Surface defect detection device
High-temperature steam is sprayed onto the surface to be inspected by a spray unit. The heat-conducting particles are used to improve the vaporization rate and uniformity, which solves the problems of poor coating and poor uniformity of the detection liquid, and achieves efficient and accurate defect detection.
Patent Information
- Application Number
- CN202520418390.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-11
AI Technical Summary
In existing technologies, coating processes can lead to poor coating quality and affect coating uniformity. Furthermore, the detection liquid exhibits poor uniformity on the surface of the object being tested, which in turn affects the detection results.
A spray unit sprays high-temperature steam onto the surface to be inspected. A heating rod maintains a constant temperature of the liquid in the feed chamber. Heat-conducting particles are used to increase the contact area between the liquid and the heat source, thereby improving the vaporization rate and uniformity and forming a fine and uniform steam film. This, combined with a vision inspection unit, improves the inspection accuracy.
It improves the detection accuracy and micro-defect detection effect after coating, ensures the accuracy and consistency of steam emission, and enhances the uniformity and efficiency of detection.
Smart Images
Figure CN223897350U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of defect detection technology, and in particular to a surface defect detection device. Background Technology
[0002] Some glass products, such as glass covers for electronic devices like mobile phones, watches, tablets, and computers, are typically coated using processes like vacuum coating for aesthetic reasons and to prevent dirt accumulation. However, in actual industrial production, coating processes often cannot achieve uniform coverage, leading to poor coating quality and inconsistent coating uniformity due to various limitations. Therefore, coating quality inspection is necessary. This inspection typically involves applying a test liquid, usually alcohol or water vapor, to the surface of the object being inspected, while simultaneously using the human eye or a camera to detect defects. The uniformity of the test liquid on the surface of the object directly affects the inspection results. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a surface defect detection device that can improve the speed, efficiency and uniformity of vaporization, as well as improve the detection accuracy of the surface to be inspected and the detection effect of minute defects.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a surface defect detection device, comprising: a detection platform for placing the product to be inspected and a spray unit disposed above the detection platform, the spray unit for spraying onto the surface of the product to be inspected comprising: a body vertically disposed above the detection platform, a spray guide groove formed on the lower end surface of the body, a feeding chamber disposed inside the body and above the spray guide groove, a partition layer formed between the lower end of the feeding chamber and the spray guide groove, a plurality of through holes spaced apart on the partition layer connecting the feeding chamber and the spray guide groove, the upper end of the feeding chamber being connected to the outlet end of a three-way connector, the two inlet ends of the three-way connector being connected to a liquid inlet pipe and an air inlet pipe respectively, a plurality of spaced heating rods being embedded and installed inside the body and outside the feeding chamber, the feeding chamber being filled with heat-conducting particles, a mesh layer being disposed on the upper surface of the partition layer, the mesh aperture of the mesh layer covering the through holes being smaller than the outer diameter of the heat-conducting particles.
[0005] The following are further improvements to the above technical solution:
[0006] 1. In the above solution, an atomizing nozzle connected to the spray guide groove is installed at the lower end of the main body. The atomizing nozzle is used to spray onto the surface of the product to be inspected.
[0007] 2. In the above scheme, the detection platform is a mobile platform.
[0008] 3. The above solution also includes a vision inspection unit set above the inspection platform. The vision inspection unit, located behind the spraying unit in the direction of movement of the product to be inspected, is used to photograph the surface of the product to be inspected after spraying.
[0009] 4. In the above scheme, the product to be inspected is the display screen or glass cover of an electronic product.
[0010] 5. In the above scheme, the mesh layer is a metal mesh layer.
[0011] 6. In the above scheme, the body is a metal thermally conductive body, and the thermally conductive particles are metal particles.
