Pressure-adjustable air floating roller, coating equipment and coating control method thereof

Abstract

The invention discloses a pressure-adjustable air floating roller, coating equipment and a coating control method thereof.The pressure-adjustable air floating roller comprises an air floating roller base body and two end covers, a plurality of air holes are formed in the outer surface of the air floating roller base body, a cavity is formed in the air floating roller base body, a plurality of partition plates are arranged in the air floating roller base body, and the two end covers are arranged in the cavity. A plurality of partition plates are arranged in the cavity and used for dividing the cavity into a plurality of independent air chambers, a plurality of air inlet pipes are connected to the outer side of the air floating roller base body and communicate with the independent air chambers one to one, each air inlet pipe is connected with an air inlet adjusting device, and the air inlet adjusting devices are used for adjusting the air pressure of each independent air chamber. The coating equipment comprises the pressure-adjustable air floating roller, and the coating control method is applied to the coating equipment. According to the pressure-adjustable air floating roller, the air floating height of the foil in the length direction of the pressure-adjustable air floating roller tends to be consistent, so that the distance between the die head lip and the foil tends to be consistent, and the coating quality of a pole piece is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coating equipment, and in particular to a pressure-adjustable air flotation roller, coating equipment and a coating control method thereof. Background Art

[0002] There are two main types of equipment for simultaneous coating of both sides A and B of lithium battery pole pieces. The specific difference lies in the layout of the B side. When coating the B side, refer to Figure 1 One of the methods is: the B-side die head is vertically upward, and the B-side foil is supported by the protrusion of the lower lip (staggered lip die head) to ensure that the distance between the lip and the front foil is stable and accurate, so as to achieve stable coating of the B side. After the B side is coated, the two wet films enter the suspension oven together. The disadvantage of this coating method is that the distance between the lip of the B-side die head and the upper foil is determined by the height of the lip protrusion, which cannot be adjusted and has poor versatility. In addition, the B-side foil is easily rubbed against the lip, resulting in jitter, which affects the coating quality of the electrode.

[0003] Reference Figure 2 , Figure 3 and Figure 4 Another coating method is: the B-side die is placed horizontally, and the air flotation roller replaces the coating steel roller to achieve non-contact support and reversing of the wet film. However, the entire air chamber of the air flotation roller is a connected whole with a single pressure. When the gas on the air flotation surface is wrapped by the foil, the exhaust is not smooth, resulting in the height of the floating foil being high in the middle and low on both sides in the length direction of the air flotation roller, resulting in unequal distance between the die lip and the foil, affecting the coating quality of the electrode. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a pressure-adjustable air flotation roller, a coating device and a coating control method thereof, which can make the air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller tend to be consistent, thereby making the distance between the die lip and the foil tend to be consistent, thereby ensuring the coating quality of the electrode.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A pressure-adjustable air flotation roller comprises an air flotation roller substrate and end caps arranged at both ends of the air flotation roller substrate, the outer surface of the air flotation roller substrate is provided with a plurality of air holes, a cavity is provided inside the air flotation roller substrate, the air holes are connected to the cavity, a plurality of partitions are provided inside the air flotation roller substrate, the plurality of partitions are used to divide the cavity into a plurality of independent air chambers, a plurality of air inlet pipes are connected to the outside of the air flotation roller substrate, the plurality of air inlet pipes are respectively connected to the plurality of independent air chambers one by one, each of the air inlet pipes is connected to an air inlet regulating device, and the air inlet regulating device is used to regulate the air pressure of each independent air chamber.

[0007] As a further improvement of the above technical solution, the intake regulating device includes a pressure regulating valve and an electrical proportional valve, which are sequentially arranged on the intake pipe. The pressure regulating valve is used to adjust the intake flow and pressure of the intake pipe, and the electrical proportional valve is used to continuously and steplessly adjust the intake pressure of the intake pipe.

[0008] As a further improvement of the above technical solution, an air outlet plate is provided on the outer surface of the air floating roller base, and a plurality of the air holes are provided on the air outlet plate.

