Coating die head shifting device, film coating device and film coating method

Abstract

The present invention discloses a coating die head shifting device, a coating device including the coating die head shifting device, and a coating method suitable for the coating die head shifting device. The shifting device includes a coating die head and a shifting mechanism, the shifting mechanism includes a seat body, a guide body, a synchronous belt and a driving motor, the coating die head and the driving motor are both fixed on the seat body, the seat body and the guide body are clearance-matched, the synchronous belt is arranged on the guide body and the synchronous belt passes through the seat body and cooperates with a pulley arranged on the output end of the driving motor to move the seat body along the guide body. In this scheme, the structure of the coating die head shifting device is simplified, with the seat body and the guide body clearance-matched and with the cooperation of the motor and the synchronous belt on the guide body, the seat body moves along the guide body to synchronously move the coating die head. The shifting device under this structure has the advantages of low cost, convenient assembly, transportation, carrying and use.

Description

Technical Field

[0001] The present invention relates to the technical field of film coating devices, and in particular to a coating die head shifting device, a film coating device comprising the coating die head shifting device, and a film coating method suitable for the film coating device. Background Art

[0002] Taking the photovoltaic industry as an example, photovoltaic power generation is currently in a mature stage. The photoelectric conversion efficiency in the photovoltaic power generation process directly affects the power generation. Solar panels are mostly used in flat power stations and tilt power stations. After long-term use, dust, bird droppings and other stains are prone to accumulation on the surface of photovoltaic glass, which directly affects the efficiency of solar power generation. The glass on the surface of photovoltaic panels needs to be cleaned regularly. In order to reduce the cleaning frequency and improve the power generation efficiency, functional materials are coated on the glass surface of photovoltaic modules. The coating functional layer can effectively solve the problem of stain adhesion and accumulation on the surface of photovoltaic glass.

[0003] There are many coating methods to choose from in terms of product coating process. The existing coating methods in the photovoltaic industry include spraying, pulling, spin coating, roller coating, scraping and other coating methods. The coating thickness obtained by manual spraying and scraping is quite different, and the coating effect will also be significantly affected. Most coating methods are more suitable for the glass substrate production stage. Due to the complex structure of the coating device, it is not convenient to move, transport and assemble, which limits its application range, especially when coating the surface of the assembled components of the power station. Manual coating will cause uneven spreading in individual areas, resulting in different thicknesses and uncontrollable thickness, and the effect is poor, which needs to be improved. Summary of the invention

[0004] To solve at least one of the above technical defects, the present invention provides the following technical solutions:

[0005] The present application document discloses a coating die head shifting device, comprising a coating die head and a shifting mechanism, wherein the shifting mechanism comprises a seat body, a guide body, a synchronous belt and a driving motor, wherein the coating die head and the driving motor are both fixed on the seat body, the seat body and the guide body are clearance-matched, the synchronous belt is arranged on the guide body and the synchronous belt passes through the seat body and cooperates with a pulley arranged at the output end of the driving motor to move the seat body along the guide body.

[0006] In this scheme, the structure of the coating die head shifting device is simplified. With the clearance between the seat body and the guide body and the cooperation of the motor and the synchronous belt on the guide body, the seat body moves along the guide body to synchronously move the coating die head. The shifting device under this structure has the advantages of low cost, convenient assembly, transportation, carrying and use.

[0007] For the structure of the coating die, the model and structure on the market can be selected according to the needs. A slit coating die is preferably used. The flow channel design of the die can be designed as a gradient type, hanger type, cavity-free direct current, single chamber, double chamber or multi-chamber trough structure, and the die feed can be selected as a side feed according to the needs.

[0008] Regarding the matching structure between the synchronous belt and the seat body and the pulley on the driving motor, it is preferred that: guide wheel one and guide wheel two are respectively arranged at the seat body positions on both sides of the pulley, and the synchronous belt is sequentially wound around guide wheel one, the pulley and guide wheel two, and under the action of the guide wheels, the synchronous belt is matched with the pulley on the output end of the driving motor. Of course, multiple guide wheels or similar mechanisms can be added according to needs.

