Coating liquid supply system and coating apparatus

Abstract

The utility model discloses a kind of coating liquid supply system and coating device, supply system includes first pump chamber, second pump chamber, transmission module, liquid supplement device and for with the liquid supply end of connecting coating device;First pump chamber, transmission module and second pump chamber are sequentially connected, and transmission module is used to reciprocate between first pump chamber and second pump chamber and extrude first pump chamber or second pump chamber;First pump chamber includes first liquid inlet and first liquid outlet, second pump chamber includes second liquid inlet and second liquid outlet, first liquid inlet and second liquid inlet are respectively connected liquid supplement device, first liquid outlet and second liquid outlet are respectively connected liquid supply end;When transmission module moves and extrudes first pump chamber, liquid supply end is communicated with first liquid outlet, liquid supplement device is communicated with second liquid inlet;When transmission module moves and extrudes second pump chamber, liquid supply end is communicated with second liquid outlet, liquid supplement device is communicated with first liquid inlet.The utility model can realize to provide stable and continuous coating liquid supply to liquid supply end.

Description

Technical Field

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

[0002] Slit coating technology is widely used in the manufacturing of high-tech products such as perovskite solar cells, flat panel displays, chip packaging, and lithium-ion batteries. In recent years, perovskite solar cells have developed rapidly, with increasingly higher conversion efficiencies. MW-level (megawatt-level) and GW-level (gigawatt-level) production lines place even higher demands on coating efficiency.

[0003] Precision pumps, as core components of slot coating systems, play a crucial role in the quality and efficiency of film formation. Existing pumps suffer from large flow rate fluctuations, making stable flow control impossible. This results in poor film thickness uniformity after formation, affecting film quality and ultimately conversion efficiency. While current supply pumps in coating systems may meet requirements, they require replenishment after reaching a certain volume. Coating cannot proceed during this replenishment period, especially for high-viscosity materials, where the replenishment time is even longer. The coating equipment must wait for the pump to replenish before resuming coating, impacting production cycle time and efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a coating liquid supply system and a coating device to solve the problems in the prior art where the supply pump in the coating system needs to be replenished after the liquid output reaches a certain amount, which causes the coating equipment to be temporarily unable to perform coating, affecting the production cycle and efficiency.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model provides a coating liquid supply system, including a first pump chamber, a second pump chamber, a transmission module, a liquid replenishment device, and a liquid supply end for connection with a coating device; the first pump chamber, the transmission module, and the second pump chamber are connected in sequence, and the transmission module is used to reciprocate between the first pump chamber and the second pump chamber, and to squeeze the first pump chamber or the second pump chamber accordingly; the first pump chamber includes a first liquid inlet and a first liquid outlet, the second pump chamber includes a second liquid inlet and a second liquid outlet, the first liquid inlet and the second liquid inlet are respectively connected to the liquid replenishment device, and the first liquid outlet and the second liquid outlet are respectively connected to the liquid supply end;

[0007] When the transmission module moves and squeezes the first pump chamber, the liquid supply end is connected to the first liquid outlet, and the liquid replenishment device is connected to the second liquid inlet; when the transmission module moves and squeezes the second pump chamber, the liquid supply end is connected to the second liquid outlet, and the liquid replenishment device is connected to the first liquid inlet.

[0008] The beneficial effects of the above solution are as follows: when the control transmission module squeezes the first pump chamber, the first pump chamber discharges liquid, and at the same time, the second pump chamber is replenished with liquid; when the control transmission module squeezes the second pump chamber, the second pump chamber discharges liquid, and at the same time, the first pump chamber is replenished with liquid. This can realize a high-precision continuous liquid supply pump system, providing a stable and continuous supply of coating liquid to the liquid supply end, thereby improving production efficiency.

[0009] As a further improvement of one embodiment of the present invention, the first pump chamber includes a first indirect liquid chamber, a first coating liquid chamber, and a first diaphragm. The first diaphragm is used to separate the first indirect liquid chamber and the first coating liquid chamber, and the first inlet and the first outlet are both connected to the first coating liquid chamber. The transmission module is used to move and squeeze the first indirect liquid chamber, so that the first diaphragm deforms toward the first coating liquid chamber, so that the coating liquid in the first coating liquid chamber is squeezed out from the first outlet.

[0010] The second pump chamber includes a second indirect liquid chamber, a second coating liquid chamber, and a second diaphragm. The second diaphragm is used to separate the second indirect liquid chamber and the second coating liquid chamber. The second inlet and the second outlet are both connected to the second coating liquid chamber. The transmission module is used to move and squeeze the second indirect liquid chamber, causing the second diaphragm to deform toward the second coating liquid chamber, so that the coating liquid in the second coating liquid chamber is squeezed and flows out from the second outlet.

