Four-roller coating equipment for aluminum material machining and operation method of four-roller coating equipment

Abstract

The invention relates to the field of aluminum product coating, and discloses four-roller coating equipment for aluminum product machining, which comprises a rack, a coating assembly, a coating disc assembly, a movable support and a first linear module for driving the movable support to move are arranged on the rack, the coating disc assembly comprises a coating bottom pool, and a pool cover is arranged at the upper opening end of the coating bottom pool; an opening is formed in the end face of the tank cover, a rectangular shell is arranged at the opening, a V-shaped shell is arranged at the upper opening end of the rectangular shell, the distance between the two side faces of the V-shaped shell in the moving direction of the movable support is gradually increased from bottom to top, a feeding inner tank is arranged in the rectangular shell, and a feeding thin opening is formed in the upper surface of the feeding inner tank. A feeding nozzle extends from an orifice of the feeding thin opening, a second peristaltic pump is arranged between the coating bottom pool and the feeding inner pool, a feeding roller close to the feeding nozzle is installed in the V-shaped shell, a floating valve floats on the coating liquid level in the coating bottom pool, and the floating valve can block a gap between the feeding inner pool and the rectangular shell.

Description

Technical Field

[0001] This invention relates to the field of aluminum processing, specifically to the field of aluminum coating, and particularly to a four-roller coating equipment for aluminum processing and its operating method. Background Technology

[0002] Four-roll coating of aluminum is a highly efficient and high-quality continuous coating production process, mainly used for the production of pre-coated aluminum coils (color-coated aluminum coils), and widely applied in building curtain walls, suspended ceilings, and appliance casings. The four rolls refer to the four most critical rollers in the coating process: the feed roller, the doctor blade roller, the coating roller, and the back coating roller. The back coating roller is located below the aluminum material, supporting it and guiding its smooth movement. The feed roller draws paint from a paint tray. The doctor blade roller works precisely with the feed roller to accurately control the amount of paint transferred to it. Then, the paint on the feed roller is transferred to the coating roller, which directly contacts the aluminum material, applying the paint to its surface.

[0003] If the paint used in the coating process is exposed to air for an extended period, it will deteriorate. This deterioration includes changes in paint viscosity due to solvent evaporation, paint skinning, and the introduction of foreign matter, all of which affect the coating quality. In existing technologies, the upper end of the paint tray is generally open, allowing the feed roller to extend in and draw in paint. Therefore, air can easily come into direct contact with the paint through the open end of the paint tray. Furthermore, since the feed roller rotates when drawing paint, this rotation agitates the paint in the tray, further exacerbating the paint deterioration problem. Therefore, it is necessary to improve and optimize its structure. Based on this, this invention proposes a four-roller coating device for aluminum processing and its operating method. Summary of the Invention

[0004] To address the problems mentioned in the background above, the present invention provides a four-roller coating equipment for aluminum processing and its operating method.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0006] A four-roller coating equipment for aluminum processing includes a frame, a coating assembly and a paint tray assembly mounted on the frame, a movable support and a first linear module for driving the movable support to move horizontally.

[0007] The paint tray assembly includes a paint tank mounted on a movable support. The upper open end of the paint tank is provided with a tank cover. The end face of the tank cover is provided with an opening. A rectangular shell is provided at the opening. A V-shaped shell is provided at the upper open end of the rectangular shell. The distance between the two sides of the V-shaped shell along the moving direction of the movable support increases from bottom to top. A feeding inner tank is provided inside the rectangular shell. A feeding nozzle is provided on the upper surface of the feeding inner tank. A feeding spout extends from the opening of the feeding nozzle.

[0008] A peristaltic pump is installed between the paint bottom tank and the inner feeding tank;

[0009] The paint tray assembly also includes a feed roller located inside the V-shaped housing and close to the feed nozzle;

[0010] A float valve floats on the surface of the paint liquid in the paint tank, which can seal the gap between the inner tank and the rectangular outer shell.

[0011] Furthermore, the outer surface of the feed roller is provided with semi-circular rubber protrusions, and several rubber protrusions are arranged in an array along the circumference of the feed roller.

[0012] Furthermore, the bottom of the paint tank is equipped with a stirring device.

