A double coating head coating machine

Abstract

The present invention relates to the technical field of coating devices, and specifically to a double-coating head coating machine. It includes a frame, a conveying mechanism, a coating mechanism, a drying mechanism and a feeding mechanism; the coating mechanism includes a workbench, a support frame, a first die head, a second die head, a pre-coating component and a switching component; the present invention ensures that the coating liquid is evenly distributed on the end of the coating head by setting the pre-coating component, thereby ensuring the coating quality. By setting the first die head and the second die head, and the two are in a vertically distributed state, the overall volume of the coating machine is reduced, and the first die head and the second die head are alternately coated during the coating process through the switching component, and the pre-coating work of the other coating head is completed during the return process after completing one coating, thereby improving the coating efficiency. By setting a recovery tank, a scraper and a sealing strip, the coating liquid on the surface of the first pre-coating roller or the second pre-coating roller is scraped into the recovery tank, and the second die head or the first die head is pre-coated to avoid waste of coating liquid.

Description

Technical Field

[0001] The invention relates to the technical field of coating devices, and in particular to a double-coating-head coating machine. Background Art

[0002] Coating machine, also known as brush coating machine, scraper coating machine, coating machine, etc., is mainly used for surface coating process production of film, paper, substrate, etc. It uses a special multi-functional coating head to achieve various forms of surface coating. According to different coating methods and technologies, coating machines can be divided into many types, such as brush coating machine, air knife coating machine, scraper coating machine, roller coating machine, spray coating machine, curtain coating machine and slot coating machine, etc.

[0003] Among them, the slit coater is often used in industries that require precision coating and uniform coating, such as the production of solar cells, due to its high precision and high efficiency. The working principle of the slit coater is to use the module made by precision machining, and the coating mold moves accurately relative to the substrate, so that the liquid chemical material is squeezed out along the gap of the coating mold under a certain pressure and flow rate, and transferred to the substrate (such as glass) to form a thin film. During coating, a liquid bridge needs to be formed between the substrate and the coating knife to ensure the coating quality.

[0004] The existing slit coating equipment cannot form a liquid bridge immediately when starting coating, resulting in a large uncoated area on the substrate. In order to ensure the coating quality, a Chinese patent document with authorization announcement number CN222019889U discloses a coating platform and a coating machine using the same. The patent sets a full coating structure to ensure that the substrate is fully coated, but this method cannot ensure uniform thickness of the coating and has the problem of low coating efficiency. Summary of the invention

[0005] According to the shortcomings of the prior art, the present invention proposes a double-coating head coating machine, which solves the problems of poor coating quality and low coating efficiency of the coating machine in the prior art.

[0006] A double-coating head coating machine of the present invention adopts the following technical solution, including a frame, a conveying mechanism, a coating mechanism, a drying mechanism and a feeding mechanism;

[0007] The frame is provided with a loading station, a coating station, a drying station and a unloading station in sequence along the first direction;

[0008] The conveying mechanism is used to convey the substrate between the loading station, the coating station, the drying station and the unloading station;

[0009] The coating mechanism comprises a workbench, a support frame, a first die head, a second die head, an injection assembly, a driving assembly, a pre-coating assembly and a switching assembly; the workbench is arranged horizontally and extends along a first direction for supporting a substrate; the support frame can be installed at the coating station movably along an up-down direction and a first direction, the first die head and the second die head are both installed on the support frame, a coating head is arranged at one end of the first die head and the second die head pointing to the substrate, a first flow channel is provided in the first die head and the second die head, one end of the first flow channel is connected to the injection assembly, and the other end is connected to the coating head; the injection assembly is used to inject coating liquid or cleaning liquid into the first die head and the second die head; the driving assembly is used to drive the support frame to reciprocate along the first direction; the pre-coating assembly is used to make the first die head or the second die head pre-coat on the pre-coating assembly when the support frame approaches the loading station; the switching assembly is used to make the first die head and the second die head switch positions; the drying mechanism is arranged at the drying station;

[0010] The unloading mechanism is arranged at the unloading station.

