Coating equipment for uniformly coating high-viscosity material

Abstract

The invention discloses coating equipment for uniformly coating a high-viscosity material, which belongs to the technical field of coating and comprises a coating chamber provided with a slit discharging mold and a conveying frame for conveying a coating film, the coating chamber is internally provided with a convex pressure applying module for increasing the contact area of a transfer coating belt, a temperature rising transfer module for increasing the temperature of one side of the transfer coating belt, a light sensation detection module for detecting the transfer quality of the transfer coating belt, and an automatic scraper coating module. The high-viscosity coating material is transferred from the slit discharging mold through the transfer coating belt and then is coated into the coating film, the viscosity of the material is accurately regulated and controlled through dynamic deformation (protrusion generation and recovery) of the transfer belt in combination with the temperature gradient, the transfer efficiency is improved, the coating uniformity (static smoothing) and the transfer controllability (temperature difference driving) are both considered, and the coating film is uniform in thickness and high in uniformity. The device is suitable for precise coating of high-viscosity materials, the coating quality of materials such as lithium battery electrodes is optimized, bubble / pinhole defects are reduced, and the production yield is increased.

Description

Technical Field

[0001] The present invention relates to the field of coating technology, and in particular to a coating device for uniformly applying high-viscosity materials. Background Art

[0002] In the manufacture of lithium battery electrodes, the uniform coating of high-viscosity materials such as polyimide is one of the core processes, which directly affects the energy density, cycle life, and safety of the battery.

[0003] Traditional coating technologies (such as transfer coating and slot coating) face the following problems: the transfer efficiency of high-viscosity materials is low. The high viscosity of the material (usually >10,000 mPa·s) results in strong adhesion, and it is easy to break or remain during peeling in the transfer coating process, causing uneven surface thickness of the coating film. Moreover, traditional transfer belts mostly have flat surfaces and lack dynamic deformation design, making it difficult to actively adjust the material distribution state through physical structure, resulting in the dependence on high-precision equipment debugging for coating uniformity. Therefore, a coating device for uniformly applying high-viscosity materials is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the transfer efficiency of high-viscosity materials is low. The high viscosity of the material results in strong adhesion, and it is easy to break or remain during peeling in the transfer coating process, causing uneven surface thickness of the coating film. A coating device for uniformly applying high-viscosity materials is proposed.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A coating device for uniformly applying high-viscosity materials includes a coating chamber equipped with a slot discharge die and a conveying rack for conveying the coating film. A transfer coating belt for transferring the high-viscosity material from the slot discharge die to the coating film is arranged in the coating chamber. A convex pressing module for increasing the contact area of the transfer coating belt, a heating transfer module for increasing the temperature on one side of the transfer coating belt, a light-sensing detection module for detecting the transfer quality of the transfer coating belt, and an automatic squeegee coating module are arranged in the coating chamber;

[0007] The convex pressing module includes a pressing circulation belt arranged in the coating chamber. The surface of the pressing circulation belt is densely provided with protrusions. The transfer coating belt itself is made of a transparent high-strength and high-toughness material. When the pressing circulation belt makes pressing contact with the transfer coating belt, corresponding protrusions can be generated on the surface of the transfer coating belt, increasing the contact area with the high-viscosity material;

[0008] The heating transfer module includes a heating cover, and a heat-conducting roller in contact with the transfer coating belt is arranged on the inner wall of the heating cover;

[0009] The light-sensing detection module includes a traction side roller, and detection rollers for changing the angle of the transfer coating belt are arranged on both sides of the traction side roller. A light-sensing detection component is arranged on the coating chamber at the position of the detection rollers;

[0010] The automatic scraper coating module includes a scraper disk connected by an electric driving push rod, and a scraper blade is arranged at the end of the scraper disk.

[0011] Preferably, a plurality of corner rollers for changing the conveying angle of the transfer coating belt are arranged on the coating chamber, and a driving motor connected to the corner rollers is arranged on the coating chamber.

