Liquid injection device, coating equipment and control method

Abstract

The invention belongs to the technical field of vacuum coating, and discloses a liquid injection device, coating equipment and a control method.The liquid injection device comprises a medicine bottle, a liquid injection pump, a flow divider, a first switch valve, an exhaust bottle, a second switch valve and a liquid injection nozzle, and the flow divider is provided with a main flow channel, a liquid inlet flow channel, an exhaust flow channel and a plurality of flow dividing flow channels; the liquid inlet flow channel, the exhaust flow channel and the multiple flow dividing flow channels communicate with the main flow channel, the exhaust flow channel is arranged above the multiple flow dividing flow channels, and the liquid injection pump communicates with the medicine bottle and the liquid inlet flow channel; the first switch valve is communicated with the exhaust flow channel and the exhaust bottle, the second switch valves and the liquid injection nozzles are arranged in one-to-one correspondence with the flow dividing flow channels, and the second switch valves are communicated with the flow dividing flow channels and the liquid injection nozzles in one-to-one correspondence. According to the liquid injection device provided by the invention, bubbles are effectively prevented from flowing out of the liquid injection nozzle along with the coating liquid, and the coating quality is ensured.

Description

Technical Field

[0001] The present invention relates to the field of vacuum coating technology, and in particular to a liquid injection device, coating equipment and a control method. Background Art

[0002] Antifouling films have been applied to various optoelectronic components such as touch screens and lenses. In particular, with the development of information technology, the market demand for touch screen products has grown rapidly in recent years. In order to increase the antifouling effect of various optoelectronic products, mainly touch screens, coating antifouling films on their surfaces has become an indispensable process.

[0003] At present, antifouling films are generally coated by vacuum evaporation. In order to ensure the coating quality of the product, the liquid injection device of the coating equipment usually adopts a continuous liquid injection method for coating.

[0004] In the prior art, the liquid injection device has the following problems: the coating liquid is highly volatile and easily generates bubbles, which causes the coating liquid flowing out of the liquid injection nozzle to be uneven and there is a liquid volume deviation, which affects the coating quality. Therefore, a liquid injection device, a coating device and a control method are urgently needed to solve the above technical problems. Summary of the invention

[0005] An object of the present invention is to provide a liquid injection device which can effectively prevent bubbles from flowing out of the liquid injection nozzle along with the coating liquid, thereby effectively ensuring the coating quality.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A liquid injection device is provided, comprising:

[0008] Medicine bottles;

[0009] An injection pump, wherein the liquid inlet of the injection pump is connected to the medicine bottle;

[0010] A flow divider, wherein the flow divider is provided with a main flow channel, a liquid inlet flow channel, an exhaust flow channel and a plurality of branch flow channels, wherein the liquid inlet flow channel, the exhaust flow channel and the plurality of branch flow channels are all connected to the main flow channel, and the exhaust flow channel is arranged above the plurality of branch flow channels, and the liquid inlet flow channel is connected to the liquid outlet of the injection pump;

[0011] a first switch valve, wherein a first end of the first switch valve is connected to the exhaust flow channel;

[0012] An exhaust bottle, connected to the second end of the first switch valve;

[0013] A plurality of second switch valves, wherein the first ends of the plurality of second switch valves are connected to the plurality of the flow diversion channels in a one-to-one correspondence;

[0014] A plurality of liquid injection nozzles are connected to the second ends of the plurality of second switch valves in a one-to-one correspondence.

[0015] Optionally, the liquid injection nozzle is arranged below the exhaust bottle.

[0016] Optionally, the injection nozzles are arranged at intervals in the vertical direction.

[0017] Optionally, a third switch valve is further included, wherein a first end of the third switch valve is connected to the medicine bottle, and a second end of the third switch valve is connected to the exhaust bottle.

[0018] Optionally, the exhaust bottle is arranged above the medicine bottle.

[0019] Optionally, the medicine bottle is connected to a gas cylinder, and the gas cylinder is used to introduce inert gas into the medicine bottle.

[0020] Optionally, the exhaust bottle is connected to a negative pressure device, and the negative pressure device is used to extract the gas in the exhaust bottle.

[0021] Optionally, the main flow channel is extended in the vertical direction, and a plurality of the branch flow channels are arranged at intervals in the vertical direction.

