (9) are both provided with pressure sensors (18).

9. The online measuring device for radial clearance of a motor according to claim 1, characterized in that: The connecting piece (12) and the camera bracket (15) are respectively provided with long holes (19) that match each other, and fixing bolts are installed at the long holes (19) to fix the height of the camera bracket (15).

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