Valve element assembly and gap coating feeding valve

Abstract

The utility model discloses a valve element assembly and a clearance coating feeding valve, and relates to the technical field of lithium battery pole piece coating, and the valve element assembly comprises a valve body, a valve element and a piston rod. A communicating port is formed in a main body part of a valve element, and an elastic piece which can deform under the action of external force to enable the communicating port to be in an open state covers the communicating port. According to the design, when the valve element is opened, the valve element moves upwards to extrude materials in the 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 piston cavity flow back into a cavity body, deviating from the feeding direction of the coating die head, of the piston cavity through the communicating opening, and therefore the problem that coating of the head is too thick is solved; when the valve element is closed, the valve element moves downwards, materials on the side, away from the feeding direction of the coating die head, of the 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 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 valve core assembly and a gap coating feed valve. 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 the present application is to provide a valve core assembly and a gap coating feed valve 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 valve core assembly, including a valve body, a valve core and a piston rod;

[0006] A piston chamber is provided in the valve body;

[0007] The valve body is provided with a first inlet and outlet port and a second inlet and outlet port communicating with the piston chamber;

[0008] The valve core is installed in the piston chamber;

[0009] The piston rod is connected to the valve core and is used to drive the valve core to move so as to control the opening and closing of the first inlet and outlet or the second inlet and outlet;

[0010] The valve core is provided with a communication port penetrating the valve core;

[0011] An elastic sheet covering the communication port is installed on the side of the valve core away from the first inlet and outlet or the second inlet and outlet;

[0012] The elastic sheet can be deformed under the action of external force so that the communication port is in an open state.

[0013] Further, part of the valve core is used to block the first inlet and outlet or the second inlet and outlet to form a blocking portion;

[0014] The portion of the valve core outside the blocking portion forms a main body;

[0015] When the blocking portion blocks the first material inlet and outlet or the second material inlet and outlet to close the valve core, the valve body cooperates with the main body to press against the elastic sheet to cover the communication port.

[0016] Furthermore, the communication port is opened on the main body;

[0017] A conducting gap is formed between the outer edge of the main body and the inner peripheral wall of the piston chamber.

[0018] Furthermore, the valve core is an inverted cone plugging structure;

[0019] The 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.

[0020] Furthermore, an annular flange is provided on the outer peripheral surface of the main body at an edge away from the blocking portion;

[0021] The conducting gap is formed between the outer peripheral wall of the annular flange and the inner peripheral wall of the piston chamber;

[0022] The communication port is opened on the annular flange.

[0023] Furthermore, the communication ports are multiple;

[0024] The elastic sheets are also in plurality and cover the communication openings one by one.

[0025] Furthermore, the communication ports are multiple;

[0026] The elastic sheet is one and is a ring sheet structure;

[0027] The elastic sheet covers all the communication openings.

[0028] Furthermore, a slot is provided on the valve core;

[0029] The elastic sheet is inserted into the slot.

[0030] The present application also discloses a gap coating feed valve, including a driving mechanism and the valve core assembly;

[0031] The driving mechanism is connected to the piston rod of the valve core assembly and is used to drive the valve core of the valve core assembly to move by driving the piston rod to move.

[0032] It can be seen from the above technical scheme that the valve core assembly designed in this application is provided with a connecting port on the main body of the valve core, and an elastic sheet is covered on the connecting port which can be deformed under the action of external force so that the connecting port is in an open state. Under this design, when the valve core is opened, the valve core moves upward to squeeze the material in the piston cavity, and the material squeezes the elastic sheet through the connecting port to deform it. When the connecting port is opened, the material in the piston cavity flows back through the connecting port to the cavity of the piston cavity away from the feeding direction of the coating die head, thereby solving the problem of excessive coating on the head; when the valve core is closed, the valve core moves downward, and the elastic sheet presses against the material on the side of the valve core away from the feeding direction of the coating die head, so that the elastic sheet closes and covers the connecting port, thereby forming a negative pressure cavity on the side of the piston cavity connected to the coating die head, solving the problem of tail dragging. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 A schematic diagram of a partial structure of a valve core assembly provided in this application;