[0009] As a further improvement of the above technical solution, the air outlet plate is an arc-shaped structure, and the inner wall of the air outlet plate abuts against the outer wall of the air flotation roller base.

[0010] As a further improvement of the above technical solution, a plurality of flow channels are arranged on the contact surface between the air flotation roller base and the air outlet plate, and the flow channels are connected to the independent air chamber.

[0011] As a further improvement of the above technical solution, the air outlet plate is made of a porous medium material, and a plurality of air holes are formed inside the porous medium material.

[0012] A coating device comprises an unwinding mechanism, a first coating die head, a coating steel roller, a second coating die head, the pressure-adjustable air flotation roller as described above, a laser interferometer, an air flotation reversing roller, a movable slide, an oven, an area density meter and a winding mechanism, the coating steel roller being arranged in sequence along the moving direction of a foil material, the pressure-adjustable air flotation roller being located on one side of the first coating die head, the pressure-adjustable air flotation roller being located on one side of the second coating die head, the first coating die head and the second coating die head coating two sides of the foil material respectively, the pressure-adjustable air flotation roller being able to adjust the air flotation height of the foil material on its surface, the laser interferometer being used for detecting the air flotation height of the foil material on the pressure-adjustable air flotation roller, the movable slide being used for driving the air flotation reversing roller to move up and down, and the area density meter being used for detecting the coating thickness of the foil material after drying.

[0013] A coating control method, using the coating device as described above, comprises the following steps:

[0014] Step 1, starting the coating equipment;

[0015] Step 2, setting the air flotation height a0 of the foil on the pressure-adjustable air flotation roller according to the process requirements;

[0016] Step 3, the laser interferometer detects the air floating height of the foil on the pressure-adjustable air floating roller;

[0017] Step 4, the air intake regulating device adjusts the air pressure P1 in each independent air chamber according to the air floating height detected by the laser interferometer, and roughly adjusts the air floating height to the set air floating height a0;

[0018] Step 5, the laser interferometer moves along the length direction of the pressure-adjustable air flotation roller, and the laser interferometer detects the air flotation height a1 of the foil at different positions on the pressure-adjustable air flotation roller, and adjusts the reeling and unreeling tension and the height of the air flotation reversing roller according to the air flotation height a1, and fine-tunes the air flotation height to the set air flotation height a0;

[0019] Step 6: The surface density meter disposed at the oven outlet detects the surface density of the A surface, and the surface density meter transmits the detection data to the first coating die head, and the first coating die head adjusts the coating thickness to adjust the surface density of the A surface to the composite quality requirement;

[0020] Step 7: The surface density meter disposed at the oven outlet detects the surface density of the B surface. The surface density meter transmits the detection data to the pressure-adjustable air flotation roller. The pressure-adjustable air flotation roller adjusts the air flotation height, thereby changing the surface density of the B surface.

[0021] As a further improvement of the above technical solution, in step 2, the air pressure P0 in each independent air chamber is preset by the electrical proportional valve and the pressure regulating valve, thereby presetting the air flotation height a0 of the foil on the pressure-adjustable air flotation roller.

[0022] As a further improvement of the above technical solution, in step 7, the surface density meter feeds back the out-of-tolerance data to the electrical proportional valve via an analog signal, and the electrical proportional valve adjusts a preset air flotation height.

[0023] The beneficial effects of the present invention are:

[0024] The pressure-adjustable air flotation roller provided by the present invention is provided with a plurality of independent air chambers and a plurality of air inlet regulating devices. Each air inlet regulating device individually adjusts the air pressure of the corresponding independent air chamber, so that the air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller tends to be consistent, thereby making the distance between the die head lip and the foil tend to be consistent, thereby ensuring the coating quality of the electrode piece.

