Coating system and method of conformal coating

Abstract

The invention provides a coating system and method for conformal coating. The coating system comprises a vacuum pump, a vacuum chamber and a spray gun. Wherein the vacuum pump is used for pumping air in the vacuum chamber according to the expected vacuum degree; and if the vacuum chamber reaches the expected vacuum degree, the target product is coated by the spray gun according to the expected coating thickness. By adopting the technical scheme provided by the invention, the coating quality and permeability are enhanced, the pollution to the environment is reduced, meanwhile, the production cost is saved, the coating requirements of different types of products can be met, the coating is widely applied to multiple fields, the protection performance of the products is improved, and the service life of the products is effectively prolonged.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a coating system and method for triple-conformal paint. Background Art

[0002] In many fields such as electronic manufacturing, conformal coatings are used to protect against moisture, salt spray, mildew, etc. The coating of conformal coatings is a key process. At present, this operation is mainly completed by special conformal coating equipment. This equipment is designed to be able to achieve coating and automatic detection functions. During the coating process, the entire operation is carried out in an indoor environment, that is, the coating work is carried out under standard conditions of atmospheric pressure. The coating equipment will evenly coat the conformal coating on the surface of the target object according to the set procedures and parameters.

[0003] However, when the conformal coating falls from the nozzle of the coating equipment and has not yet reached the surface of the target object, it will fully contact the surrounding air. Since the conformal coating has a certain viscosity and fluidity, it is easy to wrap the air in the coating during the falling process, thus generating coating bubbles. The presence of bubbles may affect the heat dissipation performance of the component, thereby endangering the service life and performance stability of the component. In addition, bubbles may also destroy the integrity of the conformal coating layer, causing adverse effects on the quality and reliability of the product. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a coating system and method for triple-conformal paint, which enhances the coating quality and permeability, reduces pollution to the environment, and saves production costs. It can meet the coating requirements of different types of products, is widely used in multiple fields, improves the protective performance of the product, and effectively extends the service life of the product.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, an embodiment of the present application provides a coating system for a conformal coating, the coating system comprising: a vacuum pump, a vacuum chamber, and a spray gun;

[0007] The vacuum pump extracts air from the vacuum chamber according to the desired vacuum degree; if the vacuum chamber reaches the desired vacuum degree, the spray gun coats the target product according to the desired coating thickness.

[0008] Preferably, the coating system further comprises: a valve and a vacuum pipeline;

[0009] The vacuum pump extracts air from the vacuum chamber according to a desired vacuum degree, comprising:

[0010] If it is detected that the vacuum degree of the vacuum chamber does not reach the desired vacuum degree, the vacuum pump and the valve are opened, and the vacuum pump extracts the air in the vacuum chamber through the vacuum pipe;

[0011] If it is detected that the vacuum degree of the vacuum chamber reaches the desired vacuum degree, the vacuum pump and the valve are closed.

[0012] Preferably, the coating system further comprises: a metering pump;

[0013] If the vacuum chamber reaches the desired vacuum degree, the spray gun coats the target product according to the desired coating thickness, including:

[0014] If the vacuum chamber reaches the desired vacuum degree, the spray valve and metering pump of the spray gun are opened, and the metering pump delivers the desired amount of conformal coating to the spray gun to coat the target product until the thickness of the conformal coating coated on the surface of the target product reaches the desired coating thickness, and the spray valve and metering pump of the spray gun are closed.

[0015] Preferably, the coating system further comprises: a heating device;

[0016] The heating device dries and solidifies the coated target product according to a preset heating temperature.

[0017] Preferably, the heating device dries and solidifies the coated target product according to a preset heating temperature, comprising:

[0018] If it is detected that the current temperature of the vacuum chamber is lower than the preset heating temperature, the power supply of the heating device is increased;

[0019] If it is detected that the current temperature of the vacuum chamber is higher than the preset heating temperature, the power supply of the heating device is reduced or the power supply of the heating device is cut off;

[0020] If it is detected that the current temperature of the vacuum chamber is equal to the preset heating temperature, the vacuum chamber maintains the preset heating temperature for a preset period of time.