[0013] Furthermore, the end face of the pool cover is provided with a guide hole, and a guide rod is installed in the guide hole. The bottom end of the guide rod extends into the bottom pool of the paint and is connected to the float valve. The float valve extends partially into the rectangular shell. There are two float valves, which are located on both sides of the inner pool of the feed. When the float valve moves upward, the part of the float valve located inside the rectangular shell can contact the outer surface of the inner pool of the feed and seal the gap between the inner pool of the feed and the rectangular shell.

[0014] Furthermore, the paint tray assembly also includes a peristaltic pump, the input end of which is connected to the storage tank for storing paint, and the output end is provided with a replenishment pipe, the end of which is connected to the bottom of the paint tank.

[0015] The peristaltic pump 2 has a connecting pipe 1 at its input end and a connecting pipe 2 at its output end. The end of the connecting pipe 1 is connected to the paint bottom tank, and the end of the connecting pipe 2 is connected to the inner tank for feeding materials.

[0016] Furthermore, a liquid level sensor is installed on the cover of the paint tank.

[0017] Furthermore, the coating assembly includes a back coating roller, a lifting roller, a doctor blade roller, and a coating roller, with the movable support arranged horizontally and perpendicular to the axial direction of the back coating roller.

[0018] The movable support is provided with mounting components, which include a first movable seat and a second linear module for driving the first movable seat to move. The moving direction of the first movable seat is parallel to the moving direction of the movable support, and two mounting components are provided along the moving direction of the first movable seat.

[0019] The back coating roller is mounted on the frame, the lifting roller is mounted on the movable bracket, and the scraper roller and the coating roller are respectively mounted on the first movable seats of the two mounting parts, with the scraper roller and the coating roller located on both sides of the lifting roller, and the coating roller close to the back coating roller.

[0020] The movable support is provided with a second movable seat and a third linear module for driving the second movable seat to move in the vertical direction. The feeding roller is installed on the second movable seat, and the feeding roller is parallel to the lifting roller and located below the lifting roller.

[0021] Furthermore, a main motor is installed on the movable support, and the main motor is connected to the input end of the lifting roller through a power transmission component;

[0022] The feeding roller, lifting roller, scraper roller, and coating roller are connected by a power connector.

[0023] Furthermore, a side support is provided on one side of the movable support, a slide is slidably installed on the side support, a connecting rope is provided at the bottom of the slide, and a counterweight is provided at the end of the connecting rope.

[0024] The power connection includes a drive pulley at the end of the lifting roller, a connecting pulley at the end of the feeding roller, a pressing pulley on the side support, and two driven pulleys at the ends of the scraper roller and the coating roller, respectively. A synchronous belt is provided between the drive pulley, the driven pulley, the pressing pulley, and the connecting pulley.

[0025] An operating method for a four-roller coating machine for aluminum processing:

[0026] Step 1: The main motor drives the feeding roller, lifting roller, scraper roller, and coating roller to rotate;

[0027] Meanwhile, the peristaltic pump 2 draws the paint from the paint tank to the feeding tank. As the amount of paint in the feeding tank increases and the liquid level rises, the paint will eventually flow out from the feeding nozzle and adhere to the feeding roller. The feeding roller will then transfer the paint to the lifting roller, and the scraper roller will scrape off the paint on the lifting roller to make the paint thickness on the lifting roller meet the preset value. The scraped paint will eventually flow back to the paint tank, and the paint on the lifting roller that meets the preset thickness value will be transferred to the coating roller, and then transferred to the aluminum surface.

[0028] Step 2: After one roll of aluminum has been coated, replace it with a new roll of aluminum.

[0029] At the same time, the paint in the inner supply tank is pulled back to the bottom paint tank by the second peristaltic pump, and new paint is pulled into the bottom paint tank by the first peristaltic pump. As the liquid level of the paint in the bottom paint tank rises, the float valve rises accordingly and finally seals the gap between the inner supply tank and the rectangular outer shell.

[0030] Step 3: After the new aluminum material has been replaced, repeat Step 1.

