Motor punching sheet detection device based on visual technology

Abstract

The utility model relates to a motor punching sheet detection device based on a visual technology, belongs to the technical field of motor intelligent equipment research and development, and solves the technical problems that existing punching sheet defect detection is low in efficiency, low in accuracy, easy to be subjectively influenced, difficult in batch punching sheet detection and the like. According to the solution, the motor punching sheet detection device based on the visual technology comprises a frame unit, an image acquisition unit, a driving unit and a control unit, the frame unit comprises a base, a first supporting frame and a second supporting frame are arranged at the left end and the right end of the base respectively, and the first supporting frame and the second supporting frame are connected through a cross beam. A rotating platform is embedded in the middle of the base, and a punching sheet fixing device is arranged on the rotating platform; the image acquisition unit comprises a CCD industrial camera, a line laser contourgraph, a point light source and a backlight source; the driving unit comprises a first linear motor arranged on the second supporting frame and a second linear motor arranged on the cross beam. Compared with the prior art, the utility model has the advantages of high efficiency, high accuracy, less susceptibility to subjectivity and the like, and meets the motor manufacturing requirements of batch punching detection.

Description

Technical Field

[0001] The utility model belongs to the technical field of research and development of motor intelligent equipment, and particularly relates to a motor punching sheet detection device based on vision technology. Background Technique

[0002] As the core component of the stator and rotor, the quality of the punching sheet directly determines the performance and energy consumption of the motor. Therefore, in the motor manufacturing industry, the processing and quality detection of the punching sheet are particularly important.

[0003] The traditional raw material of the motor punching sheet is silicon steel sheet. For convenient transportation, the silicon steel material is presented in the form of a silicon steel coil. In the production and manufacturing of the iron core, the silicon steel sheet is stamped into shape by a large stamping device and then sent to the next production process through the lamination process. The detection of the punching sheet quality mainly includes two aspects. One is the burr of the punching sheet, and the other is the warping deformation of the edge of the punching sheet. The defects of the motor punching sheet will restrict the production and manufacturing level of the motor, thus greatly affecting the various parameters of the motor.

[0004] For the defect detection of the punching sheet, the existing method is to rely on manual sampling inspection with special measuring tools or detection after lamination. However, due to the extremely large number of punching sheets, the manual inspection method has great subjectivity and the detection efficiency and accuracy are limited, which greatly reduces the detection quality of the punching sheet, cannot meet the requirements of lean production in the workshop and green manufacturing of the motor, and even causes material waste. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art and solve the technical problems such as low efficiency, low accuracy, easy to be subjectively affected, and difficulty in batch detection of existing punching sheet defects, the utility model provides a motor punching sheet detection device based on vision technology.

[0006] The utility model is realized through the following technical solutions.

[0007] The utility model provides a motor punching sheet detection device based on vision technology, which includes a frame unit, an image acquisition unit, a driving unit and a control unit;

[0008] The frame unit includes a base, on the left and right ends of the base are respectively provided with a first support frame and a second support frame, on the first support frame is provided with an I-shaped guide rail, and the first support frame and the second support frame are connected by a cross beam; a rotating platform is embedded in the middle of the base, and a punching sheet fixing device is provided on the rotating platform;

[0009] The image acquisition unit includes a CCD industrial camera, a line laser profiler, a point light source, and a backlight. The CCD industrial camera is disposed on the left side of the first connecting member, the line laser profiler is disposed on the right side of the first connecting member, and the point light source is disposed on the top of the first connecting member. The backlight is disposed on the rotating platform on one side of the punching sheet fixing device.

[0010] The driving unit includes a first linear motor disposed on the second support frame and a second linear motor disposed on the cross beam. The structures of the first linear motor and the second linear motor are the same. The first linear motor includes a base, a motor, a lead screw, a slide rail, a slider, and a first workbench. The motor, the lead screw, and the slide rail are disposed on the base. The output shaft of the motor is fixedly connected to the lead screw. The slide rails are located on both sides of the lead screw. The slider can reciprocate up and down along the slide rail. The slider is fixedly connected to the first workbench of the first linear motor and the second workbench of the second linear motor respectively. The first workbench is fixedly connected to the second connecting member. A third connecting member is disposed on the second workbench, and the third connecting member is fixedly connected to the cross beam. The cross beam reciprocates up and down along the I-shaped guide rail and the second workbench.

