New energy automobile battery liquid cooling plate spraying device and method

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a new energy automobile battery liquid cooling plate spraying device and method.The new energy automobile battery liquid cooling plate spraying device comprises a heating chamber, a spraying chamber located on the right side of the heating chamber and a conveying device penetrating through the heating chamber and the interior of the spraying chamber from left to right, and the conveying device comprises two chain scraper conveyors arranged in parallel; a spraying baffle and a spraying mechanical arm fixedly connected with a spraying gun are arranged in the spraying chamber. The spraying baffle is located above the chain scraper conveyor, a spraying hole penetrating through the spraying baffle vertically is formed in the spraying baffle, and protective covers are arranged on the left side and the right side of the spraying baffle. Wherein the bottom of one chain scraper conveyor is in sliding connection with a sliding rail arranged in the front-back direction, and the other chain scraper conveyor is connected with a lifter driving the chain scraper conveyor to ascend and descend. According to the spraying device, materials cannot be sprayed to the bottoms of the chain scraper conveyor and the spraying chamber; and the top of the liquid cooling plate can be kept horizontal in the conveying process.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and specifically to a spraying device and method for a liquid cooling plate of a new energy vehicle battery. Background Art

[0002] The liquid cooling plate of a new energy battery is a thermal management component used for the power battery or energy storage battery of an electric vehicle, and realizes temperature control of the battery working environment through liquid cooling technology; polyurethane needs to be sprayed on the surface of the liquid cooling plate of the new energy battery. The functions of spraying polyurethane are as follows: First, polyurethane has excellent insulation performance, which can effectively prevent internal short circuits of the battery and improve the safety of the battery; second, the weather resistance and corrosion resistance of polyurethane enable the battery to maintain stable performance in harsh environments; in addition, polyurethane also has good elasticity and buffering performance, which can effectively absorb the stress generated during the charging and discharging process of the battery and extend the service life of the battery.

[0003] The patent with the application number 202420364555.3 discloses a regional modular surface spraying system, including a heating device, a spraying device, and a workpiece conveying device. The heating device includes a heating chamber, and the spraying device includes a spraying chamber. The heating chamber is located to the left of the spraying chamber. Openings are provided at the left and right ends of the heating chamber and the spraying chamber. The left end of the workpiece conveying device is located to the left of the heating chamber, the right end is located to the right of the spraying chamber, and the middle part passes through the interiors of the heating chamber and the spraying chamber; the workpiece conveying device includes a first chain conveyor, a roller conveyor, and a second chain conveyor arranged in sequence from left to right. The roller conveyor is located inside the spraying chamber, and the right part of the first chain conveyor is located inside the heating chamber; it can realize spraying of high polymers such as polyurethane on the surface of the workpiece.

[0004] The disadvantages of the patent solution with the application number 202420364555.3 are as follows: 1. The workpiece conveying device uses a roller conveyor and a chain conveyor. If the bottom of the workpiece is uneven, the surface of the workpiece will tilt, resulting in uneven spraying; 2. The materials sprayed outside the workpiece will adhere to the roller conveyor and enter the bottom of the spraying chamber; the materials adhering to the roller conveyor will affect the cleaning of the conveyor and affect the use of the roller conveyor; the materials entering the water at the bottom of the spraying chamber will cause pollution to the circulating water, and the circulating water needs to be frequently replaced; 3. The bottom of the heating chamber is entirely a chain conveyor, with poor sealing performance and poor heat preservation effect. Summary of the Invention

[0005] The main purpose of the present invention is to provide a spraying device and method for a liquid cooling plate of a new energy vehicle battery, so as to solve the problems in the above-mentioned prior art that the spraying is uneven when spraying polyurethane on workpieces with uneven bottoms, the materials sprayed outside the workpiece affect the use of the roller conveyor, cause pollution to the circulating water, and the heat preservation effect of the heating chamber is poor.

[0006] To achieve the above object, the present invention provides a spraying device for a battery liquid cooling plate of a new energy vehicle, including a heating chamber, a spraying chamber located on the right side of the heating chamber, and a conveying device passing through the inside of the heating chamber and the spraying chamber from left to right. The conveying device includes two chain plate conveyors arranged in parallel; a spraying baffle and a spraying robot arm fixedly connected with a spray gun are arranged inside the spraying chamber; the spraying baffle is located above the chain plate conveyor, spraying holes penetrating through the upper and lower parts are provided on the spraying baffle, and protective covers are arranged on the left and right sides of the spraying baffle.

