Device for implementing liquid membrane coating

Abstract

A device for implementing liquid membrane coating, comprising a conveyor belt, a first driving roller and a second driving roller, disposed at left and right sides, respectively, inside the conveyor belt, a support member disposed at a bottom surface of the conveyor belt, and a pressing roller disposed at the left side of the conveyor belt; a scrubbing assembly and a cleaning sprinkler are disposed at the lower side of the conveyor belt, to clean the conveyor belt, and two squeezing drying rollers are disposed at the left side of the conveyor belt, to dry the conveyor belt after cleaning; a belt liquid tank is disposed at the left side of the conveyor belt, and a back coating roller is disposed in the belt liquid tank, the back coating roller applying a layer of adhesive liquid to a back surface of an article to be coated; after being pressed by the pressing roller, the article to be coated can tightly adhere to an outer ring of the conveyor belt, which can solve the problem of deviation of transmission of an article to be coated.

Description

A liquid film coating device Technical Field

[0001] The present invention relates to the technical field of coating devices, and in particular to a device for implementing liquid film coating. Background Art

[0002] During the preparation of photovoltaic cells, there is a need to coat the surface of silicon wafers with a liquid source. Currently, there is no equipment in the photovoltaic industry that can meet this coating requirement.

[0003] Existing patent publication number CN106468037A discloses a fiber web processing device that forms a processing nip between two rollers. A continuous soft fiber web passes through the nip for surface coating. However, this device is fundamentally unsuitable for the transport and coating of discontinuous silicon wafers. Patent TW201618861A discloses a device for cleaning paint contaminated by a circular motion drive element. However, if this structure is used to coat silicon wafers, the uneven surface of the conveyor belt can cause wafer deviation and deformation during transport. High spraying impact can cause wafers to fly or break. Patent JP2003205658A discloses a conveyor device suitable for fabrics. Its flat portion serves a similar purpose to the support structure in this application, but differs fundamentally from adjusting the conveyor belt's surface condition to suit the coating process. In the photovoltaic industry, coating targets are fast, discontinuous, thin, hard, and fragile objects. Besides ensuring production capacity, process requirements demand uniform coating and minimal fragmentation. Summary of the Invention

[0004] In order to improve the above-mentioned problem that it is difficult to evenly cover the upper side of the silicon wafer with a liquid source, the present invention provides a liquid film coating device.

[0005] The present invention provides a liquid film coating device, which adopts the following technical solutions:

[0006] A liquid film coating device includes a conveyor belt, wherein the left and right sides of the inner wall of the conveyor belt are rotatably connected to a transmission assembly, the transmission assembly is composed of a first transmission roller, a second transmission roller, a support member, a back coating roller and a pressure roller, the first transmission roller and the second transmission roller are respectively arranged on the left and right sides of the inner part of the conveyor belt, the support member is arranged on the bottom surface of the conveyor belt, the back coating roller and the pressure roller are arranged on the left side of the conveyor belt, and the coating assembly is arranged on the top of the conveyor belt;

[0007] A scrubbing assembly is provided on the lower side of the conveyor belt, and a dipping tank is provided on the bottom surface of the conveyor belt;

[0008] A cleaning shower is provided on the lower side of the left side of the conveyor belt, and two squeezing and drying rollers are provided on the left side of the conveyor belt, and the conveyor belt is located between the two squeezing and drying rollers;

[0009] A belt liquid tank is provided on the left side of the conveyor belt, and the workpiece to be coated is placed on the upper side of the conveyor belt.

[0010] The above technical solution facilitates the quick drying and cleaning of the outer ring of the conveyor belt, and enables a uniform layer of liquid source to be coated on the upper surface of the workpiece to be coated.

[0011] Optionally, in the above-mentioned liquid film coating device, the coating assembly is composed of a coating roller and a liquid roller, the coating roller is arranged on the right side of the top of the conveyor belt, the liquid roller is arranged on the upper side of the coating roller, and a liquid supply pipe is inserted into the side of the liquid roller.