[0025] The coating equipment provided by the present invention uses the above-mentioned pressure-adjustable air flotation roller, and uses a laser interferometer to detect the flotation height of the foil passing through the pressure-adjustable air flotation roller. Multiple air inlet adjustment devices in the pressure-adjustable air flotation roller respectively control the air pressure of multiple independent air chambers separately, so that the flotation height of the foil in the length direction of the pressure-adjustable air flotation roller tends to be consistent. At the same time, by adjusting the winding and unwinding tension and the height of the air flotation reversing roller, the flotation height of the foil in the length direction of the pressure-adjustable air flotation roller can be fine-tuned. In addition, the surface density meter detects the surface density of the foil and feeds back the detected abnormal points, so that the corresponding mechanism can fine-tune the corresponding area, thereby ensuring the coating quality of the electrode.

[0026] The coating control method of the coating equipment provided by the present invention uses the above-mentioned coating equipment to detect the flotation height of the foil passing through the pressure-adjustable air flotation roller through a laser interferometer, and multiple air inlet adjustment devices in the pressure-adjustable air flotation roller respectively control the air pressure of multiple independent air chambers separately, so that the flotation height of the foil in the length direction of the pressure-adjustable air flotation roller tends to be consistent. At the same time, by adjusting the winding and unwinding tension and the height of the air flotation reversing roller, the flotation height of the foil in the length direction of the pressure-adjustable air flotation roller can be fine-tuned, and the surface density meter detects the surface density of the foil and feeds back the detected abnormal points, so that the corresponding mechanism can fine-tune the corresponding area, thereby ensuring the coating quality of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the structure of a coating device without using an air flotation roller;

[0029] Figure 2 It is a schematic diagram of the structure of a coating device using a common air floating roller;

[0030] Figure 3 This is a schematic diagram of the structure of a common air flotation roller;

[0031] Figure 4 It is a schematic diagram of the air flotation height of the foil on a common air flotation roller;

[0032] Figure 5 2 is a schematic structural diagram of a pressure-adjustable air flotation roller according to an embodiment of the present invention;

[0033] Figure 6 Schematic diagram of the structure of different air outlet plates of the pressure-adjustable air flotation roller according to an embodiment of the present invention;

[0034] Figure 7 yes Figure 5 A cross-sectional view of a medium pressure adjustable air flotation roller;

[0035] Figure 8 is a schematic structural diagram of a coating device according to an embodiment of the present invention;

[0036] Fig. 9 is a flow chart of a coating control method of a coating device according to an embodiment of the present invention;

[0037] Fig.10 is a schematic diagram of the air flotation height of a foil on a pressure-adjustable air flotation roller according to an embodiment of the present invention;

[0038] Fig.11 1 is a height difference relationship diagram between the air-floating roller with adjustable tension and pressure for unwinding and winding and the air-floating reversing roller in an embodiment of the present invention.

[0039] Figure numerals: 1-pressure-adjustable air-floating roller, 2-unwinding mechanism, 3-first coating die, 4-coating steel roller, 5-second coating die, 6-laser interferometer, 7-air-floating reversing roller, 8-movable slide, 9-oven, 10-surface density meter, 11-winding mechanism, 12-air-floating roller, 110-air-floating roller base, 111-flow channel, 120-end cover, 130-partition, 140-independent air chamber, 150-intake pipe, 160-intake regulating device, 161-pressure regulating valve, 162-electric proportional valve, 170-air outlet plate, 171-air hole. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0041] Reference Figure 5 and Figure 7 A pressure-adjustable air flotation roller 1 provided in an embodiment of the present invention comprises an air flotation roller substrate 110 and end covers 120 arranged at both ends of the air flotation roller substrate 110, a plurality of air holes 171 are arranged on the outer surface of the air flotation roller substrate 110, a cavity is arranged inside the air flotation roller substrate 110, the air holes 171 are connected to the cavity, a plurality of partitions 130 are arranged inside the air flotation roller substrate 110, the plurality of partitions 130 are used to divide the cavity into a plurality of independent air chambers 140, a plurality of air inlet pipes 150 are connected to the outside of the air flotation roller substrate 110, the plurality of air inlet pipes 150 are respectively connected to the plurality of independent air chambers 140 one by one, each air inlet pipe 150 is connected to an air inlet regulating device 160, the air inlet regulating device 160 is used to regulate the air pressure of each independent air chamber 140, so that the air pressure of each independent air chamber 140 can be regulated individually.

