Intermittent coating valve

Abstract

The utility model relates to the technical field of coating equipment, and discloses an intermittent coating valve. The slurry valve comprises a valve body, the valve body is provided with a flow channel used for slurry circulation, and the flow channel is provided with a feeding port and a discharging port; the valve element is arranged in the flow channel in a sliding mode, and the valve element is used for movably sealing the feeding opening; and the pressure compensation assembly is arranged in the flow channel in a sliding mode and abuts against the inner side wall of the flow channel, the pressure compensation assembly and the valve element are arranged in a spaced mode, and the pressure compensation assembly and the valve element synchronously ascend and descend. The utility model has the technical effects that the valve core and the pressure compensation component move synchronously, the valve body realizes pressure compensation, and the problem that the coating head is too thick and the tail is too thin is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coating equipment, and specifically relates to an intermittent coating valve. BACKGROUND

[0002] The pole piece of a lithium ion battery is usually made of foil coated with positive and negative electrode materials on the surface, and an intermittent valve is mainly used to control the coating time and coating amount of the slurry during the pole piece coating process, so that the pole piece achieves a specific coating effect.

[0003] In the related art, the intermittent valve usually comprises a valve body, a flow channel for slurry flow is arranged in the valve body, a communication port is arranged in the flow channel, a valve core is slidably arranged at the communication port, when the valve core is at the communication port, the valve core is sealed with the valve body to block the flow of the slurry, and when the valve core is away from the communication port, the slurry flows in the flow channel, the valve body is communicated with a coating die to realize pole piece coating, and the intermittent valve provides intermittent feeding.

[0004] However, when the intermittent valve is coated, the valve core quickly rises or falls, and the valve core often needs to move 3-5 mm in a time range of 8-15 ms, the valve core movement includes the reciprocating action process of acceleration, uniform speed and deceleration, and the valve core reciprocating movement per second is 3-4 times, that is, the valve core moves 6-8 times. The process of rapid lifting and lowering of the valve core can cause the pressure in the valve body to change rapidly, thereby easily causing the problems of abnormal coating thickness in the head region at the beginning of coating or the tail region at the end of coating, the pole piece coating is generally characterized by thick head and thin tail, and the pole piece is prone to uneven coating. Therefore, it is necessary to provide a coating valve capable of guaranteeing coating frequency and improving the stability of the pressure in the valve body, so as to improve the uniformity and effect of pole piece coating. UTILITY MODEL CONTENTS

[0005] In order to solve the problems in the prior art, the utility model provides an intermittent coating valve, the valve core and the pressure compensation assembly move synchronously, the communication volume of the flow channel and the flow channel can be adjusted, and then pressure compensation is carried out during coating to improve the problems of thick head and thin tail in coating.

[0006] The technical effects achieved by the utility model are realized through the following technical aspects:

[0007] The utility model provides an intermittent coating valve, which comprises a valve body, the valve body is provided with a flow channel for slurry flow, and the flow channel has an inlet and an outlet;

[0008] a valve core, the valve core is slidably arranged in the flow channel, and the valve core is used for movably closing the inlet; and

[0009] A pressure compensation assembly is slidingly arranged in the flow channel and abuts against the inner side wall of the flow channel, the pressure compensation assembly is arranged at a distance from the valve core and moves up and down synchronously with the valve core.

[0010] In some implementations, the pressure compensation assembly comprises a valve rod connected to the valve core, and a sliding member arranged on the valve rod and abutting against the inner side wall of the flow channel.

[0011] In some implementations, the valve rod is drivingly connected to a driving member, the driving member drives the valve rod to slide in the flow channel to drive the valve core and the sliding member to move up and down synchronously.

[0012] In some implementations, the valve body is provided with a leakage opening, the leakage opening is in movable communication with the flow channel.

[0013] In some implementations, the sliding member comprises a piston, the piston is sleeved on the valve rod.

[0014] In some implementations, the valve body comprises a main body, the flow channel is located in the main body, and an end cover is detachably connected to the main body, the leakage opening is arranged on the end cover, and the end cover is adapted to the piston.

[0015] In some implementations, the piston is detachably connected to the valve rod.

