Dynamic compression coating equipment

Abstract

This application relates to a dynamic pressing coating device, belonging to the technical field of lithium battery separators. It includes: a frame; a back roller, mounted on the frame, for driving continuous movement of the separator substrate; a pressure roller, movably mounted on the frame, for pressing the separator substrate against the surface of the back roller, the pressure roller having an air chamber connected to an air source device, the air source device being switchable to supply or extract air from the air chamber, and the surface of the pressure roller having a perforated structure communicating with the air chamber; and a coating roller, movably mounted on the frame, for coating adhesive onto the surface of the separator substrate. This application can reduce the possibility of slippage of the separator substrate during coating. The combination of the air chamber and the perforated structure enables two working modes: air film suspension and negative pressure adsorption, thereby adapting to the process requirements of different coating stages and improving the stability of coating quality.

Description

Technical Field

[0001] This application relates to the field of lithium battery separators, and more particularly to a dynamic pressing coating apparatus. Background Technology

[0002] In the field of lithium battery separator manufacturing, coating equipment typically employs anilox roller direct coating technology to treat the surface of the separator substrate. A typical structure includes a gravure anilox roller, a back roller, and a substrate conveying system. The anilox roller picks up the coating material and contacts the moving separator substrate, transferring functional coatings (such as ceramic or PVDF coatings) to the substrate surface. During this process, the conveying of the separator substrate relies on the rotational friction of the back roller, while the coating accuracy depends on the stability of the contact pressure between the anilox roller and the substrate.

[0003] Because lithium battery separator substrates are extremely thin (typically 5-20 μm) and have smooth surfaces, traditional equipment relies solely on friction for transmission between the substrate and the back roller, making it prone to slippage during high-speed operation or tension fluctuations. This slippage can lead to positional shifts or uneven thickness in the coating, severely affecting the consistency of the separator's ion permeability and consequently reducing battery safety performance. Summary of the Invention

[0004] In order to reduce the possibility of slippage of the diaphragm substrate during coating and thus improve the coating quality, this application provides a dynamic pressing coating device.

[0005] This application provides a dynamic compression coating device, which adopts the following technical solution:

[0006] A dynamic compression coating device, comprising:

[0007] frame;

[0008] A back roller, mounted on the frame, is used to drive the diaphragm substrate to move continuously.

[0009] A pressure roller, which can be moved up and down on the frame, is used to press the diaphragm substrate against the surface of the back roller;

[0010] A coating roller, movably mounted on the frame, is used to apply adhesive to the surface of the diaphragm substrate.

[0011] By adopting the above technical solution, the pressure roller and the back roller work together, and the pressure force is adjusted by the up and down movement of the pressure roller, which effectively prevents the slippage of the diaphragm substrate during high-speed operation and ensures the transmission synchronization between the diaphragm substrate and the back roller, thereby avoiding coating position deviation and uneven thickness. At the same time, the movable design of the coating roller enables it to adapt to different coating trajectories and adhesive pattern requirements, improving the equipment's process adaptability.

[0012] Optionally, the coating roller is a dotting roller, the surface of which is provided with dotting protrusions, and the dotting roller is mounted on the frame in a way that allows it to move left and right via a first base.

[0013] Optionally, a second base is provided on the first base, the second base is movably mounted on the first base, and the second base is provided with an anilox roller, the surface of which is provided with an adhesive storage groove.

[0014] By adopting the above technical solution, the left-right movement function of the first base allows for adjustment of the lateral position of the dotting roller, facilitating the matching of different width substrates or complex coating layout requirements. Furthermore, the adhesive storage tank of the anilox roller facilitates the removal and placement of adhesive, ensuring a continuous supply of adhesive to the dotting roller when in contact with it. The independent movement function of the second base allows for adjustable contact pressure between the anilox roller and the dotting roller, adapting to the transfer requirements of adhesives of different viscosities while preventing excessive pressure that could lead to adhesive splattering.

[0015] Optionally, a third base is provided on the second base. The third base is movably mounted on the second base and is provided with a material trough for storing glue. The opening of the material trough is oriented towards the anilox roller.