[0042] Furthermore, the air float roller base 110 is a horizontally placed cylindrical structure, and multiple independent air chambers 140 are arranged along the length direction of the air float roller base 110. The airflow enters the multiple independent air chambers 140 from multiple air inlet pipes 150 respectively, and then flows out from multiple air holes 171 and blows toward the foil. The buoyancy force formed by the airflow lifts the foil.

[0043] When the flotation height of the foil in the length direction of the pressure-adjustable flotation roller 1 tends to be higher in the middle and lower on both sides, each air inlet regulating device 160 separately adjusts the air pressure of the corresponding independent air chamber 140. Specifically, the air pressure of the independent air chambers 140 gradually increases from the middle to both sides, so that the flotation height of the foil in the length direction of the pressure-adjustable flotation roller 1 tends to be consistent, thereby making the distance between the die lip and the foil tend to be consistent, thereby ensuring the coating quality of the electrode.

[0044] Specifically, the air intake regulating device 160 includes a pressure regulating valve 161 and an electrical proportional valve 162, which are sequentially arranged on the air intake pipe 150. The pressure regulating valve 161 is used to adjust the air intake flow and pressure of the air intake pipe 150, and the electrical proportional valve 162 is used to continuously and steplessly adjust the air intake pressure of the air intake pipe 150, thereby steplessly adjusting the air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller 1, thereby improving the adjustment accuracy.

[0045] In some preferred embodiments, an air outlet plate 170 is provided on the outer surface of the air floating roller base 110, and a plurality of air holes 171 are provided on the air outlet plate 170. Specifically, the air outlet plate 170 is an arc-shaped structure, and the inner wall of the air outlet plate 170 abuts against the outer wall of the air floating roller base 110. Moreover, a plurality of flow channels 111 are provided on the contact surface between the air floating roller base 110 and the air outlet plate 170, and the flow channels 111 are connected to the independent air chamber 140, thereby ensuring smooth flow between the independent air chamber 140 and the air holes 171 on the air outlet plate 170.

[0046] Furthermore, the air outlet plate 170 is made of a porous medium material, and a plurality of air holes 171 are formed inside the porous medium material, thereby reducing the processing difficulty and saving the processing cost.

[0047] It should be noted that the porous medium material can be porous graphite, porous sintered metal, breathing steel and other materials.

[0048] During connection, the air outlet plate 170 may be fixed to the air floatation roller base 110 by riveting or bolting, or may be bonded to the air floatation roller base 110 , or may even be sintered together.

[0049] Furthermore, the surface of the gas outlet plate 170 may be a complete and continuous arc surface.

[0050] Reference Figure 6 The air outlet plate 170 may also be composed of a structure composed of a plurality of small arc bodies at intervals. Specifically, an exhaust channel is formed between two adjacent small arc bodies, thereby facilitating the consistency of the axial buoyancy of the air floating roller 12 .

[0051] Reference Figure 8The embodiment of the present invention further provides a coating device, comprising an unwinding mechanism 2, a first coating die 3, a coating steel roller 4, a second coating die 5, the above-mentioned pressure-adjustable air flotation roller 1, a laser interferometer 6, an air flotation reversing roller 7, a movable slide 8, an oven 9, an area density meter 10 and a winding mechanism 11, which are sequentially arranged along the moving direction of the foil. The coating steel roller 4 is located on one side of the first coating die 3, the pressure-adjustable air flotation roller 1 is located on one side of the second coating die 5, the first coating die 3 and the second coating die 5 coat both sides of the foil respectively, the pressure-adjustable air flotation roller 1 can adjust the air flotation height of the foil on its surface, the laser interferometer 6 is used to detect the air flotation height of the foil on the pressure-adjustable air flotation roller 1, the movable slide 8 is used to drive the air flotation reversing roller 7 to move up and down, and two area density meters 10 are provided, and the two area density meters 10 are respectively used to detect the coating thickness on both sides of the foil after drying.

