Workpiece vacuum laminating device and method

Abstract

The invention discloses a workpiece vacuum film coating device and method. The device comprises a workbench, a sealing cover, a first heating device, a vacuumizing device, a valve device, a clamp, a lifting device, a film frame, a sealing piece, a heat storage pressure tank and a second heating device. The method comprises the following steps: fixing the diaphragm and sealing the periphery; placing a workpiece; the sealing cover covers and is combined with the heating membrane; vacuumizing is conducted; the lifting device moves the film frame downwards to be attached to the workpiece, and a closed cavity is formed; the valve device pumps hot fluid heated by the heat storage pressure tank into the sealing cover, and pressure difference is generated so that the membrane can be evenly and tightly attached to the workpiece. The internal circulation mechanism is started to impact the diaphragm, so that the temperature uniformity and the adhesion degree are improved; the hot fluid is recovered through pressure relief; opening the cover and taking out the workpiece. Gas fluid and liquid fluid are compatible, the fluid is heated in advance through the heat storage pressure tank, the film is prevented from being cooled in the pressurization process, and the film covering quality and the machining efficiency are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of film covering, and particularly relates to a workpiece vacuum film covering device and method. BACKGROUND

[0002] The vacuum film covering machine evacuates the air between the film and the workpiece in a closed chamber to avoid air bubbles during film covering, thereby improving the quality of finished products. However, when the film surface has complex textures, such as high-end decorative films with three-dimensional embossing, micro-nano grooves, deep cavity reverse buckling or dense textures, and the glue must be cured at high temperature and high pressure for a long period of time, greater pressure and sufficient temperature must be applied to the film to make the film completely adhere to the workpiece. However, the existing vacuum film covering machine cannot handle such high-texture films. SUMMARY

[0003] The application aims to provide a workpiece vacuum film covering device and method to solve the problems in the background.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: a workpiece vacuum film covering device, comprising a workbench, the workbench is sealingly connected with a sealing cover, the sealing cover is fixedly installed with a first heating device, the sealing cover or the workbench is fixedly connected with a vacuumizing device and a valve device, the workbench is fixedly installed with a clamp, the workbench is fixedly installed with a lifting device, the lifting device is fixedly installed with a film rack, the workbench and below the film rack are fixedly installed with a sealing element, the valve device is fixedly connected with a heat storage pressure tank, and the heat storage pressure tank is fixedly installed with a second heating device.

[0005] Preferably, the heat storage pressure tank is fixedly connected with a heat storage temporary storage tank through a pressure pump, the heat storage temporary storage tank is fixedly connected with a recovery valve, and the recovery valve is fixedly connected with the workbench or the sealing cover.

[0006] Preferably, the heat storage temporary storage tank is fixedly installed with a third heating device.

[0007] Preferably, the sealing cover is fixedly installed with an extension mechanism, the extension mechanism is fixedly installed with a fourth heating device, and the fourth heating device comprises an upper heating assembly and a lower heating assembly.

[0008] Preferably, the upper heating assembly is fixedly installed with a first temperature probe, and the lower heating assembly is fixedly installed with a second temperature probe.

[0009] Preferably, the sealing cover is fixedly installed with an internal circulation mechanism, the exhaust port of the internal circulation mechanism is in communication with the inside of the sealing cover, and the suction port of the internal circulation mechanism is in communication with the end face of the workbench.

[0010] Preferably, a third temperature detecting device is fixedly installed in the sealing cover.

[0011] Preferably, a pressure injection device is fixedly connected to the sealing cover or the workbench.

[0012] Preferably, a first safety pressure relief valve is fixedly installed in the sealing cover or the workbench.

[0013] Preferably, a safety pressure relief valve is fixedly installed in the heat storage pressure tank.

[0014] A workpiece vacuum film coating method comprises the following steps:

[0015] S1: fixing a film sheet on the film frame, and sealingly connecting the periphery of the film sheet to the film frame;

[0016] S2: placing a workpiece on the workbench;

[0017] S3: sealingly covering the sealing cover on the workbench, starting the first heating device, and heating the film sheet;

[0018] S4: starting the vacuum pump, and pumping air out of the sealing cover;

[0019] S5: starting the lifting device, moving the film frame downward, and making the film sheet adhere to the surface of the workpiece; the film frame is sealingly connected to the sealing cover, so that a closed cavity is formed between the film sheet, the film frame and the workbench, and the workpiece is located in the closed cavity;

[0020] S6: starting the valve device, pumping hot fluid into the sealing cover, making the film sheet have a pressure difference on both sides, and making the film sheet sufficiently adhere to the surface of the workpiece;

[0021] S7: starting the internal circulation mechanism, and making the hot fluid impact the film sheet, so as to further improve the uniformity and adhesion of the film sheet and the surface of the workpiece;

[0022] S8: opening the recovery valve, and discharging the hot fluid in the sealing cover into the heat storage temporary tank; when the pressure in the sealing cover is equal to the outside, the recovery valve is closed;

[0023] S9: discharging the pressure of the closed cavity, and then opening the sealing cover, and taking out the workpiece coated with the film.

[0024] Preferably, the S3 further comprises: starting the fourth heating device, moving the fourth heating device between the film sheet and the workpiece, and synchronously heating the glue under the film sheet and preheating the workpiece.

[0025] Compared with the prior art, the method has the following beneficial effects:

[0026] The workbench of the present application is sealedly connected with the sealing cover, the workbench is fixedly installed with the lifting device, the lifting device drives the membrane frame to move up and down, the membrane frame fixes the periphery of the sealing film, in operation, the first heating device heats the film, the film is softened and the glue at the bottom is melted, the vacuumizing device extracts the air in the sealing cover, the vacuumizing operation is completed, the lifting device drives the membrane frame to move down, the film is contacted with the surface of the workpiece, at the same time, the membrane frame is sealedly connected with the sealing element, the film-membrane frame-workbench forms a closed chamber, the closed chamber is also in vacuum state, at this time, the valve device extracts the heat fluid in the heat storage pressure tank and pumps into the sealing cover, the pressure in the sealing cover is increased, because the film separates the space of the sealing cover from the closed chamber, and the closed chamber is also in vacuum state, the pressure in the sealing cover acts on the surface of the film, the film has uniform strong force to adhere to the workpiece, the film coating quality of the workpiece is improved.

[0027] The present application is compatible with both gas and liquid fluids, liquid fluids support greater pressure and higher temperatures.

[0028] The valve device of the present application pumps heat fluid, prevents the film from cooling in the pressurizing process, improves the film coating quality of the workpiece, and improves the overall processing efficiency by preheating the fluid in the heat storage pressure tank. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the schematic diagram of the opening state of the sealing cover of the present application.

