Coating mechanism compatible with gravure forward coating and micro gravure reverse coating

Abstract

The invention discloses a coating mechanism compatible with gravure smooth coating and micro gravure reverse coating. The coating mechanism comprises a rack, a downward pressing unit arranged on the rack, a switching unit arranged on the downward pressing unit, a plate roller unit arranged below the switching unit and a closed material box arranged below the plate roller unit. The pressing unit is used for driving the switching unit to move towards or away from the plate roller unit; the switching unit comprises a rotating seat, a coating rubber roller for gravure coating, an approaching roller for micro gravure coating and a rotating motor; the two rotating seats are rotatably and oppositely mounted on the pressing unit; the coating rubber roller and the approaching roller are mounted between the two rotating seats in a rotatable manner; the rotating motor is used for driving the rotating seat to rotate so as to switch one of the coating rubber roller and the approaching roller to reach a coating processing position; the closed material box is used for moving towards or away from the plate roller unit; therefore, after the scheme is adopted, the problem that low-cost quick conversion between gravure smooth coating and micro gravure reverse coating cannot be realized in the prior art can be practically solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gravure forward coating and microgravure reverse coating, and particularly relates to a coating mechanism compatible with gravure forward coating and microgravure reverse coating. Background Art

[0002] The undercoating process for the positive or negative electrode of a lithium battery is divided into two types: gravure forward coating and microgravure reverse coating. The differences between the two processes are as follows:

[0003] 1. In gravure coating, the foil is pressed onto the surface of the gravure roll through a coating rubber roll, and the rotating directions of the coating rubber roll and the plate roll are the same as the running direction of the foil; while in microgravure coating, the foil is attached to the surface of the microgravure roll through two approaching rolls, and the rotating direction of the microgravure roll is opposite to the running direction of the foil.

[0004] 2. For the transfer of the gravure coating slurry, a downward pressure is applied through the rubber roll to transfer the slurry from the cells of the plate roll to the surface of the foil; while for the transfer of the microgravure coating slurry, the foil is gently attached to the microgravure roll by two approaching rolls with a certain spacing, so as to transfer the slurry to the surface of the foil in the future. There are significant differences in the forces applied to the foil by the two.

[0005] 3. The material box for gravure coating is usually of an open structure, and a doctor blade on the feeding side is used to scrape off the slurry on the surface of the plate roll; while the material box for microgravure coating is usually of a closed structure, and a double doctor blade structure is equipped on both sides of the material box to scrape off the slurry on the surface of the plate roll.

[0006] 4. The gravure roll for gravure coating is usually of a hollow structure, with a relatively large plate roll diameter (conventional diameter is 200 - 400 mm), and is clamped and positioned through the top cones on both sides; while the gravure roll for microgravure coating is usually of a structure with shaft heads, with a relatively small plate roll diameter (conventional diameter is 100 mm), and is connected and positioned through the shaft and the transmission component.

[0007] With the development of battery technology, the requirements for the foil used for the positive and negative electrodes tend to be thinner, and at the same time, composite foils have emerged. Conventional gravure coating mechanisms can only adapt to the coating of one type of foil. When different materials of foils need to be replaced, new workshops, supporting equipment, manpower, etc. need to be re-invested, resulting in high costs and large investments.

[0008] However, the existing gravure coating mechanism and microgravure coating mechanism are two completely different devices and processes. When both coating processes are required, corresponding gravure coating equipment and microgravure coating equipment must be supported, and there are also problems such as high investment.

[0009] Moreover, the hollow type plate cylinder structure and the conical surface fitting and positioning method of the existing gravure coating mechanism have large left-right concentricity deviation, long assembly dimension chain, and the left-right concentricity of the plate cylinders after assembly can only be guaranteed to be between 0.05 mm and 0.1 mm, which is lower than 0.02 - 0.03 mm after the assembly of the gravure plate cylinder, affecting the coating accuracy. Although the top cone type structure has protection measures to prevent falling in case of power failure or air supply interruption, in actual use, major safety accidents of plate cylinder falling may occur due to incorrect connection of the air circuit of the locking cylinder, manual transverse movement amplitude exceeding the top cone tightening range, and cylinder damage. For the open type material box structure for soaking the plate cylinder, since the slurry is exposed to the workshop environment for a long time, caking, precipitation and secondary pollution are likely to occur. The open type material box has a large size, and when the machine stops or the slurry is replaced, a large amount of slurry is wasted.

