Automatic cleaning system for solar cell coating machine

Abstract

The invention discloses an automatic cleaning system for a solar cell coating machine. The automatic cleaning system comprises a cleaning solvent bottle, a gear pump or a diaphragm pump, a cleaning solvent passage, a gas passage, an injection pump and a liquid receiving tank, the gear pump or the diaphragm pump is used for pumping a cleaning solvent of the cleaning solvent bottle into the cleaning solvent passage; the cleaning solvent passage and the gas passage are selectively communicated with the injection pump through the control valve; the gear pump or the diaphragm pump conveys the cleaning solvent to the coating head so as to clean the coating head; the solvent extruded by the coating head drops into the liquid receiving tank, and the waste liquid in the liquid receiving tank flows into the waste liquid recycling bottle through the control valve; the coating head can be automatically and circularly cleaned by automatically controlling the gear pump or the diaphragm pump and the on-off valve, and the circulating pipeline and the inner wall of the coating head are purged by compressed air or nitrogen, so that the pipeline and the inner wall of the coating head are relatively dry, the coating head is prevented from being manually and frequently disassembled, and the production efficiency is improved. And the time for manually cleaning the coating head is saved.

Description

Technical Field

[0001] This invention belongs to the technical field of coating machines, and more specifically, relates to an automatic cleaning system for a solar cell coating machine. Background Technology

[0002] A coating machine applies a solution to a glass surface through a coating head to form a film layer for perovskite solar cells. Efficient and rapid cleaning of the coating head is crucial when changing the solution, as the efficiency of the changeover and the effectiveness of the cleaning directly impact the coating machine's production cycle time and overall efficiency.

[0003] Current technology typically involves disassembling the coating head and cleaning each component individually. However, manual cleaning of the coating head requires operators to remove it from the machine, disassemble the modules, wipe and clean it manually, and then reassemble it. Because the coating head is heavy, this requires multiple people, consuming a significant amount of time. Frequent disassembly also negatively impacts the lifespan of the coating head, leading to increased production costs, reduced efficiency, and wasted manpower. Therefore, manual cleaning methods are inefficient and labor-intensive.

[0004] To address the aforementioned technical problems, this invention proposes an improved automatic cleaning system for solar cell coating machines. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an automatic cleaning system for solar cell coating machines. Through automatic control of gear pumps or diaphragm pumps and on / off valves, the system enables automatic cyclic cleaning of the coating head. Compressed air or nitrogen is then used to purge the circulation pipeline and the inner wall of the coating head, ensuring relative dryness. This system allows the coating machine to operate continuously, accelerating the production cycle and improving equipment efficiency. Simultaneously, it enhances product stability and reduces production costs. This invention solves the technical problems of existing manual coating head cleaning methods, which require multiple operators, consume significant time, involve frequent disassembly, and negatively impact the lifespan of the coating head, leading to increased production costs and reduced efficiency.

[0006] Specifically, the technical problem to be solved by the present invention is to address the shortcomings of the prior art. The present invention provides an automatic cleaning system for a solar cell coating machine, including a cleaning solvent bottle, a gear pump or diaphragm pump, a cleaning solvent passage, a gas passage, an injection pump, and a liquid receiving tank.

[0007] The gear pump or diaphragm pump pumps the cleaning solvent from the cleaning solvent bottle into the cleaning solvent passage.

[0008] The cleaning solvent passage and the gas passage are selectively connected to the injection pump via a control valve;

[0009] The gear pump or diaphragm pump delivers cleaning solvent to the coating head to clean the coating head;

[0010] The solvent squeezed out from the coating head drips into the receiving tank.

[0011] Preferably, a cleaning agent valve and a filter are connected in sequence between the cleaning solvent bottle and the inlet end of the gear pump or diaphragm pump.

[0012] Preferably, the cleaning solvent pathway includes the following:

[0013] A check valve connected to the outlet end of the gear pump or diaphragm pump;

[0014] A drying valve with one end connected to the one-way valve and the other end connected to one end of the waste liquid valve;

[0015] An exhaust valve is connected to the other end of the waste liquid valve;

[0016] A solvent valve connected to an exhaust valve, the solvent valve being connected to the injection pump.