[0011] Optionally, the coating mechanism further includes a positioning plate and two rotating disks;

[0012] The positioning plate is vertically arranged and extends along a second direction, and the second direction is perpendicular to the first direction; the positioning plate is fixedly connected to the support frame;

[0013] The two turntables are respectively arranged on both sides of the second direction of the positioning plate. The turntables can rotate around their own axes and can be movably installed on the support frame along the first direction. The first die head and the second die head can be rotatably installed between the two turntables. The rotation axes of the first die head and the second die head relative to the turntable are respectively located above their own center of gravity; in the initial state, the first die head is located above the second die head, and the end face of the first die head facing the positioning plate is abutted against the positioning plate.

[0014] Optionally, two switching assemblies are provided, which are respectively located on both sides of the support frame in the second direction; the switching assembly includes a movable plate, a cylinder and a switching motor; the movable plate can be movably installed on the support frame along the first direction, and a rotating shaft is coaxially fixed on the side of the turntable away from the first die head, and the rotating shaft is rotatably installed on the movable plate; the cylinder is fixedly connected to the support frame, and the movable end of the cylinder is connected to the movable plate; the rotating shaft is connected to the switching motor.

[0015] Optionally, the pre-coating assembly includes a first pre-coating roller and a second pre-coating roller, both of which are located between two turntables, the first pre-coating roller can be rotatably installed around its own axis above the second die head, and the second pre-coating roller can be rotatably installed around its own axis above the first die head; in the initial state, the coating head of the first die head is in contact with the first pre-coating roller; the first pre-coating roller and the second pre-coating roller are both connected to a pre-coating motor.

[0016] Optionally, a recovery groove is provided at the upper end of the first die head and the upper end of the second die head.

[0017] Optionally, a scraper is provided at the upper end of the first die head and the second die head, and the scraper extends along the second direction. One end of the scraper is fixedly connected to the first die head or the second die head, and the other end points to the second pre-coating roller or the first pre-coating roller and abuts against it.

[0018] Optionally, a second flow channel is provided in both the first die head and the second die head. The second flow channel extends vertically, the upper end of the second flow channel is communicated with the recovery tank, and the lower end of the second flow channel is communicated with the first flow channel.

[0019] Optionally, both the first pre-coating roller and the second pre-coating roller are provided with sealing strips, and the sealing strips can be elastically deformed.

[0020] Optionally, a third flow channel is further provided in the first die head and the second die head, the diameter of the third flow channel is larger than the diameters of the first flow channel and the second flow channel, and the third flow channel extends along the second direction.

[0021] Optionally, the injection assembly includes a first storage box, a second storage box, two first injection pipes, two second injection pipes and multiple pressure pumps, the first storage box is filled with coating liquid, and the second storage box is filled with cleaning liquid; the two first injection pipes are both connected to the first storage box, and the other ends are respectively connected to the two first flow channels; the two second injection pipes are both connected to the second storage box, and the other ends are respectively connected to the two first flow channels; the first injection pipe and the second injection pipe are both connected to the pressure pump.

[0022] The beneficial effects of the present invention are as follows: a dual-coating head coating machine of the present invention ensures that the coating liquid is evenly distributed on the end of the coating head by setting a pre-coating component, so that a liquid bridge can be smoothly formed when the coating head contacts the substrate, thereby ensuring the coating quality. By setting a first die head, a second die head and a switching component, the first die head and the second die head can alternately complete the coating during the coating process, and when one coating head completes the coating and returns, the pre-coating work of the other coating head can be completed, thereby improving the coating efficiency.

[0023] Furthermore, by arranging the first die head and the second die head in a vertically distributed state and performing the pre-coating work during the return process of the support frame, the overall volume of the coating machine is reduced while ensuring the coating quality.