[0016] By adopting the above technical solution, the material tank is dynamically aligned with the anilox roller through the third base, ensuring that the glue is continuously and stably supplied to the surface of the anilox roller, avoiding coating defects caused by glue supply interruption; the design of the material tank opening facing the anilox roller optimizes the glue flow direction, reduces glue residue on the wall, and reduces cleaning frequency and maintenance costs.

[0017] Optionally, the pressure roller includes an inner steel roller and a rubber layer covering the outside of the inner steel roller. The inner steel roller has an air cavity inside and air holes on its surface. The air holes communicate with the air cavity. The rubber layer has a channel structure for communicating with the air holes. The inner steel roller has a rotary joint. One end of the rotary joint communicates with the air cavity, and the other end is connected to an air source device. The air source device can be switched to supply air to the air cavity or to extract air from it.

[0018] By adopting the above technical solution, the combination of air cavity and channel structure can realize two working modes: air film suspension and negative pressure adsorption. When supplying air, an air film is formed between the rubber layer and the diaphragm substrate, reducing friction and preventing scratches on the surface of the diaphragm substrate. When evacuating air, negative pressure adsorption enhances the positioning stability of the diaphragm substrate, which is especially suitable for high-speed coating of ultra-thin diaphragms, while avoiding the deformation of the diaphragm substrate caused by traditional rigid pressure rollers.

[0019] Optionally, the pore structure is a tapered gradient pore, wherein the diameter of the tapered gradient pore gradually increases from the outer surface of the rubber layer towards the air cavity.

[0020] By adopting the above technical solutions, the tapered gradient hole diameter expansion design optimizes the airflow direction, making the air film or negative pressure force evenly distributed, avoiding local pressure changes that cause the diaphragm substrate to vibrate; the gradually widening pore structure reduces the accumulation of glue or impurities in the pores, reduces the risk of pore structure blockage, and improves the long-term working reliability of the pore structure-air cavity system.

[0021] Optionally, the surface of the tapered gradient hole is integrally formed with a corrugated pattern, the corrugated pattern being composed of periodically alternating crests and troughs, and the extension direction of the crests being parallel to the axis of the tapered gradient hole.

[0022] By adopting the above technical solution, the periodic peak and trough structure of the corrugated pattern enhances the compressive deformation resistance of the hole wall. When the pressure roller is pressed, the corrugated elastic expansion and contraction compensates for the channel deformation of the tapered gradual hole, maintaining smooth airflow. The design of the peak section extending along the hole axis further guides the stable output of airflow and prevents turbulence from interfering with the transmission stability of the diaphragm substrate.

[0023] Optionally, the rubber layer includes a matrix and modified portions, wherein the carbon nanotube concentration in the modified portions is higher than that in the matrix, and the modified portions are distributed around the pore structure.

[0024] By adopting the above technical solution, the carbon nanotube-reinforced modification is locally concentrated around the pores, which significantly improves the structural strength of the pore walls and prevents the pores from collapsing and failing under compression conditions. At the same time, the low concentration design in the matrix region maintains the overall flexibility of the rubber layer and avoids substrate indentation or coating pressure fluctuations caused by material hardening.

[0025] Optionally, the surface of the rubber layer includes a high-friction area and a low-friction area, with the high-friction area located at both ends of the rubber layer and the low-friction area located in the middle section of the rubber layer.

[0026] By adopting the above technical solution, the high friction zone at both ends of the rubber layer enhances the adhesion between the pressure roller and the edge of the substrate, preventing the substrate from deviating. The low friction zone in the middle section reduces friction interference outside the glue coating area, ensuring the clarity of the coating edge. The regional friction characteristic design takes into account both positioning stability and coating quality, avoiding the process contradictions of traditional homogeneous pressure rollers.

[0027] In summary, this application includes the following beneficial technical effects:

[0028] 1. This application utilizes the coordinated action of the pressure roller and the back roller, and adjusts the clamping force by moving the pressure roller up and down, effectively preventing the slippage of the ultra-thin diaphragm substrate during high-speed operation, ensuring the synchronous transmission of the diaphragm substrate and the back roller, thereby avoiding coating position deviation and uneven thickness; at the same time, the movable design of the coating roller enables it to adapt to different coating trajectories and adhesive pattern requirements, improving the equipment's process adaptability.