[0031] Compared with the prior art, the beneficial effects of this invention are as follows:

[0032] This invention indirectly supplies coatings to the lifting roller via a feeding roller placed inside a V-shaped shell. Its technical advantages are:

[0033] Technical effect 1: In the prior art, the paint tank (i.e., paint tray) is generally set to be open so that the lifting roller can be inserted into the paint tray to adhere the paint. The paint in the paint tray will be in direct contact with the outside air and is easily oxidized.

[0034] In contrast, in this case, the feed roller was placed inside a V-shaped shell, creating a narrow channel. Therefore, the paint in the paint tank was not directly exposed to the flowing air, thus preventing further oxidation of the paint.

[0035] Technical effect 2: In this case, a recessed structure is formed between adjacent rubber protrusions on the outer circular surface of the feed roller, which can collect sufficient paint. Moreover, the protrusion structure supported by the rubber material can be squeezed and flattened, making it easier for the paint to be transferred from the feed roller to the lifting roller, thus ensuring effective feeding of the lifting roller.

[0036] Technical effect 3: In the existing technology, when the lifting roller is used to directly extract the paint in the paint tank by rotating, the rotation will have a stirring effect on the paint in the paint pan, causing the air to come into full contact with the paint, which can easily lead to the oxidation and deterioration of the paint.

[0037] In contrast, in this case, the paint is surging towards the feed roller, and the surging paint adheres to the feed roller and participates in the subsequent coating process. Therefore, the problem of "driving air into full contact with the paint, which easily leads to the oxidation and deterioration of the paint" does not exist.

[0038] Technical effect 4: In this case, the gap between the inner pool of the material supply and the rectangular outer shell will only be opened during the coating operation, that is, the paint bottom pool will be opened. At other times (including but not limited to replacing new aluminum materials and when the equipment stops running, etc.), the paint bottom pool will automatically close to isolate the outside air and prevent the paint from being oxidized and deteriorated. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the present invention;

[0040] Figure 2 This is a cross-sectional view of the coating assembly and paint tray assembly;

[0041] Figure 3 Schematic diagram of coating assembly and paint tray assembly Figure 1 ;

[0042] Figure 4 Schematic diagram of coating assembly and paint tray assembly Figure 2 ;

[0043] Figure 5 This is a schematic diagram of the side support, slide, and counterweight.

[0044] Figure 6 Schematic diagram of paint tray assembly Figure 1 ;

[0045] Figure 7 Schematic diagram of paint tray assembly Figure 2 ;

[0046] Figure 8 This is a cross-sectional view of the paint tray assembly.

[0047] The labels in the attached diagram are:

[0048] 100. Frame; 200. Coating assembly; 201. Back coating roller; 202. Feed roller; 2021. Rubber protrusion; 203. Lifting roller; 204. Scraper roller; 205. Coating roller; 206. Main motor; 207. First linear module; 208. Movable support; 209. Power transmission component; 210. Side support; 211. Power connection component; 2111. Drive pulley; 2112. Driven pulley; 2113. Pressure pulley; 2114. Slide; 212. Second linear module Line module; 213, First movable seat; 214, Third linear module; 215, Second movable seat; 216, Connecting rope; 217, Counterweight; 300, Paint tray assembly; 301, Paint bottom tank; 302, V-shaped shell; 303, Feeding inner tank; 304, Feeding nozzle; 305, Agitator; 306, Peristaltic pump one; 3061, Liquid replenishment pipe; 307, Peristaltic pump two; 3071, Connecting pipe one; 3072, Connecting pipe two; 308, Liquid level sensor; 309, Float valve. Detailed Implementation

[0049] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0050] In the attached diagram of this plan, 'a' refers to aluminum material.

[0051] Reference Figures 1-8 A four-roller coating equipment for aluminum processing includes a frame 100, on which a coating component 200 and a paint tray component 300 are mounted.

[0052] Painting component 200:

[0053] Reference Figures 2-5The coating assembly 200 includes a back coating roller 201, a material lifting roller 203, a scraper roller 204, and a coating roller 205. These four rollers are existing technologies, and their respective functions will not be described in detail.

[0054] The frame 100 is equipped with a movable support 208 and a first linear module 207 for driving the movable support 208 to move. The moving direction of the movable support 208 is arranged horizontally and perpendicular to the axial direction of the back coating roller 201.