[0011] The control unit is electrically connected to the rotating platform, the CCD industrial camera, the line laser profiler, the point light source, the backlight, the first linear motor, and the second linear motor respectively.

[0012] Further, the base is of a cuboid structure and is made of a damping vibration isolation material.

[0013] Further, a groove is provided on the cross beam, and the base of the second linear motor is fixedly connected to the groove through the third connecting member.

[0014] Further, the width dimension of the third connecting member is equal to the width dimension of the groove.

[0015] Further, the upper surface of the rotating platform is flush with the upper surface of the base. A rotating module is provided at the bottom of the rotating platform, and the rotating module is embedded in the base.

[0016] Further, the punching sheet fixing device includes two parallel horizontal connecting rods. A plurality of vertical connecting rods are provided on the two horizontal connecting rods, and a plurality of suction cups are evenly distributed on the vertical connecting rods.

[0017] Further, the number of the vertical connecting rods and the spacing between the vertical connecting rods are set according to the specifications of the punching sheet.

[0018] Further, the upper part of the suction cup is in a flared shape.

[0019] The beneficial effects achieved by the present utility model are as follows: The present utility model selects an image acquisition unit and a driving unit to achieve efficient non-contact measurement. It can quickly complete the detection of both batch motor punching sheets and single motor punching sheets, greatly improving the efficiency and accuracy of punching sheet defect detection. The selection of a CCD industrial camera can pre-position the punching sheet to be measured to ensure the effectiveness of data acquisition. After the positioning work is completed, a line laser profiler is used to scan and collect the point cloud data of the punching sheet to be measured, greatly optimizing the efficiency of data acquisition and reducing the work intensity. Through the processing of point cloud data, the precise three-dimensional structure of the punching sheet to be measured can be obtained, and the detection is not easily affected subjectively, more intuitively identifying various defect characteristics of the punching sheet, greatly improving the efficiency of motor punching sheet defect detection, and meeting the motor manufacturing requirements for batch punching sheet detection. The selection of the first linear motor and the second linear motor provides a larger space for vertical movement, which is conducive to placing the punching sheet on the rotating platform.

[0020] Compared with the prior art, the present utility model has the advantages of high efficiency, high accuracy, not being easily affected by subjectivity, and meeting the motor manufacturing requirements for batch punching sheet detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the present utility model from another angle.

[0023] In the figure: 1, base; 2, first support frame; 3, second support frame; 4, I-shaped guide rail; 5, cross beam; 6, rotating platform; 7, punching sheet fixing device; 8, CCD industrial camera; 9, line laser profiler; 10, point light source; 11, backlight; 12, first connecting piece; 13, first linear motor; 14, second linear motor; 15, base; 16, motor; 17, lead screw; 18, slide rail; 19, slider; 20, first workbench; 21, second workbench; 22, second connecting piece; 23, third connecting piece; 24, groove; 25, horizontal connecting rod; 26, vertical connecting rod; 27, suction cup. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0025] As Figures 1 to 2 shown, a motor punching sheet detection device based on vision technology includes a frame unit, an image acquisition unit, a driving unit, and a control unit.

[0026] The frame unit includes a base 1, which has a cuboid structure and is made of a damping vibration isolation material. The selection of the damping vibration isolation material can further reduce the influence of external environmental objective conditions on the detection and improve the detection accuracy. On the left and right ends of the base 1, a first support frame 2 and a second support frame 3 are respectively provided. An I-shaped guide rail 4 is provided on the first support frame 2. The first support frame 2 and the second support frame 3 are connected by a cross beam 5. A groove 24 is provided on the cross beam 5. The base 15 of the second linear motor 14 is fixedly connected to the groove 24 through a third connecting member 23. The width dimension of the third connecting member 23 is equal to the width dimension of the groove 24, which can make the connection between the cross beam 5 and the second linear motor 14 closer. A rotating platform 6 is embedded in the middle of the base 1. The upper surface of the rotating platform 6 is flush with the upper surface of the base 1. A rotating module is provided at the bottom of the rotating platform 6 and is embedded in the base 1. The setting of the rotating module makes the rotation of the rotating platform more stable. An armature fixing device 7 is provided on the rotating platform 6. The armature fixing device 7 includes two parallel horizontal connecting rods 25. A number of vertical connecting rods 26 are provided on the two horizontal connecting rods 25. The number and the spacing between the vertical connecting rods 26 are set according to the specifications of the armature, so as to adapt to the detection of armatures with various size specifications. A number of suction cups 27 are evenly distributed on the vertical connecting rods 26. The suction cups 27 are used to fix the armature. The upper part of the suction cup 27 is in a flared shape, and the flared shape design is convenient for more effectively fixing the armature.