[0021] In a second aspect, an embodiment of the present application further provides a method for coating a conformal coating, and the coating method is applied to the coating system;

[0022] The coating method comprises:

[0023] The vacuum pump extracts air from the vacuum chamber according to the desired vacuum degree;

[0024] If the vacuum chamber reaches the desired vacuum level, the spray gun will coat the target product according to the desired coating thickness.

[0025] Preferably, the vacuum pump extracts air from the vacuum chamber according to a desired vacuum degree, comprising:

[0026] If it is detected that the vacuum degree of the vacuum chamber does not reach the desired vacuum degree, the vacuum pump and the valve are opened, and the vacuum pump extracts the air in the vacuum chamber through the vacuum pipe;

[0027] If it is detected that the vacuum degree of the vacuum chamber reaches the desired vacuum degree, the vacuum pump and the valve are closed.

[0028] Preferably, if the vacuum chamber reaches a desired vacuum degree, the spray gun coats the target product according to a desired coating thickness, including:

[0029] If the vacuum chamber reaches the desired vacuum degree, the spray valve and metering pump of the spray gun are opened, and the metering pump delivers the desired amount of conformal coating to the spray gun to coat the target product until the thickness of the conformal coating coated on the surface of the target product reaches the desired coating thickness, and the spray valve and metering pump of the spray gun are closed.

[0030] Preferably, the coating method further comprises: a heating device drying and curing the coated target product according to a preset heating temperature.

[0031] Preferably, the heating device dries and solidifies the coated target product according to a preset heating temperature, comprising:

[0032] If it is detected that the current temperature of the vacuum chamber is lower than the preset heating temperature, the power supply of the heating device is increased;

[0033] If it is detected that the current temperature of the vacuum chamber is higher than the preset heating temperature, the power supply of the heating device is reduced or the power supply of the heating device is cut off;

[0034] If it is detected that the current temperature of the vacuum chamber is equal to the preset heating temperature, the vacuum chamber maintains the preset heating temperature for a preset period of time.

[0035] The embodiment of the present application provides a coating system and method for conformal coating, in which a vacuum pump extracts air from a vacuum chamber according to a desired vacuum degree; if the vacuum chamber reaches the desired vacuum degree, the spray gun coats the target product according to the desired coating thickness. In this way, the coating quality and permeability are enhanced, the pollution to the environment is reduced, and the production cost is saved. It can meet the coating requirements of different types of products, is widely used in multiple fields, improves the protective performance of the product, and effectively extends the service life of the product.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 One of the structural schematic diagrams of a coating system of a conformal coating provided in an embodiment of the present application is shown;

[0039] Figure 2 The second structural schematic diagram of a coating system of a conformal coating provided in an embodiment of the present application is shown;

[0040] Figure 3 A flow chart of a method for coating a conformal coating provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0041] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0042] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0043] The following method or system of the embodiment of the present application can be applied to any scenario where product coating is required. The embodiment of the present application is not limited to the specific application scenario. Any scheme of the coating system and method using the triple-conformal paint provided by the embodiment of the present application is within the protection scope of this application.

[0044] In many fields such as electronic manufacturing, conformal coatings are coatings with protective functions such as moisture-proof, salt spray-proof, and mildew-proof. The coating of conformal coatings is a key process. At present, this operation is mainly completed by special conformal coating equipment. This equipment is designed to be able to realize coating and automatic detection functions. During the coating process, the entire operation is carried out in an indoor environment, that is, the coating work is carried out under standard conditions of atmospheric pressure. The coating equipment will evenly coat the conformal coating on the surface of the target object according to the set procedures and parameters. However, when the conformal coating falls from the nozzle of the coating equipment and has not yet reached the surface of the target object, it will fully contact with the surrounding air. Since the conformal coating has a certain viscosity and fluidity, it is easy to wrap air in the paint during the falling process, thereby generating coating bubbles. The presence of bubbles may affect the heat dissipation performance of the component, thereby endangering the service life and performance stability of the component. In addition, bubbles may also destroy the integrity of the conformal coating layer, causing adverse effects on the quality and reliability of the product.