[0029] 2. Through the design of the air chamber and pore structure, the combination of the air chamber and pore structure can realize two working modes: air film suspension and negative pressure adsorption. When supplying air, an air film is formed between the rubber layer and the diaphragm substrate, reducing friction and preventing scratches on the surface of the diaphragm substrate. When evacuating air, negative pressure adsorption enhances the positioning stability of the diaphragm substrate, which is especially suitable for high-speed coating of ultra-thin diaphragms. At the same time, the rapid switching function between air film and negative pressure adapts to the process requirements of different coating stages and improves the stability of coating quality. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a dynamic pressing coating device according to an embodiment of this application.

[0031] Figure 2 This is a schematic diagram illustrating the structure of the dot-coating roller and the anilox roller in the embodiments of this application.

[0032] Figure 3 This is a schematic diagram illustrating the structure of the first gap adjustment mechanism in the embodiments of this application.

[0033] Figure 4 This is a cross-sectional view illustrating the pressure roller in the embodiments of this application.

[0034] Figure 5 This is a structural schematic diagram illustrating the connection relationship between the air chamber and the air source device in the embodiments of this application.

[0035] Figure 6 yes Figure 4 A magnified view of a portion of point A in the diagram, illustrating the structural diagram of the channel.

[0036] Figure 7 This is a schematic diagram illustrating the positional relationship between the high-friction area and the low-friction area in the embodiments of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Guide roller; 12. First base; 13. Second base; 14. Third base; 2. Back roller; 3. Pressure roller; 31. Inner steel roller; 311. Air chamber; 312. Air hole; 313. Rotary joint; 314. Air source device; 32. Rubber layer; 321. Tapered gradient hole; 322. Corrugated pattern; 3221. Crest section; 3222. Trough section; 323. Matrix; 324. Modified part; 3 25. High friction zone; 326. Low friction zone; 4. Dotting roller; 41. Dotting protrusion; 5. Anilox roller; 51. Adhesive storage tank; 6. Material tank; 7. First gap adjustment mechanism; 71. Drive module; 711. Servo motor; 712. Reducer; 72. Transmission module; 721. Lead screw; 722. Slider; 73. Displacement amplification module; 731. First inclined block; 732. Second inclined block; 8. Second gap adjustment mechanism; 9. Third gap adjustment mechanism. Detailed Implementation

[0038] The following combination Figures 1-7 This application will be described in further detail below.

[0039] Example:

[0040] This application discloses a dynamic pressure coating device. (Refer to...) Figure 1 A dynamic pressing coating device includes a frame 1, a back roller 2 rotatably mounted on the frame 1, and multiple guide rollers 11. In use, a diaphragm substrate passes through the back roller 2 and the multiple guide rollers 11. The back roller 2 drives the diaphragm substrate to move continuously. A coating roller is movably mounted on the frame 1 to apply adhesive to the surface of the diaphragm substrate. To achieve dynamic pressing of the diaphragm substrate, a pressure roller 3 is movably mounted on the frame 1, pressing the diaphragm substrate against the surface of the back roller 2.

[0041] When using this coating equipment, the pressure roller 3 adjusts the pressure on the diaphragm substrate by moving up and down, eliminating the slippage problem caused by insufficient friction between the substrate and the back roller 2 in traditional equipment, ensuring the absolute synchronization between the diaphragm substrate and the back roller 2 during the coating process, thereby improving the defects of coating deviation and uneven thickness. At the same time, the mobility of the coating roller allows it to flexibly adapt to different coating paths and pattern design requirements, improving the equipment's compatibility with different processes.

[0042] Reference Figure 1 and Figure 2 The coating roller is a dot coating roller 4. The surface of the dot coating roller 4 is integrally formed with dot coating protrusions 41. The dot coating roller 4 is mounted on the frame 1 and can move left and right through the first base 12. A second base 13 is also provided on the first base 12. The second base 13 is mounted on the first base 12 and can move left and right. An anilox roller 5 is rotatably mounted on the second base 13. The surface of the anilox roller 5 is densely covered with glue storage grooves 51.