[0011] As a further improvement of one embodiment of the present invention, the transmission module includes a drive module and an extrusion module connected in sequence, wherein the drive module is used to drive the extrusion module to reciprocate between the first pump chamber and the second pump chamber.

[0012] As a further improvement of one embodiment of the present invention, the drive module includes a connected motor and a coupling. The drive module is connected to the extrusion module through a connecting module. The connecting module includes a screw thread and a transmission mechanism disposed on the screw thread. The screw thread is connected to the coupling. The extrusion module is a plunger fixed to the transmission mechanism.

[0013] The motor is used to drive the screw to rotate, so that the transmission mechanism drives the plunger to move.

[0014] The beneficial effect of the above scheme is that by using a motor to smoothly drive the plunger to reciprocate, the coating liquid can be smoothly output to the supply end when the plunger squeezes the indirect liquid in the first or second indirect liquid chamber, thus avoiding uneven coating thickness.

[0015] As a further improvement of one embodiment of the present invention, the connecting module further includes a fixing block that is threadedly connected to the screw, one end of the transmission mechanism is fixedly connected to the fixing block, and the other end is fixedly connected to the plunger.

[0016] As a further improvement of one embodiment of the present invention, the transmission module further includes a sensing module and a control module. The sensing module includes at least a first sensing module and a second sensing module. The first sensing module and the second sensing module are disposed on the moving path of the transmission mechanism, with the first sensing module close to the first pump chamber and the second sensing module close to the second pump chamber. The first sensing module and the second sensing module are respectively connected to the control module. The control module is used to acquire change information of the first sensing module when the transmission mechanism moves closer to the first sensing module, and to acquire change information of the second sensing module when the transmission mechanism moves closer to the second sensing module.

[0017] The control module is also connected to the drive module and is used to control the motor to rotate forward or reverse according to the change information of the first sensing module or the second sensing module, so as to change the movement direction of the transmission mechanism and the plunger.

[0018] As a further improvement of one embodiment of the present invention, the coating liquid supply system further includes a first channel switching device and a second channel switching device. The first channel switching device includes a first common port, a first valve, and a second valve. The first common port is connected to the liquid replenishment device, the first valve is connected to the first liquid inlet, and the second valve is connected to the second liquid inlet. The second channel switching device includes a second common port, a third valve, and a fourth valve. The second common port is connected to the liquid supply end, the third valve is connected to the first liquid outlet, and the fourth valve is connected to the second liquid outlet.

[0019] The control module is also connected to the first path switching device and the second path switching device, and is further configured to, when acquiring change information from the first sensing module, control the plunger to move towards the second pump chamber, and simultaneously control the first valve and the first common port to be connected, as well as the fourth valve and the second common port to be connected; when acquiring change information from the second sensing module, control the plunger to move towards the first pump chamber, and simultaneously control the second valve and the first common port to be connected, as well as the third valve and the second common port to be connected.

[0020] The beneficial effects of the above solution are as follows: When the control module obtains the change information from the first and second sensing modules, it controls the change in the movement direction of the plunger, and simultaneously controls the valve switching of the first and second channel switching devices. This achieves automatic switching between "liquid discharge from the first pump chamber and liquid replenishment from the second pump chamber" and "liquid replenishment from the first pump chamber and liquid discharge from the second pump chamber," thereby realizing a high-precision continuous liquid supply pump system that provides a stable and continuous supply of coating liquid to the supply end, improving production efficiency.

[0021] As a further improvement of one embodiment of the present invention, the coating liquid supply system further includes a first control valve and a second control valve. The first control valve is disposed between the liquid replenishment device and the first channel switching device, and the second control valve is disposed between the liquid supply end and the second channel switching device.

[0022] The first control valve and the second control valve are used to regulate the flow rate of the coating liquid.

[0023] As a further improvement of one embodiment of the present invention, both the first channel switching device and the second channel switching device are rotary directional valves.

[0024] And / or, both the first control valve and the second control valve are pneumatically controlled liquid valves.

[0025] This invention also provides a coating apparatus, including the coating liquid supply system described above.

[0026] Compared with the prior art, the beneficial effects of this utility model include at least the following: This utility model provides a coating liquid supply system, which is provided with a first pump chamber and a second pump chamber. A transmission module reciprocates between the first pump chamber and the second pump chamber to squeeze the first pump chamber or the second pump chamber. When the transmission module moves to squeeze the first pump chamber, the liquid supply end is connected to the first liquid outlet and the liquid replenishment device is connected to the second liquid inlet. When the transmission module moves to squeeze the second pump chamber, the liquid supply end is connected to the second liquid outlet and the liquid replenishment device is connected to the first liquid inlet. In this way, when the transmission module squeezes the first pump chamber, the first pump chamber discharges liquid, and at the same time, the second pump chamber is replenished with liquid. When the transmission module squeezes the second pump chamber, the second pump chamber discharges liquid, and at the same time, the first pump chamber is replenished with liquid. This achieves a high-precision continuous liquid supply pump system, providing a stable and continuous supply of coating liquid to the liquid supply end, thereby improving production efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a coating liquid supply system according to one embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a first pump chamber or a second pump chamber according to one embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the connection structure between the first pump chamber, the transmission module, and the second pump chamber in one embodiment of this utility model (piston movement compresses the first pump chamber);

[0030] Figure 4 This is a schematic diagram of the connection structure between the first pump chamber, the transmission module, and the second pump chamber in one embodiment of this utility model (piston movement compresses the second pump chamber).

