An air flotation coating machine

Abstract

The invention relates to the technical field of coating equipment, and specifically provides an air flotation coating machine, comprising a frame, a workbench and a sliding coating die head are arranged on the frame, a cavity is provided inside the coating die head, a plurality of wavy guide plates are arranged in the cavity, so that when the coating liquid flows through the wave crests on the plurality of wavy guide plates, the space through which the coating liquid flows vertically becomes narrower, thereby reducing the flow speed, so that the coating liquid can spread in the length direction of the coating die head, and the degree of synchronization of the coating liquid when it flows vertically downward is improved, which can ensure that the gas at the discharge port is completely discharged to avoid the occurrence of bubbles in the liquid, and at the same time can improve the uniformity of the coating liquid at the discharge port position, thereby improving the coating effect, and a mixing component is arranged in the cavity, and the mixing component can mix the coating liquid between the feed port and the discharge port at the beginning or end of coating, thereby avoiding affecting the next start-up and use of the coating machine.

Description

Technical Field

[0001] The invention relates to the technical field of coating equipment, in particular to an air flotation coating machine. Background Art

[0002] The air-floating coating machine can coat the slurry on the surface of the substrate when preparing solar cells. In order to improve the coating accuracy and reduce the accuracy error caused by the vibration between the mechanical structures and the error of the start and stop positions, the guide rail system generally adopts an air-floating guide rail to maximize the stability of the device and the processing accuracy. For example, Chinese patent CN117920525A discloses an air-floating flat plate slit coating device, which includes a frame unit and an air-floating movable die head unit, wherein the air-floating movable die head unit is suspended on the frame unit, the frame unit includes an upper platform frame assembly and a lower frame assembly, the upper platform frame assembly includes a marble platform and a machine bottom plate, the lower frame assembly includes a machine and a machine side plate, the air-floating movable die head unit includes a die head movable frame assembly and a die head, and the die head movable frame assembly includes a die head lifting base assembly and a lifting slide assembly. This solution improves the stability and consistency of the whole machine by adopting a floating suspended translational die head, and at the same time, it is more stable and runs at a high speed while achieving nanometer-level precision.

[0003] During use, the existing coating machine will have different pressures of the coating liquid in the slit, causing the coating liquid to flow and distribute unevenly in the slit, making it impossible to completely discharge the gas in the slit, resulting in bubbles in the coating liquid, affecting the coating accuracy and the next use of the coating machine. Summary of the invention

[0004] Based on this, it is necessary to provide an air flotation coating machine to address the problem that the current coating liquid contains bubbles, which affects the coating accuracy, and the coating liquid in the die head will settle to a certain extent when the coating machine is shut down for maintenance.

[0005] The above purpose is achieved through the following technical solutions:

[0006] An air flotation coating machine, comprising:

[0007] A frame, on which a mechanical arm and a workbench are arranged, and the mechanical arm can place the plate to be processed on the workbench;

[0008] A coating die head is slidably arranged on the frame, and a feed inlet and a discharge outlet are provided on the coating die head. The coating die head slides through the workbench and can extrude the coating liquid from the discharge outlet to cover the surface of the plate to be processed;

[0009] The coating die head has a cavity inside, the cavity is connected to the feed port and the discharge port, a plurality of vertically arranged wavy guide plates are fixed in the cavity, the plurality of wavy guide plates are arranged in rows and at intervals, and the crests and troughs of adjacent wavy guide plates are arranged in a staggered manner;

[0010] A mixing assembly, the mixing assembly comprising two sliding plates, the two sliding plates are symmetrically and vertically arranged on the side walls in the cavity, a connecting groove is opened on the side walls corresponding to the two sliding plates, the two ends of the connecting groove are respectively close to the feed port and the discharge port, the two sliding plates can slide in the vertical direction to open or block the connecting groove, and the two sliding plates are configured as follows:

[0011] When the coating liquid starts to be input into the feed port, the two sliding plates gradually move vertically downward to block the connecting groove, and the coating liquid can first pass through the connecting groove and then pass between the two sliding plates;

[0012] When the feed port stops inputting the coating liquid, the two sliding plates are reset vertically upward to reopen the connecting groove;

[0013] An elastic plate is arranged between the two sliding plates, the elastic plate is wavy, one end of the elastic plate is connected to the bottom of a plurality of wavy guide plates, and the other end of the elastic plate is connected to the two sliding plates at the same time. When the two sliding plates move in the vertical direction, the elastic plate can drive the elastic plate to expand and contract. When the elastic plate expands and contracts, the wave crests on its two surfaces can be separated from or abutted against the ends of the two sliding plates that are close to each other.