[0022] Optionally, the main flow channel has an exhaust connection portion and a liquid injection connection portion arranged in sequence from top to bottom, and the cross-sectional area of ​​the main flow channel gradually increases along the vertical direction from top to bottom; wherein,

[0023] The exhaust connection portion is connected to the exhaust flow channel, and the liquid injection connection portion is connected to the liquid inlet flow channel and the diversion flow channel.

[0024] Another object of the present invention is to provide a coating device, comprising a vacuum chamber and the above-mentioned liquid injection device, wherein the liquid injection nozzle is connected to the vacuum chamber.

[0025] Another object of the present invention is to provide a control method applied to the above-mentioned liquid injection device.

[0026] To achieve this object, the present invention adopts the following technical solutions:

[0027] A control method applied to the above-mentioned liquid injection device comprises the following steps:

[0028] S100, controlling all the second switch valves to close, controlling the first switch valve to open, and controlling the injection pump to open, so that the coating liquid in the medicine bottle flows into the main channel and the bubbles in the main channel are discharged to the exhaust bottle.

[0029] Optionally, the control method further comprises the following steps:

[0030] S200, controlling the first switch valve to close, controlling the second switch valves to open one by one, and controlling the injection pump to open, so that the coating liquid in the medicine bottle flows out through the multiple injection nozzles in sequence.

[0031] Optionally, the control method further comprises the following steps:

[0032] S300, controlling the first switch valve to open, controlling all the second switch valves to close, and controlling the injection pump to close, so that the bubbles in the injection nozzle flow back into the main channel.

[0033] Beneficial effects:

[0034] The liquid injection device provided by the present invention opens the first switch valve and closes the second switch valve. Under the action of the liquid injection pump, the coating liquid in the medicine bottle flows into the main channel through the liquid inlet channel, so that the liquid level of the coating liquid in the main channel rises above the branch flow channel, and the bubbles floating above the coating liquid are discharged into the exhaust bottle through the exhaust flow channel. When the second switch valve is opened and the first switch valve is closed, and the liquid injection pump is turned on, the coating liquid in the medicine bottle flows out from the liquid injection nozzle through the liquid inlet channel, the main channel and the branch flow channel in sequence, and the bubbles remaining in the main channel and the bubbles in the exhaust bottle are prevented from flowing out from the liquid injection nozzle with the coating liquid, thereby effectively ensuring the coating quality.

[0035] The coating equipment provided by the present invention can effectively prevent bubbles from flowing out of the coating liquid from the liquid injection nozzle through the design of the liquid injection device, so as to ensure the coating quality.

[0036] The control method provided by the present invention effectively prevents the bubbles remaining in the main flow channel and the bubbles in the exhaust bottle from flowing out of the liquid injection nozzle along with the coating liquid, so as to ensure the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the liquid injection device provided by the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of the liquid injection nozzle provided by the present invention;

[0039] Figure 3 It is a schematic structural diagram of an embodiment of the flow divider provided by the present invention;

[0040] Figure 4 It is a schematic structural diagram of another embodiment of the diverter provided by the present invention.

[0041] In the figure:

[0042] 10. Products;

[0043] 100. Medicine bottle;

[0044] 200, injection pump;

[0045] 300, flow divider; 301, exhaust connection; 302, liquid injection connection; 310, main flow channel; 320, liquid inlet flow channel; 330, exhaust flow channel; 340, flow divider flow channel;

[0046] 400, a first switch valve;

[0047] 500, exhaust bottle; 510, third switch valve;

[0048] 600, second switch valve;

[0049] 700, injection nozzle;

[0050] 800. Branch pipe. DETAILED DESCRIPTION

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0055] Embodiment 1

[0056] This embodiment provides a coating device, including a vacuum chamber and a liquid injection device.

[0057] Specifically, Figures 1 to 4 As shown, the liquid injection device includes a medicine bottle 100, a liquid injection pump 200, a diverter 300, a first switch valve 400, an exhaust bottle 500, a second switch valve 600 and a liquid injection nozzle 700. The liquid injection nozzle 700 is connected to the vacuum chamber, which can be understood as the coating equipment performs a coating process on the product 10 under the vacuum condition of the vacuum chamber.

