Turn-back type drying device and coating machine

Abstract

The utility model discloses a turn-back type drying device and a coating machine. The turn-back type drying device comprises a feeding mechanism, a receiving mechanism and a drying oven, the drying oven comprises an oven body, a first air blowing device, a second air blowing device, an isolation plate and a plurality of passing rollers. The discharging mechanism is used for discharging materials, the passing rollers are used for jointly supporting the materials, and the receiving mechanism is used for winding the folded materials; the first air blowing device is located above the second air blowing device, the isolation plate and the multiple passing rollers are all arranged between the first air blowing device and the second air blowing device, a negative pressure cavity is formed in the isolation plate, and an air inlet and an air outlet which are communicated with the negative pressure cavity are formed in the isolation plate; the pole piece drying device mainly solves the technical problems that at present, pole pieces are prone to being scratched with an air nozzle and the temperature of the pole pieces is not uniform under the requirement that a turn-back type drying mode is adopted for the pole pieces and the drying temperatures of the upper and lower layers of pole pieces are not consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of drying devices, in particular to a return drying device and a coating machine. Background Art

[0002] At present, some materials (such as battery electrodes) need to undergo a drying process during the production process. Under the requirement of ensuring that the electrode has a sufficiently long drying area in the drying device and reducing the external volume of the drying device, the existing technology designs the electrode for foldable transmission, that is, the electrode will have two layers, upper and lower, during the transmission process, and the upper and lower layers of the electrode will be dried by the hot air blown out by the nozzle. More specifically, the temperatures for drying the upper and lower layers of electrode sheets are usually inconsistent. When the upper electrode sheet enters the oven from the outside and the lower electrode sheet is gradually transmitted to the outside, the temperature for drying the upper electrode sheet needs to be higher than the temperature for drying the lower electrode sheet. To ensure that both the upper and lower electrode sheets can be dried within their respective preset temperature ranges, the prior art usually sets a baffle between the upper and lower electrode sheets. In addition, the air outlet on the oven is set on the side wall of the box. On the one hand, this will cause uneven wind speed of the hot air in the oven, causing eddy currents, thereby causing the electrode sheet to shake easily. When the electrode sheet shakes severely, it will hit the air nozzle, causing the electrode sheet and the air nozzle to rub against each other, resulting in poor electrode performance. On the other hand, it will cause large temperature differences when drying the electrode sheet. Utility Model Content

[0003] The utility model aims to provide a return drying device and a coating machine, which mainly solves the technical problems that the electrode is easily scratched by the air nozzle and the temperature of the electrode is uneven when the electrode is dried in a return drying manner and the drying temperatures of the upper and lower layers of the electrode are inconsistent.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A return drying device comprises a material discharging mechanism, a material receiving mechanism and a drying oven;

[0006] The oven comprises a box body and a first blowing device, a second blowing device, an isolation plate and a plurality of rollers respectively connected to the box body; the material discharge mechanism is used to discharge the material, the plurality of rollers are used to jointly support the material, and the material collection mechanism is used to roll up the folded and returned material;

[0007] The first blowing device is located above the second blowing device, the first blowing device is used for blowing hot air downwards, and the second blowing device is used for blowing hot air upwards, the isolation plate and the plurality of rollers are arranged between the first blowing device and the second blowing device, a negative pressure cavity is provided in the isolation plate, and an air inlet and an air outlet respectively connected to the negative pressure cavity are provided on the isolation plate.

[0008] In one of the technical solutions, the isolation plate is provided with a plurality of avoidance grooves penetrating in the vertical direction, each of the rollers is accommodated in a corresponding one of the avoidance grooves, and the top surface of each of the rollers protrudes upward relative to the top surface of the isolation plate, and the bottom surface of each of the rollers protrudes downward relative to the bottom surface of the isolation plate.

[0009] In one of the technical solutions, the avoidance groove includes a first side wall and a second side wall, and there is a gap between the roller and the first side wall and the second side wall respectively, and the air inlet is correspondingly arranged in the first side wall and the second side wall.

[0010] In one of the technical solutions, the air inlet is provided on both the first side wall and the second side wall, at least one row of air outlets arranged in sequence is provided on the outer wall of the isolation plate, and one avoidance groove is provided between each adjacent two air outlets.

[0011] In one of the technical solutions, two rows of air outlets are arranged on the outer wall of the isolation plate, and the direction in which one row of air outlets points to the other row of air outlets is the same as the axial direction of the roller.

[0012] In one of the technical solutions, both the first side wall and the second side wall are arc surfaces that are concave in a direction away from the roller.