[0014] The two sliding plates have a first state and a second state when they are reset vertically upward;

[0015] When the two sliding plates are in the first state, the wave peaks on the two surfaces of the elastic plate abut against the ends of the two sliding plates that are close to each other, the two sliding plates block the connecting groove, and the chamber near the discharge port is in a negative pressure state;

[0016] When the two sliding plates are in the second state, the wave peaks on the two surfaces of the elastic plate abut against one end of the two sliding plates close to each other, the two sliding plates open the connecting groove, and the chamber close to the feed port is in a positive pressure state.

[0017] Furthermore, the two sliding plates are respectively connected with elastic members.

[0018] Furthermore, the elastic member is a spring.

[0019] Furthermore, the coating die head includes a first template and a second template, the first template is provided with a first groove, the second template is provided with a second groove, the first template and the second template are fitted to each other, and the first groove and the second groove form the cavity.

[0020] Furthermore, a pad is provided between the first template and the second template.

[0021] Furthermore, an automatic closing switch is provided at the discharge port, and the automatic closing switch blocks the discharge port in an initial state, and opens the discharge port when the automatic closing switch is pushed by the coating liquid.

[0022] Furthermore, the automatic closing switch includes a sealing plate and a connecting shaft. A fan-shaped groove is provided on the inner wall of the discharge port. The connecting shaft is fixed at the center of the fan-shaped groove. The sealing plate is rotatably connected to the connecting shaft. A torsion spring is provided at the rotating connection of the sealing plate, and the torsion spring can push the sealing plate to seal the discharge port.

[0023] Furthermore, the frame is symmetrically provided with slide rails, the slide rails are arranged horizontally, and the coating die head slides along the slide rails.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a plurality of wavy guide plates so that when the coating liquid flows through the wave crests on the plurality of wavy guide plates, the space through which the coating liquid flows vertically becomes narrower, thereby reducing the flow velocity, allowing the coating liquid to spread in the length direction of the coating die head, thereby improving the degree of synchronization of the coating liquid when it flows vertically downward, ensuring that the gas at the discharge port is completely discharged to avoid the occurrence of bubbles in the liquid, and also improving the uniformity of the coating liquid at the discharge port, thereby improving the coating effect.

[0026] The present invention arranges a mixing component in the cavity, and the mixing component can mix the coating liquid between the feed port and the discharge port at the beginning or end of coating, thereby avoiding the sedimentation of the coating liquid in the coating die head when the coating machine is shut down for maintenance, thereby avoiding affecting the next start-up of the coating machine.

[0027] The present invention provides an elastic plate, and the elastic plate is also wavy. The wave peaks on the two surfaces of the elastic plate can abut against the sides of the two sliding plates that are close to each other, so that the two sliding plates can suck the coating liquid on the outside of the discharge port into the inside of the discharge port when moving vertically upward, reducing the contact between the coating liquid and the outside air when the coating die head is reset, thus saving the operation of scraping off the coating liquid on the outside of the discharge port each time the coating die head is reset, thereby improving the coating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of an air flotation coating machine provided in one embodiment of the present invention;

[0029] Figure 2A schematic diagram of the coating die structure of an air flotation coating machine provided in one embodiment of the present invention;

[0030] Figure 3 for Figure 2 An exploded view of a coating die head of an air flotation coating machine provided in one embodiment;

[0031] Figure 4 for Figure 3 A partial enlarged view of part X of the air flotation coating machine provided in one embodiment;

[0032] Figure 5 for Figure 2 A front view of a coating die head of an air flotation coating machine provided in one embodiment;

[0033] Figure 6 for Figure 5 A cross-sectional view of a coating die head of an air flotation coating machine provided in one embodiment along AA;

[0034] Figure 7 for Figure 6 A partial enlarged view of the Y portion when the coating die head of the air flotation coating machine provided in one embodiment is conveying the coating liquid;

[0035] Figure 8 for Figure 6 A partial enlarged view of a first state Y portion when a coating die head of an air flotation coating machine provided in an embodiment stops conveying a coating liquid;

[0036] Fig. 9 for Figure 6 A partial enlarged view of part Y of the second state when the coating die head of the air flotation coating machine provided in one embodiment stops conveying the coating liquid.