[0027] The image acquisition unit includes a CCD industrial camera 8, a line laser profiler 9, a point light source 10 and a backlight 11. The CCD industrial camera 8 is provided on the left side of the first connecting member 12. The CCD industrial camera 8 is mainly used for pre-positioning the armature to be measured to ensure the effectiveness of data acquisition. The line laser profiler 9 is provided on the right side of the first connecting member 12. The line laser profiler 9 scans and acquires the point cloud data of the armature to be measured, greatly optimizing the data acquisition efficiency, reducing the work intensity. Through the processing of the point cloud data, the precise three-dimensional structure of the armature can be obtained. The detection is not easily affected subjectively, and various defect features of the armature can be more intuitively identified, greatly improving the efficiency of the defect detection of the motor armature. The point light source 10 is provided on the top of the first connecting member 12; the backlight 11 is provided on the rotating platform 6 on one side of the armature fixing device 7. The settings of the point light source 10 and the backlight 11 can provide illumination for the CCD industrial camera 8.

[0028] The driving unit includes a first linear motor 13 disposed on the second support frame 3 and a second linear motor 14 disposed on the cross beam 5. The first linear motor 13 and the second linear motor 14 have the same structure. The first linear motor 13 includes a base 15, a motor 16, a lead screw 17, a slide rail 18, a slider 19 and a first workbench 20. The motor 16, the lead screw 17 and the slide rail 18 are disposed on the base 15. The output shaft of the motor 16 is fixedly connected to the lead screw 17. The slide rail 18 is located on both sides of the lead screw 17. The slider 19 can reciprocate up and down along the slide rail 18. The slider 19 is fixedly connected to the first workbench 20 of the first linear motor 13 and the second workbench 21 of the second linear motor 14 respectively. In this way, when the slider 19 reciprocates along the slide rail 18, it drives the first workbench 20 and the second workbench 21 to also perform reciprocating motions. The first workbench 20 is fixedly connected to the second connecting member 22. In this way, when the first workbench 20 reciprocates up and down, the CCD industrial camera 8 and the line laser profiler 9 in the image acquisition unit also reciprocate up and down with the first workbench 20, realizing the acquisition of three-dimensional point cloud data. A third connecting member 23 is provided on the second workbench 21. The third connecting member 23 is fixedly connected to the cross beam 5. The cross beam 5 reciprocates up and down along the I-shaped guide rail 4 and the second workbench 21. The up and down movements of the cross beam 5 and the first workbench 20 in the vertical direction can meet the detection of various punching sheet specifications.

[0029] The control unit is electrically connected to the rotary platform 6, the CCD industrial camera 8, the line laser profiler 9, the point light source 10, the backlight 11, the first linear motor 13 and the second linear motor 14 respectively.

[0030] The utility model selects the image acquisition unit and the driving unit, realizing efficient non-contact measurement. It can quickly complete the detection for both batch motor punching sheets and single motor punching sheets, greatly improving the efficiency and accuracy of punching sheet defect detection.

[0031] The working process of the utility model is as follows:

[0032] 1) Calibrate the CCD industrial camera 8 and the line laser profiler 9 by using a calibration pin gauge or a calibration ball or a calibration plate;

[0033] 2) Select the appropriate number of vertical connecting rods 26 and the spacing between the vertical connecting rods 26 according to the type of punching sheet to be measured, ensuring that the suction cup 27 can accurately fix the punching sheet transferred from the previous process;

[0034] 3) Turn on the control unit. The control unit is electrically connected to the rotary platform 6, the CCD industrial camera 8, the line laser profiler 9, the point light source 10, the backlight 11, the first linear motor 13 and the second linear motor 14 respectively;

