Double-sided coating machine

Abstract

The utility model belongs to the technical field of battery production, and discloses a double-sided coating machine. The double-side coating machine comprises a front side coating mechanism, a back side coating mechanism and a visual sensor, wherein the front side coating mechanism is used for coating a first side of a moving material belt; the reverse side coating mechanism is used for coating the second side of the material belt; the visual sensor is arranged between the front surface coating mechanism and the back surface coating mechanism, and the distance between the projection of the visual sensor on the material belt and the projection of the back surface coating mechanism on the material belt is a first preset value; the visual sensor is arranged over against the first surface and can identify a coating starting point of the first surface; and the visual sensor is in communication connection with the back coating mechanism. The double-side coating machine can coat the front side and the back side of the material belt, and can accurately align the coating starting point of the second side to the coating starting point of the first side, so that the double-side coating quality is improved, and the waste of material coils is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a double-sided coating machine. Background Art

[0002] Lithium-ion battery electrode coating is a core step in the pre-production process. It generally involves evenly coating a well-stirred slurry on both sides of the current collector foil and drying the organic solvent in the slurry. Traditional coating machines typically coat one side, performing two operations per roll of electrode, in a fold-back process. The front and back coating dies are located on either side of the oven. The front side is first coated on one side, then dried in the oven. The back side is then coated on the other side. The film then enters a second drying oven to complete the double-sided coating process before being rewound.

[0003] During the production process, the operators of the front and back coating dies are separated by a considerable distance at either end of the drying oven. After coating is completed on the front side, the front coating point will pass through the drying oven to the back coating point. At this point, the operator of the back die must observe the location of the front coating point and quickly click a button to activate the back die to begin coating. During this process, the back die must maintain the same coating point as the front die. Otherwise, the single-sided coating will be scrapped. Single-sided coating also affects the efficiency of the subsequent roller press, hindering continuous operation of the equipment.

[0004] However, the operation method that relies on people to observe the starting point of coating on the front side and drive the coating on the back side may cause two situations: ① The back side enters the die head too early: the operator on the back side cannot enter the die head in time. If the die head is entered in advance, the coating film on the front side has not arrived, and there is a risk of wrinkling / breaking of the electrode, and at the same time, causing a single-sided phenomenon on the back side; ② The back side enters the die head too late, and a single-sided phenomenon on the front side will also occur, resulting in too many scrapped electrodes.

[0005] Therefore, it is urgent to provide a new double-sided coating machine to solve the above technical problems in the prior art. Utility Model Content

[0006] The purpose of the utility model is to provide a double-sided coating machine, which can coat both the front and back sides of the material strip and can accurately align the coating starting point of the back side with the coating starting point of the front side, thereby improving the quality of double-sided coating and reducing the waste of material rolls.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] The double-sided coating machine includes a front coating mechanism, a back coating mechanism and a visual sensor, the front coating mechanism is used to coat the first side of the moving material strip; the back coating mechanism is used to coat the second side of the material strip; the visual sensor is arranged between the front coating mechanism and the back coating mechanism, the distance between the projection of the visual sensor on the material strip and the projection of the back coating mechanism on the material strip is a first preset value, the visual sensor is arranged facing the first side and can identify the coating starting point of the first side; the visual sensor is communicatively connected to the back coating mechanism.

[0009] Optionally, the reverse coating mechanism includes a reverse coating die and a driving mechanism, the output end of the driving mechanism is connected to the reverse coating die and can drive the reverse coating die close to the second surface; the driving mechanism is communicatively connected to the visual sensor.

[0010] Optionally, the reverse coating mechanism further includes a controller, and the controller is communicatively connected to the visual sensor and the driving mechanism respectively.

[0011] Optionally, the driving mechanism includes an electric screw.

[0012] Optionally, the double-sided coating machine further includes a winding shaft, which is used for winding the material strip; the winding shaft and the front coating mechanism are located on the same side, and the visual sensor and the back coating mechanism are located on the other side, so that the direction of movement of the material strip between the front coating mechanism and the back coating mechanism is opposite to the direction of movement of the material strip between the back coating mechanism and the winding shaft.

