Coating device

Abstract

The utility model belongs to the technical field of coating machines, and discloses a coating device. The coating device comprises a coating die head, a slurry pipe, a coating valve and a return valve which are communicated in sequence, slurry can flow out of an outlet of the coating die head through the return valve, the coating valve, the slurry pipe and the coating die head in sequence, the return valve can enable part of the slurry to flow back to the return valve, and the coating device further comprises a back suction valve mechanism. The back-suction valve mechanism comprises a back-suction pipe and a back-suction valve assembly, the back-suction pipe is communicated with the slurry pipe, the back-suction valve assembly comprises a back-suction driving part and a sealing assembly, the back-suction pipe is filled with the sealing assembly in a sealed mode, and the back-suction driving part can drive the sealing assembly to reciprocate along the back-suction pipe. According to the coating device, the slurry absorption effect is obvious, and then the situation that slurry overflows from the coating die head during the coating interval is avoided.

Description

Technical Field

[0001] This utility model relates to the field of coating machine technology, and in particular to a coating device. Background Technology

[0002] Existing gap coating valves for lithium battery electrode coating generally include a reflux valve body and a coating valve body. The reflux valve body has a reflux chamber, and the coating valve body has a coating chamber. During the coating operation of the battery electrode, the slurry can enter the coating chamber and then flow out through the coating pipe of the coating valve body to coat the electrode. During the blanking operation of the battery electrode, the slurry can enter the reflux chamber and then flow out through the reflux pipe of the reflux valve body to realize the circulation of the slurry. Thus, the slurry can re-enter the coating chamber and flow out through the coating pipe again. In this structure, because the spaces of the reflux chamber and coating chamber are usually relatively small, during the coating operation, the coating chamber often experiences significant positive pressure fluctuations due to the increase in slurry volume, while the reflux chamber often experiences significant negative pressure fluctuations due to the decrease in slurry volume. This causes a sudden increase in pressure in the coating pipeline and a sudden decrease in pressure in the reflux pipeline, which can easily lead to excessive thickness at the head of the electrode coating, affecting the coating effect, reducing coating efficiency, and increasing coating costs. When the coating valve is closed, the electrode enters the blank gap area, at which point the slurry overflows and carries material along the edge, resulting in a wavy boundary, which seriously affects the quality of the coated product and fails to meet customer process requirements.

[0003] In the prior art, a back-suction structure is set between the coating valve and the coating die head to regulate the pressure inside the slurry pipe to solve the above problems. However, the existing solution has a gap between the actuator and the pipe wall, which can easily cause agitation of the slurry during movement. The effect on the pressure inside the pipe is not obvious, and slurry overflow will still occur.

[0004] Therefore, there is an urgent need to design a coating device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a coating device that can significantly improve the absorption capacity of slurry during the coating interval and prevent slurry overflow from the coating die during the coating interval.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Coating apparatus, comprising:

[0008] The coating die, slurry pipe, coating valve and return valve are connected in sequence. The coating valve is configured to allow the slurry to flow out from the outlet of the coating die after passing through the return valve, the coating valve, the slurry pipe and the coating die in sequence. The return valve allows a portion of the slurry to flow back to the return valve.

[0009] The back suction mechanism includes a back suction pipe and a back suction valve assembly. The back suction pipe is connected to the slurry pipe. The back suction valve assembly includes a back suction drive and a sealing assembly. The sealing assembly slides and seals against the inner wall of the back suction pipe. The back suction drive can drive the sealing assembly to reciprocate along the back suction pipe.

[0010] As an alternative, the aforementioned back-suction drive component is a cylinder.

[0011] As an optional solution, the coating apparatus further includes a limit adjustment component, which is installed inside the back suction pipe and located between the sealing component and the slurry pipe, and is configured to limit the sealing component.

[0012] As an alternative, at least part of the aforementioned limit adjustment component is adjustable in the axial direction of the aforementioned suction pipe, so that the stroke of the aforementioned sealing component is adjustable.

[0013] As an optional solution, the aforementioned limit adjustment component includes:

[0014] An installation plate is installed inside the aforementioned suction pipe and located between the aforementioned sealing assembly and the aforementioned slurry pipe; a through hole is provided on the aforementioned installation plate.

[0015] Adjusting bolts are threadedly connected to the aforementioned mounting plate.

[0016] As an alternative, the slurry pipe includes a first pipe, a second pipe, and a third pipe connected together. The first pipe is connected to the coating die head, and the third pipe is connected to the coating valve. The back suction pipe includes a fourth pipe and a fifth pipe connected together. The fourth pipe and the second pipe are arranged at an angle and connected together. The back suction drive is installed on the end of the fifth pipe away from the fourth pipe. The second pipe and the fourth pipe are constructed as a single unit.