[0055] The movable bracket 208 is provided with mounting components, which include a first movable seat 213 and a second linear module 212 for driving the first movable seat 213 to move. The moving direction of the first movable seat 213 is parallel to the moving direction of the movable bracket 208. Two mounting components are provided along the moving direction of the first movable seat 213.

[0056] The back coating roller 201 is mounted on the frame 100, the lifting roller 203 is mounted on the movable bracket 208, and the scraper roller 204 and the coating roller 205 are respectively mounted on the first movable seats 213 of the two mounting parts. The scraper roller 204 and the coating roller 205 are located on both sides of the lifting roller 203, and the coating roller 205 is close to the back coating roller 201. It should be noted that the back coating roller 201 is used to support the aluminum material and pull it forward smoothly. The relevant structure can be achieved by existing technology and will not be described in detail.

[0057] The main motor 206 is installed on the movable support 208, and the main motor 206 is connected to the input end of the lifting roller 203 through the power transmission component 209.

[0058] The material lifting roller 203, the scraper roller 204 and the coating roller 205 are connected by a power connector 211.

[0059] Specifically, a side support 210 is provided on one side of the movable support 208, a slide block 2114 is slidably installed on the side support 210, a connecting rope 216 is provided at the bottom of the slide block 2114, and a counterweight block 217 is provided at the end of the connecting rope 216.

[0060] The power connector 211 includes a drive pulley 2111 disposed at the end of the lifting roller 203, two driven pulleys 2112 disposed at the ends of the scraper roller 204 and the coating roller 205 respectively, a pressure pulley 2113 disposed on the side support 210, and a synchronous belt disposed between the drive pulley 2111, the driven pulleys 2112 and the pressure pulley 2113. When the second linear module 212 drives the first movable seat 213 to move and change the distance between the lifting roller 203 and the scraper roller 204 or the coating roller 205, the presence of the counterweight 217 ensures that the synchronous belt remains taut, that is, the power connector 211 maintains a power connection. In addition, compared with the spring compression technology commonly used in the prior art, the compression method of the counterweight 217 in this case can keep the compression force consistent.

[0061] The linear modules mentioned in this case can all be implemented using existing lead screw linear motion technology, so they will not be elaborated further.

[0062] Paint tray assembly 300:

[0063] Reference Figures 6-8 The paint tray assembly 300 includes a paint tank 301 mounted on a movable support 208. The upper opening of the paint tank 301 is provided with a tank cover. A stirring element 305 is provided at the bottom of the paint tank 301. The stirring element 305 uses existing stirring blade rotation stirring technology to stir the paint in the tank to prevent sedimentation.

[0064] The end face of the pool cover is provided with an opening, and a rectangular shell is provided at the opening. A V-shaped shell 302 is provided at the upper opening end of the rectangular shell. Furthermore, the distance between the two sides of the V-shaped shell 302 along the moving direction of the movable support 208 increases from bottom to top.

[0065] The rectangular outer shell is provided with a feeding inner pool 303, and the upper surface of the feeding inner pool 303 is provided with a feeding nozzle, and a feeding tip 304 extends from the opening of the feeding nozzle.

[0066] The movable support 208 is provided with a second movable seat 215 and a third linear module 214 for driving the second movable seat 215 to move in the vertical direction. The second movable seat 215 is equipped with a feeding roller 202 located below the lifting roller 203 and parallel to the lifting roller 203. Furthermore, the feeding roller 202 is located inside the V-shaped shell 302 and close to the feeding nozzle 304. The outer circular surface of the feeding roller 202 is provided with a semi-circular rubber protrusion 2021. Several rubber protrusions 2021 are arranged in an array along the circumference of the feeding roller 202.

[0067] The paint tray assembly 300 also includes two peristaltic pumps: peristaltic pump 1 306 and peristaltic pump 2 307.

[0068] The input end of the peristaltic pump 306 is connected to the storage tank for storing paint, and the output end is equipped with a replenishment pipe 3061. The end of the replenishment pipe 3061 is connected to the paint bottom tank 301. The peristaltic pump 306 pulls the paint into the paint bottom tank 301 to achieve the purpose of replenishment. Furthermore, the paint level in the paint bottom tank 301 needs to be monitored in real time. Therefore, a level sensor 308 is installed on the tank cover of the paint bottom tank 301. The sensor is a technology that can be implemented in the prior art and will not be described in detail.