[0035] Figure 2 This is a schematic diagram of the structure of a gap coating feed valve provided in this application with a connecting pipeline and a coating die head;

[0036] Figure 3 A schematic diagram of slurry flow during the valve core opening process of a valve core assembly provided in this application;

[0037] Figure 4 A schematic diagram of slurry flow during a valve core closing process of a valve core assembly provided in the present application;

[0038] In the figure: 10, valve body; 101, piston chamber; 102, conduction gap; 11, valve core; 111, sealing part; 112, main body; 113, annular flange; 114, connecting port; 12, piston rod; 13, driving mechanism; 14, elastic sheet; 2, connecting pipe; 3, coating die head. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] An embodiment of the present application discloses a valve core assembly.

[0043] See also Figure 1 , an embodiment of a valve core assembly provided in the embodiments of the present application includes:

[0044] The valve body 10 , the valve element 11 and the piston rod 12 .

[0045] The valve body 10 is connected to the feeding end of the coating die head 3 through the connecting pipe 2 .

[0046] A piston cavity 101 is provided in the valve body 10; a first inlet and outlet and a second inlet and outlet connected to the piston cavity 101 are provided on the valve body 10; a valve core 11 is installed in the piston cavity 101; a piston rod 12 is connected to the valve core 11, and is used to drive the valve core 11 to move, so as to control the opening and closing of the first inlet and outlet or the second inlet and outlet. The valve core 11 is installed in the piston cavity 101; the piston rod 12 is movably inserted into the valve body 10, and one end of the piston rod 12 extends into the piston cavity 101 and is connected to the valve core 11, and is used to drive the valve core 11 to move, so as to control the opening and closing of the first inlet and outlet or the second inlet and outlet; the valve core 11 can be sleeved on the piston rod 12, and the piston rod 12 is fixed with a limiter for limiting the displacement of the two ends of the valve core 11. This design can be modified with reference to the existing valve core installation and fixing structure, and will not be described in detail.

[0047] The valve core 11 is provided with a communication port 114 penetrating the valve core 11; an elastic sheet 14 covering the communication port 114 is installed on the side of the valve core 11 away from the first inlet and outlet or the second inlet and outlet; the elastic sheet 14 can be deformed under the action of external force to make the communication port 114 in an open state.

[0048] When the valve core 11 is opened, the valve core 11 moves upward to squeeze the material in the piston chamber 101, and the material squeezes the elastic sheet 14 through the connecting port 114 to deform it. The connecting port 114 opens, and the material in the piston chamber 101 flows back through the connecting port 114 to the cavity of the piston chamber 101 away from the feeding direction of the coating die 3, thereby solving the problem of excessive coating on the head; when the valve core 11 is closed, the valve core 11 moves downward, and the elastic sheet 14 is pressed against the elastic sheet 14 by the material on the side of the valve core 11 away from the feeding direction of the coating die 3, so that the elastic sheet 14 closes and covers the connecting port 114, thereby forming a negative pressure cavity on the side of the piston chamber 101 connected to the coating die 3, solving the problem of material dragging at the tail.

[0049] When the elastic sheet 14 in the present application is not subject to external force, it can be just attached to the main body 112 to cover and shield the connecting port 114, or it can have a certain elastic force so that the elastic sheet 14 is in a state of pressing the main body 112 to cover and shield the connecting port 114, and there is no specific limitation.

[0050] The above is an embodiment of a valve core assembly provided in the embodiment of the present application. The following is an embodiment of a valve core assembly provided in the embodiment of the present application. For details, please refer to Figure 1 .

[0051] Based on the solution of the above embodiment 1:

[0052] Furthermore, part of the valve core 11 is used to block the first inlet and outlet or the second inlet and outlet to form a blocking portion 111 ; the part of the valve core 11 outside the blocking portion 111 forms a main body 112 .

[0053] When the blocking portion 111 blocks the first inlet and outlet or the second inlet and outlet to close the valve core 11 , the valve body 10 and the main body 112 cooperate to press the elastic sheet 14 to cover the communication port 114 .

[0054] The first inlet and outlet in the present application is arranged on one side of the valve body 10, and the second inlet and outlet is arranged at the upper position inside the valve body 10. The second inlet and outlet are connected to the connecting pipe. Taking this as an example, the valve core 11 is used to block the second inlet and outlet.