[0009] For the structure in which the seat body moves along the guide body, such as the common through-hole matching, a hole is set through the seat body, and the guide body passes through the hole to make the seat body move along the guide body, and the size of the guide body is adjusted to match the hole gap.

[0010] Of course, a common slide rail and slide seat matching structure can also be adopted, the slide rail is fixed on the guide body, and the seat body surface is formed with a slide groove matching the slide rail to form the slide seat.

[0011] The preferred seat structure is as follows: the seat includes a main body and a mounting plate, a hole is set through the main body for the guide body to pass through, the mounting plate is fixed at the top position of the main body, the drive motor is fixed on the mounting plate, the output shaft of the drive motor passes through the hole opened in the mounting plate and a pulley is set, guide wheel 1 and guide wheel 2 are respectively set on both sides of the pulley, and the synchronous belt is successively wound around guide wheel 1, pulley and guide wheel 2. Under this structure, a mounting plate is added to facilitate the installation of the drive motor and guide wheel. Two mounting plates can be selected and relatively installed on the top surface of the main body to facilitate the limiting of the synchronous belt.

[0012] Regarding the fixing of the coating die head to the seat body, for example, the coating die head is directly fixed to the seat body, or a mounting frame can be selected to be fixed on the bottom surface or side surface of the body, and the mounting frame is fixed to the coating die head. For example, when the seat body and the guide body are matched through holes, it is preferred to fix the coating die head to the bottom end surface of the seat body through the mounting frame. When the slide rail and the slide seat are matched, the coating die head can also be fixed to the bottom end surface or side surface of the seat body through the mounting frame, which can be selected according to needs.

[0013] Furthermore, rollers are arranged at both ends of the bottom of the coating die to form rolling friction with the workpiece to be coated. Under this structure, there is no need for an external supporting mechanism to support or fix the guide body. The rollers on the coating die can be directly used as support to keep the coating die balanced. The coating direction can be directly moved by holding the end of the guide body, or the coating die can be moved, which is convenient for carrying and use.

[0014] Preferably, the guide body is a telescopic rod, and both ends of the synchronous belt are respectively fixed to the head and tail ends of the guide body. The telescopic structure helps to reduce the volume and is convenient to carry and use.

[0015] The present application document provides a coating device, including the above-mentioned coating die head shifting device, and also includes a feeding system, the feeding system includes a glue supply pump and a feeding pipeline, the glue supply pump feed port is connected to an external raw material barrel, the glue supply pump discharge port is connected to the feeding pipeline, and the feeding pipeline is connected to the coating die head liquid inlet.

[0016] A feeding system is added to the above-mentioned coating die head shifting device, with a glue supply pump as the power, and the coating die head is connected with a feed pipe. Preferably, the glue supply pump is independent of the above-mentioned shifting device and connected with a feed pipeline. When in use, the feed port of the glue supply pump can be connected with the raw material barrel directly or through a pipeline, or when used for a long time, the glue supply pump can be directly fixed in the raw material barrel to replace the glue liquid in the raw material barrel.

[0017] Furthermore, it also includes a battery-type power supply group, which is connected to the glue supply pump and the drive motor. Adding the battery power supply group facilitates use when power is off, and improves flexibility and facilitates movement.

[0018] Furthermore, it also includes a control panel, which is connected to the glue supply pump and the drive motor for easy control. For example, the control panel can be fixed on the guide body, or directly wirelessly connected to various components in the coating equipment, which can be selected according to needs.

[0019] The present application document provides a coating method, including the above-mentioned equipment, wherein the coating die is a slit coating die, the slit coating die includes a main body located at the upper part and a cutter head located at the lower part, the two opposite side surfaces of the cutter head are inclined so that the cutter head is triangular, and when coating, the distance between the surface to be coated and the end of the coating lip of the coating head is kept at 200-500μm, and within the temperature range of 0-50℃, the coating thickness is calculated as follows:

[0020]

[0021] Where t is the film thickness, s is the moving speed of the coating die head, η is the colloid viscosity, ρ is the colloid density, g is the gravity constant, σ is the surface tension, α is the meniscus angle, and Qη is the volume flow rate.