[0017] As an optional solution, the coating apparatus further includes connectors, and the first tube, the second tube, the third tube, the fourth tube, and the fifth tube are all pipe fittings;

[0018] Wherein, two adjacent pipe fittings are connected by the aforementioned connectors; and / or

[0019] The body of the aforementioned suction drive and the aforementioned fifth tube are connected by the aforementioned connector.

[0020] As an optional solution, each of the aforementioned pipe fittings and the end of the connected pipe fittings are provided with a first flange protruding outwards, the first flange abutting against the first flange of the corresponding connected pipe fitting and being fixedly connected by the aforementioned connector; and / or

[0021] The end of the aforementioned suction drive body is provided with a second flange protruding outward, and the second flange abuts against the first flange at the corresponding end of the aforementioned fifth pipe and is fixedly connected by the aforementioned connector.

[0022] Both the first flange and the second flange mentioned above are edge portions, and the connecting parts mentioned above include:

[0023] Two hinged semi-circular portions, each of which has a receiving groove for accommodating the two edge portions;

[0024] A locking assembly includes a bolt and a locking member, one end of the bolt being hinged to the free end of one of the semi-ring portions, the free end of the other semi-ring portion having a groove, the bolt being rotatable into the groove and the free end of the bolt protruding from the groove, the locking member being threadedly connected to the bolt and abutting against the free end of the other semi-ring portion.

[0025] As an optional solution, the aforementioned locking component includes:

[0026] The locking part is threadedly connected to the free end of the aforementioned bolt;

[0027] The screwing part is connected to the locking part and is plate-shaped.

[0028] As an optional solution, the sealing assembly described above includes:

[0029] The piston is adapted to the inner diameter of the aforementioned suction pipe, and the piston is connected to the output end of the aforementioned suction drive component. A sealing groove is formed on the outer periphery of the piston.

[0030] The sealing element is housed in the aforementioned sealing groove and abuts against the inner wall of the aforementioned suction pipe.

[0031] The beneficial effects of this utility model are as follows:

[0032] This invention provides a coating device in which, during the coating gap, the output end of the back suction drive rapidly contracts, driving the sealing assembly to move away from the slurry pipe. Excess slurry can enter the back suction pipe. Since the sealing assembly seals and fills the back suction pipe, the slurry gradually enters the back suction pipe as the sealing assembly moves away, preventing the sealing assembly from agitating the slurry and significantly improving the absorption effect of the slurry. This also prevents slurry from overflowing from the coating die during the coating gap. At the same time, the sealing effect of the sealing assembly prevents slurry from entering the back suction drive, thus ensuring the long-term stable use of the back suction drive. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the coating device provided in an embodiment of the present invention;

[0034] Figure 2 This is a cross-sectional view of the back suction mechanism and slurry pipe provided in an embodiment of this utility model;

[0035] Figure 3 This is a schematic diagram of the back suction mechanism and slurry pipe provided in this embodiment of the utility model;

[0036] Figure 4 yes Figure 1 Enlarged view of point A in the middle.

[0037] In the picture:

[0038] 10. Coating die head; 20. Slurry pipe; 21. First pipe; 22. Second pipe; 23. Third pipe; 30. Coating valve; 40. Return valve;

[0039] 50. Back suction mechanism; 51. Back suction pipe; 511. Fourth pipe; 512. Fifth pipe; 5121. Slurry storage chamber; 52. Back suction valve assembly; 521. Back suction drive component; 522. Sealing assembly; 5221. Piston; 5222. Seal;

[0040] 60. Limit adjustment assembly; 61. Mounting plate; 611. Through hole; 62. Adjusting bolt; 63. Locking nut;

[0041] 71. First flange; 72. Second flange;

