A coating device for the production and processing of lithium-ion battery separators

Abstract

The present invention discloses a coating device for the production and processing of lithium-ion battery diaphragms, which includes a rectangular oven. A first coating assembly is provided on one side of the rectangular oven, and a second coating assembly is installed in the middle of the rectangular oven. A unwind reel is provided on one side of the first coating assembly, and a wind-up reel is provided on one side of the second coating assembly. The film is sequentially fed into the first coating assembly and the second coating assembly through the unwind reel to continuously coat both surfaces. A number of first guide rollers and second guide rollers are respectively provided in the rectangular oven. The number of first guide rollers and second guide rollers are both spirally distributed, and the first guide rollers and the second guide rollers are symmetrically distributed in a double helix. The rotation of the guide rollers is used to realize the double-helix winding and multi-layer winding of the film in the rectangular oven. The heaters evenly distributed in a double helix make the air temperature in each part of the rectangular oven evenly distributed, ensuring the consistency and uniformity of the drying effect and improving the drying quality.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and specifically, it is a coating device for the production and processing of lithium-ion battery separators. Background Art

[0002] In the process of manufacturing lithium-ion batteries, it is necessary to uniformly coat electrode materials (such as positive or negative electrode materials) on separators or other substrates. Based on the research on the physical properties of fluids, the main process is to coat one or more layers of liquid on the substrate, and the substrate is usually a flexible film or backing paper. The coated liquid coating then undergoes a drying or curing process to form a film layer with specific functions.

[0003] The application document with the publication number CN115475735A discloses an extrusion coater for lithium battery production, including an oven, a first bracket, a second bracket, a material spreading roller, a first motor, a winding roller, and a second motor. The first bracket is arranged at the left end of the oven, the second bracket is arranged at the right end of the oven, the material spreading roller is rotatably installed at the rear side of the inner cavity of the first bracket, the first motor is fixedly installed at the rear side of the first bracket, and the output end of the first motor is fixedly connected to the rear end of the material spreading roller.

[0004] The above device has the following deficiencies. When the above device is in use, the drying time per unit area is short, the drying process is incomplete and insufficient, which easily causes the coating material to adhere to the outer surface of the processing components. Moreover, the space utilization efficiency of the above device is low, reducing the overall production and processing efficiency, having a large floor area, a narrow application range. At the same time, it is difficult for the above device to accurately and stably control the coating thickness, difficult to improve the overall quality of the product, and the material consumption is large. Summary of the Invention

[0005] The purpose of the present invention is to provide a coating device for the production and processing of lithium-ion battery separators to address the above-mentioned problems and deficiencies, and improve the overall working efficiency.

[0006] The present invention solves at least one of the following technical problems:

[0007] (1) When the above device is in use, the drying time per unit area is short, the drying process is incomplete and insufficient, which easily causes the coating material to adhere to the outer surface of the processing components;

[0008] (2) The space utilization efficiency of the above device is low, reducing the overall production and processing efficiency, having a large floor area, a narrow application range;

[0009] (3) It is difficult for the above device to accurately and stably control the coating thickness, difficult to improve the overall quality of the product, and the material consumption is large.

[0010] The object of the present invention can be achieved by the following technical solutions: A coating device for the production and processing of lithium-ion battery separators, including a rectangular oven. One side of the rectangular oven is provided with a first coating assembly, and the middle of the rectangular oven is installed with a second coating assembly. One side of the first coating assembly is provided with an unwinder, and one side of the second coating assembly is provided with a winder. The film is successively fed into the first coating assembly and the second coating assembly through the unwinder to continuously coat both surfaces. A number of first guide rollers and second guide rollers are respectively arranged in the rectangular oven. A number of first guide rollers and second guide rollers are all spirally distributed, and the first guide rollers and the second guide rollers are symmetrically distributed in a double helix.

[0011] As a further solution of the invention, both the first guide rollers and the second guide rollers are rotatably connected to the rectangular oven. A heater is provided between each layer of the first guide rollers and the second guide rollers. There are a number of heaters and they are symmetrically distributed in a double helix.