[0031] In the diagram: 1. First pump chamber; 11. First inlet; 12. First outlet; 13. First indirect liquid chamber; 14. First coating liquid chamber; 15. First diaphragm; 16. First cap; 2. Second pump chamber; 21. Second inlet; 22. Second outlet; 23. Second indirect liquid chamber; 24. Second coating liquid chamber; 25. Second diaphragm; 26. Second cap; 3. Transmission module; 31. Drive module; 311. Motor; 312. Coupling; 32. Extrusion module (plunger); 33. Connecting... Module 331; Lead screw; 332; Transmission mechanism; 333; Fixing block; 34; Sensing module; 341; First sensing module; 342; Second sensing module; 343; Third sensing module; 4; Liquid replenishment device; 5; Liquid supply end; 6; First path switching device; 61; First common port; 62; First valve; 63; Second valve; 7; Second path switching device; 71; Second common port; 72; Third valve; 73; Fourth valve; 8; First control valve; 9; Second control valve. Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0033] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0034] See also Figures 1 to 4 This utility model provides a coating liquid supply system, including a first pump chamber 1, a second pump chamber 2, a transmission module 3, a liquid replenishment device 4, and a liquid supply end 5 for connection with a coating device. The first pump chamber 1, the transmission module 3, and the second pump chamber 2 are connected in sequence, and the transmission module 3 is used to reciprocate between the first pump chamber 1 and the second pump chamber 2, and squeeze the first pump chamber 1 or the second pump chamber 2 accordingly.

[0035] The first pump chamber 1 includes a first inlet 11 and a first outlet 12, and the second pump chamber 2 includes a second inlet 21 and a second outlet 22. The first inlet 11 and the second inlet 21 are respectively connected to the replenishing device 4, and the first outlet 12 and the second outlet 22 are respectively connected to the supply end 5. Here, the supply end 5 can be connected to the coating head in the coating device to supply coating liquid to the coating head.

[0036] When the transmission module 3 moves toward the interior of the first pump chamber 1 and squeezes the first pump chamber 1, the liquid supply end 5 is connected to the first liquid outlet 12, and the liquid replenishment device 4 is connected to the second liquid inlet 21. When the transmission module 3 moves toward the interior of the second pump chamber 2 and squeezes the second pump chamber 2, the liquid supply end 5 is connected to the second liquid outlet 22, and the liquid replenishment device 4 is connected to the first liquid inlet 11. That is, when the transmission module 3 moves and squeezes the first pump chamber 1, the first liquid inlet 11 is closed, the first liquid outlet 12 is open, and the coating liquid in the first pump chamber 1 flows out from the first liquid outlet 12 to the liquid supply end 5 due to the squeezing, providing coating liquid to the coating device. At this time, the second pump chamber 2 is not squeezed, its second liquid inlet 21 is open, its second liquid outlet 22 is closed, and the liquid replenishment device 4 is connected to the second liquid inlet 21 to replenish the coating liquid in the second pump chamber 2, ensuring that there is enough coating liquid stored in the second pump chamber 2. When the transmission module 3 moves and squeezes the second pump chamber 2, the second inlet 21 is closed and the second outlet 22 is open. The coating liquid in the second pump chamber 2 is squeezed out from the second outlet 22 to the supply end 5, which continues to supply coating liquid to the coating device. At this time, the first pump chamber 1 is not squeezed, its first inlet 11 is open and its first outlet 12 is closed. The replenishment device 4 is connected to the first inlet 11 and replenishes the coating liquid in the first pump chamber 1 to ensure that there is enough coating liquid stored in the first pump chamber 1.

[0037] In this way, by using the transmission module 3 to reciprocate between the first pump chamber 1 and the second pump chamber 2 and squeeze the first pump chamber 1 or the second pump chamber 2, and controlling the transmission module 3 to squeeze the first pump chamber 1 so that the first pump chamber 1 discharges liquid and the second pump chamber 2 is replenished with liquid at the same time, and controlling the transmission module 3 to squeeze the second pump chamber 2 so that the second pump chamber 2 discharges liquid and the first pump chamber 1 is replenished with liquid at the same time, a high-precision continuous liquid supply pump system can be realized, which provides a stable and continuous supply of coating liquid to the liquid supply end 5, avoiding the situation of wasting time by waiting for one of the pump chambers to replenish liquid, and improving production efficiency.

