Gap coating valve mechanism and coating machine

Abstract

The utility model discloses a clearance coating valve mechanism and a coating machine, and relates to the technical field of lithium battery pole piece coating, the clearance coating valve mechanism comprises a feeding valve, and the feeding valve comprises a first valve main body, a first valve core and a first driving mechanism; a communicating opening is formed in the first valve element, and the communicating opening is covered with an elastic piece which can deform under the action of external force to enable the communicating opening to be in an open state. When the first valve element is opened, the first valve element moves upwards to extrude materials in the first piston cavity, the materials extrude the elastic piece through the communicating opening to deform the elastic piece, the communicating opening is opened, the materials in the first piston cavity flow back through the communicating opening, and therefore the problem that coating on the head is too thick is solved; when the feeding valve is closed, the first valve element moves downwards, materials on the side, away from the feeding direction of the coating die head, of the first valve element abut against the elastic piece, the elastic piece is closed to cover the communicating opening, and therefore a negative-pressure cavity is formed in the side, communicated with the coating die head, of the first piston cavity, and the problem that materials are dragged at the tail is solved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery pole piece coating, and in particular to a gap coating valve mechanism and a coating machine. Background Art

[0002] At present, in the gap coating of the lithium battery extrusion coating machine, the coating quality of the pole piece head and tail is achieved by controlling the switching timing of the feed valve and the reflux valve as well as the reflux pressure.

[0003] In actual production, a thick area beyond the process range is likely to appear in the 10mm-30mm interval from the head of the gap coating device, and the tail is prone to tailing and carrying. These two defects have adverse effects on the commissioning production and product quality. However, the existing coating valve mechanism has limited adjustment capabilities and it is difficult to solve these two types of coating defects. Therefore, it is urgent to provide a new solution to solve the above problems. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a gap coating valve mechanism and a coating machine to solve the technical problem that the existing coating valve mechanism has limited adjustment ability and is difficult to solve the head and tail coating defects.

[0005] In order to achieve the above technical purpose, the present application provides a gap coating valve mechanism, including a feed valve and a coating die head;

[0006] The feed end of the coating die head is connected to the feed valve through a first pipeline;

[0007] The feed valve comprises a first valve body, a first valve core and a first driving mechanism;

[0008] A first piston chamber is provided in the first valve body;

[0009] The first valve body is provided with a first inlet and outlet port and a second inlet and outlet port communicating with the first piston chamber;

[0010] The second inlet and outlet of the first valve body is connected to the first pipeline;

[0011] The first drive mechanism includes a first piston rod;

[0012] One end of the first piston rod is connected to the first valve core, and is used to drive the first valve core to move to block the first inlet and outlet or the second inlet and outlet, and control the opening and closing of the feed valve;

[0013] The first valve core is provided with a communication port penetrating through the first valve core;

[0014] An elastic sheet covering the communication port is installed on the side of the first valve core away from the first inlet and outlet or the second inlet and outlet;

[0015] The elastic sheet can be deformed under the action of external force so that the communication port is in an open state.

[0016] Further, part of the first valve core is used to block the first material inlet and outlet or the second material inlet and outlet to form a blocking portion;

[0017] The portion of the first valve core outside the blocking portion forms a main body;

[0018] When the blocking portion blocks the first inlet and outlet or the second inlet and outlet to close the feed valve, the first valve body cooperates with the main body to press against the elastic sheet to cover the communication port.

[0019] Furthermore, the communication port is opened on the main body;

[0020] A conducting gap is formed between the outer edge of the main body and the inner peripheral wall of the first piston chamber.

[0021] Furthermore, the first valve core is an inverted cone plugging structure;

[0022] The first valve core can extend into the second material inlet and outlet and form a blocking portion for the second material inlet and outlet, thereby forming the blocking portion.

[0023] Furthermore, an annular flange is provided on the outer peripheral surface of the main body at an edge away from the blocking portion;

[0024] The conducting gap is formed between the outer peripheral wall of the annular flange and the inner peripheral wall of the first piston chamber;

[0025] The communication port is opened on the annular flange.

[0026] Furthermore, the communication ports are multiple;

[0027] The elastic sheets are also in plurality and cover the communication openings one by one.

[0028] Furthermore, the communication ports are multiple;

[0029] The elastic sheet is one and is a ring sheet structure;

[0030] The elastic sheet covers all the communication openings.

