Product dimension and form and location tolerance detection device and detection method thereof

Abstract

The invention relates to the technical field of detection equipment, and provides a product size and form and location tolerance detection device and a detection method thereof.The product size and form and location tolerance detection device comprises a collection structure, the collection structure comprises three sets of collection mechanisms and backlight sources, and the collection mechanisms are used for collecting product corner features; the three sets of collection mechanisms comprise a first collection assembly, a second collection assembly and a third collection assembly, the first collection assembly, the second collection assembly and the third collection assembly are longitudinally distributed, the backlight source and the second collection assembly are oppositely arranged, and during collection, a product is located between the second collection assembly and the backlight source in the horizontal direction; the vertical direction is located between the first collection assembly and the second collection assembly. On the basis, the structure is simple, the occupied space is small, and the detection precision and efficiency are better guaranteed.

Description

Technical Field

[0001] The present application relates to the field of detection equipment, and particularly to a product size and geometric tolerance detection device and its detection method. Background Art

[0002] In existing industrial production, the size detection and geometric tolerance detection of products are key links in quality control. However, traditional detection methods usually require dispersing these two detection functions to multiple different workstations for operation, making the equipment complex, costly, occupying a large space, and the detection accuracy of manual operation being affected by operators and the efficiency being slow.

[0003] Therefore, the present application studies a product size and geometric tolerance detection device, which has a simple structure, occupies a small space, and better ensures detection accuracy and efficiency. Summary of the Invention

[0004] In order to have a simple structure, occupy a small space, and better ensure detection accuracy and efficiency, the present application provides a product size and geometric tolerance detection device.

[0005] A product size and geometric tolerance detection device and its detection method provided by the present application adopt the following technical solutions:

[0006] A product size and geometric tolerance detection device includes an acquisition structure. The acquisition structure includes three groups of acquisition mechanisms and a backlight. The acquisition mechanisms are used to acquire the corner features of the product. The three groups of acquisition mechanisms include a first acquisition component, a second acquisition component, and a third acquisition component. The first acquisition component, the second acquisition component, and the third acquisition component are longitudinally distributed. The backlight is disposed opposite to the second acquisition component. During acquisition, the product is horizontally located between the second acquisition component and the backlight, and vertically located between the first acquisition component and the second acquisition component.

[0007] By adopting the above technical solutions, after the acquisition mechanisms acquire the corner features of the product, they upload them to the control system for processing to obtain the product size and geometric tolerance. The product size detection and geometric tolerance detection functions are integrated in the same device. Through the collaborative work of the three groups of acquisition mechanisms and the backlight, a comprehensive acquisition of the corner features of the product is achieved. The product has a simple structure, enabling detection to be realized in a small space, and better ensuring detection accuracy and efficiency through intelligent acquisition.

[0008] Optionally, the first acquisition component includes a first camera, a first lens, and a first corner coaxial light source connected in sequence; the second acquisition component includes a second camera and a second lens connected in sequence; the third acquisition component includes a third camera, a third lens, and a third corner coaxial light source connected in sequence; the first corner coaxial light source and the third corner coaxial light source are arranged facing each other; the second lens faces the backlight source and is coaxially centered; the product is placed between the second lens and the backlight source and between the first corner coaxial light source and the third corner coaxial light source.

[0009] By adopting the above technical solution, a first corner coaxial light source and a third corner coaxial light source are respectively equipped and arranged facing each other. This design enables the device to perform symmetric detection from both sides of the product, especially suitable for precise measurement of the product's corner features. By directly facing the backlight source with the second lens and coaxially centering it with the backlight source, the features of the product in the horizontal direction can be clearly captured, which not only improves the detection accuracy but also effectively utilizes the uniform light provided by the backlight source to further enhance the quality of the detection image, and can make full use of the space to ensure the detection efficiency.

[0010] Optionally, it further includes a lens mounting plate. The lens mounting plate is provided with three lens holes, and the centers of the lens holes are located on the same vertical line. The first lens and the third lens are sequentially mounted in the upper and lower two lens holes, and the second lens moves in the middle lens hole.

[0011] By adopting the above technical solution, the position deviation between the lenses is reduced, thereby improving the alignment accuracy and consistency of the detection images.

[0012] Optionally, it further includes an upper mounting plate and a lower mounting plate connected to both ends of the lens mounting plate. The first corner coaxial light source is mounted on one side of the upper mounting plate facing the lower mounting plate, and the third corner coaxial light source is mounted on one side of the lower mounting plate facing the upper mounting plate.