[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0013] This utility model relates to a surface defect detection device. The spray unit for spraying onto the surface of a product to be inspected includes: a body vertically positioned above a detection platform; a spray guide groove is formed on the lower end face of the body; a feed chamber is formed inside the body above the spray guide groove; a partition layer is formed between the lower end of the feed chamber and the spray guide groove, spaced apart from each other; several through holes are spaced apart on this partition layer connecting the feed chamber and the spray guide groove; the upper end of the feed chamber is connected to the outlet end of a three-way connector; the two inlet ends of the three-way connector are respectively connected to a liquid inlet pipe and an air inlet pipe; and several spaced-apart nozzles are embedded and installed inside the body outside the feed chamber. The heating element has a feed chamber filled with heat-conducting particles. A mesh layer is installed on the upper surface of the partition layer, and the mesh size of the mesh layer covering the through holes is smaller than the outer diameter of the heat-conducting particles. The liquid entering the feed chamber is vaporized by high temperature, and the heat-conducting particles increase the contact area between the liquid and the heat source in the feed chamber and improve the uniformity of heating, thereby improving the vaporization speed, efficiency and uniformity. The vaporized steam is then sprayed outward from the spray guide channel to the surface of the product to be inspected by the high-pressure gas entering the feed chamber. The hot steam carrying heat forms a fine and uniform thin film layer on the surface to be inspected when it cools down, thereby improving the detection accuracy of the surface to be inspected and the detection effect of small defects. Attached Figure Description
[0014] Appendix Figure 1 This is a schematic diagram of the overall structure of the surface defect detection device of this utility model;
[0015] Appendix Figure 2 This is a partial structural schematic diagram of the surface defect detection device of this utility model;
[0016] Appendix Figure 3 Appendix to this utility model Figure 2 A schematic cross-sectional view along the middle AA section;
[0017] Appendix Figure 4 Appendix to this utility model Figure 3 A schematic diagram at point C in the middle;
[0018] Appendix Figure 5 Appendix to this utility model Figure 3 A schematic diagram at point D in the middle;
[0019] Appendix Figure 6 Appendix to this utility model Figure 2 A schematic cross-sectional view of the middle BB;
[0020] Appendix Figure 7 This is a partial structural schematic diagram of the surface defect detection device of this utility model.
[0021] In the attached diagrams: 100, Product to be inspected; 200, Testing platform; 300, Spray unit; 1, Main body; 2, Spray guide channel; 3, Feed chamber; 4, Partition layer; 41, Through hole; 5, Heating rod; 6, T-joint; 7, Mesh layer; 8, Temperature sensor; 9, Atomizing nozzle; 91, Connecting groove; 92, Discharge hole; 10, Mounting groove; 11, Feed baffle; 111, Feed hole; 12, Pressing block; 121, Feed trough. Detailed Implementation
[0022] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.
[0023] Example 1: A surface defect detection device includes: a detection platform 200 for placing a product 100 to be inspected and a spray unit 300 disposed above the detection platform 200. The spray unit 300 for spraying onto the surface of the product 100 to be inspected includes: a body 1 vertically disposed above the detection platform 200; a spray guide groove 2 is formed on the lower end surface of the body 1; a feed chamber 3 is formed inside the body 1 and above the spray guide groove 2; the lower end of the feed chamber 3, which is spaced apart from the spray guide groove 2, forms a gap with the spray guide groove 2. A partition layer 4 is formed, and several through holes 41 are spaced apart on the partition layer 4 to connect the feed chamber 3 and the spray guide channel 2. The upper end of the feed chamber 3 is connected to the outlet end of a three-way connector 6. The two inlet ends of the three-way connector 6 are respectively connected to the liquid inlet pipe and the air inlet pipe. Several heating rods 5 are embedded and installed in the body 1 and located outside the feed chamber 3. The feed chamber 3 is filled with heat-conducting particles. A mesh layer 7 is provided on the upper surface of the partition layer 4. The mesh size of the mesh layer 7 covering the through holes 41 is smaller than the outer diameter of the heat-conducting particles.
[0024] When in use, place the product to be inspected on the inspection platform. First, spray the surface of the product to be inspected through the spray unit. During the spraying process, when the area of the surface to be inspected is large, the spray unit can be moved or the inspection platform can be moved to make relative movement between the spray unit and the surface to be inspected, so as to achieve full-area spraying of the surface to be inspected.
[0025] Unlike conventional spray valves, the spray unit of this application introduces liquid (such as distilled water, ethanol, etc.) into the feed chamber. The feed chamber is maintained at a constant temperature (e.g., 200°C, which can be adjusted according to the physicochemical properties of the liquid in the feed chamber) by the heating rod. The liquid entering the feed chamber vaporizes under high temperature. During this process, the heat-conducting particles filling the feed chamber greatly increase the contact area between the liquid and the heat source, which can also improve the uniformity of liquid heating, thereby improving the vaporization speed and efficiency as well as the uniformity of steam formation.