[0007] Further, the bottom of one of the chain plate conveyors is slidably connected with a slide rail arranged in the front-back direction, and the other chain plate conveyor is connected with a lift for driving the chain plate conveyor to lift.

[0008] Further, a second cotton curtain for preventing heat from dissipating downward is fixedly connected between the side of the chain plate conveyor connected with the slide rail and the inner wall of the spraying chamber, and a vertical rod is fixedly connected to the top. A third cotton curtain for preventing heat from dissipating to the left is fixedly connected between the vertical rod and the inner wall of the spraying chamber.

[0009] Further, a rack parallel to the slide rail is arranged on one side of the slide rail, and a rotating shaft is rotatably connected to the bottom of the chain plate conveyor through a bearing; a gear is fixedly connected to the rotating shaft, the gear meshes with the rack, and the rotating shaft is drivingly connected with a motor.

[0010] Further, two heat preservation plates are arranged in a staggered manner in the up-down direction inside the heating chamber, and the two heat preservation plates are respectively fixedly connected to the tops of the sides of the two chain plate conveyors; one ends of the two heat preservation plates close to each other are connected with a first cotton curtain.

[0011] Further, the left and right ends of the heating chamber are open, sliding grooves are provided at the left and right ends of the heating chamber, and a shielding cover for shielding the opening is slidably connected in the sliding grooves. Bolts for fixing the shielding cover are threadedly connected to the sliding grooves; heating pipes are arranged inside the heating chamber.

[0012] Further, a water curtain chamber is communicated with the rear side of the spraying chamber. An arc-shaped water curtain wall protruding forward and a water receiving tank located below the water curtain wall are arranged inside the water curtain chamber; saw teeth are provided at the bottom of the water curtain wall; one end of a circulation pipe is connected to the water receiving tank, a circulation pump is connected to the circulation pipe, and the other end of the circulation pipe is connected to a water spraying pipe; the water spraying pipe is located at the front side of the top of the water curtain wall, and a plurality of spray nozzles facing the water curtain wall are provided on the water spraying pipe.

[0013] Further, an air outlet is arranged behind the water curtain wall, the air outlet is connected with an air outlet pipe, and an activated carbon filter and a suction fan are connected to the air outlet pipe.

[0014] Further, a heat preservation chamber is arranged on the right side of the spraying chamber, the conveying device passes through the heat preservation chamber from left to right, and the heat preservation chamber has the same structure as the heating chamber.

[0015] The present invention also provides a method for spraying a battery liquid cooling plate of a new energy vehicle. Using the above-mentioned spraying device for the battery liquid cooling plate of a new energy vehicle, it includes the following steps: S1. Adjust the distance between the two chain conveyors in the front-back direction, place the battery liquid cooling plate of the new energy vehicle, with both ends of the liquid cooling plate abutted against the chain conveyors respectively, and adjust the height of the chain conveyors so that the top surface of the battery liquid cooling plate of the new energy vehicle remains horizontal; S2. The two chain conveyors move synchronously to convey the liquid cooling plate to the heating chamber and heat the surface temperature of the liquid cooling plate to 40 - 50 °C; S3. Convey the liquid cooling plate to the spraying chamber, and the spraying robotic arm drives the spray gun to spray polyurethane; when spraying, the spray gun first tilts forward by 45° to spray one layer, then tilts backward by 45° to spray one layer, then tilts left by 45° to spray one layer, and finally tilts right by 45° to spray one layer to complete a spraying cycle; repeat the above spraying cycle process until the specified spraying thickness is reached; S4. Convey the liquid cooling plate to the insulation chamber, and the insulation chamber heats the sprayed surface to keep the sprayed surface at 30 - 35 °C; the residence time of the liquid cooling plate in the insulation chamber is 4 times the residence time during the spraying process in the spraying chamber; S5. Convey the liquid cooling plate to the right end of the chain conveyor and unload the liquid cooling plate.

