Feeding system and coating equipment

Abstract

The utility model relates to a feeding system and coating equipment. The feeding system comprises a slurry tank provided with a storage cavity and an output port communicated with the storage cavity, the storage cavity is used for storing slurry, and the output port is used for outputting the slurry in the storage cavity; the first injection pump is provided with a first feed port and a first discharge port, the first feed port is controllably connected or disconnected with the output port, and the first injection pump is constructed to be capable of sucking the slurry from the first feed port or discharging the slurry from the first discharge port; the second injection pump is provided with a second feed port and a second discharge port, the second feed port is controllably communicated with or disconnected from the first discharge port, the second discharge port is controllably communicated with or disconnected from the die head, and the second injection pump is constructed to be capable of sucking slurry from the second feed port or discharging the slurry from the second discharge port; wherein the single-tube displacement of the first injection pump is larger than or smaller than that of the second injection pump.

Description

Technical Field

[0001] The utility model relates to the technical field of coating equipment, in particular to a feeding system and coating equipment. Background Art

[0002] Solar energy resources are abundant, green, environmentally friendly and pollution-free. It is one of the new energy sources that is expected to be widely used in the future. In the field of new solar cells, the rapid development of perovskite solar cells in recent years has received widespread attention from the scientific research community and the industrial community. In the process of preparing perovskite solar cells, it is necessary to coat a perovskite slurry on a substrate (such as glass). Due to the large coating area, thin coating, low slurry viscosity, and the need for intermittent coating, the coating process is difficult, so the feeding accuracy of the feeding system of the coating equipment is extremely high. However, the feeding accuracy of the feeding system of the coating equipment in the prior art cannot meet the process requirements of perovskite coating. Utility Model Content

[0003] Based on this, it is necessary to provide a feeding system and coating equipment that improve the above defects in order to address the problem that the feeding accuracy of the feeding system of the coating equipment in the prior art cannot meet the process requirements of perovskite coating.

[0004] A feeding system for providing slurry to a die head, the feeding system comprising:

[0005] A slurry tank, comprising a storage cavity and an output port connected to the storage cavity, wherein the storage cavity is used to store slurry, and the output port is used to output the slurry in the storage cavity;

[0006] A first injection pump having a first feed port and a first discharge port, wherein the first feed port can be controllably connected to or disconnected from the discharge port, and the first injection pump is configured to be able to suck the slurry from the first feed port or discharge the slurry from the first discharge port; and

[0007] A second injection pump has a second feed port and a second discharge port, wherein the second feed port can be controllably connected to or blocked from the first discharge port, and the second discharge port can be controllably connected to or blocked from the die head, and the second injection pump is configured to be able to suck the slurry from the second feed port or discharge the slurry from the second discharge port;

[0008] Wherein, the single-tube displacement of the first injection pump is greater than or less than the single-tube displacement of the second injection pump.

[0009] In one embodiment, the first injection pump comprises a first injection cylinder and a first injection piston, the first injection cylinder having a first end and a second end as two longitudinal ends thereof, the first injection piston being disposed in the first injection cylinder and forming a first inner cavity between the first end and the first injection piston;

[0010] The first feed port and the first discharge port are both opened in the first injection cylinder and are connected to the first inner cavity; the first injection piston can be controlled to move between the first end and the second end to suck the slurry into the first inner cavity from the first feed port, or discharge the slurry in the first inner cavity from the first discharge port.

[0011] In one embodiment, the first injection cylinder is arranged tilted relative to a horizontal plane so that the position of the first end is higher than the position of the second end;

[0012] The first injection cylinder is also provided with a first row of bubble openings communicating with the first inner cavity, and the first row of bubble openings is located at the top of the first end of the first injection cylinder.

[0013] In one embodiment, the first injection cylinder comprises a first cylindrical side wall and a first top wall and a first bottom wall covering the longitudinal ends of the first cylindrical side wall, the end of the first cylindrical side wall covering the first top wall is the first end, the end of the first cylindrical side wall covering the first bottom wall is the second end, the first injection piston is slidably matched with the first cylindrical side wall; the first cylindrical side wall, the first top wall and the first injection piston together enclose the first inner cavity;

[0014] The first discharge port is opened on the first top wall, the first feed port is opened at the bottom of one end of the first cylindrical side wall facing the first top wall, and the first row of bubble ports is opened at the top of one end of the first cylindrical side wall facing the first top wall.

[0015] In one embodiment, the slurry tank also has a return port connected to the storage chamber, the first row of bubble ports is connected to the return port through a first return pipeline, a fourth control valve is installed on the first return pipeline, and the fourth control valve is used to control the conduction or cutoff of the first return pipeline.

[0016] In one embodiment, the second injection pump comprises a second injection cylinder and a second injection piston, the second injection cylinder has a third end and a fourth end as two longitudinal ends thereof, the second injection piston is disposed in the second injection cylinder, and a second inner cavity is formed between the third end and the second injection piston;

[0017] The second feed port and the second discharge port are both opened in the second injection cylinder and communicated with the second inner cavity; the second injection piston can be controlled to move between the third end and the fourth end to suck the slurry into the second inner cavity from the second feed port, or discharge the slurry in the second inner cavity from the second discharge port.