[0055] Furthermore, the connecting port 114 is provided on the main body 112, and a conducting gap 102 is formed between the outer edge of the main body (112) and the inner peripheral wall of the piston cavity 101 for the slurry to pass through. An elastic sheet 14 is installed on the side of the main body 112 facing the first inlet and outlet to cover the connecting port 114. Specifically, when the valve core 11 moves upward to open the first inlet and outlet, the elastic sheet 14 is deformed under the action of the slurry at the front end of the valve core 11 to open the connecting port 114, and the slurry coated on the front end of the valve core 11 flows back through the connecting port 114, thereby solving the problem of excessive thickness of the head coating; when the valve core 11 moves downward to close the first inlet and outlet, the elastic sheet 14 recovers its deformation and presses the main body 112 under the action of the slurry on the back of the valve core 11 to close the connecting port 114. At this time, a negative pressure area is formed in the front end cavity of the valve core 11, 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.

[0056] Further, taking the valve core 11 as an inverted cone plugging structure as an example, the valve core 11 can extend into the second inlet and outlet and form a blocking portion for the second inlet and outlet, forming a blocking portion 111. Figure 1 As shown, the portion of the valve core 11 below the position in contact with the second material inlet and outlet can be regarded as the blocking portion 111 , and the portion above the contact position can be regarded as the main body 112 .

[0057] It should be noted that the valve core 11 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 valve core 11 can be quickly and accurately closed when it descends, and it is not easy to leave a gap. When the valve body 10 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.

[0058] Furthermore, an annular flange 113 is provided on the outer peripheral surface of the main body 112 at an edge position away from the sealing portion 111, and the outer peripheral wall of the annular flange 113 and the inner peripheral wall of the piston chamber 101 are used to form a conducting gap 102. While forming the required conducting gap 102, it also provides convenience for opening the connecting port 114, making it convenient to open the connecting port 114 on the annular flange 113.

[0059] Taking the non-inverted cone design as an example, if the valve core 11 is a T-block design, then there is no need to add an additional annular flange 113 design.

[0060] Furthermore, the communication opening 114 can be designed to be multiple, and correspondingly, the elastic sheet 14 can also be designed to be multiple, covering the communication openings 114 one by one.

[0061] Of course, when there are multiple communication ports 114, the elastic sheet 14 can also be designed as only one. In this case, the elastic sheet 14 is a ring sheet structure, so that one elastic sheet 14 covers all the communication ports 114. The design of multiple elastic sheets 14 covering the communication ports 114 one by one is more complicated in parts processing and component assembly. When the valve body is fed, the elastic sheet 14 is easily rotated due to the flow of slurry. The elastic sheet 14 with a ring sheet structure can cover the communication port 114 no matter how much it rotates. If the design of multiple elastic sheets 14 rotates, it cannot accurately cover the communication port 114. Therefore, in comparison of the two design schemes, the ring sheet structure design scheme is preferred.

[0062] Furthermore, as for the installation and fixing design of the elastic piece 14 , a slot is provided on the main body 112 , and the elastic piece 14 is inserted into the slot.

[0063] like Figure 4 As shown, the present application also discloses a gap coating feed valve, including a driving mechanism 13 and the above-mentioned valve core assembly, the driving mechanism 13 is connected to the piston rod 12 of the valve core assembly, and is used to drive the valve core 11 of the valve core assembly to move by driving the piston rod 12. The driving mechanism 13 can be a linear driving mechanism 13 such as a telescopic cylinder, an electric push rod, etc., without limitation.

[0064] The driving mechanism 13 is connected to the other end of the piston rod 12 of the valve core assembly, and is used to drive the valve core 11 to move so as to control the opening and closing of the first inlet and outlet.

[0065] The application of the intermittent coating feed valve in the coating mechanism is as follows: the first inlet and outlet of the intermittent coating feed valve are connected to the second inlet and outlet of the return valve, the second inlet and outlet of the intermittent coating feed valve is connected to the coating die head 3 through the connecting pipe 2, the first inlet and outlet of the return valve is connected to the feed pipe, and the return port of the return valve is connected to the return pipe.