[0016] The beneficial effects of the present invention are as follows: By providing a spraying baffle and a protective cover, most of the materials sprayed outside the workpiece will adhere to the spraying baffle, and a small part will adhere to the protective cover, and will not be sprayed onto the bottom of the chain conveyor and the spraying chamber; thus, it avoids affecting the use of the conveyor, avoids water pollution, and saves water resources.

[0017] By providing two chain conveyors, a lift and a slide rail, the distance between the two chain conveyors and the height of one of the chain conveyors can be adjusted according to the length and height difference of the liquid cooling plate; when placing the battery liquid cooling plate of the new energy vehicle to be sprayed, only both ends are in contact with the chain conveyors; even if the bottom of the liquid cooling plate is uneven, the height of the chain conveyor can be adjusted to keep the top of the liquid cooling plate horizontal during transportation, so that the surface of the liquid cooling plate is evenly sprayed.

[0018] By providing a heat preservation board, most of the bottom of the heating chamber can be a heat preservation board, and only the two sides of the heating chamber are chain conveyors, so the heat preservation effect is better.

[0019] By heating the surface temperature of the liquid cooling plate to 40 - 50 °C before heating, the bonding strength between the polyurethane coating and the liquid cooling plate can be improved; by conveying the sprayed liquid cooling plate to the heating chamber for heat preservation for a period of time, it is beneficial to the rapid curing of the polyurethane coating.

[0020] The present invention completes the spraying cycle by tilting the spray gun in different directions, enabling the grooves on the surface of the liquid cooling plate to be fully sprayed without dead angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0022] Figure 1 It is a schematic structural diagram of a spraying device for a new energy vehicle battery liquid cooling plate in an embodiment; Figure 2 It is a schematic structural diagram at the spraying baffle in an embodiment; Figure 3 It is a schematic structural diagram of the left end of a spraying device for a new energy vehicle battery liquid cooling plate in an embodiment; Figure 4 It is a schematic structural diagram at the gear in an embodiment; Figure 5 It is a front view schematic structural diagram at the water curtain chamber in an embodiment; Figure 6 It is a side view schematic structural diagram inside the water curtain chamber in an embodiment; Figure 7 It is a schematic structural diagram at the heat preservation chamber in an embodiment; Figure 8 It is a schematic structural diagram at the elevator in an embodiment; In the figure: 1. Heating chamber; 2. Spraying chamber; 3. Chain plate conveyor; 4. Spraying robotic arm; 5. Coating baffle; 501. Spraying holes; 6. Protective cover; 7. Slide rail; 8. Elevator; 9. Heat preservation board; 10. First cotton curtain; 11. Rack; 12. Second cotton curtain; 13. Vertical rod; 14. Chute; 15. Shading cover; 16. Bolt; 17. Water curtain chamber; 1701. Air outlet; 18. Water curtain wall; 19. Water receiving tank; 20. Circulation pipe; 21. Spray water pipe; 22. Air outlet pipe; 23. Activated carbon filter; 24. Exhaust fan; 25. Rotating shaft; 26. Gear; 27. Heat preservation chamber; 28. Third cotton curtain. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] As Figures 1 to 8As shown, according to an embodiment of the present invention, a new energy vehicle battery liquid cooling plate spraying device is provided, comprising a heating chamber 1, a spraying chamber 2 located on the right side of the heating chamber 1, and a conveying device passing through the heating chamber 1 and the spraying chamber 2 from left to right, the conveying device comprising two parallel chain conveyors 3; the width of a single chain conveyor 3 is 420 mm, and the spacing between the two chain conveyors 3 in the front-to-back direction is 800 mm-1960 mm, which can be slidably adjusted according to the length of the liquid cooling plate; a spraying baffle 5 and a spraying mechanical arm 4 fixedly connected with a spray gun are arranged inside the spraying chamber 2; the spraying baffle 5 is located above the chain conveyor 3, and a spraying hole 501 is provided on the spraying baffle 5 running through it from top to bottom; the shape of the spraying hole 501 is the same as the shape of the new energy vehicle battery liquid cooling plate to be sprayed, and the size is slightly larger than the new energy vehicle battery liquid cooling plate, and the spraying baffle 5 can be replaced according to the change of the new energy vehicle battery liquid cooling plate to be sprayed; protective covers 6 are arranged on the left and right sides of the spraying baffle 5.

