Steel structure paint spraying device and paint spraying method

Abstract

The invention provides a steel structure paint spraying device and a paint spraying method.The steel structure paint spraying device comprises a machining channel fixedly installed above a support, a circulating channel is arranged in the middle of the machining channel, and the parts, located on the two sides of the circulating channel, of the machining channel are sequentially provided with a cleaning channel, a drying channel and a paint spraying channel from inside to outside; the upper half section of the belt conveyor penetrates through the circulating channel, a plurality of pairs of telescopic arms are fixedly installed on the surface of the belt conveyor at intervals, the telescopic directions of each pair of telescopic arms are opposite and are perpendicular to the conveying direction, electromagnetic suction plates are detachably installed at the telescopic ends of the telescopic arms, and the electromagnetic suction plates are used for magnetically sucking the back faces of the color steel plates. According to the device, the cleaning channel, the drying channel and the paint spraying channel are arranged in parallel, the mode that a color steel plate is magnetically attracted and circularly stretches out and draws back is adopted, the occupied area is small, the cleaning-drying-paint spraying-drying process of the color steel plate can be automatically completed, and automatic feeding and discharging can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of spray painting, and in particular to a steel structure spray painting device and a spray painting method. Background Art

[0002] Color steel plate refers to color-coated steel plate, which is a steel plate with an organic coating. Color steel plate is divided into single plate, color steel composite plate, floor decking plate, etc. It is widely used in the walls and roofs of large public buildings, public factories, mobile houses, and integrated houses.

[0003] Color-coated steel plates need to be surface-painted after stamping. Currently, the painting process is mostly in the form of a long channel, and after painting, it is necessary to connect to a long drying channel. The entire painting system is long, occupies a large area, and requires manual hanging and removal of color-coated steel plates, which is a heavy workload. Summary of the invention

[0004] In response to the above problems, the present invention provides a steel structure painting device and a painting method. The device sets a cleaning channel, a drying channel and a painting channel in parallel, adopts a magnetic suction color steel plate and a cyclic extension method, occupies a small area, can automatically complete the color steel plate cleaning-drying-painting-drying process, and can also realize automatic loading and unloading.

[0005] To solve the above problems, the technical solution adopted by the present invention is:

[0006] A steel structure painting device comprises a processing channel fixedly installed above a bracket, a circulation channel is arranged in the middle of the processing channel, a cleaning channel, a drying channel and a painting channel are arranged on both sides of the circulation channel from the inside to the outside, a belt conveyor is installed on the bracket, the upper half of the belt conveyor passes through the circulation channel, and a plurality of pairs of telescopic arms are fixedly installed at intervals on the surface of the belt conveyor, and the telescopic directions of each pair of telescopic arms are opposite and perpendicular to the conveying direction, and an electromagnetic suction plate is detachably installed at the telescopic end of the telescopic arm, and the electromagnetic suction plate is used to magnetically absorb the back of the color steel plate, and the cleaning The channel, drying channel, paint spraying channel and circulation channel are separated by partitions, and the side wall of the partition is provided with a connecting port for the telescopic end of the telescopic arm to pass through, and an air wall partition mechanism is installed in the connecting port, and the top of the cleaning channel, drying channel and paint spraying channel are respectively fixedly installed with a flushing water pipe, a drying air duct and a paint spraying pipe, and the top of the feeding end of the processing channel is fixedly installed with a mounting plate, and the bottom of the mounting plate is provided with a mounting groove, and a pair of sliders are slidably installed in the mounting groove, and the bottom of the slider is installed with a lifting pneumatic clamp, and the pneumatic clamp is used to clamp the telescopic end of the corresponding telescopic arm.

[0007] Preferably, support rails are fixed on both sides of the belt conveyor in the circulation channel, the shape of the support rails is consistent with the conveying path of the belt conveyor, and the ends of the telescopic arms are slidably connected to the support rails.

[0008] Preferably, the supporting guide rail is a first conductive rail, the electromagnetic suction plate at the telescopic end of the telescopic arm is slidingly electrically connected to the first conductive rail, a second conductive rail is connected in series to the right side of the bottom of the supporting guide rail, a unloading belt conveyor is installed below the second conductive rail, and the second conductive rail is externally connected to a controller.

[0009] Preferably, a plurality of water spray heads are provided at the bottom of the flushing water pipe, a plurality of air outlet holes are provided at the bottom of the drying air duct, and a plurality of paint spray heads are provided at the bottom of the paint spray pipe.

[0010] Preferably, both ends of the cleaning channel, the drying channel, the paint spraying channel, the circulation channel and the connecting port are open.