[0012] As a further solution of the invention, both the first coating assembly and the second coating assembly include a heat insulation box. A liquid storage hopper is provided on the lower side inside the heat insulation box. A first coating roller is provided on the liquid storage hopper of the first coating assembly, and a second coating roller is provided on the liquid storage hopper of the second coating assembly. A third guide roller is provided inside the heat insulation box.

[0013] As a further solution of the invention, the third guide roller is located on the right side of the first coating roller in the first coating assembly, and the third guide roller is located on the left side of the second coating roller in the second coating assembly. The film is coated with a first coating layer through the first coating roller, and the film is coated with a second coating layer through the second coating roller.

[0014] As a further solution of the invention, a fourth guide roller is provided directly above both the first coating roller and the second coating roller. A bearing slide is provided above the fourth guide roller, and a thickness adjustment assembly is provided above the bearing slide.

[0015] As a further solution of the invention, the thickness adjustment assembly includes an L-shaped bearing plate. An L-shaped scraper is slidably connected to one side of the L-shaped bearing plate. A limiting spring is provided between the upper end of the L-shaped scraper and the upper end of the L-shaped bearing plate, and the limiting spring is fixedly connected to both the L-shaped scraper and the L-shaped bearing plate.

[0016] As a further solution of the invention, the L-shaped bearing plate is perpendicular to the plane where the bearing slide is located.

[0017] As a further solution of the invention, a transmission roller is provided on one side of the L-shaped scraper. The transmission roller is rotatably connected to the heat insulation box. A first transmission tooth is fixedly connected to the side of the L-shaped scraper close to the transmission roller, and a second transmission tooth is fixedly connected to the side of the transmission roller close to the L-shaped scraper. The first transmission tooth meshes with the second transmission tooth.

[0018] As a further aspect of the invention, a transmission rotating rod is fixedly connected to the other side of the transmission roller. The transmission rotating rod is tangent to the side surface of the transmission roller and perpendicular to its axis. The upper end of the transmission rotating rod is fixedly connected with a transmission worm gear ring. The transmission worm gear ring is coplanar with the transmission rotating rod and coaxial with the transmission roller.

[0019] As a further aspect of the invention, the transmission worm gear ring is a quarter ring. The outer periphery of the transmission worm gear ring is provided with worm gear teeth. A support roller is provided on the lower side of the middle part of the transmission worm gear ring. The transmission worm gear ring is meshed with the support roller. A transmission worm is provided on the upper side of the middle part of the transmission worm gear ring. The transmission worm is meshed with the transmission worm gear ring for transmission. A counting support seat is installed at one end of the transmission worm, and a driving motor is installed at the other end of the transmission worm.

[0020] Advantages of the present invention:

[0021] (1) The materials coated on both side surfaces of the film are dried through the loop structure and the inner cavity of the loop oven. By virtue of the characteristic of the loop oven to make full use of space, on the premise of being fully heated and dried, its own size and floor area are greatly reduced, improving the space utilization efficiency. The first guide roller and the second guide roller are distributed in a double helix symmetry, so as to realize the double helix winding and multi-layer winding of the film in the loop oven by using the rotation direction of the guide rollers, enabling the materials on both sides of the film to fully absorb the heat of the heater, fully removing water from the materials, improving the drying effect, and increasing the drying duration of the film by increasing the number of spiral layers of the first guide roller and the second guide roller. In a limited space, the drying time per unit area is effectively extended, avoiding the phenomenon of material adhesion caused by insufficient drying duration. At the same time, the heaters distributed in a double helix and evenly make the air temperature in each part of the loop oven evenly distributed, so that the coated materials absorb heat evenly, avoiding the phenomenon of uneven temperature distribution caused by using air as the heat conductor, thus enabling the materials in each part to be quickly and evenly heated and dried, ensuring the consistency and uniformity of the drying effect and improving the drying quality;

[0022] (2) During operation, the third guide roller and the inlet end of the heat insulation box are located on both sides of the heat insulation box respectively and on the same side as the outlet end. By adjusting the position of the third guide roller, the left winding and right winding of the film are adjusted, so that different side surfaces of the film are respectively in contact with the first coating roller and the second coating roller. At the same time, the third guide roller and the fourth guide roller cooperate with each other to guide the winding and moving track of the film, so that the film is tangent to the first coating roller and the second coating roller respectively, so as to keep the coating amounts of the first coating layer and the second coating layer evenly distributed. It can not only adapt and adjust the coating sequence through simple conversion, but also clarify the track of the guiding film, further improving the coating quality;