[0030] Figure 2 is the schematic diagram of the film heating stage of the present application.

[0031] Figure 3 is the schematic diagram of the workpiece film coating stage of the present application.

[0032] In the figure, the annotations are: workbench 1, sealing cover 2, first heating device 3, vacuumizing device 4, valve device 5, clamp 6, lifting device 7, membrane frame 8, sealing element 9, heat storage pressure tank 10, second heating device 11, pressure pump 12, heat storage temporary tank 13, recovery valve 14, third heating device 15, telescopic mechanism 16, fourth heating device 17, upper heating assembly 18, lower heating assembly 19, first temperature sensing device 20, second temperature sensing device 21, internal circulation mechanism 22, third temperature sensing device 23, pressure injection device 24, first safety pressure relief valve 25, second safety pressure relief valve 26. DETAILED DESCRIPTION

[0033] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

[0034] Embodiment one:

[0035] The workpiece vacuum film coating device provided by the application comprises a workbench 1, a sealing cover 2 is sealingly connected to the workbench 1, a first heating device 3 is fixedly installed in the sealing cover 2, the sealing cover 2 or the workbench 1 is fixedly connected with a vacuumizing device 4 and a valve device 5, the workbench 1 is fixedly installed with a clamp 6, the workbench 1 is fixedly installed with a lifting device 7, the lifting device 7 is fixedly installed with a film rack 8, the workbench 1 and located below the film rack 8 is fixedly installed with a sealing element 9, the valve device 5 is fixedly connected with a heat storage pressure tank 10, the heat storage pressure tank 10 is fixedly installed with a second heating device 11. The heat storage pressure tank 10 is fixedly connected with a heat storage temporary storage tank 13 through a pressure pump 12, the heat storage temporary storage tank 13 is fixedly connected with a recovery valve 14, the recovery valve 14 is fixedly connected with the workbench 1 or the sealing cover 2. The heat storage temporary storage tank 13 is fixedly installed with a third heating device 15. The sealing cover 2 is fixedly installed with an extension mechanism 16, the extension mechanism 16 is fixedly installed with a fourth heating device 17, the fourth heating device 17 comprises an upper heating assembly 18 and a lower heating assembly 19. The upper heating assembly 18 is fixedly installed with a first temperature sensing device 20, and the lower heating assembly 19 is fixedly installed with a second temperature sensing device 21. The sealing cover 2 is fixedly installed with an internal circulation mechanism 22, the exhaust port of the internal circulation mechanism 22 is communicated with the inside of the sealing cover 2, and the suction port of the internal circulation mechanism 22 is communicated with the end surface of the workbench 1. The sealing cover 2 is fixedly installed with a third temperature sensing device 23. The sealing cover 2 or the workbench 1 is fixedly connected with a pressure injection device 24. The sealing cover 2 or the workbench 1 is fixedly installed with a first safety pressure relief valve 25. The heat storage pressure tank 10 is fixedly installed with a second safety pressure relief valve 26.

[0036] A workpiece vacuum film covering method, comprising: S1: fixing a film on a film frame 8, the periphery of the film being sealingly connected with the film frame 8; S2: placing a workpiece on a workbench 1; S3: sealingly covering a sealing cover 2 with the workbench 1, starting a first heating device 3 to heat the film; S4: starting a vacuumizing device 4 to exhaust air in the sealing cover 2; S5: starting a lifting device 7 to move the film frame 8 downward, so that the film is attached to the surface of the workpiece, the film frame 8 is sealingly connected with a sealing element 9, and a closed cavity is formed between the film, the film frame 8 and the workbench 1, and the workpiece is located in the closed cavity; S6: starting a valve device 5 to pump hot fluid into the sealing cover 2, so that a pressure difference is generated on both sides of the film, and the film is fully attached to the surface of the workpiece; S7: starting an internal circulation mechanism 22 to make the hot fluid impact the film, so as to further improve the uniformity and tightness of the film and the surface of the workpiece; S8: opening a recovery valve 14 to exhaust the hot fluid in the sealing cover 2 into a heat storage temporary tank 13, and when the pressure in the sealing cover 2 is equal to that outside, the recovery valve 14 is closed; S9: exhausting the pressure in the closed cavity, and then opening the sealing cover 2 to take out the workpiece after film covering. S3 further comprises: starting a fourth heating device 17, and moving the fourth heating device 17 between the film and the workpiece to synchronously heat the glue under the film and preheat the workpiece.

[0037] Through the above technical solution, the workbench 1 is sealingly connected with the sealing cover 2, the workbench 1 is fixedly installed with the lifting device 7, the lifting device 7 drives the film frame 8 to move up and down, the film frame 8 fixes the periphery of the film, in operation, the first heating device 3 heats the film to soften the film and melt the glue at the bottom, the vacuumizing device 4 exhausts the air in the sealing cover 2 to complete the vacuumizing operation, the lifting device 7 drives the film frame 8 to move downward, so that the film is in contact with the surface of the workpiece, at the same time, the film frame 8 is sealingly connected with the sealing element 9, so that the film, the film frame 8 and the workbench 1 form a closed cavity, and the closed cavity is also in a vacuum state, at this time, the valve device 5 pumps the hot fluid in the heat storage pressure tank 10 into the sealing cover 2 to increase the pressure in the sealing cover 2, because the film separates the space of the sealing cover 2 from the closed cavity, and the closed cavity is also in a vacuum state, the pressure in the sealing cover 2 acts on the surface of the film, so that the film has uniform force to attach to the workpiece, and the workpiece film covering quality is improved.

[0038] The application is compatible with both gas and liquid fluids, and the liquid fluid supports greater pressure and higher temperature.

[0039] The valve device 5 pumps the hot fluid to prevent the film from cooling during the pressurizing process, improve the workpiece film covering quality, and preheat the fluid in the heat storage pressure tank 10 to improve the overall processing efficiency.

[0040] Embodiment two:

[0041] The workbench 1 of the embodiment is sealingly connected with the sealing cover 2, the first heating device 3 is fixedly installed in the sealing cover 2, the sealing cover 2 or the workbench 1 is fixedly connected with the vacuumizing device 4 and the valve device 5, the workbench 1 is fixedly installed with the clamp 6 for fixing the workpiece. The workbench 1 is fixedly installed with the lifting device 7, the lifting device 7 is fixedly installed with the film frame 8 for fixing the periphery of the sealing film. The workbench 1 and the film frame 8 below are fixedly installed with the sealing element 9 for forming sealing connection with the film frame 8. The valve device 5 is fixedly connected with the heat storage pressure tank 10, the heat storage pressure tank 10 is fixedly installed with the second heating device 11 for heating and heat preservation of the fluid in the heat storage pressure tank 10.

