Turn-back type coating machine

Abstract

The utility model relates to a turn-back type coating machine which comprises an unwinding and coating mechanism, a first drying oven, a surface changing mechanism, a second coating mechanism, a second drying oven, a third coating mechanism, a fourth coating mechanism, a fourth coating mechanism and a fifth drying oven, wherein the unwinding and coating mechanism is used for conveying out a film to be coated and coating a first surface; the first drying oven is used for drying the film coated on the first surface; the surface changing mechanism is used for changing the surface of the film passing through the first drying oven to enable the second surface of the film to face upwards; the first drying oven is used for coating a first surface, the second drying oven is used for drying a film coated on a second surface, the winding mechanism is used for winding the film dried by the second drying oven, the first drying oven and the second drying oven are provided with a first drying tunnel and a second drying tunnel respectively, the first drying tunnel and the second drying tunnel are arranged side by side up and down, and the overall drying length is increased in a limited space, so that the space utilization rate of equipment is increased; under the action of the surface changing mechanism, the wet material can face upwards after the second surface is coated, so that the film can be better supported when the film is dried in the second drying oven, the shaking of the film is reduced, the density consistency of the dried film is ensured, and the production quality of the battery pole piece is improved.

Description

Technical Field

[0001] The utility model relates to the coating field, in particular to a return type coating machine. Background Art

[0002] In the prior art, the double-layer high-speed machine adopts an upper and lower layer structure, and the battery pole piece goes around the oven once. There are disadvantages such as many oven sections, large equipment size, high energy consumption, and large heat dissipation area. At the same time, when double-sided coating is performed, the wet material enters the oven with the wet side facing down after the second side is coated. This solution has major quality problems, the surface density consistency is difficult to ensure, and the coating speed cannot be increased. Utility Model Content

[0003] Based on this, it is necessary to provide a return coater to address the problems in the prior art.

[0004] A return coating machine, characterized in that it includes a roll-off coating mechanism for transferring the film to be coated and completing the first side coating,

[0005] The first oven is used to dry the film coated on the first side,

[0006] The surface changing mechanism is used to change the surface of the film passing through the first oven so that the second surface of the film faces upward.

[0007] A second coating mechanism is used to coat the second side of the film,

[0008] The second oven is used to dry the film coated on the second side,

[0009] The winding mechanism is used to wind up the film dried in the second oven.

[0010] The first oven and the second oven are respectively provided with a first drying channel and a second drying channel, the first drying channel and the second drying channel are arranged side by side up and down, and the first oven and the second oven are arranged side by side up and down.

[0011] In one embodiment, the unwinding and coating mechanism is located on the side of the first oven, the winding mechanism is located on the side of the second oven, and the unwinding and coating mechanism and the winding mechanism are arranged vertically on the same side of the first oven or the second oven.

[0012] In one embodiment, the first oven and the second oven are both provided with folding and correcting devices on their sides, and the films in the first oven and the second oven respectively pass through the folding and correcting devices from the first drying channel into the second drying channel.

[0013] In one embodiment, the folding and correcting device comprises a correcting motor, the shaft of which is respectively connected with an upper folding roller and a lower folding roller, the upper folding roller is flush with the first drying tunnel, and the lower folding roller is flush with the second drying tunnel.

[0014] In one embodiment, the first drying tunnel comprises a plurality of first conveying rollers arranged in parallel, the film in the first drying tunnel is located at an upper position of the first conveying rollers, a first lower blowing nozzle is provided at a lower side of the film in the first drying tunnel, the first lower blowing nozzle and the first conveying rollers are alternately distributed, and a first upper blowing nozzle and a first upper return air nozzle are alternately distributed at an upper side of the film in the first drying tunnel.

[0015] In one embodiment, the first upper blowing nozzle and the first conveying roller are disposed on both sides of the film in a corresponding manner, and the first upper return nozzle and the first lower blowing nozzle are disposed on both sides of the film in a corresponding manner.

[0016] In one embodiment, the second drying tunnel comprises a plurality of second conveying rollers arranged in parallel, the film in the second drying tunnel is located at a lower side of the second conveying rollers, a second suction box is provided on the upper side of the film in the second drying tunnel, the second suction boxes and the second conveying rollers are alternately distributed, and a second lower air nozzle is provided on the lower side of the film in the second drying tunnel.

[0017] In one embodiment, the second air suction box and the second lower air nozzle are arranged on both sides of the film correspondingly in the upper and lower parts.