[0037] in:

[0038] 100, rack; 110, mechanical arm; 120, workbench; 130, slide rail;

[0039] 200, coating die head; 201, feed port; 202, discharge port; 210, first template; 211, first groove; 212, fan-shaped groove; 213, blocking plate; 214, connecting shaft; 220, second template; 221, second groove; 230, cavity; 240, connecting groove; 250, wavy guide plate; 251, fixing rod; 252, fixing block; 260, fixing plate; 270, elastic plate; 271, connecting rod; 280, sliding plate; 281, arc groove; 282, elastic member; 290, pad;

[0040] 300. Board materials. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In the present invention, 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.

[0044] Refer to the following Figure 1-Figure 9 To describe an air flotation coating machine provided by the present invention.

[0045] A flotation coating machine is suitable for thin-layer coating on the surface of a plate 300 to be processed, comprising a frame 100. Two robotic arms 110 are arranged on both sides of the frame 100. The two robotic arms 110 can transport the plate 300 to be processed. A workbench 120 is also arranged on the frame 100. One of the two robotic arms 110 is used to transport the plate 300 to be processed to the workbench 120 for coating, and the other robotic arm 110 is used to take the coated plate 300 out of the workbench 120 and transport it to other areas.

[0046] A coating die head 200 is slidably arranged on the frame 100, and a feed port 201 and a discharge port 202 are provided on the coating die head 200. The feed port 201 is used to input the coating liquid. A coating liquid conveyor (not shown in the figure) is arranged on one side of the frame 100, and the coating liquid conveyor is connected to the feed port 201, and the discharge port 202 is used to output the coating liquid. The length of the coating die head 200 is the same as the width of the plate 300 to be processed. The discharge port 202 of the coating die head 200 is a rectangular slit, and the length of the rectangular slit is the same as the width of the plate 300 to be processed, so that the input coating liquid can be output in the width size of the plate 300 to be processed. At the same time, the coating die head 200 slides slowly horizontally across the workbench 120, so that the coating liquid can be evenly coated on the surface of the plate 300 to be added on the workbench 120.

[0047] The coating die head 200 has a cavity 230 inside, the cavity 230 is connected to the feed port 201 and the discharge port 202, and a plurality of vertically arranged wave-shaped guide plates 250 are fixed in the cavity 230. Figure 3 , Figure 4 and Figure 7 As shown, a plurality of wavy guide plates 250 are evenly arranged in a row, the spacing between the plurality of wavy guide plates 250 is the same, and the crests and troughs on adjacent wavy guide plates 250 are staggered, that is, the crests (troughs) of one wavy guide plate 250 correspond to the troughs (peaks) of another adjacent guide plate, so that the coating liquid entering from the feed port 201 passes through a plurality of wavy guide plates 250 and is squeezed out from the discharge port 202.

[0048] It can be understood that when the coating liquid flows through the crests on several wavy guide plates 250, the space through which the coating liquid flows vertically becomes narrower, thereby reducing the flow speed, allowing the coating liquid to spread in the length direction of the coating die 200. There are troughs on both sides of the crests. When the coating liquid flows vertically downward through the crests, it will flow in the direction of the troughs on both sides, and there are crests below the troughs, which improves the uniformity of the coating liquid in the length direction of the coating die 200, and passes through multiple staggered crests, thereby improving the degree of synchronization of the coating liquid when it flows vertically downward. That is to say, the coating liquid moves vertically downward at the same flow rate as much as possible, and the overall flow is in parallel, which can ensure that the gas at the outlet 202 is completely discharged and avoid the appearance of bubbles in the liquid, and at the same time, it can also improve the uniformity of the coating liquid at the outlet 202, thereby improving the coating effect.

[0049] A mixing component is also provided in the cavity 230, which can mix the coating liquid between the feed port 201 and the discharge port 202 at the beginning or end of coating, thereby avoiding sedimentation of the coating liquid in the coating die head 200 when the coating machine is shut down or repaired, thereby avoiding affecting the next start-up of the coating machine.

[0050] It should be noted that, in order to facilitate the fixed connection of a plurality of wavy guide plates 250, as shown in FIG. Figure 4 and Figure 7 As shown, two fixing rods 251 are connected in the cavity 230, and both ends of the two fixing rods 251 are fixed in the cavity 230 by fixing blocks 252. The two fixing rods 251 are parallel to each other and distributed along the length direction of the coating die 200. The upper ends of several wavy guide plates 250 are respectively fixed on the two fixing rods 251 to play a role of fixed connection. In order to make the several wavy guide plates 250 tightly connected, a fixing plate 260 is fixedly connected to the lower ends of the several wavy guide plates 250, and both ends of the fixing plate 260 are also connected in the cavity 230 by fixing blocks 252.