[0012] Preferably, the pressing circulation belt is driven by a circulation roller arranged in the coating chamber. A circulation motor for driving the circulation roller to rotate is arranged on the coating chamber. A magnetic repulsion layer is arranged inside the pressing circulation belt, and a fixed magnetic plate is arranged on the inner wall of the coating chamber. The fixed magnetic plate and the magnetic repulsion layer repel each other magnetically.

[0013] Preferably, traction side belts are arranged on both sides of the transfer coating belt, and the traction side belts are in transmission connection with the traction side rollers.

[0014] Preferably, the light-sensing detection component includes a light-sensing emission end arranged inside and a light-sensing detection end arranged outside. The light-sensing emission end emits a light signal that penetrates the transfer coating belt and is signal-connected to the light-sensing detection end.

[0015] Preferably, a plurality of smoothing and pressing roller cylinders are evenly arranged at the bottom of the scraper disk, and the smoothing and pressing roller cylinders are in contact with the coating film.

[0016] Preferably, a conveying fitting plate is arranged on the conveying frame for supporting the pressure of the coating film during conveying.

[0017] Preferably, the slit discharge die is arranged above the convex pressing module, and can evenly coat a highly viscous material on the transfer coating belt.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, the highly viscous coating material is transferred from the slit discharge die through the transfer coating belt and then coated into the coating film. During the transfer process, the protrusions formed by the transfer coating belt assist the uniform distribution of the high-viscosity material, and the material automatically levels during the conveying process due to the static state, reducing surface defects, thereby ensuring the uniformity of the high-viscosity material coated on the coating film.

[0020] 2. When the present invention transfers and coats a high-viscosity material onto a coating film, when the coating film comes into contact with the transfer coating belt, the transfer coating belt is located above, and the protrusion has returned to its original state, reducing the contact adhesion force with the material. The transfer is driven by the temperature difference between the upper and lower parts of the high-viscosity material, further reducing the viscosity between the material and the transfer coating belt. The use of gravity and contact force enables efficient transfer, ensuring the coating quality of the coating film.

[0021] 3. By combining the dynamic deformation (protrusion generation and recovery) of the transfer coating belt with the temperature gradient, the present invention precisely regulates the viscosity of the material, improves the transfer efficiency, takes into account the coating uniformity (static flattening) and transfer controllability (temperature difference driving), is applicable to the precision coating of high-viscosity materials, optimizes the coating quality of materials such as lithium battery electrodes, reduces bubble / pinhole defects, and improves the production yield. Brief Description of the Drawings

[0022] Figure 1 It is a schematic assembly structure diagram of a coating device for uniformly applying a high-viscosity material proposed by the present invention;

[0023] Figure 2 It is a schematic partial structure diagram of a coating device for uniformly applying a high-viscosity material proposed by the present invention;

[0024] Figure 3 is Figure 2 an enlarged schematic structure diagram of part A in

[0025] Figure 4 It is a schematic three-dimensional structure diagram of a coating device for uniformly applying a high-viscosity material proposed by the present invention;

[0026] Figure 5 It is a schematic structure diagram of the transfer coating belt in a coating device for uniformly applying a high-viscosity material proposed by the present invention;

[0027] Figure 6 It is a schematic structure diagram of the protrusion pressing module in a coating device for uniformly applying a high-viscosity material proposed by the present invention;

[0028] Figure 7 It is a schematic structure diagram of the automatic scraper coating module in a coating device for uniformly applying a high-viscosity material proposed by the present invention.

