Device for detecting meshes of large-breadth screen

Abstract

The utility model provides a large-breadth screen mesh detection device. The large-breadth screen mesh detection device comprises a screen mesh placement platform, a three-axis moving platform, a telecentric light source module and a camera module, the screen placing platform comprises a bracket and optical glass, and a platform surface formed by the optical glass is used for placing a screen; the three-axis moving platform is integrally installed based on a support and comprises a first moving platform body moving relative to the x axis of the screen containing platform, a second moving platform body moving along the y axis based on the first moving platform body and a third moving platform body moving along the y axis based on the first moving platform body. The second moving platform is located below the optical glass, and the telecentric light source module is installed at the moving end of the second moving platform; the third moving platform is located above the optical glass, and the camera module is installed at the moving end of the third moving platform; and light paths of the camera module and the telecentric light source module are always concentrically arranged. The large-breadth device for detecting the meshes of the screen has the advantages of being excellent in detection performance, high in efficiency and smaller in size.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to a device for detecting mesh openings of a large-area screen. Background Art

[0002] As a precision screening tool, screens play a vital role in modern industry and scientific research. Screen mesh size directly impacts screening efficiency and product quality. By testing screen mesh size, we can ensure that the screens are manufactured to established standards, thereby ensuring that the screened materials meet the requirements of specific industries.

[0003] Since the screen is a three-dimensional structure, high-precision inspection of its mesh requires the use of a telecentric lens combined with a telecentric light source to eliminate perspective effects and reduce image distortion. However, due to the limitations of the field of view and volume of the inspection equipment, this method makes it difficult to inspect large areas of the screen mesh.

[0004] Patent number CN115018802A discloses a comprehensive detection device, which can theoretically meet the large-scale detection of screen mesh. However, in practice, the movement of its mobile platform may cause relative displacement between the screen and the mobile platform, affecting the detection accuracy; and if the screen mesh is to be fully detected, a large detection space needs to be reserved between the center of the mobile platform and the equipment bracket, which increases the size of the equipment.

[0005] In order to increase the screen detection area while ensuring that the equipment volume does not increase excessively and has high accuracy and efficiency, people have been looking for an ideal technical solution. Utility Model Content

[0006] The purpose of the utility model is to address the deficiencies of the prior art and thus provide a device for detecting large-area meshes of a sieve with excellent detection performance, high efficiency and smaller volume.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a device for detecting mesh openings of a large-area screen, comprising a screen placement platform, a three-axis moving platform, a telecentric light source module and a camera module;

[0008] The screen placement platform includes a bracket and an optical glass mounted on the bracket, and the platform table formed by the optical glass is used to place the screen;

[0009] The three-axis mobile platform is installed as a whole based on the bracket, and the three-axis mobile platform includes a first mobile platform that moves along the x-axis relative to the screen placement platform, a second mobile platform that moves along the y-axis based on the first mobile platform, and a third mobile platform that moves along the y-axis based on the first mobile platform;

[0010] The second mobile platform is located below the optical glass, and the telecentric light source module is installed on the mobile end of the second mobile platform;

[0011] The third mobile platform is located above the optical glass, and the camera module is installed on the mobile end of the third mobile platform;

[0012] The second movable platform and the third movable platform move synchronously, and the optical paths of the camera module and the telecentric light source module are always concentrically arranged.

[0013] Based on the above, the first mobile platform includes a screw drive module or a linear motor module installed based on the bracket, the driving part of the first mobile platform is installed at the center position of the bracket, and the guide rail structure of the first mobile platform is installed at both ends of the bracket.

[0014] Based on the above, the moving part of the first mobile platform includes two movable vertical boards, the second mobile platform and the third mobile platform are respectively installed at the bottom and top ends of the two movable vertical boards, and the two movable vertical boards, the second mobile platform and the third mobile platform form a stable frame structure as a whole. The driving part of the first mobile platform drives the two movable vertical boards to drive the stable frame structure to move along the guide rail structure of the first mobile platform.

[0015] Based on the above, the second mobile platform includes a screw drive module or a linear motor module installed on the bottom ends of the two movable vertical plates, and the telecentric light source module is installed on the mobile end of the second mobile platform.

[0016] Based on the above, the third mobile platform includes a screw drive module or a linear motor module installed on the top of two movable vertical plates, and the camera module is installed on the mobile end of the third mobile platform.

[0017] Based on the above, the bracket includes a first support plate, a second support plate and a fixed frame, the first support plate and the second support plate are parallel, the fixed frame is installed across the top of the first support plate and the second support plate, the guide rail structure and the driving part of the first movable platform are installed across the first support plate and the second support plate, and the optical glass is installed in the fixed frame.