[0051] Specifically, the mixing assembly of the present invention includes two sliding plates 280, which are vertically arranged on two symmetrical side walls in the cavity 230, and the two ends of the two sliding plates 280 are slidably abutted against the other two side walls. A connecting groove 240 is opened on the two side walls corresponding to the two sliding plates 280, and the two openings of the connecting groove 240 are respectively close to the feed port 201 and the discharge port 202. The two sliding plates 280 can slide in the vertical direction to open or close the connecting groove 240. When the coating liquid is not initially transported into the feed port 201, the two sliding plates 280 are located above the opening of the connecting groove 240 near one end of the discharge port 202, that is, the two sliding plates 280 open the connecting groove 240. When the coating liquid begins to be transported into the feed port 201, the two sliding plates 280 will gradually begin to move vertically downward under the action of the vertical downward flow of the coating liquid, and the two sliding plates 280 gradually block the connecting groove 240. Before blocking, part of the coating liquid will flow from the feed port 201 to the discharge port 202 through the connecting groove 240. After blocking, the coating liquid cannot enter the connecting groove 240, and the coating liquid enters the discharge port 202 through the two sliding plates 280.

[0052] When the coating liquid stops being conveyed, the two sliding plates 280 are gradually moved vertically upward through other elastic elements and reset. When resetting, the two sliding plates 280 gradually open the connecting groove 240. After opening the connecting groove 240, part of the coating liquid near the feed port 201 will enter the connecting groove 240 under the action of the resetting of the two sliding plates 280, and enter the position near the discharge port 202 through the connecting groove 240, so that when the coating operation stops, part of the coating liquid at the feed port 201 will flow to the discharge port 202; and when the coating operation starts again, that is, when the coating liquid continues to be conveyed to the feed port 201, part of the coating liquid near the feed port 201 enters the position near the discharge port 202 through the connecting groove 240. The coating liquid in the connecting groove 240 has a certain impact force when entering there, which can impact the coating liquid that is prone to sedimentation there, effectively alleviating the sedimentation problem of the coating liquid there, and avoiding affecting the coating effect.

[0053] In a further embodiment, in order to achieve the above functions and solve the problem that when coating is stopped, part of the coating liquid will adhere to the discharge port 202 due to the tension of the liquid, and when the coating is stopped for a long time, these coating liquids will absorb a large amount of dust and other impurities in the air. Therefore, each time the coating liquid is re-delivered, this part of the coating liquid needs to be scraped off, resulting in a decrease in coating efficiency, an elastic plate 270 is provided between the ends of the two sliding plates 280 that are close to each other, and the elastic plate 270 is also a wave The upper end of the elastic plate 270 is fixedly connected to the lower ends of several wavy guide plates 250, that is, fixedly connected to the fixed plate 260, and the lower end of the elastic plate 270 is fixedly connected to the lower ends of two sliding plates 280 at the same time, specifically, fixedly connected by a plurality of connecting rods 271, and one end of the two sliding plates 280 close to each other is provided with an arc groove 281 that can adapt to the wavy elastic plate 270, so as to facilitate the abutment between the wave peaks on the two surfaces of the elastic plate 270 and the two sliding plates 280.

[0054] When the elastic plate 270 is in the initial state, that is, when the coating liquid is not started to be transported, the peaks of the two surfaces of the elastic plate 270 respectively abut against the ends of the two sliding plates 280 that are close to each other. The length of the elastic plate 270 is the same as the length of the two sliding plates 280. Therefore, when the elastic plate 270 abuts against the two sliding plates 280, it can block the coating liquid from passing through the two sliding plates 280, which is equivalent to a switch. With the continuous input of the coating liquid, the coating liquid gradually pushes the two sliding plates 280 to slide vertically downward. The two sliding plates 280 pull the lower end of the elastic plate 270 to move downward, thereby lengthening the elastic plate 270. The peaks of the two surfaces of the elastic plate 270 gradually separate from the two sliding plates 280, thereby opening the space between the two sliding plates 280, so that the coating liquid can pass through the two sliding plates 280 into the discharge port 202.