[0042] 80. Connector; 81. Semi-ring; 82. Locking assembly; 821. Bolt; 822. Locking element; 8221. Locking part; 8222. Tightening part; 83. Slot. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] This embodiment provides a coating apparatus that can significantly improve the absorption capacity of slurry during the coating interval, preventing slurry overflow from the coating die 10 during the coating interval. Figure 1 and Figure 2 As shown, the coating apparatus includes a coating die 10, a slurry pipe 20, a coating valve 30, and a return valve 40 connected in sequence. The coating valve 30 is configured to allow the slurry to flow out of the outlet of the coating die 10 after passing through the return valve 40, the coating valve 30, the slurry pipe 20, and the coating die 10 in sequence. When the coating die 10 is operated intermittently, the return valve 40 allows a portion of the slurry to flow back to the return valve 40. The coating valve 30, the return valve 40, and the coating die 10 are configured with... The body structure is quite common in the prior art and will not be described in detail here; in addition, the coating device also includes a back suction mechanism 50, which includes a back suction pipe 51 and a back suction valve assembly 52. ​​The back suction pipe 51 is connected to the slurry pipe 20. The back suction valve assembly 52 includes a back suction drive 521 and a sealing assembly 522. The sealing assembly 522 slides and seals against the inner wall of the back suction pipe 51. The back suction drive 521 can drive the sealing assembly 522 to reciprocate along the back suction pipe 51.

[0048] In the above-mentioned coating apparatus, during the coating gap, the output end of the back suction drive 521 rapidly contracts and drives the sealing component 522 to move away from the slurry pipe 20. Excess slurry can enter the back suction pipe 51. Since the sealing component 522 seals and fills the back suction pipe 51, during the movement of the sealing component 522, the slurry always gradually enters the back suction pipe 51 as the sealing component 522 moves away, avoiding the sealing component 522 from agitating the slurry. The absorption effect of the slurry is obvious, thereby preventing the slurry from overflowing from the coating die head 10 during the coating gap. At the same time, the sealing effect of the sealing component 522 can prevent the slurry from entering the interior of the back suction drive 521, thereby ensuring the long-term stable use of the back suction drive 521.

[0049] Optionally, such as Figure 2 As shown, the sealing assembly 522 includes a piston 5221 and a sealing element 5222. The piston 5221 is adapted to the inner diameter of the suction pipe 51, and is connected to the output end of the suction drive 521. A sealing groove (not shown in the figure) is formed on the outer periphery of the piston 5221. The sealing element 5222 is housed in the sealing groove and abuts against the inner wall of the suction pipe 51. Through the above arrangement, the sealing performance of the sealing assembly 522 can be ensured, preventing slurry from entering the suction drive 521.

[0050] Optionally, at least two seals 5222 are provided in the axial direction of the suction pipe 51 to further improve the sealing effect.

[0051] Optionally, piston 5221 is made of corrosion-resistant material, and its performance will not be affected by long-term use.

[0052] Optionally, the back suction drive 521 is a cylinder. Cylinders are characterized by rapid response, making them more suitable for coating equipment with short intermittent times. Combined with a solenoid valve, an 8ms cycle can be achieved, enabling high-speed intermittent coating at speeds >50m / min. Simultaneously, it features a simple structure, convenient operation and control, and lower overall cost.

[0053] Optionally, such as Figure 2 As shown, the back suction mechanism 50 is located on the upper side of the slurry pipe 20 to prevent the slurry from being stored in the back suction pipe 51 for a long time and thus entering the back suction drive component 521.

[0054] Since the stroke of the cylinder's output end is generally fixed, the position of the sealing component 522 near and away from the slurry pipe 20 is relatively fixed, resulting in a mismatch with the cylinder's output distance. To solve this problem, the coating apparatus also includes a limit adjustment component 60. The limit adjustment component 60 is installed inside the suction pipe 51 and located between the sealing component 522 and the slurry pipe 20. The limit adjustment component 60 is configured to limit the sealing component 522. Through the above setting, the limit adjustment component 60 restricts the extreme position of the sealing component 522 near the slurry pipe 20, preventing the output end of the suction drive 521 from extending too far during normal coating, causing the sealing component 522 to extend out of the suction pipe 51 and enter the slurry pipe 20, thus obstructing the liquid flow within the slurry pipe 20.

[0055] Optionally, at least part of the limit adjustment component 60 is adjustable in the axial direction of the suction pipe 51, so that the stroke of the sealing component 522 is adjustable. With the above settings, the limit position of the limit adjustment component 60 can be adjusted for different slurry flow rates, or, during on-site commissioning, the limit position of the sealing component 522 can be adjusted according to the state of the coating die head 10.

[0056] Optionally, such as Figure 2 As shown, the limit adjustment assembly 60 includes a mounting plate 61 and an adjusting bolt 62. The mounting plate 61 is installed inside the suction pipe 51 and located between the sealing assembly 522 and the slurry pipe 20. A through hole 611 is opened on the mounting plate 61. The adjusting bolt 62 is threadedly connected to the mounting plate 61. First, the through hole 611 on the mounting plate 61 ensures that the setting of the mounting plate 61 does not affect the slurry entering between the piston 5221 and the mounting plate 61 (that is, the slurry storage chamber 5121 indicated in the figure). The height of the adjusting bolt 62 can be adjusted by turning the adjusting bolt 62, thereby adjusting the stroke of the sealing assembly 522.