[0042] In the running process, the first heating device 3 heats the film to soften the film and melt the glue at the bottom, facilitating subsequent lamination. The vacuumizing device 4 is started to extract air in the sealing cover 2 to form a vacuum environment to avoid air bubbles during film covering. The lifting device 7 drives the film frame 8 to move downward to make the film contact with the surface of the workpiece, and at the same time, the film frame 8 is sealingly connected with the sealing element 9 to form a closed chamber which also maintains a vacuum state. The valve device 5 extracts hot fluid from the heat storage pressure tank 10 and pumps it into the sealing cover 2 to increase the pressure in the sealing cover 2. Since the film separates the space of the sealing cover 2 from the closed chamber, and the closed chamber is in a vacuum state, the pressure in the sealing cover 2 uniformly acts on the surface of the film to provide strong force to make the film completely adhere to the workpiece. It is especially suitable for high-end decorative films with complex surface textures, such as films with three-dimensional embossing, micro-nano level grooves, deep cavity reverse buckling or dense texture, as well as glues that must be cured at high temperature and high pressure for a long period of time. Greater pressure and sufficient temperature must be applied to the film to ensure high film covering quality without air bubbles or wrinkles.

[0043] The fluid in the heat storage pressure tank 10 is heated and heat preserved by the second heating device 11 to ensure that the fluid maintains an appropriate temperature during the pressurization process, preventing the film from cooling during pressurization and affecting the adhesive bonding effect. This device is compatible with both gas and liquid fluids, and liquid fluids can provide greater pressure and higher temperature, making it suitable for high-demand film covering operations. By heating and heat preserving the fluid in advance, the overall processing efficiency is improved, the production cycle is reduced, and the consistency and reliability of the film covering are ensured. This embodiment combines vacuum, heating, pressurization and sealing technologies to achieve high-quality film covering of complex texture films and glues that must be cured at high temperature and high pressure for a long period of time, and greater pressure and sufficient temperature must be applied to the film. It is suitable for high-end decoration and precision manufacturing fields.

[0044] Embodiment three:

[0045] The workbench 1 of the embodiment is sealingly connected with a sealing cover 2, the first heating device 3 is fixedly installed in the sealing cover 2, the sealing cover 2 or the workbench 1 is fixedly connected with the vacuumizing device 4 and the valve device 5, the workbench 1 is fixedly installed with the clamp 6, the workbench 1 is fixedly installed with the lifting device 7, the lifting device 7 is fixedly installed with the film frame 8, the workbench 1 and located below the film frame 8 is fixedly installed with the sealing element 9, the valve device 5 is fixedly connected with the heat storage pressure tank 10, the heat storage pressure tank 10 is fixedly installed with the second heating device 11, the second heating device 11 is used for heating and heat preservation of the fluid in the heat storage pressure tank 10, the heat storage pressure tank 10 is fixedly connected with the heat storage temporary storage tank 13 through the pressure pump 12, the heat storage temporary storage tank 13 is fixedly connected with the recovery valve 14, and the recovery valve 14 is fixedly connected with the workbench 1 or the sealing cover 2.

[0046] In the process of vacuum film covering of the workpiece, first, the workpiece is placed on the clamp 6 of the workbench 1, the film is fixed on the film frame 8, the sealing cover 2 is sealingly connected with the workbench 1 to form a closed space. The first heating device 3 is started to soften the film and melt the glue on the film to improve the adhesion. The vacuumizing device 4 starts to work to extract the air in the sealing cover 2 to form a vacuum environment to avoid air bubbles during film covering. The lifting device 7 drives the film frame 8 to move downward to make the film contact with the surface of the workpiece, and the film frame 8 is sealingly connected with the sealing element 9 to form a film-film frame 8-workbench 1 closed chamber, which also maintains a vacuum state. The valve device 5 extracts the hot fluid heated and heat preserved by the second heating device 11 from the heat storage pressure tank 10 and pumps it into the sealing cover 2 through the pipeline to increase the pressure in the sealing cover 2. Because the film separates the space of the sealing cover 2 from the closed chamber, and the closed chamber is in a vacuum state, the high-pressure hot fluid in the sealing cover 2 will uniformly act on the surface of the film to exert a strong pressure to make the film tightly adhere to the workpiece. Especially for high-end decorative films with complex surface textures such as three-dimensional embossing, micro-nano level grooves, deep cavity reverse buckling or dense textures, and glue that must be cured at high temperature and high pressure for a long period of time, greater pressure and sufficient temperature must be applied to the film to ensure complete adhesion and improve the quality of film covering and the consistency of finished products. The use of hot fluid prevents the film from cooling during the pressurization process, maintains the activity of the glue, and further improves the adhesion effect.

[0047] After the coating is completed, the sealed cover 2 needs to be opened to take out the workpiece. Before opening the sealed cover 2, the recovery valve 14 is operated to be opened, and the high-temperature heat fluid in the sealed cover 2 quickly flows into the heat storage temporary storage tank 13 through the recovery valve 14. This process utilizes the pressure difference and the fluidity of the fluid to achieve rapid transfer of the heat fluid, reduce the residual pressure in the sealed cover 2, thereby significantly improving the opening speed of the sealed cover 2, avoiding difficulty or delay in opening due to excessive internal pressure. After the heat fluid is recovered, the pressure pump 12 is started to pump the heat fluid in the heat storage temporary storage tank 13 back to the heat storage pressure tank 10. The second heating device 11 of the heat storage pressure tank 10 continues to heat and keep the fluid warm, ensuring that the fluid remains at a high temperature, facilitating direct use in the next processing. This recovery mechanism effectively reduces the processing energy consumption, as there is no need to heat fresh fluid every time, but to reuse the already heated fluid, saving energy costs. At the same time, the recovered high-temperature heat fluid is directly used for subsequent processing, improving the overall efficiency and reducing the preparation time, making the device more suitable for continuous or batch production scenarios. The entire embodiment realizes the efficient recycling of heat fluid through the cooperative work of the heat storage pressure tank 10, the heat storage temporary storage tank 13, the recovery valve 14 and the pressure pump 12, optimizing the energy consumption and operation convenience of the workpiece vacuum coating process.

[0048] Embodiment four:

[0049] The heat storage temporary storage tank 13 of the embodiment is fixedly installed with a third heating device 15, which is used to heat and keep the fluid in the heat storage temporary storage tank 13 warm.