[0012] According to the above technical solution, liquid can be supplied to the liquid-carrying roller through the liquid supply pipe.

[0013] Optionally, in the above-mentioned liquid film coating equipment, the scrubbing assembly is composed of a first scrubbing roller, a second scrubbing roller and an immersion roller, the first scrubbing roller and the second scrubbing roller are respectively arranged on the lower side of the conveyor belt, and the immersion roller is arranged on the lower side of the inner wall of the conveyor belt.

[0014] Through the above technical solution, the first scrubbing roller and the second scrubbing roller can be a sponge roller or a plastic-coated roller, or a combination of the two.

[0015] Optionally, in the above-mentioned liquid film coating device, the first scrubbing roller and the second scrubbing roller can be replaced with brush rollers or flat brushes.

[0016] Through the above technical solution, different cleaning liquids adhering to the side of the conveyor belt can be scraped off by replacing the brush roller or the flat brush.

[0017] Optionally, in the above-mentioned liquid film coating equipment, the back coating roller can be replaced with an atomizing or spraying device to perform different processing techniques on the coated part.

[0018] Through the above technical solution, the shower spray liquid for cleaning is pure water. After the conveyor belt is immersed and sprayed, the liquid source of the outer ring of the conveyor belt can be completely removed. The outer ring of the conveyor belt can be completely dried by the second scrubbing roller and the squeezing drying roller to ensure that the outer ring of the conveyor belt is in a completely clean state and contacts the back of the workpiece to be coated.

[0019] Optionally, in the above-mentioned liquid film coating device, the support member may be a support plate or a support roller.

[0020] Optionally, in the above-mentioned liquid film coating device, the support roller is on the inner ring of the conveyor belt and is located directly below the coating roller.

[0021] The above technical solution facilitates the back coating roller to apply a layer of adhesive liquid on the back of the workpiece to be coated. After being pressed by the pressure roller, the workpiece to be coated and the outer ring of the conveyor belt can be tightly fitted, eliminating the problem of transmission deviation of the workpiece to be coated.

[0022] Optionally, in the above-mentioned liquid film coating device, the squeeze drying roller can be replaced by an air knife or replaced by heating, and a suitable drying method can be selected for drying according to actual use requirements or limitations.

[0023] Through the above technical solution, it is convenient to use the device in different seasons by replacing the air knife or adopting different heating methods.

[0024] Optionally, in the above-mentioned liquid film coating device, the conveyor belt can be replaced by a plate chain structure.

[0025] The above technical solution makes it easy to place parts to be coated according to different requirements through the plate chain. Beneficial effects

[0026] In summary, the present invention includes at least one of the following beneficial effects: 1. When using the liquid film coating equipment to operate on the workpiece to be coated, the second transmission roller is driven by the driving source to drive the conveyor belt, and the conveyor belt is scrubbed by the first scrubbing roller. Then the outer ring of the conveyor belt is introduced into the immersion tank containing the cleaning liquid by the immersion roller, and then the outer ring of the conveyor belt is sprayed with pure water from the cleaning shower, and then scrubbed by the second scrubbing roller. The immersion and spray scrubbing can thoroughly clean the liquid source and dust impurities attached to the outer ring of the conveyor belt, and then the outer ring of the conveyor belt after cleaning is squeezed and dried by the squeezing drying roller to remove the cleaning liquid remaining on the outer ring of the conveyor belt. At this time, the outer ring of the conveyor belt is dry and clean.

[0027] 2. The driving source drives the back coating roller to rotate. When the back coating roller passes through the liquid tank, the surface of the back coating roller is coated with the back coating liquid. After the back of the coated part is transmitted by the back coating roller, the back is coated with the back coating liquid, and then it is transmitted to the conveyor belt. After being pressed by the pressure roller, the coated part can be tightly fitted on the outer ring of the conveyor belt through the back coating liquid, eliminating the problem of transmission deviation of the coated part. The conveyor belt is placed horizontally to transport the coated part. The liquid source is transported between the liquid roller and the coating roller through the liquid supply pipe. The outer ring of the conveyor belt is completely leveled by the support to ensure the horizontality of the tightly fitted coated part and the conveyor belt, eliminating the problem of transmission deformation of the coated part. The coated part passes through the gap between the conveyor belt and the coating roller. The driving source drives the coating roller to rotate. The coating roller can coat a uniform layer of liquid source on the surface of the coated part. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic structural diagram of a liquid film coating device according to the present invention;