[0058] Specifically, the flow divider 300 is provided with a main flow channel 310, a liquid inlet flow channel 320, an exhaust flow channel 330 and a plurality of branch flow channels 340. The liquid inlet flow channel 320, the exhaust flow channel 330 and the plurality of branch flow channels 340 are all connected to the main flow channel 310, and the exhaust flow channel 330 is arranged above the plurality of branch flow channels 340. Further, the liquid inlet of the injection pump 200 is connected to the medicine bottle 100, and the liquid outlet of the injection pump 200 is connected to the liquid inlet flow channel 320; the first end of the first switch valve 400 is connected to the exhaust flow channel 330, and the second end of the first switch valve 400 is connected to the exhaust bottle 500.

[0059] Specifically, the second switch valve 600 and the injection nozzle 700 are provided in plurality and are arranged in one-to-one correspondence with the diversion flow channel 340. Further, the first ends of the plurality of second switch valves 600 are arranged in one-to-one correspondence with the plurality of diversion flow channels 340, and the second ends of the plurality of second switch valves 600 are arranged in one-to-one correspondence with the plurality of injection nozzles 700.

[0060] In this embodiment, the design of the liquid injection device can effectively prevent bubbles from flowing out of the liquid injection nozzle 700 along with the coating liquid, so as to ensure the coating quality. Specifically, the first switch valve 400 is opened, and the second switch valve 600 is closed. Under the action of the liquid injection pump 200, the coating liquid in the medicine bottle 100 flows into the main channel 310 through the liquid inlet channel 320, so that the liquid level of the coating liquid in the main channel 310 rises above the branch channel 340, and the bubbles floating above the coating liquid are discharged into the exhaust bottle 500 through the exhaust channel 330. When the second switch valve 600 is opened and the first switch valve 400 is closed, and the injection pump 200 is turned on, the coating liquid in the medicine bottle 100 flows out from the injection nozzle 700 through the liquid inlet channel 320, the main channel 310 and the branch channel 340 in sequence, wherein the bubbles in the coating liquid float up in the main channel 310, effectively preventing the residual bubbles in the main channel 310 and the bubbles in the exhaust bottle 500 from flowing out from the injection nozzle 700 with the coating liquid, thereby ensuring the coating quality.

[0061] In a feasible implementation, the second switch valves 600 are opened one by one, and under the action of the injection pump 200, the coating liquid in the medicine bottle 100 flows out through the multiple injection nozzles 700 in sequence, effectively ensuring the coating quality. In this embodiment, the second switch valves 600 are opened one by one, which means that the second switch valves 600 are opened one by one, and while one of the second switch valves 600 is controlled to be opened, the other second switch valves 600 are controlled to be closed. It can be understood that when coating the product 10, the injection nozzles 700 inject liquid one by one.

[0062] In a possible implementation, Figure 1 As shown, the first switch valve 400 is a pneumatic switch valve, and the first switch valve 400 is integrated on the exhaust bottle 500. Of course, the first switch valve 400 can also be a solenoid valve or a valve of other driving forms, which is not specifically limited in this application.

[0063] In a possible implementation, Figure 1 and Figure 2 As shown, the second switch valve 600 is a pneumatic switch valve, and the second switch valve 600 is integrated on the liquid injection nozzle 700. Of course, the second switch valve 600 can also be a solenoid valve or a valve of other driving forms, which is not specifically limited in this application.

[0064] In a possible implementation, Figure 1 As shown, the injection nozzles 700 are arranged at intervals in the vertical direction so that the injection device can meet the coating requirements of products 10 of various sizes and models, and the injection device can use the injection nozzles 700 to inject liquid from top to bottom in sequence to perform coating, effectively ensuring the coating quality.

[0065] In a feasible implementation manner, the exhaust bottle 500 may be 150 mm to 200 mm higher than the highest liquid injection nozzle 700 .

[0066] In a possible implementation, Figure 1 As shown, the flow divider 300 is not higher than the highest liquid injection nozzle 700. Preferably, the central area of ​​the main flow channel 310 of the flow divider 300 along the vertical direction can be 500-900 mm lower than the highest liquid injection nozzle 700.