[0050] The workbench 1 is sealingly connected with a sealed cover 2, the sealed cover 2 is fixedly installed with a first heating device 3, the sealed cover 2 or the workbench 1 is fixedly connected with a vacuumizing device 4 and a valve device 5, the workbench 1 is fixedly installed with a clamp 6, the workbench 1 is fixedly installed with a lifting device 7, the lifting device 7 is fixedly installed with a film rack 8, the workbench 1 and located below the film rack 8 is fixedly installed with a sealing element 9, the valve device 5 is fixedly connected with a heat storage pressure tank 10, the heat storage pressure tank 10 is fixedly installed with a second heating device 11, the second heating device 11 is used to heat and keep the fluid in the heat storage pressure tank 10 warm, the heat storage pressure tank 10 is fixedly connected with a heat storage temporary storage tank 13 through a pressure pump 12, the heat storage temporary storage tank 13 is fixedly connected with a recovery valve 14, the recovery valve 14 is fixedly connected with the workbench 1 or the sealed cover 2, before opening the sealed cover 2, the heat fluid in the sealed cover 2 is quickly injected into the heat storage temporary storage tank 13 by opening the recovery valve 14, improving the opening speed of the sealed cover 2, and then the heat fluid in the heat storage temporary storage tank 13 is pumped into the heat storage pressure tank 10 by the pressure pump 12, recovering the high-temperature heat fluid, reducing the processing energy consumption, and at the same time improving the efficiency of the next processing, the heat storage temporary storage tank 13 is fixedly installed with a third heating device 15, which is used to heat and keep the fluid in the heat storage temporary storage tank 13 warm.

[0051] In this embodiment, the third heating device 15 is integrated into the outer wall or interior of the heat storage temporary tank 13, and is implemented by an electric heating element or a fluid circulation system. When the hot fluid is quickly injected from the sealed cover 2 into the heat storage temporary tank 13 through the recovery valve 14, the third heating device 15 is immediately started to continuously heat and keep the temperature of the inflowing fluid, preventing the temperature of the fluid from dropping due to heat loss during the temporary storage process, thereby maintaining the high temperature state of the fluid. This ensures that the fluid is still at a suitable high temperature when the pressure pump 12 pumps the fluid from the heat storage temporary tank 13 back to the heat storage pressure tank 10, significantly reducing energy consumption and improving the efficiency of the overall device. During the coating process, the valve device 5 extracts hot fluid from the heat storage pressure tank 10 and pumps it into the sealed cover 2 to increase the pressure in the sealed cover 2, causing the film sheet to uniformly adhere to the workpiece. Since the fluid is kept warm by the third heating device 15 in the heat storage temporary tank 13, the thermal stability of the fluid is guaranteed, avoiding the negative effects of temperature fluctuations on film sheet heating and glue melting, thereby improving the coating quality. This is especially suitable for high-end film sheets with complex surface textures, as well as glues that require high temperature and high pressure and long-term curing, which must be subjected to greater pressure and sufficient temperature on the film sheet.

[0052] The working principle of this embodiment is based on the efficient recovery and recycling of hot fluid. After the coating operation is completed, the sealed cover 2 is still filled with hot fluid. By opening the recovery valve 14, these fluids will quickly flow into the heat storage temporary tank 13. The third heating device 15 maintains the temperature of the fluid during this process to prevent cooling. Subsequently, the pressure pump 12 transfers the hot fluid in the temporary tank back to the heat storage pressure tank 10, and the second heating device 11 can assist in the final temperature adjustment to ensure that the fluid is ready for the next processing. This design not only accelerates the opening speed of the sealed cover 2 and reduces the production interval time, but also reduces energy consumption through heat recovery. The role of the third heating device 15 is critical as it ensures that the fluid does not lose heat during the temporary storage stage, thereby maintaining the thermal efficiency of the entire system. For processing high-texture film sheets such as three-dimensional relief or micro-nano level groove film sheets, this device provides a stable high-temperature and high-pressure environment to ensure that the film sheet and glue completely adhere to the workpiece without air bubbles, improving the quality of the finished product.

[0053] This embodiment of the device is compatible with gas and liquid fluids. Liquid fluids support greater pressure and higher temperature output, making it suitable for demanding application scenarios. Through the integration of the third heating device 15, the device achieves closed-loop thermal management of the fluid, optimizing energy utilization and improving the reliability and consistency of the coating process.

[0054] Embodiment Five:

[0055] The sealing cover 2 of the embodiment is fixedly installed with a telescopic mechanism 16, the telescopic mechanism 16 is fixedly installed with a fourth heating device 17, the fourth heating device 17 includes an upper heating assembly 18 and a lower heating assembly 19. In order to improve the processing efficiency and the film quality, the fourth heating device 17 is driven to stretch and retract by the telescopic mechanism 16, the glue at the bottom of the film is heated, and the workpiece temperature is preheated, so that the processing efficiency is improved and the film quality is improved.

[0056] In one embodiment, the telescopic mechanism 16 is fixedly installed inside the sealing cover 2, the telescopic mechanism 16 adopts electric power, oil pressure, pneumatic power, etc., and realizes linear telescopic movement through different mechanical driving mechanisms such as guide rails, guide rods, gears, racks, screw nuts, transmission belts, pulleys, etc. The fixed end of the telescopic mechanism 16 is firmly installed on the inner wall of the sealing cover 2 by bolt connection, so as to ensure stability in vacuum and pressurized environment. The telescopic end of the telescopic mechanism 16 is arranged horizontally, and the end thereof is fixedly connected with the mounting frame of the fourth heating device 17 through a flange plate. The fourth heating device 17 includes an upper heating assembly 18 and a lower heating assembly 19, both of which adopt radiation and conduction heating, and the heating temperature is independently controlled by an external temperature control system, and the temperature adjustment range is between 50 degrees Celsius and 500 degrees Celsius. A gap is left between the upper heating assembly 18 and the lower heating assembly 19, which allows the film to be evenly heated during heating, and prevents the film from being damaged due to direct contact.

[0057] The embodiment realizes precise positioning and heating of the fourth heating device 17 through the telescopic mechanism 16, ensures uniform melting of the glue of the film and effective preheating of the workpiece, and significantly improves the film quality and processing efficiency, and is particularly suitable for complex film coating requirements of high-texture films, and glue that must be cured at high temperature and high pressure and for a long period of time, and films that must be subjected to greater pressure and sufficient temperature action.

[0058] Embodiment six:

[0059] The upper heating assembly 18 of the embodiment is fixedly installed with a first temperature probe 20, and the lower heating assembly 19 is fixedly installed with a second temperature probe 21. The temperature probe is a thermocouple or an infrared sensor, which detects the temperature of the workpiece or the film, accurately controls the power of the heating assembly, prevents the temperature from being too low or too high, and improves the film quality.