[0018] In one embodiment, the surface changing mechanism includes a double-layer bracket and a first film feed roller, a second surface changing roller, a third intermediate roller, a fourth intermediate roller, a fifth surface changing roller, and a sixth film outlet roller. The double-layer bracket includes a first bracket and a second bracket. The first film feed roller is located on the side of the first bracket, the second surface changing roller is located at the position of the first bracket, the second surface changing roller is tilted, the third intermediate roller is located on the side of the second bracket, the fourth intermediate roller is located on the side of the second bracket, the fifth surface changing roller is located on the second bracket, the fifth surface changing roller is tilted, the sixth film roller is located on the side of the second bracket, and the fifth surface changing roller is vertically arranged between the second surface changing roller.

[0019] In one embodiment, when the film enters the first oven and leaves the oven after the first side coating and the second side coating are completed, the wet material of the film faces upward.

[0020] In the above-mentioned return coater, the first oven and the second oven are both provided with the first drying channel and the second drying channel, and the first drying channel and the second drying channel are arranged in parallel up and down, which increases the overall length of the drying in a limited space, thereby increasing the space utilization rate of the equipment. Under the action of the surface changing mechanism, the wet material can face upward after coating on the second side, so that when drying in the second oven, better support can be formed for the film, thereby reducing the shaking of the film, ensuring the density consistency of the film after drying, and thus improving the production quality of battery electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the folding coating machine of the utility model;

[0022] Figure 2 for Figure 1 The enlarged diagram of the structure at A in the middle;

[0023] Figure 3 for Figure 1 The enlarged diagram of the structure at B in the middle;

[0024] Among them, 1. unwinding and coating mechanism; 2. first oven; 21. first drying tunnel; 22. second drying tunnel; 211. first conveying roller; 212. first lower blowing nozzle; 213. first upper return nozzle; 214. first upper blowing nozzle; 221. second conveying roller; 222. second suction box; 223. second lower nozzle; 3. face-changing mechanism; 31. first bracket; 32. second bracket; 33. first film-feeding roller; 34. second face-changing roller; 35. third intermediate roller; 36. fourth intermediate roller; 37. fifth face-changing roller; 38. sixth film-discharging roller; 4. second coating mechanism; 5. second oven; 6. winding mechanism; 7. folding and correcting device; 71. upper folding roller; 72. lower folding roller. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] like Figures 1 to 3As shown, a return coating machine is characterized in that it includes an unwinding coating mechanism 1 for transferring the film to be coated and completing the first side coating.

[0029] The first oven 2 is used to dry the film coated on the first side,

[0030] The surface changing mechanism 3 is used to change the surface of the film passing through the first oven 2 so that the second surface of the film faces upward.

[0031] The second coating mechanism 4 is used to coat the second side of the film,

[0032] The second oven 5 is used to dry the film coated on the second side.

[0033] The winding mechanism 6 is used to wind up the film dried in the second oven 5.

[0034] The first oven 2 and the second oven 5 are respectively provided with a first drying channel 21 and a second drying channel 22. The first drying channel 21 and the second drying channel 22 are arranged side by side up and down. The first oven 2 and the second oven 5 are arranged side by side up and down.

[0035] The first oven 2 and the second oven 5 are both provided with a first drying channel 21 and a second drying channel 22. At the same time, the first drying channel 21 and the second drying channel 22 are arranged in parallel up and down, so as to increase the overall drying length in a limited space, thereby increasing the space utilization rate of the equipment. Under the action of the surface changing mechanism 3, the wet material can face upward after coating on the second side, so that when drying in the second oven 5, better support can be formed for the film, thereby reducing the shaking of the film, ensuring the density consistency of the film after drying, and thus improving the production quality of battery pole pieces.

[0036] At this time, in order to reduce the footprint, in this embodiment, the unwinding coating mechanism 1 is located on the side of the first oven 2, the winding mechanism 6 is located on the side of the second oven 5, and the unwinding coating mechanism 1 and the winding mechanism 6 are arranged on the same side of the first oven 2 or the second oven 5. Specifically, a two-layer structure is set, one layer is the unwinding coating mechanism 1 and the first oven 2, and the other layer is the winding mechanism 6 and the second oven 5. In this way, when the first oven 2 and the second oven 5 are the same length, the two-layer distribution method is adopted, which can increase the overall space utilization, thereby reducing the footprint, thereby reducing the equipment layout space requirements of the enterprise.

[0037] Since the first oven 2 and the second oven 5 are both provided with the first drying channel 21 and the second drying channel 22, and the first drying channel 21 and the second drying channel 22 are arranged in parallel up and down, when the film enters the second drying channel 22 from the first drying channel 21, it is necessary to turn the film for transmission. Specifically, in the present embodiment, the sides of the first oven 2 and the second oven 5 are both provided with a folding and correcting device 7, and the films in the first oven 2 and the second oven 5 enter the second drying channel 22 from the first drying channel 21 through the folding and correcting device 7 respectively.

