Grid image projection device and detection method

Abstract

The invention relates to the technical field of automobile glass curvature detection, in particular to a grid image projection device and a detection method, and the device comprises a detection support, a grid projection screen and a first industrial camera. The detection support is provided with a detection platform, the grid projection screen is arranged on the detection support in a swinging mode, the grid projection screen can project grids towards the table top direction of the detection platform, the first industrial camera is arranged on the detection support, and a lens of the first industrial camera faces the table top of the detection platform. The detection precision can be ensured, and the glass is prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile glass curvature detection, and in particular to a grid image projection device and a detection method. Background Art

[0002] In the production process of automotive glass, in order to ensure its optical performance and the tightness between the car body and the automotive glass, the curvature of the glass needs to be tested before leaving the factory. The current mainstream curvature detection methods are probe detection method and laser scanner method. Among them, the probe detection method requires the use of the probe to contact more points on the glass to obtain complete curvature information, and the measurement speed is slow. In addition, if the operator is not skilled, the probe may scratch the glass; the laser scanner method, because different types of glass have different specifications, in addition to different curvatures, there are also different factors such as transmittance and reflectivity. Therefore, using the same detection tooling for testing may result in measurement failure or image distortion, inaccurate results, and other problems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a grid image projection device and a detection method, which can not only ensure the detection accuracy but also avoid damaging the glass.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a grid image projection device, including a detection bracket, a grid projection screen and a first industrial camera; the detection bracket has a detection platform, the grid projection screen is swingably arranged on the detection bracket, the grid projection screen can project a grid toward the table top of the detection platform, the first industrial camera is arranged on the detection bracket, and the lens of the first industrial camera is facing the table top of the detection platform.

[0005] A detection method comprises the following steps:

[0006] Step S1, positioning the glass on the table of the detection platform;

[0007] Step S2, the grid projection screen projects a grid onto the glass surface on the detection platform;

[0008] Step S3, the first industrial camera acquires a grid image on the glass surface;

[0009] Step S4: obtaining the glass curvature according to the grid distortion on the obtained grid image.

[0010] The beneficial effects of the present invention are as follows: different from the prior art, a grid projection screen is used to project a grid onto the glass surface, thereby avoiding image distortion due to the transmittance and reflectivity of the glass, so as to ensure the quality of the grid image on the glass surface obtained by the first industrial camera. Since the projected grid will undergo a certain degree of distortion according to the curvature of the glass surface, the curvature of the glass can be calculated through the grid distortion on the grid image. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A diagram of a glass handling system of a grid image projection device proposed by the present invention;

[0012] Figure 2 A schematic diagram of the structure of a detection bracket of a grid image projection device proposed by the present invention;

[0013] Figure 3 A schematic diagram of the side view structure of a detection bracket of a grid image projection device proposed by the present invention;

[0014] Figure 4 A schematic diagram of the structure of a detection platform of a raster image projection device proposed by the present invention;

[0015] Figure 5 A schematic diagram of the structure of a positioning bracket of a grid image projection device proposed by the present invention;

[0016] Figure 6 A raster image obtained by a raster image projection device proposed by the present invention;

[0017] Description of labels:

[0018] 1. Detection bracket; 11. Detection platform; 111. Assembly hole;

[0019] 2. Grid projection screen; 3. First industrial camera; 4. Positioning support column;

[0020] 5. Positioning assembly; 51. Positioning bracket; 511. Positioning platform; 512. Second industrial camera; 52. First manipulator; 53. Conveyor belt; 54. Second manipulator;

[0021] 6. The third industrial camera. DETAILED DESCRIPTION

[0022] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0023] Please refer to Figure 1 , Figure 2 and Figure 6As shown, the present invention is a grid image projection device, comprising a detection bracket 1, a grid projection screen 2 and a first industrial camera 3; the detection bracket 1 has a detection platform 11, the grid projection screen 2 is swingably arranged on the detection bracket 1, the grid projection screen 2 can project a grid toward the table surface of the detection platform 11, the first industrial camera 3 is arranged on the detection bracket 1, and the lens of the first industrial camera 3 faces the table surface of the detection platform 11.