[0016] In some implementations, the flow channel comprises an inlet section, an outlet section and a buffer section, the pressure compensation assembly is slidingly arranged in the buffer section, and the inlet opening is located between the inlet section and the outlet section.

[0017] In some implementations, the buffer section has a smaller diameter than the outlet section.

[0018] In some implementations, one side of the valve body is provided with a material pipe, the material pipe is in communication with the flow channel of the valve body, and one end of the material pipe is provided with a backflow valve.

[0019] In summary, the utility model has at least the following advantages:

[0020] The intermittent coating valve provided by the utility model, when starting coating, the valve core rapidly rises, the valve core extrudes the slurry flowing in the flow channel to cause the pressure of the slurry to rise, the pressure compensation assembly rises synchronously with the valve core and can generate negative pressure in the flow channel, the pressure compensation assembly can absorb the impact of the slurry in the valve body caused by the rising of the valve core, thereby improving the problem of the thick head of the coating head.

[0021] At the end of coating, the valve core is rapidly lowered, so that the slurry is sucked into the valve body, the pressure is reduced, the pressure compensation assembly is lowered synchronously with the valve core, and the slurry sucked into the valve body can be subjected to positive pressure, so as to absorb the impact of the slurry in the valve body caused by the movement of the valve core again, thereby improving the problem of thin tail of coating.

[0022] The pressure compensation assembly can realize pressure compensation under the condition of adapting to the rapid movement of the valve core, so as to improve the stability of the pressure in the valve body, and the setting of the pressure compensation assembly can obviously improve the thickness difference problem of coating, and improve the uniformity of the pole piece coating. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a partial structure schematic view of the intermittent coating valve of the embodiment of the utility model.

[0024] Figure 2 It is a D-D section view schematic view. Figure 1

[0025] Figure 3 It is a top view of the intermittent coating valve of the embodiment of the utility model.

[0026] Figure 4 It is a C-C section view schematic view. Figure 3

[0027] It is a section view of the end cover and the piston of the embodiment of the utility model. Figure 5

[0028] It is a whole structure schematic view of the intermittent coating valve of the embodiment of the utility model. Figure 6 Markings in the drawing:

[0029] 1, valve body; 11, flow channel; 111, feeding port; 112, discharging port; 113, feeding section; 114, discharging section; 115, buffer section; 12, valve core; 13, leakage port; 14, main body; 15, end cover;

[0030] 2, pressure compensation assembly; 21, valve rod; 22, sliding part; 221, piston; 3, driving part; 4, pipe; 5, backflow valve.

[0031] DETAILED DESCRIPTION In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be described clearly and completely in combination with the drawings in the embodiment of the utility model below. The described embodiment is a part of the embodiments of the utility model, rather than all the embodiments.

[0032] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be described clearly and completely in combination with the drawings in the embodiment of the utility model below. The described embodiment is a part of the embodiments of the utility model, rather than all the embodiments.

[0033] ​Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0034] Embodiment 1:

[0035] Please refer to the accompanying Figure 1 and Figure 2 The intermittent coating valve of the present application can be used in a coating device to coat the surface of a film material, such as a pole piece.

[0036] The intermittent coating valve of the present application comprises a valve body 1, a flow channel 11 for slurry flow is arranged in the valve body 1. Specifically, the flow channel 11 is a vertically arranged channel, and the flow channel 11 has a feed inlet 111 and a discharge outlet 112. The feed inlet 111 is arranged inside the valve body 1, and the discharge outlet 112 is formed on the valve body 1. The slurry can flow from the feed inlet 111 to the discharge outlet 112 in the flow channel 11. Specifically, the main body 14 can be connected to a coating die at the discharge outlet 112, and the slurry flowing in the flow channel 11 is discharged from the discharge outlet 112 into the coating die for pole piece coating.

[0037] The valve body 1 is slidably arranged with a valve core 12 in the flow channel 11 for moving to close the feed inlet 111. The valve core 12 moves up and down along the flow channel 11 to open or close the feed inlet 111 for intermittent feeding during coating.