[0025] The bottom of one of the chain conveyors 3 is slidably connected to a slide rail 7 arranged along the front-to-back direction, and the other chain conveyor 3 is connected to a lifter 8 that drives the chain conveyor 3 to rise and fall; the lifter 8 is a worm gear screw lifter, and there are multiple lifters 8, and the multiple lifts 8 are transmission-connected to a linkage shaft, and the linkage shaft is transmission-connected to a motor.

[0026] A second cotton curtain 12 is fixedly connected between the side of the chain conveyor 3 connected to the slide rail 7 and the inner wall of the spray chamber 2 to prevent heat loss to the downward direction, a vertical rod 13 is fixedly connected to the top, and a third cotton curtain 28 is fixedly connected between the vertical rod 13 and the inner wall of the spray chamber 2 to prevent heat loss to the left.

[0027] A rack 11 parallel to the slide rail 7 is provided on one side of the slide rail 7, and a rotating shaft 25 is rotatably connected to the bottom of the chain conveyor 3 through a bearing; a gear 26 is fixedly connected to the rotating shaft 25, the gear 26 is meshed with the rack 11, and the rotating shaft 25 is transmission-connected to a motor.

[0028] Two insulation plates 9 are staggered in the upper and lower directions inside the heating chamber 1, and the two insulation plates 9 are fixedly connected to the top of the sides of the two chain conveyors 3 respectively; the ends of the two insulation plates 9 close to each other are connected to the first cotton curtain 10; the function of the first cotton curtain 10 is to reduce the heat loss caused by the gap between the two insulation plates 9, and not affect the movement between the two insulation plates 9.

[0029] The left and right ends of the heating chamber 1 are open. Sliding grooves 14 are provided at the left and right ends of the heating chamber 1. A shielding cover 15 for shielding the opening is slidably connected in the sliding grooves 14. A bolt 16 for fixing the shielding cover 15 is threadedly connected to the sliding grooves 14. The function of the shielding cover 15 is to reduce the heat dissipation from the left and right ends of the heating chamber 1. The shielding area of the shielding cover 15 can be adjusted up and down according to the size of the liquid cooling plate of the new energy vehicle battery. Heating pipes are arranged in the heating chamber 1.

[0030] The rear side of the spraying chamber 2 communicates with a water curtain chamber 17. An arc-shaped water curtain wall 18 protruding forward and a water receiving tank 19 located below the water curtain wall 18 are arranged in the water curtain chamber 17. The water curtain wall 18 is arranged in an arc shape, which can increase the area of the water curtain, and then can increase the contact surface of the water curtain with the dust pollutants generated by spraying. After the dust pollutants contact the water curtain, they fall downward with the water into the water receiving tank 19. Sawteeth 1801 are provided at the bottom of the water curtain wall 18. The setting of the sawteeth 1801 can reduce the splashing when the water falls into the water receiving tank 19 and make it fall more evenly. One end of a circulating pipe 20 is connected to the water receiving tank 19. A circulating pump is connected to the circulating pipe 20. The other end of the circulating pipe 20 is connected to a water spraying pipe 21. The water spraying pipe 21 is located at the front side of the top of the water curtain wall 18. A plurality of spray nozzles facing the water curtain wall 18 are provided on the water spraying pipe 21. Water is sprayed from the spray nozzles onto the water curtain wall 18 to form a water curtain.

[0031] An air outlet 1701 is provided behind the water curtain wall 18. The air outlet 1701 is connected to an air outlet pipe 22. An activated carbon filter 23 and a suction fan 24 are connected to the air outlet pipe 22.

[0032] In some embodiments, a heat preservation chamber 27 is provided on the right side of the spraying chamber 2. The conveying device passes through the heat preservation chamber 27 from left to right. The heat preservation chamber has the same structure as the heating chamber 1.