[0052] During coating, the unwinding mechanism 2 unwinds the foil, the first coating die head 3 coats the A side of the foil wound on the coating steel roller 4, and then the second coating die head 5 coats the B side of the foil wound on the pressure-adjustable air flotation roller 1. At the same time, the laser interferometer 6 detects the air flotation height of the foil passing through the pressure-adjustable air flotation roller 1. The multiple air inlet regulating devices 160 in the pressure-adjustable air flotation roller 1 individually control the air pressure of multiple independent air chambers 140, so that the air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller 1 tends to be consistent. At the same time, by adjusting the retractable and retractable The coil tension and the height of the air-floating reversing roller 7 can fine-tune the air-floating height of the foil in the length direction of the pressure-adjustable air-floating roller 1. Then, the foil is horizontally output through the air-floating reversing roller 7, so that the foil enters the oven 9 horizontally. The oven 9 dries the double-sided coated foil. The two surface density meters 10 arranged at the outlet of the oven 9 detect the two sides of the foil respectively, and feed back the detected abnormal points so that the corresponding mechanism can fine-tune the corresponding area. Finally, the winding mechanism 11 will wind up the double-sided coated foil that meets the requirements, thereby ensuring the coating quality of the electrode.

[0053] Reference Figures 9 to 11 The embodiment of the present invention provides a coating control method for a coating device. The coating control method for the coating device using the coating device provided above includes the following steps:

[0054] Step 1, start the coating equipment;

[0055] Step 2: Preset the air pressure P0 in each independent air chamber 140 through the electrical proportional valve 162 and the pressure regulating valve 161 according to the process requirements, thereby presetting the air floating height a0 of the foil on the pressure adjustable air floating roller 1;

[0056] Step 3: using multiple sets of laser interferometers 6 to detect the air floating height of the foil on the pressure-adjustable air floating roller 1, and feeding back the data detected by the multiple sets of laser interferometers 6 to the air intake regulating device 160;

[0057] Step 4, the air intake regulating device 160 regulates the air pressure P1 in each independent air chamber 140 according to the air floating height detected by the laser interferometer 6, thereby roughly adjusting the air floating height to the set air floating height a0;

[0058] Step 5, the laser interferometer 6 moves along the length direction of the pressure-adjustable air flotation roller 1, and the laser interferometer 6 detects the air flotation height a1 of the foil at different positions on the pressure-adjustable air flotation roller 1, and adjusts the winding and unwinding tension and the height of the air flotation reversing roller 7 according to the air flotation height a1, and fine-tunes the air flotation height to the set air flotation height a0;

[0059] Step 6: The surface density meter 10 disposed at the outlet of the oven 9 detects the surface density of the A surface. The surface density meter 10 transmits the detection data to the first coating die head 3. The first coating die head 3 adjusts the coating thickness to adjust the surface density of the A surface to the composite quality requirement.

[0060] Step 7, the surface density meter 10 arranged at the outlet of the oven 9 detects the surface density of the B surface. The surface density meter 10 feeds back the out-of-tolerance data to the electrical proportional valve 162 through an analog signal. The electrical proportional valve 162 adjusts the intake pressure of the intake pipe 150, and then adjusts the pressure of each independent air chamber 140, so that the flotation height of the preset foil in the length direction of the pressure-adjustable flotation roller 1 can be adjusted to change the surface density of the B surface.