[0029] FIG2 is a schematic structural diagram of a liquid film coating device according to the present invention, wherein the conveyor belt is supported by a support plate;

[0030] FIG3 is a schematic structural diagram of the present invention in which the conveyor belt of the liquid film coating equipment is supported by support rollers.

[0031] In the figure: 1. Conveyor belt; 2. Transmission assembly; 21. First transmission roller; 22. Second transmission roller; 23. Support member; 24. Back coating roller; 25. Pressing roller; 3. Coating assembly; 31. Coating roller; 32. Liquid roller; 4. Liquid supply pipe; 5. Scrubbing assembly; 51. First scrubbing roller; 52. Immersing roller; 53. Second scrubbing roller; 6. Immersing tank; 7. Cleaning shower; 8. Squeeze drying roller; 9. Parts to be coated; 10. Liquid tank. Modes for Carrying Out the Invention DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The present invention will be further described in detail below with reference to Figures 1-3.

[0036] Please refer to Figures 1, 2 and 3 of the accompanying drawings of the specification for an embodiment of the present invention: a liquid film coating device, including a conveyor belt 1, which can be made of nylon, PVC, PE, silicone, Teflon or other corrosion-resistant soft belts with a Shore A hardness between 20 and 70 HA and a roughness Ra between 0.008 and 80 μm. The left and right sides of the inner wall of the conveyor belt 1 are rotatably connected to a transmission assembly 2, which is composed of a first transmission roller 21, a second transmission roller 22, a support member 23, a back coating roller 24 and a pressure roller 25. The first transmission roller 21 and the second transmission roller 22 are respectively arranged on the left and right sides of the conveyor belt 1, the support member 23 is arranged on the bottom surface of the conveyor belt 1, the back coating roller 24 and the pressure roller 25 are arranged on the left side of the conveyor belt 1, wherein the back coating roller 24 can be made of a sponge roller, the back coating roller 24 can be made of a sponge roller, a threaded roller, a flower roller, a rubber roller or a plastic-coated roller, wherein the threaded roller adopts a roller body with a thread depth of 0.1~1mm and a pitch of 0.1~10mm, and the rubber roller adopts a roller body with a Shore A hardness of 20~80HA. A coating component 3 is provided on the top of the conveyor belt 1, and the coating component 3 performs coating operations on the to-be-coated parts 9 on the conveyor belt 1.

[0037] A scrubbing assembly 5 is provided on the lower side of the conveyor belt 1, which scrubs and cleans the conveyor belt 1 passing through. A dipping tank 6 is provided on the bottom surface of the conveyor belt 1, and a cleaning shower 7 is provided on the lower side of the left side of the conveyor belt 1. Two squeezing and drying rollers 8 are provided on the left side of the conveyor belt 1, wherein the squeezing and drying rollers 8 can be sponge rollers, and their materials can be PVA, PO, PVC, PU, ​​PI or PP. The Shore C hardness of the sponge roller is 5~90HC, and the surface pore size is 10~500um. The conveyor belt 1 is located between the two squeezing and drying rollers 8, and a liquid tank 10 is provided on the left side of the conveyor belt 1. The part to be coated 9 is placed on the upper side of the conveyor belt 1, and the part to be coated 9 can be made of materials such as silicon wafers.