[0013] In one of the technical solutions, the first blowing device is provided with a plurality of first air nozzles which are arranged in sequence and spaced apart in the horizontal direction and all blow air downward; the second blowing device is provided with a plurality of second air nozzles which are arranged in sequence and spaced apart in the horizontal direction and all blow air upward; the projection of each avoidance groove in the vertical direction does not overlap with the projection of any first air nozzle / any second air nozzle in the vertical direction, so that each of the rollers is staggered in the horizontal direction relative to the first air nozzle and the second air nozzle.

[0014] In one of the technical solutions, a plurality of the rollers are arranged in sequence and spaced apart along the direction in which the material is discharged by the discharge mechanism.

[0015] In one of the technical solutions, the plurality of rollers are arranged in a straight line and spaced apart in sequence along the horizontal direction.

[0016] The present application also provides a coating machine, comprising a coating roller for coating a preset material onto the material and a return drying device as described in any of the above technical solutions.

[0017] Compared with the prior art, the folding drying device provided by the utility model has at least the following beneficial effects:

[0018] Before work, the material is discharged from the discharge mechanism, and then the discharged material is pulled into the oven and returned after passing through multiple rollers, and finally the returned material is wrapped around the receiving mechanism; during work, the receiving mechanism is started, and the electrode pieces are gradually discharged from the discharge mechanism and enter the oven, the first blowing device blows hot air to the upper surface of the upper electrode piece, and the second blowing device blows hot air to the lower surface of the lower electrode piece, so that the electrode piece can be finally dried, and the hot air blown by the first blowing device and the second blowing device will enter the internal negative pressure cavity from the air inlet on the isolation plate, and then be discharged to the preset area from the air outlet on the isolation plate. It can be seen that the isolation plate arranged between the first blowing device and the second blowing device in this scheme not only plays the role of separating the first blowing device and the second blowing device so that the upper and lower layers of pole pieces can be dried at different preset temperatures, but also plays the role of guiding hot air, so that the hot air blown out by the first blowing device and the second blowing device must enter the interior of the isolation plate between the first blowing device and the second blowing device before being discharged. Therefore, the hot air just blown out can enter the isolation plate relatively quickly, and the hot air just blown out will not flow irregularly in the oven to cause uneven internal wind speed and induce eddy current phenomenon, that is, the pole piece is not easy to be scratched by the air nozzle on the first blowing device and the air nozzle on the second blowing device, thereby improving the quality of the pole piece after drying; in addition, since the hot air must enter the interior of the isolation plate between the first blowing device and the second blowing device before being discharged and the upper and lower layers of pole pieces are also arranged between the first blowing device and the second blowing device, the temperature difference of each part of the upper pole piece is smaller, and the temperature difference of each part of the lower pole piece is also smaller, thereby further improving the quality of pole piece drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of a return drying device provided in Example 1 of the present application;

[0021] Figure 2 A front view of the isolation plate provided in Example 1 of the present application;

[0022] Figure 3 This is a diagram of the internal structure of the isolation plate provided in Example 1 of the present application;

[0023] Figure 4 for Figure 3 Cross-sectional view at AA in the middle.

[0024] Among them, the reference numerals in the figure are:

[0025] 1. Discharging mechanism; 2. Receiving mechanism; 3. Oven; 31. Box body; 32. First blowing device; 321. First air nozzle; 33. Second blowing device; 331. Second air nozzle; 34. Isolation plate; 341. Negative pressure chamber; 342. Air inlet; 343. Air outlet; 344. Avoiding groove; 3441. First side wall; 3442. Second side wall; 35. Over roller; 4. Pole piece; 41. Upper pole piece; 42. Lower pole piece. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] Embodiment 1

[0032] Please also read Figures 1 to 4The present embodiment provides a folding drying device, which mainly includes a feeding mechanism 1, a receiving mechanism 2 and an oven 3, wherein the oven 3 includes a box body 31 and a first blowing device 32, a second blowing device 33, an isolation plate 34 and a plurality of rollers 35 connected to the box body 31; wherein the feeding mechanism 1 and the receiving mechanism 2 are both prior arts, the feeding mechanism 1 is used to discharge materials, and the receiving mechanism 2 is used to automatically reel in materials, and the material to be dried in the present embodiment is taken as an example of the electrode sheet 4 of the battery, and the plurality of rollers 35 are arranged in sequence along the direction in which the feeding mechanism 1 discharges the material, and the plurality of rollers 35 are arranged in sequence along the direction in which the feeding mechanism 1 discharges the material, and the plurality of rollers 35 are used to jointly support the electrode sheet 4, in order to ensure that the electrode sheet 4 has a sufficiently long drying area and to minimize the volume of the oven 3, the electrode sheet 4 discharged from the feeding mechanism 1 is wound around the receiving mechanism 2 in a folding manner after bypassing the plurality of rollers 35, that is, an upper electrode sheet 41 and a lower electrode sheet 42 are provided in the oven 3. Among them, the first blowing device 32 is located above the second blowing device 33, and the first blowing device 32 is provided with a plurality of first wind nozzles 321 arranged in sequence along the horizontal direction, and all the first wind nozzles 321 are used to blow hot air downward to the upper pole piece 41; the second blowing device 33 is provided with a plurality of second wind nozzles 331 arranged in sequence along the horizontal direction, and all the second wind nozzles 331 are used to blow hot air upward to the lower pole piece 42, and the isolation plate 34 and the plurality of rollers 35 are arranged between the first blowing device 32 and the second blowing device 33, and a negative pressure cavity 341 is provided in the isolation plate 34, and an air inlet 342 and an air outlet 343 respectively connected to the negative pressure cavity 341 are provided on the isolation plate 34.