[0038] The valve body 1 is slidably arranged with a pressure compensation assembly 2 in the flow channel 11. The pressure compensation assembly 2 abuts the inner side wall of the flow channel 11 and is arranged at a distance from the valve core 12. The pressure compensation assembly 2 moves up and down synchronously with the valve core 12. When the valve core 12 opens or closes the valve body 1, the pressure compensation assembly 2 moves up and down synchronously with the valve core 12 in the flow channel 11. The synchronous up-and-down movement of the pressure compensation assembly 2 and the valve core 12 can compensate for the pressure change caused by the movement of the valve core 12.

[0039] When the coating starts, the valve core 12 rapidly rises in the flow channel 11 to supply the coating. The valve core 12 extrudes the slurry flowing in the flow channel 11, the slurry pressure rises, and the slurry is prone to increase the coating amount to cause the coating thickness to be too thick. The pressure compensation assembly 2 rises synchronously with the valve core 12, the pressure compensation assembly 2 increases the flow space of the extruded slurry and generates negative pressure, the pressure compensation assembly 2 absorbs the impact of the slurry in the valve body 1 caused by the action of the valve core 12, and achieves the effect of improving the phenomenon of the coating head being too thick.

[0040] When the coating is finished, the valve core 12 is quickly lowered in the flow channel 11 to finish the supply of the slurry, the valve core 12 sucks the slurry flowing in the flow channel 11, the slurry pressure is reduced, the slurry is prone to have the problem of reduced coating amount at the coating tail to cause the coating thickness to be thin, the pressure compensation assembly 2 is lowered synchronously with the valve core 12, the pressure compensation assembly 2 reduces the flow space of the slurry and generates positive pressure, the pressure compensation assembly 2 absorbs the impact of the slurry in the valve body 1 caused by the action of the valve core 12, and the effect of improving the thin phenomenon at the coating tail is achieved.

[0041] Through the synchronous movement of the valve core 12 and the pressure compensation assembly 2, the pressure compensation assembly 2 can compensate for the rapid change of the pressure in the valve body 1 caused by the rapid movement of the valve core 12 under the condition of ensuring the coating frequency, and the pressure in the valve body 1 is stable. The pressure compensation assembly 2 absorbs the impact energy of the slurry, and the effect of automatically adjusting the coating thickness of the coating head and the coating tail is achieved. The operation of the pressure compensation assembly 2 to compensate for the pressure change is simple, the experience level requirement of the debugging personnel is reduced, and the product consistency is guaranteed.

[0042] Embodiment 2:

[0043] The difference between this embodiment and embodiment 1 is that the pressure compensation assembly 2 and the valve body 1 of the utility model are further optimized in this embodiment, please see Figures 3 to 5 .

[0044] Please see Figure 3 and Figure 4 , the valve body 1 of this embodiment includes a main body 14 and an end cover 15, the main body 14 and the end cover 15 are detachably connected, the end cover 15 is connected with the external environment, in some specific embodiments shown, the end cover 15 and the main body 14 can be connected through a flange to ensure the sealing between the end cover 15 and the main body 14, or a sealing ring or a bolt is used to realize the sealing connection, it can be understood that the person skilled in the related art can replace the end cover 15 according to the actual pressure compensation range of the pressure compensation assembly 2, the end cover 15 is selected to have a corresponding inner diameter to expand or reduce the pressure compensation adjustment range. The pressure compensation assembly 2 reciprocates in the main body 14 and the end cover 15 with the valve core 12 to realize pressure compensation. It can be understood that the end cover 15 and the main body 14 can also be integrally connected, and the present application does not limit this.

[0045] In the preferred embodiments, the flow channel 11 comprises a feeding section 113, a discharging section 114 and a buffer section 115. As shown in some specific embodiments, the feeding section 113 and the discharging section 114 are located in the main body 14, while the buffer section 115 is located in the end cover 15 and the end of the main body 14 close to the end cover 15. The discharging port 112 is located between the feeding section 113 and the discharging section 114, the discharging section 114 communicates with the discharging port 112, and the pressure compensation assembly is slidingly arranged in the buffer section 115. The slurry enters the main body 14 from the feeding section 113, flows out from the discharging section 114 through the discharging port 112, and the valve core 12 can open or close the feeding port 111 to realize intermittent feeding of the valve body 1.