[0024] Working principle: A grid projection screen 2 is used to project a grid onto the glass surface to avoid image distortion due to the transmittance and reflectivity of the glass, so as to ensure the quality of the grid image on the glass surface obtained by the first industrial camera 3. Since the projected grid will be distorted to a certain extent according to the curvature of the glass surface, the curvature of the glass can be calculated through the grid distortion on the grid image.

[0025] Among them, taking the glass with a size of 750mm*700mm as an example, it is preferred to use a 100-inch grid projection screen 2 to project a grid with a spacing of 5mm.

[0026] Please refer to Figure 3 As shown, further, the projection surface of the grid projection screen 2 forms an angle A with the table surface of the detection platform 11. Preferably, A is 30°.

[0027] It can be seen from the above description that, without affecting the first industrial camera 3 from acquiring an image, it is ensured that the grid projection screen 2 can project a grid onto the glass surface.

[0028] Please refer to Figure 4 As shown, further, the above-mentioned grid image projection device also includes a positioning support column 4, and a plurality of assembly holes 111 for installing the positioning support column 4 are arranged on the table top of the detection platform 11.

[0029] It can be known from the above description that the assembly holes 111 can be used to install the positioning support column 4 according to the glass of different sizes and specifications, so that the positioning support column 4 can stably support the glass on the table of the detection platform 11.

[0030] Please refer to Figure 1 and Figure 5 As shown, further, the above-mentioned raster image projection device also includes a positioning component 5, the positioning component 5 includes a positioning bracket 51 and a first manipulator 52, the positioning bracket 51 has a positioning platform 511, a second industrial camera 512 is arranged on the positioning bracket 51, the lens of the second industrial camera 512 is facing the table top of the positioning platform 511, and the grabbing end of the first manipulator 52 moves back and forth between the positioning platform 511 and the detection platform 11.

[0031] From the above description, it can be seen that before the glass is placed on the detection platform 11, the glass is first placed on the positioning platform 511 and the position of the glass is determined by the second industrial camera 512, and then the glass is moved to the detection platform 11 by the first manipulator 52, thereby ensuring that the position of the glass on the detection platform 11 is accurate to improve the detection accuracy.

[0032] Please refer to Figure 1 As shown, the positioning assembly 5 also includes a conveyor belt 53 for receiving the discharge end of the drying and bending furnace, and a second manipulator 54, and the grabbing end of the second manipulator 54 moves back and forth between the conveyor belt 53 and the positioning platform 511.

[0033] From the above description, it can be known that the additional conveyor belt 53 can be connected with the production line to realize that after the glass is bent, it is transported by the conveyor belt 53 and then the second robot 54 grabs the glass and places it on the positioning platform 511 for positioning.

[0034] The table top of the positioning platform 511 is also provided with a plurality of assembly holes 111 , and the positioning support columns 4 are assembled on the assembly holes 111 according to the size specifications of the glass, so that the positioning support columns 4 can stably support the glass on the table top of the positioning platform 511 .

[0035] Please refer to Figure 1 As shown, in an optional embodiment, the second manipulator 54 is provided with a third industrial camera 6. Since the glass is easily deflected during the transmission process of the conveyor belt 53, the third industrial camera 6 can help the second manipulator 54 to position the glass, which helps the second manipulator 54 to accurately and stably transfer the glass to the positioning platform 511.

[0036] Please refer to Figure 1 As shown, in another optional embodiment, a third industrial camera 6 is provided on the conveyor belt 53. Since the glass is easily deflected during the transmission process of the conveyor belt 53, the third industrial camera 6 can help the second manipulator 54 to position the glass, which helps the second manipulator 54 to accurately and stably transfer the glass to the positioning platform 511.