[0018] In one embodiment, the second injection cylinder is arranged tilted relative to the horizontal plane so that the position of the third end is higher than the position of the fourth end;

[0019] The second injection cylinder is also provided with a second row of bubble openings communicating with the second inner cavity, and the second row of bubble openings is located at the top of the third end of the second injection cylinder.

[0020] In one embodiment, the second injection cylinder comprises a second cylindrical side wall and a second top wall and a second bottom wall covering the two longitudinal ends of the second cylindrical side wall, one end of the second cylindrical side wall covering the second top wall is the third end, one end of the second cylindrical side wall covering the second bottom wall is the fourth end, and the second injection piston is slidably matched with the second cylindrical side wall; the second cylindrical side wall, the second top wall and the second injection piston together enclose and form the second inner cavity;

[0021] The second discharge port is opened on the second top wall, the second feed port is opened at the bottom of one end of the second cylindrical side wall facing the second top wall, and the second row of bubble ports is opened at the top of one end of the second cylindrical side wall facing the second top wall.

[0022] In one embodiment, the slurry tank also has a return port connected to the storage chamber, the second row of bubble ports is connected to the return port through a second return pipeline, and a fifth control valve is installed on the second return pipeline, and the fifth control valve is used to control the conduction or cutoff of the second return pipeline.

[0023] In one embodiment, a first pipeline is connected between the first feed port and the output port, and a first control valve is disposed on the first pipeline. The first control valve is used to control the first pipeline to be turned on or off.

[0024] In one embodiment, a second pipeline is connected between the second feed port and the first discharge port, and a second control valve is provided on the second pipeline. The second control valve is used to control the conduction or cutoff of the second pipeline.

[0025] In one embodiment, a third pipeline is connected between the second discharge port and the die head, and a third control valve is provided on the third pipeline. The third control valve is used to control the conduction or cutoff of the third pipeline.

[0026] A coating device comprises a die head and a feeding system as described in any one of the above embodiments.

[0027] The above-mentioned feeding system and coating equipment use the first injection pump and the second injection pump with a larger single-tube displacement to perform slurry infusion and circulation at the initial start-up of the coating equipment to ensure the effect of degassing and waste discharge; when the coating equipment is shut down, use the first injection pump and the second injection pump with a larger single-tube displacement to circulate and empty the cleaning liquid to ensure the cleaning and emptying effect. When the die head is coating, the first injection pump and the second injection pump with a smaller single-tube displacement feed the die head to ensure that the feeding accuracy meets the process requirements of perovskite coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a feeding system in one embodiment of the utility model;

[0029] Figure 2 for Figure 1 A schematic structural diagram of a first injection pump of a feeding system shown;

[0030] Figure 3 for Figure 1 A schematic diagram of the structure of a second injection pump of the feeding system shown;

[0031] Figure 4 for Figure 1 A schematic diagram of the working process of the first injection pump of the feeding system is shown. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] See also Figure 1 An embodiment of the utility model provides a coating device, including a feeding system and a die head 100, wherein the feeding system is used to provide slurry to the die head 100, and the die head 100 is used to coat the slurry on a substrate, thereby coating the substrate.

[0039] It should be noted that the inventors of the present application have found in long-term practice that in the actual coating operation process, at the initial start-up of the coating equipment, slurry infusion (i.e., filling the pipeline and the die head 100 with slurry) and circulation (i.e., after the pipeline and the die head 100 are filled with slurry, the slurry circulates in the pipeline and the die head 100 for a period of time to discharge bubbles and front-end bad slurry in the pipeline and the die head 100) are required. When the coating equipment is shut down, cleaning liquid circulation (i.e., the cleaning liquid circulates in the pipeline and the die head 100) and emptying (i.e., the cleaning in the pipeline and the die head 100 is discharged). Therefore, in order to ensure the bubble and waste discharge effects at the initial start-up of the coating equipment and the cleaning and emptying effects when the coating equipment is shut down, a large-displacement injection pump is required.

[0040] When the die head 100 is coating, since the coating is thin, a slight thickness fluctuation has a great impact on the uniformity of the coating, so the feeding accuracy of the injection pump is required to be high. However, the single-tube displacement of the injection pump is inversely proportional to the feeding accuracy, that is, the larger the single-tube displacement of the injection pump, the lower the feeding accuracy; the smaller the single-tube displacement of the injection pump, the higher the feeding accuracy. Therefore, in order to ensure the feeding accuracy, a small-displacement injection pump is required.

[0041] Based on this, the inventor of the present application creatively set up a single-tube injection pump with a larger displacement and a single-tube injection pump with a smaller displacement in series in the feeding system. The single-tube injection pump with a larger displacement is used to complete the slurry infusion and circulation at the initial start-up of the coating equipment and the circulation and emptying of the cleaning liquid when the coating equipment is shut down; the single-tube injection pump with a smaller displacement is used to feed the die head 100 when the die head 100 is coating, thereby greatly improving the feeding accuracy to meet the process requirements of perovskite coating.