[0017] Preferably, the gas passage includes the following:

[0018] Gas source;

[0019] A positive pressure reducing valve, a solenoid valve, and a check valve are connected in sequence to the gas source, and the check valve is connected to the normally closed end of the drying valve.

[0020] Preferably, the gas source is CDA gas or nitrogen.

[0021] Preferably, the normally closed end of the exhaust valve is connected to the coating head; the normally open end of the exhaust valve is connected to the normally closed end of the solvent valve; and the normally open end of the solvent valve is connected to the perovskite bottle.

[0022] Preferably, the bottom of the liquid receiving tank is provided with a leakage hole, the leakage hole is connected to a waste discharge valve, and the normally open end of the waste discharge valve is connected to a waste liquid bottle.

[0023] Preferably, the normally closed end of the waste discharge valve is connected to the normally open end of the cleaning agent valve.

[0024] Preferably, the CDA gas source is connected in sequence to a solenoid valve, a negative pressure regulating valve, and a vacuum generator, and the vacuum generator is connected to the waste liquid bottle.

[0025] Preferably, a liquid accumulation shut-off valve is connected between the leakage hole and the waste discharge valve, and a float switch is provided in the liquid receiving tank.

[0026] Compared with the prior art, the positive effects of the present invention are: (1) The present invention achieves automatic cleaning of the coating head and injection pump by controlling the gear pump or diaphragm pump and the on / off valve, avoiding frequent disassembly of the coating head and improving production efficiency; (2) Automatically controlling compressed air or nitrogen to purge the inner wall of the coating head, reducing the influence of the solvent in its inner wall on subsequent coating; (3) When collecting waste liquid, a negative pressure is formed in the waste liquid bottle to accelerate the rapid recovery of cleaning solvent. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the automatic cleaning system of the present invention;

[0028] The labels in the attached diagram are: 1-waste discharge valve, 2-cleaning agent valve, 3-drying valve, 4-waste liquid valve, 5-vent valve, 6-solvent valve. Detailed Implementation

[0029] The following is combined with Figure 1 The present invention will be further described with reference to specific embodiments.

[0030] Figure 1 A schematic diagram of the structure of an automatic cleaning system according to an embodiment of the present invention is shown. The automatic cleaning system for a solar cell coating machine includes a cleaning solvent bottle, a pump, a cleaning solvent passage, a gas passage, an injection pump, and a liquid receiving tank.

[0031] The pump pumps the cleaning solvent from the cleaning solvent bottle into the cleaning solvent passage;

[0032] The cleaning solvent passage and the gas passage are selectively connected to the injection pump via a control valve;

[0033] The pump delivers cleaning solvent to the coating head to clean the coating head;

[0034] The solvent squeezed out from the coating head drips into the receiving tank;

[0035] The pump is a gear pump or a diaphragm pump, and a cleaning agent valve 2 and a filter are connected in sequence between the cleaning solvent bottle and the inlet end of the pump.

[0036] The cleaning solvent pathway includes the following:

[0037] A check valve connected to the outlet end of the pump;

[0038] A drying valve 3, with one end connected to the one-way valve and the other end connected to one end of the waste liquid valve 4;

[0039] The exhaust valve 5 is connected to the other end of the waste liquid valve 4;

[0040] A solvent valve 6 is connected to the exhaust valve 5, and the solvent valve 6 is connected to the injection pump;

[0041] The gas passage includes the following: a gas source; a positive pressure reducing valve, a solenoid valve, and a check valve connected in sequence to the gas source, wherein the check valve is connected to the normally closed end of the drying valve 3; the gas source is CDA gas or nitrogen.

[0042] The normally closed end of the exhaust valve 5 is connected to the coating head; the normally open end of the exhaust valve 5 is connected to the normally closed end of the solvent valve 6; the normally open end of the solvent valve 6 is connected to the perovskite bottle.