[0038] 1, 2, and 3 of the accompanying drawings, the coating assembly 3 is composed of a coating roller 31 and a liquid impregnation roller 32. The coating roller 31 is positioned on the right side of the top of the conveyor belt 1, and the liquid impregnation roller 32 is positioned above the coating roller 31. A liquid supply pipe 4 is plugged into the side of the liquid impregnation roller 32 to supply liquid to the liquid impregnation roller 32. The liquid impregnation roller 32 and the coating roller 31 can be one or more of a threaded roller, an anilox roller, a rubber roller, a plastic-coated roller, or a sponge roller. When a threaded roller is used, the thread depth of the threaded roller is 0.1-1 mm and the pitch is 0.1-10 mm. When an anilox roller is used, the mesh size of the anilox roller is 20-1200. When a rubber roller is used, the Shore A hardness of the rubber roller is 10-80 HA. When a sponge roller is used, the Shore C hardness of the sponge roller is 5-90 HC and the surface pore size is 10-1000 μm.

[0039] 1, 2 and 3 in the accompanying drawings of the specification, the scrubbing assembly 5 is composed of a first scrubbing roller 51, a second scrubbing roller 53 and an immersion roller 52. The first scrubbing roller 51 and the second scrubbing roller 53 are respectively arranged on the lower side of the conveyor belt 1, and the immersion roller 52 is arranged on the lower side of the inner wall of the conveyor belt 1. The first scrubbing roller 51 and the second scrubbing roller 53 can be one of sponge rollers or plastic-coated rollers, or a combination of both.

[0040] 1, 2 and 3 in the accompanying drawings of the specification, the back coating roller 24 can be replaced with an atomizing or spraying device to perform different processes on the coated member 9. The cleaning shower 7 sprays pure water. After immersion and spraying, the conveyor belt 1 can completely remove the liquid source on the outer ring of the conveyor belt 1. The outer ring of the conveyor belt 1 can be thoroughly dried by the second scrubbing roller 53 and the squeezing drying roller 8 to ensure that the outer ring of the conveyor belt 1 is in a completely clean state and contacts the back of the member 9 to be coated.

[0041] 1, 2 and 3 in the accompanying drawings of the specification, when the support member 23 is a support roller, the support roller is on the inner ring of the conveyor belt 1 and is located directly below the coating roller 31. The back coating roller 24 applies a layer of adhesive on the back of the workpiece 9 to be coated. After being pressed by the pressure roller 25, the workpiece 9 to be coated and the outer ring of the conveyor belt 1 can be tightly fitted, eliminating the problem of transmission deviation of the workpiece 9 to be coated.

[0042] 1, 2 and 3 of the accompanying drawings, the first scrubbing roller 51 and the second scrubbing roller 53 can be replaced with brush rollers or flat brushes. By replacing the brush rollers or flat brushes, different cleaning liquids adhering to the side of the conveyor belt 1 can be scraped off.

[0043] Referring to Figures 1, 2, and 3 of the accompanying drawings, the squeeze drying roller 8 can be replaced with an air knife or a heating method. By replacing the air knife or adopting different heating methods, the device can be used more conveniently in different seasons. The appropriate drying method can be selected according to actual use requirements or limitations.

[0044] 1, 2 and 3 of the accompanying drawings, the conveyor belt 1 can be replaced by a plate chain structure, and the plate chain can be used to place the parts 9 to be coated according to different requirements.

[0045] Working principle: When the liquid film coating equipment is used to operate on the workpiece 9 to be coated, the driving source drives the second transmission roller 22 to rotate, driving the conveyor belt 1 to transmit. When the outer ring of the conveyor belt 1 rotates to the lower part of the conveyor belt, the outer ring of the conveyor belt 1 is first scrubbed by the first scrubbing roller 51, and then the outer ring of the conveyor belt 1 is introduced into the immersion tank 6 containing the cleaning liquid by the immersion roller 52 for immersion. Then the outer ring of the conveyor belt 1 is sprayed with pure water by the cleaning shower 7, and then scrubbed by the second scrubbing roller 53. The immersion and spray scrubbing can thoroughly clean the liquid source and dust impurities attached to the outer ring of the conveyor belt 1. Then the outer ring of the conveyor belt 1 after cleaning is squeezed and dried by the squeezing and drying roller 8 to remove the residual cleaning liquid on the outer ring of the conveyor belt 1. At this time, the outer ring of the conveyor belt 1 is dry and clean.