[0061] Furthermore, in step 4, the air pressure of each independent air chamber 140 is in a stable state, and the air flotation force of the pressure-adjustable air flotation roller 1 makes the foil in a stable state. Under a stable working state, the pressure in the area between the porous medium material and the foil above the air chamber with the same air pressure is stable at P2. The gas flowing out of the pressure-adjustable air flotation roller 1 will flow to both sides after impacting the foil, resulting in a larger flow rate on both sides than in the middle. According to the Bernoulli principle, the air flotation height of the foil at the edge of the independent air chamber 140 along the length direction of the pressure-adjustable air flotation roller 1 is lower than the air flotation height in the middle of the independent air chamber 140. The formula for the preset air flotation height of the foil detected by the laser interferometer 6 is:

[0062]

[0063] Among them, v is the gas flow rate after passing through the porous medium, ρ is the gas density, x represents the average pore size of the pores 171 in the corresponding area, △x represents half of the length of the independent air chamber 140 along the length direction of the pressure-adjustable air flotation roller 1, R is the gas constant, and T is the working room temperature of the pressure-adjustable air flotation roller 1. According to the formula, some parameters are fixed values, and there is a corresponding relationship between the gas flow rate v, the pressure P2 in the area between the porous medium material and the foil material, the pressure P1 of the independent air chamber 140, and the air flotation height a. The fitting formula of the air chamber pressure P1 and the preset air flotation height a0 can be obtained based on the data after multiple adjustments:

[0064] a0∝P1 n

[0065] The tendency of the foil to be suspended in the middle being high and on both sides being low results in the air flotation height detected by the laser interferometer 6 being only data of a certain area, and the air flotation heights of other areas being inconsistent with the detected area. To solve this problem, the number of independent air chambers 140 in the length direction of the pressure-adjustable air flotation roller 1 is increased to accurately control the air pressure of the independent air chambers 140 to reduce the fluctuation of the foil air flotation curve, so that the foil air flotation height tends to be consistent.

[0066] Furthermore, in step 5, the tension on the foil suspended on the pressure-adjustable air flotation roller 1 can be adjusted by changing the winding and unwinding tension and the height of the air flotation reversing roller 7, and then the air flotation height of the foil in different areas can be fine-tuned to make the air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller 1 consistent, and then the pressure of each independent air chamber 140 can be adjusted by feedback until the preset air flotation height is reached again. In the adjustment method of changing the winding and unwinding tension and the height of the air flotation reversing roller 7, the position of the laser interferometer 6 can be adjusted synchronously for feedback adjustment. This adjustment method has the possibility that the overall air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller 1 is low due to excessive tension. At this time, the pressure in each independent air chamber 140 can be fine-tuned again. Collect and organize multiple groups of independent air chamber 140 pressure values ​​P1 and winding and unwinding tension values ​​F of all areas that have been adjusted. 张 , air floating reversing roller 7 height h 换 The data of air flotation height a0 are fitted again, and the following formula is obtained:

[0067]

[0068] When the foil is running, the tension of the unwinding and winding rolls on the foil will pull the foil toward the side of the pressure-adjustable air flotation roller 1, causing the raised part of the foil in the length direction of the pressure-adjustable air flotation roller 1 to be flat, and the gas in this part fills the concave part, so that the air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller 1 tends to be consistent. Changing the tension of the unwinding and winding rolls and the height of the air flotation reversing roller 7 can adjust the tension of the foil on the side of the pressure-adjustable air flotation roller 1, thereby fine-tuning the air flotation height of the foil in the length direction of the pressure-adjustable air flotation roller 1, further ensuring the coating quality of the electrode.

[0069] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A pressure-adjustable air flotation roller, characterized in that: It includes an air flotation roller base and end covers arranged at both ends of the air flotation roller base, the outer surface of the air flotation roller base is provided with a plurality of air holes, the interior of the air flotation roller base is provided with a cavity, the air holes are connected with the cavity, a plurality of partitions are arranged inside the air flotation roller base, the plurality of partitions are used to divide the cavity into a plurality of independent air chambers, a plurality of air inlet pipes are connected to the outside of the air flotation roller base, the plurality of air inlet pipes are respectively connected with the plurality of independent air chambers one by one, each of the air inlet pipes is connected with an air inlet regulating device, and the air inlet regulating device is used to regulate the air pressure of each independent air chamber.