[0043] In use, the left-right movement function of the first base 12 allows for lateral position adjustment of the dotting roller 4, facilitating the matching of different width substrates or complex coating layout requirements. Furthermore, the adhesive storage tank 51 of the anilox roller 5 facilitates the removal and placement of adhesive, ensuring a continuous supply of adhesive to the dotting roller 4 when in contact with it. The independent movement function of the second base 13 allows for adjustable contact pressure between the anilox roller 5 and the dotting roller 4, adapting to the transfer requirements of adhesives of different viscosities while preventing excessive pressure that could cause adhesive splattering.

[0044] Reference Figure 1A third base 14 is also provided on the second base 13. The third base 14 is movably mounted on the second base 13. A material tank 6 for storing adhesive is installed on the third base 14, and the opening of the material tank 6 faces the anilox roller 5. In this way, the material tank 6 maintains dynamic alignment with the anilox roller 5 through the third base 14, ensuring a continuous and stable supply of adhesive to the surface of the anilox roller 5, avoiding coating interruptions or thickness fluctuations caused by interruption of adhesive supply. The design of the material tank 6 facing the anilox roller 5 makes the adhesive flow direction coordinate with the rotation direction of the anilox roller 5, reducing adhesive backflow and wall residue, reducing adhesive waste and cleaning frequency. At the same time, the mobility of the material tank 6 facilitates quick replacement of different types of adhesive, improving the changeover efficiency of the production line.

[0045] During operation, the back roller 2 and guide roller 11 rotate, causing the diaphragm substrate to move in a predetermined direction, moving the pressure roller 3 upward until it contacts the diaphragm substrate and presses it firmly against the back roller 2 to prevent slippage. The feed trough 6 slides to the right on the third base 14, contacting the anilox roller 5. Adhesive on the feed trough 6 is applied to the anilox roller 5, and as the anilox roller 5 rotates, the adhesive spreads across its surface. The anilox roller 5 moves to the right on the second base 13, contacting the dotting roller 4. Adhesive on the surface of the anilox roller 5 is applied to the dotting roller 4, and as the dotting roller 4 rotates, the adhesive spreads across its surface. The dotting roller 4 moves to the right on the first base 12, contacting the diaphragm substrate and pressing it firmly against the back roller 2. Adhesive on the surface of the dotting roller 4 is also applied to the diaphragm substrate. At this time, the diaphragm substrate continues to move in the predetermined direction, and the dotting roller 4 rotates, so the adhesive on the surface of the dotting roller 4 will be continuously applied to the surface of the diaphragm substrate to complete the coating process.

[0046] Reference Figure 1 The frame 1 is equipped with a first gap adjustment mechanism 7, a second gap adjustment mechanism 8, and a third gap adjustment mechanism 9, which are used to adjust the gaps between the pressure roller 3 and the back roller 2, the coating roller and the back roller 2, and the anilox roller 5 and the dot coating roller 4, respectively. Through the setting of the first gap adjustment mechanism 7, the second gap adjustment mechanism 8, and the third gap adjustment mechanism 9, the gaps between the rollers are adjusted, enabling the coating device to be used with diaphragm substrates of different thicknesses. This eliminates substrate slippage caused by excessive gaps or indentation defects caused by excessively small gaps, thus improving coating quality.

[0047] Reference Figure 1 and Figure 3 The first gap adjustment mechanism 7 includes a drive module 71, a transmission module 72 and a displacement amplification module 73. The drive module 71 drives the displacement amplification module 73 to move through the transmission module 72. The displacement amplification module 73 is connected to the bearing seat of the pressure roller 3.

[0048] Specifically, the drive module 71 includes a servo motor 711 and a reducer 712 connected to the output end of the servo motor 711. The transmission module 72 includes a lead screw 721 connected to the output end of the reducer 712 and a slider 722 threadedly engaged with the lead screw 721. The displacement amplification module 73 includes a first inclined block 731 and a second inclined block 732. The inclined surfaces of the first inclined block 731 and the second inclined block 732 are arranged to abut against each other. The first inclined block 731 is fixed to the slider 722, and the second inclined block 732 is connected to the bearing seat of the pressure roller 3. The bearing seat of the pressure roller 3 is also connected to an elastic reset member so that the inclined surface of the second inclined block 732 always abuts against the inclined surface of the first inclined block 731. In this embodiment, the elastic reset member is a spring. Thus, the high torque output of the servo motor 711 and the reducer 712 ensures the smoothness of the lead screw 721 transmission. The design of the slider 722 and the first inclined block 731 uses the geometric displacement amplification principle to proportionally reduce the axial movement of the lead screw 721 and convert it into a precise radial displacement.