[0069] The peristaltic pump 307 has a connecting pipe 3071 at its input end and a connecting pipe 3072 at its output end. The end of connecting pipe 3071 is connected to the paint tank 301, and the end of connecting pipe 3072 is connected to the inner feeding tank 303. The peristaltic pump 307 draws paint from the paint tank 301 into the inner feeding tank 303, increasing the paint level and eventually causing it to overflow from the feeding nozzle 304. Because the width of the feeding nozzle 304 is relatively... The coating material is small and the ejected coating is in thin flakes. Since the feed roller 202 is close to the feed nozzle 304, most of the coating material ejected upward can adhere to the feed roller 202. In other words, most of the coating material supplied to the feed roller 202 can participate in the subsequent coating process. Therefore, the problem mentioned in the background technology that "the lifting roller needs to rotate when picking up the coating material, and the rotation will have a stirring effect on the coating material in the coating tray, and will also cause more coating material to come into contact with the air" does not exist.

[0070] The end face of the pool cover is provided with a guide hole, and a guide rod is installed in the guide hole. The bottom end of the guide rod extends into the paint bottom pool 301 and is provided with a float valve 309. The float valve 309 extends partially into the rectangular outer shell. There are two float valves 309, which are located on both sides of the inner feeding pool 303. When the float valve 309 moves upward, the part of the float valve 309 located inside the rectangular outer shell can contact the outer surface of the inner feeding pool 303 and seal the gap between the inner feeding pool 303 and the rectangular outer shell.

[0071] Furthermore, refer to Figure 3 The end of the feed roller 202 is also provided with a connecting pulley. The synchronous belt passes around the connecting pulley, that is, the power of the main motor 206 can be transmitted to the connecting pulley, so that the feed roller 202 rotates.

[0072] An operating method for a four-roller coating machine for aluminum processing:

[0073] The main motor 206 drives the feeding roller 202, the lifting roller 203, the scraper roller 204, and the coating roller 205 to rotate.

[0074] Meanwhile, the peristaltic pump 307 draws the paint from the paint tank 301 to the inner feed tank 303. As the amount of paint in the inner feed tank 303 increases and the liquid level rises, the paint will eventually flow out from the feed nozzle 304 and adhere to the feed roller 202. The feed roller 202 then transfers the paint to the lifting roller 203, where the scraper roller 204 scrapes off the paint from the lifting roller 203, ensuring that the paint thickness on the lifting roller 203 meets the preset value. The scraped paint eventually flows back to the paint tank 301, and the paint with the preset thickness on the lifting roller 203 is transferred to the coating roller 205, which then transfers it to the aluminum surface, thus achieving the purpose of four-roll coating.

[0075] After a roll of aluminum is coated, the entire equipment needs to be paused to replace the new aluminum and to replenish the coating tank 301 with new coating. Specifically:

[0076] First, peristaltic pump 307 pulls the paint from the inner supply tank 303 back into the bottom paint tank 301. Then, peristaltic pump 306 pulls new paint to replenish the bottom paint tank 301. As the paint level in the bottom paint tank 301 rises, the float valve 309 rises accordingly and eventually seals the gap between the inner supply tank 303 and the rectangular outer shell. It should be noted that the position of the inner supply tank 303 is fixed. Therefore, after the float valve 309 moves up to the preset height, it can seal the gap between the inner supply tank 303 and the rectangular outer shell. Therefore, a liquid level sensor 308 is set to monitor the paint level in the bottom paint tank 301 in real time to ensure that the sealing purpose is successfully achieved.

[0077] After the new aluminum material is replaced, the coating process continues. During the coating process, the paint in the paint tank 301 is drawn into the feed tank 303 by the peristaltic pump 307 and eventually adheres to the feed roller 202. That is, the paint is constantly being consumed. Therefore, when the coating process continues, the paint level in the paint tank 301 will drop, and the blockage of the float valve 309 will be removed.