[0045] Based on this, the embodiments of the present application provide a coating system and method for triple-conformal paint, which enhances the coating quality and permeability, reduces pollution to the environment, and saves production costs. It can meet the coating requirements of different types of products, is widely used in multiple fields, improves the protective performance of the product, and effectively extends the service life of the product.

[0046] To facilitate the understanding of the present application, the technical solution provided by the present application is described in detail below in conjunction with specific embodiments.

[0047] See also Figure 1 , Figure 1 This is one of the structural schematic diagrams of a conformal coating system provided in an embodiment of the present application.

[0048] like Figure 1 As shown in , the coating system provided in the embodiment of the present application includes: a vacuum pump, a vacuum chamber and a spray gun.

[0049] In an embodiment of the present application, the vacuum pump extracts air in the vacuum chamber according to a desired vacuum degree; if the vacuum chamber reaches the desired vacuum degree, the spray gun coats the target product according to a desired coating thickness.

[0050] See also Figure 2 , Figure 1 This is a second structural schematic diagram of a conformal coating system provided in an embodiment of the present application.

[0051] In a possible implementation, Figure 2 As shown in , the coating system provided in the embodiment of the present application also includes: a valve and a vacuum pipe.

[0052] In an embodiment of the present application, the vacuum chamber is located inside the coating equipment, and there is a space at the top of the coating equipment where a chamber door can be opened and closed to facilitate the placement and removal of the target product. A tray of products is placed at the bottom of the vacuum chamber, and the spray gun is installed at the top or side of the chamber through a specific bracket to ensure that the surface of the target product placed in the chamber can be covered for coating. The valve is arranged near the air inlet of the vacuum pump, and the vacuum chamber is connected to the vacuum pipe.

[0053] In a possible implementation, the coating system provided in the embodiment of the present application further includes: a controller. As an example, the controller of the present application is a programmable logic controller PLC.

[0054] If it is detected that the vacuum degree of the vacuum chamber does not reach the expected vacuum degree, the vacuum pump and the valve are opened, and the vacuum pump extracts the air in the vacuum chamber through the vacuum pipe. If it is detected that the vacuum degree of the vacuum chamber reaches the expected vacuum degree, the vacuum pump and the valve are closed. Specifically, after placing the target product in the vacuum chamber, the chamber door is closed, and the vacuum degree sensor detects the vacuum degree of the vacuum chamber and sends it to the controller. If it is detected that the vacuum degree of the vacuum chamber does not reach the expected vacuum degree, the controller controls the vacuum pump and the valve to open, and the vacuum pump extracts the air in the vacuum chamber through the vacuum pipe. The air pressure in the vacuum chamber gradually decreases. If the vacuum degree sensor detects that the vacuum degree in the chamber reaches the expected vacuum degree, the controller controls the vacuum pump and the valve to close.

[0055] Here, it is expected that the vacuum degree is adjusted according to the type of target product. As an example, fine electronic components are coated at a vacuum degree of 10-100Pa. Fine electronic components include: chips and micro sensors, etc. Fine electronic components have a precise structure and many tiny pores and gaps. High vacuum can ensure that the three-proof paint fully penetrates into the fine details, thereby forming a good protective layer, effectively preventing the components from being damaged by moisture, salt spray or mold erosion; printed circuit boards are coated at 100-500Pa. Various electronic components and circuits are distributed on the printed circuit board. There are certain pores and spaces that need to be filled with three-proof paint. Coating at 100-500Pa can ensure that the three-proof paint effectively penetrates to the bottom of the components and between the circuits, and will not cause damage to the components or displacement of the circuits due to excessive vacuuming; large electronic equipment casings are coated at a vacuum degree of 500-1000Pa. The main function of the large electronic equipment casing is to resist the influence of the external environment on the internal electronic components. The structure of the large electronic equipment casing is relatively rough, and the requirements for the penetration depth of the three-proof paint are not high.

[0056] In a possible implementation, Figure 2As shown in , the coating system provided in the embodiment of the present application further includes: a metering pump. If the vacuum chamber reaches the desired vacuum degree, the spray valve and metering pump of the spray gun are opened, and the metering pump extracts the conformal paint in the paint storage container and delivers the desired amount of conformal paint to the spray gun to coat the target product, until the thickness of the conformal paint coated on the surface of the target product reaches the desired coating thickness, the spray valve and metering pump of the spray gun are closed, and the metering pump stops delivering the conformal paint.

