Coulter drying equipment

Abstract

The coulter drying device comprises a drying cylinder and a coulter installed in the drying cylinder, the coulter comprises a tail portion and a head portion, an arc-shaped bottom face is arranged between the tail portion and the head portion, and the bending direction of the bottom face is consistent with the inner wall of the drying cylinder. The distance between the tail and the inner wall is set to be h1, and the distance between the head and the inner wall is set to be h2; h1 and h2 meet the condition that h1 > h2 > 0. According to the coulter drying equipment, when the distance between the head and the tail of the coulter and the inner wall of the drying cylinder meets the limitation, the distance between the head and the inner wall of the drying cylinder is smaller than the distance between the tail and the inner wall of the drying cylinder, the head of the coulter is in a sinking state, materials can be turned up more easily, and the drying efficiency is improved. And the distance between the tail part of the coulter and the inner wall of the drying cylinder is increased, and the coulter is in a raising state, so that the overstock and rubbing between the coulter and the materials during the operation of the coulter are reduced, and the generation of fine powder is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment, and more specifically to a plowshare drying equipment. Background Art

[0002] Ploughshare dryers are widely used in the production of lithium battery positive electrode materials due to their high drying efficiency. However, during the drying process, the existing ploughshare heads have an unreasonable design of the distance between the bottom surface of the ploughshare head and the wall of the drying cylinder. The head and tail of the cutter head are at the same distance from the cylinder wall, that is, the bottom surface and the cylinder wall are always parallel. The distance between the bottom surface and the cylinder wall is usually 10mm. However, during operation, the material between the ploughshare head and the cylinder wall will cause backlog and friction, resulting in an increase in fine powder in the product, which in turn affects the overall performance of the battery end.

[0003] Therefore, how to provide a plowshare drying device that reduces the generation of fine powder has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] The utility model aims to provide a plowshare drying device which can reduce the generation of fine powder.

[0005] The utility model provides a plowshare drying device, comprising a drying cylinder and a plowshare installed inside the drying cylinder: the plowshare comprises a tail portion and a head portion, an arc-shaped bottom surface is provided between the tail portion and the head portion, and a bending direction of the bottom surface is consistent with an inner wall of the drying cylinder; the distance between the tail portion and the inner wall is set to h1, and the distance between the head portion and the inner wall is set to h2; then h1 and h2 satisfy: h1>h2>0.

[0006] Optionally, the value range of h1:h2 is between 3:2 and 10:2.

[0007] Optionally, the value range of h2 is between 5mm-15mm; the value range of h1 is between 15mm-50mm.

[0008] Optionally, h2=10 mm, h1=15 mm.

[0009] Optionally, the cross-section of the plow is in the shape of a human figure, with the head located at the tip of the human figure and the tail located at the expanded end of the human figure. The plow has a top surface opposite to the bottom surface, and the side edges of the top surface extend toward the bottom surface to form a plow surface; wherein the orthographic projection of the top surface is located inside the contour line of the bottom surface.

[0010] Optionally, the top surface and the bottom surface are similar in shape and are coaxially arranged.

[0011] Optionally, the plow surface is an arc surface that is recessed toward the inside of the plow, and the plow surface and the bottom surface form an upturned blade portion.

[0012] Optionally, the two plow blades intersect at the head to form a front edge extending from the bottom head to the top head, and the front edge is in a concave arc shape.

[0013] Optionally, the surface of the plowshare head has a wear-resistant welding layer, and the thickness of the wear-resistant welding layer is 3mm-5mm.

[0014] Optionally, the material of the wear-resistant welding layer is selected from tungsten carbide.