[0038] Specifically, the folding and correcting device 7 includes a correcting motor, and the shaft of the correcting motor is connected to an upper folding roller 71 and a lower folding roller 72, respectively. The upper folding roller 71 is flush with the first drying tunnel 21, and the lower folding roller 72 is flush with the second drying tunnel 22. By setting the upper folding roller 71 and the lower folding roller 72, the film in the first drying tunnel 21 is transferred to the second drying tunnel 22. At this time, the upper folding roller 71 is flush with the first conveying roller 211 of the first drying tunnel 21, the lower folding roller 72 is flush with the second conveying roller 221 in the second drying tunnel 22, and the outer sides of the upper folding roller 71 and the lower folding roller 72 are flush, so that the film passes through the upper folding roller 71 and the lower folding roller 72 in the first drying tunnel 21 and enters the second drying tunnel 22.

[0039] For the first drying tunnel 21, when the film enters, the coated wet material faces upward. In order to ensure the drying efficiency and the stability of the film in the first drying tunnel 21, in this embodiment, the first drying tunnel 21 includes a plurality of parallel first conveying rollers 211, and the film in the first drying tunnel 21 is located on the upper side of the first conveying rollers 211. A first lower blowing nozzle 212 is provided on the lower side of the film in the first drying tunnel 21, and the first lower blowing nozzle 212 is alternately distributed with the first conveying rollers 211. An alternately distributed first upper blowing nozzle 214 and a first upper return nozzle 213 are provided on the upper side of the film in the first drying tunnel 21. Further, the first upper blowing nozzle 214 and the first conveying roller 211 are arranged on both sides of the film in correspondence with each other, and the first upper return nozzle and the first lower blowing nozzle 212 are arranged on both sides of the film in correspondence with each other. At this time, the film is located on the upper side of the first conveying roller 211 in the first drying tunnel 21, so that the film entering the first drying tunnel 21 is initially wetted upward, and the first upper blowing nozzle 214 can accelerate the drying process of the film surface. At the same time, the first upper return air nozzle 213 and the first lower blowing nozzle 212 can ensure that the film is stably transported in the first drying tunnel 21.

[0040] The second drying tunnel 22 is mainly used to increase the drying effect. At the same time, in order to ensure the stability of the film conveyed in the second drying tunnel 22, in this embodiment, the second drying tunnel 22 includes a plurality of parallel second conveying rollers 221. The film in the second drying tunnel 22 is located at the lower side of the second conveying rollers 221. A second suction box 222 is provided on the upper side of the film in the second drying tunnel 22. The second suction boxes 222 and the second conveying rollers 221 are alternately distributed. A second lower air nozzle 223 is provided on the lower side of the film in the second drying tunnel 22. Further, the second suction box 222 and the second lower air nozzle 223 are correspondingly arranged on both sides of the film.

[0041] After the first side of the film is dried, the film needs to be turned over so that the wet side of the film faces upward after coating. Therefore, in this embodiment, in order to change the surface of the film, the surface changing mechanism 3 includes a double-layer bracket and a first film-feeding roller 33, a second surface-changing roller 34, a third intermediate roller 35, a fourth intermediate roller 36, a fifth surface-changing roller 37, and a sixth film-exiting roller 38. The double-layer bracket includes a first bracket 31 and a second bracket 32. The first film-feeding roller 33 is located on the side of the first bracket 31, the second surface-changing roller 34 is located at the position of the first bracket 31, and the second surface-changing roller 34 is tilted. The third intermediate roller 35 is located on the side of the second bracket 32, and the fourth intermediate roller 36 is located on the side of the second bracket 32. The fifth surface-changing roller 37 is located at the position of the second bracket 32, and the fifth surface-changing roller 37 is tilted. The sixth film roller is located on the side of the second bracket 32, and the fifth surface-changing roller 37 is vertically arranged between the second surface-changing roller 34. At this time, the first bracket 31 and the second bracket 32 ​​are arranged in parallel, and the first bracket 31 and the second bracket 32 ​​are rectangular as a whole (preferably square), the first film feeding roller 33 is arranged on the side of the first bracket 31, and is used to guide the film into the second face-changing roller 34, the second face-changing roller 34 is arranged obliquely, specifically, the second face-changing roller 34 is inclined at 45° (the angle between the second face-changing roller 34 and the other two sides of the first bracket 31 is 45°), and the third intermediate roller 35 is arranged on the side of the first bracket 31. At this time, the first film feeding roller 33 and the third intermediate roller 35 are respectively located at two adjacent side positions of the first bracket 31, and the film guided out from the second face-changing roller 34 passes through the third intermediate roller 35, and then enters the fourth intermediate roller 36 on the side of the second bracket 32 ​​upward. The fifth face-changing roller 37 is inclined in the middle of the second bracket 32, and the fifth face-changing roller 37 is inclined at 45° (the angle between the two side edges of the second bracket 32 ​​is 45°). The film exported by the fourth intermediate roller 36 passes through the fifth face-changing roller 37, and then is exported from the fifth face-changing roller 37 to the sixth film-exiting roller 38. Similarly, the fourth intermediate roller 36 and the sixth film-exiting roller 38 are located at adjacent side edges of the second bracket 32, and the sixth film-exiting roller 38 and the first film-feeding roller 33 are located at two side positions opposite to the first bracket 31 or the second bracket 32. In this way, under the action of the face-changing mechanism 3, the film can be turned over, and the side of the film that needs to be coated for the second time can be facing upwards. In this way, after the coating on the second side is completed, the wet film can enter the second drying oven 5 with the wet film facing upwards.