[0010] However, the plate cylinders of the existing gravure coating mechanism can only be compatible with relatively small diameters, and are usually integrated with a closed type material box. During coating, real-time detection and correction of the closed-loop overprint of the tab blanking area size are required. The conventional gravure plate cylinder structure has no transverse movement function, and manual measurement needs to be carried out close to the tab area of the foil in real time when the coating mechanism is working, with large detection deviation and potential safety hazards.

[0011] And the approaching rollers of the existing gravure coating mechanism are usually pushed forward by a two-stage cylinder, with the first stage being the preparatory position and the second stage being the coating position, and the coating position is positioned by left and right limit blocks. Due to the complex structure and narrow space layout, the positioning operation of the coating position is very inconvenient.

[0012] In summary, there are many technical drawbacks in the existing gravure forward coating and gravure reverse coating structures. Especially for how to achieve low-cost and rapid transformation between the two coating methods, it is an urgent technical problem to be solved. Summary of the Invention

[0013] The purpose of the present invention is to provide a coating mechanism compatible with gravure forward coating and gravure reverse coating, so as to solve the problem that the existing technology cannot achieve low-cost and rapid transformation between gravure forward coating and gravure reverse coating.

[0014] To solve the above technical problems, the present invention provides a coating mechanism compatible with gravure forward coating and reverse microgravure coating, comprising a frame, a pressing unit arranged on the frame, a switching unit arranged on the pressing unit, a plate roller unit arranged below the switching unit, and an enclosed material box arranged below the plate roller unit; the pressing unit is used to drive the switching unit to move towards or away from the plate roller unit; the switching unit includes a rotating seat, a coating rubber roller for gravure coating, an approaching roller for reverse microgravure coating, and a rotating motor; the two rotating seats are installed on the pressing unit in a rotatable and opposite manner; the coating rubber roller and the approaching roller are installed between the two rotating seats in a rotatable manner; the rotating motor is used to drive the rotating seat to rotate so as to switch one of the coating rubber roller and the approaching roller to the coating processing position; the enclosed material box is used to move towards or away from the plate roller unit.

[0015] In one embodiment, the two pressing units are arranged oppositely on both sides of the frame, and the rotating seats are respectively arranged on the two pressing units.

[0016] In one embodiment, the pressing unit includes a pressing motor, a pressing lead screw, a lifting seat, and a linear guide rail; the two pressing motors are respectively arranged on opposite sides of the frame, the output shafts of the two pressing motors are respectively in transmission connection with the two pressing lead screws, and the two pressing motors are respectively used to drive the two pressing lead screws to rotate; the two lifting seats are respectively in threaded transmission connection with the two pressing lead screws, the two lifting seats are respectively slidably installed on the two linear guide rails, the rotating seats are respectively installed on the two lifting seats, and the rotating motor is arranged on one of the lifting seats; the two linear guide rails are vertically arranged on opposite sides of the frame.

[0017] In one embodiment, the lifting seat includes a first lifting slider, a second lifting slider, and a pressing air cylinder; the first lifting slider is arranged above the second lifting slider, the first lifting slider is slidably installed on the linear guide rail, and the first lifting slider is connected to the pressing lead screw; the pressing air cylinder is arranged on the first lifting slider, the telescopic end of the pressing air cylinder is arranged downward, and the telescopic end of the pressing air cylinder is connected to the second lifting slider; the second lifting slider is slidably installed on the linear guide rail, and the rotating seat is arranged on the second lifting slider.

[0018] In one embodiment, the plate cylinder unit includes a transverse movement motor, a speed reducer, a transverse movement lead screw, a gravure cylinder, and a rotation motor; the output shaft of the transverse movement motor is connected to the power input end of the speed reducer; the power output end of the speed reducer is in transmission connection with the transverse movement lead screw; the transverse movement lead screw is in transmission connection with one end of the gravure cylinder, and the rotation of the transverse movement lead screw is used to drive the gravure cylinder to move horizontally; the other end of the gravure cylinder is in transmission connection with the rotation motor; the rotation motor is used to drive the gravure cylinder to rotate.