[0026] The lower end of the aforementioned body 1 is equipped with an atomizing nozzle 9 that communicates with the spray guide groove 2. The atomizing nozzle 9 is used to spray onto the surface of the product 100 to be inspected.
[0027] The aforementioned testing platform 200 is a mobile platform.
[0028] The above also includes a visual inspection unit disposed above the inspection platform 200. The visual inspection unit, located behind the spray unit 300 in the direction of movement of the product to be inspected 100, is used to photograph the surface of the product to be inspected 100 after spraying.
[0029] The aforementioned product 100 to be inspected is a display screen for an electronic product.
[0030] The aforementioned mesh layer 7 is a metal mesh layer.
[0031] The aforementioned body 1 is a metal thermally conductive body, and the thermally conductive particles are metal particles.
[0032] Example 2: A surface defect detection device includes: a detection platform 200 for placing a product 100 to be inspected and a spray unit 300 disposed above the detection platform 200. The spray unit 300 for spraying onto the surface of the product 100 to be inspected includes: a body 1 vertically disposed above the detection platform 200; a spray guide groove 2 is formed on the lower end surface of the body 1; a feed chamber 3 is formed inside the body 1 and above the spray guide groove 2; the lower end of the feed chamber 3, which is spaced apart from the spray guide groove 2, forms a gap with the spray guide groove 2. A partition layer 4 is formed, and several through holes 41 are spaced apart on the partition layer 4 to connect the feed chamber 3 and the spray guide channel 2. The upper end of the feed chamber 3 is connected to the outlet end of a three-way connector 6. The two inlet ends of the three-way connector 6 are respectively connected to the liquid inlet pipe and the air inlet pipe. Several heating rods 5 are embedded and installed in the body 1 and located outside the feed chamber 3. The feed chamber 3 is filled with heat-conducting particles. A mesh layer 7 is provided on the upper surface of the partition layer 4. The mesh size of the mesh layer 7 covering the through holes 41 is smaller than the outer diameter of the heat-conducting particles.
[0033] The rapidly vaporized hot steam, under the influence of the gas entering the feed chamber through the three-way connector, is blown out of the spray unit through the spray guide channel and evenly dispersed onto the surface of the product to be inspected. The hot steam carrying heat cools and forms a fine and uniform liquid particle film on the surface to be inspected. The particle size of the liquid particles is much smaller than that of the spray particles from the spray valve, thereby improving the detection accuracy of the surface to be inspected and the detection effect on minor defects. It can also ensure the accuracy and consistency of the steam spray volume, and improve the consistency of inspection of the surface of different products to be inspected.
[0034] The lower end of the aforementioned body 1 is equipped with an atomizing nozzle 9 that communicates with the spray guide groove 2. The atomizing nozzle 9 is used to spray onto the surface of the product 100 to be inspected.
[0035] The aforementioned product 100 to be inspected is a glass cover for an electronic product.
[0036] The aforementioned mesh layer 7 is a metal mesh layer.
[0037] A temperature sensor 8 is embedded in the aforementioned body 1.
[0038] The upper end face of the aforementioned body 1 has an installation groove 10 that communicates with the upper end of the feeding chamber 3, and a feeding baffle 11 embedded in the installation groove 10 is fixedly installed on the body 1 by a pressure block 12.
[0039] The feed baffle 11 has a feed hole 111 extending along its length. The pressure block 12 has a feed groove 121 that mates with the feed hole 111 on its lower surface facing the feed baffle 11. The feed groove 121 is connected to the outlet end of the tee connector 6 through a pipeline.
[0040] The length of the feed groove 121 is the same as the length of the feed hole 111, the width of the feed groove 121 is greater than the width of the feed hole 111, and the length of the feed hole 111 is the same as the width of the upper end of the feed chamber 3.