[0015] According to the technical content disclosed in the utility model, the following beneficial effects are achieved:

[0016] The plowshare drying equipment provided by the utility model has an arc-shaped bottom surface between the tail and the head. At the tail position, the distance between the bottom surface and the inner wall of the drying cylinder is h1; at the head position, the distance between the bottom surface and the inner wall of the drying cylinder is h2; the relationship between h1 and h2 satisfies: h1>h2>0. When the distance between the head and tail of the plowshare and the side wall of the cylinder meets the above definition, the distance between the head and the cylinder wall is smaller than the distance between the tail and the cylinder wall, the head of the plowshare is in a sinking state, which makes it easier to turn up the material, and the distance between the tail of the plowshare and the cylinder wall becomes larger, showing an upward state, thereby reducing the backlog and friction between the plowshare and the material during operation, and effectively reducing the generation of fine powder.

[0017] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0019] Figure 1 This is a structural diagram of the plowshare drying equipment of the utility model.

[0020] Figure 2 This is a schematic diagram of the installation of the plow blade of the utility model.

[0021] Figure 3 This is a schematic diagram of the plow structure of the utility model.

[0022] Figure 4 Another structural schematic diagram of the plowshare of the utility model.

[0023] Explanation of the reference numerals: 1. drying cylinder; 2. main shaft; 3. plow arm; 4. plow; 41. head; 42. tail; 43. plow surface; 4301. front edge; 44. bottom side; 45. top surface; 4501. top side; 4502. top bottom; 4503. notch. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0026] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0027] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0028] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] See also Figure 1 The utility model discloses a plowshare drying device, comprising a drying cylinder 1 and a plowshare 4 installed inside the drying cylinder 1. A main shaft 2 is concentrically arranged inside the drying cylinder 1, and a plurality of plowshares 4 are fixed to the outer periphery of the main shaft 2 through a plurality of plowshare arms 3. Specifically, the plowshares 4 are installed on the main shaft 2 through the plowshare arms 3 and serve as a half structure for easy disassembly and assembly. When working, the plowshares 4 rotate around the main shaft according to the rotation of the plowshare arms 3. Figure 2 As shown, the material in the drying cylinder 1 moves in a clockwise circular motion, and the material in the drying cylinder 1 is diverted into two directions by the blade surface of the coulter 4 to form a bidirectional material flow, which intersects with the material diverted by the coulters 4 on both sides to form convection, and evenly disperses the material with high humidity, thereby achieving fast and efficient drying.

[0030] Combination Figure 2 and Figure 3The plow blade 4 includes a head 41 and a tail 42 arranged in the swinging direction, and a bottom surface (not shown in the figure) arranged opposite to the inner wall of the drying cylinder 1. The bottom surface is a downwardly convex arc surface structure, and the bending direction of the bottom surface is consistent with the bending direction of the inner wall of the drying cylinder, so that the distance between the bottom surface and the inner wall of the drying cylinder changes more evenly, and the increased effective area of ​​the bottom surface improves the work efficiency; at the position of the tail 42, the distance between the bottom surface and the inner wall of the drying cylinder is h1; at the position of the head 41, the distance between the bottom surface and the cylinder wall is h2; the relationship between h1 and h2 satisfies: h1>h2>0. The distance between the bottom surface and the inner wall of the drying cylinder gradually increases from the head 41 to the tail 42. When the distance between the head 41 and the tail 42 of the plow 4 and the inner wall of the drying cylinder meets the above-mentioned limitation, the distance between the head 41 and the inner wall of the drying cylinder is smaller than the distance between the tail 42 and the inner wall of the drying cylinder, and the head 41 of the plow 4 is in a sunken state, making it easier to turn over the material, while the distance between the tail 42 of the plow 4 and the inner wall of the drying cylinder becomes larger, presenting an upward state, thereby reducing the backlog and friction between the plow 4 and the material during operation, and effectively reducing the generation of fine powder.

[0031] Furthermore, the value range of h1:h2 is between 3:2 and 10:2, the value range of h2 is between 5mm-15mm, and the value range of h1 is between 15mm-50mm, which has the best effect and produces the least subdivision. In this embodiment, h2=10mm, h1=15mm.