[0031] Furthermore, a slot is provided on the first valve core;

[0032] The elastic sheet is inserted into the slot.

[0033] Further, it also includes a return valve;

[0034] The return valve comprises a second valve body, a second valve core and a second driving mechanism;

[0035] A second piston chamber is provided in the second valve body;

[0036] The second valve body is provided with a return port, a third inlet and outlet, and a fourth inlet and outlet communicating with the second piston chamber;

[0037] The return port is connected to a second pipeline;

[0038] The third inlet and outlet is connected to a third pipeline;

[0039] The fourth material inlet and outlet are connected to the first material inlet and outlet;

[0040] The second drive mechanism includes a second piston rod;

[0041] One end of the second piston rod is connected to the second valve core and is used to drive the second valve core to move so as to control the opening and closing of the return port.

[0042] The present application also discloses a coating machine, comprising the gap coating valve mechanism.

[0043] It can be seen from the above technical scheme that the gap coating valve mechanism designed in the present application is to open a connecting port on the first valve core of the feed valve and cover the connecting port with an elastic sheet that can be deformed under the action of external force to make the connecting port in an open state. Under this design, when the first valve core is opened, the first valve core moves up to squeeze the material in the first piston cavity, and the material squeezes the elastic sheet through the connecting port to deform it. The connecting port is opened, and the material in the first piston cavity flows back through the connecting port to the cavity of the first piston cavity away from the feeding direction of the coating die head, thereby solving the problem of excessive coating on the head; when the feed valve is closed, the first valve core moves down, and the elastic sheet presses the elastic sheet against the material on the side of the first valve core away from the feeding direction of the coating die head, so that the elastic sheet closes and covers the connecting port, so that the first piston cavity is connected to the coating die head to form a negative pressure cavity, solving the problem of tail drag. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1 A schematic diagram of the structure of a gap coating valve mechanism provided in this application;

[0046] Figure 2It is a partial structural enlarged schematic diagram of a feed valve of a gap coating valve mechanism provided in the present application;

[0047] Figure 3 A schematic diagram of slurry flow during the opening process of a first valve core of a feed valve of a gap coating valve mechanism provided in the present application;

[0048] Figure 4 A schematic diagram of slurry flow during the closing process of the first valve core of a feed valve of a gap coating valve mechanism provided in the present application;

[0049] In the figure: 11, third pipeline; 12, first pipeline; 13, second pipeline; 2, coating die; 3, feed valve; 30, first valve body; 301, first piston chamber; 302, conduction gap; 31, first valve core; 311, blocking part; 312, main body; 313, annular flange; 314, connecting port; 32, first piston rod; 33, first driving mechanism; 34, elastic sheet; 4, return valve; 40, second valve body; 401, second piston chamber; 41, second valve core; 42, second piston rod; 43, second driving mechanism; 5, pressure regulating valve. DETAILED DESCRIPTION

[0050] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

[0051] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0052] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0053] The embodiment of the present application discloses a gap coating valve mechanism.

[0054] See also Figure 1 as well as Figure 2 , an embodiment of a gap coating valve mechanism provided in the embodiments of the present application includes:

[0055] The feed valve 3 and the coating die 2, the feed valve 3 is connected to the feed end of the coating die 2 through a first pipe 12; the first pipe can be a 90° elbow pipe, which is designed to vary according to the position distribution between the coating die 2 and the feed valve 3 without limitation.

[0056] The feed valve 3 includes a first valve body 30 , a first valve core 31 and a first driving mechanism 33 .

[0057] The first valve body 30 is provided with a first piston cavity 301; the first valve body 30 is provided with a first inlet and outlet port and a second inlet and outlet port connected to the first piston cavity 301; the second inlet and outlet port of the first valve body 30 is connected to the first pipeline 12; the first driving mechanism 33 includes a first piston rod 32; one end of the first piston rod 32 is connected to the first valve core 31, which is used to drive the first valve core 31 to move to block the first inlet and outlet port or the second inlet and outlet port, and control the opening and closing of the feed valve 3. The first valve core 31 is installed in the first piston cavity 301, and the first piston rod 32 is movably inserted on the first valve body 30, and one end extends into the first piston cavity 301 and is connected to the first valve core 31; the first valve core 31 can be a limiter sleeved on the first piston rod 32, and the first piston rod 32 is fixed on the first piston rod 32 to limit the displacement of the two ends of the first valve core 31. The design can be changed with reference to the existing valve core installation and fixing structure; and the first driving mechanism 33 can be a linear displacement driving mechanism such as a cylinder push rod, an electric telescopic rod, etc., which is not specifically limited.