[0067] Exemplarily, the injection nozzles 700 are arranged at intervals in the vertical direction. When the multiple injection nozzles 700 are controlled to inject liquid in sequence by the injection pump 200 and the second switch valve 600, under the action of gravity, the liquid pressures at the injection nozzles 700 at different heights are different, that is, the injection amounts of the injection nozzles 700 at different heights are deviated per unit time. In order to ensure the quality of the coating, it is necessary to compensate for the difference in the injection amounts of the injection nozzles 700 at different heights.

[0068] Specifically, the ideal injection volume of each injection nozzle 700 is SV1, and the constant compensation injection volume of each injection nozzle 700 is SV2, then the actual required injection volume SV of each injection nozzle 700 is SV=SV1+SV2. It can be understood that: under normal conditions, the injection volume achieved by the injection pump 200 in the injection time T1 is SV, but because of the height position of the injection nozzle 700, the injection volume achieved by the injection pump 200 in the injection time T1 is SV1, and at this time, it is necessary to compensate for the injection volume SV2, that is, the injection pump 200 injects for another T2 time, so that the injection nozzle 700 reaches the required actual injection volume SV.

[0069] The value of SV2 is related to the height of the injection nozzle 700. Figure 1 As shown, there are 6 injection nozzles 700 and they are evenly spaced in the vertical direction. The height difference between the 6 injection nozzles 700 is 300mm-500mm, such as 350mm, 400mm or 450mm. The value range of the constant compensation injection volume SV2 of the 6 injection nozzles 700 is: 0-1ml. Preferably, the constant compensation injection volume SV2 of the 6 injection nozzles 700 from top to bottom are: 0.3ml, 0.2ml, 0.1ml, 0ml, 0ml, 0ml, among which, the injection volume error of the lower 3 injection nozzles 700 is extremely small and can be ignored without compensation.

[0070] At present, when the liquid injection device is not operating, that is, when it is stationary, the branch pipe 800 between the liquid injection nozzle 700 and the branch flow channel 340 of the diverter 300 cannot be absolutely sealed, and the liquid injection nozzle 700 also has a certain leakage rate and the second switch valve 600 is not tightly sealed, resulting in bubbles in the liquid injection nozzle 700 and the branch pipe 800, which will affect the coating quality when the liquid injection device is used next time. In a feasible implementation, the injection nozzle 700 is arranged below the exhaust bottle 500. When the injection device is stationary, that is, the second switch valve 600 is closed, the first switch valve 400 is opened, the exhaust flow channel 330 is connected to the exhaust bottle 500, and the exhaust bottle 500 can be connected to the atmosphere, that is, the diverter 300 is connected to the atmosphere through the exhaust flow channel 330 and the exhaust bottle 500. Under the action of gravity, the bubbles in the injection nozzle 700 and the branch pipe 800 are floated, so that the bubbles in the injection nozzle 700 and the branch pipe 800 flow back to the main channel 310, that is, the bubbles are discharged from the injection nozzle 700 and the branch pipe 800, and the coating quality of the next operation of the injection device is effectively guaranteed. Among them, the coating liquid in the exhaust bottle 500 is generated by the bursting of bubbles.

[0071] In a feasible implementation, in order to prevent the coating liquid in the exhaust bottle 500 from affecting the connection between the diverter 300 and the atmosphere, a first connection port (not shown) may be provided on the side or top of the exhaust bottle 500, and the first connection port is connected to the first switch valve 400. Of course, the first connection port may also be provided at the bottom of the exhaust bottle 500, which is not specifically limited in the present application.

[0072] For example, when the liquid injection device is stationary, due to the different heights of the liquid injection nozzle 700, that is, the pressure of the liquid injection nozzle 700 is different, the bubbles in the liquid injection nozzle 700 and the branch pipe 800 may not be completely discharged, and the amount of residual bubbles is also different. In order to ensure the quality of the coating, it is necessary to introduce a conditional compensation liquid injection amount SV3 to the liquid injection nozzle 700, and the actual required liquid injection amount SV of each liquid injection nozzle 700 = SV1 + SV2 + SV3. In this embodiment, whether the conditional compensation liquid injection amount is introduced needs to be determined according to the actual influencing factors, which include the positional relationship between the liquid injection nozzle 700, the exhaust bottle 500 and the diverter 300, the sealing condition of the branch pipe 800, the leakage rate of the liquid injection nozzle 700 and the sealing condition of the second switch valve 600, etc.