[0022] Under the above-mentioned coating equipment, the inventor studied the factors affecting the coating thickness, and obtained the calculation formula for the above-mentioned film layer after a large number of experiments. By adjusting various influencing factors to accurately control the thickness of the coating, accurate coating is facilitated.

[0023] Furthermore, the coating die head moving speed s is 100-1500 mm / min.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention simplifies the structure of the coating die head shifting device. Under the action of the driving motor and the synchronous belt, the base body moves along the guide body to synchronously move the coating die head, which reduces the cost and facilitates transportation, assembly and carrying. A coating device and a coating method are provided, which facilitate and accurately control the film thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a structural diagram of the coating die shifting device in Example 1;

[0028] Figure 2 This is a diagram showing the coordination structure of the driving motor and the synchronous belt on the seat body in Embodiment 1;

[0029] Figure 3 is a structural diagram of the coating equipment in Example 2;

[0030] Figure 4 This is the angle diagram of the meniscus when the liquid is applied;

[0031] Figure 5 This is a structural diagram of a cavity-free DC coating die head;

[0032] Figure 6 This is a structural diagram of a single-cavity coating die;

[0033] Figure 7 This is a diagram of the structure of a multi-cavity coating die;

[0034] Figure 8 Comparison of the transmittance of photovoltaic glass before and after coating;

[0035] Fig. 9 Comparison of transmittance of photovoltaic glass after double 85 test;

[0036] Fig.10 Comparison of the transmittance of the coated photovoltaic glass after salt spray test;

[0037] Fig.11 Comparison of the transmittance of the coated photovoltaic glass after high and low temperature tests;

[0038] Fig.12 Coating hydrophobicity test chart;

[0039] Fig.13 Coating thickness detection chart.

[0040] Wherein, the accompanying drawings are marked as follows:

[0041] 1. Base body; 2. Guide body; 3. Drive motor; 4. Synchronous belt; 5. Coating die head; 6. Handle; 7. Fixed seat; 8. Pulley; 9. Guide wheel 1; 10. Guide wheel 2; 11. Roller; 12. Mounting frame; 13. Raw material barrel; 14. Glue supply pump; 15. Feed pipeline; 16. Power supply group; 17. Control panel; 100. Main body; 101. Mounting plate. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] like Figure 1 As shown, the coating die head shifting device includes a coating die head 5 and a shifting mechanism, the shifting mechanism includes a base body 1, a guide body 2, a synchronous belt 4 and a driving motor 3, the coating die head 5 is fixed on the bottom end face of the base body 1, the driving motor 3 is fixed on the side position of the top end of the base body, the base body 1 moves along the guide body 2, the synchronous belt 4 extends along the length direction of the guide body 2 and the two ends are fixed at the two end positions of the guide body 2 through a fixed seat 7, the fixed seat is a ring structure, which is directly mounted on the guide body and fixed, and the top of the fixed seat is clamped and fixed with the cover plate by bolts.

[0045] In this embodiment, the structure in which the seat body 1 moves along the guide body 2 is a perforated matching structure, such as Figure 2 As shown, the seat body includes a rectangular body 100 and a mounting plate 101 fixed at the top. The body 100 is penetrated with an opening along the axial direction of the guide body 2, and the cylindrical guide body passes through the hole and is clearance-matched. The guide body 2 is located above the coating die 5. The mounting plate 101 is a flat plate body. The two mounting plates are relatively fixed on the top surface of the body 100. A driving motor 3 is fixed on one of the mounting plates. A stepping motor is selected. The output shaft of the driving motor passes through the hole opened on the mounting plate 101 and is covered with a pulley 8. The mounting plates on both sides of the pulley are installed with a guide wheel 1 9 and a guide wheel 2 10 through an axis body. The synchronous belt passes from below the guide wheel 1, above the pulley and below the guide wheel 2. The driving motor drives the pulley to rotate. Under the action of the synchronous belt, the seat body moves along the guide body to synchronously move the coating die. The coating die is connected to the glue supply system to start coating.