[0023] (3)During operation, a large transmission ratio transmission structure with a labor-saving lever structure is formed by the transmission rotating rod, the transmission worm gear ring, and the transmission roller. This can not only reduce the power and energy consumption required by the driving motor, reduce the friction loss between the transmission worm and the transmission worm gear ring, and extend the service life of the transmission worm and the transmission worm gear ring, but also increase the transmission ratio through the transmission rotating rod, more accurately control the rotation angle of the transmission roller and the downward movement distance of the L-shaped scraper. It can not only independently and correspondingly adjust the thickness of the first coating layer and the second coating layer, but also improve the accuracy and uniformity of the thickness, improve the quality of the product, and the overall structure is compact with high space utilization. At the same time, the elastic force of the limit spring can be used to make the first transmission tooth and the second transmission tooth closely abut, or the position and gravity of the L-shaped scraper itself can be utilized to eliminate the transmission looseness caused by tolerances and improve the accuracy of thickness adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 Schematic diagram of the overall structure of the present invention;

[0026] Figure 2 Front view of the internal structure of the present invention;

[0027] Figure 3 Schematic diagram of the film conveying structure of the present invention;

[0028] Figure 4 Front view of the internal structure of the loop oven of the present invention;

[0029] Figure 5 Front view of the internal structure of the first coating assembly of the present invention;

[0030] Figure 6 Schematic diagram of the overall structure of the thickness adjustment assembly of the present invention;

[0031] In the figure: 101, loop oven; 102, first coating assembly; 103, second coating assembly; 104, unwind reel; 105, wind-up reel; 106, film; 201, first guide roller; 202, second guide roller; 203, heater; 301, first coating roller; 302, second coating roller; 303, first coating layer; 304, second coating layer; 401, heat insulation box; 402, filling hopper; 403, third guide roller; 404, fourth guide roller; 405, bearing slide; 501, L-shaped bearing plate; 502, L-shaped scraper; 503, limit spring; 504, first transmission tooth; 505, transmission roller; 506, second transmission tooth; 507, transmission rotating rod; 508, transmission worm gear ring; 509, support roller; 510, counting support seat; 511, driving motor; 512, transmission worm. Detailed implementation manners

[0032] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0033] Please refer to Figure 1-6 as shown in the figure: A coating device for the production and processing of a lithium-ion battery separator includes a rectangular oven 101. A first coating assembly 102 is provided on one side of the rectangular oven 101. A second coating assembly 103 is installed in the middle of the rectangular oven 101. A unwind reel 104 is provided on one side of the first coating assembly 102. A wind-up reel 105 is provided on one side of the second coating assembly 103. The film 106 is successively fed into the first coating assembly 102 and the second coating assembly 103 through the unwind reel 104 to continuously coat both surfaces. A number of first guide rollers 201 and second guide rollers 202 are respectively provided in the rectangular oven 101. The number of first guide rollers 201 and second guide rollers 202 are both spirally distributed, and the first guide rollers 201 and the second guide rollers 202 are symmetrically distributed in a double helix. The first guide rollers 201 and the second guide rollers 202 are both rotatably connected to the rectangular oven 101. A heater 203 is provided between each layer of the first guide rollers 201 and the second guide rollers 202. The number of heaters 203 is several and they are symmetrically distributed in a double helix;

[0034] When this embodiment works, the wound film 106 is evenly output through the unwind reel 104, and the film 106 with both sides coated and dried is evenly wound up through the cooperation of the wind-up reel 105 and the unwind reel 104. The film 106 first passes through the first coating assembly 102 to coat one side well. Subsequently, the film 106 with one side coated with material enters the rectangular oven 101 and is continuously wound and tightened in a spiral shape under the guidance of the first guide rollers 201. At the same time, it absorbs the heat of the heater 203 in the rectangular oven 101 and dries the material. Then it passes through the second coating assembly 103 to coat the other side well. Subsequently, it enters the rectangular oven 101 again and is unwound in a spiral shape in the reverse direction under the guidance of the second guide rollers 202. It absorbs the heat of the heater 203 in the rectangular oven 101 again and dries the material on the other side. Then it leaves the rectangular oven 101 and is wound up by the wind-up reel 105.