[0013] Optionally, the double-sided coating machine further comprises a baking oven, the material strip between the front coating mechanism and the back coating mechanism is located on the first layer of the baking oven, and the material strip between the back coating mechanism and the winding shaft is located on the second layer of the baking oven.

[0014] Optionally, a plurality of rollers are provided between the baking oven and the reverse coating mechanism, and the rollers stretch the material strip to form a raised portion, and the visual sensor is located in the raised portion.

[0015] Optionally, the visual sensor includes a color mark sensor, and the color mark sensor can distinguish the color of the first surface before coating and the color of the first surface after coating.

[0016] Optionally, a straight-line distance between the color mark sensor and the first surface is 60 mm to 120 mm.

[0017] Optionally, the first preset value is 1m to 2m.

[0018] Beneficial effects:

[0019] In the double-sided coater of the present utility model, the front coating mechanism is first used to coat the first side of the tape, and then the reverse coating mechanism is used to coat the second side of the tape. A vision sensor is arranged between the front coating mechanism and the reverse coating mechanism. The vision sensor can identify the coating starting point on the first side, and the distance between the projection of the vision sensor on the tape and the projection of the reverse coating mechanism on the tape is a first preset value. When the vision sensor identifies the coating starting point of the first side, it transmits a signal to the reverse coating mechanism through communication. By combining the transmission speed of the tape and the magnitude of the first preset value, the time to start the reverse coating mechanism is calculated, so as to start coating the second side, ensuring that the coating starting point of the first side is aligned with the coating starting point of the second side, and avoiding waste of the tape caused by misalignment of the coating starting points of the first side and the second side. This double-sided coater can coat both the front and back sides of the tape, and can accurately align the coating starting point of the second side with that of the first side, improving the quality of double-sided coating and reducing waste of the tape. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the double-sided coater provided by the specific embodiment of the present utility model.

[0021] In the figure:

[0022] 10. Tape; 11. First side; 12. Second side; 21. Pay-off reel;

[0023] 110. Front coating die head; 120. Front coating transmission shaft; 210. Reverse coating die head; 220. Reverse coating transmission shaft; 300. Vision sensor; 301. Deflection roller; 410. Upper take-up reel; 420. Lower take-up reel; 500. Oven. Specific Embodiments

[0024] The following further describes the present utility model in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0025] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0028] like Figure 1 As shown, in this embodiment, the double-sided coating machine includes a front coating mechanism, a back coating mechanism and a visual sensor 300, the front coating mechanism is used to coat the first side 11 of the moving material strip 10; the back coating mechanism is used to coat the second side 12 of the material strip 10; the visual sensor 300 is arranged between the front coating mechanism and the back coating mechanism, and the distance between the projection of the visual sensor 300 on the material strip 10 and the projection of the back coating mechanism on the material strip 10 is a first preset value, the visual sensor 300 is arranged opposite to the first side 11 and can identify the coating starting point of the first side 11; the visual sensor 300 is communicatively connected with the back coating mechanism.

[0029] The double-sided coating machine first uses the front coating mechanism to coat the first side 11 of the material strip 10, and then uses the back coating mechanism to coat the second side 12 of the material strip 10. A visual sensor 300 is arranged between the front coating mechanism and the back coating mechanism. The visual sensor 300 can identify the coating starting point on the first side 11, and the distance between the projection of the visual sensor 300 on the material strip 10 and the projection of the back coating mechanism on the material strip 10 is a first preset value. When the visual sensor 300 identifies the coating starting point of the first side 11, it transmits the signal communication to the back coating mechanism, and calculates the time to start the back coating mechanism based on the transmission speed of the material strip 10 and the size of the first preset value, so as to start coating the second side 12, thereby ensuring that the coating starting point of the first side 11 is aligned with the coating starting point of the second side 12, avoiding waste of material rolls caused by the misalignment of the coating starting points of the first side 11 and the second side 12. The double-sided coating machine can coat both sides of the material strip 10 and can accurately align the coating starting point of the second side 12 with the coating starting point of the first side 11, thereby improving the quality of double-sided coating and reducing waste of material rolls.