[0057] Optionally, the limit adjustment assembly 60 also includes a locking nut 63, which is threadedly connected to the adjusting bolt 62 and can abut against the mounting plate 61. When the locking nut 63 is loosened and disengaged from the mounting plate 61, the height of the adjusting bolt 62 relative to the mounting plate 61 can be adjusted by turning the adjusting bolt 62. After adjusting to a suitable height, the locking nut 63 is then turned to abut against the mounting plate 61 to prevent the adjusting bolt 62 from easily shaking and falling off. The piston 5221 can then abut against the adjusting bolt 62, thereby realizing the change of the limit position of the piston 5221.

[0058] In other embodiments, the adjusting bolt 62 may be configured to have a self-locking function, that is, there is no need to set a locking nut 63, which is not limited here.

[0059] Optionally, such as Figure 1 and Figure 3As shown, the slurry pipe 20 includes a first pipe 21, a second pipe 22, and a third pipe 23 connected together. The first pipe 21 is connected to the coating die head 10, and the third pipe 23 is connected to the coating valve 30. The suction pipe 51 includes a fourth pipe 511 and a fifth pipe 512 connected together. The fourth pipe 511 and the second pipe 22 are arranged at an angle and connected together. The suction drive 521 is installed at the end of the fifth pipe 512 opposite to the fourth pipe 511. The second pipe 22 and the fifth pipe 512 are constructed as a single piece. It can be understood that the second pipe 22 and the fifth pipe 512, after being integrally formed, form an inverted T-shaped tee pipe. On the one hand, this ensures the strength of the connection between the two pipes; on the other hand, the tee pipe is relatively easy to process and procure.

[0060] Optionally, such as Figures 1-3 As shown, the coating apparatus also includes a connector 80. The first tube 21, second tube 22, third tube 23, fourth tube 511, and fifth tube 512 are all tubes (not labeled). Adjacent tubes are connected by the connector 80. The body of the back suction drive 521 and the fifth tube 512 are connected by the connector 80. It is understandable that connecting two tubes or the body of the back suction drive 521 to a tube via the connector 80 simplifies the tube design and makes processing easier.

[0061] Optionally, see Figures 2-4 Each pipe fitting has a first flange 71 protruding outward from its end, which abuts against the first flange 71 of the corresponding pipe fitting and is fixedly connected by a connector 80. The end of the back suction drive 521 body has a second flange 72 protruding outward from its end, which abuts against the first flange 71 at the corresponding end of the fifth pipe 512 and is fixedly connected by a connector 80. Both the first flange 71 and the second flange 72 are edge portions (not labeled in the figure for ease of explanation). The connector 80 includes two hinged halves. The ring portion 81 and the locking assembly 82 each have a receiving groove (not marked) for accommodating two edge portions; the locking assembly 82 includes a bolt 821 and a locking member 822. One end of the bolt 821 is hinged to the free end of one of the half-ring portions 81, and the free end of the other half-ring portion 81 has a slot 83. The bolt 821 can be rotated into the slot 83 and the free end of the bolt 821 protrudes from the slot 83. The locking member 822 is threadedly connected to the bolt 821 and can abut against the free end of the other half-ring portion 81. With the above settings, when connecting the two pipe fittings or the pipe fitting and the body of the suction drive 521, the two edge parts are locked with the connector 80. Specifically, the two edge parts are placed in the receiving groove, the two semi-ring parts 81 are fastened together, and then the bolt 821 is rotated so that the bolt 821 enters the slot 83. Then the locking member 822 is locked with the bolt 821 until the locking member 822 abuts against the outer wall of the slot 83. This method is convenient and fast, the connection is reliable, and disassembly and assembly can be quickly achieved.

[0062] It should be noted that, as Figure 2 As shown, the first flange 71 of the fifth tube 512, which is close to the end of the fourth tube 511, extends inward to form a mounting plate 61. This arrangement facilitates the processing and forming of the mounting plate 61. At the same time, the mounting plate 61 is located at the end of the fifth tube 512, and the adjustment bolt 62 can be adjusted by removing the fifth tube 512.