[0033] This embodiment also provides a spraying method for the liquid cooling plate of a new energy vehicle battery. Using the above-mentioned spraying device for the liquid cooling plate of a new energy vehicle battery, it includes the following steps: S1. Adjust the distance between the two chain plate conveyors 3 in the front-rear direction, place the liquid cooling plate of the new energy vehicle battery, and the two ends of the liquid cooling plate respectively abut against the chain plate conveyors 3. Adjust the height of the chain plate conveyors 3 to keep the top surface of the liquid cooling plate of the new energy vehicle battery horizontal. S2. The two chain plate conveyors 3 move synchronously, convey the liquid cooling plate to the heating chamber 1, and heat the surface temperature of the liquid cooling plate to 40 - 50 °C. S3. Convey the liquid cooling plate to the spraying chamber 2, and the spraying robotic arm 4 drives the spray gun to spray polyurethane. When spraying, the spray gun first tilts forward by 45° to spray a layer, then tilts backward by 45° to spray a layer, then tilts left by 45° to spray a layer, and finally tilts right by 45° to spray a layer to complete a spraying cycle. Repeat the above spraying cycle process until the specified spraying thickness is reached. S4. Transport the liquid cooling plate to the heat preservation chamber 27. The heat preservation chamber 27 heats the spraying surface to keep the spraying surface at 30 - 35°C. The residence time of the liquid cooling plate in the heat preservation chamber (27) is 4 times the residence time during the spraying process in the spraying chamber (2). S5. Transport the liquid cooling plate to the right end of the chain conveyor 3 and unload the liquid cooling plate.

[0034] In the above embodiment, by setting the spraying baffle and the protective cover, most of the materials sprayed outside the workpiece will adhere to the spraying baffle, and a small part will adhere to the protective cover, and will not be sprayed onto the bottom of the chain conveyor and the spraying chamber; thus, it avoids affecting the use of the conveyor, avoids water pollution, and saves water resources.

[0035] In the above embodiment, by setting 2 chain conveyors, a lift, and a slide rail, the distance between the 2 chain conveyors can be adjusted through the slide rail according to the different lengths and height differences of the liquid cooling plate, and the height of one of the chain conveyors can be adjusted through the lift; when placing the liquid cooling plate for a new energy vehicle battery to be sprayed, only the two ends are in contact with the chain conveyor; even if the bottom of the liquid cooling plate is uneven, the height of the chain conveyor can be adjusted to keep the top of the liquid cooling plate horizontal during transportation, so that the surface of the liquid cooling plate is evenly sprayed.

[0036] In the above embodiment, by setting the heat preservation board, most of the bottom of the heating chamber is the heat preservation board, and only the two sides of the heating chamber are the chain conveyors, so the heat preservation effect is better.

[0037] In the above embodiment, by heating the surface temperature of the liquid cooling plate to 40 - 50°C before heating, the bonding strength between the polyurethane coating and the liquid cooling plate can be improved; by transporting the sprayed liquid cooling plate to the heating chamber and keeping it warm for a period of time, it is beneficial to the rapid curing of the polyurethane coating.

[0038] In the above embodiment, by tilting the spray gun in different directions to complete the spraying cycle, the grooves on the surface of the liquid cooling plate can also be fully sprayed without dead angles.

[0039] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A spraying device for a battery liquid cooling plate of a new energy vehicle, comprising a heating chamber (1), a spraying chamber (2) located on the right side of the heating chamber (1), and a conveying device passing through the interiors of the heating chamber (1) and the spraying chamber (2) from left to right, characterized in that, The conveying device includes two chain plate conveyors (3) arranged in parallel; inside the spraying chamber (2), there are spraying baffles (5) and a spraying robotic arm (4) fixedly connected with a spray gun; the spraying baffle (5) is located above the chain plate conveyor (3), the spraying baffle (5) is provided with spraying holes (501) penetrating through its upper and lower sides, and protective covers (6) are arranged on the left and right sides of the spraying baffle (5).

2. The spraying device for the battery liquid cooling plate of a new energy vehicle according to claim 1, wherein, The bottom of one of the chain plate conveyors (3) is slidably connected with a slide rail (7) arranged in the front - rear direction, and the other chain plate conveyor (3) is connected with a lifter (8) that drives the chain plate conveyor (3) to lift and lower.

3. The new energy vehicle battery liquid cooling plate spraying device according to claim 2, wherein, Between the side of the chain plate conveyor (3) connected to the slide rail (7) and the inner wall of the spraying chamber (2), a second cotton curtain (12) for preventing heat from dissipating downward is fixedly connected, and a vertical rod (13) is fixedly connected to the top. Between the vertical rod (13) and the inner wall of the spraying chamber (2), a third cotton curtain (28) for preventing heat from dissipating to the left is fixedly connected.