[0029] In the figure: 1, coating chamber; 2, slit discharging die; 3, coating film; 4, conveying rack; 5, transfer coating belt; 6, pressing circulation belt; 7, protrusion; 8, heating hood; 9, heat conducting roller; 10, traction side roller; 11, detection roller; 12, electric drive push rod; 13, scraper disc; 14, scraper blade; 15, corner roller; 16, drive motor; 17, circulation roller; 18, magnetic repulsion layer; 19, fixed magnetic plate; 20, traction side belt; 21, light sensing emission end; 22, light sensing detection end; 23, smoothing and pressing roller; 24, conveying and laminating plate. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] Example, referring to Figures 1 to 7 , a coating device for uniformly applying high-viscosity materials, including a coating chamber 1 equipped with a slit discharging die 2 and a conveying rack 4 for conveying a coating film 3. Further, a conveying and laminating plate 24 is provided on the conveying rack 4 for supporting the pressure of the coating film 3 during conveying. The device for conveying the coating film 3 on the conveying rack 4 is a commonly used technology in the existing field and will not be elaborated here.

[0034] A plurality of corner rollers 15 for changing the conveying angle of the transfer coating belt 5 are provided on the coating chamber 1. A driving motor 16 connected to the corner roller 15 is provided on the coating chamber 1. The driving motor 16 is a prior art and will not be elaborated here in detail.

[0035] The slit discharging die 2 is arranged above the convex pressing module, and can evenly coat the high-viscosity material on the transfer coating belt 5. A transfer coating belt 5 for transferring the high-viscosity material from the slit discharging die 2 to the coating film 3 is arranged in the coating chamber 1. A convex pressing module for increasing the contact area of the transfer coating belt 5, a heating transfer module for increasing the temperature on one side of the transfer coating belt 5, a light-sensing detection module for detecting the transfer quality of the transfer coating belt 5, and an automatic blade coating module are arranged in the coating chamber 1;

[0036] The convex pressing module includes a pressing circulation belt 6 arranged in the coating chamber 1. The surface of the pressing circulation belt 6 is densely provided with protrusions 7. The transfer coating belt 5 itself is made of a transparent high-strength and high-toughness material. When the pressing circulation belt 6 makes pressure contact with the transfer coating belt 5, corresponding protrusions 7 can be generated on the surface of the transfer coating belt 5, increasing the contact area with the high-viscosity material;

[0037] When the pressing circulation belt 6 generates pressure on the transfer coating belt 5 above, the protrusions 7 arranged on the pressing circulation belt 6 will squeeze the transfer coating belt 5 made of high-strength and high-toughness material, thereby generating protrusions 7 on the surface of the transfer coating belt 5. The generation of the protrusions 7 can effectively increase the contact area and carrying friction force of the high-viscosity material, ensure the transfer of the high-viscosity material from the slit discharging die 2 to the transfer coating belt 5, and compared with the smooth surface state, the transfer coating belt 5 with protrusions 7 can more evenly achieve the uniform coating of the high-viscosity material.

[0038] Furthermore, the pressing circulation belt 6 is driven by a circulation roller 17 arranged in the coating chamber 1. A circulation motor for driving the circulation roller 17 to rotate is arranged on the coating chamber 1. A magnetic repulsion layer 18 is arranged inside the pressing circulation belt 6. A fixed magnetic plate 19 is arranged on the inner wall of the coating chamber 1. The fixed magnetic plate 19 and the magnetic repulsion layer 18 repel each other magnetically. Through the magnetic repulsion force between the fixed magnetic plate 19 and the magnetic repulsion layer 18, an upward pressure can be applied to the pressing circulation belt 6 to ensure that protrusions 7 can be generated on the surface of the transfer coating belt 5.

[0039] By combining the dynamic deformation (protrusion generation and recovery) of the transfer coating belt 5 with the temperature gradient, the viscosity of the material is precisely regulated, the transfer efficiency is improved, and the coating uniformity (static flattening) and transfer controllability (temperature difference driving) are taken into account, which is suitable for the precision coating of high-viscosity materials.