[0042] In the first oven 2 and the second oven 5, when the film is coated on the first side and the second side and enters the first oven 2 and the oven, the wet material of the film faces upwards, which can ensure the drying quality and reduce the influence of the oven on the film.

[0043] The unwinding coating mechanism 1, the second coating mechanism 4 and the winding mechanism 6 involved in this embodiment adopt the existing technical solutions, so they are not described in detail here.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A return coater, characterized in that: It includes a roll-off coating mechanism, which is used to transfer the film to be coated and complete the first side coating. The first oven is used to dry the film coated on the first side, The surface changing mechanism is used to change the surface of the film passing through the first oven so that the second surface of the film faces upward. A second coating mechanism is used to coat the second side of the film, The second oven is used to dry the film coated on the second side, The winding mechanism is used to wind up the film dried in the second oven. The first oven and the second oven are respectively provided with a first drying channel and a second drying channel, the first drying channel and the second drying channel are arranged side by side up and down, and the first oven and the second oven are arranged side by side up and down.

2. The folding coater according to claim 1, characterized in that: The unwinding coating mechanism is located at the side of the first oven, the winding mechanism is located at the side of the second oven, and the unwinding coating mechanism and the winding mechanism are arranged vertically on the same side of the first oven or the second oven.

3. The return coater according to claim 2, characterized in that: The first oven and the second oven are both provided with folding and correcting devices on their sides, and the films in the first oven and the second oven respectively pass through the folding and correcting devices from the first drying channel into the second drying channel.

4. The folding coater according to claim 3, characterized in that: The folding and correcting device comprises a correcting motor, the shaft of which is respectively connected with an upper folding roller and a lower folding roller, the upper folding roller is flush with the first drying tunnel, and the lower folding roller is flush with the second drying tunnel.

5. The return coater according to claim 4, characterized in that: The first drying tunnel comprises a plurality of first conveying rollers arranged in parallel, the film in the first drying tunnel is located at an upper position of the first conveying rollers, a first lower blowing nozzle is provided at a lower side of the film in the first drying tunnel, the first lower blowing nozzle and the first conveying rollers are alternately distributed, and a first upper blowing nozzle and a first upper return air nozzle are alternately distributed at an upper side of the film in the first drying tunnel.

6. The return coater according to claim 5, characterized in that: The first upper blowing nozzle and the first conveying roller are arranged on both sides of the film in a corresponding manner, and the first upper return nozzle and the first lower blowing nozzle are arranged on both sides of the film in a corresponding manner.

7. The return coater according to claim 4, characterized in that: The second drying tunnel comprises a plurality of second conveying rollers arranged in parallel, the film in the second drying tunnel is located at the lower side of the second conveying rollers, a second suction box is provided on the upper side of the film in the second drying tunnel, the second suction boxes and the second conveying rollers are alternately distributed, and a second lower air nozzle is provided on the lower side of the film in the second drying tunnel.

8. The return coater according to claim 7, characterized in that: The second air suction box and the second lower air nozzle are arranged on both sides of the film correspondingly up and down.

9. The folding coater according to claim 4, characterized in that: The surface changing mechanism includes a double-layer bracket and a first film-feeding roller, a second surface-changing roller, a third intermediate roller, a fourth intermediate roller, a fifth surface-changing roller, and a sixth film-exiting roller. The double-layer bracket includes a first bracket and a second bracket. The first film-feeding roller is located on the side of the first bracket, the second surface-changing roller is located on the position of the first bracket, the second surface-changing roller is tilted, the third intermediate roller is located on the side of the second bracket, the fourth intermediate roller is located on the side of the second bracket, the fifth surface-changing roller is located on the position of the second bracket, the fifth surface-changing roller is tilted, the sixth film-exiting roller is located on the side of the second bracket, and the fifth surface-changing roller is vertically arranged between the second surface-changing roller.

10. The return coater according to any one of claims 1 to 9, characterized in that: When the film enters the first oven and leaves the oven after the first side coating and the second side coating are completed, the wet material of the film faces upward.

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