[0043] The bottom of the liquid receiving tank is provided with a leakage hole, which is connected to a waste discharge valve 1. The normally open end of the waste discharge valve 1 is connected to a waste liquid bottle. The normally closed end of the waste discharge valve 1 is connected to the normally open end of the cleaning agent valve 2. The CDA gas source is connected in sequence to a solenoid valve, a negative pressure regulating valve, and a vacuum generator. The vacuum generator is connected to the waste liquid bottle. A liquid accumulation shut-off valve is connected between the leakage hole and the waste discharge valve 1. A float switch is provided in the liquid receiving tank.

[0044] This invention controls a gear pump or diaphragm pump and on / off valves to draw cleaning solvent from the cleaning solvent bottle through various control units into the coating head cavity. The solvent is squeezed out of the cavity and drips through the coating head lip into the receiving tank below. When the liquid level in the receiving tank reaches a limit, a float switch signals, the on / off valve opens, and the solvent enters the pipeline, forming a loop and circulating. After a certain number of cycles are reached, the on / off valve after the cleaning solvent bottle is activated to disconnect the circulation loop. Simultaneously, the on / off valve before the waste liquid bottle is activated, the negative pressure solenoid valve activates, and the pump continues to work, draining the solvent from the pipeline into the waste liquid bottle. The solenoid valve controlling compressed air or nitrogen is activated to introduce compressed air or nitrogen, purging the cleaning solvent from the coating head cavity surface and ensuring a relatively dry environment inside the coating head.

[0045] Furthermore, the piping downstream of the gear pump or diaphragm pump includes a flow sensor and a check valve, which can monitor the flow rate in the piping in real time, and the check valve prevents solution backflow. A filter upstream of the gear pump or diaphragm pump filters out impurities, ensuring the absolute cleanliness of the solvent entering the coating head during the cleaning process.

[0046] During the use of the cleaning system, after the cleaning solvent bottle is filled with solution and placed in the designated position, the sensor detects that the cleaning solvent bottle is in place and the liquid level is detected. At this time, the normally closed end of the cleaning agent valve 2 is closed, the normally closed end of the exhaust valve 5 is closed, and the gear pump or diaphragm pump starts to deliver the cleaning solvent to the coating head. The cleaning solvent squeezed out of the coating head drips into the receiving tank. When the liquid level in the receiving tank reaches the limit, the float switch floats up and gives a signal, the liquid accumulation stop valve opens, the normally closed end of the waste discharge valve 1 is closed, and the normally open end of the cleaning agent valve 2 is closed, and the solvent enters the circulation pipeline through the cleaning agent valve 2. After the cycle time is reached, a final cleaning of the coating head will be performed with clean solvent to ensure that the inner surface of the coating head is absolutely clean. At this time, the normally open end of the waste discharge valve 1 is turned on, and the waste liquid bottle generates a vacuum negative pressure action through the solenoid valve, negative pressure regulating valve, and vacuum generator connected in sequence by the CDA air source. The gear pump or diaphragm pump responsible for sucking up the cleaning solvent will stop working. After the waste solvent in the receiving tank is drained, the normally closed end of the drying valve 3 is turned on, the positive pressure solenoid valve is activated, and compressed air or nitrogen enters the pipeline to blow the solvent on the inner surface of the coating head into the receiving tank, and then discharge it into the waste liquid bottle.

[0047] If the injection pump is to be automatically cleaned (before cleaning the coating head), the normally open end of the exhaust valve 5 and the normally closed end of the solvent valve 6 are connected. This can be achieved by selecting and effectively controlling the cleaning of the pipeline.

[0048] When the perovskite solution is injected into the coating head via the syringe pump until the cavity is full and all air is expelled, the solution inside the cavity will overflow into the vent pipe. The excess perovskite solution flows through the vent valve 5 and the waste liquid valve 4 into the 100mL waste liquid bottle. It should be noted that by controlling the injection volume of the coating head, the perovskite solution is generally not injected in excess, which can be observed by observing the pipeline. Therefore, the 100mL waste liquid bottle is not commonly used in practice.

