Hole pitch measuring system

Abstract

The utility model relates to the technical field of precision measurement, in particular to a hole pitch measurement system which comprises a substrate, a to-be-measured piece fixing mechanism, an image acquisition equipment fixing mechanism, a lighting source, image acquisition equipment, a template matching unit and an image processing unit. The to-be-tested piece fixing mechanism is used for clamping the two ends of the to-be-tested piece; the image acquisition equipment fixing mechanism is used for fixing the illumination light source and the image acquisition equipment; a plurality of to-be-tested piece templates are stored in the template matching unit, and the template matching unit is in communication connection with the image acquisition equipment and is used for receiving image information acquired by the image acquisition equipment and matching the image information with the to-be-tested piece templates so as to determine a real area of a to-be-tested piece; and the image processing unit is in communication connection with the template matching unit, and is used for receiving the real area of the to-be-tested piece matched by the template matching unit, extracting coordinate information of the holes in the real area of the to-be-tested piece, and further calculating the distance between the holes.

Description

Technical Field

[0001] The present application relates to the field of precision measurement technology, and in particular to a hole spacing measurement system. Background Art

[0002] In industrial production, the dimensions of industrial parts need to be accurately measured, among which the hole spacing of industrial parts is an important parameter. The following problems are often encountered:

[0003] (1) Highly trained operators: Traditional methods usually require highly trained operators to use complex measurement equipment, which requires companies to invest a lot of time and resources in training. In addition, highly trained personnel are still prone to errors in operation, resulting in inaccurate measurement results.

[0004] (2) Time-consuming operation: Traditional methods usually require multiple steps, such as calibrating instruments, manual measurement, and recording data. These steps result in long measurement times, which reduces production efficiency.

[0005] (3) Not suitable for automated production lines: The complexity of traditional methods and the need for manual operation make them unsuitable for automated production lines, which may limit real-time quality control and high-yield manufacturing.

[0006] (4) High-precision requirements: In some application scenarios, high-precision measurement of the hole spacing is required. Traditional measurement methods may not meet this requirement, so a more accurate measurement solution needs to be found.

[0007] (5) Non-contact measurement requirements: In some special scenarios, traditional measurement methods require physical contact and are not suitable for certain objects or environments. Therefore, a non-contact measurement solution is needed. Summary of the invention

[0008] The embodiment of the present application provides a hole spacing measurement system that can improve measurement accuracy and measurement efficiency.

[0009] The hole spacing measurement system provided in the embodiment of the present application includes:

[0010] substrate,

[0011] The device for fixing the test piece includes a first fixing mechanism and a second fixing mechanism. The first fixing mechanism and the second fixing mechanism are symmetrical in structure. The first fixing mechanism includes a first clamping member capable of clamping the test piece. The second fixing mechanism includes a second clamping member capable of clamping the test piece. The first clamping member and the second clamping member are respectively used to clamp two ends of the test piece.

[0012] The first fixing mechanism and the second fixing mechanism are arranged on the substrate, and their positions on the substrate are adjustable.

[0013] The image acquisition device fixing mechanism comprises a support frame, the support frame comprises a first leg and a second leg arranged on a substrate, and also comprises a crossbeam connecting the first leg and the second leg, and an illumination light source and an image acquisition device are fixed on the crossbeam.

[0014] The illumination source and image acquisition device are located above the fixture of the test piece.

[0015] The template matching unit stores a plurality of test piece templates. The template matching unit is connected to the image acquisition device for communication, and is used to receive image information acquired by the image acquisition device, and match the image information with the test piece template, so as to determine the real area of ​​the test piece.

[0016] The image processing unit is communicatively connected with the template matching unit, and is used to receive the real area of ​​the test piece matched by the template matching unit, and extract the coordinate information of the holes in the real area of ​​the test piece, and then calculate the distance between the holes.

[0017] According to the aforementioned embodiment of the present application, the hole spacing measurement system further includes

[0018] The measurement result output unit is communicatively connected to the image processing unit and is used to receive the measurement result output by the image processing unit.

