Corona roller for aluminum foil carbon coating unit

Abstract

The corona roller comprises a roller body, a driven side flange and a transmission side flange are installed on the left side and the right side of the roller body respectively, a driven shaft head is installed on the outer surface of the driven side flange, a water through hole is formed in the driven shaft head, and the water through hole is communicated with the interior of the roller body. A water inlet pipe is inserted into the water through hole, a gap is reserved between the outer surface of the water inlet pipe and the inner wall of the water through hole, and a water cooling mechanism is arranged in the roller body. The roller body comprises a roller body base body, a transition layer and a working layer, the transition layer is arranged on the outer surface of the roller body base body, and the working layer is arranged on the outer surface of the transition layer. The surface wear resistance, burr accumulation resistance, insulativity and heat dissipation performance of the corona roller during aluminum foil high-power corona treatment can be improved, the aluminum foil can be better neutral during high-speed operation, the problems of deviation, temperature rise, scratching and the like in the aluminum foil corona treatment process are reduced, and the aluminum foil corona treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of corona rollers, in particular to a corona roller for an aluminum foil carbon coating unit. Background Art

[0002] Lithium-ion batteries are widely used in digital 3C, automotive power, energy storage and other fields due to their high energy density, long life and good safety. The positive electrode of lithium batteries is mainly composed of aluminum foil current collector, active material, conductive agent, adhesive, etc. Due to the smooth surface of aluminum foil obtained by rolling, the adhesion of positive electrode active material on aluminum foil is poor, and the interface resistance between active material and aluminum foil is large, which is not conducive to improving battery performance. The current mainstream technology in the market is to first coat a layer of conductive carbon layer on the surface of aluminum foil current collector, and then prepare the positive electrode active material layer on it. In the aluminum foil carbon coating technology, in order to ensure good wetting and spreading of the conductive carbon layer slurry on the aluminum foil surface and interfacial bonding when coating, the aluminum foil needs to be corona treated before coating, that is, using corona discharge to clean the residual grease on the aluminum foil surface and increase the surface tension (dyne value). The corona treatment of aluminum foil is to first pass the aluminum foil through the corona roller. The foil is transported forward as the corona roller rotates. The corona machine is energized synchronously and the aluminum foil surface is corona treated by ceramic tube discharge.

[0003] At present, most of the corona rollers of film coating equipment are coated with rubber (such as polysiloxane, silicone, etc.). Although the insulation is good, long-term corona discharge will cause damage to the structure of high molecular organic matter. In addition, the hardness of the rubber layer is low and it is not resistant to friction and wear caused by burrs on the edge of the aluminum foil.

[0004] Chinese patent publication number CN116254498A discloses a method for preparing a ceramic corona roller coating. While the coating has high insulation properties, the mass loss of the coating during corrosion is reduced, and the coating has good thermal conductivity and maintains the density of the surface layer of the ceramic corona roller substrate, it does not include a corona roller structural design.

[0005] Chinese patent publication number CN1157426A discloses a carbon fiber corona roller for lithium battery aluminum foil. The patent describes the use of carbon fiber and rubber coating, which may have good corona resistance and aging resistance, but is not resistant to friction with burrs on the edges of the aluminum foil, and the surface is easily scratched after long-term use.

[0006] However, at present, most manufacturers of carbon-coated aluminum foil corona machine equipment still use pure stainless steel rollers, which are not insulated and cannot achieve high-power corona discharge of aluminum foil. During high-power discharge, the roller conducts electricity and will damage other equipment accessories. In addition, when transmitting aluminum foil at high speed, the stainless steel material is soft and not wear-resistant, and the roughness decreases quickly, which can easily cause the tension to be unable to hold, and speed-up production will cause slippage and deviation. In addition, the edge of the aluminum foil rubs against the stainless steel surface for a long time, and tiny burrs and debris on the edge will continue to accumulate on the roller surface, resulting in annular linear nodules, which will cause scratches on the subsequent production of aluminum foil and other negative effects. In addition, the roller body of the current carbon-coated aluminum foil corona roller is basically a straight roller and the interior is a simple fully hollow water-cooled structure. It has shortcomings in the centering deviation of the aluminum foil during high-power corona discharge and high-speed operation, and the roller body and aluminum foil cooling after corona. Utility Model Content

[0007] The purpose of the utility model is to provide a corona roller for an aluminum foil carbon coating unit, so as to improve the surface wear resistance, burr resistance, insulation, and heat dissipation of the corona roller during high-power and high-speed corona treatment of aluminum foil, and to ensure better centering of the aluminum foil during high-speed operation, thereby reducing problems such as deviation, temperature rise, and scratches during the corona treatment of the aluminum foil, and improving the corona treatment effect of the aluminum foil.