[0038] See Figure 2The first pump chamber 1 includes a first indirect liquid chamber 13, a first coating liquid chamber 14, and a first diaphragm 15. The first diaphragm 15 separates the first indirect liquid chamber 13 and the first coating liquid chamber 14, and both the first inlet 11 and the first outlet 12 are connected to the first coating liquid chamber 14. The transmission module 3 is used to move and compress the first indirect liquid chamber 13, causing the first diaphragm 15 to deform toward the first coating liquid chamber 14, so that the coating liquid in the first coating liquid chamber 14 is squeezed and flows out from the first outlet 12.

[0039] Of course, the first pump chamber 1 also includes a first cover 16, which is connected to the first coating liquid chamber 14 and is used to seal the first coating liquid chamber 14. The first inlet 11 and the first outlet 12 are disposed on the first cover 16 and communicate with the first coating liquid chamber 14.

[0040] The second pump chamber 2 includes a second indirect liquid chamber 23, a second coating liquid chamber 24, and a second diaphragm 25. The second diaphragm 25 separates the second indirect liquid chamber 23 and the second coating liquid chamber 24, and both the second inlet 21 and the second outlet 22 are connected to the second coating liquid chamber 24. The transmission module 3 is used to move and compress the second indirect liquid chamber 23, causing the second diaphragm 25 to deform toward the second coating liquid chamber 24, so that the coating liquid in the second coating liquid chamber 24 is squeezed and flows out from the second outlet 22.

[0041] Of course, the second pump chamber 2 also includes a second cover 26, which is connected to the second coating liquid chamber 24 and is used to seal the second coating liquid chamber 24. The second inlet 21 and the second outlet 22 are disposed on the second cover 26 and communicate with the second coating liquid chamber 24.

[0042] The structure and dimensions of the first pump chamber 1 and the second pump chamber 2 can be set to be the same or different.

[0043] The first indirect liquid chamber 13 and the second indirect liquid chamber 23 are used to store indirect liquid, and the first coating liquid chamber 14 and the second coating liquid chamber 24 are used to store coating liquid. When the transmission module 3 moves and squeezes the first pump chamber 1, since the first outlet 12 is in a state of communication with the supply end 5, the indirect liquid in the first indirect liquid chamber 13 is squeezed and pushes the first diaphragm 15 toward the first coating liquid chamber 14, thereby pressurizing the coating liquid in the first coating liquid chamber 14 and delivering it to the supply end 5. When the transmission module 3 moves and squeezes the second pump chamber 2, since the second outlet 22 is in a state of communication with the supply end 5, the indirect liquid in the second indirect liquid chamber 13 is squeezed and pushes the second diaphragm 25 toward the second coating liquid chamber 24, thereby pressurizing the coating liquid in the second coating liquid chamber 24 and delivering it to the supply end 5. At this time, the first diaphragm 15 is reset, the first inlet 11 is connected to the replenishment device 4, and the first coating liquid chamber 14 is replenished with new coating liquid. When the transmission module 3 moves again to squeeze the first pump chamber 1, the first diaphragm 15 is deformed by pressure, and liquid is discharged from the first pump chamber 1. At this time, the second diaphragm 25 returns to its original position, and the second liquid inlet 21 connects with the liquid replenishment device 4, allowing the second coating liquid chamber 24 to be replenished with new coating liquid. In this way, by using the reciprocating motion of the transmission module 3 between the first pump chamber 1 and the second pump chamber 2, when the first pump chamber 1 is squeezed to discharge liquid, the second pump chamber 2 is replenished with liquid, and when the second pump chamber 2 is squeezed to discharge liquid, the first pump chamber 1 is replenished with liquid, thus forming a continuous coating liquid supply system.

[0044] See Figure 3 and Figure 4 The transmission module 3 includes a drive module 31 and an extrusion module 32 connected in sequence. The two ends of the extrusion module 32 are respectively connected to the first pump chamber 1 and the second pump chamber 2. The drive module 31 is used to drive the extrusion module 32 to reciprocate between the first pump chamber 1 and the second pump chamber 2.

[0045] The drive module 31 includes a connected motor 311 and a coupling 312. The drive module 31 is connected to the extrusion module 32 through a connection module 33. The connection module 33 includes a screw 331 and a transmission mechanism 332 disposed on the screw 331. The screw 331 is connected to the coupling 312. The extrusion module 32 is a plunger 32 fixed to the transmission mechanism 332.

[0046] Specifically, the extension direction of the screw 331 is parallel to the connection direction of the center point of the first pump chamber 1 and the second pump chamber 2, the extension direction of the transmission mechanism 332 is perpendicular to the extension direction of the screw 331, and the extension direction of the plunger 32 is parallel to the extension direction of the screw 331.

