Automatic concentricity detection device and method

Abstract

The present invention discloses an automatic concentricity detection device and method, the automatic concentricity detection device comprises a measuring piece connected to a driving component, and adjusted to a position concentric with a hole to be measured under the drive of the driving component; a coordinate positioning component, which obtains the position coordinates of the hole to be measured to guide the movement of the driving component; and a control system, which records the movement distance of the driving component in multiple directions and uses it as the measured coordinates of the hole to be measured. Through the above-mentioned setting, the present invention preliminarily positions the hole to be measured through the coordinate positioning component, and guides the driving component to perform an action until the measuring piece is concentric with the hole to be measured. At this time, the measured coordinates are recorded by the control system, and finally the measured coordinates of all the holes to be measured are compared and calculated to obtain accurate concentricity data, and the degree of automation is high, which is conducive to improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to an automatic concentricity detection device and method. Background Art

[0002] At present, the injection molding products and sheet metal products used in the home appliance industry have testing and control requirements for concentricity. The concentricity of the product holes has a great impact on the assembly of the whole machine and after-sales installation and use. Unqualified concentricity will cause the air guide plate to have problems such as running jitter and loose closure after assembly, which can easily lead to after-sales complaints.

[0003] At present, the common method of testing the concentricity of injection molded products and sheet metal products is manual. When it is necessary to measure the concentricity of multiple holes on a workpiece, a fixture is first used to align the workpiece to be measured with the two holes at both ends, and then a go gauge is used to measure the middle hole. The difference between the maximum go gauge size that can pass and the holes at both ends is the concentricity deviation value.

[0004] Patent No. 201710098318.1 discloses a device for detecting the concentricity of workpiece holes. It uses a go gauge to detect the spacing between the limit block and the pipe fitting, and another go gauge to detect the spacing between the tooth plate and the baffle, and the spacing between the rocker arm and the baffle. When detecting the concentricity, the workpiece is placed on two concentricity detection positioning blocks, and one end of the pipe is pressed against the concentricity detection limit block. The concentricity of the product is determined by whether the detection sleeve can be smoothly inserted into the pipe by horizontally pushing it. The detection device relies on the go gauge to detect the distance, and there is a large error in manual operation. The specific detection value of the concentricity needs to be converted according to the go gauge value, which makes quantitative analysis difficult and prone to errors. Summary of the invention

[0005] In order to solve the defect of insufficient precision in concentricity measurement in the prior art, the present invention provides an automatic concentricity detection device and method.

[0006] The technical solution adopted by the present invention is that the concentricity automatic detection device comprises:

[0007] The measuring piece is connected to a driving assembly and is adjusted to a position concentric with the hole to be measured under the driving of the driving assembly;

[0008] A coordinate positioning component, which obtains the position coordinates of the hole to be measured to guide the movement of the driving component;

[0009] The control system records the movement distance of the driving component in multiple directions and uses it as the measured coordinates of the hole to be measured.

[0010] Preferably, the driving assembly includes at least two of an X-axis motion structure, a Y-axis motion structure and a Z-axis motion structure that are fixedly connected.

[0011] Preferably, the measuring piece is also connected to a laser distance measuring sensor for measuring the distance between the measuring piece and the plane where the hole to be measured is located.

[0012] Preferably, the X-axis motion structure includes a moving lead screw and a moving servo motor, the moving lead screw is threadedly connected to a support plate, and the Y-axis motion structure is fixed to the support plate.

[0013] Preferably, the Y-axis motion structure includes a telescopic servo motor and a telescopic lead screw, the telescopic lead screw is threadedly connected to a telescopic slide, and the Z-axis motion structure is fixed on the telescopic slide.

[0014] Preferably, the Z-axis motion structure includes a lifting servo motor, a lifting screw and a horizontal bracket threadedly mounted on the lifting screw, and the measuring member is fixedly connected to the horizontal bracket.

[0015] Preferably, the coordinate positioning assembly includes an imaging device and a mounting bracket, the mounting bracket is fixed to the support plate, and the imaging device forms the clearest image at the measuring piece.

[0016] Preferably, it also includes a base and a positioning seat for positioning the workpiece to be measured, the coordinate positioning assembly includes an imaging device and a mounting bracket, the mounting bracket is fixed on the base, and the imaging device images the clearest at the hole to be measured of the workpiece to be measured.