[0013] Optionally, a front mounting plate is connected to one side of the upper mounting plate, and the backlight source is mounted on the front mounting plate.

[0014] Optionally, a camera mounting plate is further arranged between the upper mounting plate and the lower mounting plate. The camera mounting plate is provided with two camera mounting holes and a relief groove. The relief groove is located between the two camera mounting holes. The first camera and the third camera are respectively mounted in the two camera mounting holes, and the second acquisition component moves between the relief groove and the lens hole.

[0015] Optionally, the acquisition mechanism further includes a first adjustment mechanism for adjusting the position of the second acquisition component.

[0016] Optionally, it further includes a second adjustment mechanism for adjusting the position of the acquisition structure.

[0017] A method for detecting product size and geometric tolerance uses the product size and geometric tolerance detection device as described above, and includes the following steps:

[0018] S1. Use a checkerboard calibration board to unify the coordinate systems of the first camera and the third camera.

[0019] S2. Place the product on a transparent turntable. The first camera and the third camera respectively collect the upper surface and the lower surface of the product through the first angular coaxial light source and the third angular coaxial light source, and the second camera collects the thickness of the product, thereby collecting the corner features of the product.

[0020] S3. The first camera, the second camera, and the third camera transmit the collected corner features to the control system for processing and analysis to obtain the size and geometric tolerance of the product.

[0021] S4. The control system automatically judges the size and geometric tolerance obtained for the product to determine whether the product is a qualified product.

[0022] Optionally, step S3 includes the following steps:

[0023] S31. The first camera finds the four corner point coordinates of the upper surface of the product, denoted as P11, P12, P13, and P14 respectively; the third camera finds the four corner point coordinates of the lower surface of the product, denoted as P21, P22, P23, and P24 respectively.

[0024] S32. According to the straight-line slope formula k = (y2 - y1) / (x2 - x1), the slopes of the four sides of the upper surface and the four sides of the lower surface of the product can be respectively obtained. The slopes of the four sides of the upper surface of the product are respectively denoted as k11, k12, k13, and k14, and the slopes of the four sides of the lower surface of the product are respectively denoted as k21, k22, k23, and k24.

[0025] S33. According to the formula the included angles between the four sides of the upper surface and the four sides of the lower surface of the product can be obtained. The included angles between the four sides of the upper surface of the product are respectively denoted as θ11, θ12, θ13, and θ14, and the included angles between the four sides of the lower surface of the product are respectively denoted as θ21, θ22, θ23, and θ24.

[0026] S34. According to the distance formula between two points the distances between points P11 and P21 on the upper and lower surfaces of the product, the distance between points P12 and P22, the distance between points P13 and P23, and the distance between points P14 and P24, denoted as D1, D2, D3, and D4 respectively, can be obtained.

[0027] S35. The included angle between the upper and lower surfaces and the side surface can be calculated according to the following formula:

[0028] θ = arcsin(D / H)

[0029] where H is the thickness of the product.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. After the acquisition mechanism acquires the corner features of the product and uploads them to the control system for processing to obtain the product dimensions and geometric tolerances, the product dimension detection and geometric tolerance detection functions are integrated in the same device. Through the coordinated work of three groups of acquisition mechanisms and the backlight, the comprehensive acquisition of the corner features of the product is realized. The product has a simple structure, enabling detection in a small space, and the intelligent acquisition better ensures the detection accuracy and efficiency;

[0032] 2. The first turning coaxial light source and the third turning coaxial light source are respectively equipped and arranged facing each other. This design enables the device to perform symmetric detection from both sides of the product, which is particularly suitable for the precise measurement of the corner features of the product. By directly facing the backlight with the second lens and setting it coaxially with the center of the backlight, the features of the product in the horizontal direction can be clearly captured, not only improving the detection accuracy, but also effectively utilizing the uniform light provided by the backlight to further improve the quality of the detection image, and being able to make full use of the space to ensure the detection efficiency;

[0033] 3. Reduce the position deviation between the lenses, thereby improving the alignment accuracy and consistency of the detection images. Brief Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the product dimension and geometric tolerance detection device according to the embodiment of the present application;

[0035] Figure 2 is a schematic structural diagram of the product dimension and geometric tolerance detection device from another perspective according to the embodiment of the present application;

[0036] Figure 3 is a schematic structural diagram showing the first adjustment mechanism in the product dimension and geometric tolerance detection device according to the embodiment of the present application;

[0037] Figure 4 is a schematic diagram of the acquisition principle of the first camera and the third camera in the product dimension and geometric tolerance detection method according to the embodiment of the present application;

[0038] Figure 5 is a schematic diagram of the corner point coordinates of the upper and lower surfaces of the product in the product dimension and geometric tolerance detection method according to the embodiment of the present application.