[0055] When the two sliding plates 280 gradually return vertically upward, they have a first state and a second state. In the first state, the two sliding plates 280 do not open the connecting groove 240. The specific state is as follows: Figure 8 As shown, the two sliding plates 280 gradually move vertically upward to reset and are in the first state, the elastic plate 270 between the two sliding plates 280 also gradually resets and the wave peaks on the two surfaces have abutted against the ends of the two sliding plates 280 that are close to each other, so that the chamber near the discharge port 202 forms a sealed chamber, and as the two sliding plates 280 continue to reset vertically upward, the formed sealed chamber is gradually in a negative pressure state, so that the coating liquid on the outside of the discharge port 202 can flow back into the cavity 230, that is, the coating liquid remaining on the outside of the discharge port 202 moves upward and enters the inside of the discharge port 202, avoiding excessive contact between the coating liquid and the outside air.

[0056] It can be understood that when the coating liquid moves vertically upward in the discharge port 202, it can not only avoid excessive contact between the coating liquid and the outside air, but also save the step of scraping off the coating liquid remaining on the outside of the discharge port 202 each time the coating liquid is re-delivered, thereby improving the efficiency of the coating operation.

[0057] In the second state, the two sliding plates 280 open the connecting groove 240. Fig. 9 As shown, the chamber near the feed port 201 is in a positive pressure state. At this time, the connecting groove 240 is opened, and part of the coating liquid near the feed port 201 enters the chamber near the discharge port 202 through the connecting groove 240 and mixes with part of the coating liquid in the discharge port 202.

[0058] More specifically, in order to enable the two sliding plates 280 to move vertically upward and reset, elastic members 282 are fixedly connected at both ends of the two sliding plates 280. The elastic members 282 are components such as springs that have elastic deformation and reset functions. The other end of the elastic member 282 is fixedly set in the cavity 230. When the coating liquid is conveyed, the coating liquid will gradually push the two sliding plates 280 to move vertically downward to compress the elastic member 282. When the coating liquid is stopped, the elastic member 282 will release the elastic force to push the two sliding plates 280 to move vertically upward to reset.

[0059] In a further embodiment, the coating die head 200 of the present invention includes a first template 210 and a second template 220, the first template 210 is provided with a first groove 211, the second template 220 is provided with a second groove 221, the first template 210 and the second template 220 are close to each other and fit together to form a whole, the positions of the first groove 211 and the second groove 221 correspond to each other to form a cavity 230, and the connecting groove 240 in the cavity 230 is provided on the bottom of the first groove 211 and the second groove 221, and the two connecting grooves 240 and the two sliding plates 280 are also symmetrically arranged, as shown in FIG. Figure 7 shown.

[0060] Specifically, a pad 290 is arranged between the first template 210 and the second template 220. The pad 290 is used to form a rectangular slit below the first template 210 and the second template 220, that is, to form a discharge port 202. The pad 290 is tightly fitted to the upper ends of the first template 210 and the second template 220, and the feed port 201 is connected to the bottom of the first groove 211 and the second groove 221. The present invention has two feed ports 201, which can improve the feeding efficiency.

[0061] In a further embodiment, an automatic closing switch is provided inside the discharge port 202, and the automatic closing switch can open the discharge port 202 when the coating liquid is input, and can close the discharge port 202 when the coating liquid is stopped.

[0062] Specifically, the automatic closing switch in this embodiment includes a blocking plate 213 and a connecting shaft 214. A fan-shaped groove 212 is provided on the inner wall of the discharge port 202, that is, the fan-shaped groove 212 is provided on the first template 210. The center of the fan-shaped groove 212 is away from the side wall of the discharge port 202, and the arc of the fan-shaped groove 212 is close to the side wall of the discharge port 202. The connecting shaft 214 is fixedly arranged at the center of the fan-shaped groove 212, and the blocking plate 213 is rotatably connected to the connecting shaft 214. A torsion spring (not shown in the figure) is arranged on the connecting shaft 214. One end of the torsion spring is fixedly connected to the connecting shaft 214, and the other end of the torsion spring is fixedly connected to the rotating connection of the sealing plate 213. When the torsion spring is in the initial state, it pushes the sealing plate 213 to abut against the other side wall of the discharge port 202, that is, against the second template 220. When the coating liquid is input into the two feed ports 201, the coating liquid pushes the sealing plate 213 through the discharge port 202. When the pushing force of the coating liquid overcomes the elastic force of the torsion spring, it pushes the sealing plate 213 to rotate to open the discharge port 202, and the coating liquid is squeezed out from the discharge port 202.