[0019] In one embodiment, the plate cylinder unit further includes a first mounting seat, a second mounting seat, a first connecting member, and a second connecting member; the first mounting seat and the second mounting seat are respectively arranged on opposite sides of the frame, and the transverse movement lead screw is arranged inside the first mounting seat; one end of the first connecting member is inserted into the inside of the first mounting seat so that the first connecting member has two use states of moving into and out of the inside of the first mounting seat, and this end of the first connecting member is in threaded transmission connection with the transverse movement lead screw, and the other end of the first connecting member is connected to one end of the gravure cylinder; one end of the second connecting member is connected to the other end of the gravure cylinder, and the other end of the second connecting member is inserted into the second mounting seat and is connected to the telescopic output shaft of the rotation motor so that the horizontal movement of the second connecting member can be used to change the telescopic state of the output shaft of the rotation motor.

[0020] In one embodiment, a limiting through groove is provided on the side wall of the first mounting seat, and a limiting pin is provided on the side wall of the first connecting member, and the limiting pin is slidably mounted in the limiting through groove.

[0021] In one embodiment, the enclosed material box is provided with a moving motor, and the moving motor is used to drive the enclosed material box to move towards or away from the plate cylinder unit.

[0022] The beneficial effects of the present invention are as follows:

[0023] Since the rotation motor is used to drive the rotation seat to rotate so as to switch one of the coating rubber roller and the approaching roller to the coating processing position, according to different application scenarios, by switching the positions of the coating rubber roller and the approaching roller, the rapid switching between the gravure forward coating process and the micro gravure reverse coating process can be realized, thereby effectively solving the problem that the prior art cannot realize the low-cost and rapid transformation between the gravure forward coating and the micro gravure reverse coating. Description of the Drawings

[0024] To more clearly illustrate the technical solution of the present invention, the accompanying drawings required for the implementation will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is the structural schematic diagram provided by the embodiment of the present invention;

[0026] Figure 2 is Figure 1 the structural schematic diagram of the pressing unit and the switching unit of;

[0027] Figure 3 is Figure 1 the structural schematic diagram of the plate roller unit of;

[0028] Figure 4 is Figure 1 the structural schematic diagram of the first application state of;

[0029] Figure 5 is Figure 1 the structural schematic diagram of the second application state of.

[0030] The reference numerals are as follows:

[0031] 10, frame;

[0032] 20, pressing unit; 21, pressing motor; 22, pressing lead screw; 23, lifting seat; 231, first lifting slider; 232, second lifting slider; 233, pressing cylinder; 24, linear guide rail;

[0033] 30, switching unit; 31, rotating seat; 32, coating rubber roller; 33, approaching roller; 34, rotating motor;

[0034] 40, plate roller unit; 41, transverse movement motor; 42, reducer; 43, transverse movement lead screw; 44, gravure roller; 45, self-rotation motor; 461, first mounting seat; 462, second mounting seat; 471, first connecting piece; 472, second connecting piece; 48, limiting through groove; 49, limiting pin;

[0035] 50, enclosed material box; 51, moving motor. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] The present invention provides a coating mechanism compatible with gravure forward coating and microgravure reverse coating, and its embodiments are as Figures 1 to 5As shown in the figure, it includes a frame 10, a pressing unit 20 provided on the frame 10, a switching unit 30 provided on the pressing unit 20, a plate roller unit 40 provided below the switching unit 30, and a closed material box 50 provided below the plate roller unit 40; the pressing unit 20 is used to drive the switching unit 30 to move towards or away from the plate roller unit 40; the switching unit 30 includes a rotating seat 31, a coating rubber roller 32 for gravure coating, a proximity roller 33 for micro gravure coating, and a rotating motor 34; the two rotating seats 31 are installed on the pressing unit 20 in a rotatable and opposite manner; the coating rubber roller 32 and the proximity roller 33 are installed between the two rotating seats 31 in a rotatable manner; the rotating motor 34 is used to drive the rotating seat 31 to rotate so as to switch one of the coating rubber roller 32 and the proximity roller 33 to reach the coating processing position; the closed material box 50 is used to move towards or away from the plate roller unit 40.