[0060] In the workpiece vacuum film coating device, the upper heating assembly 18 and the lower heating assembly 19 are respectively fixedly installed with the first temperature probe 20 and the second temperature probe 21. These temperature probes are used to monitor the temperature of the workpiece or the film in real time, and dynamically adjust the power output of the corresponding heating assembly according to the monitoring results, so as to ensure that the temperature is maintained within the preset range, and avoid the decline of the film quality caused by temperature fluctuation. In addition, the integration of the temperature probe improves the automation and reliability of the device. Users can set temperature parameters through the control interface, and the system automatically executes adjustment without manual intervention. This not only improves the film coating efficiency, but also ensures the consistency of repeated processing, especially suitable for complex applications of high-texture films such as three-dimensional relief or micro-nano groove films, and glues that must be cured by high temperature and high pressure and long cycle, which must be subjected to greater pressure and sufficient temperature on the film. Temperature control is crucial to the quality and detail reproduction of the film. By preventing the temperature from being too low, it avoids the poor fit caused by insufficient melting of the glue; by preventing the temperature from being too high, it avoids the glue flowing too much or the film deforming, thereby improving the yield and quality of the workpiece film coating as a whole.

[0061] Embodiment seven:

[0062] The workbench 1 of the embodiment is sealingly connected with a sealing cover 2, the sealing cover 2 is fixedly installed with a first heating device 3, the sealing cover 2 or the workbench 1 is fixedly connected with a vacuum pumping device 4 and a valve device 5, the workbench 1 is fixedly installed with a clamp 6, the workbench 1 is fixedly installed with a lifting device 7, the lifting device 7 is fixedly installed with a film rack 8, the workbench 1 and below the film rack 8 are fixedly installed with a sealing element 9, the valve device 5 is fixedly connected with a heat storage pressure tank 10, the heat storage pressure tank 10 is fixedly installed with a second heating device 11, and the second heating device 11 is used for heating and heat preservation of the fluid in the heat storage pressure tank 10. The sealing cover 2 is fixedly installed with an internal circulation mechanism 22, the exhaust port of the internal circulation mechanism 22 communicates with the inside of the sealing cover 2, and the suction port of the internal circulation mechanism 22 communicates with the end face of the workbench 1. The internal circulation mechanism 22 makes the hot fluid impact the film, further improves the uniformity and tightness of the film and the workpiece surface, and improves the film coating quality.

[0063] In this embodiment, the inner circulation mechanism 22 includes a circulation pump fixedly installed on the outer side wall of the sealing cover 2 and a flow guide pipe. One end of the flow guide pipe is connected to the inlet of the circulation pump, and the other end extends to the end face area of the workbench 1 as a suction port for extracting the hot fluid at the bottom of the sealing cover 2. The outlet of the circulation pump is connected to the top area of the sealing cover 2 as a discharge port through another section of the flow guide pipe for re-injecting the hot fluid into the sealing cover 2. The inner circulation mechanism 22 forms a circulating flow of the hot fluid inside the sealing cover 2, which is sucked from the end face of the workbench 1, pressurized by the circulation pump, and discharged from the top of the sealing cover 2, forming a top-down fluid impact. This circulating flow ensures that the hot fluid uniformly covers the surface of the film, avoids local temperature differences, and improves the heat conduction efficiency between the film and the workpiece.

[0064] During operation, the inner circulation mechanism 22 works in conjunction with the valve device 5. The valve device 5 provides initial hot fluid injection to establish a high-pressure environment inside the sealing cover 2, while the inner circulation mechanism 22 maintains dynamic circulation of the fluid. This design is particularly suitable for high-texture films, such as those with three-dimensional embossing or micro-nano grooves, as the impact force of the circulating hot fluid can penetrate the texture details and force the film to fully adhere to the workpiece surface. The inner circulation mechanism 22 also prevents the film from cooling during the pressurization process through continuous heat exchange, ensuring that the glue remains in a molten state, thereby improving the overall quality and efficiency of the film coating.

[0065] The inner circulation mechanism 22 of this embodiment further optimizes the film coating process. By circulating the hot fluid, it not only improves temperature uniformity but also enhances the mechanical adhesion of the film. The shear force generated by fluid circulation helps to remove residual air between the film and the workpiece, reducing bubble formation. In addition, the inner circulation mechanism 22 can adjust the flow rate and direction to adapt to different film types and workpiece shapes, providing flexible processing capabilities. Overall, this embodiment achieves higher precision film coating through the inner circulation mechanism 22, suitable for high-end decorative and industrial applications.

[0066] Embodiment Eight:

[0067] A third temperature probe 23 is fixedly installed inside the sealing cover 2 of this embodiment to detect the temperature of the fluid inside the sealing cover 2 and control the power of the first heating device 3 in real time. An embodiment is provided.

[0068] In this embodiment, the workpiece vacuum film coating device comprises a workbench 1, which is sealingly connected with a sealing cover 2. The first heating device 3 is fixedly installed in the sealing cover 2, which is used to heat the film sheet, so as to soften the film sheet and melt the glue at the bottom, thereby facilitating the film coating process. The workbench 1 or the sealing cover 2 is fixedly connected with a vacuum pumping device 4 and a valve device 5. The vacuum pumping device 4 is used to pump out the air in the sealing cover 2 to form a vacuum environment, thereby avoiding the generation of air bubbles during the film coating. The workbench 1 is fixedly installed with a clamp 6, which is used to fix the workpiece and ensure that the workpiece remains stable during the film coating process. The workbench 1 is also fixedly installed with a lifting device 7, which is fixedly installed with a film frame 8. The film frame 8 is used to fix the periphery of the sealing film sheet. The lifting device 7 drives the film frame 8 to move up and down, thereby realizing the lifting operation of the film sheet. The workbench 1 is fixedly installed with a sealing element 9 below the film frame 8. When the film frame 8 moves downward, the film frame 8 is sealingly connected with the sealing element 9 to form a closed chamber. The closed chamber is also in a vacuum state, which is helpful for the adhesion of the film sheet to the surface of the workpiece. The valve device 5 is fixedly connected with a heat storage pressure tank 10, which is fixedly installed with a second heating device 11. The second heating device 11 is used to heat and keep warm the fluid in the heat storage pressure tank 10, thereby ensuring that the fluid maintains an appropriate temperature during the pressurization process, preventing the film sheet from cooling, and improving the film coating quality. The valve device 5 pumps the hot fluid in the heat storage pressure tank 10 into the sealing cover 2, thereby increasing the pressure in the sealing cover 2. Since the film sheet separates the space of the sealing cover 2 from the closed chamber, and the closed chamber is in a vacuum state, the pressure in the sealing cover 2 acts on the surface of the film sheet, thereby making the film sheet have a uniform strong force to adhere to the workpiece. This device is especially suitable for high-end decorative film sheets with complex surface textures, as well as glue that must be cured at high temperature and high pressure for a long period of time. Greater pressure and sufficient temperature must be applied to the film sheet, such as film sheets with three-dimensional embossing, micro-nano level grooves, deep cavity reverse buckling or dense texture, thereby improving the quality of finished products. The device is compatible with both gas and liquid fluids. The liquid fluid supports greater pressure and higher temperature, thereby further improving the film coating effect.