[0058] The first valve core 31 is provided with a connecting port 314 penetrating through the first valve core 31; an elastic sheet 34 covering the connecting port 314 is installed on the side of the first valve core 31 away from the first inlet and outlet or the second inlet and outlet; the elastic sheet 34 can be deformed under the action of external force to make the connecting port 314 in an open state.

[0059] When the feed valve 3 is opened, the first valve core 31 moves upward to squeeze the material in the first piston chamber 301. The material squeezes the elastic sheet 34 through the connecting port 314 to deform it. The connecting port 314 opens, and the material in the first piston chamber 301 flows back through the connecting port 314 to the cavity of the first piston chamber 301 away from the feeding direction of the coating die head 2, thereby solving the problem of excessive coating on the head; when the feed valve 3 is closed, the first valve core 31 moves downward, and the elastic sheet 34 is pressed against the elastic sheet 34 by the material on the side of the first valve core 31 away from the feeding direction of the coating die head 2, so that the elastic sheet 34 closes and covers the connecting port 314, thereby forming a negative pressure cavity on the side of the first piston chamber 301 connected to the coating die head 2, solving the problem of material dragging at the tail.

[0060] When the elastic sheet 34 in the present application is not subject to external force, it can be just attached to the first valve core 31 to cover and shield the connecting port 314, or it can have a certain elastic force so that the elastic sheet 34 is in a state of pressing the first valve core 31 to cover and shield the connecting port 314, and there is no specific limitation.

[0061] The above is an embodiment of a gap coating valve mechanism provided in the embodiment of the present application. The following is an embodiment of a gap coating valve mechanism provided in the embodiment of the present application. For details, please refer to Figures 1 to 4 .

[0062] Based on the solution of the above embodiment 1:

[0063] Furthermore, structurally speaking, part of the first valve core 31 is used to block the first inlet and outlet / the second inlet and outlet to form a blocking portion 311 , and the part of the first valve core 31 outside the blocking portion 311 forms a main body 312 .

[0064] When the blocking portion 311 blocks the first inlet and outlet or the second inlet and outlet to close the feed valve 3 , the first valve body 30 cooperates with the main body 312 to press against the elastic sheet 34 to cover the communication port 314 .

[0065] The first inlet and outlet in the present application is arranged on one side of the first valve body 30, and the second inlet and outlet is arranged at the upper position inside the first valve body 30. Taking this as an example, the first valve core 31 is used to block the second inlet and outlet.

[0066] Furthermore, the connecting port 314 is provided on the main body 312; a conducting gap 302 is formed between the outer edge of the main body 312 and the inner peripheral wall of the first piston chamber 301 for the slurry to pass through. An elastic sheet 34 is installed on the side of the main body 312 facing the first inlet and outlet to cover the connecting port 314. Specifically, when the first valve core 31 moves upward to open the second inlet and outlet, the elastic sheet 34 is deformed under the action of the slurry at the front end of the first valve core 31 to open the connecting port 314, and the slurry coated on the front end of the first valve core 31 flows back through the connecting port 314, thereby solving the problem of excessive thickness of the head coating; when the first valve core 31 retreats to close the second inlet and outlet, the elastic sheet 34 recovers its deformation and presses the main body 312 under the action of the slurry at the back of the first valve core 31 to close the connecting port 314. At this time, a negative pressure area is formed in the front end cavity of the first valve core 31, thereby solving the problem of tail dragging. The front slurry mentioned above is the slurry flowing through the second inlet and outlet, and the back slurry is the slurry flowing through the first inlet and outlet.

[0067] Further, taking the first valve core 31 as an inverted cone plugging structure as an example, the first valve core 31 can extend into the second inlet and outlet and form a blocking portion for the second inlet and outlet, forming a blocking portion 311. Figure 2 As shown, the portion of the first valve core 31 below the position in contact with the second material inlet and outlet can be regarded as the blocking portion 311 , and the portion above the contact position can be regarded as the main body 312 .