[0073] For example Figure 1 As shown in the figure, the arrangement of the injection nozzles 700 is provided with 6 injection nozzles 700 and arranged at equal intervals in the vertical direction, and the value range of the conditional compensation injection volume SV3 of the 6 injection nozzles 700 is: 0-5ml. Preferably, the conditional compensation injection volume SV3 of the 6 injection nozzles 700 from top to bottom are: 0.5ml, 0.4ml, 0.3ml, 0.2ml, 0.1ml, 0ml.

[0074] In this embodiment, due to the aging of the injection nozzle 700, the branch pipe 800 and the second switch valve 600, and the pressure shock during use, the leakage rate of the injection nozzle 700 and the branch pipe 800 will change. Therefore, the injection amount of each injection nozzle 700 after the injection device is left to stand can be re-measured at regular intervals, and the value of SV3 can be modified in time to ensure the quality of the coating.

[0075] In a possible implementation, Figure 3 As shown, the main flow channel 310 is extended in the vertical direction, and the plurality of branch flow channels 340 are arranged at intervals in the vertical direction, which facilitates the molding and manufacturing of the diverter 300 and the pipeline connection between the injection nozzle 700 and the diverter 300.

[0076] Specifically, the second switch valves 600 corresponding to the injection nozzles 700 arranged from top to bottom are connected to the diverter flow channels 340 arranged from top to bottom in a one-to-one correspondence. It can be understood that the second switch valve 600 corresponding to the Nth injection nozzle 700 arranged from top to bottom is connected to the Nth diverter flow channel 340 arranged from top to bottom, wherein N is a positive integer greater than or equal to 1, which is conducive to the arrangement of the diverter branch pipe 800, and convenient for positioning and connection, and easy to identify and control the injection amount of the injection nozzle 700.

[0077] Specifically, the liquid inlet channel 320 can be connected to the lower end of the main channel 310, effectively preventing the coating liquid from splashing and generating bubbles during the process of flowing from the liquid inlet channel 320 into the main channel 310, and is suitable for discharging the bubbles in the main channel 310 into the exhaust bottle 500.

[0078] In a possible implementation, Figure 4 As shown, the main channel 310 has an exhaust connection part 301 and a liquid injection connection part 302 arranged in sequence from top to bottom, and the cross-sectional area of ​​the main channel 310 gradually increases from top to bottom in the vertical direction; wherein, the exhaust connection part 301 is connected to the exhaust channel 330, and the liquid injection connection part 302 is connected to the liquid inlet channel 320 and the diversion channel 340, and the structure is compact. In this embodiment, the cross-sectional area of ​​the main channel 310 gradually increases from top to bottom in the vertical direction, which is conducive to the bubbles in the main channel 310 floating to the exhaust connection part 301. For example, the shape of the main channel 310 is a trapezoid. Of course, the shape of the main channel 310 can also be other shapes, which is not specifically limited in this application.

[0079] In this embodiment, the liquid injection device further includes a third switch valve 510, a first end of the third switch valve 510 is connected to the medicine bottle 100, and a second end of the third switch valve 510 is connected to the exhaust bottle 500. In this embodiment, the medicine bottle 100 and the exhaust bottle 500 can be connected by controlling the third switch valve 510, so that the coating liquid in the exhaust bottle 500 flows into the medicine bottle 100, thereby saving the use of the coating liquid.

[0080] In a feasible implementation, the third switch valve 510 is a pneumatic switch valve, and the third switch valve 510 is integrated on the exhaust bottle 500. Of course, the third switch valve 510 can also be a solenoid valve or a valve of other driving forms, which is not specifically limited in this application.

[0081] In a feasible implementation, a liquid level meter (not shown) may be provided in the exhaust bottle 500, and the liquid level in the exhaust bottle 500 may be detected by the liquid level meter. When the liquid level in the exhaust bottle 500 reaches a certain value, the third switch valve 510 may be opened to allow the coating liquid in the exhaust bottle 500 to flow into the medicine bottle 100. Furthermore, the liquid level in the exhaust bottle 500 may be controlled to be maintained within a certain range through the detection of the liquid level meter, so that when the liquid injection device is stationary, there is enough coating liquid in the exhaust bottle 500 to supplement the loss of the liquid injection nozzle 700 and the branch pipe 800.