2. The pressure-adjustable air floating roller according to claim 1, characterized in that: The air intake regulating device includes a pressure regulating valve and an electrical proportional valve, which are sequentially arranged on the air intake pipe. The pressure regulating valve is used to regulate the air intake flow and pressure of the air intake pipe, and the electrical proportional valve is used to continuously and steplessly regulate the air intake pressure of the air intake pipe.

3. The pressure-adjustable air flotation roller according to claim 1, characterized in that: An air outlet plate is arranged on the outer surface of the air floating roller base, and a plurality of air holes are arranged on the air outlet plate.

4. The pressure-adjustable air floating roller according to claim 3, characterized in that: The air outlet plate is an arc-shaped structure, and the inner wall of the air outlet plate abuts against the outer wall of the air floating roller base.

5. The pressure-adjustable air floating roller according to claim 4, characterized in that: A plurality of flow channels are arranged on the contact surface between the air floating roller base and the air outlet plate, and the flow channels are connected to the independent air chambers.

6. The pressure-adjustable air floating roller according to claim 3, characterized in that: The air outlet plate is made of a porous medium material, and a plurality of air holes are formed inside the porous medium material.

7. A coating device, characterized in that: The invention comprises an unwinding mechanism, a first coating die head, a coating steel roller, a second coating die head, a pressure-adjustable air flotation roller as described in any one of claims 1 to 6, a laser interferometer, an air flotation reversing roller, a movable slide, an oven, an area density meter and a winding mechanism, the coating steel roller being located on one side of the first coating die head, the pressure-adjustable air flotation roller being located on one side of the second coating die head, the first coating die head and the second coating die head coating the two sides of the foil respectively, the pressure-adjustable air flotation roller being able to adjust the air flotation height of the foil on its surface, the laser interferometer being used to detect the air flotation height of the foil on the pressure-adjustable air flotation roller, the movable slide being used to drive the air flotation reversing roller to move up and down, and the area density meter being used to detect the coating thickness of the foil after drying.

8. A coating control method, characterized in that: The coating device according to claim 7 comprises the following steps: Step 1, starting the coating equipment; Step 2, setting the air flotation height a0 of the foil on the pressure-adjustable air flotation roller according to the process requirements; Step 3, the laser interferometer detects the air floating height of the foil on the pressure-adjustable air floating roller; Step 4, the air intake regulating device adjusts the air pressure P1 in each independent air chamber according to the air floating height detected by the laser interferometer, and roughly adjusts the air floating height to the set air floating height a0; Step 5, the laser interferometer moves along the length direction of the pressure-adjustable air flotation roller, and the laser interferometer detects the air flotation height a1 of the foil at different positions on the pressure-adjustable air flotation roller, and adjusts the reeling and unreeling tension and the height of the air flotation reversing roller according to the air flotation height a1, and fine-tunes the air flotation height to the set air flotation height a0; Step 6: The surface density meter disposed at the oven outlet detects the surface density of the A surface, and the surface density meter transmits the detection data to the first coating die head, and the first coating die head adjusts the coating thickness to adjust the surface density of the A surface to the composite quality requirement; Step 7: The surface density meter disposed at the oven outlet detects the surface density of the B surface. The surface density meter transmits the detection data to the pressure-adjustable air flotation roller. The pressure-adjustable air flotation roller adjusts the air flotation height, thereby changing the surface density of the B surface.

9. A coating control method according to claim 8, characterized in that: In the step 2, the air pressure P0 in each independent air chamber is preset by the electrical proportional valve and the pressure regulating valve, thereby presetting the air floating height a0 of the foil on the pressure-adjustable air floating roller.

10. A coating control method according to claim 8, characterized in that: In step 7, the surface density meter feeds back the out-of-tolerance data to the electrical proportional valve via an analog signal, and the electrical proportional valve adjusts the preset air flotation height.

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