[0046] like Figure 1As shown, in this embodiment, the seat body 1 is connected to the coating film head 5 through the mounting frame 12. The mounting frame 12 is fixed by bolts or welding on the main body 100 of the seat body 1. The mounting frame is groove-shaped, and the coating die head 5 is fixed by bolts or welding in the groove cavity. Rollers 11 are installed at the notches at both ends. For easy operation, a handle 6 is installed at the end of the guide body 2. Under this structure, the position of the coating die head can be moved or adjusted directly by applying force to the handle. For easy carrying, a telescopic rod composed of multiple sleeves can be selected as the guide body 2 according to needs, and the two ends of the synchronous belt 4 are respectively fixed at the head and tail ends of the telescopic rod.

[0047] For the structure of the coating die head, in this embodiment, Figure 6 The single cavity slot coating die head shown in the figure includes an upper main body and a lower triangular cutter head. The main body has a single cavity. Of course, it can also be as Figure 5 The non-cavity direct current slot coating die shown, or choose Figure 7 The multi-cavity slot coating die is shown.

[0048] Example 2

[0049] like Figure 3 As shown, in this embodiment, a coating device is provided, and a feeding system is added to the displacement device shown in Example 1. The feeding system includes a glue pump 14 and a feeding pipeline 15. In this embodiment, the glue pump 14 is directly installed on the inner wall of the raw material barrel 13 cavity, and the feeding pipeline 15 is fixed at the discharge port of the glue pump 14. The feeding pipeline extends from the raw material barrel and is connected to the liquid inlet on the side of the coating die 5. The feeding system is relatively independent from the coating die displacement device. At the same time, in order to reduce the demand for power supply, a power supply group 16 is added in this embodiment. The power supply group is a structure in which multiple batteries are installed in the box body, and the power supply group supplies power to the drive motor and the glue pump.

[0050] Of course, for the convenience of control, a control panel 17 is added in this embodiment, which is directly fixed at the end of the guide body 4 near the handle. The control panel panel is connected to the drive motor, glue pump and power supply group to facilitate the staff to manually adjust the moving speed, glue supply speed, etc.

[0051] Use, coating steps are as follows:

[0052] First, glue

[0053] 1. Preparation of coating solution

[0054] Step (1) synthesizing hollow silica nanospheres modified by a silane coupling agent; by weight, 0.2 parts of 3-glycidyloxypropyltrimethoxysilane and 2 parts of hollow silica nanospheres are mixed, added to an ethanol solvent, stirred at 60° C. for 6 hours, and then removed;

[0055] Step (2) Solution A: 8 parts of tetraethyl orthosilicate and the modified hollow silica nanospheres prepared in step (1) were mixed in a mass ratio of 4:1, added to 60 parts of ethanol solvent, and stirred for 3 hours under the catalyst of 0.8 parts of hydrochloric acid (content 3.43%);

[0056] Step (3) Solution B: Dissolve 2 parts of antimony tin oxide in 5 parts of ethanol solvent and stir for 6 hours to obtain Solution B;

[0057] Step (4) The solution A obtained in step (2) and the solution B obtained in step (3) are mixed and stirred at room temperature for 24 hours, and then aged in an oven at 60° C. for 3 days to obtain a coating liquid colloid.