[0082] In a possible implementation, Figure 1 As shown, the exhaust bottle 500 can be arranged above the medicine bottle 100. When the third switch valve 510 is opened, under the action of gravity, the coating liquid in the exhaust bottle 500 can automatically flow into the medicine bottle 100, which is convenient for control.

[0083] In a feasible implementation, a second connection port (not shown) may be provided at the bottom of the exhaust bottle 500 , and the second connection port is connected to the third switch valve 510 , which facilitates the automatic flow of the coating liquid in the exhaust bottle 500 into the medicine bottle 100 .

[0084] In a feasible implementation, the first switch valve 400 and the third switch valve 510 may be the same valve, and it can be understood that the exhaust channel 330 and the exhaust bottle 500, as well as the exhaust bottle 500 and the medicine bottle 100 can be connected or disconnected at the same time by opening or closing the valve. When the liquid injection device is stationary, when the valve is opened, the coating liquid in the exhaust bottle 500 flows into the medicine bottle 100, effectively ensuring that the diverter 300 is connected to the atmosphere through the exhaust bottle 500.

[0085] In this embodiment, the exhaust bottle 500 is connected to a negative pressure device (not shown), which is used to extract the gas in the exhaust bottle 500 and accelerate the breaking of bubbles in the exhaust bottle 500.

[0086] In a feasible implementation manner, the exhaust bottle 500 is connected to an air compression device (not shown), which facilitates the coating liquid in the exhaust bottle 500 to flow into the medicine bottle 100 .

[0087] In this embodiment, the medicine bottle 100 is connected to a gas cylinder (not shown), and the gas cylinder is used to pass an inert gas into the medicine bottle 100. In this embodiment, the inert gas is passed into the medicine bottle 100 to effectively prevent the coating solution from reacting with the air, and to ensure that a certain pressure is maintained in the medicine bottle 100, effectively reducing the volatilization of the coating solution, thereby preventing the coating solution in the medicine bottle 100 from precipitating bubbles, reducing the amount of bubbles entering the diverter 300, and further ensuring the coating quality.

[0088] In a feasible implementation, a first air vent (not shown) is also provided on the medicine bottle 100 , and the first air vent is connected to a pressure relief valve (not shown) to effectively prevent the occurrence of excessive pressure in the medicine bottle 100 .

[0089] In a feasible implementation, the medicine bottle 100 is further provided with a second air outlet (not shown), the second air outlet is connected to a one-way valve (not shown) and a fourth switch valve (not shown), and the second air outlet is opened and closed by the fourth switch valve. Specifically, the fourth switch valve is a pneumatic switch valve. Of course, the fourth switch valve can also be a solenoid valve or a valve of other driving forms, which is not specifically limited in this application.

[0090] In this embodiment, the coating device further includes a controller (not shown), and the operation of the liquid injection device is controlled by the controller. The controller may include, for example, but is not limited to, a programmable logic controller (PLC). In this embodiment, the ideal liquid injection volume SV1 of each liquid injection nozzle 700, the constant compensation liquid injection volume SV2 of each liquid injection nozzle 700, and the conditional compensation liquid injection volume SV3 of each liquid injection nozzle 700 can all be regulated by the controller to make the liquid injection device adapt to the required coating requirements.

[0091] Embodiment 2

[0092] Based on the above content and the same concept, the present application provides a control method. The control method can be applied to the liquid injection device described in any of the above embodiments, and it can also be understood that the above liquid injection device can be controlled based on the control method. The control method includes the following steps:

[0093] S100, control all the second switch valves 600 to close, control the first switch valve 400 to open, and control the injection pump 200 to open, so that the coating liquid in the medicine bottle 100 flows into the main channel 310 and discharges the bubbles in the main channel 310 to the exhaust bottle 500.

[0094] In this embodiment, step S100 can be applied before coating the product 10 to effectively prevent the bubbles remaining in the main channel 310 and the bubbles in the exhaust bottle 500 from flowing out of the injection nozzle 700 along with the coating liquid.

[0095] In a feasible implementation, in step S100, the second switch valve 600 may be controlled to be closed first, the first switch valve 400 may be controlled to be opened, and finally the injection pump 200 may be controlled to be opened. After step S100 is completed, the injection pump 200 may be controlled to be closed first, and then the first switch valve 400 may be controlled to be closed. Of course, step S100 may also be other control sequences, which are not specifically limited in this application.