[0024] Furthermore, by setting a recovery tank, a scraper and a sealing strip, the coating liquid on the surface of the first pre-coating roller or the second pre-coating roller is scraped into the recovery tank, and the second die head or the first die head is pre-coated to avoid waste of the coating liquid. By setting a third flow channel, it is avoided that gas is mixed into the coating liquid during the coating process, the coating thickness is uneven, or the surface of the coated product is uneven, bubbling, wrinkling, depression (shrinkage hole), etc., which affects the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of a double-coating head coating machine of the present invention;

[0027] Figure 2 It is a structural schematic diagram of a coating mechanism in a double-coating head coating machine of the present invention;

[0028] Figure 3 It is a front view of a coating mechanism in a double-coating head coating machine of the present invention;

[0029] Figure 4 It is a side view of a coating mechanism in a double-coating head coating machine of the present invention;

[0030] Figure 5 for Figure 4 Middle AA section cutaway view;

[0031] Figure 6 for Figure 5 Enlarged image at the center X;

[0032] Figure 7 When the sealing strip is in the recovery tank Figure 5 Enlarged image at the center X.

[0033] In the figure: 100, rack;

[0034] 200, coating mechanism; 210, workbench; 220, support frame; 230, first die head; 231, first flow channel; 232, second flow channel; 233, third flow channel; 234, recovery tank; 235, scraper; 236, sealing strip; 240, second die head; 250, positioning plate; 260, turntable; 261, rotating shaft; 270, pre-coating assembly; 271, first pre-coating roller; 272, second pre-coating roller; 280, switching assembly; 281, moving plate; 282, cylinder;

[0035] 300, drying mechanism;

[0036] 400, unloading mechanism;

[0037] 500. Substrate. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] like Figures 1 to 6 As shown, a dual-coating head coating machine provided by an embodiment of the present invention includes a frame 100 , a conveying mechanism, a coating mechanism 200 , a drying mechanism 300 and a feeding mechanism 400 .

[0040] The frame 100 is provided with a loading station, a coating station, a drying station and a unloading station in sequence along the first direction.

[0041] The conveying mechanism is used to convey the substrate 500 between the loading station, the coating station, the drying station and the unloading station.

[0042] The coating mechanism 200 includes a workbench 210, a support frame 220, a first die head 230, a second die head 240, an injection assembly, a drive assembly, a pre-coating assembly 270 and a switching assembly 280; the workbench 210 is horizontally arranged and extends along a first direction, and is used to support the substrate 500; the support frame 220 can be installed at the coating station movably along the up-down direction and the first direction, the first die head 230 and the second die head 240 are both installed on the support frame 220, and a coating head is arranged at one end of the first die head 230 and the second die head 240 pointing to the substrate 500, and the first die head 2 A first flow channel 231 is provided in both the first die 230 and the second die 240, one end of the first flow channel 231 is connected to the injection assembly, and the other end is connected to the coating head; the injection assembly is used to inject coating liquid into the first die 230 and the second die 240; the driving assembly is used to drive the support frame 220 to reciprocate along the first direction; the pre-coating assembly 270 is used to pre-coat the first die 230 or the second die 240 on the pre-coating assembly 270 when the support frame 220 approaches the loading station; the switching assembly 280 is used to switch the positions of the first die 230 and the second die 240.

[0043] The drying mechanism 300 is disposed at the drying station.

[0044] The unloading mechanism 400 is arranged at the unloading station.

[0045] When coating, the photovoltaic glass substrate 500 is placed at the loading station, and the conveying mechanism moves the glass substrate 500 from the loading station to the coating station and places it on the workbench 210. In the initial state, the support frame 220 is located on the side of the workbench 210 away from the drying station; the injection component injects the coating liquid into the first die head 230, and the coating liquid flows to the coating head through the first flow channel 231. The coating head of the first die head 230 performs pre-coating on the pre-coating component 270, so that the coating liquid is evenly distributed on the end of the coating head pointing to the substrate 500, and the switching component 28 0 The positions of the first die head 230 and the second die head 240 are switched, and then the driving component is started, and the driving component drives the support frame 220 to move along the first direction, gradually approaching the substrate 500, and after the coating head contacts the substrate 500, the coating liquid is evenly coated on the upper surface of the substrate 500 to complete the coating work, and the conveying mechanism transfers the coated substrate 500 to the drying station, and the drying mechanism 300 dries the coated substrate 500. After drying, the coated substrate 500 is removed from the frame 100 by the unloading mechanism 400.