[0057] In a possible implementation, the coating system provided in the embodiment of the present application further includes: a paint storage container, and a metering pump extracts the conformal paint in the paint storage container.

[0058] Here, in this application, the vacuum environment enables the conformal paint to cover the surface of the target product more evenly, and the paint particles can better fill the pores and gaps of the product, avoiding defects such as bubbles and flow marks, and improving the protective performance. The nozzle of the spray gun is a fan-shaped nozzle. Specifically, the nozzle outlet is fan-shaped, which expands the spray coverage area. During spraying, the paint mist diffuses from the nozzle in a fan shape, and adjacent droplets overlap each other, so that the paint film thickness on the surface of the product is uniform. The coating thickness of the conformal paint on the product surface is monitored by a thickness gauge.

[0059] Before coating the target product, set the metering pump to deliver the conformal coating to the spray gun per unit time and the pressure of the conformal coating according to the type of the target product to ensure that the paint delivery process from the metering pump to the spray gun is stable, so that the amount of paint sprayed by the spray gun per unit time remains constant to prevent excessive or insufficient paint in some areas.

[0060] In a possible implementation, Figure 2 As shown in , the coating system provided in the embodiment of the present application also includes: a heating device. The heating device dries and solidifies the coated target product according to a preset heating temperature. If it is detected that the current temperature of the vacuum chamber is lower than the preset heating temperature, the power supply of the heating device is increased; if it is detected that the current temperature of the vacuum chamber is higher than the preset heating temperature, the power supply of the heating device is reduced or the power supply of the heating device is cut off; if it is detected that the current temperature of the vacuum chamber is equal to the preset heating temperature, the vacuum chamber maintains the preset heating temperature for a preset period of time.

[0061] Here, the heating device may be a heating device or a heating plate. A temperature sensor for obtaining the temperature of the vacuum chamber in real time is arranged near the heating device or in the area where the target product is placed. The temperature sensor may be a thermocouple sensor or a thermal resistor sensor.

[0062] Specifically, after receiving the signal from the temperature sensor, the controller compares the current temperature of the vacuum chamber with the preset heating temperature. If the temperature of the front vacuum chamber is lower than the preset heating temperature, the power supply to the heating device is increased so that the heating device generates more heat to increase the temperature; if the current temperature of the vacuum chamber is higher than the preset heating temperature, the power supply will be reduced or the power will be temporarily cut off to reduce heat generation and cause the temperature to drop. For example, the preset heating temperature is 60°C. When the temperature sensor detects that the current temperature is 50°C, the controller will increase the power of the heating device to push the temperature up; when the temperature reaches 60°C, the controller will adjust the power to maintain the temperature, thereby ensuring the accuracy of the heating process. The heating device can speed up the drying speed of the three-proof paint and improve production efficiency.

[0063] In a possible implementation, Figure 2 As shown, the coating system provided in the embodiment of the present application may also include a touch screen.

[0064] Here, the user can set parameters such as vacuum degree, coating thickness, heating temperature, etc. on the touch screen. For example, when coating delicate electronic components, a higher vacuum degree, such as 50Pa, can be set on the touch screen.

[0065] In this application, the system has two operating modes: manual and automatic. In manual mode, the operator can independently control the start and stop of components such as the vacuum pump and the heating device, which is conducive to the debugging of the equipment and troubleshooting. In automatic mode, the equipment will automatically perform the coating process according to the pre-set program and parameters.

[0066] The following is a specific example to illustrate the coating process of three-conformal coating:

[0067] First, check the conformal coating vacuum coating equipment. Check whether the sealing strip of the vacuum chamber is damaged to ensure the chamber is well sealed; test whether the vacuum pump can pump air normally and smoothly and reach the specified vacuum degree; calibrate the metering pump to ensure that it can accurately supply the paint liquid; debug the spray gun to ensure that the sprayed paint mist is evenly atomized; and check whether the heating tube, controller and touch screen are in normal working condition.