[0063] Optionally, such as Figure 4 As shown, the locking component 822 includes a locking part 8221 and a tightening part 8222. The locking part 8221 is threadedly connected to the free end of the bolt 821; the tightening part 8222 is connected to the locking part 8221 and is arranged in a plate shape. With the above arrangement, it is convenient for a person to directly tighten the tightening part 8222, which is relatively labor-saving.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A coating apparatus, characterized in that, include: The coating die (10), slurry pipe (20), coating valve (30) and return valve (40) are connected in sequence. The coating valve (30) is configured to allow the slurry to flow out from the outlet of the coating die (10) after passing through the return valve (40), the coating valve (30), the slurry pipe (20) and the coating die (10) in sequence. The return valve (40) allows a portion of the slurry to flow back to the return valve (40). The back suction mechanism (50) includes a back suction pipe (51) and a back suction valve assembly (52). The back suction pipe (51) is connected to the slurry pipe (20). The back suction valve assembly (52) includes a back suction drive (521) and a sealing assembly (522). The sealing assembly (522) slides and seals against the inner wall of the back suction pipe (51). The back suction drive (521) can drive the sealing assembly (522) to reciprocate along the back suction pipe (51).

2. The coating apparatus according to claim 1, characterized in that, The back suction drive (521) is a cylinder.

3. The coating apparatus according to claim 2, characterized in that, The coating apparatus further includes a limiting adjustment component (60), which is installed inside the suction pipe (51) and located between the sealing component (522) and the slurry pipe (20). The limiting adjustment component (60) is configured to limit the sealing component (522).

4. The coating apparatus according to claim 3, characterized in that, At least part of the limiting adjustment assembly (60) is positional adjustable in the axial direction of the suction pipe (51) so that the stroke of the sealing assembly (522) is adjustable.

5. The coating apparatus according to claim 4, characterized in that, The limit adjustment assembly (60) includes: Mounting plate (61) is installed inside the suction pipe (51) and located between the sealing assembly (522) and the slurry pipe (20). A through hole (611) is provided on the mounting plate (61). Adjusting bolt (62) is threadedly connected to the mounting plate (61).

6. The coating apparatus according to any one of claims 1-5, characterized in that, The slurry pipe (20) includes a first pipe (21), a second pipe (22) and a third pipe (23) connected together. The first pipe (21) is connected to the coating die head (10), and the third pipe (23) is connected to the coating valve (30). The back suction pipe (51) includes a fourth pipe (511) and a fifth pipe (512) connected together. The fourth pipe (511) and the second pipe (22) are arranged at an angle and connected together. The back suction drive (521) is installed at the end of the fifth pipe (512) away from the fourth pipe (511). The second pipe (22) and the fourth pipe (511) are constructed as a single piece.

7. The coating apparatus according to claim 6, characterized in that, The coating device further includes a connector (80), wherein the first tube (21), the second tube (22), the third tube (23), the fourth tube (511), and the fifth tube (512) are all tubes; Wherein, two adjacent pipe fittings are connected by the connector (80); and / or The body of the back suction drive (521) and the fifth tube (512) are connected by the connector (80).

8. The coating apparatus according to claim 7, characterized in that, Each of the pipe fittings and the connected pipe fittings have a first flange (71) protruding outward from the end, the first flange (71) abutting against the first flange (71) of the corresponding connected pipe fitting and being fixedly connected by the connector (80); and / or The end of the back suction drive (521) body is provided with a second flange (72) protruding outward. The second flange (72) abuts against the first flange (71) at the corresponding end of the fifth pipe (512) and is fixedly connected by the connector (80). Both the first flange (71) and the second flange (72) are edge portions, and the connecting member (80) includes: Two hinged semi-ring portions (81), each of the semi-ring portions (81) having a receiving groove for receiving the two edge portions; The locking assembly (82) includes a bolt (821) and a locking member (822). One end of the bolt (821) is hinged to the free end of one of the semi-ring portions (81), and the free end of the other semi-ring portion (81) has a slot (83). The bolt (821) can rotate into the slot (83) and the free end of the bolt (821) protrudes from the slot (83). The locking member (822) is threadedly connected to the bolt (821) and can abut against the free end of the other semi-ring portion (81).

9. The coating apparatus according to claim 8, characterized in that, The locking member (822) includes: The locking part (8221) is threadedly connected to the free end of the bolt (821); The screwing part (8222) is connected to the locking part (8221) and is plate-shaped.

10. The coating apparatus according to any one of claims 1-5, characterized in that, The sealing assembly (522) includes: The piston (5221) is adapted to the inner diameter of the suction pipe (51), the piston (5221) is connected to the output end of the suction drive (521), and a sealing groove is formed on the outer periphery of the piston (5221). The sealing element (5222) is housed in the sealing groove and abuts against the inner wall of the suction pipe (51).

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