[0017] The present invention also proposes a method for automatic concentricity detection, which uses the automatic concentricity detection device as described above, and the steps are as follows:

[0018] Acquire the coordinate data of the hole to be measured once or multiple times, and adjust the measuring piece to a first predetermined position;

[0019] According to the coordinate data of the hole to be measured, the position of the measuring piece is adjusted along a plane parallel to the hole to be measured so as to be concentric with the hole to be measured;

[0020] The movement distance of the measuring piece adjusted along the plane where the hole to be measured is located is recorded as the measured coordinate of the hole to be measured, and the concentricity can be obtained by comparing the measured coordinates of all the holes to be measured.

[0021] Preferably, it also includes: judging whether the measuring piece is concentric with the hole to be measured, and if not, re-obtaining the secondary coordinates of the hole to be measured, and the control system readjusts the position of the measuring piece through the driving assembly according to the secondary coordinates until it is concentric with the hole to be measured.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The coordinate positioning component is used to preliminarily locate the hole to be measured, and the driving component is guided to execute the action until the measuring piece is concentric with the hole to be measured. At this time, the measured coordinates are recorded by the control system, and finally the measured coordinates of all the holes to be measured are compared and calculated to obtain accurate concentricity data. The high degree of automation is conducive to improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0025] Figure 1 is an isometric view of this embodiment;

[0026] Figure 2 is an isometric view of the front side of this embodiment;

[0027] Figure 3 is an isometric view of another perspective of this embodiment;

[0028] Figure 4 is a structural diagram of the fourth viewing angle of this embodiment;

[0029] Figure 5 This is a structural diagram of the present embodiment without the positioning seat;

[0030] Figure 6 yes Figure 5 Enlarged view of point A.

[0031] 1. Part to be tested; 2. Electric control box; 3. Touch screen; 4. Device switch; 5. Emergency stop switch; 6. Mobile servo motor; 7. Bearing seat; 8. Mobile slide rail; 9. Mobile lead screw; 10. Mobile lead screw pair; 11. Slide rail fixing seat; 12. Mounting bracket; 13. Base; 14. Telescopic slide rail pair; 15. Positioning seat; 16. Measuring part; 17. Laser ranging sensor; 18. Horizontal bracket; 19. Lifting guide rail; 20. Telescopic slide; 21. Lifting servo motor; 22. Telescopic slide rail; 23. Telescopic servo motor; 24. Telescopic lead screw; 25. Lifting lead screw; 26. Support plate; 27. Imaging device; 28. Mobile slide rail pair; 29. ​​Lifting lead screw pair. DETAILED DESCRIPTION

[0032] A concentricity automatic detection device, comprising:

[0033] The measuring member 16 is connected to a driving assembly and is adjusted to a position concentric with the hole to be measured under the driving of the driving assembly;

[0034] A coordinate positioning component, which obtains the position coordinates of the hole to be measured to guide the movement of the driving component;

[0035] The control system records the movement distance of the driving component in multiple directions and uses it as the measured coordinates of the hole to be measured.

[0036] The coordinate positioning component is used to preliminarily position the hole to be measured, and guides the driving component to execute the action until the measuring piece 16 is concentric with the hole to be measured. At this time, the actual measured coordinates are recorded by the control system, and finally the measured coordinates of all the holes to be measured are compared and calculated to obtain accurate concentricity data. The high degree of automation is conducive to improving production efficiency.

[0037] The driving assembly includes at least two of the X-axis motion structure, the Y-axis motion structure and the Z-axis motion structure that are fixedly connected. The measuring piece 16 is also connected to a laser distance sensor 17 for measuring the distance between the measuring piece 16 and the plane where the hole to be measured is located. When measuring the concentricity between multiple holes, the dimensional error exists in one plane, so only two of the X-axis motion structure, the Y-axis motion structure and the Z-axis motion structure are required to achieve the measurement of the concentricity. However, in this solution, since the problem of the distance between multiple hole positions is involved, a motion structure in the third direction is also required to cooperate with the laser distance sensor 17 to transport the entire detection device to a predetermined position close to the hole to be measured, so as to facilitate the subsequent measurement of the concentricity.