[0063] It should be noted that the automatic closing switch of the present invention is not limited to the above structure, and other structures that can achieve the automatic closing function are also possible, and no specific limitation is made here.

[0064] In a further embodiment, a slide rail 130 is provided on the frame 100, and the slide rail 130 is horizontally arranged. The slide rail 130 is an air-floating type. The two ends of the coating die 200 are respectively located in the two slide rails 130. The coating die 200 slides along the slide rail 130 so as to evenly coat the coating liquid on the surface of the plate 300 to be processed.

[0065] The specific working process of an air flotation coating machine provided by the present invention is described in combination with the above embodiments:

[0066] Start the two robotic arms 110 and set the working time of the two robotic arms so that the robotic arms 110 work in sequence. One robotic arm 110 clamps the plate 300 to be processed onto the workbench 120, and the other robotic arm 110 waits for the plate 300 to be processed. After the processing is completed, the robotic arm 110 clamps the plate 300 to other areas.

[0067] In the initial state, the two sliding plates 280 do not block the two communicating grooves 240 in the chamber, and the wave crests on the two surfaces of the elastic plate 270 abut against the arc grooves 281 of the two sliding plates 280 .

[0068] Start the coating liquid conveyor (not shown in the figure), and the coating liquid conveyor conveys the coating liquid to the cavity 230 of the coating die head 200 through the two feed ports 201 on the coating die head 200. The coating liquid will pass through a plurality of fixedly arranged wavy guide plates 250 in the cavity 230. Since the crests and troughs of the wavy guide plates 250 are staggered, that is, both sides of a crest are troughs, the coating liquid will reduce its flow speed when passing through the crest and will move to both sides of the crest, that is, move in a direction close to the troughs on both sides, so that the coating liquid moves downward as synchronously as possible when moving vertically downward, which can ensure that the gas in the discharge port 202, that is, the rectangular slit, is completely discharged to avoid the occurrence of bubbles in the coating liquid, and at the same time, it can also improve the uniformity of the liquid at the discharge port 202 and improve the coating effect.

[0069] As the coating liquid slowly flows, the two sliding plates 280 are gradually pushed to move vertically downward. The two sliding plates 280 move vertically downward to compress the elastic member 282. The two sliding plates 280 pull the elastic plate 270 to extend downward. The wave peaks on the two surfaces of the elastic plate 270 gradually separate from the arc grooves 281 on the two sliding plates 280, and the two sliding plates 280 simultaneously block the two connecting grooves 240. The coating liquid passes between the two sliding plates 280 and enters the discharge port 202. The coating liquid gradually pushes out the sealing plate 213 on the inner wall of the discharge port 202. When the pushing force of the coating liquid is greater than the elastic force of the torsion spring on the sealing plate 213, the sealing plate 213 is pushed to rotate around the connecting shaft 214 to open the discharge port 202. The coating liquid passes through the discharge port 202, that is, a layer of thin film is squeezed out from the rectangular slit. As the coating die head 200 moves on the slide rail 130, the thin film is coated on the surface of the plate 300 to be processed, and the coating is completed.

[0070] After the coating is completed, the conveying of the coating liquid conveyor needs to be stopped. At this time, the coating die head 200 slides in the opposite direction to reset so as to coat the next plate 300 to be processed. During the resetting process of the coating die head 200, the two sliding plates 280 in the cavity 230 are gradually reset vertically upward under the action of the elastic member 282. During the upward movement, the two sliding plates 280 are first in the first state, that is, the two sliding plates 280 block the two connecting grooves 240 while the elastic plate 270 is gradually reset so that the peaks on the two surfaces are re-contacted in the arc grooves 281 of the two sliding plates 280, thereby making the chamber below the elastic plate 270, that is, near the discharge port 202, gradually in a negative pressure state. At this time, the coating liquid on the outside of the discharge port 202 can be adsorbed into the inside of the discharge port 202, thereby avoiding excessive contact between the coating liquid on the outside of the discharge port 202 and the outside air.

[0071] When the two sliding plates 280 are in the second state, that is, the two sliding plates 280 open the two connecting grooves 240, and at the same time, the chamber near the feed port 201 is in a positive pressure state, and a part of the coating liquid at the feed port 201 enters the chamber near the discharge port 202 through the connecting groove 240 and mixes with the coating liquid there.