[0033] During operation, the collecting mechanism 2 is started, the electrode 4 will be gradually discharged from the discharging mechanism 1 and enter the oven 3, the first blowing device 32 blows hot air to the upper surface of the upper electrode 41, and the second blowing device 33 blows hot air to the lower surface of the lower electrode 42, so that the electrode 4 can be finally dried, and the hot air blown by the first blowing device 32 and the second blowing device 33 will enter the internal negative pressure chamber 341 from the air inlet 342 on the isolation plate 34, and then be discharged from the air outlet 343 on the isolation plate 34 to the preset area not facing the electrode 4, this preset area can still be inside the box body 31, and the preset area can also be outside air. It can be seen that the isolation plate 34 arranged between the first blowing device 32 and the second blowing device 33 in the present scheme not only plays the role of separating the first blowing device 32 and the second blowing device 33 so that the upper electrode piece 41 and the lower electrode piece 42 can be dried at different preset temperatures, but also plays the role of guiding hot air, so that the hot air blown out by the first blowing device 32 and the second blowing device 33 must enter the interior of the isolation plate 34 between the first blowing device 32 and the second blowing device 33 before being discharged. Therefore, the hot air just blown out can enter the isolation plate 34 relatively quickly, and the hot air just blown out will not flow irregularly in the oven 3 to cause eddy current phenomenon, that is, the upper electrode piece 41 is not easy to be scratched by the first air nozzle 321 on the first blowing device 32, and the lower electrode piece 42 is not easy to be scratched by the second air nozzle 331 on the second blowing device 33, thereby improving the quality of the electrode piece 4 after drying. In addition, since the hot air must enter the interior of the isolation plate 34 between the first blowing device 32 and the second blowing device 33 before it can be discharged and the upper pole piece 41 and the lower pole piece 42 are also arranged between the first blowing device 32 and the second blowing device 33, the temperature difference of each part of the upper pole piece 41 is smaller, and the temperature difference of each part of the lower pole piece 42 is also smaller, thereby further improving the drying quality of the pole piece 4.

[0034] As can be seen from the above paragraph, after adopting this solution, the pole piece 4 is not easy to be scratched by the first air nozzle 321 and the second air nozzle 331. Therefore, this solution can make the pole piece 4 closer to the first air nozzle 321 and the second air nozzle 331, so that the pole piece 4 is more stable during transmission. Since the transmission of the pole piece 4 is more stable, this solution can also cancel the traditional roller structure with a large wrap angle distribution. The multiple rollers 35 of this solution can be directly designed to be arranged in a straight line in the horizontal direction in sequence. This structure is simpler and more convenient to install.

[0035] In this embodiment, a plurality of avoidance grooves 344 penetrating in the vertical direction are provided on the isolation plate 34, and each roller 35 is accommodated in a corresponding avoidance groove 344, so that the top surface of each roller 35 can protrude upward relative to the top surface of the isolation plate 34, and the bottom surface of each roller 35 can protrude downward relative to the bottom surface of the isolation plate 34, so that each roller 35 can realize the function of supporting the pole piece 4 and guiding the pole piece 4 to gradually be rolled up toward the material receiving mechanism 2. Specifically, the avoidance groove 344 includes a first side wall 3441 and a second side wall 3442 relative to each other. There is a gap between the roller 35 and the first side wall 3441 and between the roller 35 and the second side wall 3442 so that the roller 35 can rotate normally. In addition, each avoidance groove 344 is provided with the above-mentioned air inlet 342 on the first side wall 3441 or the second side wall 3442. By designing the position of the air inlet 342 in this way, the temperature of the upper pole piece 41 and the lower pole piece 42 can be more uniform.

[0036] In this embodiment, the projection of the first air nozzle 321 in the vertical direction overlaps with the projection of the second air nozzle 331 in the vertical direction, and the projection of each avoidance groove 344 in the vertical direction does not overlap with the projection of any first air nozzle 321 / any second air nozzle 331 in the vertical direction, so that each roller 35 is staggered in the horizontal direction relative to the first air nozzle 321 and the second air nozzle 331, thereby improving the stability of the return transmission process of the pole piece 4.