[0018] Based on the above, the movable vertical plate is a triangular plate with a wide bottom end and a narrow top end. The inner side of the bottom end of the movable vertical plate is installed on the guide rail structure of the first movable platform through two sliding sleeves.

[0019] Based on the above, the first moving platform, the second moving platform and the third moving platform are screw drive modules of the same specifications.

[0020] Based on the above, the driving motors of the second mobile platform and the third mobile platform are controlled by the controller to start and close synchronously.

[0021] Based on the above, the lens that comes with the camera module is a telecentric lens.

[0022] Compared with the existing technology, the present invention has substantial characteristics and progress. Specifically, the present invention provides a feasible structural basis for the combined use of a telecentric camera, a telecentric lens and a telecentric light source, and realizes their efficient, stable and accurate synchronous movement and detection through the designed three-axis mobile platform. During the process, the screen does not need to be moved. Through the movement of the three-axis platform, the screen mesh can be fully and automatically detected on a large scale, with high detection efficiency. Compared with other detection equipment with the same capabilities, the structural design of the present invention is more compact and small, occupies less space, and is less difficult to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of a device for detecting mesh openings of a large-area screen in the present invention.

[0024] Figure 2 It is a cross-sectional view of a device for detecting mesh openings of a large-area screen in the utility model.

[0025] In the figure: 1. Screen placement platform; 2. Three-axis mobile platform; 3. Camera module; 4. Telecentric light source module; 5. Light source drive assembly; 101. First support plate; 102. Second support plate; 103. Fixed frame; 104. Optical glass; 21. First mobile platform; 22. Second mobile platform; 23. Third mobile platform; 24. Movable vertical plate; 31. Area array industrial camera; 32. Telecentric lens; 33. Mounting parts; 51. Screw drive module; 52. Moving seat. DETAILED DESCRIPTION

[0026] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0027] like Figure 1 and Figure 2 As shown, a device for detecting large-scale mesh of a screen includes a screen placement platform 1, a three-axis moving platform 2, a telecentric light source module 3 and a camera module 4, wherein the lens in the camera module is a telecentric lens.

[0028] The screen placement platform 1 includes a bracket and an optical glass 104 mounted on the bracket. The platform surface formed by the optical glass 104 is used for placing the screen.

[0029] In this embodiment, the bracket includes a first support plate 101, a second support plate 102 and a fixed frame 103. The first support plate 101 and the second support plate 102 are parallel. The fixed frame 103 is installed across the top of the first support plate 101 and the second support plate 102. The guide rail and the driving part of the first movable platform are installed across the first support plate 101 and the second support plate 102. The optical glass 104 is installed in the fixed frame 103.

[0030] The three-axis mobile platform 2 is installed as a whole based on the bracket, and the three-axis mobile platform 2 includes a first mobile platform 21 that moves along the x-axis relative to the screen placement platform, a second mobile platform 22 that moves along the y-axis based on the first mobile platform, and a third mobile platform 23 that moves along the y-axis based on the first mobile platform.

[0031] The first mobile platform 21 includes a screw drive module or a linear motor module mounted on a bracket, the drive portion of the first mobile platform is mounted at the center of the bracket, and the guide rail structure of the first mobile platform is mounted at both ends of the bracket.

[0032] The moving part of the first mobile platform includes two movable vertical boards 24, and the second mobile platform 22 and the third mobile platform 23 are respectively installed at the bottom and top ends of the two movable vertical boards 24. The two movable vertical boards 24, the second mobile platform 22 and the third mobile platform 23 form a stable frame structure as a whole. The driving part of the first mobile platform 21 drives the two movable vertical boards 24 to drive the stable frame structure to move along the guide rail structure of the first mobile platform.

[0033] In this embodiment, the first movable platform 21, the second movable platform 22 and the third movable platform 23 are screw drive modules of the same specifications. The nut structure driven by the screw in the first movable platform 21 is connected to the cross bar spanning the bottom ends of the two movable vertical plates 24, thereby achieving the purpose of driving the two movable vertical plates 24 to move.

[0034] The second movable platform 22 includes a screw drive module or a linear motor module installed on the bottom end of two movable vertical plates 24. The telecentric light source module 3 is installed at the movable end of the second movable platform 22. The second movable platform 22 is located below the optical glass 104. The telecentric light source module 3 is driven by the light source drive assembly 5, and the light source drive assembly 5 is also installed at the movable end of the second movable platform 22.