[0047] More specifically, the motor 311 drives the screw 331 to rotate, so that the transmission mechanism 332 drives the plunger 32 (extrusion module 32) to move. That is, the motor 311 drives the screw 331 to rotate, so that the transmission mechanism 332 drives the plunger 32 to move along the extension direction of the screw 331, that is, the plunger 32 moves in the direction connecting the center points of the first pump chamber 1 and the second pump chamber 2. For example, when the motor 311 rotates forward, it drives the screw 331 to rotate forward to drive the transmission mechanism 332 and the plunger 32 to move towards the first pump chamber 1; when the motor 311 rotates in reverse, it drives the screw 331 to rotate in reverse to drive the transmission mechanism 332 and the plunger 32 to move towards the second pump chamber 2. Of course, in another embodiment, when the motor 311 rotates forward, it drives the screw 331 to rotate forward so as to drive the transmission mechanism 332 and the plunger 32 to move towards the direction of the second pump chamber 2; when the motor 311 rotates in reverse, it drives the screw 331 to rotate in reverse so as to drive the transmission mechanism 332 and the plunger 32 to move towards the direction of the first pump chamber 1.

[0048] The two ends of the plunger 32 are respectively connected to the first indirect liquid chamber 13 of the first pump chamber 1 and the second indirect liquid chamber 23 of the second pump chamber 2, so that when the plunger 32 is driven to move toward the first pump chamber 1, it squeezes the indirect liquid in the first indirect liquid chamber 13, causing the first diaphragm 15 to deform toward the first coating liquid chamber 14, such as... Figure 3 When the plunger 32 is driven to move toward the second pump chamber 2, it squeezes the indirect liquid in the second indirect liquid chamber 23, causing the second diaphragm 25 to deform toward the second coating liquid chamber 24, such as... Figure 4 .

[0049] Furthermore, the connecting module 33 also includes a fixing block 333 threadedly connected to the screw 331. One end of the transmission mechanism 332 is fixedly connected to the fixing block 333, and the other end is fixedly connected to the plunger 32 (extrusion module 32). That is, when the motor 311 drives the screw 331 to rotate, the fixing block 333 moves along the extension direction of the screw 331 and on the screw 331, so as to drive the transmission mechanism 332 and the plunger 32 (extrusion module 32) to move synchronously.

[0050] It should be noted that this invention does not limit the length of the plunger 32. By reasonably setting the length of the plunger 32, the pressure exerted by the plunger 32 on the second indirect liquid chamber 23 of the second pump chamber 2 gradually decreases as the plunger 32 moves toward the first pump chamber 1 and begins to squeeze the indirect liquid in the first indirect liquid chamber 13. Furthermore, when the plunger 32 moves to the maximum extent of squeezing the indirect liquid in the first indirect liquid chamber 13, the plunger 32 exerts no force on the second indirect liquid chamber 23; that is, the plunger 32 completely moves out of the second indirect liquid chamber 23, the first diaphragm 15 undergoes maximum deformation, and the second diaphragm 25 returns to its original position. Figure 3 When the plunger 32 moves from the first pump chamber 1 towards the second pump chamber 2, and begins to squeeze the indirect liquid in the second indirect liquid chamber 23, the pressure of the plunger 32 on the first indirect liquid chamber 13 of the first pump chamber 1 gradually decreases. When the plunger 32 reaches its maximum squeezing point on the indirect liquid in the second indirect liquid chamber 23, the plunger 32 exerts no force on the first indirect liquid chamber 13; that is, the plunger 32 completely moves out of the first indirect liquid chamber 13, the second diaphragm 25 undergoes maximum deformation, and the first diaphragm 15 returns to its original position. Figure 4 In other words, by reasonably setting the length of the plunger 32, when the plunger 32 reciprocates between the first pump chamber 1 and the second pump chamber 2, it can ensure that either the first indirect liquid chamber 13 is in a compressed state and the first pump chamber 1 discharges liquid, or the second indirect liquid chamber 23 is in a compressed state and the second pump chamber 2 discharges liquid, thus forming a continuous and uninterrupted liquid discharge state.

[0051] See also Figure 3 and Figure 4 The transmission module 3 also includes a sensing module 34 and a control module. The sensing module 34 includes at least a first sensing module 341 and a second sensing module 342. The first sensing module 341 and the second sensing module 342 are disposed on the moving path of the transmission mechanism 332, with the first sensing module 341 close to the first pump chamber 1 and the second sensing module 342 close to the second pump chamber 2. The first sensing module 341 and the second sensing module 342 are respectively connected to the control module. The first sensing module 341 and the second sensing module 342 output change information when the transmission mechanism 332 moves closer to the first sensing module 341. The control module is used to acquire the change information of the first sensing module 341 when the transmission mechanism 332 moves closer to the first sensing module 341, and to acquire the change information of the second sensing module 342 when the transmission mechanism 332 moves closer to the second sensing module 342. Specifically, the first sensing module 341 and the second sensing module 342 output change information when the transmission mechanism 332 moves to be directly below it. The control module is used to acquire the change information of the first sensing module 341 when the transmission mechanism 332 moves to be directly below the first sensing module 341, and to acquire the change information of the second sensing module 342 when the transmission mechanism 332 moves to be directly below the second sensing module 342.