[0068] It should be noted that the first valve core 31 of the design of the present application can also be a non-inverted cone design, but the coating quality of the product will be reduced to a certain extent. The inverted cone valve core design has a certain guiding effect. When the feeding is stopped, the first valve core 31 can be quickly and accurately closed when it descends, and it is not easy to leave a gap. When the first valve body 30 starts feeding or stops feeding, the inverted cone valve core design is compared with the non-inverted cone valve core design. The movement of the slurry is smoother, the pressure in the valve cavity is more stable, and the head and tail coating quality is better. Therefore, the inverted cone design is preferred.

[0069] Furthermore, an annular flange 313 is integrally provided on the outer peripheral surface of the main body 312 at an edge position away from the sealing portion 311, and a conducting gap 302 is formed between the outer peripheral wall of the annular flange 313 and the inner peripheral wall of the first piston chamber 301. While forming the required conducting gap 302, it also provides convenience for opening the connecting port 314, making it convenient to open the connecting port 314 on the annular flange 313.

[0070] Taking the non-inverted cone design as an example, if the first valve core 31 is a T-block design, then there is no need to add an additional annular flange 313 design.

[0071] Furthermore, the communication opening 314 can be designed to be multiple; correspondingly, the elastic sheet 34 can also be designed to be multiple, covering the communication openings 314 one by one.

[0072] Of course, when there are multiple communication ports 314, the elastic sheet 34 can also be designed as only one. In this case, the elastic sheet 34 is a ring sheet structure, so that one elastic sheet 34 covers all the communication ports 314. The design of multiple elastic sheets 34 covering the communication ports 314 one by one is more complicated in parts processing and component assembly. When the valve body is fed, the elastic sheet 34 is easily rotated due to the flow of slurry. The elastic sheet 34 with a ring sheet structure can cover the communication port 314 no matter how much it rotates. If the design of multiple elastic sheets 34 rotates, it cannot accurately cover the communication port 314. Therefore, in comparison of the two design schemes, the ring sheet structure design scheme is preferred.

[0073] Furthermore, as for the installation and fixing design of the elastic piece 34 , a slot is provided on the main body 312 , and the elastic piece 34 is inserted into the slot.

[0074] Furthermore, a return valve 4 is also included.

[0075] The design of the return valve 4 includes a second valve body 40 , a second valve core 41 and a second driving mechanism 43 .

[0076] A second piston cavity 401 is provided in the second valve body 40; a return port, a third inlet and outlet, and a fourth inlet and outlet communicating with the second piston cavity 401 are provided on the second valve body 40;

[0077] The return port is connected with a second pipeline 13;

[0078] The third inlet and outlet are connected to a third pipeline 11;

[0079] The fourth material inlet and outlet are connected to the first material inlet and outlet;

[0080] The second driving mechanism 43 includes a second piston rod 42; one end of the second piston rod 42 is connected to the second valve core 41, which is used to drive the second valve core 41 to move to control the opening and closing of the return port; the specific design or modified design or continued use can refer to the existing three-way return valve 4 structure, and no further details will be given.

[0081] Furthermore, a pressure regulating valve 5 is installed on the second pipeline 13 to further enhance the regulating function.

[0082] The working principle of the gap coating valve mechanism designed in this application is as follows:

[0083] like Figure 1 as well as Figure 3 As shown:

[0084] 1. During the head process, the second piston rod 42 is driven to retract, and the second valve core 41 closes the return port; the first piston rod 32 is driven to extend, and the first valve core 31 immediately opens the second inlet and outlet; the slurry moves along the direction of the third pipeline 11-return valve 4-feed valve 3-first pipeline 12.

[0085] 2. When the first valve core 31 is opened, the elastic sheet 34 is compressed and bent, and part of the slurry flows to the connecting port 314 on the first valve core 31, and the supply amount in the head coating area is reduced, thereby solving the problem that the thick coating area of ​​the head exceeds the process range.

[0086] 3. After the first valve core 31 is fully opened, the elastic member fits with the first valve core 31 to block the communication port 314 , and all the slurry is supplied to the coating die head 2 .

[0087] like Figure 1 as well as Figure 4 As shown:

[0088] 1. During the tail process, the second piston rod 42 is driven to extend, and the second valve core 41 opens the return port; the first piston rod 32 is driven to retract, and the first valve core 31 immediately closes the second inlet and outlet; the slurry moves along the third pipeline 11-return valve 4-pressure regulating valve 5-second pipeline 13 outlet direction.