[0042] Please continue to see Figure 1 In an embodiment of the present application, the feeding system includes a slurry tank 10, a first injection pump 20 and a second injection pump 30. The slurry tank 10 has a storage chamber 13 and an output port 11 connected to the storage chamber 13. The storage chamber 13 is used to store slurry, and the output port 11 is used to output the slurry in the storage chamber 13. The first injection pump 20 has a first feed port a1 and a first output port a2, and the first feed port a1 can be controllably connected or disconnected with the output port 11. The first injection pump 20 is configured to be able to suck slurry from the first feed port a1 or discharge slurry from the first output port a2. The second injection pump 30 has a second feed port b1 and a second output port b2. The second feed port b1 can be controllably connected or disconnected with the first output port a2, and the second output port b2 can be controllably connected or disconnected with the die head 100. The second injection pump 30 is configured to be able to suck slurry from the second feed port b1 or discharge slurry from the second output port b2. The single-tube displacement of the first injection pump 20 is greater than the single-tube displacement of the second injection pump 30 .

[0043] In the actual use of the above-mentioned feeding system, the first injection pump 20 is used to perform slurry infusion and circulation at the initial start-up of the coating equipment: first, the first feed port a1 of the first injection pump 20 is controlled to be connected to the output port 11 of the slurry tank 10, and the first discharge port a2 of the first injection pump 20 is cut off from the second feed port b1 of the second injection pump 30. At this time, the first injection pump 20 sucks the material so that the slurry in the slurry tank 10 enters the first injection pump 20 through the output port 11 and the first feed port a1 in sequence. Then, the first feed port a1 of the first injection pump 20 is controlled to be cut off from the output port 11, the first discharge port a2 of the first injection pump 20 is connected to the second feed port b1 of the second injection pump 30, and the second discharge port b2 of the second injection pump 20 is connected to the die head 100. At this time, the first injection pump 20 discharges the material, that is, the slurry in the first injection pump 20 is discharged from the first discharge port a2, and the slurry discharged from the first discharge port a2 flows to the die head 100 through the second injection pump 30. In this reciprocating manner, the first injection pump 20 performs multiple suction and discharge actions until the slurry fills all pipelines and the die head 100, and the pre-coated coating of the die head 100 meets the requirements.

[0044] When the die head 100 is coating: first, the first feed port a1 of the first injection pump 20 is controlled to be connected to the output port 11 of the slurry tank 10, the first discharge port a2 of the first injection pump 20 is controlled to be connected to the second feed port b1 of the second injection pump 30, and the second discharge port b2 of the second injection pump 30 is disconnected from the die head 100. At this time, the second injection pump 30 sucks the material, so that the slurry in the slurry tank 10 passes through the first injection pump 20 and then enters the second injection pump 30 from the second feed port b1. Then, the first discharge port a2 of the first injection pump 20 is controlled to be disconnected from the second feed port b1 of the second injection pump 30, and the second discharge port b2 of the second injection pump 30 is connected to the die head 100. Then, the second injection pump 30 discharges the material, that is, the slurry in the second injection pump 30 is discharged from the second discharge port b2, and the slurry discharged from the second discharge port b2 flows to the die head 100. In this reciprocating manner, the second injection pump 30 performs multiple suction and discharge actions to supply material to the die head 100, so that the die head 100 can be coated.

[0045] After the coating equipment is shut down, first, the slurry in the slurry tank 10, the slurry in each pipeline and the die head 100 are emptied, and the cleaning liquid is injected into the slurry tank 10. Then, the first feed port a1 of the first injection pump 20 is controlled to be connected with the output port 11, and the first discharge port a2 of the first injection pump 20 is cut off from the second feed port b1 of the second injection pump 30. At this time, the first injection pump 20 sucks the material so that the cleaning liquid in the slurry tank 10 enters the first injection pump 20. Then, the first feed port a1 of the first injection pump 20 is controlled to be cut off from the output port 11 of the slurry tank 10, the first discharge port a2 of the first injection pump 20 is connected with the second feed port b1 of the second injection pump 30, and the second discharge port b2 of the second injection pump 30 is connected with the die head 100. At this time, the first injection pump 20 discharges the material, that is, the cleaning liquid in the second injection pump 30 is discharged from the second discharge port b2, and the cleaning liquid discharged from the second discharge port b2 flows to the die head 100. In this reciprocating motion, the second injection pump 30 performs multiple suction and discharge actions to allow the cleaning liquid in the slurry tank 10 to flow toward the die 100 until the cleaning liquid in the slurry tank 10, each pipeline and the die 100 is emptied, thereby achieving the cleaning of the slurry tank 10, each pipeline and the die 100 with the cleaning liquid.