[0032] The cross section of the plow blade 4 is in the shape of a human figure, the head 41 is located at the tip of the human figure, the tail 42 is located at the expanded end of the human figure, the plow blade 4 has a top surface 45 opposite to the bottom surface, and the side of the top surface 45 extends toward the bottom surface to form a plow blade surface 43; wherein the orthographic projection of the top surface 45 is located inside the contour line of the bottom surface. The top surface 45 and the bottom surface are similar in shape and are coaxially arranged.

[0033] Specifically, combined Figure 3 The plow 4 also includes a top surface 45 and a plow surface 43 connected between the top surface 45 and the bottom surface. The top surface 45 and the bottom surface are similar to an isosceles triangle in a top-down view. The two waists of the isosceles triangle are slightly bent toward the inside of the triangle. The top surface 45 and the bottom surface are both symmetrical structures. In a top-down view: the two top surface side edges 4501 are symmetrical to each other, and the two bottom surface side edges 44 are symmetrical to each other. The area of ​​the top surface 45 is smaller than that of the bottom surface, and the outer contour line of the bottom surface surrounds the outer contour line periphery of the top surface 45.

[0034] Furthermore, from a top view perspective: the top surface 45 includes a top surface bottom edge 4502 and two top surface side edges 4501, one ends of the two top surface side edges 4501 intersect at the head 41, and extend from the head 41 to the tail 42, and the two ends of the extension of the top surface bottom edge 4502 are respectively connected to the other ends of the two top surface side edges 4501; the two top surface side edges 4501 extend along a curve, and the convex direction of the curve is toward the center of the top surface 45; the bottom surface includes a bottom surface bottom edge and two bottom surface side edges 44, one ends of the two bottom surface side edges 44 intersect at the head 41, and extend from the head 41 to the tail 42, and the two ends of the extension of the bottom surface bottom edge are respectively connected to the other ends of the two bottom surface side edges 44; the two bottom surface side edges 44 extend along the curve, and the convex direction of the curve is toward the center of the bottom surface.

[0035] Furthermore, the plow surface 43 is an arc surface that is recessed toward the inside of the plow 4, and an upturned blade portion is formed at the intersection of the plow surface 43 and the top surface 45. The plow surface 43 of the plow 4 forms an upturned blade portion, which is conducive to breaking up the material, avoiding accumulation, and further reducing the generation of fine powder.

[0036] Furthermore, the two plowshare surfaces 43 intersect at the head 41 to form a front edge 4301 extending from the bottom head 41 to the top head 45 , and the front edge 4301 is in a concave arc shape, so that the plowshare 4 can more easily split the accumulated layer of materials.

[0037] Combination Figure 4 In some embodiments, the tail 42 of the plow 4 includes two notches 4503 located on both sides of its width and recessed from the top surface 45 to the bottom surface; the setting of the notches 4503 can reduce the resistance of the plow 4 when it is working, thereby improving the breaking up effect.

[0038] Combination Figure 4 Due to the particularity of lithium battery positive electrode materials, the use of stainless steel plowshare heads will greatly increase the metal impurity content of lithium battery materials. Using positive electrode materials with high metal content to make batteries may cause self-discharge, battery heating, and explosion and combustion. Therefore, lithium battery customers have very strict requirements for the control of metal impurities in materials. Therefore, the plowshare of the utility model is made of 304 stainless steel, and the surface of the plowshare 4 is provided with a wear-resistant welding layer. The wear-resistant welding layer is a tungsten carbide welding layer or a ceramic coating. The tungsten carbide welding layer is fixed to the surface of the plowshare 4 by laser surfacing or supersonic flame spraying. The thickness of the tungsten carbide welding layer is 3mm-5mm. After working for a long time, the plowshare will be greatly worn. The stainless steel impurities that are worn away are mixed in the positive electrode material powder. The iron content in stainless steel is as high as 70%, which causes serious pollution to the positive electrode material powder. When a wear-resistant isolation coating is set on the surface of the plowshare, the introduction of impurities caused by stainless steel wear is reduced, and the battery self-discharge ratio is greatly reduced.