[0008] To achieve the above objectives, the technical solution of the present utility model is as follows.

[0009] A corona roller for an aluminum foil carbon coating unit comprises a roller body, with a passive side flange and a driving side flange mounted on the left and right sides of the roller body, respectively. A passive shaft head is mounted on the outer surface of the passive side flange, a water hole is defined within the passive shaft head, and the water hole is connected to the interior of the roller body. A water inlet pipe is inserted into the water hole, with a gap between the outer surface of the water inlet pipe and the inner wall of the water hole. A water cooling mechanism is provided within the roller body. The roller body comprises a roller base, a transition layer, and a working layer. The transition layer is disposed on the outer surface of the roller base, and the working layer is disposed on the outer surface of the transition layer. The water cooling mechanism comprises a housing mounted within the roller body, with the ends of the housing connected to the passive side flange and the driving side flange, respectively. The housing has sealing flanges mounted within the housing near both ends, each having a center hole defined therein, and water inlet pipes are inserted into the interiors of the two center holes. A water return hole is defined on the outer surface of the housing between the left sealing flange and the passive side flange, and a water inlet hole is defined on the outer surface of the housing between the right sealing flange and the driving side flange.

[0010] It can be seen that by setting up the working layer, the surface hardness and wear resistance of the roller can be effectively improved, and the initial roughness of the roller surface can be kept slowly decreasing. In the process of long-term friction between the aluminum foil and the roller surface, surface wear is reduced, and the scratches and debris accumulation of the burrs on the edge of the aluminum foil on the roller surface are improved. In addition, the working layer can also provide an insulating and resisting effect during high-power corona discharge; and water enters from the water inlet pipe, enters between the outer surface of the shell and the inner wall of the roller through the water inlet hole, takes away the heat of the roller body, and then enters the water hole from the return hole, and is discharged from the gap between the water hole and the water inlet pipe, so that the water inlet and outlet paths are separated. Compared with the traditional integral hollow water-cooling structure, it can achieve high-speed circulation of cooling water, which has a better effect of taking away the heat transmitted to the roller body by high-power corona discharge.

[0011] Furthermore, the outer surface of the roller body is provided with centrally distributed slightly convex arcs, and the height difference between the highest point of the slightly convex arc in the middle of the roller body and the lowest points on both sides is 0.5-0.8mm.

[0012] Reasonable bulge setting can achieve a certain self-correction effect during the high-speed rotation of the aluminum foil corona transmission process, and does not affect the arc length distribution of high-power corona discharge.

[0013] Furthermore, a transmission shaft head is installed on the outer surface of the transmission side flange, and a keyway is provided on the transmission shaft head.

[0014] Through the setting of the transmission shaft head and keyway, it can be connected with an external coupling to provide power for the rotation of the roller.

[0015] Furthermore, both sides of the roller body and the outer surfaces of the passive side flange and the transmission side flange are provided with a rubber coating.

[0016] By setting up the rubber coating, the high-power corona discharge can be blocked from being transmitted to other equipment components to avoid damage.

[0017] Furthermore, the roller body, the water cooling mechanism and the water inlet pipe are all coaxially arranged.

[0018] The coaxial arrangement allows water to be evenly distributed between the water cooling mechanism and the roller body, evenly taking away heat.

[0019] Furthermore, the number of the water return holes and the water inlet holes is more than eight and they are distributed in a coaxial array.

[0020] More than eight water return holes and water inlet holes can ensure the fluidity of water, and the coaxial array distribution allows water to flow evenly between the water cooling mechanism and the roller body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0022] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present utility model.