[0046] After the coating work is completed, the driving component drives the support frame 220 to move along the first direction and approach the loading station. During this process, the injection component injects the coating liquid into the second die head 240, and the coating liquid flows to the coating head of the second die head 240 through the first flow channel 231 of the second die head 240. The coating head of the second die head 240 is pre-coated on the pre-coating component 270 to make the coating liquid at the end of the coating head evenly distributed. During the return of the support frame 220, the second die head 240 completes the pre-coating work. After the support frame 220 returns to the original position, the conveying mechanism transports another glass substrate 500 to the workbench 210. During the process of the conveying mechanism conveying the substrate 500, the switching component 280 switches the positions of the first die head 230 and the second die head 240. After the substrate 500 is placed on the workbench 210, the driving component drives the support frame 220 to move to complete the next coating work. After that, the above process is repeated repeatedly. Compared with the prior art, the present invention provides a pre-coating component 270 to ensure that the coating liquid is evenly distributed on the end of the coating head, so that a liquid bridge can be smoothly formed when the coating head contacts the substrate 500, thereby ensuring the coating quality. By providing the first die head 230, the second die head 240 and the switching component 280, the first die head 230 and the second die head 240 alternately complete the coating during the coating process, and when one coating head completes the coating and returns, the pre-coating work of the other coating head can be completed, thereby improving the coating efficiency.

[0047] In a further embodiment, Figure 2 , Figure 3 , Figure 5 As shown, the coating mechanism 200 further includes a positioning plate 250 and two rotating disks 260 .

[0048] The positioning plate 250 is vertically arranged and extends along a second direction, and the second direction is perpendicular to the first direction; the positioning plate 250 is fixedly connected to the support frame 220 .

[0049] The two turntables 260 are respectively arranged on both sides of the second direction of the positioning plate 250. The turntables 260 can rotate around their own axes and can be movably installed on the support frame 220 along the first direction. The first die head 230 and the second die head 240 can be rotatably installed between the two turntables 260. The rotation axes of the first die head 230 and the second die head 240 relative to the turntable 260 are respectively located above their own centers of gravity; in the initial state, the first die head 230 is located above the second die head 240, and the end faces of the first die head 230 and the second die head 240 facing the positioning plate 250 are in contact with the positioning plate 250.

[0050] When the positions of the first die head 230 and the second die head 240 need to be switched, the switching assembly 280 first drives the turntable 260 away from the positioning plate 250, then drives the turntable 260 to rotate 180° around its own axis, and finally drives the turntable 260 close to the positioning plate 250; after the turntable 260 moves away from the positioning plate 250, the first die head 230 and the second die head 240 are separated from the abutment with the positioning plate 250; during the rotation of the turntable 260, since the first die head 230 and the second die head 240 are located above the center of gravity relative to the rotation axis of the turntable 260, Therefore, the first die head 230 and the second die head 240 are in an approximately vertical state under the action of gravity. When the turntable 260 rotates 180° around its own axis, the first die head 230 and the second die head 240 switch positions. When the turntable 260 approaches the positioning plate 250, the first die head 230 and the second die head 240 maintain an approximately vertical state. When the first die head 230 and the second die head 240 abut against the positioning plate 250 again, the first die head 230 and the second die head 240 are adjusted to a vertical state. At this point, the switching work is completed.

[0051] In a further embodiment, Figure 2 , Figure 5 As shown, the pre-coating assembly 270 includes a first pre-coating roller 271 and a second pre-coating roller 272, both of which are located between the two turntables 260. The first pre-coating roller 271 is rotatably installed on the top of the second die head 240 around its own axis, and the second pre-coating roller 272 is rotatably installed on the top of the first die head 230 around its own axis. In the initial state, the coating head of the first die head 230 is in contact with the first pre-coating roller 271; the first pre-coating roller 271 and the second pre-coating roller 272 are both connected to a pre-coating motor.