[0039] Reference numerals: 1, acquisition structure; 2, backlight; 3, first acquisition component; 31, first camera; 32, first lens; 33, first corner coaxial light source; 4, second acquisition component; 41, second camera; 42, second lens; 5, third acquisition component; 51, third camera; 52, third lens; 53, third corner coaxial light source; 6, lens mounting plate; 7, lens hole; 8, upper mounting plate; 9, lower mounting plate; 10, front mounting plate; 11, camera mounting plate; 12, camera mounting hole; 13, relief groove; 14, moving plate; 15, second adjustment mechanism; 16, back plate; 17, guide rail; 18, driving member. Detailed implementation manners

[0040] The following further describes this application in detail Figures 1-3 in conjunction with the accompanying drawings.

[0041] An embodiment of this application discloses a product size and geometric tolerance detection device. Referring to Figure 1 and Figure 2 , the product size and geometric tolerance detection device includes an acquisition structure 1, and the acquisition structure 1 includes three groups of acquisition mechanisms and a backlight 2. The acquisition mechanisms are used to acquire the corner features of the product. The three groups of acquisition mechanisms include a first acquisition component 3, a second acquisition component 4, and a third acquisition component 5. The first acquisition component 3, the second acquisition component 4, and the third acquisition component 5 are longitudinally distributed, so that the space can be better utilized, the structure is simple and compact, and the occupied space is small. The backlight 2 is disposed opposite to the second acquisition component 4, so that a better light source can be provided, and the acquired data is more accurate. During acquisition, the product is horizontally located between the second acquisition component 4 and the backlight 2, and vertically located between the first acquisition component 3 and the second acquisition component 4, so that the corner features of the product can be acquired in all directions, and thus the product size and geometric tolerance data can be obtained more accurately through the system.

[0042] In some embodiments, the first acquisition component 3 includes a first camera 31, a first lens 32, and a first corner coaxial light source 33 connected in sequence. The first corner coaxial light source 33 is internally provided with a first prism; the second acquisition component 4 includes a second camera 41 and a second lens 42 connected in sequence, and the third acquisition component 5 includes a third camera 51, a third lens 52, and a third corner coaxial light source 53 connected in sequence. The third corner coaxial light source 53 is internally provided with a third prism. The first corner coaxial light source 33 and the third corner coaxial light source 53 are arranged facing each other; the second lens 42 faces the backlight 2 and is coaxially arranged at the center, so that the features of the product in the horizontal direction can be clearly captured, which not only improves the detection accuracy, but also can effectively utilize the uniform light provided by the backlight 2; the product is placed between the second lens 42 and the backlight 2 and is located between the first corner coaxial light source 33 and the third corner coaxial light source 53, and the corner features of the product can be obtained in all directions, thereby improving the accuracy.

[0043] Continuing to refer to Figure 1 , in some embodiments, the product size and geometric tolerance detection device further includes a lens mounting plate 6. The lens mounting plate 6 is provided with three lens holes 7, and the centers of the lens holes 7 are located on the same vertical line. The first lens 32 and the third lens 52 are sequentially mounted in the upper and lower two lens holes 7 to reduce the positional deviation between the lenses, and the second lens 42 moves within the middle lens hole 7.

[0044] In some embodiments, the product size and geometric tolerance detection device further includes an upper mounting plate 8 and a lower mounting plate 9 connected to both ends of the lens mounting plate 6. The first angular coaxial light source 33 is screwed and mounted on one side of the upper mounting plate 8 facing the lower mounting plate 9, and the third angular coaxial light source 53 is screwed and mounted on one side of the lower mounting plate 9 facing the upper mounting plate 8. In some embodiments, a front mounting plate 10 is bolted to one side of the upper mounting plate 8, and the backlight 2 is mounted on the front mounting plate 10.

[0045] In some embodiments, a camera mounting plate 11 is also screwed between the upper mounting plate 8 and the lower mounting plate 9. The camera mounting plate 11 is provided with two camera mounting holes 12 and a relief groove 13. The relief groove 13 is located between the two camera mounting holes 12. The first camera 31 and the third camera 51 are respectively mounted in the two camera mounting holes 12, and the second acquisition component 4 moves between the relief groove 13 and the lens hole 7, so that the position of the second acquisition component 4 can be adjusted according to the actual product, so as to collect product information more accurately.