[0049] In use, the servo motor 711 drives the lead screw 721 to move the slider 722 linearly. The bidirectional displacement adjustment is achieved by the synergistic action of the first inclined block 731, the second inclined block 732 and the elastic reset member: when the slider 722 moves along the preset first direction, the second inclined block 732 is squeezed by the first inclined block 731, pushing the bearing seat of the pressure roller 3 to move outward to increase the gap; when the slider 722 moves along the preset second direction, the elastic reset member releases the preload force to drive the bearing seat of the pressure roller 3 to reset in the opposite direction to reduce the gap between the two rollers, thereby achieving the purpose of precisely adjusting the gap between the pressure roller 3 and the back roller 2.

[0050] In this embodiment, the structures of the second adjustment mechanism 8 and the third adjustment mechanism 9 are similar to those of the first adjustment mechanism 7, and will not be described in detail here.

[0051] Reference Figure 4 and Figure 5The pressure roller 3 includes an inner steel roller 31 and a rubber layer 32 covering the outside of the inner steel roller 31. The rubber layer 32 is used to contact the diaphragm substrate. The inner steel roller 31 has an air cavity 311 inside. The surface of the inner steel roller 31 is evenly provided with a plurality of air holes 312, which are connected to the air cavity 311. The rubber layer 32 is evenly distributed with channel structures, and each channel structure is arranged in a one-to-one correspondence with the air hole 312 for connecting the air hole 312. A rotary joint 313 is installed on the inner steel roller 31, and one end of the rotary joint 313 is connected to the air cavity 311, and the other end is connected to an air source device 314. The air source device 314 can be switched to supply air to the air cavity 311 or to extract air. Thus, the air chamber 311 is connected to the air source device 314 through the rotary joint 313. In the air supply mode, compressed air forms a uniform air film through the channel structure, enabling non-contact suspension and pressing between the rubber layer 32 and the diaphragm substrate, eliminating scratches or deformation on the substrate surface caused by traditional mechanical pressing. In the air extraction mode, negative pressure adsorption makes the substrate tightly adhere to the surface of the back roller 2, solving the problem of local wrinkling caused by insufficient tension of the ultra-thin diaphragm. At the same time, the rapid switching function of air film and negative pressure adapts to the process requirements of different coating stages, improving the stability of coating quality.

[0052] The specific explanation is as follows:

[0053] When the air source device 314 supplies air, the "air cavity-channel structure" system is in air film suspension mode. This mode is suitable for high-speed precision coating. When the equipment runs at a high linear speed, compressed air is introduced into the air cavity 311, causing the channel structure on the surface of the pressure roller 3 to form a uniform air film. At this time, the hydrodynamic pressure effect of the air film maintains a certain air gap between the pressure roller 3 and the diaphragm substrate. This not only maintains stable transmission of the diaphragm substrate through air film pressure, but also avoids direct contact friction between the pressure roller 3 and the diaphragm substrate. This mode is particularly suitable when the tension of the diaphragm substrate is not fully stable in the early stage of coating, or when processing wet diaphragms with microporous structures on the surface, preventing deformation of the pore structure of the diaphragm substrate caused by the pressure of the pressure roller 3. At the same time, the lubrication effect of the air film reduces the accumulation of frictional heat during high-speed operation, avoiding shrinkage of the diaphragm substrate or abnormal curing of the adhesive caused by temperature rise.

[0054] When the air source device 314 evacuates air, the "air chamber-channel structure" system switches to negative pressure adsorption mode. This mode is suitable for the precision dot coating control stage. When the equipment enters the patterned dot coating process, the air source device 314 switches to evacuation mode, and the air chamber 311 quickly switches to adsorption mode. At this time, a local negative pressure is generated at the channel structure on the surface of the pressure roller 3, gently adsorbing the diaphragm substrate onto the surface of the pressure roller 3, forming a flexible clamping effect. This mode can effectively suppress the tension change caused by local coating of adhesive, and is especially suitable for intermittent dot coating or high-precision positioning coating. At the moment of contact between the dot coating roller 4 and the diaphragm substrate, the additional adhesion force provided by the negative pressure adsorption can offset the reverse force during adhesive transfer, ensuring the positional stability of the diaphragm substrate at the microscale and avoiding displacement of the coating point position. In addition, during emergency shutdown or low-speed debugging of the equipment, the negative pressure adsorption mode can prevent the diaphragm substrate from slackening and sagging through continuous adsorption.