[0037] In this embodiment, the first side wall 3441 and the second side wall 3442 of each avoidance groove 344 are provided with the above-mentioned air inlet 342, and the outer wall of the isolation plate 34 is provided with at least one row of air outlets 343 arranged in sequence, and one avoidance groove 344 is provided between two adjacent air outlets 343. With such a design, the flow path of the hot air can be further improved, thereby further improving the temperature uniformity of the upper pole piece 41 and the lower pole piece 42. In addition, the first side wall 3441 and the second side wall 3442 are both arc surfaces that are concave in the direction away from the roller 35, thereby accelerating the conduction of the hot air while ensuring that the negative pressure chamber 341 has a certain negative pressure function, so that the temperature of the pole piece 4 can have better uniformity.

[0038] In this embodiment, two rows of the above-mentioned air outlets 343 are arranged on the outer wall of the isolation plate 34, and the direction in which one air outlet 343 points to another air outlet 343 is the same as the axial direction of the roller 35. Such a design can further improve the flow path of the hot air, thereby further improving the temperature uniformity of the upper pole piece 41 and the lower pole piece 42.

[0039] Embodiment 2

[0040] This embodiment provides a coating machine, which includes a coating roller and the folding drying device described in the first embodiment. The coating roller is used to coat the preset material on the surface of the material. After the coating is completed, the material is dried in the oven 3 to completely solidify the preset material on the surface of the material. Finally, the material is automatically rolled up on the receiving mechanism 2. Since the coating machine of this embodiment adopts the above-mentioned folding drying device, the preset material on the surface of the material will not be scratched by the air nozzle and the temperature uniformity is extremely uniform, so that the coating machine can finally have better coating quality.

[0041] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A return drying device, characterized in that: It includes a material discharging mechanism, a material collecting mechanism and a drying oven; The oven comprises a box body and a first blowing device, a second blowing device, an isolation plate and a plurality of rollers respectively connected to the box body; the material discharge mechanism is used to discharge the material, the plurality of rollers are used to jointly support the material, and the material collection mechanism is used to roll up the folded and returned material; The first blowing device is located above the second blowing device, the first blowing device is used for blowing hot air downwards, and the second blowing device is used for blowing hot air upwards, the isolation plate and the plurality of rollers are arranged between the first blowing device and the second blowing device, a negative pressure cavity is provided in the isolation plate, and an air inlet and an air outlet respectively connected to the negative pressure cavity are provided on the isolation plate.

2. The folding drying device according to claim 1, characterized in that: The isolation plate is provided with a plurality of avoidance grooves penetrating in the vertical direction, each of the passing rollers is accommodated in a corresponding one of the avoiding grooves, and the top surface of each of the passing rollers protrudes upward relative to the top surface of the isolation plate, and the bottom surface of each of the passing rollers protrudes downward relative to the bottom surface of the isolation plate.

3. The return drying device according to claim 2, characterized in that: The avoidance groove includes a first side wall and a second side wall opposite to each other. There are gaps between the roller and the first side wall and the second side wall respectively. The air inlet is provided on at least one of the first side wall and the second side wall.

4. The folding drying device according to claim 3, characterized in that: The air inlet is disposed on the first side wall and the second side wall, at least one row of air outlets arranged in sequence and spaced apart is disposed on the outer wall of the isolation plate, and one avoidance groove is disposed between each adjacent two air outlets.

5. The folding drying device according to claim 4, characterized in that: Two rows of air outlets are arranged on the outer wall of the isolation plate, and the direction in which one row of air outlets points to the other row of air outlets is the same as the axial direction of the roller.

6. The folding drying device according to claim 4, characterized in that: The first side wall and the second side wall are both arc surfaces that are concave in a direction away from the roller.

7. The folding drying device according to claim 2, characterized in that: The first blowing device is provided with a plurality of first air nozzles which are arranged in sequence and spaced apart in the horizontal direction and all blow air downwards; the second blowing device is provided with a plurality of second air nozzles which are arranged in sequence and spaced apart in the horizontal direction and all blow air upwards; the projection of each avoidance groove in the vertical direction does not overlap with the projection of any first air nozzle / any second air nozzle in the vertical direction, so that each of the rollers is staggered in the horizontal direction relative to the first air nozzle and the second air nozzle.

8. The folding drying device according to claim 1, characterized in that: The plurality of rollers are sequentially arranged at intervals along the direction in which the material discharge mechanism discharges the material.

9. The folding drying device according to claim 8, characterized in that: The plurality of rollers are arranged in a straight line and spaced in sequence along the horizontal direction.

10. A coating machine, characterized in that: It comprises a coating roller for coating the material with a preset material and the return drying device according to any one of claims 1 to 9.

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