[0052] The control module is also connected to the drive module 31 and is used to control the motor 311 to rotate forward or reverse according to the change information of the first sensor module 341 or the second sensor module 342, so as to change the movement direction of the transmission mechanism 332 and the plunger 32. When the motor 311 rotates forward and continuously drives the screw 331 to rotate, it drives the transmission mechanism 332 and the plunger 32 to move towards the first pump chamber 1. At this time, the first liquid outlet 12 is connected to the liquid supply end 5, and the second liquid inlet 21 is connected to the liquid replenishment device 4. As the plunger 32 moves, it gradually squeezes the first indirect liquid chamber 13, and the coating liquid in the first coating liquid chamber 14 is gradually output from the first liquid outlet 12 to the liquid supply end 5. As the plunger 32 gradually moves away from the second pump chamber 2, the squeezing pressure on the second indirect liquid chamber 23 gradually decreases, the second diaphragm 25 gradually resets, and the second coating liquid chamber 24 begins to replenish the coating liquid. When the transmission mechanism 332 moves to a position directly below the first sensing module 341, the first sensing module 341 outputs change information. The control module obtains the change information from the first sensing module 341 and controls the motor 311 to start reversing, changing the moving direction of the transmission mechanism 332 and the plunger 32. The plunger 32 is controlled to start moving towards the direction closer to the second pump chamber 2. At this time, the deformation of the first diaphragm 15 reaches its maximum. At the same time, the second liquid outlet 22 is switched to connect to the liquid supply end 5, and the first liquid inlet 11 is switched to connect to the liquid replenishment device 4. As the plunger 32 gradually moves towards the direction closer to the second pump chamber 2, the movement of the plunger 32 gradually squeezes the second indirect liquid chamber 23. The coating liquid in the second coating liquid chamber 24 is gradually output from the second liquid outlet 22 to the liquid supply end 5. As the plunger 32 gradually moves away from the first pump chamber 1, the squeezing force on the first indirect liquid chamber 13 gradually decreases, the first diaphragm 15 gradually resets, and the first coating liquid chamber 14 begins to replenish the coating liquid. When the control module controls the motor 311 to reverse and continuously drive the screw 331 to rotate, causing the transmission mechanism 332 and the plunger 32 to move towards the second pump chamber 2, and when the transmission mechanism 332 is located directly below the second sensing module 342, the second sensing module 342 outputs change information. The control module obtains the change information from the second sensing module 342 and controls the motor 311 to start rotating forward. At this time, the deformation of the second diaphragm 25 reaches its maximum. At the same time, the first liquid outlet 11 is switched to connect to the liquid supply end 5, and the second liquid inlet 21 is switched to connect to the liquid replenishment device 4. In this way, the plunger 32 can be controlled to reciprocate between the first pump chamber 1 and the second pump chamber 2, so that when the liquid discharge from the first pump chamber 1 is completed, the control of the second pump chamber 2 is immediately switched to continue discharging liquid, and the first pump chamber 1 is replenished; when the liquid discharge from the second pump chamber 2 is completed, the control of the first pump chamber 1 is immediately switched to continue discharging liquid, and the second pump chamber 2 is replenished. At the same time, the motor 311 smoothly drives the plunger 32 to reciprocate, so that when the plunger 32 squeezes the indirect liquid in the first indirect liquid chamber 13 or the second indirect liquid chamber 23, the coating liquid can be smoothly output to the supply end 5, avoiding uneven coating thickness.

[0053] Of course, the sensing module 34 may also include a third sensing module 343. The third sensing module 343 is disposed between the first sensing module 341 and the second sensing module 342. The third sensing module 343 is connected to the control module. The third sensing module 343 outputs change information when the transmission mechanism 332 moves closer. The control module is also used to acquire the change information of the third sensing module 343 when the transmission mechanism 332 moves past the third sensing module 343.

[0054] In one embodiment, the sensing module 34 (including the first sensing module 341, the second sensing module 342 and the third sensing module 343) can be an optical sensor, which determines whether the transmission mechanism 332 moves close to or passes through the sensing module 34 by the changes in light emission and reception.

[0055] In other embodiments, the sensing module 34 may also be an ultrasonic sensor, which determines whether the transmission mechanism 332 moves close to or passes through the sensing module 34 by emitting ultrasonic waves and receiving reflected waves.