[0052] Before coating begins and the support frame 220 is in the return process, when the first die head 230 needs to be pre-coated, the first die head 230 is located above the second die head 240, and the coating head of the first die head 230 contacts the first pre-coating roller 271, the injection assembly injects the coating liquid into the first die head 230, the coating liquid flows to the coating head of the first die head 230 through the first flow channel 231, part of the coating liquid flows out of the coating head and flows to the first pre-coating roller 271, the pre-coating motor is started, and the pre-coating motor drives the first pre-coating roller 271 to rotate around its own axis until the first die head 230 The coating liquid is evenly distributed on the coating head, and the pre-coating work of the first die head 230 is completed. After that, the rotating disk 260 is moved along the first direction by the switching component 280 for a preset distance, and then the rotating disk 260 is rotated 180° around its own axis. After the rotating disk 260 stops rotating, the first die head 230 is located below the second die head 240, and the rotating disk 260 moves toward the positioning plate 250 until the first die head 230 and the second die head 240 are in contact with the positioning plate 250. After that, only the vertical positions of the first die head 230 and the second die head 240 need to be adjusted to directly carry out the coating work. After the rotating disk 260 stops rotating and moving, the coating head of the second die head 240 contacts the second pre-coating roller 272 to prepare for the subsequent pre-coating work.

[0053] When it is necessary to pre-coat the second die head 240, the injection assembly injects coating liquid into the second die head 240, and part of the coating liquid flows through the first flow channel 231 and the coating head of the second die head 240, and flows to the second pre-coating roller 272, and the pre-coating motor is started. The pre-coating motor drives the second pre-coating roller 272 to rotate around its own axis until the coating liquid is evenly distributed on the coating head of the second die head 240, and the pre-coating work of the second die head 240 is completed. Thereafter, the switching assembly 280 is used to switch the positions of the first die head 230 and the second die head 240, and the second die head 240 is used to perform coating work after adjusting the vertical positions of the first die head 230 and the second die head 240. At this time, the coating head of the first die head 230 is in contact with the first pre-coating roller 271, preparing for the subsequent pre-coating work.

[0054] The present invention arranges the first die head 230 and the second die head 240 to be in a vertically distributed state, and performs the pre-coating work during the return process of the support frame 220, thereby reducing the overall volume of the coating machine while ensuring the coating quality.

[0055] In a further embodiment, Figure 2 , Figure 3 , Figure 4As shown, two switching components 280 are provided, which are respectively located on both sides of the second direction of the support frame 220; the switching component 280 includes a moving plate 281, a cylinder 282 and a switching motor; the moving plate 281 can be movably installed on the support frame 220 along the first direction, and a rotating shaft 261 is coaxially fixed on the side of the turntable 260 away from the first die head 230, and the rotating shaft 261 is rotatably installed on the moving plate 281; the cylinder 282 is fixedly connected to the support frame 220, and the movable end of the cylinder 282 is connected to the moving plate 281; the rotating shaft 261 is connected to the switching motor, and the transmission relationship between the rotating shaft 261 and the switching motor can be belt drive, chain drive or gear drive.

[0056] When it is necessary to switch the positions of the first die head 230 and the second die head 240, start the cylinder 282, which pushes the movable plate 281 to move away from the positioning plate 250, so that the first die head 230 and the second die head 240 are out of contact with the positioning plate 250. Then, turn off the cylinder 282 and start the switching motor. The switching motor rotates, and drives the turntable 260 to rotate through the rotating shaft 261. When the turntable 260 rotates 180°, the first die head 230 and the second die head 240 switch positions. Then, turn off the switching motor and start the cylinder 282 again. The cylinder 282 drives the movable plate 281 to move closer to the positioning plate 250 until the first die head 230 and the second die head 240 are in contact with the positioning plate 250 again, completing the switching work.