[0046] In this way, at the initial start-up of the coating equipment, the first injection pump 20 with a large single-tube displacement is used to perform slurry infusion and circulation to ensure the effects of degassing and waste discharge; when the coating equipment is shut down, the first injection pump 20 with a large single-tube displacement is used to circulate and empty the cleaning liquid to ensure the cleaning and emptying effects. When the die head 100 is coating, the second injection pump 30 with a small single-tube displacement is used to feed the die head 100 to ensure that the feeding accuracy meets the process requirements of perovskite coating.

[0047] It should be noted that it is not limited to the case where the single-tube displacement of the first injection pump 20 is larger and the single-tube displacement of the second injection pump 30 is smaller. In other embodiments, the single-tube displacement of the first injection pump 20 is smaller than the single-tube displacement of the second injection pump 30, and the second injection pump 30 with a larger single-tube displacement is used to perform slurry infusion and degassing at the initial start-up of the coating equipment to ensure degassing and waste discharge effects; when the coating equipment is shut down, the second injection pump 30 with a larger single-tube displacement is used to circulate and drain the cleaning liquid to ensure cleaning and emptying effects. When the die head 100 is coating, the first injection pump 20 with a smaller single-tube displacement is used to feed the die head 100, which can also ensure that the feeding accuracy meets the process requirements of perovskite coating.

[0048] For ease of description, this article takes the example that the single-tube displacement of the first injection pump 20 is greater than the single-tube displacement of the second injection pump 30 for illustration.

[0049] Specifically in the embodiment, a first pipeline 40 is connected between the first feed port a1 of the first injection pump 20 and the output port 11 of the slurry tank 10. A first control valve 41 is provided on the first pipeline 40. The first control valve 41 is used to control the first pipeline 40 to be turned on or off. In this way, when the first control valve 41 controls the first pipeline 40 to be turned on, the first feed port a1 of the first injection pump 20 and the output port 11 of the slurry tank 10 are turned on through the first pipeline 40. When the first control valve 41 controls the first pipeline 40 to be turned off, the first feed port a1 of the first injection pump 20 and the output port 11 of the slurry tank 10 are not turned on (i.e., turned off). Optionally, the first control valve 41 can be a solenoid valve.

[0050] Specifically in the embodiment, a second pipeline 50 is connected between the second feed port b1 of the second injection pump 30 and the first discharge port a2 of the first injection pump 20. A second control valve 51 is provided on the second pipeline 50. The second control valve 51 is used to control the conduction or cutoff of the second pipeline 50. In this way, when the second control valve 51 controls the conduction of the second pipeline 50, the first discharge port a2 of the first injection pump 20 and the second feed port b1 of the second injection pump 30 are conducted through the second pipeline 50. When the second control valve 51 controls the cutoff of the second pipeline 50, the first discharge port a2 of the first injection pump 20 and the second feed port b1 of the second injection pump 30 are not conducted (i.e., cutoff). Optionally, the second control valve 51 can be a solenoid valve.

[0051] Specifically in the embodiment, a third pipeline 60 is connected between the second discharge port b2 of the second injection pump 30 and the die head 100. A third control valve 61 is provided on the third pipeline 60. The third control valve 61 is used to control the conduction or cutoff of the third pipeline 60. In this way, when the third control valve 61 controls the conduction of the third pipeline 60, the second discharge port b2 of the second injection pump 30 is connected to the die head 100 through the third pipeline 60. When the third control valve 61 controls the cutoff of the third pipeline 60, the second discharge port b2 of the second injection pump 30 is not connected to the die head 100 (i.e., cutoff). Optionally, the third control valve 61 can be a solenoid valve.

[0052] See also Figure 1 and Figure 2As shown, in the embodiment of the present application, the first injection pump 20 includes a first injection cylinder 21 and a first injection piston 22. The first injection cylinder 21 has a first end 211 and a second end 212 as its longitudinal ends. The first injection piston 22 is movably arranged in the first injection cylinder 21, and a first inner cavity 213 is formed between the first end 211 and the first injection piston 22. The first feed port a1 and the first discharge port a2 are both provided on the first injection cylinder 21 and communicated with the first inner cavity 213. The first injection piston 22 can be controlled to move between the first end 211 and the second end 212 to suck the slurry from the first feed port a1 into the first inner cavity 213, or to discharge the slurry in the first inner cavity 213 from the first discharge port a2. In this way, the volume of the first inner cavity 213 is changed by moving the first injection piston 22 between the first end 211 and the second end 212, thereby achieving the suction or discharge of the slurry.

[0053] It can be understood that when the first control valve 41 controls the first pipeline 40 to be turned on and the second control valve 51 controls the second pipeline 50 to be turned off, during the process of the first injection piston 22 moving from the first end 211 to the second end 212, the volume of the first inner cavity 213 gradually increases, thereby attracting the slurry in the slurry tank 10 to flow into the first inner cavity 213 through the first pipeline 40, thereby realizing the suction action of the first injection pump 20.