[0035] 4) The control unit controls the first linear motor 13 and the second linear motor 14 for driving adjustment, so as to drive the CCD industrial camera 8 to move along the vertical direction for pre-positioning the punching sheet to be measured. The punching sheet is fixedly rotated on the rotary platform 6, and the line laser profiler 9 collects the three-dimensional point cloud data of the punching sheet to be measured. The collected three-dimensional point cloud data is preprocessed and feature-fitted, and data processing methods such as point cloud denoising, downsampling, and point cloud stitching are used for analysis and calculation, so as to realize the identification and detection of defect features such as burrs adhered to the edge of the punching sheet slot, damage to the edge of the punching sheet slot, and warping deformation of the edge of the punching sheet slot.

[0036] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, the embodiments can still be changed. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A motor punching detection device based on visual technology, characterized in that: It includes a frame unit, an image acquisition unit, a driving unit and a control unit; The frame unit comprises a base (1), a first support frame (2) and a second support frame (3) are respectively provided at the left and right ends of the base (1), an I-shaped guide rail (4) is provided on the first support frame (2), and the first support frame (2) and the second support frame (3) are connected by a crossbeam (5); a rotating platform (6) is embedded in the middle of the base (1), and a punching sheet fixing device (7) is provided on the rotating platform (6); The image acquisition unit comprises a CCD industrial camera (8), a line laser profiler (9), a point light source (10) and a backlight source (11); the CCD industrial camera (8) is arranged on the left side of the first connecting member (12), the line laser profiler (9) is arranged on the right side of the first connecting member (12), and the point light source (10) is arranged on the top of the first connecting member (12); the backlight source (11) is arranged on the rotating platform (6) at one side of the punching fixing device (7); The driving unit comprises a first linear motor (13) arranged on the second support frame (3) and a second linear motor (14) arranged on the crossbeam (5); the first linear motor (13) and the second linear motor (14) have the same structure; the first linear motor (13) comprises a base (15), a motor (16), a screw rod (17), a slide rail (18), a slider (19) and a first workbench (20); the motor (16), the screw rod (17) and the slide rail (18) are arranged on the base (15); the output shaft of the motor (16) is fixedly connected to the screw rod (17); the slide rail (18) is located on both sides of the screw rod (17), the slider (19) can move back and forth up and down along the slide rail (18), the slider (19) is fixedly connected to the first workbench (20) of the first linear motor (13) and the second workbench (21) of the second linear motor (14), the first workbench (20) is fixedly connected to the second connecting member (22), the second workbench (21) is provided with a third connecting member (23), the third connecting member (23) is fixedly connected to the crossbeam (5), and the crossbeam (5) moves back and forth up and down along the I-shaped guide rail (4) and the second workbench (21); The control unit is electrically connected to the rotating platform (6), the CCD industrial camera (8), the line laser profiler (9), the point light source (10), the backlight source (11), the first linear motor (13) and the second linear motor (14) respectively.

2. The motor punching detection device based on vision technology according to claim 1 is 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 motor punching detection device based on vision technology according to claim 1 is characterized in that: The crossbeam (5) is provided with a groove (24), and the base (15) of the second linear motor (14) is fixedly connected to the groove (24) via a third connecting member (23).

4. The motor punching detection device based on vision technology according to claim 3 is characterized in that: The width dimension of the third connecting member (23) is equal to the width dimension of the groove (24).

5. The motor punching detection device based on vision technology according to claim 1 is characterized in that: The upper surface of the rotating platform (6) is flush with the upper surface of the base (1); a rotating module is provided at the bottom of the rotating platform (6); and the rotating module is embedded in the base (1).

6. The motor punching detection device based on vision technology according to claim 1 is characterized in that: The punching sheet fixing device (7) comprises two parallel horizontal connecting rods (25), a plurality of vertical connecting rods (26) are arranged on the two horizontal connecting rods (25), and a plurality of suction cups (27) are evenly distributed on the vertical connecting rods (26).

7. The motor punching detection device based on vision technology according to claim 6 is characterized by: The number of the vertical connecting rods (26) and the spacing between the vertical connecting rods (26) are set according to the specifications of the punching sheets.

8. The motor punching detection device based on vision technology according to claim 6 is characterized by: The upper part of the suction cup (27) is in a trumpet shape.

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