[0057] In a further embodiment, Figure 5 , Figure 6 , Figure 7 As shown, the upper ends of the first die head 230 and the second die head 240 are both provided with recovery grooves 234. When pre-coating the first die head 230, the coating liquid flowing down from the first pre-coating roller 271 enters the recovery groove 234 at the upper end of the second die head 240; when pre-coating the second die head 240, the coating liquid flowing down from the second pre-coating roller 272 enters the recovery groove 234 at the upper end of the first die head 230, thereby avoiding waste of the coating liquid.

[0058] In a further embodiment, a scraper 235 is provided at the upper end of the first die 230 and the second die 240. The scraper 235 extends along the second direction, one end of the scraper 235 is fixedly connected to the first die 230 or the second die 240, and the other end is in contact with the second pre-coating roller 272 or the first pre-coating roller 271. During the pre-coating process, the scraper 235 scrapes the coating liquid on the surface of the first pre-coating roller 271 or the second pre-coating roller 272 into the recovery tank 234 to avoid waste.

[0059] In a further embodiment, Figure 6 , Figure 7As shown, the first die head 230 and the second die head 240 are both provided with a second flow channel 232, the second flow channel 232 extends vertically, the upper end of the second flow channel 232 is communicated with the recovery tank 234, and the lower end of the second flow channel 232 is communicated with the first flow channel 231. The coating liquid in the recovery tank 234 flows through the second flow channel 232 into the first flow channel 231, and then flows to the coating head of the first die head 230 or the second die head 240 through the first flow channel 231, and the recovered coating liquid is further utilized, and the coating liquid can be reused after being recovered.

[0060] In a further embodiment, a sealing strip 236 is disposed on the first pre-coating roller 271 and the second pre-coating roller 272 , and the sealing strip 236 can be elastically deformed.

[0061] The sealing strip 236 is initially in the state as follows Figure 6 The horizontal position shown in FIG. 234 is used to prevent dust from entering the recovery tank 234. Figure 6 , Figure 7 The first pre-coating roller 271 continues to rotate counterclockwise. When the sealing strip 236 contacts the first die 230 or the second die 240 or the scraper 235, the sealing strip 236 undergoes elastic deformation. When the sealing strip 236 loses contact with the first die 230 or the second die 240 or the scraper 235, the sealing strip 236 returns to its original shape.

[0062] In a further embodiment, Figure 6 , Figure 7 As shown, a third flow channel 233 is also provided in the first die head 230 and the second die head 240. The diameter of the third flow channel 233 is larger than the diameters of the first flow channel 231 and the second flow channel 232, and the third flow channel 233 extends along the second direction. The coating liquid flowing out of the first flow channel 231 or the second flow channel 232 is evenly distributed along the second direction. At the same time, once the air enters the third flow channel 233 through the second flow channel 232, the air is located above the third flow channel 233, and the gas will not arrive at the coating head synchronously with the coating liquid, thereby avoiding the uneven coating thickness or unevenness, bubbling, wrinkling, depression (shrinkage) on the surface of the coated product due to the mixing of air into the coating liquid, which affects the coating quality.