[0054] When the first control valve 41 controls the first pipeline 40 to be cut off, the second control valve 51 controls the second pipeline 50 to be turned on, and the third control valve 61 controls the third pipeline 60 to be turned on, during the movement of the first injection piston 22 from the second end 212 to the first end 211, the volume of the first inner cavity 213 gradually decreases, so that the slurry in the first inner cavity 213 is discharged from the first discharge port a2, and the slurry discharged from the first discharge port a2 flows to the die head 100 after passing through the second injection pump 30, that is, the discharge action of the first injection pump 20 is realized. The single-tube displacement of the first injection pump 20 refers to: during the discharge action, the first injection piston 22 moves from the second end 211 to the first end 211, and the total amount of slurry discharged from the first discharge port a2. It can be seen that the single-tube displacement of the first injection pump 20 is related to the inner diameter and length of the first injection cylinder 21. The smaller the inner diameter and the shorter the length of the first injection cylinder 21, the smaller the single-tube displacement of the first injection pump 20. The larger the inner diameter and the longer the length of the first injection cylinder 21 is, the larger the single-tube displacement of the first injection pump 20 is.

[0055] Optionally, the first injection pump 20 further includes a first driving member 23 , which is drivingly connected to the first injection piston 22 , so that the first driving member 23 can drive the first injection piston 22 to move between the first end 211 and the second end 212 .

[0056] Furthermore, the first injection cylinder 21 is arranged tilted relative to the horizontal plane, so that the first end 211 of the first injection cylinder 21 is higher than the second end 212 of the first injection cylinder 21. The first injection cylinder 21 is also provided with a first row of bubble openings a3 connected to the first inner cavity 213, and the first row of bubble openings a3 are located at the top of the first end 211 of the first injection cylinder 21. In this way, the slurry will collide with the inner wall of the first injection cylinder 21 during the suction process of the first injection pump 20 to generate bubbles, so it is necessary to remove the bubbles. See Figure 4 When the first injection pump 20 completes the material suction action, since the position of the first end 211 of the first injection cylinder 21 is higher than the position of the second end 212, the bubbles in the first inner cavity 213 will float to the top of the first end 211 of the first injection cylinder 21 (i.e., the position of the first bubble row port a3). At this time, the first injection piston 22 is controlled to move a certain distance toward the first end 211, so that the volume of the first inner cavity 213 is reduced, so that the bubbles in the first inner cavity 213 are discharged from the first bubble row port a3, that is, the bubble discharge action is completed. After the bubble discharge action is completed, the first injection pump 20 performs the material discharge action again.

[0057] It should be noted that, since the first bubble row port a3 is located at the top of the first end 211 of the first injection cylinder 21, it can ensure that all bubbles in the first inner cavity 213 are removed during bubble discharge and ensure that no bubbles enter the pipeline.

[0058] It should also be noted that when the second injection pump 30 performs the suction action, the first feed port a1 is connected to the output port 11, the first discharge port a2 is connected to the second feed port b1, and the first injection piston 22 is located at the first end 211. Since the first feed port a1 and the first discharge port a2 are both provided at the first end 211 of the first injection cylinder 21, the first inner cavity 213 between the first injection piston 22 and the first end 211 is used as a part of the flow channel when the second injection pump 30 performs the suction action, that is, the slurry in the first inner cavity 213 is flowing, thereby avoiding the phenomenon that the slurry in the first inner cavity 213 is solidified or crystallized due to non-flow.

[0059] Please continue to see Figure 2 Optionally, the first injection cylinder 21 includes a first cylindrical side wall 214 and a first top wall 215 and a first bottom wall 216 covered on the first cylindrical side wall 214. One end of the first cylindrical side wall 214 covered with the first top wall 215 is the above-mentioned first end 211, and one end of the first cylindrical side wall 214 covered with the first bottom wall 216 is the above-mentioned second end 212. The first injection piston 22 is slidably matched with the first cylindrical side wall 214, so that the first injection piston 22 can move between the first end 211 and the second end 212. The first cylindrical side wall 214, the first top wall 215 and the first injection piston 22 together enclose the above-mentioned first inner cavity 213.

[0060] The first discharge port a2 is opened on the first top wall 215 , the first feed port a1 is opened at the bottom of one end of the first cylindrical side wall 214 facing the first top wall 215 , and the first row of bubble ports a3 is opened at the top of one end of the first cylindrical side wall 214 facing the first top wall 215 .

[0061] See also Figure 1 Furthermore, the slurry tank 10 also has a return port 12 connected to the storage chamber 13, and the first row of bubble ports a3 is connected to the return port 12 through the first return pipe 70. The first return pipe 70 is equipped with a fourth control valve 71, which is used to control the first return pipe 70 to be turned on or off. That is to say, when the fourth control valve 71 controls the first return pipe 70 to be turned on, the first row of bubble ports a3 is connected to the return port 12 on the slurry tank 10 through the first return pipe 70, so as to facilitate the discharge of bubbles (see Figure 4 As shown in the figure, the bubbles and slurry discharged from the first row of bubble ports a3 flow into the storage chamber 13 in the slurry tank 10 through the first return line 70.