[0066] The working principle of the gap coating feed valve designed in this application is as follows:

[0067] like Figures 1 to 3 As shown:

[0068] 1. During the head process, close the reflux port of the return valve; drive the piston rod 12 to extend, and the valve core 11 immediately opens the second inlet and outlet; the slurry moves along the feed pipe-return valve-feed valve-connecting pipe 2 direction.

[0069] 2. When the valve core 11 is opened, the elastic sheet 14 is compressed and bent, and part of the slurry flows to the connecting port 114 on the valve core 11, 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.

[0070] 3. After the valve core 11 is fully opened, the elastic member fits against the valve core 11 to block the communication port 114 , and all the slurry is supplied to the coating die head 3 .

[0071] like Figure 1 , Figure 2 as well as Figure 4 As shown:

[0072] 1. During the tail process, the return port is opened; the piston rod 12 is driven to retract, and the valve core 11 immediately closes the second inlet and outlet; the slurry moves along the direction of the feed pipe-return valve-return pipe outlet.

[0073] 2. When the valve core 11 closes the second inlet and outlet, the elastic sheet 14 fits tightly against the valve core 11, and a negative pressure area is formed above the valve core 11. Before the valve core 11 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.

[0074] The above is a detailed introduction to a valve core assembly and a gap coating feed valve provided by the present application. For a person skilled in the art, according to the ideas of the embodiments of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A valve core assembly, characterized in that: It comprises a valve body (10), a valve core (11) and a piston rod (12); A piston chamber (101) is provided in the valve body (10); The valve body (10) is provided with a first inlet and outlet port and a second inlet and outlet port communicating with the piston chamber (101); The valve core (11) is installed in the piston chamber (101); The piston rod (12) is connected to the valve core (11) and is used to drive the valve core (11) to move so as to control the opening and closing of the first inlet and outlet or the second inlet and outlet; The valve core (11) is provided with a communication port (114) penetrating the valve core; An elastic sheet (14) is installed on the side of the valve core (11) facing away from the first material inlet and outlet or the second material inlet and outlet to cover the communication port (114); The elastic sheet (14) can be deformed under the action of an external force so that the communication port (114) is in an open state.

2. The valve core assembly according to claim 1, characterized in that: Part of the valve core (11) is used to block the first material inlet and outlet or the second material inlet and outlet to form a blocking portion (111); The portion of the valve core (11) outside the blocking portion (111) forms a main body portion (112); When the blocking portion (111) blocks the first material inlet and outlet or the second material inlet and outlet to close the valve core (11), the valve body (10) and the main body (112) cooperate to press against the elastic sheet (14) to cover the communication port (114).

3. The valve core assembly according to claim 2, characterized in that: The communication port (114) is provided on the main body (112); A conducting gap (102) is formed between the outer edge of the main body (112) and the inner peripheral wall of the piston chamber (101).

4. The valve core assembly according to claim 2, characterized in that: The valve core (11) is an inverted cone plugging structure; The valve core (11) 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 (111).

5. The valve core assembly according to claim 3, characterized in that: An annular flange (113) is provided on the outer peripheral surface of the main body (112) at an edge position away from the blocking portion (111); The conduction gap (102) is formed between the outer peripheral wall of the annular flange (113) and the inner peripheral wall of the piston chamber (101); The communication port (114) is opened on the annular flange (113).

6. The valve core assembly according to claim 1, characterized in that: The communication openings (114) are multiple; The elastic sheets (14) are also multiple and cover the communication openings (114) one by one.

7. The valve core assembly according to claim 1, characterized in that: The communication openings (114) are multiple; The elastic sheet (14) is one and has a ring sheet structure; The elastic sheet (14) covers each of the communication openings (114) together.

8. The valve core assembly according to claim 1, characterized in that: The valve core (11) is provided with a slot; The elastic sheet (14) is inserted into the slot.

9. Gap coating feed valve, characterized in that, It comprises a driving mechanism (13) and a valve core assembly according to any one of claims 1 to 8; The driving mechanism (13) is connected to the piston rod (12) of the valve core assembly, and is used to drive the valve core (11) of the valve core assembly to move by driving the piston rod (12) to move.

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