[0040] The temperature-raising transfer module includes a heating hood 8, in which a resistive heating component is arranged. A heat-conducting roller 9 that contacts the transfer coating belt 5 is arranged on the inner wall of the heating hood 8. The rolling of the heat-conducting roller 9 can be driven by a motor or by meshing transmission with the transfer coating belt 5;

[0041] The light-sensing detection module includes a traction side roller 10. Detection rollers 11 for changing the angle of the transfer coating belt 5 are arranged on both sides of the traction side roller 10. A light-sensing detection component is arranged on the coating chamber 1 at the position of the detection roller 11;

[0042] It should be noted that in order to ensure that the positions between the transfer coating belt 5 and the coating film 3 at the automatic scraper coating module can still be accurately corresponding, the traction side roller 10 and the detection roller 11 also need to be arranged correspondingly at opposite positions so that the transmission distances between them are the same.

[0043] Furthermore, traction side belts 20 are arranged on both sides of the transfer coating belt 5. The traction side belts 20 are in transmission connection with the traction side roller 10. The light-sensing detection component includes a light-sensing emission end 21 arranged inside and a light-sensing detection end 22 arranged outside. The light-sensing emission end 21 emits a light signal that penetrates the transfer coating belt 5 and is in signal connection with the light-sensing detection end 22.

[0044] The light-sensing emission end 21 arranged inside is triangularly arranged. When the transfer coating belt 5 passes by, when its surface contains a highly viscous material, the highly viscous material will block the light signal emitted by the light-sensing emission end 21, so that the light-sensing detection end 22 receives the signal, controls the automatic scraper coating module to work, and scrapes the highly viscous material adhered to the transfer coating belt 5 at the corresponding position, thereby effectively avoiding the occurrence of missed coating.

[0045] The automatic scraper coating module includes a scraper disc 13 connected by an electric drive push rod 12. A scraping blade 14 is arranged at the end of the scraper disc 13. A plurality of smoothing pressure roller cylinders 23 are evenly arranged at the bottom of the scraper disc 13. The smoothing pressure roller cylinders 23 contact the coating film 3, and the smoothing pressure roller cylinders 23 can apply pressure to the highly viscous material and coat it on the coating film 3.

[0046] In the preparation of lithium battery materials according to the present invention, a high-viscosity material is coated on a coating film 3. At this time, the coating film 3 is continuously conveyed by a roller shaft on a conveying rack 4. When passing through a coating chamber 1, a slit discharging die 2 coats the high-viscosity material on a transfer coating belt 5 that has been raised by the action of a pressure application circulating belt 6. The high-viscosity material will be evenly transferred onto the transfer coating belt 5. During the conveying process of the transfer coating belt 5, the high-viscosity material will automatically level itself in a static state. When the coating film 3 contacts the transfer coating belt 5, the transfer coating belt 5 is located above at this time, and the protrusions 7 on the transfer coating belt 5 are restored (changing the surface structure, reducing the adhesion force, making it easier for the material to be transferred), so the viscosity of the high-viscosity material is reduced. Under the action of its own gravity and contact force, the high-viscosity material will gradually be transferred onto the coating film 3. And during this process, a heat-conducting roller 9 in a temperature-raising transfer module will contact the transfer coating belt 5, so that the temperature above the high-viscosity material increases, generating a temperature difference with the temperature below the high-viscosity material. The increase in temperature will reduce the viscosity of the high-viscosity material, further driving the high-viscosity material to transfer from the transfer coating belt 5 to the coating film 3;