[0062] It should be noted that when the first injection pump 20 performs suction and discharge operations, the fourth control valve 71 is required to control the first return pipe 70 to be in a closed state. When the first injection pump 20 performs bubble discharge operations, the fourth control valve 71 is required to control the first return pipe 70 to be in a conducting state.

[0063] See also Figure 1 and Figure 3 As shown, in the embodiment of the present application, the second injection pump 30 includes a second injection cylinder 31 and a second injection piston 32. The second injection cylinder 31 has a third end 311 and a fourth end 312 as its longitudinal ends. The second injection piston 32 is movably arranged in the second injection cylinder 31, and a second inner cavity 313 is formed between the third end 311 and the second injection piston 32. The second feed port b1 and the second discharge port b2 are both provided on the second injection cylinder 31 and communicated with the second inner cavity 313. The second injection piston 32 can be controlled to move between the third end 311 and the fourth end 312 to suck the slurry from the second feed port b1 into the second inner cavity 313, or to discharge the slurry in the second inner cavity 313 from the second discharge port b2. In this way, the volume of the second inner cavity 313 is changed by the movement of the second injection piston 32 between the third end 311 and the fourth end 312, so as to achieve the suction or discharge of the slurry.

[0064] It can be understood that when the first control valve 41 controls the first pipeline 40 to be turned on, the second control valve 51 controls the second pipeline 50 to be turned off, and the third control valve 61 controls the third pipeline 60 to be turned off, during the process of the second injection piston 32 moving from the third end 311 to the fourth end 312, the volume of the second inner cavity 313 gradually increases, thereby attracting the slurry in the slurry tank 10 to flow into the second inner cavity 313 through the first pipeline 40, the first injection pump 20 and the second pipeline 50, thereby realizing the suction action of the second injection pump 30.

[0065] When the second control valve 51 controls the second pipeline 50 to be cut off, and the third control valve 61 controls the third pipeline 60 to be turned on, during the movement of the second injection piston 32 from the fourth end 312 to the third end 311, the volume of the second inner cavity 313 gradually decreases, so that the slurry in the second inner cavity 313 is discharged from the second discharge port b2, and the slurry discharged from the second discharge port b2 flows to the die head 100 through the third pipeline 60, that is, the discharge action of the second injection pump 30 is realized. The single-tube displacement of the second injection pump 30 refers to: during the discharge action, the second injection piston 32 moves from the fourth end 312 to the third end 311, and the total amount of slurry discharged from the second discharge port b2. It can be seen that the single-tube displacement of the second injection pump 30 is related to the inner diameter and length of the second injection cylinder 31. The smaller the inner diameter and the shorter the length of the second injection cylinder 31, the smaller the single-tube displacement of the second injection pump 30. The larger the inner diameter and the longer the length of the second syringe 31 , the greater the single-tube displacement of the second syringe pump 30 .

[0066] Optionally, the second injection pump 30 further includes a second driving member 33 , which is drivingly connected to the second injection piston 32 , so that the second driving member 33 can drive the second injection piston 32 to move between the third end 311 and the fourth end 312 in the second injection cylinder 31 .

[0067] Further, the second syringe 31 is arranged tilted relative to the horizontal plane so that the position of the third end 311 of the second syringe 31 is higher than the position of the fourth end 312 of the second syringe 31. The second syringe 31 is also provided with a second row of bubble openings b3 connected to the second inner cavity 313, and the second row of bubble openings b3 are located at the top of the third end 311 of the second syringe 31. In this way, during the suction process of the second syringe pump 30, the slurry will collide with the inner wall of the second syringe 31 to generate bubbles, and thus it is necessary to discharge bubbles. When the second syringe pump 30 completes the suction action, since the position of the third end 311 of the second syringe 31 is higher than the position of the fourth end 312, the bubbles in the second inner cavity 313 will float to the top of the third end 311 of the second syringe 31 (i.e., the position of the second row of bubble openings b3), and at this time, the second injection piston 32 is controlled to move a certain distance toward the third end 311, so that the volume of the second inner cavity 313 is reduced, so that the bubbles in the second inner cavity 313 are discharged from the second row of bubble openings b3, that is, the bubble discharge action is completed. After completing the bubble discharge action, the second injection pump 30 performs the material discharge action.

[0068] It should be noted that since the second bubble row port b3 is located at the top of the third end 311 of the second syringe 31, it is possible to ensure that all bubbles in the second inner cavity 313 are removed during bubble discharge. On the one hand, it is ensured that no bubbles enter the pipeline; on the other hand, it is ensured that the feeding accuracy of the second injection pump 30 is not adversely affected due to residual bubbles in the second inner cavity 313.