[0038] As Figure 1 , Figure 2 and Figure 4 shown in the figure, if gravure forward coating is required, the switching unit 30 can be used to control the rotation of the rotating seat 31 so that the coating rubber roller 32 is placed below the proximity roller 33, and then the pressing unit 20 is used to move the coating rubber roller 32 towards the plate roller unit 40 and move the closed material box 50 towards the plate roller unit 40 to convey the coating material.

[0039] And as Figure 1 , Figure 2 and Figure 5 shown in the figure, if gravure forward coating is required, the switching unit 30 can be used to control the rotation of the rotating seat 31 so that the proximity roller 33 is placed below the coating rubber roller 32, and then the pressing unit 20 is used to move the proximity roller 33 towards the plate roller unit 40 and move the closed material box 50 towards the plate roller unit 40 to convey the coating material.

[0040] As Figure 1 and Figure 2 shown in the figure, in this embodiment, two pressing units 20 are arranged oppositely on both sides of the frame 10, and rotating seats 31 are respectively provided on the two pressing units 20.

[0041] After adopting this setting method, the two pressing units 20 can simultaneously provide a downward pressing driving force for the switching unit 30, so that the downward movement process of the switching unit 30 becomes more stable.

[0042] As Figure 1 and Figure 2As shown in the figure, in this embodiment, the pressing-down unit 20 is provided with a pressing-down motor 21, a pressing-down lead screw 22, a lifting seat 23 and a linear guide rail 24; the two pressing-down motors 21 are respectively arranged on the opposite sides of the frame 10, the output shafts of the two pressing-down motors 21 are respectively connected to the two pressing-down lead screws 22 in a transmission manner, and the two pressing-down motors 21 are respectively used to drive the two pressing-down lead screws 22 to rotate self; the two lifting seats 23 are respectively in threaded transmission connection with the two pressing-down lead screws 22, the two lifting seats 23 are respectively slidably mounted on the two linear guide rails 24, and rotating seats 31 are respectively mounted on the two lifting seats 23, and a rotating motor 34 is provided on one of the lifting seats 23; the two linear guide rails 24 are vertically arranged on the opposite sides of the frame 10.

[0043] After adopting this setting method, once the pressing-down motor 21 is started, the pressing-down motor 21 will drive the pressing-down lead screw 22 to rotate self, and the rotation of the pressing-down lead screw 22 will drive the lifting seat 23 to move back and forth on the linear guide rail 24, thereby realizing the lifting movement control of the switching unit 30.

[0044] As Figure 2 shown in the figure, in this embodiment, the lifting seat 23 is provided with a first lifting slider 231, a second lifting slider 232 and a pressing-down air cylinder 233; the first lifting slider 231 is arranged above the second lifting slider 232, the first lifting slider 231 is slidably mounted on the linear guide rail 24, and the first lifting slider 231 is connected to the pressing-down lead screw 22; the pressing-down air cylinder 233 is arranged on the first lifting slider 231, the telescopic end of the pressing-down air cylinder 233 is arranged downward, and the telescopic end of the pressing-down air cylinder 233 is connected to the second lifting slider 232; the second lifting slider 232 is slidably mounted on the linear guide rail 24, and a rotating seat 31 is provided on the second lifting slider 232.

[0045] After adopting this setting method, the pressing-down air cylinder 233 can be used to buffer the downward pressure of the coating rubber roller 32 to prevent the foil material from being wrinkled; and in microgravure coating, the pressing-down air cylinder 233 serves as the second stroke, and can realize the standby position of the approaching roller 33 before coating. During coating, the pressing-down air cylinder 233 can be extended to be close to the microgravure roller.