[0046] The driving source drives the back coating roller 24 to rotate. When the back coating roller 24 passes through the liquid tank 10 containing the back coating liquid, the back of the backing member 9 is coated with the back coating liquid after being transmitted by the back coating roller 24, and then is transmitted to the dry and clean outer ring of the conveyor belt 1. After being pressed by the pressure roller 25, the backing member 9 to be coated can be tightly fitted on the outer ring of the conveyor belt 1 through the back coating liquid, eliminating the problem of transmission deviation of the backing member 9 to be coated. The conveyor belt 1 is placed horizontally to transport the backing member 9 to be coated. The liquid source is transported between the liquid-carrying roller 32 and the coating roller 31 through the liquid supply pipe 4. The outer ring of the conveyor belt 1 is completely leveled by the support member 23 to ensure the horizontality of the closely fitted backing member 9 and the conveyor belt 1, eliminating the problem of transmission deformation of the backing member 9 to be coated. The backing member 9 to be coated passes through the gap between the conveyor belt 1 and the coating roller 31. The driving source drives the coating roller 31 to rotate. The coating roller 31 can coat a uniform layer of liquid source on the surface of the backing member 9 to be coated.

[0047] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An apparatus for implementing liquid film coating, comprising a conveyor belt (1), characterized in that: On the left and right sides of the inner wall of the conveyor belt (1), there are rotationally connected drive components (2). The drive component (2) is composed of a first drive roller (21), a second drive roller (22), a support member (23), a back coating roller (24), and a pressure roller (25). The first drive roller (21) and the second drive roller (22) are respectively arranged on the left and right sides inside the conveyor belt (1). The support member (23) is arranged on the bottom surface of the conveyor belt (1). The back coating roller (24) and the pressure roller (25) are arranged on the left side of the conveyor belt (1). On the top of the conveyor belt (1), there is a coating component (3); On the lower side of the conveyor belt (1), there is a scrubbing component (5). On the bottom surface of the conveyor belt (1), there is a dipping tank (6); On the lower side of the left side of the conveyor belt (1), there is a cleaning shower head (7). On the left side of the conveyor belt (1), there are two squeezing and drying rollers (8). The conveyor belt (1) is located between the two squeezing and drying rollers (8); On the left side of the conveyor belt (1), there is a liquid holding tank (10). On the upper side of the conveyor belt (1), there is a workpiece to be coated (9) placed; 2. The liquid film coating device according to claim 1, wherein: The coating component (3) is composed of a coating roller (31) and a liquid-carrying roller (32). The coating roller (31) is arranged on the right side of the top of the conveyor belt (1). The liquid-carrying roller (32) is arranged above the coating roller (31). A liquid supply pipe (4) is inserted into the side surface of the liquid-carrying roller (32).

3. The liquid film coating device according to claim 1, characterized in that: The scrubbing component (5) is composed of a first scrubbing roller (51), a second scrubbing roller (53), and a dipping roller (52). The first scrubbing roller (51) and the second scrubbing roller (53) are respectively arranged on the lower side of the conveyor belt (1). The dipping roller (52) is arranged on the lower side of the inner wall of the conveyor belt (1).

4. The liquid film coating device according to claim 3, wherein: The first scrubbing roller (51) and the second scrubbing roller (53) are replaced with brush roller shafts or flat brushes.

5. The liquid film coating device according to claim 1, characterized in that: The back coating roller (24) is replaced with an atomizing or spraying device to perform different processes on the workpiece to be coated (9).

6. The liquid film coating device according to claim 1, characterized in that: The support member (23) is a support plate or a support roller.

7. An implementation of a liquid film coating device according to claim 6, characterized in that: The support roller is inside the inner ring of the conveyor belt (1) and is directly below the coating roller (31).

8. A liquid film coating device according to claim 1, wherein: The squeezing and drying roller (8) is replaced with an air knife or replaced by a heating method.

9. The liquid film coating device according to claim 1, characterized in that: The conveyor belt (1) is replaced with a plate chain structure.

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