[0019] According to any of the aforementioned embodiments of the present application, the hole spacing measurement system further includes

[0020] The control interface includes a measurement result display area, and the control interface is communicatively connected to the measurement result output unit, and is used to receive the measurement result output by the measurement result output unit and display it in the measurement result display area.

[0021] According to any of the aforementioned embodiments of the present application, the first clamping member includes a support plate, an upper clamping plate, a lower clamping plate, a screw and an adjusting screw.

[0022] The support plate is vertically arranged on the base plate.

[0023] The upper clamping plate is fixedly arranged on the side wall of the support plate and is in a horizontal state.

[0024] The lower clamping plate is slidably arranged on the side wall of the supporting plate and is in a horizontal state. The lower clamping plate is located below the upper clamping plate.

[0025] The upper clamping plate and the lower clamping plate are provided with threaded holes which match the screw rods.

[0026] The screw passes through the threaded holes on the upper clamping plate and the lower clamping plate.

[0027] The adjusting screw cooperates with the screw rod, and the height of the lower clamping plate can be adjusted by adjusting the position of the adjusting screw on the screw rod.

[0028] According to any of the aforementioned embodiments of the present application, the first fixing mechanism further includes a slider, and the support plate is fixed on the slider.

[0029] A sliding groove matched with the sliding block is arranged on the base plate.

[0030] According to any of the aforementioned embodiments of the present application, the slide groove penetrates the substrate along the length direction.

[0031] According to any of the foregoing embodiments of the present application, the hole spacing measurement system further includes a first driving mechanism and a second driving mechanism.

[0032] The first driving mechanism is connected to the slider of the first fixing mechanism and is used to drive the slider of the first fixing mechanism to move along the slide groove.

[0033] The second driving mechanism is connected to the slider of the second fixing mechanism and is used to drive the slider of the second fixing mechanism to move along the sliding groove.

[0034] According to any of the aforementioned embodiments of the present application, the first driving mechanism and the second driving mechanism have the same structure.

[0035] The first driving mechanism includes a screw rod parallel to the slide groove, and the slider of the first fixing mechanism is sleeved on the screw rod through an internal thread; the first driving mechanism also includes a motor driving the screw rod to rotate, and a speed change assembly connecting the motor and the screw rod.

[0036] The hole spacing measurement system in the embodiment of the present application uses a test piece fixing mechanism to fix the test piece, so that the test piece is at a certain distance from the substrate, and the light irradiated to the through hole on the test piece can pass through the through hole, so that the through hole on the part in the final image information is contrasted with other parts, and the recognition degree is higher. In addition, the hole spacing measurement system in the embodiment of the present application uses a template matching unit to pre-store a certain number of test piece templates, which can improve the recognition efficiency of circular holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of a hole spacing measurement system according to an embodiment of the present application;

[0038] Figure 2 It is a structural schematic diagram of a hole spacing measurement system according to another embodiment of the present application. DETAILED DESCRIPTION

[0039] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0040] See also Figure 1 and Figure 2 The embodiment of the present application provides a hole spacing measurement system 100, including a substrate 110, a DUT fixing mechanism 120, an image acquisition device fixing mechanism 130, an illumination light source 140, an image acquisition device 150, a template matching unit 160 and an image processing unit 170.

[0041] The base plate 110 is a plate-shaped component that plays a role of fixing and supporting.

[0042] The device under test fixing mechanism 120 is arranged on the substrate 110, and includes a first fixing mechanism 121 and a second fixing mechanism 123. The first fixing mechanism 121 and the second fixing mechanism 123 are movably arranged on the substrate 110 (the positions of the first fixing mechanism 121 and the second fixing mechanism 123 on the substrate 110 are adjustable), and the first fixing mechanism 121 and the second fixing mechanism 123 have the same structure and are symmetrically arranged. The first fixing mechanism 121 includes a first clamping member 124 that can clamp the device under test S, and the second fixing mechanism 123 includes a second clamping member 125 that can clamp the device under test, and the first clamping member 124 and the second clamping member 125 are respectively used to clamp the two ends of the device under test. The positions of the first fixing mechanism 121 and the second fixing mechanism 123 on the substrate 110 are adjustable, so the positions of the first clamping member 124 and the second clamping member 125 relative to the substrate 110 are also adjustable. By adjusting the positions of the first fixing mechanism 121 and the second fixing mechanism 123 , the distance between the first clamping member 124 and the second clamping member 125 can be changed, so that the first clamping member 124 and the second clamping member 125 can clamp the test pieces of different sizes.