[0072] After the coating die 200 is reset, the coating liquid conveyor conveys the coating liquid again, and a part of the coating liquid near the feed port 201 enters the discharge port 202 again through the connecting groove 240, and mixes with the coating liquid at this position again. The coating liquid has a certain impact force when entering this position from the connecting groove 240, thereby alleviating the sedimentation problem of the coating liquid at this location, and the coating liquid is squeezed out from the discharge port 202, thereby completing the coating of the second plate 300 to be processed.

[0073] The subsequent processing methods of the third, fourth and Nth plates 300 to be processed are the same as the above steps.

[0074] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0075] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An air flotation coating machine, characterized in that: include: A frame, on which a mechanical arm and a workbench are arranged, and the mechanical arm can place the plate to be processed on the workbench; A coating die head is slidably arranged on the frame, and a feed inlet and a discharge outlet are provided on the coating die head. The coating die head slides through the workbench and can extrude the coating liquid from the discharge outlet to cover the surface of the plate to be processed; The coating die head has a cavity inside, the cavity is connected to the feed port and the discharge port, a plurality of vertically arranged wavy guide plates are fixed in the cavity, the plurality of wavy guide plates are arranged in rows and at intervals, and the crests and troughs of adjacent wavy guide plates are arranged in a staggered manner; A mixing assembly, the mixing assembly comprising two sliding plates, the two sliding plates are symmetrically and vertically arranged on the side walls in the cavity, a connecting groove is opened on the side walls corresponding to the two sliding plates, the two ends of the connecting groove are respectively close to the feed port and the discharge port, the two sliding plates can slide in the vertical direction to open or block the connecting groove, and the two sliding plates are configured as follows: When the coating liquid starts to be input into the feed port, the two sliding plates gradually move vertically downward to block the connecting groove, and the coating liquid can first pass through the connecting groove and then pass between the two sliding plates; When the feed port stops inputting the coating liquid, the two sliding plates are reset vertically upward to reopen the connecting groove; An elastic plate is arranged between the two sliding plates, the elastic plate is wavy, one end of the elastic plate is connected to the bottom of a plurality of wavy guide plates, and the other end of the elastic plate is connected to the two sliding plates at the same time. When the two sliding plates move in the vertical direction, the elastic plate can drive the elastic plate to expand and contract. When the elastic plate expands and contracts, the wave crests on its two surfaces can be separated from or abutted against the ends of the two sliding plates that are close to each other. The two sliding plates have a first state and a second state when they are reset vertically upward; When the two sliding plates are in the first state, the wave peaks on the two surfaces of the elastic plate abut against the ends of the two sliding plates that are close to each other, the two sliding plates block the connecting groove, and the chamber near the discharge port is in a negative pressure state; When the two sliding plates are in the second state, the wave peaks on the two surfaces of the elastic plate abut against one end of the two sliding plates close to each other, the two sliding plates open the connecting groove, and the chamber close to the feed port is in a positive pressure state.

2. The air flotation coating machine according to claim 1, characterized in that: The two sliding plates are respectively connected with elastic pieces.

3. The air flotation coating machine according to claim 2, characterized in that: The elastic member is a spring.

4. The air flotation coating machine according to claim 1, characterized in that: The coating die head comprises a first template and a second template. The first template is provided with a first groove, the second template is provided with a second groove, the first template and the second template are fitted with each other, and the first groove and the second groove form the cavity.

5. The air flotation coating machine according to claim 4, characterized in that: A pad is provided between the first template and the second template.

6. The air flotation coating machine according to claim 1, characterized in that: An automatic closing switch is arranged at the discharge port, and the automatic closing switch blocks the discharge port in an initial state, and opens the discharge port when the automatic closing switch is pushed by the coating liquid.

7. The air flotation coating machine according to claim 6, characterized in that: The automatic closing switch includes a blocking plate and a connecting shaft. A fan-shaped groove is provided on the inner wall of the discharge port. The connecting shaft is fixed at the center of the fan-shaped groove. The blocking plate is rotatably connected to the connecting shaft. A torsion spring is provided at the rotating connection of the blocking plate. The torsion spring can push the blocking plate to block the discharge port.

8. The air flotation coating machine according to claim 1, characterized in that: The frame is symmetrically provided with slide rails, the slide rails are arranged horizontally, and the coating die head slides along the slide rails.

Images