[0069] In this embodiment, a third temperature probe 23 is fixedly installed inside the sealing cover 2, which is used to detect the temperature of the fluid inside the sealing cover 2. The third temperature probe 23 monitors the fluid temperature inside the sealing cover 2 in real time and transmits the temperature data to the control system. According to the real-time temperature data, the control system dynamically adjusts the power of the first heating device 3. For example, when the third temperature probe 23 detects that the fluid temperature inside the sealing cover 2 is lower than the preset value, the control system increases the power of the first heating device 3 to increase the heating intensity, ensuring that the film softens and the glue at the bottom melts sufficiently, avoiding incomplete film covering or air bubbles due to insufficient temperature. Conversely, when the temperature is too high, the control system reduces the power of the first heating device 3 to prevent the film from overheating or the glue from melting excessively, affecting the film covering quality. This real-time temperature control mechanism ensures the stability and consistency of the film covering process, especially in high-texture film processing, where temperature fluctuations can cause uneven film adhesion. The introduction of the third temperature probe 23 effectively solves this problem and improves overall processing efficiency and yield. By combining the second heating device 11 of the heat storage pressure tank 10 and the first heating device 3 inside the sealing cover 2, the device realizes double temperature control, further optimizes heat management, reduces energy waste, and is compatible with multiple fluid types, adapting to different industrial needs.

[0070] In specific operation, the third temperature probe 23 uses temperature sensing equipment such as thermocouples or infrared sensors, installed on the inner wall of the sealing cover 2 or key positions where the fluid flows through, to ensure the accuracy and representativeness of temperature detection. The control system integrates PLC or microprocessor to process temperature data in real time and output control signals to the power adjustment unit of the first heating device 3, realizing closed-loop control. This design not only improves film covering quality, but also prolongs the service life of the device and reduces maintenance requirements. In addition, the application of the third temperature probe 23 enables the device to adapt to environmental changes, such as low-temperature workshops or high-temperature environments, automatically adjusting heating power to maintain optimal process conditions. Overall, through the integration of the third temperature probe 23, this embodiment strengthens temperature monitoring and adjustment capabilities, solves temperature-sensitive problems in high-texture film covering, and ensures high-quality and efficient production.

[0071] Embodiment Nine:

[0072] The sealing cover 2 or workbench 1 of this embodiment is fixedly connected with a pressure injection device 24, which is used to inject high-pressure gas into the interior to speed up the fluid discharge from the sealing cover 2 and improve processing efficiency when using liquid as the processing fluid after completing the film covering operation, as the liquid has poor compressibility and cannot be quickly injected from the recovery valve 14 into the heat storage temporary tank 13.

[0073] In this embodiment, the workpiece vacuum film coating device comprises a workbench 1, which is sealingly connected with a sealing cover 2. The first heating device 3 is fixedly installed in the sealing cover 2, which is used to soften the film and melt the glue at the bottom. The workbench 1 is fixedly installed with a clamp 6, which is used to fix the workpiece. In addition, the workbench 1 is fixedly installed with a lifting device 7, which is fixedly installed with a film frame 8, which is used to fix the periphery of the film. The workbench 1 is fixedly installed below the film frame 8 with a sealing element 9, which is used to sealingly connect with the film frame 8 when the film frame 8 moves down, forming a closed chamber. The sealing cover 2 or the workbench 1 is fixedly connected with a vacuum pump 4 and a valve device 5. The vacuum pump 4 is used to pump out the air in the sealing cover 2 to achieve a vacuum environment. The valve device 5 is fixedly connected with a heat storage pressure tank 10, which is fixedly installed with a second heating device 11, which is used to heat and keep warm the fluid in the tank, to ensure that the fluid maintains a high temperature during pressurization, to prevent the film from cooling, and to improve the film coating quality.

[0074] In this embodiment, the injection pressure device 24 is fixedly connected to the side wall of the sealing cover 2. The injection pressure device 24 comprises a high-pressure gas source, a control valve and a connecting pipeline. The high-pressure gas source provides compressed gas, the control valve is used to adjust the gas flow and pressure, and the connecting pipeline introduces high-pressure gas into the inside of the sealing cover 2. The design of the injection pressure device 24 allows high-pressure gas to be injected into the sealing cover 2 quickly after the film coating operation is completed, to accelerate the discharge of the liquid fluid.

[0075] In the operation process, first, the workpiece is fixed on the clamp 6 of the workbench 1, and the film is fixed on the film frame 8. The first heating device 3 is started to heat the film, so that the film is softened and the glue at the bottom is melted. The vacuum pump 4 is started to pump out the air in the sealing cover 2 to form a vacuum environment. The lifting device 7 drives the film frame 8 to move down, so that the film is in contact with the surface of the workpiece, and the film frame 8 is sealingly connected with the sealing element 9 to form a closed chamber. The closed chamber is also in a vacuum state, ensuring that there is no air remaining between the film and the workpiece. The valve device 5 is started to extract the preheated fluid from the heat storage pressure tank 10 and pump it into the sealing cover 2. The choice of fluid can be a liquid, such as hot oil or water-based fluid, to provide higher pressure and higher temperature. Since the film separates the space of the sealing cover 2 from the closed chamber, and the closed chamber remains in a vacuum state, the increased pressure in the sealing cover 2 uniformly acts on the surface of the film, forcing the film to tightly adhere to the workpiece. It is especially suitable for films with complex surface textures such as three-dimensional relief or micro-nano level grooves, as well as glues that must be cured by high temperature and high pressure and long cycle. Greater pressure and sufficient temperature must be applied to the film to ensure high-quality film coating.

[0076] After the film is completed, the liquid fluid in the sealing cover 2 needs to be discharged and recycled to the heat storage temporary tank 13. Due to the poor compressibility of the liquid fluid, it is difficult to discharge quickly only by relying on gravity or low pressure difference, which will reduce the processing efficiency. At this time, the pressure injection device 24 is started, and the high-pressure gas source injects high-pressure gas into the sealing cover 2 through the control valve and the connecting pipeline. The injection of high-pressure gas increases the pressure in the sealing cover 2, forms a pressure difference, and pushes the liquid fluid to flow out quickly through the recycling valve 14 into the heat storage temporary tank 13. This process significantly speeds up the fluid discharge speed, reduces the waiting time, and improves the overall processing efficiency. The control valve of the pressure injection device 24 can adjust the gas pressure and flow according to the type and amount of fluid to ensure smooth and efficient discharge process.