[0047] When the transfer coating belt 5 is conveyed to a light-sensing detection module, when the high-viscosity material on the transfer coating belt 5 is not fully transferred, there will be residues. The residues of the high-viscosity material will affect the reception of the light signal emitted by the light-sensing emission end 21 by the light-sensing detection end 22. At this time, it is detected that the transfer of the high-viscosity material by the transfer coating belt 5 is incomplete. The electric drive push rod 12 is controlled to drive the scraper disc 13 to move towards one end of the transfer coating belt 5, and the scraping blade 14 at its end is made to contact the transfer coating belt 5, so as to scrape the incompletely transferred high-viscosity material to the coating film 3 at the corresponding position, thus realizing the effective coating of the high-viscosity material.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A coating device for uniformly applying high-viscosity materials, comprising a coating chamber (1) equipped with a slit discharge die (2) and a conveying frame (4) for conveying a coating film (3), characterized in that: The coating chamber (1) is provided with a transfer coating belt (5) for transferring high-viscosity materials from a slit discharge die (2) to a coating film (3), and the coating chamber (1) is provided with a protrusion pressure module for increasing the contact area of ​​the transfer coating belt (5), a temperature increase transfer module for increasing the temperature of one side of the transfer coating belt (5), a light sensing detection module for detecting the transfer quality of the transfer coating belt (5), and an automatic scraper coating module; The protrusion pressure module comprises a pressure circulating belt (6) arranged in the coating chamber (1), the surface of the pressure circulating belt (6) is densely covered with protrusions (7), the transfer coating belt (5) itself is made of a transparent high-strength and toughness material, and when the pressure circulating belt (6) is in pressure contact with the transfer coating belt (5), corresponding protrusions (7) can be generated on the surface of the transfer coating belt (5), thereby increasing the contact area with the high-viscosity material; The temperature-raising transfer module comprises a heating cover (8), and the inner wall of the heating cover (8) is provided with a heat-conducting roller (9) in contact with the transfer coating belt (5); The optical detection module comprises a traction side roller (10), detection rollers (11) for changing the angle of the transfer coating belt (5) are arranged on both sides of the traction side roller (10), and an optical detection component is arranged on the coating chamber (1) located at the detection roller (11); The automatic scraper coating module comprises a scraper disc (13) connected by an electric drive push rod (12), and a scraper blade (14) is arranged at the end of the scraper disc (13).

2. A coating device for uniformly applying high-viscosity materials according to claim 1, characterized in that: The coating chamber (1) is provided with a plurality of angle rollers (15) for changing the conveying angle of the transfer coating tape (5), and the coating chamber (1) is provided with a driving motor (16) connected to the angle rollers (15).

3. A coating device for uniformly applying high-viscosity materials according to claim 1, characterized in that: The pressure circulating belt (6) is driven by a circulating roller (17) arranged in the coating chamber (1); the coating chamber (1) is provided with a circulating motor for driving the circulating roller (17) to rotate; a magnetic repulsion layer (18) is arranged inside the pressure circulating belt (6); a fixed magnetic plate (19) is arranged on the inner wall of the coating chamber (1); the fixed magnetic plate (19) and the magnetic repulsion layer (18) repel each other magnetically.

4. A coating device for uniformly applying high-viscosity materials according to claim 1, characterized in that: Traction side belts (20) are arranged on both sides of the transfer coating belt (5), and the traction side belts (20) are drivingly connected to the traction side rollers (10).

5. The coating device for uniformly applying high-viscosity materials according to claim 1, characterized in that: The light sensing detection element comprises a light sensing emitting end (21) arranged inside and a light sensing detection end (22) arranged outside. The light sensing emitting end (21) emits a light signal to penetrate the transfer coating tape (5) and is signal-connected with the light sensing detection end (22).

6. A coating device for uniformly applying high-viscosity materials according to claim 1, characterized in that: A plurality of smoothing and pressing rollers (23) are evenly arranged at the bottom of the scraper disk (13), and the smoothing and pressing rollers (23) are in contact with the coating film (3).

7. A coating device for uniformly applying high-viscosity materials according to claim 1, characterized in that: The conveying frame (4) is provided with a conveying laminating plate (24) for supporting the pressure of the coating film (3) during conveyance.

8. The coating device for uniformly applying high-viscosity materials according to claim 1, characterized in that: The slit discharge die (2) is arranged above the raised pressure module, and can evenly coat the high-viscosity material on the transfer coating belt (5).

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