[0043] The image acquisition device fixing mechanism 130 is arranged on the substrate 110, and is used to fix the illumination light source 140 and the image acquisition device 150. The image acquisition device fixing mechanism 130 includes a support frame 131, and the support frame 131 includes a first leg 132 and a second leg 133 arranged on the substrate 110, and also includes a crossbeam 134 connecting the first leg 132 and the second leg 133, and the illumination light source 140 and the image acquisition device 150 are fixed on the crossbeam 134; the illumination light source 140 and the image acquisition device 150 are located above the DUT fixing mechanism 120, and the illumination light source 140 provides illumination light from above to the DUT fixed on the DUT fixing mechanism 120, and the image acquisition device 150 acquires image information of the DUT from above.

[0044] The image acquisition device 150 can be a high-resolution camera with an autofocus function that can capture images of holes on the test piece in real time. The high resolution of the camera ensures excellent image quality and can clearly capture holes of various sizes and shapes. The autofocus function can adapt to the depth and position of different holes to ensure image clarity and accuracy.

[0045] The template matching unit 160 may be a module of the central control unit. The template matching unit 160 stores a plurality of templates of the test piece. The template matching unit 160 is communicatively connected to the image acquisition device 150 to receive the image information acquired by the image acquisition device 150 and match the image information with the template of the test piece, thereby determining the real area of ​​the test piece. Template matching is to compare the template image with each location in the target image to obtain a similarity (or distance) value. If the template image has a high similarity with a certain location in the target image, then the location may be the target location. General shape matching templates, linear deformation matching templates, local deformable templates, scaling templates, etc. may be used.

[0046] The image processing unit 170 may be a module of the central control unit. The image processing unit 170 is communicatively connected to the template matching unit 160, and is used to receive the real area of ​​the test piece matched by the template matching unit 160, and extract the coordinate information of the holes in the real area of ​​the test piece, and then calculate the distance between the holes. The image processing unit 170 may be equipped with an existing advanced image processing algorithm, and can process the image captured by the camera in real time. The image processing algorithm may have the following characteristics: first, image rotation. For the real area of ​​the part in the image, the image is automatically rotated through an adaptive rotation algorithm to ensure that the straight line in the part is parallel to the image boundary; then, image preprocessing is performed to preprocess the acquired image, including filtering the noise in the image using the Otsu filtering method, the Gaussian filtering method, the corrosion and expansion of the image, etc., to reduce noise and enhance the target edge; then, the Canny operator is used for edge detection to obtain the precise edge of the target part; then, circular hole detection is performed. Based on the preprocessed image, the circular hole of the part is detected using the probabilistic Hough transform. This step can extract the circular hole features in the workpiece; finally, distance measurement is performed. For the detected circular holes, the distance between the centers of the two circles is calculated, which is the value of the part hole spacing. A sub-pixel measurement algorithm can be used to achieve sub-pixel accuracy for the position of the circular hole through the algorithm, and then the pixel distance between the circular holes is measured. The image processing unit 170 can achieve sub-pixel accurate measurement of industrial parts.

[0047] The hole spacing measurement system 100 of the embodiment of the present application uses the test piece fixing mechanism 120 to fix the test piece, so that the test piece is at a certain distance from the substrate 110, and the light irradiated to the through hole on the test piece can pass through the through hole, so that the through hole on the part in the final image information is contrasted with other parts, and the recognition degree is higher. In addition, the hole spacing measurement system 100 of the embodiment of the present application uses the template matching unit 160 to pre-store a certain number of test piece templates, which can improve the recognition efficiency of circular holes.