[0039] In summary, the plow blade drying equipment provided by the utility model increases the service life by covering the surface of the plow blade 4 with a tungsten carbide coating. According to the Mohs hardness standard, the hardness of tungsten carbide is between 8.5 and 9.5. The Vickers hardness of tungsten carbide is very high, which can reach 1800HV, so it is a very hard and wear-resistant material. Laser welding is used to weld a 3-5mm thick tungsten carbide welding layer on the surface of the 304 stainless steel plow blade 4. The tungsten carbide welding layer can greatly reduce the wear of the plow blade 4 and avoid the problem of introducing metal foreign matter into the positive electrode material. When the plow blade 4 is not worn, the distance between the plow blade 4 and the inner wall of the drying cylinder will not increase, which reduces the generation of scarring material, keeps the heat conduction in the optimal state, reduces steam waste, reduces the frequency of blade replacement, and reduces maintenance work. At the same time, the distance between the head and tail of the plow blade 4 and the inner wall of the drying cylinder was adjusted. In this application, the distance between the head and tail of the plow blade and the inner wall of the drying cylinder was adjusted from the original 10mm to 15mm, and the head of the plow blade maintained the original 10mm distance, so that the plow blade 4 and the inner wall of the drying cylinder formed an inclined surface with a larger angle, reducing the material backlog and rubbing of the plow blade 4 during operation, and effectively reducing the generation of fine powder. Through practice, it was found that the service life of the plow blade 4 increased from the original 1 month to more than 1 year, and the frequency of blade replacement and the number of times of cleaning the scarred material were also reduced by 90%, reducing 90% of material waste, reducing 90% of the production time delay caused by blade replacement, and reducing 50% of steam usage. Reduce the generation of fine powder by 50% and improve product quality.

[0040] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A plowshare drying device, comprising a drying cylinder and a plowshare installed inside the drying cylinder, characterized in that: The plow blade comprises a tail portion and a head portion, wherein an arc-shaped bottom surface is provided between the tail portion and the head portion, and the curvature direction of the bottom surface is consistent with the inner wall of the drying cylinder; The distance between the tail and the inner wall is set to h1, and the distance between the head and the inner wall is set to h2; then h1 and h2 satisfy: h1>h2>0.

2. The plowshare drying device according to claim 1, characterized in that: The value range of h1:h2 is between 3:2 and 10:

2.

3. The plowshare drying device according to claim 2, characterized in that: The value range of h2 is between 5mm-15mm; The value range of h1 is between 15mm-50mm.

4. The plowshare drying device according to claim 3, characterized in that: h2=10mm, h1=15mm.

5. The plowshare drying device according to any one of claims 1 to 4, characterized in that: The cross-section of the plow is in the shape of a human figure, the head is located at the tip of the human figure, the tail is located at the expansion end of the human figure, and the plow has a top surface opposite to the bottom surface, and the side of the top surface extends toward the bottom surface to form a plow surface; wherein the orthographic projection of the top surface is located inside the contour line of the bottom surface.

6. The plowshare drying device according to claim 5, characterized in that: The top surface and the bottom surface are similar in shape and are coaxially arranged.

7. The plowshare drying device according to claim 5, characterized in that: The plow surface is an arc surface that is recessed toward the inside of the plow, and the plow surface and the bottom surface form an upturned blade portion.

8. The plowshare drying device according to claim 7, characterized in that: The two plow blades intersect at the head to form a front edge extending from the bottom head to the top head, and the front edge is in a concave arc shape.

9. The plowshare drying device according to claim 1, characterized in that: The surface of the plowshare head has a wear-resistant welding layer, and the thickness of the wear-resistant welding layer is 3mm-5mm.

10. The plowshare drying device according to claim 9, characterized in that: The material of the wear-resistant welding layer is selected from tungsten carbide.

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