[0035] Both the first coating assembly 102 and the second coating assembly 103 include a heat insulation box 401. A material storage hopper 402 is provided on the lower side inside the heat insulation box 401. A first coating roller 301 is provided on the material storage hopper 402 of the first coating assembly 102, and a second coating roller 302 is provided on the material storage hopper 402 of the second coating assembly 103. A third guide roller 403 is provided inside the heat insulation box 401. The third guide roller 403 is located on one side of the first coating roller 301 and on the other side of the second coating roller 302. In this embodiment, the third guide roller 403 is located on the right side of the first coating roller 301 inside the first coating assembly 102, and the third guide roller 403 is located on the left side of the second coating roller 302 inside the second coating assembly 103. The film 106 is coated with a first coating layer 303 through the first coating roller 301, and the film 106 is coated with a second coating layer 304 through the second coating roller 302. Fourth guide rollers 404 are provided directly above both the first coating roller 301 and the second coating roller 302. A carrying slide 405 is provided above the fourth guide rollers 404, and a thickness adjustment assembly is provided above the carrying slide 405;

[0036] When working in this embodiment, different sides of the film 106 are adjusted by the position of the third guide roller 403 inside the heat insulation box 401, so that the two sides of the film 106 correspond to the first coating roller 301 and the second coating roller 302 respectively. The film 106 is guided inside the heat insulation box 401 by the third guide roller 403 and the fourth guide rollers 404. At the same time, the fourth guide rollers 404 keep the film 106 evenly spaced from the first coating roller 301 and the second coating roller 302 respectively, so that the first coating layer 303 and the second coating layer 304 have a uniform thickness during coating. The carrying slide 405 supports and slides the film 106 coated on one side, facilitating the thickness adjustment assembly to adjust the thickness of the first coating layer 303 and the second coating layer 304.

[0037] The thickness adjustment assembly includes an L-shaped bearing plate 501 which is perpendicular to the plane where the bearing slide 405 is located. One side of the L-shaped bearing plate 501 is slidably connected with an L-shaped scraper 502. A limiting spring 503 is arranged between the upper end of the L-shaped scraper 502 and the upper end of the L-shaped bearing plate 501, and the limiting spring 503 is fixedly connected to both the L-shaped scraper 502 and the L-shaped bearing plate 501. One side of the L-shaped scraper 502 is provided with a driving roller 505 which is rotatably connected to the heat insulation box 401. A first transmission gear 504 is fixedly connected to the side of the L-shaped scraper 502 close to the driving roller 505, and a second transmission gear 506 is fixedly connected to the side of the driving roller 505 close to the L-shaped scraper 502. The first transmission gear 504 meshes with the second transmission gear 506. The other side of the driving roller 505 is fixedly connected with a transmission rotating rod 507. The transmission rotating rod 507 is tangent to the side surface of the driving roller 505 and perpendicular to its axis. The upper end of the transmission rotating rod 507 is fixedly connected with a transmission worm gear ring 508. The transmission worm gear ring 508 is coplanar with the transmission rotating rod 507 and coaxial with the driving roller 505. In this embodiment, the transmission worm gear ring 508 is a quarter ring, and the outer circumference of the transmission worm gear ring 508 is provided with worm gear teeth. A support roller 509 is arranged on the lower side of the middle part of the transmission worm gear ring 508. The transmission worm gear ring 508 meshes with the support roller 509. A transmission worm 512 is arranged on the upper side of the middle part of the transmission worm gear ring 508. The transmission worm 512 is in meshing transmission with the transmission worm gear ring 508. One end of the transmission worm 512 is provided with a counting support base 510, and the other end of the transmission worm 512 is provided with a driving motor 511;

[0038] During the operation of this embodiment, the thickness of the first coating layer 303 and the second coating layer 304 is controlled by the L-shaped scraper 502 sliding up and down on the side surface of the L-shaped bearing plate 501. The driving roller 505 rotates the second transmission gear 506, and through the meshing of the first transmission gear 504, the L-shaped scraper 502 is pushed to move up and down. Through the transmission rotating rod 507, the transmission worm gear ring 508 and the driving roller 505 form a large transmission ratio transmission structure of a labor-saving lever structure. The rotation of the transmission worm gear ring 508 is supported by the support roller 509. The rotation angle of itself is accurately adjusted through the worm and worm gear structure formed by the transmission worm 512 and the transmission worm gear ring 508, and then the moving distance of the L-shaped scraper 502 is accurately adjusted. At the same time, the limiting spring 503 eliminates the idle transmission caused by machining tolerances during the transmission process. The counting support base 510 not only counts and stores the rotation turns and angles of the transmission worm 512, but also supports it to ensure stable meshing transmission.