[0048] In some embodiments, the hole spacing measurement system 100 further includes a measurement result output unit 180. The measurement result output unit 180 may be a module of the central control unit. The measurement result output unit 180 is communicatively connected to the image processing unit 170 to receive the measurement result output by the image processing unit 170. In some embodiments, the measurement result output unit 180 returns the measurement result and the coordinates of the straight line to the industrial vision system in the form of a JSON string. The system annotates the part drawing according to the detected circular hole center coordinates and radius returned by the measurement result output unit 180, and displays the measurement result.

[0049] In some embodiments, the hole spacing measurement system 100 further includes a control interface 190. The control interface 190 can be connected to the central control unit for communication. The control interface 190 includes a measurement result display area 191, and the control interface 190 is connected to the measurement result output unit 180 for communication, and is used to receive the measurement result output by the measurement result output unit 180 and display it in the measurement result display area 191. In some embodiments, the control interface 190 further includes a measurement process display area 192 and a system control area 193, the measurement process display area 192 allows the user to monitor the measurement process in real time, and the system control area 193 allows the user to control the operation of the system and save the measurement data for subsequent analysis.

[0050] In some embodiments, the first clamping member 124 includes a support plate 1241, an upper clamping plate 1242, a lower clamping plate 1243, a screw 1244 and an adjusting screw 1245. The support plate 1241 is vertically arranged on the base plate 110, the upper clamping plate 1242 is fixedly arranged on the side wall of the support plate 1241 and is in a horizontal state, and the lower clamping plate 1243 is slidably arranged on the side wall of the support plate 1241 and is in a horizontal state; the lower clamping plate 1243 is located below the upper clamping plate 1242, and there is a clamping space between the upper clamping plate 1242 and the lower clamping plate 1243. When the test piece needs to be clamped, the test piece is placed in the clamping space; the upper clamping plate Threaded holes cooperating with the screw 1244 are provided on 1242 and the lower clamping plate 1243. The screw 1244 passes through the threaded holes on the upper clamping plate 1242 and the lower clamping plate 1243. The adjusting screw 1245 cooperates with the screw 1244. By adjusting the position of the adjusting screw 1245 on the screw 1244, the height of the lower clamping plate 1243 can be adjusted, thereby changing the height of the clamping space, so that the first clamping member 124 can adapt to the test pieces of different thicknesses.

[0051] The structure of the first clamping member 124 is the same as that of the first clamping member 124 , and will not be repeated here.

[0052] In some embodiments, the first fixing mechanism 121 further includes a slider 1211, the support plate 1241 is fixed on the slider 1211, and a slide groove 111 cooperating with the slider 1211 is provided on the substrate 110. By driving the slider 1211 to slide in the slide groove 111, the entire first fixing mechanism 121 can be moved along the slide groove 111 relative to the substrate 110. Similarly, the second fixing mechanism 123 also includes a slider 1211, and the slider 1211 of the second fixing mechanism 123 can also move along the slide groove 111 relative to the substrate 110. By driving the first fixing mechanism 121 and the second fixing mechanism 123 to move along the slide groove 111, the distance between the first fixing mechanism 121 and the second fixing mechanism 123 can be changed, so that the DUT fixing mechanism 120 can clamp DUTs of different lengths.

[0053] In some embodiments, the slide groove 111 penetrates the substrate 110 along the length direction. In this way, while ensuring that the DUT fixing mechanism 120 can adapt to the DUT length range, it is convenient to install the DUT fixing mechanism 120 on the substrate 110.

[0054] In some embodiments, in order to realize the function of automatic adjustment, the hole spacing measurement system 100 further includes a first driving mechanism 211 and a second driving mechanism 212. The first driving mechanism 211 is connected to the slider 1211 of the first fixing mechanism 121, and is used to drive the slider 1211 of the first fixing mechanism 121 to move along the slide groove 111. The second driving mechanism 212 is connected to the slider 1211 of the second fixing mechanism 123, and is used to drive the slider 1211 of the second fixing mechanism 123 to move along the slide groove 111. The first driving mechanism 211 and the second driving mechanism 212 can be connected to the central control unit for communication, and the user can input control information through the aforementioned control interface 190. After receiving the control information, the first driving mechanism 211 and the second driving mechanism 212 respectively drive the first fixing mechanism 121 and the second fixing mechanism 123 to move a preset distance.