[0041] The working principle of this utility model is as follows:
[0042] When in use, place the product to be inspected on the inspection platform. First, spray the surface of the product to be inspected through the spray unit. During the spraying process, when the area of the surface to be inspected is large, the spray unit can be moved or the inspection platform can be moved to make relative movement between the spray unit and the surface to be inspected, so as to achieve full-area spraying of the surface to be inspected.
[0043] Unlike conventional spray valves, the spray unit of this application introduces liquid (such as distilled water, ethanol, etc.) into the feed chamber. The feed chamber is maintained at a constant temperature (e.g., 200°C, which can be adjusted according to the physicochemical properties of the liquid in the feed chamber) by the heating rod. The liquid entering the feed chamber vaporizes under high temperature. During this process, the heat-conducting particles filling the feed chamber greatly increase the contact area between the liquid and the heat source, which can also improve the uniformity of liquid heating, thereby improving the vaporization speed and efficiency as well as the uniformity of steam formation.
[0044] The rapidly vaporized hot steam, under the influence of the gas entering the feed chamber through the three-way connector, is blown out of the spray unit through the spray guide channel and evenly dispersed onto the surface of the product to be inspected. The hot steam carrying heat cools and forms a fine and uniform liquid particle film on the surface to be inspected. The particle size of the liquid particles is much smaller than that of the spray particles from the spray valve, thereby improving the detection accuracy of the surface to be inspected and the detection effect on minor defects. It can also ensure the accuracy and consistency of the steam spray volume, and improve the consistency of inspection of the surface of different products to be inspected.
[0045] When using the above-mentioned surface defect detection device, the liquid in the feed chamber is vaporized by high temperature, and the contact area between the liquid and the heat source in the feed chamber and the uniformity of heating are increased by heat-conducting particles to improve the vaporization speed, efficiency and uniformity. Then, the vaporized steam is sprayed out from the spray guide channel to the surface of the product to be inspected by the high-pressure gas entering the feed chamber. The hot steam carrying heat forms a fine and uniform thin film layer on the surface to be inspected when it is cooled, thereby improving the detection accuracy of the surface to be inspected and the detection effect of small defects.
[0046] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A surface defect detection device, comprising: A testing platform (200) for placing the product to be inspected (100) and a spray unit (300) disposed above the testing platform (200), the spray unit (300) for spraying onto the surface of the product to be inspected (100) includes: a body (1) vertically disposed above the testing platform (200), characterized in that: a spray guide groove (2) is formed on the lower end surface of the body (1), and a feed chamber (3) is formed inside the body (1) and above the spray guide groove (2), and a partition layer (4) is formed between the lower end of the feed chamber (3) and the spray guide groove (2) spaced apart from the spray guide groove (2). The partition layer (4) has several through holes (41) spaced apart, connecting the feed chamber (3) and the spray guide channel (2). The upper end of the feed chamber (3) is connected to the outlet end of a three-way connector (6). The two inlet ends of the three-way connector (6) are connected to the liquid inlet pipe and the air inlet pipe, respectively. Several heating rods (5) are embedded in the body (1) and located outside the feed chamber (3). The feed chamber (3) is filled with heat-conducting particles. A mesh layer (7) is provided on the upper surface of the partition layer (4). The mesh aperture of the mesh layer (7) covering the through holes (41) is smaller than the outer diameter of the heat-conducting particles.
2. The surface defect detection device according to claim 1, characterized in that: The lower end of the body (1) is equipped with an atomizing nozzle (9) that communicates with the spray guide groove (2). The atomizing nozzle (9) is used to spray onto the surface of the product (100) to be inspected.
3. The surface defect detection device according to claim 1, characterized in that: The detection platform (200) is a mobile platform.
4. The surface defect detection device according to claim 3, characterized in that: It also includes a vision inspection unit located above the inspection platform (200), which is positioned behind the spray unit (300) in the direction of movement of the product to be inspected (100) and is used to photograph the surface of the product to be inspected (100) after spraying.
5. The surface defect detection device according to claim 1, characterized in that: The product to be inspected (100) is the display screen or glass cover of an electronic product.
6. The surface defect detection device according to claim 1, characterized in that: The mesh layer (7) is a metal mesh layer.
7. The surface defect detection device according to claim 1, characterized in that: The body (1) is a metal thermally conductive body, and the thermally conductive particles are metal particles.