[0039] When the present invention is in use, the staff dries the materials coated on both sides of the film 106 through the loop structure and the inner cavity of the loop oven 101. By virtue of the characteristic of the loop oven 101 to make full use of space, its own size and floor area are greatly reduced on the premise of being fully heated and dried, improving the space utilization efficiency. The first guide roller 201 and the second guide roller 202 are arranged in a double-helix symmetric distribution, so as to realize the double-helix winding and multi-layer winding of the film 106 in the loop oven 101 by using the rotation direction of the guide rollers, enabling the materials on both sides of the film 106 to fully absorb the heat of the heater 203, fully remove water from the materials, improving the drying effect, and increasing the drying time of the film 106 by increasing the number of spiral layers of the first guide roller 201 and the second guide roller 202. In a limited space, the drying time per unit area is effectively extended, avoiding the phenomenon of material adhesion caused by insufficient drying time. At the same time, the heaters 203 evenly distributed in a double-helix manner make the air temperature evenly distributed everywhere in the loop oven 101, so that the coated materials absorb heat evenly, avoiding the phenomenon of uneven temperature distribution caused by using air as a heat conductor, so that the materials everywhere are quickly and evenly heated and dried, ensuring the consistency and uniformity of the drying effect and improving the drying quality;

[0040] During operation, the third guide roller 403 and the inlet end of the heat insulation box 401 are respectively located on both sides of the heat insulation box 401 and on the same side as the outlet end. By adjusting the position of the third guide roller 403, the left winding and right winding of the film 106 are adjusted, so that different sides of the film 106 are respectively in corresponding contact with the first coating roller 301 and the second coating roller 302. At the same time, the third guide roller 403 and the fourth guide roller 404 cooperate with each other to guide the winding movement track of the film 106, so that the film 106 is respectively tangent to the first coating roller 301 and the second coating roller 302, so as to keep the coating amounts of the first coating layer 303 and the second coating layer 304 evenly distributed. It can not only adapt and adjust the coating sequence through simple conversion, but also clearly guide the track of the film 106, further improving the coating quality;

[0041] During operation, a large transmission ratio transmission structure with a labor-saving lever structure is formed by the transmission rotating rod 507, the transmission worm gear ring 508 and the transmission drum 505, which can not only reduce the power and energy consumption required by the drive motor 511, reduce the friction loss between the transmission worm 512 and the transmission worm gear ring 508, and extend the service life of the transmission worm 512 and the transmission worm gear ring 508. At the same time, the transmission ratio is increased through the transmission rotating rod 507, and the rotation angle of the transmission drum 505 and the downward movement distance of the L-shaped scraper 502 are more accurately controlled. It can not only independently and correspondingly adjust the thickness of the first coating layer 303 and the second coating layer 304, but also improve the accuracy and uniformity of the thickness, improve the quality of the product, and the overall structure is compact with high space utilization. At the same time, the elastic force of the limit spring 503 can be used to make the first transmission gear 504 closely abut against the second transmission gear 506, or the position and gravity of the L-shaped scraper 502 itself can be used to eliminate the transmission looseness caused by tolerances and improve the accuracy of thickness adjustment.

[0042] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A coating device for producing and processing lithium-ion battery separators, characterized in that: A circular oven (101) is provided with a first coating assembly (102) on one side of the circular oven (101), a second coating assembly (103) is installed in the middle of the circular oven (101), a reel (104) is provided on one side of the first coating assembly (102), and a reel (105) is provided on one side of the second coating assembly (103), a film (106) is sequentially fed into the first coating assembly (102) and the second coating assembly (103) through the reel (104), so as to continuously coat the surfaces on both sides, a plurality of first guide rollers (201) and a second guide roller (202) are respectively provided in the circular oven (101), the plurality of first guide rollers (201) and the second guide rollers (202) are all distributed in a spiral, and the first guide rollers (201) and the second guide rollers (202) are symmetrically distributed in a double spiral.