[0049] As can be seen, this invention achieves automatic cleaning of the coating head and injection pump by controlling the gear pump or diaphragm pump and the on / off valve, avoiding frequent disassembly of the coating head and improving production efficiency; it automatically controls compressed air or nitrogen to purge the inner surface of the coating head, reducing the impact of any residual solvent on subsequent coating; and when collecting waste liquid, it creates negative pressure inside the waste liquid bottle to accelerate the rapid recovery of solvent.

[0050] It is worth noting that the above description is merely illustrative to facilitate understanding of the inventive concept according to this disclosure. Although the operations are depicted in a specific order, this should be understood as requiring that such operations be performed in the specific order shown or in sequential order, or requiring that all illustrated operations be performed to achieve the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0051] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0052] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, their practical application, or improvements to the technology in the market, or to make others in the art...

[0053] The above description only illustrates the preferred technical solution of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof all reflect the principles of the present invention and should be within the technical scope of the present invention.

Claims

1. An automatic cleaning system for a solar cell coating machine, characterized in that, This includes cleaning solvent bottles, gear pumps or diaphragm pumps, cleaning solvent passages, gas passages, syringe pumps, and receiving tanks; The gear pump or diaphragm pump pumps the cleaning solvent from the cleaning solvent bottle into the cleaning solvent passage. The cleaning solvent passage and the gas passage are selectively connected to the injection pump via a control valve; The gear pump or diaphragm pump delivers cleaning solvent to the coating head to clean the coating head; The solvent squeezed out from the coating head drips into the receiving tank.

2. The automatic cleaning system for a solar cell coating machine as described in claim 1, characterized in that, A cleaning agent valve (2) and a filter are connected in sequence between the cleaning solvent bottle and the inlet end of the gear pump or diaphragm pump.

3. The automatic cleaning system for a solar cell coating machine as described in claim 1, characterized in that, The cleaning solvent pathway includes the following: A check valve connected to the outlet end of the gear pump or diaphragm pump; A drying valve (3) with one end connected to the one-way valve and the other end connected to one end of the waste liquid valve (4); An exhaust valve (5) is connected to the other end of the waste liquid valve (4); A solvent valve (6) is connected to the exhaust valve (5), and the solvent valve (6) is connected to the injection pump.

4. An automatic cleaning system for a solar cell coating machine as described in claim 3, characterized in that, The gas passage includes the following: Gas source; A positive pressure reducing valve, a solenoid valve, and a check valve are connected in sequence to the gas source. The check valve is connected to the normally closed end of the drying valve (3).

5. An automatic cleaning system for a solar cell coating machine as described in claim 4, characterized in that, The gas source is CDA gas or nitrogen.

6. An automatic cleaning system for a solar cell coating machine as described in claim 5, characterized in that, The normally closed end of the exhaust valve (5) is connected to the coating head; the normally open end of the exhaust valve (5) is connected to the normally closed end of the solvent valve (6); the normally open end of the solvent valve (6) is connected to the perovskite bottle.

7. An automatic cleaning system for a solar cell coating machine as described in claim 6, characterized in that, The bottom of the liquid receiving tank is provided with a leakage hole, which is connected to a waste discharge valve (1). The normally open end of the waste discharge valve (1) is connected to a waste liquid bottle.

8. An automatic cleaning system for a solar cell coating machine as described in claim 7, characterized in that, The normally closed end of the waste discharge valve (1) is connected to the normally open end of the cleaning agent valve (2).

9. An automatic cleaning system for a solar cell coating machine as described in claim 8, characterized in that, The CDA gas source is connected in sequence to a solenoid valve, a negative pressure regulating valve, and a vacuum generator, with the vacuum generator connected to the waste liquid bottle.

10. An automatic cleaning system for a solar cell coating machine as described in claim 9, characterized in that, A liquid accumulation shut-off valve is connected between the leakage hole and the waste discharge valve (1), and a float switch is provided in the liquid receiving tank.

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