4. The spraying device for the battery liquid cooling plate of a new energy vehicle according to claim 2, wherein On one side of the slide rail (7), there is a rack (11) parallel to the slide rail (7). The bottom of the chain plate conveyor (3) is rotatably connected with a rotating shaft (25) through a bearing; a gear (26) is fixedly connected to the rotating shaft (25), the gear (26) meshes with the rack (11), and the rotating shaft (25) is drivingly connected with a motor.

5. The spraying device for the battery liquid cooling plate of a new energy vehicle according to claim 1, characterized in that, Inside the heating chamber (1), two heat - insulating plates (9) are arranged in a staggered manner in the up - down direction. The two heat - insulating plates (9) are respectively fixedly connected to the tops of the sides of the two chain plate conveyors (3); one ends of the two heat - insulating plates (9) close to each other are connected with a first cotton curtain (10).

6. The new energy vehicle battery liquid cooling plate spraying device according to claim 1, wherein, Both the left and right ends of the heating chamber (1) are open. There are sliding grooves (14) at the left and right ends of the heating chamber (1), and a shielding cover (15) for covering the opening is slidably connected in the sliding grooves (14). A bolt (16) for fixing the shielding cover (15) is threadedly connected to the sliding grooves (14); heating pipes are arranged inside the heating chamber (1).

7. The spraying device for the battery liquid cooling plate of a new energy vehicle according to claim 1, wherein, The rear side of the spraying chamber (2) is communicated with a water curtain chamber (17). Inside the water curtain chamber (17), there is an arc - shaped water curtain wall (18) protruding forward and a water receiving tank (19) located below the water curtain wall (18); sawteeth (1801) are provided at the bottom of the water curtain wall (18); one end of a circulation pipe (20) is connected to the water receiving tank (19), a circulation pump is connected to the circulation pipe (20), and the other end of the circulation pipe (20) is connected to a water spray pipe (21); the water spray pipe (21) is located at the front side of the top of the water curtain wall (18), and a plurality of spray nozzles facing the water curtain wall (18) are provided on the water spray pipe (21).

8. The spraying device for the battery liquid cooling plate of a new energy vehicle according to claim 7, characterized in that, An air outlet (1701) is provided behind the water curtain wall (18), the air outlet (1701) is connected with an air outlet pipe (22), and an activated carbon filter (23) and a suction fan (24) are connected to the air outlet pipe (22).

9. The spraying device for the battery liquid cooling plate of a new energy vehicle according to claim 1, wherein, A heat - insulating chamber (27) is provided on the right side of the spraying chamber (2). The conveying device passes through the heat - insulating chamber (27) from left to right, and the heat - insulating chamber has the same structure as the heating chamber (1).

10. A spraying method for a battery liquid cooling plate of a new energy vehicle, characterized in that, Using the new energy vehicle battery liquid cooling plate spraying device in claim 9, the following steps are included S1. Adjust the distance between the two chain plate conveyors (3) in the front-rear direction, place the new energy vehicle battery liquid cooling plate, with both ends of the liquid cooling plate respectively abutting against the chain plate conveyors (3), and adjust the height of the chain plate conveyors (3) so that the top surface of the new energy vehicle battery liquid cooling plate is kept horizontal; S2. The two chain plate conveyors (3) move synchronously to convey the liquid cooling plate to the heating chamber (1) and heat the surface temperature of the liquid cooling plate to 40 - 50 °C; S3. Convey the liquid cooling plate to the spraying chamber (2), and the spraying robotic arm (4) drives the spray gun to spray polyurethane; when spraying, the spray gun first tilts forward by 45° to spray a layer, then tilts backward by 45° to spray a layer, then tilts left by 45° to spray a layer, and finally tilts right by 45° to spray a layer to complete a spraying cycle; repeat the above spraying cycle process until the specified spraying thickness is reached; S4. Convey the liquid cooling plate to the insulation chamber (27), and the insulation chamber (27) heats the sprayed surface to keep the sprayed surface at 30 - 35 °C; the residence time of the liquid cooling plate in the insulation chamber (27) is 4 times the residence time during the spraying process in the spraying chamber (2); S5. Convey the liquid cooling plate to the right end of the chain plate conveyor (3) and unload the liquid cooling plate.

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