[0078] This invention indirectly supplies coatings to the lifting roller via a feeding roller placed inside a V-shaped shell. Its technical advantages are:

[0079] Technical effect 1: In the prior art, the paint tank (i.e., paint tray) is generally set to be open so that the lifting roller can be inserted into the paint tray to adhere the paint. The paint in the paint tray will be in direct contact with the outside air and is easily oxidized.

[0080] In contrast, in this case, the feed roller was placed inside a V-shaped shell, creating a narrow channel. Therefore, the paint in the paint tank was not directly exposed to the flowing air, thus preventing further oxidation of the paint.

[0081] Technical effect 2: In this case, a recessed structure is formed between adjacent rubber protrusions on the outer circular surface of the feed roller, which can collect sufficient paint. Moreover, the protrusion structure supported by the rubber material can be squeezed and flattened, making it easier for the paint to be transferred from the feed roller to the lifting roller, thus ensuring effective feeding of the lifting roller.

[0082] Technical effect 3: In the existing technology, when the lifting roller is used to directly extract the paint in the paint tank by rotating, the rotation will have a stirring effect on the paint in the paint pan, causing the air to come into full contact with the paint, which can easily lead to the oxidation and deterioration of the paint.

[0083] In contrast, in this case, the paint is surging towards the feed roller, and the surging paint adheres to the feed roller and participates in the subsequent coating process. Therefore, the problem of "driving air into full contact with the paint, which easily leads to the oxidation and deterioration of the paint" does not exist.

[0084] Technical effect 4: In this case, the gap between the inner pool of the material supply and the rectangular outer shell will only be opened during the coating operation, that is, the paint bottom pool will be opened. At other times (including but not limited to replacing new aluminum materials and when the equipment stops running, etc.), the paint bottom pool will automatically close to isolate the outside air and prevent the paint from being oxidized and deteriorated.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A four-roller coating equipment for aluminum processing, comprising a frame (100), wherein a coating assembly (200) and a paint tray assembly (300) are disposed on the frame (100), characterized in that, A movable support (208) and a first linear module (207) for driving the movable support (208) to move in the horizontal direction are mounted on the frame (100). The paint tray assembly (300) includes a paint tank (301) mounted on a movable support (208). The upper open end of the paint tank (301) is provided with a tank cover. The end face of the tank cover is provided with an opening. A rectangular shell is provided at the opening. A V-shaped shell (302) is provided at the upper open end of the rectangular shell. The distance between the two sides of the V-shaped shell (302) along the moving direction of the movable support (208) increases from bottom to top. A feeding inner tank (303) is provided inside the rectangular shell. A feeding nozzle (304) is provided on the upper surface of the feeding inner tank (303). A feeding spout (304) extends from the opening of the feeding spout. A peristaltic pump (307) is installed between the paint bottom tank (301) and the material supply inner tank (303). The paint tray assembly (300) also includes a feed roller (202) located inside the V-shaped housing (302) and close to the feed nozzle (304). A float valve (309) floats on the surface of the paint liquid in the paint bottom tank (301). The float valve (309) can seal the gap between the inner tank (303) and the rectangular outer shell.

2. The four-roller coating equipment for aluminum processing according to claim 1, characterized in that, The outer surface of the feed roller (202) is provided with semi-circular rubber protrusions (2021), and several rubber protrusions (2021) are arranged in an array along the circumferential direction of the feed roller (202).

3. The four-roller coating equipment for aluminum processing according to claim 1, characterized in that, The bottom of the paint tank (301) is equipped with a stirring component (305).

4. The four-roller coating equipment for aluminum processing according to claim 1, characterized in that, The end face of the pool cover is provided with a guide hole, and a guide rod is installed in the guide hole. The bottom end of the guide rod extends into the paint bottom pool (301) and is connected to the float valve (309). The float valve (309) extends partially into the rectangular shell. There are two float valves (309) and they are located on both sides of the feeding inner pool (303). When the float valve (309) moves upward, the part of the float valve (309) located inside the rectangular shell can contact the outer surface of the feeding inner pool (303) and seal the gap between the feeding inner pool (303) and the rectangular shell.