[0038] The X-axis motion structure includes a moving screw 9 and a moving servo motor 6, the moving screw 9 is threadedly connected to a support plate 26, and the Y-axis motion structure is fixed to the support plate 26. The Y-axis motion structure includes a telescopic servo motor 23 and a telescopic screw 24, the telescopic screw 24 is threadedly connected to a telescopic slide 20, and the Z-axis motion structure is fixed to the telescopic slide 20. The Z-axis motion structure includes a lifting servo motor 21, a lifting screw and a horizontal bracket 18 threadedly sleeved on the lifting screw, and the measuring member 16 is fixedly connected to the horizontal bracket 18.

[0039] It also includes a base 13 and a positioning seat 15 for positioning the workpiece to be measured, and the coordinate positioning assembly includes an imaging device 27 and a mounting bracket 12, the mounting bracket 12 is fixed on the support plate 26, and the imaging device 27 is most clearly imaged at the measuring piece 16. In another embodiment, the coordinate positioning assembly includes an imaging device 27 and a mounting bracket 12, the mounting bracket 12 is fixed on the base 13, and the imaging device 27 is most clearly imaged at the hole to be measured of the workpiece to be measured.

[0040] Meanwhile, the concentricity automatic detection method adopts the concentricity automatic detection device as described above, and the steps are as follows:

[0041] Acquire the coordinate data of the hole to be measured once or multiple times, and adjust the measuring member 16 to a first predetermined position;

[0042] According to the coordinate data of the hole to be measured, the position of the measuring piece 16 is adjusted along a plane parallel to the hole to be measured so as to be concentric with the hole to be measured;

[0043] The movement distance of the measuring piece 16 adjusted along the plane where the hole to be measured is located is recorded as the measured coordinate of the hole to be measured, and the concentricity can be obtained by comparing the measured coordinates of all the holes to be measured.

[0044] It also includes: judging whether the measuring piece 16 is concentric with the hole to be measured, if not, re-obtaining the secondary coordinates of the hole to be measured, and the control system readjusting the position of the measuring piece 16 through the driving assembly according to the secondary coordinates until it is concentric with the hole to be measured.

[0045] Embodiment 1: A concentricity automatic detection device, such as Figure 1-3 As shown, it includes a flat base 13, on which a positioning seat 15 for positioning the test piece 1 is installed. The positioning seat 15 is in the shape of a vertical right-angle folded plate. A pair of bearing seats 7 are also fixed on the base 13. A longer moving screw rod 9 is installed on the bearing seat 7 through a pair of bearings. One end of the moving screw rod 9 passes through one of the bearing seats 7 and is connected to a moving servo motor 6.

[0046] The moving screw rod 9 is parallel to the long side of the positioning seat 15, and a horizontal support plate 26 is threadedly connected to the moving screw rod 9 through the moving screw rod pair 10. At the same time, in order to facilitate the translation of the support plate 26 under the drive of the moving screw rod 9, a moving slide rail 8 is arranged on the base 13. The support plate 26 and the moving screw rod pair 10 are fixed as a whole and slide in the moving slide rail 8 through the moving slide rail pair 28. When the moving servo motor 6 is started, the support plate 26 can be driven to move along the moving screw rod 9.

[0047] The support plate 26 is fixedly mounted with a slide rail fixing seat 11, which is vertically mounted, and a telescopic slide 20 is slidably mounted thereon, and the telescopic slide 20 is connected to the slide rail fixing seat 11 through a telescopic slide rail pair 14, and the sliding direction of the telescopic slide 20 is perpendicular to the moving screw 9. At the same time, a telescopic servo motor 23 is also fixed on the support plate 26, and a telescopic screw 24 is also horizontally mounted on the slide rail fixing seat 11, one end of the telescopic screw 24 is connected to the telescopic servo motor 23, and the telescopic slide 20 is threadedly sleeved on the telescopic screw 24. When the telescopic servo motor 23 is started, the telescopic slide 20 can be driven to slide and retract in a direction perpendicular to the moving screw 9.