2. A coating device for producing and processing lithium-ion battery separators according to claim 1, characterized in that: The first guide roller (201) and the second guide roller (202) are both rotatably connected to the circular oven (101), a heater (203) is provided between each layer of the first guide roller (201) and the second guide roller (202), and a plurality of heaters (203) are provided and are symmetrically distributed in a double helix shape.

3. A coating device for producing and processing lithium-ion battery separators according to claim 1, characterized in that: The first coating assembly (102) and the second coating assembly (103) both comprise a heat-insulating box (401); a containing bucket (402) is provided on the lower inner side of the heat-insulating box (401); a first coating roller (301) is provided on the containing bucket (402) of the first coating assembly (102); a second coating roller (302) is provided on the containing bucket (402) of the second coating assembly (103); and a third guide roller (403) is provided in the heat-insulating box (401).

4. A coating device for producing and processing lithium-ion battery separators according to claim 3, characterized in that: The third guide roller (403) is located on the right side of the first coating roller (301) in the first coating assembly (102), and the third guide roller (403) is located on the left side of the second coating roller (302) in the second coating assembly (103); the film (106) is coated with a first coating layer (303) by the first coating roller (301), and the film (106) is coated with a second coating layer (304) by the second coating roller (302).

5. A coating device for producing and processing lithium-ion battery separators according to claim 3, characterized in that: A fourth guide roller (404) is provided directly above the first coating roller (301) and the second coating roller (302), a bearing slide (405) is provided above the fourth guide roller (404), and a thickness adjustment component is provided above the bearing slide (405).

6. A coating device for producing and processing lithium-ion battery separators according to claim 5, characterized in that: The thickness adjustment component comprises an L-shaped bearing plate (501), one side of the L-shaped bearing plate (501) is slidably connected to an L-shaped scraper (502), a limit spring (503) is provided between the upper end of the L-shaped scraper (502) and the upper end of the L-shaped bearing plate (501), and the limit spring (503) is fixedly connected to both the L-shaped scraper (502) and the L-shaped bearing plate (501).

7. A coating device for producing and processing lithium-ion battery separators according to claim 6, characterized in that: The L-shaped bearing plate (501) is perpendicular to the plane where the bearing slide (405) is located.

8. A coating device for producing and processing lithium-ion battery separators according to claim 6, characterized in that: A transmission roller (505) is provided on one side of the L-shaped scraper (502); the transmission roller (505) is rotatably connected to the heat insulation box (401); a first transmission tooth (504) is fixedly connected to the side of the L-shaped scraper (502) close to the transmission roller (505); a second transmission tooth (506) is fixedly connected to the side of the transmission roller (505) close to the L-shaped scraper (502); and the first transmission tooth (504) is meshed with the second transmission tooth (506).

9. A coating device for producing and processing lithium-ion battery separators according to claim 8, characterized in that: A transmission rotating rod (507) is fixedly connected to the other side of the transmission roller (505); the transmission rotating rod (507) is tangent to the side surface of the transmission roller (505) and is perpendicular to the axis thereof; a transmission worm gear ring (508) is fixedly connected to the upper end of the transmission rotating rod (507); the transmission worm gear ring (508) is coplanar with the transmission rotating rod (507) and coaxial with the transmission roller (505).

10. A coating device for producing and processing lithium-ion battery separators according to claim 9, characterized in that: The transmission worm wheel ring (508) is a quarter-circle ring, and worm gears are arranged on the outer periphery of the transmission worm wheel ring (508). A support roller (509) is arranged on the lower middle side of the transmission worm wheel ring (508), and the transmission worm wheel ring (508) meshes with the support roller (509). A transmission worm (512) is arranged on the upper middle side of the transmission worm wheel ring (508), and the transmission worm (512) meshes with the transmission worm wheel ring (508) for transmission. A counting support seat (510) is installed at one end of the transmission worm (512), and a driving motor (511) is installed at the other end of the transmission worm (512).

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