[0046] Referring to Figure 3 , in some embodiments, the acquisition mechanism further includes a first adjustment mechanism for adjusting the position of the second acquisition component 4. In this embodiment, a back plate 16 is also screwed between the upper mounting plate 8 and the lower mounting plate 9. The first adjustment mechanism includes a moving plate 14, a guide rail 17 and a driving member 18. The second acquisition component 4 is mounted on the moving plate 14. The guide rail 17 is mounted on the back plate 16. The moving plate 14 cooperates with the guide rail 17. The driving member 18 can be a cylinder. In this embodiment, the driving member 18 realizes fine adjustment by means of gear rotation meshing, and a scale is provided on the guide rail 17, which can be adjusted more precisely. The driving member 18 drives the moving plate 14 to drive the second acquisition component 4 to move along the guide rail.

[0047] Referring again to Figure 1 , in some embodiments, the product size and geometric tolerance detection device further includes a second adjustment mechanism 15, which can be a linear module. The second adjustment mechanism 15 is used to adjust the position of the acquisition structure 1. The position of the acquisition structure 1 can be adjusted through the second adjustment mechanism 15 to better suit different products.

[0048] Referring to Figures 1 to 5, the present invention also discloses a method for detecting product dimensions and geometric tolerances, which uses the described product dimension and geometric tolerance detection device and includes the following steps:

[0049] S1. Use a checkerboard calibration plate to unify the coordinate systems of the first camera 31 and the third camera 51;

[0050] S2. Place the product on a transparent turntable, where the turntable is a glass turntable. The first camera 31 and the third camera 51 respectively collect the upper surface and the lower surface of the product through the first angular coaxial light source 33 and the third angular coaxial light source 53, and the second camera 41 collects the thickness of the product, thereby collecting the corner features of the product. It should be noted that the first angular coaxial light source 33 and the third angular coaxial light source 53 change the light path through the built-in prism, making the light form a specific angle with the camera optical axis, and finally making the light direction parallel to the camera line of sight;

[0051] S3. The first camera 31, the second camera 41, and the third camera 51 transmit the collected corner features to the control system for processing and analysis to obtain the dimensions and geometric tolerances of the product;

[0052] S4. The control system automatically judges the dimensions and geometric tolerances obtained for the product to determine whether the product is a qualified product.

[0053] Specifically, the step S3 includes the following steps:

[0054] S31. The first camera 31 finds the coordinates of the four corner points on the upper surface of the product, which are respectively denoted as P11, P12, P13, and P14; the third camera 51 finds the coordinates of the four corner points on the lower surface of the product, which are respectively denoted as P21, P22, P23, and P24;

[0055] S32. According to the straight-line slope formula k = (y2 - y1) / (x2 - x1), the slopes of the four sides on the upper surface and the four sides on the lower surface of the product can be respectively calculated. The slopes of the four sides on the upper surface of the product are respectively denoted as k11, k12, k13, and k14, and the slopes of the four sides on the lower surface of the product are respectively denoted as k21, k22, k23, and k24;

[0056] S33. According to the formula the included angles of the four sides on the upper surface and the four sides on the lower surface of the product can be calculated. The included angles of the four sides on the upper surface of the product are respectively denoted as θ11, θ12, θ13, and θ14, and the included angles of the four sides on the lower surface of the product are respectively denoted as θ21, θ22, θ23, and θ24;

[0057] S34. According to the distance formula between two points The distances D1 between points P11 and P21 on the upper and lower surfaces of the product, D2 between points P12 and P22, D3 between points P13 and P23, and D4 between points P14 and P24 can be obtained;

[0058] S35. The angle between the upper and lower surfaces and the side surface can be calculated according to the following formula:

[0059] θ = arcsin(D / H)

[0060] where H is the thickness of the product.

[0061] The implementation principle of a product size and geometric tolerance detection device according to an embodiment of the present application is as follows: The acquisition mechanism acquires the corner features of the product and uploads them to the control system for processing to obtain the product size and geometric tolerance. The product size detection and geometric tolerance detection functions are integrated in the same device. Through the collaborative work of three groups of acquisition mechanisms and the backlight 2, comprehensive acquisition of the corner features of the product is achieved. The product has a simple structure, enabling detection to be realized in a small space, and the detection accuracy and efficiency are better guaranteed through intelligent acquisition.

[0062] The above are all preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A product size and geometric tolerance detection device, characterized in that: It includes a collection structure, and the collection structure includes three groups of collection mechanisms and a backlight. The collection mechanisms are used to collect the corner features of the product. The three groups of collection mechanisms include a first collection component, a second collection component, and a third collection component. The first collection component, the second collection component, and the third collection component are longitudinally distributed. The backlight is disposed opposite to the second collection component. During collection, the product is horizontally located between the second collection component and the backlight, and vertically located between the first collection component and the second collection component.