[0055] In this way, the "air cavity-channel structure" system forms a dual-mode pressing system. Through the intelligent transition of "non-contact to contact", it retains the positioning accuracy of traditional mechanical pressing and integrates the protective advantages of air flotation technology. This enables the equipment to be compatible with all types of coating needs, from conventional dry-process diaphragms to high-strength ultra-thin composite diaphragms, while resolving the process contradiction between high-speed operation and precision coating.

[0056] Reference Figure 4 and Figure 6 The pore structure is a tapered, gradually expanding pore 321. The pore diameter of the tapered, gradually expanding pore 321 from the outer surface of the rubber layer 32 towards the air cavity 311 forms a tapered pore with a gradually widening inner cavity. The gradually expanding pore structure of the tapered, gradually expanding pore 321 is based on the arch bridge effect, that is, the gradually expanding pore wall structure transforms the transverse compressive stress into the longitudinal compressive stress, significantly reducing the transverse shrinkage rate of the pore structure under pressure, and preventing the blockage problem caused by the loss of cross-sectional area after the pore structure is deformed under pressure. At the same time, it is based on the Venturi effect, that is, the gradually expanding pore diameter guides the airflow to accelerate and form a stable laminar flow, avoiding the shaking of the diaphragm substrate or coating defects caused by turbulent disturbances. In addition, combined with the capillary effect, that is, the gradually narrowing inlet end increases the resistance to glue backflow, and with pulse backflushing, the pore structure can achieve self-cleaning. Thus, the pore structure failure problem is solved in a coordinated manner from three dimensions: resistance to pressure deformation, airflow stability, and anti-blockage.

[0057] Reference Figure 6The surface of the tapered gradient hole 321 is integrally formed with a corrugated pattern 322, which consists of periodically alternating crests 3221 and troughs 3222, with the crests 3221 extending parallel to the axis of the tapered gradient hole 321. The corrugated pattern 322 further enhances the radial compressive strength of the hole wall. When the pressure roller 3 is under pressure, the elastic expansion and contraction of the corrugations absorb the lateral deformation of the channel structure, preventing cross-sectional area loss caused by hole wall collapse and maintaining the smooth airflow of the channel structure. The design of the crests 3221 extending along the hole axis guides the airflow to a stable output in a fixed direction, suppressing the interference of turbulence on the transmission of the diaphragm substrate. Simultaneously, the corrugated pattern 322 increases the surface area of ​​the tapered gradient hole 321, which helps to accelerate heat dissipation during air film formation and prevents the rubber layer 32 from hardening and aging due to high temperatures.

[0058] Reference Figure 6 The rubber layer 32 includes a matrix 323 and modified portions 324 located on the outer surface of the rubber layer 32. The carbon nanotube concentration in the modified portions 324 is higher than that in the matrix 323, and the modified portions 324 are distributed around the pore structure. In this second embodiment, the carbon nanotubes incorporated into the modified portions 324 are multi-walled carbon nanotubes. The modified portions 324 are concentrated in the area around the pore structure, forming a high-modulus reinforcing phase around the pore structure, which significantly improves the lateral crush resistance and wear resistance of the pore walls. On the one hand, it prevents the cross-sectional area from shrinking due to lateral deformation when the pore structure is compressed, and on the other hand, it prevents the edge wear of the pore structure under high-frequency compression conditions. The low-concentration carbon nanotube design of the matrix 323 maintains the overall flexibility of the rubber layer 32, avoiding indentation of the diaphragm substrate or fluctuations in coating pressure caused by material hardening. At the same time, the directional distribution of carbon nanotubes optimizes the thermal conductivity of the rubber layer 32, accelerates the heat dissipation generated during gas film operation, and extends the service life of the pressure roller 3.