[0037] Embodiment 1

[0038] A raster image projection device, see Figures 1 to 6As shown, it includes a detection bracket 1, a grid projection screen 2, a first industrial camera 3, a positioning support column 4 and a positioning assembly 5; the detection bracket 1 has a detection platform 11, the grid projection screen 2 is swingably arranged on the detection bracket 1, and the grid projection screen 2 can project a grid toward the table surface of the detection platform 11, and the first industrial camera 3 is arranged on the detection bracket 1, and the lens of the first industrial camera 3 faces the table surface of the detection platform 11. The projection surface of the grid projection screen 2 forms an angle of 30° with the table surface of the detection platform 11. A plurality of assembly holes 111 for installing the positioning support column 4 are arranged on the table surface of the detection platform 11. The positioning assembly 5 includes a positioning bracket 51, a first manipulator 52, a conveyor belt 53, and a second manipulator 54. The positioning bracket 51 has a positioning platform 511. A second industrial camera 512 is arranged on the positioning bracket 51. The lens of the second industrial camera 512 faces the table of the positioning platform 511. The gripping end of the first manipulator 52 goes back and forth between the positioning platform 511 and the detection platform 11. The conveyor belt 53 is used to receive the discharge end of the drying and bending furnace. The gripping end of the second manipulator 54 goes back and forth between the conveyor belt 53 and the positioning platform 511. A third industrial camera 6 is arranged on the second manipulator 54 or the conveyor belt 53.

[0039] Embodiment 2

[0040] A detection method comprises the following steps:

[0041] Step S1, positioning the glass on the table of the detection platform 11;

[0042] In step S1, after the glass is positioned on the table of the positioning platform 511 by the second industrial camera 512, the first manipulator 52 moves the glass to the table of the inspection platform 11 according to the position information provided by the second industrial camera 512;

[0043] Step S2, the grid projection screen 2 projects a grid onto the glass surface on the detection platform 11;

[0044] Step S3, the first industrial camera 3 acquires a grid image on the glass surface;

[0045] Step S4: obtaining the glass curvature according to the grid distortion on the obtained grid image.

[0046] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A grid image projection device, characterized in that: It includes a detection bracket, a grid projection screen and a first industrial camera; the detection bracket has a detection platform, the grid projection screen is swingably arranged on the detection bracket, the grid projection screen can project a grid toward the table top of the detection platform, and the first industrial camera is arranged on the detection bracket, and the lens of the first industrial camera faces the table top of the detection platform.

2. The grid image projection device according to claim 1, characterized in that: The projection surface of the grid projection screen forms an angle of 30° to 40° with the table surface of the detection platform.

3. The grid image projection device according to claim 2, characterized in that: The projection surface of the grid projection screen forms an angle of 30° with the table surface of the detection platform.

4. The grid image projection device according to claim 1, characterized in that: It also includes a positioning support column, and the table top of the detection platform is provided with a plurality of assembly holes for installing the positioning support column.

5. The grid image projection device according to claim 1, characterized in that: It also includes a positioning component, which includes a positioning bracket and a first manipulator. The positioning bracket has a positioning platform. A second industrial camera is arranged on the positioning bracket. The lens of the second industrial camera faces the table top of the positioning platform. The grabbing end of the first manipulator moves back and forth between the positioning platform and the detection platform.

6. The grid image projection device according to claim 5, characterized in that: The positioning assembly also includes a conveyor belt for receiving the discharge end of the drying and bending furnace, and a second manipulator, wherein the gripping end of the second manipulator moves back and forth between the conveyor belt and the positioning platform.

7. The grid image projection device according to claim 6, characterized in that: The second manipulator is provided with a third industrial camera.

8. The grid image projection device according to claim 6, characterized in that: A third industrial camera is arranged on the conveyor belt.

9. A detection method according to claim 5, characterized in that: The steps include: Step S1, positioning the glass on the table of the detection platform; Step S2, the grid projection screen projects a grid onto the glass surface on the detection platform; Step S3, the first industrial camera acquires a grid image on the glass surface; Step S4: obtaining the glass curvature according to the grid distortion on the obtained grid image.

10. The detection method according to claim 9, characterized in that: In step S1, after the glass is positioned on the table of the positioning platform by the second industrial camera, the first manipulator moves the glass to the table of the inspection platform according to the position information provided by the second industrial camera.

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