[0058] 2. Glass plate coating layer

[0059] The viscosity, density and surface tension of the colloid were tested and kept on file. The prepared colloid was added into the raw material barrel. The equipment was placed on the cleaned and dried photovoltaic glass substrate. The ambient temperature was maintained at 10-50°C. During coating, the distance between the surface to be coated and the end of the coating lip of the coating head was maintained at 200 μm. The glue supply pump made the volume flow rate Qη of the coating die slit outlet 15 L / min, the meniscus angle α was selected to be 60°, the colloid viscosity was 2 mPa·s, the surface tension was 22.32 mN / m, and the density was 0.8 g / cm 3 The control panel controls the drive motor to move forward at a speed of 120 mm / min (s). After the coating is completed, it is left to dry naturally. The thickness of the dried film is tested. The thickness of the dried film is 126 nm. Fig.13 At the same time, the performance of the coated glass plate is tested, such as Figure 8-12 As shown, the glass plate has excellent transmittance and water repellency properties after coating.

[0060] The thickness of the film layer is calculated to be 125 nm according to the following formula using parameters such as viscosity, density, and moving speed, which is consistent with the actual value. It can be seen that the thickness of the film layer can be accurately controlled under this method.

[0061]

[0062] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A film coating method, comprising a film coating device, characterized in that: The coating equipment includes a coating die head shifting device and a feeding system. The coating die head shifting device includes a coating die head and a shifting mechanism. The shifting mechanism includes a seat, a guide body, a synchronous belt and a driving motor. The coating die head and the driving motor are fixed on the seat body. The seat body and the guide body are gap-matched. The synchronous belt is arranged on the guide body and passes through the seat body and cooperates with the pulley arranged at the output end of the driving motor to make the seat body move along the guide body. The feeding system includes a glue supply pump and a feeding The feed port of the glue pump is connected to the external raw material barrel, the discharge port of the glue pump is connected to the feed pipeline, and the feed pipeline is connected to the liquid inlet of the coating die head. The coating die head is a slit coating die head, which includes a main body located at the upper part and a cutter head located at the lower part. The two opposite sides of the cutter head are inclined so that the cutter head is triangular. When coating, the distance between the surface to be coated and the end of the coating lip of the coating head is kept at 200-500μm. In the temperature range of 0-50℃, the coating thickness is calculated as follows: Where t is the film thickness, s is the speed of the coating die head, η is the colloid viscosity, ρ is the colloid density, g is the gravity constant, σ is the surface tension, α is the meniscus angle, Q η is the volume flow rate.

2. The film coating method according to claim 1, characterized in that: The coating die moving speed s is 100-1500 mm / min.

3. The film coating method according to claim 1, characterized in that: A guide wheel 1 and a guide wheel 2 are respectively arranged at the seat positions on both sides of the pulley, and the synchronous belt is wound around the guide wheel 1, the pulley and the guide wheel 2 in sequence.

4. The film coating method according to claim 1, characterized in that: The seat body is penetrated with a hole, and the guide body passes through the hole so that the seat body moves along the guide body.

5. The film coating method according to claim 4, characterized in that: The seat body includes a main body and a mounting plate. A hole is set through the main body for the guide body to pass through. The mounting plate is fixed at the top position of the main body. The driving motor is fixed on the mounting plate. The output shaft of the driving motor passes through the hole opened on the mounting plate and a pulley is set. Guide wheel 1 and guide wheel 2 are respectively set on both sides of the pulley. The synchronous belt is wound around guide wheel 1, pulley and guide wheel 2 in sequence.

6. The film coating method according to claim 5, characterized in that: The bottom surface or the side surface of the main body is fixed with a mounting frame, and the mounting frame is fixed with the coating die head.

7. The film coating method according to claim 1, wherein: Rollers are arranged at both ends of the bottom of the coating die head to form rolling friction with the workpiece to be coated.

8. The film coating method according to claim 1, wherein: The coating die is a slit coating die.

9. The film coating method according to claim 1, wherein: The guide body is a telescopic rod, and the two ends of the synchronous belt are respectively fixed at the head and tail ends of the guide body.

10. The film coating method according to claim 1, characterized in that: It also includes a battery-type power supply group, which is connected to the glue supply pump and the drive motor.

11. The film coating method according to claim 1, characterized in that: It also includes a control panel, which is connected to the glue supply pump and the drive motor.

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