[0011] Preferably, the air cavity partition mechanism includes an air blowing duct arranged at the top of the connecting port, a air blowing pipe is provided in the top of the partition, a plurality of air blowing holes connected to the air blowing duct are provided at the bottom of the air blowing pipe, and an air outlet duct is provided below the corresponding connecting port on the partition.

[0012] Preferably, the bottom of the cleaning channel, drying channel and paint spraying channel are respectively provided with a drain port, an exhaust port and a paint discharge port. The bottom of the cleaning channel is equipped with a drainage channel connected with the drain port, and the bottom of the paint spraying channel is equipped with a paint discharge channel connected with the paint discharge port. The air outlet ducts on both sides of the cleaning channel are connected with the drainage channel, and the air outlet duct on one side of the paint spraying channel is connected with the paint discharge channel.

[0013] Preferably, a double-headed screw is rotatably connected in the mounting groove, a pair of sliders are respectively threadedly connected to the two ends of the double-headed screw, a vertical cylinder is staggered and fixedly installed at the bottom of the two sliders, the pneumatic clamp is fixedly installed at the telescopic end of the cylinder, and a motor that can drive the double-headed screw to rotate is installed at the end of the mounting plate.

[0014] Preferably, a hydraulic cylinder is fixedly installed on the left side of the bracket, a connecting frame is fixedly installed on the telescopic end of the hydraulic cylinder, a loading platform is fixedly installed on both ends of the connecting frame, a material trough is provided on the loading platform for pushing the color steel plate into, a plurality of convex strips adapted to the concave and convex sections of the color steel plate are fixed in the material trough, a plurality of grooves adapted to the concave and convex sections of the color steel plate are provided on the surface of the electromagnetic suction plate, and conveyors for feeding the color steel plate into the material trough are installed on the front and rear sides of the bracket.

[0015] The present invention also provides a steel structure painting method, comprising the following steps:

[0016] S1. The color steel plates are intermittently transported by a pair of conveyors. The color steel plates are pushed onto the loading platform, and the hydraulic cylinder is started to push the two color steel plates upward to the corresponding electromagnetic suction plates. After magnetic suction, they are transported by the belt conveyor;

[0017] S2. When conveying to the feeding port of the processing channel, start a pair of air cylinders to drive the pneumatic clamps to move down and clamp the telescopic ends of a pair of telescopic arms, start the motor to drive the double-headed screw to rotate, and drive the telescopic ends to move through the movement of a pair of sliders, thereby pulling the magnetically attracted color steel plate to the corresponding cleaning channel position;

[0018] S3, through the cleaning channel, the surface flushing process is completed through the flushing water pipe, and then circulated to the feed port again, the color steel plate is pulled to the corresponding drying channel position through the pneumatic clamp, and the drying process after cleaning is completed through the drying air duct, and then circulated to the feed port, the color steel plate is pulled to the corresponding painting channel position through the pneumatic clamp, and the painting process is completed through the paint spraying pipe and multiple paint spraying heads, and finally circulated through the drying channel to complete the final drying process;

[0019] S4. When circulating to the top of the corresponding unloading belt conveyor, the controller disconnects the circuit of the second conductive rail, disconnects the corresponding electromagnetic suction plate circuit, releases the painted and dried color steel plate, and transports it out through the unloading belt conveyor.

[0020] The beneficial effects of the present invention are:

[0021] 1. By installing a circulation channel, a pair of cleaning channels, a pair of drying channels and a pair of painting channels, and adopting a belt conveyor for circulation transportation, the device sets the cleaning channel, drying channel and painting channel in parallel, and adopts a magnetic suction color steel plate and a circular telescopic method. It occupies a small area and can automatically complete the color steel plate cleaning-drying-painting-drying process. It can also realize automatic loading and unloading, bilateral synchronous cleaning, drying and painting, and has high efficiency.

[0022] 2. By installing the mounting plate, the double-headed threaded rod, a pair of sliders, the cylinder and the pneumatic clamp, when it is transported to the feeding port of the processing channel, start a pair of cylinders to drive the pneumatic clamp to move down and clamp the telescopic end of a pair of telescopic arms, start the motor to drive the double-headed screw to rotate, and drive the telescopic end to move through the movement of a pair of sliders, and then pull the magnetically attracted color steel plate to the corresponding cleaning channel position, pass through the cleaning channel, and complete the surface flushing process through the flushing water pipe, and circulate to the feeding port again, pull the color steel plate to the corresponding drying channel position through the pneumatic clamp, and complete the drying process after cleaning through the drying air duct, continue to circulate to the feeding port, pull the color steel plate to the corresponding paint channel position through the pneumatic clamp, and complete the painting process through the paint spraying pipe and multiple paint spraying heads, and finally circulate through the drying channel to complete the final drying process, and cooperate with the circulation automation to complete the cleaning-drying-painting-drying process.