[0068] Then, assuming that the printed circuit board (PCB) board is to be coated, the PCB board is placed steadily on the tray in the vacuum chamber, and then the chamber door is closed. The operator clicks the "vacuum" button on the touch screen, and the vacuum pump starts and performs air extraction through the vacuum pipeline. After 3 minutes, the air pressure in the chamber is reduced to the expected value of 300Pa, reaching a vacuum environment suitable for PCB board coating.

[0069] Then, when the vacuum environment reaches the expected value, the metering pump outputs paint liquid to the spray gun according to the desired amount of paint. The operator starts the spray gun by operating the touch screen, and the fan-shaped nozzle of the spray gun evenly sprays paint mist, covering the PCB board.

[0070] Secondly, after the coating operation is completed, the heating tube is turned on and the temperature in the chamber is raised to 60°C to accelerate the drying and curing process of the three-conformal coating. This process takes about 15 minutes to complete. During the heating process, the temperature sensor feeds back the temperature information in real time, and the controller accurately controls the temperature based on the feedback information.

[0071] Finally, after curing is completed, the chamber door is opened to take out the PCB board. The quality inspector uses a film thickness meter to measure the thickness of the paint layer and visually checks whether there are bubbles and flow marks. At the same time, sampling is carried out to test the PCB board for moisture and salt spray resistance. If the test results are qualified, the PCB board flows into the next production link; if not, the cause is analyzed and the parameter value is adjusted before re-coating.

[0072] The embodiment of the present application provides a coating system for a conformal coating. Through the system, the coating quality and permeability are enhanced, the pollution to the environment is reduced, and the production cost is saved. The system can meet the coating requirements of different types of products, is widely used in multiple fields, improves the protective performance of the products, and effectively extends the service life of the products.

[0073] Based on the same application concept, the embodiments of the present application also provide a method for coating a conformal coating corresponding to the conformal coating system provided in the above embodiments. Since the principle of solving the problem by the method in the embodiments of the present application is similar to that of the conformal coating system in the above embodiments of the present application, the implementation of the method can refer to the implementation of the system, and the repeated parts will not be repeated.

[0074] See also Figure 3 , Figure 3 A flow chart of a method for coating a conformal coating provided in an embodiment of the present application.

[0075] like Figure 3 As shown in , the coating method provided in the embodiment of the present application is applied to a coating system, and the coating method includes:

[0076] In step S301 , a vacuum pump extracts air from a vacuum chamber according to a desired vacuum degree.

[0077] Preferably, regarding step S301, in specific implementation, as an example, the following steps may be included:

[0078] If it is detected that the vacuum degree of the vacuum chamber does not reach the expected vacuum degree, the vacuum pump and the valve are opened, and the vacuum pump extracts air in the vacuum chamber through the vacuum pipe; if it is detected that the vacuum degree of the vacuum chamber reaches the expected vacuum degree, the vacuum pump and the valve are closed.

[0079] Step S302: If the vacuum chamber reaches the desired vacuum level, the spray gun coats the target product according to the desired coating thickness.

[0080] Preferably, regarding step S302, in the specific implementation, as an example, the following steps may be included: if the vacuum chamber reaches the desired vacuum degree, the spray valve and the metering pump of the spray gun are opened, and the metering pump delivers the desired amount of conformal paint to the spray gun to coat the target product until the thickness of the conformal paint coated on the surface of the target product reaches the desired coating thickness, and the spray valve and the metering pump of the spray gun are closed.

[0081] Preferably, the coating method further comprises: a heating device drying and curing the coated target product according to a preset heating temperature.

[0082] Preferably, if it is detected that the current temperature of the vacuum chamber is lower than the preset heating temperature, the power supply of the heating device is increased; if it is detected that the current temperature of the vacuum chamber is higher than the preset heating temperature, the power supply of the heating device is reduced or the power supply of the heating device is cut off; if it is detected that the current temperature of the vacuum chamber is equal to the preset heating temperature, the vacuum chamber maintains the preset heating temperature for a preset time period.

[0083] The embodiment of the present application provides a method for coating a conformal coating. Through the method, the coating quality and permeability are enhanced, the pollution to the environment is reduced, and the production cost is saved. The method can meet the coating requirements of different types of products, is widely used in multiple fields, improves the protective performance of the product, and effectively extends the service life of the product.