[0046] As Figure 1 and Figure 3 shown in the figure, in this embodiment, the plate roller unit 40 is provided with a transverse movement motor 41, a speed reducer 42, a transverse movement lead screw 43, an intaglio roller 44 and a self-rotation motor 45; the output shaft of the transverse movement motor 41 is connected to the power input end of the speed reducer 42; the power output end of the speed reducer 42 is connected to the transverse movement lead screw 43 in a transmission manner; the transverse movement lead screw 43 is connected to one end of the intaglio roller 44 in a transmission manner, and the self-rotation of the transverse movement lead screw 43 is used to drive the intaglio roller 44 to move horizontally; the other end of the intaglio roller 44 is connected to the self-rotation motor 45 in a transmission manner; the self-rotation motor 45 is used to drive the intaglio roller 44 to rotate self.

[0047] After adopting the above setting method, once the transverse movement motor 41 starts, the transverse movement motor 41 can output power to the speed reducer 42. The speed reducer 42 changes the high-speed rotation generated by the transverse movement motor 41 into low-speed rotation, thereby controlling the transverse lead screw 43 to rotate self-rotationally. The self-rotation of the transverse lead screw 43 will drive the gravure roller 44 to move horizontally left and right, thereby adjusting the position of the gravure roller 44.

[0048] It should be noted that when the foil material is running, it is easy to move horizontally left and right, resulting in the inability to overlap the coating area of the foil material with the engraved reticular area on the gravure roller 44 according to the process dimension requirements. Therefore, after controlling the horizontal movement of the gravure roller 44 by the above method, the coating area of the foil material can be better overlapped with the engraved reticular area on the gravure roller 44.

[0049] If it is necessary to control the self-rotation of the gravure roller 44, the self-rotation motor 45 can be started to provide the power for the self-rotation of the gravure roller 44 by using the self-rotation motor 45.

[0050] As Figure 1 and Figure 3 shown, in this embodiment, the plate roller unit 40 is further provided with a first mounting seat 461, a second mounting seat 462, a first connecting member 471 and a second connecting member 472; the first mounting seat 461 and the second mounting seat 462 are respectively arranged on opposite sides of the frame 10, and the transverse lead screw 43 is arranged inside the first mounting seat 461; one end of the first connecting member 471 is inserted into the inside of the first mounting seat 461, so that the first connecting member 471 has two use states of moving into and out of the inside of the first mounting seat 461. This end of the first connecting member 471 is in threaded transmission connection with the transverse lead screw 43, and the other end of the first connecting member 471 is connected to one end of the gravure roller 44; one end of the second connecting member 472 is connected to the other end of the gravure roller 44, and the other end of the second connecting member 472 is inserted into the second mounting seat 462 and is connected to the telescopic output shaft of the self-rotation motor 45, so that the horizontal movement of the second connecting member 472 can be used to change the telescopic state of the output shaft of the self-rotation motor 45.

[0051] After adopting the above setting method, once the transverse lead screw 43 obtains power and rotates self-rotationally, since the transverse lead screw 43 and the first connecting member 471 are in threaded rotational connection, the first connecting member 471 can thus move horizontally left and right, and drive the gravure roller 44 and the second connecting member 472 to move synchronously. Moreover, at this time, since the self-rotation motor 45 has a telescopic output shaft, it also provides a movable space for the movement of the above components.

[0052] As Figure 3 shown, in this embodiment, a limiting through groove 48 is provided on the side wall of the first mounting seat 461, and a limiting pin 49 is provided on the side wall of the first connecting member 471. The limiting pin 49 is slidably installed in the limiting through groove 48.

[0053] After adopting this setting method, since the limit pin 49 can only move linearly back and forth within the limit through groove 48, it is essentially equivalent to restricting the moving stroke of the first connecting member 471 and other related connecting components, thereby preventing phenomena such as parts coming out.

[0054] As Figure 1 , Figure 4 and Figure 5 shown, in this embodiment, the closed material box 50 is provided with a moving motor 51, and the moving motor 51 is used to drive the closed material box 50 to move towards or away from the plate roller unit 40.

[0055] Specifically, the above-mentioned moving motor 51 can be a cylinder, or a combination of a motor and a lead screw drive structure, as long as it can generate a pushing and pulling force in the linear direction to control the movement of the closed material box 50 towards and away from the plate roller unit 40.