2. The dimensional and geometric tolerance detection device for a product according to claim 1, characterized in that: The first collection component includes a first camera, a first lens, and a first corner coaxial light source connected in sequence; the second collection component includes a second camera and a second lens connected in sequence; the third collection component includes a third camera, a third lens, and a third corner coaxial light source connected in sequence; the first corner coaxial light source and the third corner coaxial light source are arranged facing each other; the second lens faces the backlight and is coaxially centered; the product is placed between the second lens and the backlight and is located between the first corner coaxial light source and the third corner coaxial light source.

3. The product size and geometric tolerance detection device according to claim 2, characterized in that: It further includes a lens mounting plate. The lens mounting plate is provided with three lens holes, and the centers of the lens holes are located on the same vertical line. The first lens and the third lens are sequentially mounted in the upper and lower two lens holes, and the second lens moves within the middle lens hole.

4. A product size and form and position tolerance detection device according to claim 3, characterized in that: It further includes an upper mounting plate and a lower mounting plate connected to both ends of the lens mounting plate. The first corner coaxial light source is mounted on one side of the upper mounting plate facing the lower mounting plate, and the third corner coaxial light source is mounted on one side of the lower mounting plate facing the upper mounting plate.

5. The dimensional and geometric tolerance inspection device for a product according to claim 4, characterized in that: One side of the upper mounting plate is connected with a front mounting plate, and the backlight is mounted on the front mounting plate.

6. The product size and geometric tolerance detection device according to claim 4, characterized in that: A camera mounting plate is further provided between the upper mounting plate and the lower mounting plate. The camera mounting plate is provided with two camera mounting holes and a relief groove. The relief groove is located between the two camera mounting holes. The first camera and the third camera are respectively mounted in the two camera mounting holes, and the second collection component moves between the relief groove and the lens holes.

7. A product size and geometric tolerance detection device according to claim 1, characterized in that: The collection mechanism further includes a first adjustment mechanism, and the first adjustment mechanism is used to adjust the position of the second collection component.

8. A product size and geometric tolerance detection device according to claim 1, characterized in that: It further includes a second adjustment mechanism, and the second adjustment mechanism is used to adjust the position of the collection structure.

9. A method for detecting the size and geometric tolerance of a product, which uses the product size and geometric tolerance detection device described in any one of claims 1-8, and is characterized in that: It includes the following steps: S1. Use a checkerboard calibration plate to unify the coordinate systems of the first camera and the third camera; S2. Place the product on a transparent turntable. The first camera and the third camera respectively collect the upper surface and the lower surface of the product through the first corner coaxial light source and the third corner coaxial light source, and the second camera collects the thickness of the product, so as to collect the corner features of the product; S3. The first camera, the second camera, and the third camera transmit the collected corner features to the control system for processing and analysis to obtain the dimensions and geometric tolerances of the product; S4. The control system automatically judges the dimensions and geometric tolerances obtained for the product to determine whether the product is a qualified product.

10. A method for detecting the size and geometric tolerance of a product as claimed in the claim, characterized in that: The step S3 includes the following steps: S31. The first camera finds the coordinates of the four corner points on the upper surface of the product, denoted as P11, P12, P13, and P14 respectively; the third camera finds the coordinates of the four corner points on the lower surface of the product, denoted as P21, P22, P23, and P24 respectively. S32. According to the straight-line slope formula k = (y2 - y1) / (x2 - x1), the slopes of the four sides on the upper surface and the four sides on the lower surface of the product can be calculated respectively. The slopes of the four sides on the upper surface of the product are denoted as k11, k12, k13, and k14 respectively, and the slopes of the four sides on the lower surface of the product are denoted as k21, k22, k23, and k24 respectively. S33. According to the formula the included angles between the four sides of the upper surface and the four sides of the lower surface of the product can be obtained. The included angles of the four sides of the upper surface of the product are respectively denoted as θ11, θ12, θ13, θ14, and the included angles of the four sides of the lower surface of the product are respectively denoted as θ21, θ22, θ23, θ24; S34. According to the distance formula between two points the distances D1 between points P11 and P21 on the upper and lower surfaces of the product, D2 between points P12 and P22, D3 between points P13 and P23, and D4 between points P14 and P24 can be obtained; S35. According to the following formula, the angles between the upper and lower surfaces and the side surfaces can be calculated: θ = arcsin(D / H) where H is the thickness of the product.

Images