[0030] The first side 11 described in this embodiment is the front side of the material strip 10 , and the second side 12 is the back side of the material strip 10 . The double-sided coating machine first coats the front side of the material strip 10 and then coats the back side of the material strip 10 .

[0031] Furthermore, the reverse coating mechanism includes a reverse coating die 210 and a drive mechanism (not shown in the figure). The output end of the drive mechanism is connected to the reverse coating die 210 and is capable of driving the reverse coating die 210 to approach the second surface 12. The drive mechanism is in communication with the visual sensor 300. The reverse coating die 210 is arranged relative to the reverse coating drive shaft 220. When the drive mechanism drives the reverse coating die 210 to move, the material roll can be clamped between the reverse coating die 210 and the reverse coating drive shaft 220, thereby coating the second surface 12. The setting of the drive mechanism can realize the automatic opening and operation of the reverse coating mechanism, improve the accuracy of the alignment of the coating starting point of the first surface 11 and the coating starting point of the second surface 12, and realize full automation of the operation, thereby improving the coating efficiency.

[0032] Specifically in the present embodiment, the above-mentioned reverse coating mechanism further includes a controller (not shown in the figure), and the above-mentioned controller is respectively communicated with the above-mentioned visual sensor 300 and the above-mentioned driving mechanism. The controller can be a PLC or a computer, as long as it has the ability to store and run the algorithm. The controller is used to communicate with the visual sensor 300 and the driving mechanism to realize the automatic opening or operation of the reverse coating mechanism, automatic and accurate recognition and execution, and alignment of the coating starting points of the first side 11 and the second side 12, thereby improving the degree of equipment automation and reducing the workload of the staff.

[0033] Optionally, the above driving mechanism includes an electric lead screw. Of course, the driving mechanism can also be a driving cylinder or a linear reciprocating motor, as long as it can realize the movement of the reverse coating die head 210 close to or away from the strip 10.

[0034] Please continue to refer to Figure 1 In this embodiment, the double-sided coater further includes a take-up reel for taking up the strip 10; the take-up reel and the front coating mechanism are on the same side, and the vision sensor 300 and the reverse coating mechanism are on the other side, so that the moving direction of the strip 10 between the front coating mechanism and the reverse coating mechanism is opposite to the moving direction of the strip 10 between the reverse coating mechanism and the take-up reel. It should be noted that the take-up reel includes an upper take-up reel 410 and a lower take-up reel 420, so as to realize the double-layer take-up of the strip 10, and the take-up efficiency is higher. And the take-up reel and the front coating mechanism are on the same side, and the vision sensor 300 and the reverse coating mechanism are on the other side, so that the moving direction of the strip 10 between the front coating mechanism and the reverse coating mechanism is opposite to the moving direction of the strip 10 between the reverse coating mechanism and the take-up reel, which can reduce the space occupied by the double-sided coater, thereby reducing the factory building cost.

[0035] Optionally, the double-sided coater further includes an oven 500. The strip 10 between the front coating mechanism and the reverse coating mechanism is located on the first layer of the oven 500, and the strip 10 between the reverse coating mechanism and the take-up reel is located on the second layer of the oven 500. The oven 500 is used to bake the coating layers on the first side 11 and the second side 12 of the strip, so as to ensure that the coating layers are firmly adhered to the strip 10; and using one oven 500 to realize the simultaneous baking of the first and second sides 12 can reduce the number of ovens 500 and lower the equipment cost.

[0036] Furthermore, a plurality of guide rollers 301 are provided between the oven 500 and the reverse coating mechanism. The guide rollers 301 support the strip 10 to form a convex portion, and the vision sensor 300 is located inside the convex portion. In this embodiment, 3 guide rollers 301 are provided. In cooperation with the reverse coating transmission shaft 220, the strip 10 can be supported to form a U-shaped convex portion. The vision sensor 300 is arranged at the opening of the U-shaped convex portion and is directly opposite to the strip 10 close to the reverse coating transmission shaft 220; the setting of the convex portion can accommodate the vision sensor 300, provide an installation space for the vision sensor 300, and facilitate the assembly of the double-sided coater.