[0023] Figure 3 It is a schematic diagram of the front and side cross-sectional structure of the water cooling mechanism in the utility model.

[0024] Figure 4 It is a structural schematic diagram of the roller body and the slightly convex arc in the utility model.

[0025] In the figure: 1. Roller body; 11. Roller body base; 12. Transition layer; 13. Working layer; 2. Passive side flange; 3. Transmission side flange; 4. Passive shaft head; 41. Water hole; 5. Transmission shaft head; 51. Keyway; 6. Water cooling mechanism; 61. Housing; 62. Return hole; 63. Water inlet hole; 64. Sealing flange; 65. Center hole; 7. Water inlet pipe; 8. Rubber coating. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings.

[0027] like Figure 1-4 As shown, a corona roller for an aluminum foil carbon coating unit includes a roller body 1. A passive side flange 2 and a driving side flange 3 are respectively mounted on the left and right sides of the roller body 1. A passive shaft head 4 is mounted on the outer surface of the passive side flange 2. A water hole 41 is formed inside the passive shaft head 4, and the water hole 41 is connected to the interior of the roller body 1. A water inlet pipe 7 is inserted into the water hole 41, and a gap is left between the outer surface of the water inlet pipe 7 and the inner wall of the water hole 41. A water cooling mechanism 6 is provided inside the roller body 1. The roller body 1 includes a roller body base 11, a transition layer 12, and a working layer 13. The transition layer 12 is disposed on the outer surface of the roller body base 11, and the working layer 13 is disposed on the outer surface of the transition layer 12. The water cooling mechanism 6 includes an outer shell 61 installed inside the roller body 1, and the two ends of the outer shell 61 are respectively connected to the passive side flange 2 and the transmission side flange 3. The inner part of the outer shell 61 is provided with a sealing flange 64 near its two ends. A center hole 65 is provided inside the sealing flange 64, and the water inlet pipe 7 is respectively inserted into the two center holes 65. A return hole 62 is provided on the outer surface of the outer shell 61 between the left sealing flange 64 and the passive side flange 2, and a water inlet hole 63 is provided on the outer surface of the outer shell 61 between the right sealing flange 64 and the transmission side flange 3.

[0028] The roller base 11 is made of stainless steel. The outer surface of the roller base 11 is covered with a NiAl / NiCr transition layer 12 prepared by thermal spraying technology with a thickness of 20 to 40 μm and an alumina ceramic working layer 13 with a thickness of 100 to 130 μm. The transition layer 12 can ensure that the working layer 13 is well bonded to the roller base 11. After the coating is prepared, the surface is ground to the roughness Ra0.3 to 0.5 μm designed for the corona roller. The working layer 13 has high electrical insulation and thermal conductivity, and can play an insulating barrier role and conduction heat dissipation role during the corona discharge treatment of the aluminum foil. The working layer 13 has high hardness and good wear resistance, and can effectively resist the edge roughness of the aluminum foil. The water inlet pipe 7 is connected to the external water supply system, and the cooling water enters through the water inlet pipe 7, enters between the outer surface of the shell 61 and the inner wall of the roller body 1 through the water inlet hole 63, takes away the heat of the roller body 1, and then enters the water hole 41 through the return hole 62, and is discharged from the gap between the water hole 41 and the water inlet pipe 7 to flow into the external return water system, so that the water inlet and outlet paths are separated. Compared with the traditional integral hollow water-cooling structure, it can realize high-speed circulation of cooling water, and play a better role in taking away the heat transmitted to the roller body 1 by high-power corona discharge; and the inner diameter of the water hole 41 is 1.5 times the outer diameter of the water inlet pipe 7, which can ensure the normal circulation of cooling water.

[0029] Specifically, the outer surface of the roller body 1 is provided with a centrally distributed slightly convex arc. The height difference between the highest point in the middle of the roller body 1 and the lowest point on both sides is 0.5-0.8mm. The reasonable convex setting can not only achieve a certain self-correcting effect during the high-speed rotation during the aluminum foil corona transmission process, but also does not affect the arc length distribution of high-power corona discharge.