5. A four-roller coating equipment for aluminum processing according to claim 1 or 4, characterized in that, The paint tray assembly (300) also includes a peristaltic pump (306), the input end of which is connected to the storage tank for storing paint, and the output end is provided with a replenishment pipe (3061), the end of which is connected to the paint bottom tank (301). The peristaltic pump 2 (307) has a connecting pipe 1 (3071) at its input end and a connecting pipe 2 (3072) at its output end. The end of the connecting pipe 1 (3071) is connected to the paint bottom tank (301), and the end of the connecting pipe 2 (3072) is connected to the feeding inner tank (303).

6. The four-roller coating equipment for aluminum processing according to claim 5, characterized in that, A liquid level sensor (308) is installed on the cover of the paint bottom tank (301).

7. The four-roller coating equipment for aluminum processing according to claim 6, characterized in that, The coating assembly (200) includes a back coating roller (201), a lifting roller (203), a scraper roller (204), and a coating roller (205). The movable support (208) is arranged horizontally and perpendicular to the axial direction of the back coating roller (201). The movable bracket (208) is provided with mounting components, which include a first movable seat (213) and a second linear module (212) for driving the first movable seat (213) to move. The moving direction of the first movable seat (213) is parallel to the moving direction of the movable bracket (208). There are two mounting components along the moving direction of the first movable seat (213). The back coating roller (201) is mounted on the frame (100), the lifting roller (203) is mounted on the movable bracket (208), the scraper roller (204) and the coating roller (205) are respectively mounted on the first movable seat (213) of the two mounting parts, and the scraper roller (204) and the coating roller (205) are respectively located on both sides of the lifting roller (203), with the coating roller (205) close to the back coating roller (201). The movable bracket (208) is provided with a second movable seat (215) and a third linear module (214) for driving the second movable seat (215) to move in the vertical direction. The feeding roller (202) is installed on the second movable seat (215), and the feeding roller (202) is parallel to the lifting roller (203) and located below the lifting roller (203).

8. The four-roller coating equipment for aluminum processing according to claim 7, characterized in that, The movable support (208) is equipped with a main motor (206), and the main motor (206) and the input end of the lifting roller (203) are connected by a power transmission component (209); The feeding roller (202), the lifting roller (203), the scraper roller (204) and the coating roller (205) are connected by a power connector (211).

9. A four-roller coating equipment for aluminum processing according to claim 8, characterized in that, A side support (210) is provided on one side of the movable support (208), a slide (2114) is slidably installed on the side support (210), a connecting rope (216) is provided at the bottom of the slide (2114), and a counterweight (217) is provided at the end of the connecting rope (216). The power connection (211) includes a drive pulley (2111) at the end of the lifting roller (203), a connecting pulley at the end of the feeding roller (202), a pressing pulley (2113) on the side support (210), and two driven pulleys (2112) at the ends of the scraper roller (204) and the coating roller (205), respectively. A synchronous belt is provided between the drive pulley (2111), the driven pulleys (2112), the pressing pulley (2113), and the connecting pulley.

10. The operating method of a four-roller coating equipment for aluminum processing as described in claim 8, characterized in that, Includes the following steps: Step 1: The main motor (206) drives the feeding roller (202), lifting roller (203), scraper roller (204) and coating roller (205) to rotate; Meanwhile, the coating in the coating tank (301) is drawn into the feeding tank (303) by the peristaltic pump (307). The coating in the feeding tank (303) increases and the liquid level rises. Eventually, the coating will flow out from the feeding nozzle (304) and adhere to the feeding roller (202). The feeding roller (202) will then transfer the coating to the lifting roller (203). The scraper roller (204) will scrape off the coating on the lifting roller (203) so that the coating thickness on the lifting roller (203) meets the preset value. The scraped coating will eventually flow back into the coating tank (301). The coating on the lifting roller (203) that meets the preset thickness value will be transferred to the coating roller (205) and then transferred to the aluminum surface. Step 2: After one roll of aluminum has been coated, replace it with a new roll of aluminum. At the same time, the paint in the inner supply tank (303) is pulled back to the paint bottom tank (301) by the peristaltic pump two (307), and new paint is pulled into the paint bottom tank (301) by the peristaltic pump one (306). As the liquid level of the paint in the paint bottom tank (301) continues to rise, the float valve (309) floats up and finally seals the gap between the inner supply tank (303) and the rectangular shell. Step 3: After the new aluminum material has been replaced, repeat Step 1.

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