[0063] In a further embodiment, the injection assembly includes a first storage box, a second storage box, two first injection tubes, two second injection tubes and a plurality of pressure pumps, the first storage box is filled with coating liquid, and the second storage box is filled with cleaning liquid; the two first injection tubes are connected to the first storage box, and the other ends are respectively connected to the two first flow channels 231; the two second injection tubes are connected to the second storage box, and the other ends are respectively connected to the two first flow channels 231; the first injection tube and the second injection tube are both connected to a pressure pump. When coating, the pressure pump on the first injection tube applies pressure to guide the coating liquid in the first storage box to the first flow channel 231 of the first die head 230 or the second die head 240; when coating is completed, the pressure pump on the second injection tube applies pressure to guide the cleaning liquid in the second storage box to the first flow channel 231 of the first die head 230 or the second die head 240 to clean the coating head.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-head coating machine, characterized in that: It includes a frame, a conveying mechanism, a coating mechanism, a drying mechanism and a feeding mechanism; The frame is provided with a loading station, a coating station, a drying station and a unloading station in sequence along the first direction; The conveying mechanism is used to convey the substrate between the loading station, the coating station, the drying station and the unloading station; The coating mechanism includes a workbench, a support frame, a first die head, a second die head, an injection assembly, a driving assembly, a pre-coating assembly and a switching assembly; the workbench is horizontally arranged and extends along a first direction for supporting the substrate; The support frame can be installed on the coating station movably along the up-down direction and the first direction, the first die head and the second die head are both installed on the support frame, the first die head and the second die head are provided with a coating head at one end pointing to the substrate, the first die head and the second die head are both provided with a first flow channel, one end of the first flow channel is connected to the injection assembly, and the other end is connected to the coating head; the upper end of the first die head and the upper end of the second die head are both provided with a recovery groove; the injection assembly is used to inject the coating liquid or the cleaning liquid into the first die head and the second die head; the driving assembly is used to drive the support frame to reciprocate along the first direction; The switching assembly is used to switch the positions of the first die head and the second die head; the drying mechanism is arranged at the drying station; two switching assemblies are arranged, which are respectively located on both sides of the second direction of the support frame; the switching assembly comprises a moving plate, a cylinder and a switching motor; the moving plate can be movably installed on the support frame along the first direction, a rotating shaft is coaxially fixed on the side of the turntable away from the first die head, and the rotating shaft is rotatably installed on the moving plate; the cylinder is fixedly connected to the support frame, and the movable end of the cylinder is connected to the moving plate; the rotating shaft is connected to the switching motor; The pre-coating assembly is used to make the first die head or the second die head pre-coat on the pre-coating assembly when the support frame approaches the loading station; the pre-coating assembly includes a first pre-coating roller and a second pre-coating roller, both of which are located between two rotating disks, the first pre-coating roller can be rotatably installed on the top of the second die head around its own axis, and the second pre-coating roller can be rotatably installed on the top of the first die head around its own axis; in the initial state, the coating head of the first die head contacts the first pre-coating roller; the first pre-coating roller and the second pre-coating roller are both connected to a pre-coating motor; A positioning plate is fixedly connected to the support frame; the positioning plate is vertically arranged and extends along a second direction, and the second direction is perpendicular to the first direction; turntables are respectively arranged on both sides of the second direction of the positioning plate; the turntable can rotate around its own axis and can be movably installed on the support frame along the first direction, and the first die head and the second die head can be rotatably installed between the two turntables, and the first die head and the second die head are respectively located above their own center of gravity relative to the rotation axis of the turntable; in the initial state, the first die head is located above the second die head, and the end face of the first die head facing the positioning plate abuts against the positioning plate; The unloading mechanism is arranged at the unloading station.

2. A double-head coating machine according to claim 1, characterized in that: The upper ends of the first die head and the second die head are both provided with scrapers, which extend along the second direction. One end of the scraper is fixedly connected to the first die head or the second die head, and the other end points to the second pre-coating roller or the first pre-coating roller and abuts against it.

3. A double-head coating machine according to claim 2, characterized in that: A second flow channel is provided in both the first die head and the second die head. The second flow channel extends vertically. The upper end of the second flow channel is communicated with the recovery tank, and the lower end of the second flow channel is communicated with the first flow channel.

4. A double-head coating machine according to claim 3, characterized in that: The first pre-coating roller and the second pre-coating roller are both provided with sealing strips, and the sealing strips can be elastically deformed.

5. A double-head coating machine according to claim 4, characterized in that: A third flow channel is also provided in the first die head and the second die head. The diameter of the third flow channel is greater than the diameters of the first flow channel and the second flow channel. The third flow channel extends along the second direction.

6. A double-head coating machine according to claim 1, characterized in that: The injection assembly includes a first storage box, a second storage box, two first injection pipes, two second injection pipes and multiple pressure pumps. The first storage box is filled with coating liquid, and the second storage box is filled with cleaning liquid; the two first injection pipes are both connected to the first storage box, and the other ends are respectively connected to the two first flow channels; the two second injection pipes are both connected to the second storage box, and the other ends are respectively connected to the two first flow channels; the first injection pipe and the second injection pipe are both connected to the pressure pump.

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