[0077] The pressure injection device 24 of the embodiment is not only suitable for liquid fluid, but also can be used for auxiliary discharge of gas fluid, but the main advantage is reflected in the liquid operation. By integrating the pressure injection device 24, the workpiece vacuum film coating device realizes efficient and fast fluid recycling, is suitable for high-texture film and batch production of glue which must be cured by high temperature and high pressure and long cycle, and must be applied with greater pressure and sufficient temperature on the film, thereby improving the practicability and economy of the device. The whole device has compact structure and high automation degree of operation, and ensures the stability and repeatability of the film coating quality.

[0078] Example ten:

[0079] The sealing cover 2 or the workbench 1 of the embodiment is fixedly installed with a safety pressure relief valve to prevent the internal pressure of the sealing cover 2 from being overloaded and improve the processing safety.

[0080] In this embodiment, the workpiece vacuum film coating device comprises a workbench 1 which is sealingly connected with a sealing cover 2, and a first heating device 3 is fixedly installed in the sealing cover 2 for heating and softening the film and melting the bottom glue layer of the film. The workbench 1 is fixedly installed with a clamp 6 for fixing the workpiece. In addition, the workbench 1 is fixedly installed with a lifting device 7 which drives the film frame 8 to move up and down, and the film frame 8 is used for fixing the periphery of the sealing film. On the workbench 1, a sealing element 9 is fixedly installed below the film frame 8, and when the film frame 8 moves downward, the film frame 8 is sealingly connected with the sealing element 9 to form a closed chamber. The sealing cover 2 or the workbench 1 is fixedly connected with a vacuum pumping device 4 and a valve device 5, the vacuum pumping device 4 is used for pumping out the air in the sealing cover 2 to realize a vacuum environment, and the valve device 5 is used for pumping fluid into the sealing cover 2 to increase the pressure. The valve device 5 is fixedly connected with a heat storage pressure tank 10 which is fixedly installed with a second heating device 11 for heating and heat preservation of the fluid in the tank to ensure that the fluid maintains a suitable temperature during the pressurization process and prevents the film from cooling.

[0081] In this embodiment, the safety relief valve is fixedly installed on the sealing cover 2 or the heat storage pressure tank 10. The safety relief valve is a mechanical valve designed to automatically open when the internal pressure of the sealing cover 2 or the heat storage pressure tank 10 exceeds the preset safety threshold, releasing excess pressure and preventing damage or safety accidents due to overpressure. The installation position of the valve is optimized at the top area of the sealing cover 2 or the heat storage pressure tank 10 to facilitate rapid response to pressure changes. Its working principle is based on the combination of spring and sealing elements. When the internal pressure rises to a dangerous level, the pressure overcomes the spring force, pushing the valve to open, allowing fluid (such as gas or liquid) to be discharged to the external environment. Once the pressure returns to normal, the spring force closes the valve again, ensuring sealing. This design ensures that during the process of pumping hot fluid into the sealing cover 2 or the heat storage pressure tank 10, if the pressure abnormally rises due to operational errors, fluid overheating or other abnormal conditions, the safety relief valve can intervene in time to avoid excessive stress on the structure of the sealing cover 2 or the heat storage pressure tank 10, thereby protecting the integrity of the device and improving the safety of the operators.

[0082] During operation, the device first heats the diaphragm through the first heating device 3, softens and melts the bottom glue layer of the diaphragm, facilitating subsequent lamination. The vacuum device 4 is started to extract air from the sealing cover 2, forming a vacuum environment to remove air between the diaphragm and the workpiece, avoiding air bubbles. The lifting device 7 drives the diaphragm frame 8 to move down, making the diaphragm contact the workpiece surface, while the diaphragm frame 8 forms a sealed chamber with the sealing element 9 on the workbench 1, which maintains a vacuum state through the vacuum device 4. At this time, the valve device 5 extracts the preheated fluid (such as hot air or hot liquid) from the heat storage pressure tank 10 and pumps it into the sealing cover 2, increasing the pressure inside the sealing cover 2. Since the diaphragm separates the sealing cover 2 space from the sealed chamber, and the sealed chamber is in a vacuum state, the increased pressure uniformly acts on the surface of the diaphragm, exerting a strong force to force the diaphragm to completely adhere to the workpiece. Even if the surface has complex textures such as three-dimensional relief, micro-nano level grooves or deep cavity inverted buckles, high-end decorative diaphragms that must be cured by high temperature and high pressure for a long period of time, and the diaphragm must be subjected to greater pressure and sufficient temperature, high-quality diaphragm coating can still be achieved. The safety relief valve continuously monitors the pressure in the sealing cover 2 during the entire process to ensure that the pressure is always within a safe range, thereby improving the safety and reliability of the overall processing.

[0083] This embodiment effectively solves the risk of overloading in high-pressure processing of the vacuum coating device by integrating the safety relief valve, compatible with gas and liquid fluid types, and maintains the diaphragm temperature through hot fluid pressurization, optimizing the coating quality and work efficiency.

[0084] Embodiment eleven:

[0085] The embodiment provides a workpiece vacuum film coating method. First, the film is fixed on the film holder 8, ensuring that the periphery of the film is in sealed connection with the film holder 8 to prevent fluid or air leakage in subsequent operations. The film is usually a high-end decorative material with complex surface texture, such as a type with three-dimensional relief, micro-nano level groove or deep cavity inverted structure, which requires high pressure to achieve complete attachment. After fixing the film, the workpiece is placed on the workbench 1, which is designed to support the workpiece and ensure that it remains stable during processing.

[0086] Next, the sealing cover 2 is sealed with the workbench 1 to form an initial sealed environment. The first heating device 3 is started to heat the film, the purpose of which is to soften the film and melt the glue or adhesive on the film, improving its plasticity and adhesion. The heating process is usually carried out at a controlled temperature to ensure that the film is uniformly heated without damaging its structure. After completing the heating, the vacuum pump 4 is started to pump out the air inside the sealing cover 2, thereby establishing a vacuum environment inside the cover. This step eliminates the air between the film and the workpiece, avoiding bubbles or gaps when coating the film, and improving the quality of the finished product.