[0048] A vertical lifting screw 25 is installed on the back of the telescopic slide 20, one end of which passes through the telescopic slide 20 and is connected to a lifting servo motor 21, which is fixed to the top of the telescopic slide 20. A horizontal bracket 18 is threadedly sleeved on the lifting screw 25 through a lifting screw pair 29, and the other end of the horizontal bracket 18 extends toward the positioning seat 15. In order to achieve smooth lifting and sliding of the horizontal bracket 18 under the action of the lifting screw 25, a lifting guide rail 19 is provided on the side of the telescopic slide 20, and a part of the horizontal bracket 18 protrudes and is slidably installed in the lifting guide rail 19.

[0049] like Figure 4-6 As shown, a measuring piece 16 and a laser distance sensor 17 are fixedly mounted on the outward end of the horizontal bracket 18. In this embodiment, the measuring piece 16 is a conical rod with a conical end, and the laser distance sensor 17 is a common infrared distance meter.

[0050] The coordinate positioning assembly includes an imaging device 27 and a mounting bracket 12, and the mounting bracket 12 is fixed on the support plate 26. In this embodiment, the mounting bracket 12 realizes the multi-angle rotatable function of the imaging device 27 through a spherical universal joint, and other structures such as a telescopic structure, a deformable metal rod, or a connecting rod mechanism can also be used, as long as the position of the imaging device 27 can be adjusted. The imaging device 27 can be a device with an imaging feedback function such as a miniature camera or a camera. Since the spacing between the imaging device 27 and the tapered rod can be adjusted to a fixed spacing, the imaging of the imaging device 27 at the tapered rod can be made clearest by adjusting the spacing or adjusting the focal length of the imaging.

[0051] If necessary, an electric control box 2 is also installed on the base 13, and a touch screen 3, a device switch 4 and an emergency stop switch 5 are installed on the electric control box 2 to control the start and stop of the entire device.

[0052] The specific method is as follows: firstly, place the workpiece 1 to be measured on the positioning seat 15 and press it tightly to position it. At this time, the hole to be measured is located on the side of the positioning seat 15 close to the moving screw 9. Turn on the laser distance sensor 17, and irradiate the laser on the workpiece 1 entity around the hole to be measured to measure the distance between the hole to be measured and the tapered rod. After obtaining the distance, the control system starts the moving servo motor 6, and drives the entire support plate 26 to translate in the X-axis direction through the moving screw 9 until the tapered rod reaches a relatively close position of the hole to be measured.

[0053] At this time, the imaging device 27, such as a camera, takes the first image of the hole to be measured, and obtains a relative coordinate by judging the position of the hole. The control system controls the telescopic servo motor 23 and the lifting servo motor 21 to start successively according to the coordinate, thereby driving the conical rod to adjust the position on the Y-axis and the Z-axis until the measuring rod is located at a position concentric with the hole to be measured according to the coordinate, and then starts the mobile servo motor 6 to push the conical rod forward along the X-axis direction until the conical surface of the conical rod abuts against the side wall of the hole to be measured and reaches a certain pressure. By detecting the size of the pressure, the mobile servo motor 6 stops in time. At this time, the conical rod is inserted into the hole to be measured and fits the hole wall.

[0054] In order to verify whether the conical rod is concentric with the hole to be measured at this time, the imaging device 27 needs to perform secondary imaging. Since the conical rod is driven by the mobile servo motor 6 to perform secondary displacement along the X-axis, the synchronous imaging device 27 also performs secondary translation. It should be noted that the imaging device 27 is focused on the conical rod, so the position of the hole to be measured obtained during the first imaging is not the clearest and most accurate. However, with the secondary displacement of the conical rod, the focus of the imaging device 27 coincides with the position of the hole to be measured during the secondary imaging. Therefore, it is possible to accurately determine whether the conical rod is in contact with the hole to be measured at this time, that is, to determine whether the conical rod is concentric with the hole to be measured.

[0055] If it is completely fitted, the control system records the number of rotations of the telescopic servo motor 23 and the lifting servo motor 21 in the process and converts it into the moving distance to obtain the values ​​of the measured hole in the Y-axis and Z-axis directions, which are recorded as the measured coordinates. After measuring the measured coordinates of all the holes to be measured, the final concentricity value can be obtained through comparative calculation and compared with the allowable error range to obtain a conclusion on whether the tested piece 1 meets the requirements.