[0069] It should also be noted that when the first injection pump 20 performs the discharge action, the first discharge port a2 is connected to the second feed port b1, the second discharge port b2 is connected to the die head 100, and the second injection piston 32 is located at the third end 311. Since the second feed port b1 and the second discharge port b2 are both provided at the third end 311 of the second syringe 31, the second inner cavity 313 between the second injection piston 32 and the third end 311 is used as a part of the flow channel when the first injection pump 20 performs the discharge action, that is, the slurry in the second inner cavity 313 is flowing, thereby preventing the slurry in the second inner cavity 313 from solidifying or crystallizing due to non-flow.

[0070] Optionally, the second injection cylinder 31 includes a second cylindrical side wall 314 and a second top wall 315 and a second bottom wall 316 covered on the second cylindrical side wall 314. One end of the second cylindrical side wall 314 covered with the second top wall 315 is the third end 311, and one end of the second cylindrical side wall 314 covered with the second bottom wall 316 is the fourth end 312. The second injection piston 32 is slidably matched with the second cylindrical side wall 314, so that the second injection piston 32 can move between the third end 311 and the fourth end 312. The second cylindrical side wall 314, the second top wall 315 and the second injection piston 32 together enclose the second inner cavity 313.

[0071] The second discharge port b2 is opened on the second top wall 315 , the second feed port b1 is opened at the bottom of one end of the second cylindrical side wall 314 facing the second top wall 315 , and the second row of bubble ports b3 is opened at the top of one end of the second cylindrical side wall 314 facing the second top wall 315 .

[0072] Furthermore, the second row of bubble ports b3 is connected to the second return line 80 (see Figure 1 ) and the return port 12 on the slurry tank 10 (see Figure 1 The second return line 80 is connected with a fifth control valve 81 (see Figure 1 ). The fifth control valve 81 is used to control the conduction or cutoff of the second return pipe 80. That is, when the fifth control valve 81 controls the conduction of the second return pipe 80, the second bubble row port b3 is connected to the return port 12 on the slurry tank 10 through the second return pipe 80, so that the bubbles and slurry discharged from the second bubble row port b3 during bubble discharge flow into the storage chamber 13 in the slurry tank 10 through the second return pipe 80.

[0073] It should be noted that when the second injection pump 30 performs suction and discharge operations, the fifth control valve 81 is required to control the second return pipe 80 to be in a closed state. When the second injection pump 30 performs bubble discharge operations, the fifth control valve 81 is required to control the second return pipe 80 to be in a conducting state.

[0074] It should be noted that, in actual use, the first injection pump 20 performs the material suction action, the bubble discharge action and the material discharge action in sequence. Figure 4 The material suction action, bubble discharge action, and material discharge action of the first syringe pump 20 are described.

[0075] Suction action: First, the first control valve 41 controls the first pipeline 40 to be turned on, the second control valve 51 controls the second pipeline 50 to be turned off, and the fourth control valve 71 controls the first return pipeline 70 to be turned off. Then, the first injection piston 22 moves from left to right in the first injection cylinder 21, so that the volume of the first inner cavity 213 gradually increases, thereby sucking the slurry into the first inner cavity 213 from the first feed port a1 until the first injection piston 22 moves to the right end of the first injection cylinder 21.

[0076] Bubble discharge action: First, the first control valve 41 controls the first pipeline 40 to be cut off, the second control valve 51 controls the second pipeline 50 to be cut off, and the fourth control valve 71 controls the first return pipeline 70 to be turned on. Then, the first injection piston 22 moves to the left, so that the volume of the first inner cavity 213 gradually decreases until all bubbles in the first inner cavity 213 flow back to the storage cavity 13 of the slurry tank 10 through the first bubble discharge port a3, the first return pipeline 70 and the return port 12 in sequence.

[0077] Discharging action: First, the first control valve 41 controls the first pipeline 40 to be cut off, the second control valve 51 controls the second pipeline 50 to be turned on, and the fourth control valve 71 controls the first return pipeline 70 to be cut off. Then, the first injection piston 22 moves to the left, so that the volume of the first inner cavity 213 gradually decreases, so that the slurry in the first inner cavity 213 is discharged from the first discharge port a2 until the first injection piston 22 moves to the left end of the first injection cylinder 21. At this time, there is a certain distance between the first injection piston 22 and the first top wall 215, so that a channel for the slurry to flow downstream is formed between the first injection piston 22 and the first top wall 215.

[0078] It should be noted that, in actual use, the second injection pump 30 also performs the suction action, bubble removal action and material discharge action in sequence in a cyclic manner, and the suction action, bubble removal action and material discharge action of the second injection pump 30 are similar to those of the first injection pump 20, so they will not be described in detail here.

[0079] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A feeding system for providing slurry to a die head, characterized in that: The feeding system comprises: A slurry tank, comprising a storage cavity and an output port connected to the storage cavity, wherein the storage cavity is used to store slurry, and the output port is used to output the slurry in the storage cavity; A first injection pump having a first feed port and a first discharge port, wherein the first feed port can be controllably connected to or disconnected from the discharge port, and the first injection pump is configured to be able to suck the slurry from the first feed port or discharge the slurry from the first discharge port; and A second injection pump has a second feed port and a second discharge port, wherein the second feed port can be controllably connected to or blocked from the first discharge port, and the second discharge port can be controllably connected to or blocked from the die head, and the second injection pump is configured to be able to suck the slurry from the second feed port or discharge the slurry from the second discharge port; Wherein, the single-tube displacement of the first injection pump is greater than or less than the single-tube displacement of the second injection pump.