[0096] In a feasible implementation, before the liquid injection device is left stationary, step S100 can be executed to discharge all bubbles in the main channel 310 into the exhaust bottle 500. When the liquid injection device is left stationary, it is more conducive to discharge the bubbles from the liquid injection nozzle 700 and the branch pipe 800.

[0097] In a feasible implementation, when the liquid level in the exhaust bottle 500 reaches a certain value, the third switch valve 510 can be opened to allow the coating liquid in the exhaust bottle 500 to flow into the medicine bottle 100. In this embodiment, in order to accelerate the collapse of bubbles, the gas in the exhaust bottle 500 can be extracted by a negative pressure device.

[0098] In this embodiment, the control method further includes the following steps:

[0099] S200, control the first switch valve 400 to close, control the second switch valves 600 to open one by one, and control the injection pump 200 to open, so that the coating liquid in the medicine bottle 100 flows out through the multiple injection nozzles 700 in sequence.

[0100] Specifically, in step S200, opening the second switch valves 600 one by one means that the second switch valves 600 are opened one by one, and while one of the second switch valves 600 is controlled to be opened, the remaining second switch valves 600 are controlled to be closed. It can be understood that when coating the product 10, the injection nozzle 700 injects liquid one by one.

[0101] In this embodiment, the coating of the product 10 is completed by an injection pump 200, which effectively reduces the cost of the injection device while ensuring the coating quality.

[0102] Specifically, step S200 includes the following steps:

[0103] S210 , sequentially controlling the first switch valve 400 to close, controlling one of the second switch valves 600 to open, and controlling the injection pump 200 to open.

[0104] In step S210 , one of the second switch valves 600 is controlled to be opened, while the other second switch valves 600 are controlled to be closed.

[0105] In this embodiment, step S210 may also be other control sequences, which are not specifically limited in this application.

[0106] S220 , while controlling the opened second switch valve 600 to close, control the other second switch valve 600 to open.

[0107] After the liquid injection nozzle 700 corresponding to the second switch valve 600 opened in step S210 completes the liquid injection, step S220 is executed.

[0108] In step S220, the injection pump 200 may be first controlled to be closed, and then the opened second switch valve 600 may be controlled to be closed while another second switch valve 600 may be controlled to be opened, and finally the injection pump 200 may be turned on again. The injection pump 200 may also be kept in an open state all the time.

[0109] S230, repeat step S220 until all the injection nozzles 700 have completed injection.

[0110] Specifically, the actual required injection amount SV of each injection nozzle 700 is controlled to be SV=SV1+SV2, or the actual required injection amount SV of each injection nozzle 700 is controlled to be SV=SV1+SV2+SV3.

[0111] In a feasible implementation, when coating the product 10, the second switch valves 600 corresponding to the injection nozzles 700 from top to bottom are controlled to open one by one, that is, the injection nozzles 700 inject liquid in sequence from top to bottom, which can effectively ensure the uniformity of the coating of the product 10 and ensure the coating quality.

[0112] In a feasible implementation, step S100 may be performed once after one or more injection nozzles 700 have completed injection, so as to ensure that the liquid level of the coating liquid in the main channel 310 is always above the branch channel 340, and effectively reduce the bubbles in the main channel 310, thereby preventing the bubbles from flowing out of the injection nozzle 700 along with the coating liquid. Exemplarily, step S100 is performed once after each injection nozzle 700 has completed injection, or step S100 is performed once after every two, four, six or eight injection nozzles 700 have completed injection.

[0113] In this embodiment, the control method further includes the following steps:

[0114] S300 , control the first switch valve 400 to open, control all the second switch valves 600 to close, and control the injection pump 200 to close, so that the bubbles in the injection nozzle 700 flow back into the main channel 310 .

[0115] In this embodiment, step S300 can be applied when the liquid injection device is stationary. Specifically, when the liquid injection device is stationary, liquid leakage will occur at the liquid injection nozzle 700 and the second switch valve 600, resulting in bubbles in the liquid injection nozzle 700 and the branch pipe 800. The first switch valve 400 is controlled to open, and all the second switch valves 600 are controlled to close, so that the bubbles in the liquid injection nozzle 700 and the branch pipe 800 flow back into the main channel 310, effectively ensuring the coating quality of the liquid injection device when it is operated next time.