[0084] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0085] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0086] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0087] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0088] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A coating system for conformal coating, characterized in that: The coating system comprises: a vacuum pump, a vacuum chamber and a spray gun; The vacuum pump extracts air from the vacuum chamber according to the desired vacuum degree; if the vacuum chamber reaches the desired vacuum degree, the spray gun coats the target product according to the desired coating thickness.

2. The coating system according to claim 1, characterized in that: The coating system also includes: a valve and a vacuum pipeline; The vacuum pump extracts air from the vacuum chamber according to a desired vacuum degree, comprising: If it is detected that the vacuum degree of the vacuum chamber does not reach the desired vacuum degree, the vacuum pump and the valve are opened, and the vacuum pump extracts the air in the vacuum chamber through the vacuum pipe; If it is detected that the vacuum degree of the vacuum chamber reaches the desired vacuum degree, the vacuum pump and the valve are closed.

3. The coating system according to claim 1, characterized in that: The coating system further comprises: a metering pump; If the vacuum chamber reaches the desired vacuum degree, the spray gun coats the target product according to the desired coating thickness, including: If the vacuum chamber reaches the desired vacuum degree, the spray valve and metering pump of the spray gun are opened, and the metering pump delivers the desired amount of conformal coating to the spray gun to coat the target product until the thickness of the conformal coating coated on the surface of the target product reaches the desired coating thickness, and the spray valve and metering pump of the spray gun are closed.

4. The coating system according to claim 1, characterized in that: The coating system further comprises: a heating device; The heating device dries and solidifies the coated target product according to a preset heating temperature.

5. The coating system according to claim 4, characterized in that: The heating device dries and solidifies the coated target product according to a preset heating temperature, including: If it is detected that the current temperature of the vacuum chamber is lower than the preset heating temperature, the power supply of the heating device is increased; If it is detected that the current temperature of the vacuum chamber is higher than the preset heating temperature, the power supply of the heating device is reduced or the power supply of the heating device is cut off; If it is detected that the current temperature of the vacuum chamber is equal to the preset heating temperature, the vacuum chamber maintains the preset heating temperature for a preset period of time.

6. A method for coating a conformal coating, characterized in that: The coating method is applied to the coating system according to any one of claims 1 to 5; The coating method comprises: The vacuum pump extracts air from the vacuum chamber according to the desired vacuum degree; If the vacuum chamber reaches the desired vacuum level, the spray gun will coat the target product according to the desired coating thickness.

7. The coating method according to claim 6, characterized in that: The vacuum pump extracts air from the vacuum chamber according to a desired vacuum degree, comprising: If it is detected that the vacuum degree of the vacuum chamber does not reach the desired vacuum degree, the vacuum pump and the valve are opened, and the vacuum pump extracts the air in the vacuum chamber through the vacuum pipe; If it is detected that the vacuum degree of the vacuum chamber reaches the desired vacuum degree, the vacuum pump and the valve are closed.

8. The coating method according to claim 6, characterized in that: If the vacuum chamber reaches the desired vacuum degree, the spray gun coats the target product according to the desired coating thickness, including: If the vacuum chamber reaches the desired vacuum degree, the spray valve and metering pump of the spray gun are opened, and the metering pump delivers the desired amount of conformal coating to the spray gun to coat the target product until the thickness of the conformal coating coated on the surface of the target product reaches the desired coating thickness, and the spray valve and metering pump of the spray gun are closed.

9. The coating method according to claim 6, characterized in that: The coating method further comprises: a heating device drying and curing the coated target product according to a preset heating temperature.

10. The coating method according to claim 9, characterized in that: The heating device dries and solidifies the coated target product according to a preset heating temperature, including: If it is detected that the current temperature of the vacuum chamber is lower than the preset heating temperature, the power supply of the heating device is increased; If it is detected that the current temperature of the vacuum chamber is higher than the preset heating temperature, the power supply of the heating device is reduced or the power supply of the heating device is cut off; If it is detected that the current temperature of the vacuum chamber is equal to the preset heating temperature, the vacuum chamber maintains the preset heating temperature for a preset period of time.

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