[0056] Furthermore, see again Figure 1 The coating liquid supply system also includes a first path switching device 6 and a second path switching device 7. The first path switching device 6 is located on the path for replenishing the coating liquid, and the second path switching device 7 is located on the path for outputting the coating liquid. The first path switching device 6 includes a first common port 61, a first valve 62, and a second valve 63. The first common port 61 is connected to the replenishing device 4, the first valve 62 is connected to the first inlet 11, and the second valve 63 is connected to the second inlet 21. The second path switching device 7 includes a second common port 71, a third valve 72, and a fourth valve 73. The second common port 71 is connected to the supply end 5, the third valve 72 is connected to the first outlet 12, and the fourth valve 73 is connected to the second outlet 22.

[0057] The control module is also connected to the first path switching device 6 and the second path switching device 7, and is also used to control the switching of the first common port 61 and the first valve 62 or the second valve 63, and to control the switching of the second common port 71 and the third valve 72 or the fourth valve 73.

[0058] Specifically, when the control module acquires change information from the first sensor module 341, it controls the plunger 32 to move closer to the second pump chamber 2, and simultaneously controls the first valve 62 and the first common port 61 to be open, as well as the fourth valve 73 and the second common port 71 to be open. That is, when the control module acquires change information from the first sensor module 341, it switches the first valve 62 and the first common port 61 to be open, connecting the first inlet 11 to the replenishment device 4; it switches the fourth valve 73 and the second common port 71 to be open, connecting the second outlet 22 to the supply end 5. The control module is also used when it acquires change information from the second sensor module 342, to control the plunger 32 to move closer to the first pump chamber 1, and simultaneously controls the second valve 63 and the first common port 61 to be open, as well as the third valve 72 and the second common port 71 to be open. That is, when the control module obtains the change information of the second sensing module 342, it switches the second valve 63 and the first common port 61 to conduct, so that the second liquid inlet 21 is connected to the liquid replenishment device 4; it switches the third valve 72 and the second common port 71 to conduct, so that the first liquid outlet 12 is connected to the liquid supply end 5.

[0059] Preferably, both the first channel switching device 6 and the second channel switching device 7 are rotary directional valves, which have a small liquid impact on the replenished coating liquid or the output coating liquid during the valve switching process, thus achieving stable liquid replenishment and dispensing.

[0060] Furthermore, the coating liquid supply system also includes a first control valve 8 and a second control valve 9. The first control valve 8 is located between the liquid replenishment device 4 and the first channel switching device 6, and the second control valve 9 is located between the liquid supply end 5 and the second channel switching device 7. The first control valve 8 and the second control valve 9 are used to regulate the flow rate of the coating liquid. Specifically, the opening degree of the first control valve 8 and the second control valve 9 can be adjusted. By adjusting the opening degree of the first control valve 8 and the second control valve 9, the opening size of the first control valve 8 and the second control valve 9 can be adjusted, thereby realizing the regulation of the flow rate of the coating liquid.

[0061] The first control valve 8 is used to control the flow rate of the coating liquid supplied by the replenishing device 4 to the first coating liquid chamber 14 or the second coating liquid chamber 24, and to prevent backflow of the liquid. The second control valve 9 is used to control the flow rate of the coating liquid output from the first coating liquid chamber 14 or the second coating liquid chamber 24 to the supply end 5, and to prevent backflow of the liquid.

[0062] Preferably, both the first control valve 8 and the second control valve 9 are pneumatically controlled liquid valves.

[0063] This utility model also provides a coating device, including the coating liquid supply system described in any of the above embodiments.

[0064] In summary, this utility model provides a coating liquid supply system, comprising a first pump chamber and a second pump chamber. A transmission module reciprocates between the first and second pump chambers to compress either the first or second pump chamber. When the transmission module compresses the first pump chamber, the supply end is connected to the first outlet, and the replenishment device is connected to the second inlet. When the transmission module compresses the second pump chamber, the supply end is connected to the second outlet, and the replenishment device is connected to the first inlet. Thus, by controlling the transmission module to compress the first pump chamber, liquid is discharged from the first pump chamber while replenishing the second pump chamber; and by controlling the transmission module to compress the second pump chamber, liquid is discharged from the second pump chamber while replenishing the first pump chamber, a high-precision continuous liquid supply pump system is achieved, providing a stable and continuous supply of coating liquid to the supply end and improving production efficiency.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A coating liquid supply system characterized by comprising: It includes a first pump chamber, a second pump chamber, a transmission module, a liquid replenishment device, and a liquid supply end for connection with a coating device; the first pump chamber, the transmission module, and the second pump chamber are connected in sequence, and the transmission module is used to reciprocate between the first pump chamber and the second pump chamber, and to squeeze the first pump chamber or the second pump chamber accordingly; the first pump chamber includes a first liquid inlet and a first liquid outlet, the second pump chamber includes a second liquid inlet and a second liquid outlet, the first liquid inlet and the second liquid inlet are respectively connected to the liquid replenishment device, and the first liquid outlet and the second liquid outlet are respectively connected to the liquid supply end; When the transmission module moves and squeezes the first pump chamber, the liquid supply end is connected to the first liquid outlet, and the liquid replenishment device is connected to the second liquid inlet; when the transmission module moves and squeezes the second pump chamber, the liquid supply end is connected to the second liquid outlet, and the liquid replenishment device is connected to the first liquid inlet.