[0116] For the specific execution process and principle of each device in the above steps, please refer to the above related introduction, which will not be repeated here.

[0117] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A liquid injection device, characterized in that: include: Medicine Bottle (100); An infusion pump (200), wherein a liquid inlet of the infusion pump (200) is connected to the medicine bottle (100); A flow divider (300), the flow divider (300) being provided with a main flow channel (310), a liquid inlet flow channel (320), an exhaust flow channel (330) and a plurality of diverter flow channels (340); the liquid inlet flow channel (320), the exhaust flow channel (330) and the plurality of diverter flow channels (340) are all arranged in communication with the main flow channel (310), and the exhaust flow channel (330) is arranged above the plurality of diverter flow channels (340); the liquid inlet flow channel (320) is arranged in communication with a liquid outlet of the injection pump (200); a first switch valve (400), wherein a first end of the first switch valve (400) is connected to the exhaust flow channel (330); An exhaust bottle (500) is connected to the second end of the first switch valve (400); A plurality of second switch valves (600), wherein first ends of the plurality of second switch valves (600) are connected to the plurality of flow diversion channels (340) in a one-to-one correspondence; A plurality of liquid injection nozzles (700) are provided, and the plurality of liquid injection nozzles (700) are connected to the second ends of the plurality of second switch valves (600) in a one-to-one correspondence.

2. The liquid injection device according to claim 1, characterized in that: The liquid injection nozzle (700) is arranged below the exhaust bottle (500).

3. The liquid injection device according to claim 2, characterized in that: The liquid injection nozzles (700) are arranged at intervals along the vertical direction.

4. The liquid injection device according to claim 1, characterized in that: It also includes a third switch valve (510), wherein a first end of the third switch valve (510) is connected to the medicine bottle (100), and a second end of the third switch valve (510) is connected to the exhaust bottle (500).

5. The liquid injection device according to claim 1, characterized in that: The exhaust bottle (500) is arranged above the medicine bottle (100).

6. The liquid injection device according to claim 1, characterized in that: The medicine bottle (100) is connected to a gas cylinder, and the gas cylinder is used to introduce an inert gas into the medicine bottle (100).

7. The liquid injection device according to claim 1, characterized in that: The exhaust bottle (500) is connected to a negative pressure device, and the negative pressure device is used to extract the gas in the exhaust bottle (500).

8. The liquid injection device according to any one of claims 1 to 7, characterized in that: The main flow channel (310) is extended in the vertical direction, and the plurality of branch flow channels (340) are arranged at intervals in the vertical direction.

9. The liquid injection device according to any one of claims 1 to 7, characterized in that: The main flow channel (310) has an exhaust connection portion (301) and a liquid injection connection portion (302) arranged in sequence from top to bottom, and the cross-sectional area of ​​the main flow channel (310) gradually increases from top to bottom in the vertical direction; wherein, The exhaust connection portion (301) is connected to the exhaust flow channel (330), and the liquid injection connection portion (302) is connected to the liquid inlet flow channel (320) and the diversion flow channel (340).

10. A coating device, characterized in that: It comprises a vacuum chamber and a liquid injection device as described in any one of claims 1 to 9, wherein the liquid injection nozzle (700) is connected to the vacuum chamber.

11. A control method used in a liquid injection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S100, controlling all the second switch valves (600) to close, controlling the first switch valve (400) to open, and controlling the injection pump (200) to open, so that the coating liquid in the medicine bottle (100) flows into the main channel (310) and the bubbles in the main channel (310) are discharged to the exhaust bottle (500).

12. The control method according to claim 11, characterized in that: The control method further comprises the following steps: S200, controlling the first switch valve (400) to close, controlling the second switch valves (600) to open one by one, and controlling the injection pump (200) to open, so that the coating liquid in the medicine bottle (100) flows out through the multiple injection nozzles (700) in sequence.

13. The control method according to claim 11, characterized in that: The control method further comprises the following steps: S300, control the first switch valve (400) to open, control all the second switch valves (600) to close, and control the injection pump (200) to close, so that the bubbles in the injection nozzle (700) flow back into the main channel (310).

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