2. The feeding system according to claim 1, characterized in that: The first injection pump comprises a first injection cylinder and a first injection piston, wherein the first injection cylinder has a first end and a second end as two longitudinal ends thereof, and the first injection piston is disposed in the first injection cylinder, and a first inner cavity is formed between the first end and the first injection piston; The first feed port and the first discharge port are both opened in the first injection cylinder and are connected to the first inner cavity; the first injection piston can be controlled to move between the first end and the second end to suck the slurry into the first inner cavity from the first feed port, or discharge the slurry in the first inner cavity from the first discharge port.

3. The feeding system according to claim 2, characterized in that: The first injection cylinder is arranged tilted relative to a horizontal plane so that the position of the first end is higher than the position of the second end; The first injection cylinder is also provided with a first row of bubble openings communicating with the first inner cavity, and the first row of bubble openings is located at the top of the first end of the first injection cylinder.

4. The feeding system according to claim 3, characterized in that: The first injection cylinder comprises a first cylindrical side wall and a first top wall and a first bottom wall covering the longitudinal ends of the first cylindrical side wall, the end of the first cylindrical side wall covering the first top wall is the first end, the end of the first cylindrical side wall covering the first bottom wall is the second end, the first injection piston is slidably matched with the first cylindrical side wall; the first cylindrical side wall, the first top wall and the first injection piston jointly enclose the first inner cavity; The first discharge port is opened on the first top wall, the first feed port is opened at the bottom of one end of the first cylindrical side wall facing the first top wall, and the first row of bubble ports is opened at the top of one end of the first cylindrical side wall facing the first top wall.

5. The feeding system according to claim 3, characterized in that: The slurry tank also has a return port connected to the storage chamber. The first row of bubble ports is connected to the return port through a first return pipeline. A fourth control valve is installed on the first return pipeline. The fourth control valve is used to control the conduction or cutoff of the first return pipeline.

6. The feeding system according to claim 1, characterized in that: The second injection pump comprises a second injection cylinder and a second injection piston, the second injection cylinder has a third end and a fourth end as two longitudinal ends thereof, the second injection piston is disposed in the second injection cylinder, and a second inner cavity is formed between the third end and the second injection piston; The second feed port and the second discharge port are both opened in the second injection cylinder and communicated with the second inner cavity; the second injection piston can be controlled to move between the third end and the fourth end to suck the slurry into the second inner cavity from the second feed port, or discharge the slurry in the second inner cavity from the second discharge port.

7. The feeding system according to claim 6, characterized in that: The second injection cylinder is arranged tilted relative to the horizontal plane so that the position of the third end is higher than the position of the fourth end; The second injection cylinder is also provided with a second row of bubble openings communicating with the second inner cavity, and the second row of bubble openings is located at the top of the third end of the second injection cylinder.

8. The feeding system according to claim 7, characterized in that: The second injection cylinder comprises a second cylindrical side wall and a second top wall and a second bottom wall covering the longitudinal ends of the second cylindrical side wall, one end of the second cylindrical side wall covering the second top wall is the third end, one end of the second cylindrical side wall covering the second bottom wall is the fourth end, the second injection piston is slidably matched with the second cylindrical side wall; the second cylindrical side wall, the second top wall and the second injection piston jointly enclose and form the second inner cavity; The second discharge port is opened on the second top wall, the second feed port is opened at the bottom of one end of the second cylindrical side wall facing the second top wall, and the second row of bubble ports is opened at the top of one end of the second cylindrical side wall facing the second top wall.

9. The feeding system according to claim 7, characterized in that: The slurry tank also has a return port connected to the storage chamber, the second row of bubble ports is connected to the return port through a second return pipeline, a fifth control valve is installed on the second return pipeline, and the fifth control valve is used to control the conduction or cutoff of the second return pipeline.

10. The feeding system according to any one of claims 1 to 9, characterized in that: A first pipeline is connected between the first feed port and the output port, and a first control valve is arranged on the first pipeline. The first control valve is used to control the first pipeline to be turned on or off.

11. The feeding system according to any one of claims 1 to 9, characterized in that: A second pipeline is connected between the second feed port and the first discharge port, and a second control valve is arranged on the second pipeline. The second control valve is used to control the conduction or cutoff of the second pipeline.

12. The feeding system according to any one of claims 1 to 9, characterized in that: A third pipeline is connected between the second discharge port and the die head, and a third control valve is arranged on the third pipeline. The third control valve is used to control the conduction or cutoff of the third pipeline.

13. A coating device, characterized in that: It comprises a die head and a feeding system as claimed in any one of claims 1 to 12.

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