[0059] Reference Figure 7The surface of the rubber layer 32 includes a high-friction area 325 and a low-friction area 326. The surface friction coefficient of the high-friction area 325 is greater than that of the low-friction area 326. The high-friction area 325 is located at both ends of the rubber layer 32, and the low-friction area 326 is located in the middle section of the rubber layer 32. When the pressure roller 3 presses the diaphragm substrate, the high-friction area 325 at both ends of the rubber layer 32 increases the adhesion to the edge of the diaphragm substrate, effectively suppressing the lateral deviation of the diaphragm substrate. The low-friction area 326 in the middle section helps to reduce friction in the area to be coated, reducing the possibility of wear in the area to be coated. The design of the regional friction characteristics takes into account both positioning stability and coating quality. At the same time, the surface texture of the high-friction area 325 can capture the electrostatic charge on the edge of the diaphragm substrate, reducing the problem of electrostatic adsorption of dust during the diaphragm coating process and improving product cleanliness. In addition, after the coating is completed, the membrane substrate is usually trimmed by an edge trimming machine to eliminate coating edge effects and remove edge burrs and microcracks. The high friction areas 325 at both ends correspond to the membrane edges to be cut off later, so the final product quality will not be affected by the setting of the high friction areas 325.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dynamic pressing coating device, characterized in that, include: Rack (1); Back roller (2), mounted on the frame (1), is used to drive the diaphragm substrate to move continuously; The pressure roller (3) is mounted on the frame (1) and can move up and down. It is used to press the diaphragm substrate onto the surface of the back roller (2). The pressure roller (3) is provided with an air chamber (311). The air chamber (311) is connected to an air source device (314). The air source device (314) can be switched to supply air to the air chamber (311) or to extract air. The surface of the pressure roller (3) is provided with a channel structure that communicates with the air chamber (311). A coating roller, movably mounted on the frame (1), is used to coat adhesive onto the surface of the diaphragm substrate; The pressure roller (3) includes an inner steel roller (31) and a rubber layer (32) covering the outside of the inner steel roller (31). The air cavity (311) is located inside the inner steel roller (31). The channel structure is located on the rubber layer (32). The surface of the inner steel roller (31) is provided with air holes (312) for connecting the air cavity (311) and the channel structure. The channel structure is a tapered gradient hole (321), and the diameter of the tapered gradient hole (321) gradually increases from the outer surface of the rubber layer (32) towards the air cavity (311). The surface of the hole wall of the tapered gradient hole (321) is integrally formed with a corrugated pattern (322), which is composed of periodically alternating crest segments (3221) and trough segments (3222), and the extension direction of the crest segments (3221) is parallel to the axis of the tapered gradient hole (321).

2. The dynamic pressing coating equipment according to claim 1, characterized in that: The coating roller is a dotting roller (4), and the surface of the dotting roller (4) is provided with dotting protrusions (41). The dotting roller (4) is mounted on the frame (1) and can be moved left and right by the first base (12).

3. The dynamic pressing coating equipment according to claim 2, characterized in that: The first base (12) is provided with a second base (13), which is movably mounted on the first base (12) and is provided with an anilox roller (5). The surface of the anilox roller (5) is provided with a glue storage groove (51).

4. The dynamic pressing coating equipment according to claim 3, characterized in that: The second base (13) is provided with a third base (14), which is movably mounted on the second base (13). The third base (14) is provided with a material trough (6) for storing glue, and the opening of the material trough (6) is set towards the anilox roller (5).

5. The dynamic pressing coating equipment according to claim 1, characterized in that: The inner steel roller (31) is provided with a rotary joint (313), one end of which is connected to the air chamber (311) and the other end is connected to the air source device (314).

6. The dynamic pressing coating equipment according to claim 1, characterized in that: The rubber layer (32) includes a matrix (323) and a modified portion (324), wherein the carbon nanotube concentration of the modified portion (324) is higher than that of the matrix (323), and the modified portion (324) is distributed around the pore structure.

7. The dynamic pressing coating equipment according to claim 1, characterized in that: The surface of the rubber layer (32) includes a high friction area (325) and a low friction area (326). The high friction area (325) is located at both ends of the rubber layer (32), and the low friction area (326) is located in the middle section of the rubber layer (32).

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