[0087] Subsequently, the lifting device 7 is started to drive the film holder 8 to move downward, causing the film to gradually adhere to the surface of the workpiece. In this process, the film holder 8 is in sealed connection with the sealing element 9, thereby building an independent sealed cavity between the film, the film holder 8 and the workbench 1. The workpiece is located inside the sealed cavity, which also maintains a vacuum state, ensuring that the film is not disturbed by external pressure when initially adhering. This sealed structure allows the subsequent pressurization operation to be targeted at the surface of the film.

[0088] The valve device 5 is started to pump hot fluid into the sealing cover 2. The hot fluid can be a gas or a liquid, and the embodiment preferably uses a liquid fluid because it can provide higher pressure, higher temperature and larger heat capacity, which helps to maintain temperature stability. After pumping the hot fluid, the pressure in the sealing cover 2 increases, while the sealed cavity remains in a vacuum state, thus creating a significant pressure difference on both sides of the film. This pressure difference forces the film to uniformly and strongly adhere to the surface of the workpiece, even for films with complex textures, and for glues that must be cured at high temperature and high pressure for a long period of time, ensuring complete coverage without bubbles.

[0089] To further improve the adhesion quality, the internal circulation mechanism 22 is started to make the hot fluid circulate and impact the surface of the film in the sealing cover 2. The internal circulation mechanism 22 enhances heat transfer and pressure distribution through fluid dynamics, thereby improving the uniformity of temperature and the tightness of the film and the workpiece surface. Uniformity ensures that the glue or adhesive remains in the best state throughout the process, while tightness eliminates small irregularities or texture gaps.

[0090] After the pressurization and circulation are completed, the recovery valve 14 is opened to release the hot fluid in the sealed cover 2 into the heat storage temporary tank 13. This step gradually reduces the pressure in the sealed cover 2, and when the pressure in the cover is equal to the ambient pressure, the recovery valve 14 is automatically closed to prevent damage to the diaphragm or the workpiece caused by sudden pressure changes. Finally, the pressure in the sealed cavity is released and the sealed cover is opened, and the workpiece with the completed film is removed. The entire method realizes high-quality film coating of high-texture films by combining vacuum, heating, pressurization, and fluid circulation, improving production efficiency and product consistency.

[0091] Example twelve:

[0092] In step S3, the fourth heating device 17 is started, and the fourth heating device 17 is moved between the film and the workpiece to simultaneously heat the glue below the film and preheat the workpiece. This embodiment describes the operation process and principle of the method in detail, and is particularly suitable for processing films with complex surface textures, such as high-end decorative films with three-dimensional embossing, micro-nano-level grooves, deep cavity reverse buckling, or dense textures, and glues that must be cured at high temperature and high pressure and for a long period of time. Greater pressure and sufficient temperature must be applied to ensure that the film can be completely attached to the surface of the workpiece to avoid the generation of air bubbles and improve the quality of the finished product.

[0093] It should be noted that the relational terms herein, such as first and second, are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus including the element.

[0094] The above description is only to illustrate the technical solutions of the present application and not to limit the present application. Other modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art without departing from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A vacuum coating apparatus for workpieces, comprising a worktable, a sealing cover sealed to the worktable, a first heating device fixedly installed inside the sealing cover, a vacuum pumping device and a valve device fixedly connected to the sealing cover or the worktable, and a clamp fixedly installed on the worktable, characterized in that... The workbench is fixedly equipped with a lifting device, the lifting device is fixedly equipped with a membrane frame, the workbench is fixedly equipped with a sealing element located below the membrane frame, the valve device is fixedly connected to a heat storage pressure tank, and the heat storage pressure tank is fixedly equipped with a second heating device.

2. The workpiece vacuum coating device according to claim 1, characterized in that, The thermal storage pressure tank is fixedly connected to a thermal storage temporary tank via a pressure pump. The thermal storage temporary tank is fixedly connected to a recovery valve, which is fixedly connected to the workbench or the sealing cover.

3. The workpiece vacuum coating device according to claim 2, characterized in that, The thermal storage tank is fixedly equipped with a third heating device.

4. The workpiece vacuum coating device according to claim 1, characterized in that, A telescopic mechanism is fixedly installed inside the sealing cover, and a fourth heating device is fixedly installed in the telescopic mechanism. The fourth heating device includes an upper heating component and a lower heating component.

5. The workpiece vacuum coating device according to claim 3, characterized in that, The upper heating element is fixedly equipped with a first temperature sensing device, and the lower heating element is fixedly equipped with a second temperature sensing device.

6. The workpiece vacuum coating device according to claim 1, characterized in that, The sealing cover is fixedly equipped with an internal circulation mechanism. The outlet of the internal circulation mechanism is connected to the inside of the sealing cover, and the suction port of the internal circulation mechanism is connected to the end face of the workbench.

7. The workpiece vacuum coating device according to claim 1, characterized in that, A third temperature sensing device is fixedly installed inside the sealing cover.

8. The workpiece vacuum coating device according to claim 1, characterized in that, The sealing cover or workbench is fixedly connected to a pressure injection device.

9. A workpiece vacuum coating device according to claim 1, characterized in that, The sealing cover or workbench is fixedly equipped with a first safety pressure relief valve.

10. A workpiece vacuum coating apparatus according to claim 1, characterized in that, The thermal storage pressure tank is fixedly equipped with a second safety pressure relief valve.

11. A method for vacuum coating a workpiece, comprising the apparatus described in claims 1-10, characterized in that, The method includes: S1: Fix the diaphragm to the membrane frame, and seal the periphery of the diaphragm to the membrane frame; S2: Place the workpiece on the worktable; S3: Seal the sealing cover with the workbench, and start the first heating device to heat the diaphragm; S4: Activate the vacuum pump to extract the air from inside the sealing cover; S5: Activate the lifting device to move the membrane frame down, so that the membrane is attached to the surface of the workpiece. The membrane frame is sealed to the sealing element, so that a sealed cavity is formed between the membrane, the membrane frame and the worktable, and the workpiece is located inside the sealed cavity. S6: Activate the valve device to pump hot fluid into the inside of the sealing cover, so as to generate a pressure difference on both sides of the diaphragm and make the diaphragm fully adhere to the surface of the workpiece; S7: Activate the internal circulation mechanism to allow the hot fluid to impact the diaphragm, further improving the temperature uniformity and adhesion between the diaphragm and the workpiece surface; S8: Open the recovery valve to release the hot fluid in the sealing cover into the heat storage tank. When the pressure inside the sealing cover is equal to that outside, the recovery valve is closed. S9: Release the pressure in the sealed cavity, then open the sealing cover and take out the coated workpiece.

12. The vacuum coating method for a workpiece according to claim 11, characterized in that, S3 further includes: activating a fourth heating device, moving the fourth heating device between the diaphragm and the workpiece, and simultaneously heating the adhesive under the diaphragm and preheating the workpiece.

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