[0046] Specifically, the diameter of the buffer section 115 is smaller than that of the discharging section 114, which can make the space released by the pressure compensation assembly 2 and the valve core 12 synchronously moving upward or downward smaller, so as to synchronously buffer the impact force inside the discharging section 114 when the valve core 12 is opened or closed, thereby buffering the pressure change inside the discharging section 114, and at the same time, avoiding that the diameter of the discharging section 114 is too large, avoiding that too much space is released when the pressure compensation assembly 2 synchronously moves, and keeping the slurry inside the discharging section 114 having a certain kinetic energy, so as to ensure the normal output of the slurry and the normal progress of the coating.

[0047] Please refer to Figure 5 In the preferred embodiments, the end cover 15 is provided with a leakage port 13, which is a circular through hole. The leakage port 13 is in movable communication with the flow channel 11, the end cover 15 communicates with the external environment through the leakage port 13, and when the pressure in the flow channel 11 is too large, the pressure compensation assembly 2 moves upward to the leakage port 13, so that the flow channel 11 communicates with the leakage port 13, thereby realizing the communication between the flow channel 11 and the external environment through the leakage port 13, achieving the pressure relief inside the flow channel 11, and at the same time, part of the slurry can be discharged through the leakage port 13, so as to ensure the stability of the pressure inside the flow channel 11 in time, avoid the situation that the pressure inside the flow channel 11 is too large, and play a protection role. As shown in some specific embodiments, the valve body 1 can be provided with a collection device for the overflowed slurry at the leakage port 13, so as to uniformly collect the leaked slurry.

[0048] Please refer to Figure 4In the preferred embodiment, the pressure compensation assembly 2 comprises a valve rod 21, which is specifically a vertically arranged rod body, the valve core 12 is threaded on the valve rod 21, and the valve rod 21 passes through the discharge section 114, the inlet 111 and the feed section 113 to the outside of the main body 14 in turn. As shown in some specific embodiments, the valve body 1 is drivingly connected with a driving member 3 for driving the valve body 1 to move up and down, and the driving member 3 can be mounted on the main body 14. Specifically, the valve body 1 preferably but not limitedly adopts a pneumatic cylinder, an electric push rod, a linear motor or the like, and the output end of the driving member 3 is drivingly connected with the valve rod 21 to drive the valve rod 21 to move.

[0049] A sliding member 22 is sleeved on the valve rod 21. As shown in some specific embodiments, the sliding member 22 comprises a piston 221, and in other specific embodiments, the sliding member can also be a sliding valve core or the like. The piston 221 is slidingly arranged in the end cover 15 and the main body 14, and the valve rod 21 drives the piston 221 to move up and down synchronously when the valve core 12 moves up and down. Specifically, the piston 221 is detachably connected with the valve rod 21, and the piston 221 can be used in cooperation with the end cover 15. When the end cover 15 is replaced, the corresponding piston 221 of the corresponding diameter can be replaced by the debugging personnel. The piston 221 and the valve rod 21 are preferably but not limitedly assembled by threaded connection. As shown in some specific embodiments, the inlet 111 is located below the piston 221.

[0050] When the coating starts, the driving member 3 drives the valve rod 21 to move up, the valve rod 21 drives the valve core 12 and the piston 221 to move up synchronously, the piston 221 enters the end cover 15 to release a certain space to generate a certain negative pressure on the slurry flowing in the discharge section 114; and when the coating ends, the driving member 3 drives the valve rod 21 to move down, the valve rod 21 drives the valve core 12 and the piston 221 to move down synchronously, and the piston 221 enters the discharge section 114 to generate a certain positive pressure on the slurry flowing in the discharge section 114, so as to synchronously compensate and buffer the pressure change in the discharge section 114. The driving member 3 drives the valve core 12 and the piston 221 to move up and down synchronously through the valve rod 21, so as to realize automatic pressure compensation in the valve body 1, which is convenient to operate.