[0089] 2. When the first valve core 31 closes the second inlet and outlet, the elastic sheet 34 fits tightly against the first valve core 31, and a negative pressure area is formed above the first valve core 31. Before the first valve core 31 is completely closed, the slurry flows to this negative pressure area, so that the coating tail is fully cut off, thereby solving the problem of tail dragging.

[0090] The present application also discloses a coating machine, comprising the above-mentioned gap coating valve mechanism.

[0091] The above is a detailed introduction to a gap coating valve mechanism and a coating machine provided by the present application. For a person skilled in the art, according to the idea of ​​the embodiments of the present application, there may be changes in the specific implementation method and the scope of application. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A gap coating valve mechanism, characterized in that: It includes a feed valve (3) and a coating die head (2); The feed end of the coating die head (2) is connected to the feed valve (3) via a first pipeline (12); The feed valve (3) comprises a first valve body (30), a first valve core (31) and a first driving mechanism (33); A first piston chamber (301) is provided in the first valve body (30); The first valve body (30) is provided with a first inlet and outlet port and a second inlet and outlet port communicating with the first piston chamber (301); The second inlet and outlet of the first valve body (30) is connected to the first pipeline (12); The first driving mechanism (33) comprises a first piston rod (32); One end of the first piston rod (32) is connected to the first valve core (31) and is used to drive the first valve core (31) to move so as to block the first inlet and outlet or the second inlet and outlet, and control the opening and closing of the feed valve (3); The first valve core (31) is provided with a communication port (314) penetrating the first valve core; An elastic sheet (34) is installed on the side of the first valve core (31) facing away from the first inlet and outlet or the second inlet and outlet to cover the communication port (314); The elastic sheet (34) can be deformed under the action of an external force so that the communication port (314) is in an open state.

2. The gap coating valve mechanism according to claim 1, characterized in that: The portion of the first valve core (31) is used to block the first material inlet and outlet or the second material inlet and outlet to form a blocking portion (311); The portion of the first valve core (31) outside the blocking portion (311) forms a main body portion (312); When the blocking portion (311) blocks the first material inlet and outlet or the second material inlet and outlet to close the feed valve (3), the first valve body (30) cooperates with the main body (312) to press against the elastic sheet (34) to cover the communication port (314).

3. The gap coating valve mechanism according to claim 2, characterized in that: The communication port (314) is provided on the main body (312); A conducting gap (302) is formed between the outer edge of the main body (312) and the inner peripheral wall of the first piston chamber (301).

4. The gap coating valve mechanism according to claim 2, characterized in that: The first valve core (31) is an inverted cone-shaped plugging structure; The first valve core (31) can extend into the second material inlet and outlet and form a blocking portion for the second material inlet and outlet, thereby forming the blocking portion (311).

5. The gap coating valve mechanism according to claim 3, characterized in that: An annular flange (313) is provided on the outer peripheral surface of the main body (312) at an edge position away from the blocking portion (311); The conducting gap (302) is formed between the outer peripheral wall of the annular flange (313) and the inner peripheral wall of the first piston chamber (301); The communication port (314) is opened on the annular flange (313).

6. The gap coating valve mechanism according to claim 1, characterized in that: The communication openings (314) are multiple; The elastic sheets (34) are also multiple and cover the communicating openings (314) one by one.

7. The gap coating valve mechanism according to claim 1, characterized in that: The communication openings (314) are multiple; The elastic sheet (34) is one and has a ring sheet structure; The elastic sheet (34) covers each of the communication openings (314) together.

8. The gap coating valve mechanism according to claim 1, characterized in that: The first valve core (31) is provided with a slot; The elastic sheet (34) is inserted into the slot.

9. The gap coating valve mechanism according to claim 1, characterized in that: Also includes a return valve (4); The return valve (4) comprises a second valve body (40), a second valve core (41) and a second driving mechanism (43); A second piston chamber (401) is provided in the second valve body (40); The second valve body (40) is provided with a return port, a third inlet and outlet port, and a fourth inlet and outlet port connected to the second piston chamber (401); The return port is connected to a second pipeline (13); The third inlet and outlet is connected to a third pipeline (11); The fourth material inlet and outlet are connected to the first material inlet and outlet; The second driving mechanism (43) comprises a second piston rod (42); One end of the second piston rod (42) is connected to the second valve core (41) and is used to drive the second valve core (41) to move so as to control the opening and closing of the return port.

10. A coating machine, characterized in that Comprising the gap coating valve mechanism according to any one of claims 1 to 9.

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