[0055] In some embodiments, the first driving mechanism 211 includes a screw rod 2111 parallel to the slide slot 111, and the slider 1211 of the first fixing mechanism 121 is sleeved on the screw rod 2111 through an internal thread; the first driving mechanism 211 also includes a motor 2112 driving the screw rod 2111 to rotate, and a speed change assembly 2113 connecting the motor 2112 and the screw rod 2111. The first driving mechanism 211 has the same structure as the second driving mechanism 212, which will not be described in detail here.

Claims

1. A hole spacing measurement system, characterized in that: include substrate, The device for fixing the test piece comprises a first fixing mechanism and a second fixing mechanism, wherein the first fixing mechanism and the second fixing mechanism are symmetrical in structure, the first fixing mechanism comprises a first clamping member capable of clamping the test piece, the second fixing mechanism comprises a second clamping member capable of clamping the test piece, the first clamping member and the second clamping member are respectively used to clamp two ends of the test piece, The first fixing mechanism and the second fixing mechanism are arranged on the substrate, and their positions on the substrate are adjustable. The image acquisition device fixing mechanism comprises a support frame, wherein the support frame comprises a first leg and a second leg arranged on the substrate, and further comprises a crossbeam connecting the first leg and the second leg, wherein an illumination light source and an image acquisition device are fixed on the crossbeam, The illumination light source and the image acquisition device are located above the fixture of the test piece. A template matching unit, wherein a plurality of test piece templates are stored in the template matching unit, and the template matching unit is communicatively connected to the image acquisition device, and is used to receive image information acquired by the image acquisition device, and match the image information with the test piece template, so as to determine the real area of ​​the test piece, An image processing unit is communicatively connected to the template matching unit, and is used to receive the real area of ​​the test piece matched by the template matching unit, and extract the coordinate information of the holes in the real area of ​​the test piece, and then calculate the distance between the holes.

2. The hole spacing measurement system according to claim 1, characterized in that: Also includes A measurement result output unit is communicatively connected to the image processing unit and is used to receive the measurement result output by the image processing unit.

3. The hole spacing measurement system according to claim 2, characterized in that: Also includes A control interface, wherein the control interface includes a measurement result display area, and the control interface is communicatively connected to the measurement result output unit, and is used to receive the measurement result output by the measurement result output unit and display it in the measurement result display area.

4. The hole spacing measurement system according to claim 1, characterized in that: The first clamping member includes a support plate, an upper clamping plate, a lower clamping plate, a screw and an adjusting screw. The support plate is vertically arranged on the base plate, The upper clamping plate is fixedly arranged on the side wall of the support plate and is in a horizontal state. The lower clamping plate is slidably disposed on the side wall of the support plate and is in a horizontal state. The lower clamping plate is located below the upper clamping plate. The upper clamping plate and the lower clamping plate are provided with threaded holes matched with the screw rods. The screw rod passes through the threaded holes on the upper clamping plate and the lower clamping plate, The adjusting screw cooperates with the screw rod, and the height of the lower clamping plate can be adjusted by adjusting the position of the adjusting screw on the screw rod.

5. The hole spacing measurement system according to claim 4, characterized in that: The first fixing mechanism further includes a slider, and the support plate is fixed on the slider. A sliding groove matched with the sliding block is arranged on the base plate.

6. The hole spacing measurement system according to claim 5, characterized in that: The slide groove penetrates the base plate along the length direction.

7. The hole spacing measurement system according to claim 6, characterized in that: Also includes a first drive mechanism and a second drive mechanism, The first driving mechanism is connected to the slider of the first fixing mechanism and is used to drive the slider of the first fixing mechanism to move along the sliding groove. The second driving mechanism is connected to the slider of the second fixing mechanism, and is used to drive the slider of the second fixing mechanism to move along the sliding groove.

8. The hole spacing measurement system according to claim 7, characterized in that: The first driving mechanism has the same structure as the second driving mechanism. The first driving mechanism includes a screw rod parallel to the slide groove, and the slider of the first fixing mechanism is sleeved on the screw rod through an internal thread; the first driving mechanism also includes a motor driving the screw rod to rotate, and a speed change assembly connecting the motor and the screw rod.

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