[0051] Embodiment 3:

[0052] The difference between this embodiment and the above-mentioned embodiments is that, please refer to Figure 6The one side of the valve body 1 is provided with a material pipe 4 for the slurry to flow into the valve body 1, and the material pipe 4 is communicated with the feeding section 113 of the main body 14; the one side of the material pipe 4 away from the valve body 1 is provided with a backflow valve 5, and the backflow valve 5 can reduce the damage of the pressure compensation device caused by the backflow of the slurry; the backflow valve 5 reduces the backflow of the slurry in a manner known to those skilled in the art and can be realized, and the specific implementation is not described in the embodiment. In some specific embodiments as shown, the above-mentioned pressure compensation assembly 2 can be arranged in the backflow valve 5, that is, the valve rod 21 is connected with the valve core 12 of the backflow valve 5, and the valve rod 21 drives the valve core 12 of the backflow valve 5 to synchronously ascend and descend with the piston 221, so as to realize the automatic compensation of the slurry pressure in the backflow valve 5.

[0053] The pressure compensation device provided by the utility model can keep good synchronism of the valve core 12 and the pressure compensation assembly 2 in long-time instantaneous action, so as to ensure good pressure compensation effect and coating effect, the coating thickness is uniform in the coating process of the pole piece, and the influence of the coating speed on the uniformity of the coating thickness can be reduced.

[0054] In the utility model, unless there is definite stipulation and limitation, the terms "mount", "connect", "joint", "fix" and the like should be understood in a broad sense, for example, it can be fixed connection, can also be detachable connection, or be integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0055] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawing, or the orientation or position relationship of the utility model product when it is usually placed, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0056] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0057] In the utility model, unless another definite provision and limitation, first feature is above or below second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.

[0058] Although the description of the utility model is combined with above specific embodiment, it is obvious that many substitutions, modifications and changes can be made according to the above-mentioned content by the person skilled in the art. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. An intermittent coating valve, characterized by, include: A valve body (1), the valve body (1) is provided with a flow channel (11) for slurry circulation, the flow channel (11) having an inlet (111) and an outlet (112); a valve core (12), the valve core (12) being slidably disposed in the flow channel (11), the valve core (12) being used to movably close the feed port (111); and A pressure compensation component (2) is slidably arranged in the flow channel (11) and abuts against the inner wall of the flow channel (11). The pressure compensation component (2) and the valve core (12) are spaced apart from each other and move up and down synchronously with the valve core (12).

2. The intermittent coating valve of claim 1, wherein, The pressure compensation component (2) comprises: a valve stem (21), connected to the valve core (12); and A sliding member (22) is provided on the valve stem (21), and the sliding member (22) abuts against the inner wall of the flow channel (11).

3. The intermittent coating valve of claim 2, wherein, The valve stem (21) is connected to a driving member (3) in a transmission manner. The driving member (3) drives the valve stem (21) to slide in the flow channel (11) to drive the valve core (12) and the sliding member (22) to move up and down synchronously.

4. The intermittent coating valve of claim 2, wherein, The valve body (1) is provided with a leakage port (13), and the leakage port (13) is movably connected to the flow channel (11).

5. The intermittent coating valve of claim 4, wherein, The sliding member (22) comprises a piston (221), and the piston (221) is sleeved on the valve stem (21).

6. The intermittent coating valve of claim 5, wherein, The valve body (1) comprises: a main body (14), wherein the flow channel (11) is located in the main body (14); and The end cover (15) is detachably connected to the main body (14), the leakage port (13) is opened on the end cover (15), and the end cover (15) is adapted to the piston (221).

7. The intermittent coating valve of claim 5, wherein, The piston (221) is detachably connected to the valve stem (21).

8. The intermittent coating valve of claim 5, wherein, The flow channel (11) comprises a feed section (113), a discharge section (114) and a buffer section (115); the pressure compensation component (2) is slidably arranged in the buffer section (115); and the feed port (111) is located between the feed section (113) and the discharge section (114).

9. The intermittent coating valve of claim 8, wherein, The caliber of the buffer section (115) is smaller than the caliber of the discharge section (114).

10. The intermittent coating valve of claim 1, wherein, A material pipe (4) is provided on one side of the valve body (1), the material pipe (4) is connected to the flow channel (11) of the valve body (1), and a reflux valve (5) is provided at one end of the material pipe (4).

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