[0056] If it is not completely fitted, it means that the conical rod is not concentric with the hole to be measured. At this time, the secondary coordinates of the hole to be measured are regenerated based on the secondary imaging. The control system drives and adjusts the conical rod according to the secondary coordinates until the cone is concentric with the hole to be measured again. Then the image is imaged again for judgment, and the above steps are repeated according to the results.

[0057] Embodiment 2: The difference from Embodiment 1 is that the imaging device 27 is directly fixed on the base 13, and the focusing position of the best imaging corresponds to the position of the hole to be measured. During the first imaging, the coordinates of the hole to be measured are generated and the measuring piece 16 is guided to adjust the position. During the second imaging, it is determined whether the measuring piece 16 is concentric with the hole to be measured, and corresponding actions are performed according to the results. Please refer to the contents in Embodiment 1.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Automatic concentricity detection device, characterized in that: include, A measuring piece is connected to a driving assembly and is adjusted to a position concentric with the hole to be measured under the drive of the driving assembly. The driving assembly includes an X-axis motion structure, a Y-axis motion structure and a Z-axis motion structure that are fixedly connected. The measuring piece is also connected to a laser distance sensor for measuring the distance between the measuring piece and the plane where the hole to be measured is located. A coordinate positioning component, which obtains the coordinates of the position of the hole to be measured to guide the movement of the driving component; the coordinate positioning component includes an imaging device and a mounting bracket, the mounting bracket is fixed to the support plate in the X-axis motion structure, and the imaging device is most clearly imaged at the measuring piece; or, further includes a base and a positioning seat for positioning the workpiece to be measured, the coordinate positioning component includes an imaging device and a mounting bracket, the mounting bracket is fixed to the base, and the imaging device is most clearly imaged at the hole to be measured of the workpiece to be measured; A control system controls the X-axis motion structure to drive the measuring piece to a position closer to the hole to be measured according to the distance measured by the laser ranging sensor; and controls the Y-axis motion structure and the Z-axis motion structure to drive the measuring piece to adjust the position in the Y-axis direction and the Z-axis direction according to the position coordinates of the hole to be measured, until the measuring piece is inserted into the hole to be measured and completely fits with the hole wall, then records the movement distance of the drive assembly in the Y-axis direction and the Z-axis direction as the measured coordinates of the hole to be measured, and compares the measured coordinates of all holes to be measured on the workpiece to be measured to obtain concentricity.

2. The automatic concentricity detection device according to claim 1, characterized in that: The X-axis motion structure comprises a moving lead screw and a moving servo motor. A support plate is threadedly connected to the moving lead screw, and the Y-axis motion structure is fixed on the support plate.

3. The automatic concentricity detection device according to claim 1, characterized in that: The Y-axis motion structure comprises a telescopic servo motor and a telescopic lead screw, the telescopic lead screw is threadedly connected with a telescopic slide, and the Z-axis motion structure is fixed on the telescopic slide.

4. The automatic concentricity detection device according to claim 1, characterized in that: The Z-axis motion structure includes a lifting servo motor, a lifting screw and a horizontal bracket threadedly sleeved on the lifting screw, and the measuring piece is fixedly connected to the horizontal bracket.

5. The concentricity automatic detection method is characterized by: The automatic concentricity detection device according to any one of claims 1 to 4 is used, and the steps are as follows: Acquire the coordinate data of the hole to be measured once or multiple times, and adjust the measuring piece to a first predetermined position; According to the coordinate data of the hole to be measured, the position of the measuring piece is adjusted along a plane parallel to the hole to be measured so as to be concentric with the hole to be measured; The movement distance of the measuring piece adjusted along the plane where the hole to be measured is located is recorded as the measured coordinate of the hole to be measured, and the concentricity can be obtained by comparing the measured coordinates of all the holes to be measured.

6. The method for automatic concentricity detection according to claim 5, characterized in that: Also includes: It is determined whether the measuring piece is concentric with the hole to be measured. If not, the secondary coordinates of the hole to be measured are obtained again. The control system readjusts the position of the measuring piece through the driving assembly according to the secondary coordinates until it is concentric with the hole to be measured.

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