2. The coating liquid supply system according to claim 1, wherein The first pump chamber includes a first indirect liquid chamber, a first coating liquid chamber, and a first diaphragm. The first diaphragm is used to separate the first indirect liquid chamber and the first coating liquid chamber, and the first inlet and the first outlet are both connected to the first coating liquid chamber. The transmission module is used to move and squeeze the first indirect liquid chamber, so that the first diaphragm deforms toward the first coating liquid chamber, so that the coating liquid in the first coating liquid chamber is squeezed out from the first outlet. The second pump chamber includes a second indirect liquid chamber, a second coating liquid chamber, and a second diaphragm. The second diaphragm is used to separate the second indirect liquid chamber and the second coating liquid chamber. The second inlet and the second outlet are both connected to the second coating liquid chamber. The transmission module is used to move and squeeze the second indirect liquid chamber, causing the second diaphragm to deform toward the second coating liquid chamber, so that the coating liquid in the second coating liquid chamber is squeezed and flows out from the second outlet.

3. The coating liquid supply system according to claim 1, wherein The transmission module includes a drive module and an extrusion module connected in sequence. The drive module is used to drive the extrusion module to reciprocate between the first pump chamber and the second pump chamber.

4. The coating liquid supply system according to claim 3, wherein The drive module includes a connected motor and a coupling. The drive module is connected to the extrusion module through a connecting module. The connecting module includes a screw and a transmission mechanism disposed on the screw. The screw is connected to the coupling. The extrusion module is a plunger fixed to the transmission mechanism. The motor is used to drive the screw to rotate, so that the transmission mechanism drives the plunger to move.

5. The coating liquid supply system according to claim 4, wherein The connection module also includes a fixing block that is threadedly connected to the screw, one end of the transmission mechanism is fixedly connected to the fixing block, and the other end is fixedly connected to the plunger.

6. The coating liquid supply system according to claim 4, wherein The transmission module further includes a sensing module and a control module. The sensing module includes at least a first sensing module and a second sensing module. The first sensing module and the second sensing module are disposed on the moving path of the transmission mechanism, with the first sensing module close to the first pump chamber and the second sensing module close to the second pump chamber. The first sensing module and the second sensing module are respectively connected to the control module. The control module is used to acquire change information of the first sensing module when the transmission mechanism moves closer to the first sensing module, and to acquire change information of the second sensing module when the transmission mechanism moves closer to the second sensing module. The control module is also connected to the drive module and is further configured to control the motor to rotate forward or reverse according to the change information from the first sensing module or the second sensing module, so as to change the direction of movement of the transmission mechanism and the plunger.

7. The coating liquid supply system according to claim 6, wherein The coating liquid supply system further includes a first channel switching device and a second channel switching device. The first channel switching device includes a first common port, a first valve, and a second valve. The first common port is connected to the liquid replenishment device, the first valve is connected to the first liquid inlet, and the second valve is connected to the second liquid inlet. The second channel switching device includes a second common port, a third valve, and a fourth valve. The second common port is connected to the liquid supply end, the third valve is connected to the first liquid outlet, and the fourth valve is connected to the second liquid outlet. The control module is also connected to the first path switching device and the second path switching device, and is further configured to, when acquiring change information from the first sensing module, control the plunger to move towards the second pump chamber, and simultaneously control the first valve and the first common port to be connected, as well as the fourth valve and the second common port to be connected; when acquiring change information from the second sensing module, control the plunger to move towards the first pump chamber, and simultaneously control the second valve and the first common port to be connected, as well as the third valve and the second common port to be connected.

8. The coating liquid supply system according to claim 7, wherein The coating liquid supply system further includes a first control valve and a second control valve. The first control valve is disposed between the liquid replenishment device and the first channel switching device, and the second control valve is disposed between the liquid supply end and the second channel switching device. The first control valve and the second control valve are used to regulate the flow rate of the coating liquid.

9. The coating liquid supply system according to claim 8, wherein Both the first channel switching device and the second channel switching device are rotary directional valves; And / or, both the first control valve and the second control valve are pneumatically controlled liquid valves.

10. A coating apparatus characterized by comprising: The coating liquid supply system includes any one of claims 1-9.

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