[0030] Specifically, a transmission shaft head 5 is installed on the outer surface of the transmission side flange 3. A key slot 51 is provided on the transmission shaft head 5. Through the arrangement of the transmission shaft head 5 and the key slot 51, it can be connected to an external coupling to provide power for the rotation of the roller body 1.

[0031] Specifically, both sides of the roller body 1 and the outer surfaces of the passive side flange 2 and the transmission side flange 3 are provided with a rubber layer 8. The setting of the rubber layer 8 can prevent the discharge of high-power corona from being transmitted to other equipment components to avoid damage; the thickness of the rubber layer 8 is 8-12mm, and the material is EPDM.

[0032] Specifically, the roller body 1, the water cooling mechanism 6 and the water inlet pipe 7 are all coaxially arranged. The coaxial arrangement allows water to be evenly distributed between the water cooling mechanism 6 and the roller body 1, and evenly removes heat.

[0033] Specifically, the number of return water holes 62 and water inlet holes 63 is more than eight and they are distributed in a coaxial array. The more than eight return water holes 62 and water inlet holes 63 can ensure the fluidity of water, and the coaxial array distribution allows water to flow evenly between the water cooling mechanism 6 and the roller body 1.

[0034] The above is a detailed description of the present invention in conjunction with specific embodiments, and the specific implementation methods of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, if a number of equivalent substitutions or obvious modifications are made without departing from the concept of the present invention and the performance or use are the same, they should be considered to fall within the scope of patent protection of the present invention as determined by the submitted claims.

Claims

1. A corona roller for an aluminum foil carbon coating unit, comprising a roller body (1), characterized in that: A passive side flange (2) and a driving side flange (3) are respectively installed on the left and right sides of the roller body (1); a passive shaft head (4) is installed on the outer surface of the passive side flange (2); a water hole (41) is provided inside the passive shaft head (4), and the water hole (41) is communicated with the interior of the roller body (1); a water inlet pipe (7) is inserted into the water hole (41), and a gap is left between the outer surface of the water inlet pipe (7) and the inner wall of the water hole (41); a water cooling mechanism (6) is provided inside the roller body (1); The roller body (1) comprises a roller body base (11), a transition layer (12) and a working layer (13), wherein the transition layer (12) is arranged on the outer surface of the roller body base (11), and the working layer (13) is arranged on the outer surface of the transition layer (12); The water cooling mechanism (6) includes a shell (61) installed inside the roller body (1), and the two ends of the shell (61) are respectively connected to the passive side flange (2) and the driving side flange (3), and the inside of the shell (61) is provided with a blocking flange (64) near its two ends. The blocking flange (64) is provided with a center hole (65), and the water inlet pipe (7) is respectively inserted into the inside of the two center holes (65). The outer surface of the shell (61) is provided with a return water hole (62) between the blocking flange (64) and the passive side flange (2) on the left side, and the outer surface of the shell (61) is provided with a water inlet hole (63) between the blocking flange (64) and the driving side flange (3) on the right side.

2. The corona roller for an aluminum foil carbon coating unit according to claim 1, characterized in that: The outer surface of the roller body (1) is provided with centrally distributed slightly convex arcs, and the height difference between the highest point in the middle of the roller body (1) and the lowest points on both sides of the slightly convex arc is 0.5-0.8 mm.

3. The corona roller for an aluminum foil carbon coating unit according to claim 2, characterized in that: A transmission shaft head (5) is mounted on the outer surface of the transmission side flange (3), and a keyway (51) is provided on the transmission shaft head (5).

4. The corona roller for an aluminum foil carbon coating unit according to claim 3, characterized in that: Both sides of the roller body (1) and the outer surfaces of the passive side flange (2) and the driving side flange (3) are provided with a rubber coating layer (8).

5. The corona roller for an aluminum foil carbon coating unit according to claim 4, characterized in that: The roller body (1), the water cooling mechanism (6) and the water inlet pipe (7) are all coaxially arranged.

6. The corona roller for an aluminum foil carbon coating unit according to claim 1, characterized in that: The number of the water return holes (62) and the water inlet holes (63) is more than eight and they are distributed in a coaxial array.

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