[0035] The third mobile platform 23 includes a screw drive module or a linear motor module installed on the top of two movable vertical plates 24. The camera module 4 is installed on the mobile end of the third mobile platform 23. The third mobile platform 23 is located above the optical glass 104. Specifically, the camera module 4 includes an area array industrial camera 31, a telecentric lens 32 and a mounting part 33. The area array industrial camera 31 and the telecentric lens 32 are installed on the mobile end of the third mobile platform 23 through the mounting part 33.

[0036] The driving motors of the second movable platform 22 and the third movable platform 23 are controlled by the controller to open and close synchronously, and the second movable platform 22 and the third movable platform 23 move synchronously. The optical paths of the camera module 4 and the telecentric light source module 3 are always concentrically arranged.

[0037] Working principle description:

[0038] When performing mesh detection on the screen, the camera module 4 first moves in the Y-axis direction at the initial position, and the amplitude of each movement is controlled to be the width of the picture taken by the camera module. After each movement, a picture of the screen is taken. The camera module 4 moves from one side of the Y-axis of the third mobile platform to the other side, and then moves in the X-axis direction, and the amplitude of each movement is controlled to be the width of the picture taken by the camera module. The above actions are repeated to complete the image acquisition of the screen; the telecentric light source always remains concentric with the telecentric lens during the movement of the camera module.

[0039] The image captured by the camera module is transmitted to the computer to synthesize the complete image of the screen. Figure 1 Complete the entire screen mesh inspection at one time.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A device for detecting large-area mesh openings of a screen, characterized by: Including screen placement platform, three-axis moving platform, telecentric light source module and camera module; The screen placement platform includes a bracket and an optical glass mounted on the bracket, and the platform table formed by the optical glass is used to place the screen; The three-axis mobile platform is installed as a whole based on the bracket, and the three-axis mobile platform includes a first mobile platform that moves along the x-axis relative to the screen placement platform, a second mobile platform that moves along the y-axis based on the first mobile platform, and a third mobile platform that moves along the y-axis based on the first mobile platform; The second mobile platform is located below the optical glass, and the telecentric light source module is installed on the mobile end of the second mobile platform; The third mobile platform is located above the optical glass, and the camera module is installed on the mobile end of the third mobile platform; The second movable platform and the third movable platform move synchronously, and the optical paths of the camera module and the telecentric light source module are always concentrically arranged.

2. The device for detecting large-area mesh size according to claim 1, characterized in that: The first mobile platform includes a screw drive module or a linear motor module installed based on the bracket. The driving part of the first mobile platform is installed at the center position of the bracket, and the guide rail structure of the first mobile platform is installed at both ends of the bracket.

3. The device for detecting large-area mesh size according to claim 2, characterized in that: The moving part of the first mobile platform includes two movable vertical boards, and the second mobile platform and the third mobile platform are respectively installed at the bottom and top ends of the two movable vertical boards. The two movable vertical boards, the second mobile platform and the third mobile platform form a stable frame structure as a whole. The driving part of the first mobile platform drives the two movable vertical boards to drive the stable frame structure to move along the guide rail structure of the first mobile platform.

4. The device for detecting large-area mesh size according to claim 3, characterized in that: The second mobile platform includes a screw drive module or a linear motor module installed on the bottom ends of two movable vertical plates, and the telecentric light source module is installed on the mobile end of the second mobile platform.

5. The device for detecting large-area mesh size according to claim 3 or 4, characterized in that: The third mobile platform includes a screw drive module or a linear motor module installed on the top of two movable vertical plates, and the camera module is installed on the mobile end of the third mobile platform.

6. The device for detecting large-area mesh size according to claim 1, 2, 3 or 4, characterized in that: The bracket includes a first support plate, a second support plate and a fixed frame, the first support plate and the second support plate are parallel, the fixed frame is installed across the top of the first support plate and the second support plate, the guide rail structure and the driving part of the first movable platform are installed across between the first support plate and the second support plate, and the optical glass is installed in the fixed frame.

7. The device for detecting large-area mesh size according to claim 3, characterized in that: The movable vertical plate is a triangular plate with a wide bottom end and a narrow top end. The inner side of the bottom end of the movable vertical plate is installed on the guide rail structure of the first movable platform through two sliding sleeves.

8. The device for detecting large-area mesh size according to claim 6, characterized in that: The first moving platform, the second moving platform and the third moving platform are screw drive modules of the same specifications.

9. The device for detecting large-area mesh size according to claim 8, characterized in that: The driving motors of the second mobile platform and the third mobile platform are controlled by a controller to open and close synchronously.

10. The device for detecting large-area mesh size according to claim 1, characterized in that: The lens matched with the camera module is a telecentric lens.

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