[0056] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A coating mechanism compatible with gravure forward coating and reverse gravure coating, characterized in that it includes a frame, a downward pressing unit arranged on the frame, a switching unit arranged on the downward pressing unit, a plate roller unit arranged below the switching unit, and a closed material box arranged below the plate roller unit; The downward pressing unit is used to drive the switching unit to move towards or away from the plate roller unit; The switching unit includes a rotating seat, a coating rubber roller for gravure coating, an approaching roller for reverse gravure coating, and a rotating motor; the two rotating seats are installed on the downward pressing unit in a rotatable and opposite manner; the coating rubber roller and the approaching roller are installed between the two rotating seats in a rotatable manner; the rotating motor is used to drive the rotating seat to rotate so as to switch one of the coating rubber roller and the approaching roller to the coating processing position; The closed material box is used to move towards or away from the plate roller unit.

2. The coating mechanism according to claim 1, characterized in that the two downward pressing units are arranged relatively on both sides of the frame, and the rotating seats are respectively arranged on the two downward pressing units.

3. The coating mechanism according to claim 2, characterized in that the downward pressing unit includes a downward pressing motor, a downward pressing lead screw, a lifting seat, and a linear guide rail; the two downward pressing motors are respectively arranged on the opposite sides of the frame, the output shafts of the two downward pressing motors are respectively in transmission connection with the two downward pressing lead screws, and the two downward pressing motors are respectively used to drive the two downward pressing lead screws to rotate self; the two lifting seats are respectively in threaded transmission connection with the two downward pressing lead screws, the two lifting seats are respectively slidably installed on the two linear guide rails, the rotating seats are respectively installed on the two lifting seats, and the rotating motor is arranged on one of the lifting seats; the two linear guide rails are vertically arranged on the opposite sides of the frame.

4. The coating mechanism according to claim 3, characterized in that the lifting seat includes a first lifting slider, a second lifting slider, and a downward pressing air cylinder; the first lifting slider is arranged above the second lifting slider, the first lifting slider is slidably installed on the linear guide rail, and the first lifting slider is connected with the downward pressing lead screw; the downward pressing air cylinder is arranged on the first lifting slider, the telescopic end of the downward pressing air cylinder is arranged downward, and the telescopic end of the downward pressing air cylinder is connected with the second lifting slider; the second lifting slider is slidably installed on the linear guide rail, and the rotating seat is arranged on the second lifting slider.

5. The coating mechanism according to claim 1, characterized in that the plate roller unit includes a transverse movement motor, a reducer, a transverse movement lead screw, a gravure roller, and a self-rotation motor; the output shaft of the transverse movement motor is connected with the power input end of the reducer; the power output end of the reducer is in transmission connection with the transverse movement lead screw; the transverse movement lead screw is in transmission connection with one end of the gravure roller, and the self-rotation of the transverse movement lead screw is used to drive the gravure roller to move horizontally; the other end of the gravure roller is in transmission connection with the self-rotation motor; the self-rotation motor is used to drive the gravure roller to rotate self.

6. The coating mechanism according to claim 5, characterized in that The plate cylinder unit further includes a first mounting seat, a second mounting seat, a first connecting member, and a second connecting member; The first mounting seat and the second mounting seat are respectively arranged on opposite sides of the frame, and the transverse movement lead screw is arranged inside the first mounting seat; One end of the first connecting member is inserted into the inside of the first mounting seat, so that the first connecting member has two use states of moving into and out of the inside of the first mounting seat. This end of the first connecting member is in threaded transmission connection with the transverse movement lead screw, and the other end of the first connecting member is connected to one end of the gravure cylinder; One end of the second connecting member is connected to the other end of the gravure cylinder, and the other end of the second connecting member is inserted into the second mounting seat and connected to the telescopic output shaft of the rotation motor, so that the transverse movement of the second connecting member can be used to change the telescopic state of the output shaft of the rotation motor.

7. The coating mechanism according to claim 6, wherein A limiting through groove is provided on the side wall of the first mounting seat, and a limiting pin is provided on the side wall of the first connecting member. The limiting pin is slidably mounted in the limiting through groove.

8. The coating mechanism according to claim 1, wherein The enclosed material box is provided with a moving motor, and the moving motor is used to drive the enclosed material box to move towards or away from the plate cylinder unit.

Images