[0037] In this embodiment, the visual sensor 300 includes a color mark sensor, and the color mark sensor can distinguish the color of the first surface 11 before coating from the color of the first surface 11 after coating. It should be noted that the double-sided coater in this embodiment is used for coating the electrode sheet. For example, if the strip 10 is a copper foil strip, its surface is copper-colored before coating and black after coating with the slurry; when the strip 10 is an aluminum foil strip, its surface is silver before coating and black after coating with the slurry. That is, the color mark sensor can distinguish copper color, silver color and black color, and the starting point of the black color is the coating starting point of the coating.

[0038] Furthermore, the linear distance between the color mark sensor and the first surface 11 is 60 mm to 120 mm. In this embodiment, the first preset value is 1 m to 2 m. The specific values of the linear distance between the color mark sensor and the first surface 11 and the first preset value are determined by those skilled in the art according to the length, width, transmission speed of the strip 10 and the recognition accuracy of the color mark sensor, and no specific limitation is made here.

[0039] In this embodiment, a pay-off reel 21 is provided at the starting point in the transmission direction of the strip 10, and the pay-off reel 21 is used for unwinding the strip 10; the front coating mechanism includes a front coating die head 110 and a front coating transmission shaft 120. The front coating die head 110 faces the front coating transmission shaft 120 and is used for coating the first surface 11 of the strip, and the front coating transmission shaft 120 is used for transmitting the strip and providing support for the strip to improve the coating quality of the first surface 11.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Double-sided coater, characterized in that, Including: A front coating mechanism for coating the first side (11) of a moving strip (10); A back coating mechanism for coating the second side (12) of the strip (10); A vision sensor (300) disposed between the front coating mechanism and the back coating mechanism. The distance between the projection of the vision sensor (300) on the strip (10) and the projection of the back coating mechanism on the strip (10) is a first preset value. The vision sensor (300) is disposed facing the first side (11) and can identify the coating starting point of the first side (11). The vision sensor (300) is communicatively connected to the back coating mechanism.

2. The double-sided coater according to claim 1, wherein The back coating mechanism includes a back coating die head (210) and a driving mechanism. The output end of the driving mechanism is connected to the back coating die head (210) and can drive the back coating die head (210) to approach the second side (12). The driving mechanism is communicatively connected to the vision sensor (300).

3. The double-sided coater according to claim 2, wherein The back coating mechanism further includes a controller, and the controller is communicatively connected to the vision sensor (300) and the driving mechanism respectively.

4. The double-sided coater according to claim 2, wherein, The driving mechanism includes an electric lead screw.

5. The double-sided coater according to claim 1, wherein, The double-sided coater further includes a take-up reel for taking up the strip (10). The take-up reel and the front coating mechanism are on the same side, and the vision sensor (300) and the back coating mechanism are on the other side, so that the moving direction of the strip (10) between the front coating mechanism and the back coating mechanism is opposite to the moving direction of the strip (10) between the back coating mechanism and the take-up reel.

6. The double-sided coater according to claim 5, characterized in that, The double-sided coater further includes an oven (500). The strip (10) between the front coating mechanism and the back coating mechanism is located on the first layer of the oven (500), and the strip (10) between the back coating mechanism and the take-up reel is located on the second layer of the oven (500).

7. The double-sided coater according to claim 6, characterized in that, A plurality of guide rollers (301) are further disposed between the oven (500) and the back coating mechanism. The guide rollers (301) stretch out the strip (10) to form a raised portion, and the vision sensor (300) is located within the raised portion.

8. The double-sided coater according to claim 1, characterized in that, The vision sensor (300) includes a color mark sensor, and the color mark sensor can distinguish the color of the first side (11) before coating from the color of the first side (11) after coating.

9. The double-sided coater according to claim 8, wherein, The linear distance between the color mark sensor and the first side (11) is 60 mm to 120 mm.

10. The double-sided coater according to claim 8, characterized in that, The first preset value is 1 m to 2 m.

Images