[0023] 3. By installing an electromagnetic suction plate, a hydraulic cylinder, a loading platform and a pair of conveyors, the color steel plates are intermittently transported by a pair of conveyors, and the color steel plates are pushed into the material trough of the loading platform. Multiple convex strips are stuck in the concave grooves of the color steel plates. The hydraulic cylinder is started to push the two color steel plates upward to the corresponding electromagnetic suction plates. The raised sections of the color steel plates are stuck in the grooves of the electromagnetic suction plates. After magnetic suction, they are transported by the belt conveyor to complete the automatic loading process.

[0024] 4. By installing an electromagnetic suction plate, a support rail, a second conductive rail and a pair of unloading belt conveyors, during the circulation conveying process, the telescopic arm is supported and guided by the support rail, and the first conductive rail is always energized, thereby maintaining the magnetic suction state during the loading, cleaning, drying and painting processes. When it circulates to the top of the corresponding unloading belt conveyor, the circuit of the second conductive rail is disconnected by the controller, the corresponding electromagnetic suction plate circuit is disconnected, the painted and dried color steel plate is released, and it is transported out through the unloading belt conveyor to realize the automatic unloading process.

[0025] 5. By installing the connecting port and the air wall partition mechanism, the setting of the connecting port allows the telescopic end of the telescopic arm to pass normally. During the cleaning, drying and painting process, the blowing pipe blows air into the blowing duct through multiple blowing holes, and the gas in the blowing duct is evenly blown downward into the air outlet duct to form an air wall to avoid mutual influence between water vapor, paint water and hot air. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 A top view of the present invention;

[0028] Figure 3 A bottom view of the mounting plate provided by the present invention;

[0029] Figure 4 for Figure 3 A schematic diagram of the structure enlargement at point A;

[0030] Figure 5 It is a left side view of the present invention;

[0031] Figure 6 It is a schematic diagram of the present invention;

[0032] Figure 7 is a schematic diagram of the present invention;

[0033] Figure 8 It is a schematic diagram of the present invention.

[0034] In the figure: 1 processing channel, 2 painting channel, 3 drying channel, 4 cleaning channel, 5 conveyor, 6 unloading belt conveyor, 7 supporting guide rail, 8 belt conveyor, 9 telescopic arm, 10 electromagnetic suction plate, 11 air outlet, 12 drainage outlet, 13 exhaust outlet, 14 paint outlet, 15 circulation channel, 16 mounting plate, 17 motor, 18 flushing water pipe, 19 drying air duct, 20 paint spray pipe, 21 slider, 22 mounting groove, 23 double-headed screw, 24 pneumatic clamp, 25 cylinder, 26 second conductive rail, 27 connecting port, 28 paint outlet channel, 29 drainage channel, 30 loading platform, 31 connecting frame, 32 hydraulic cylinder, 33 bracket, 34 convex strip, 35 blowing pipe, 36 blowing channel, 37 material trough, 38 partition. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Reference Figure 1-8 A steel structure painting device comprises a processing channel 1 fixedly mounted above a bracket 33, a circulation channel 15 is arranged in the middle of the processing channel 1, a cleaning channel 4, a drying channel 3 and a painting channel 2 are arranged on both sides of the circulation channel 15 from the inside to the outside, a belt conveyor 8 is mounted on the bracket 33, the upper half of the belt conveyor 8 passes through the circulation channel 15, a plurality of pairs of telescopic arms 9 are fixedly mounted at intervals on the surface of the belt conveyor 8, the telescopic directions of each pair of telescopic arms 9 are opposite and perpendicular to the conveying direction, an electromagnetic suction plate 10 is detachably mounted on the telescopic end of the telescopic arm 9, the electromagnetic suction plate 10 is used to magnetically absorb the back of the color steel plate, the cleaning channel 4, the drying channel 3 and the painting channel 2 are arranged in parallel, the color steel plate is magnetically absorbed and circulated and retracted, the floor space is small, the color steel plate cleaning-drying-painting-drying process can be automatically completed, the bilateral synchronous cleaning, drying and painting are high in efficiency.

[0038] The cleaning channel 4, the drying channel 3, the paint spraying channel 2 and the circulation channel 15 are separated by a partition 38. The side wall of the partition 38 is provided with a connecting port 27 for the telescopic end of the telescopic arm 9 to pass through. The cleaning channel 4, the drying channel 3, the paint spraying channel 2, the circulation channel 15 and both ends of the connecting port 27 are open. An air wall partition mechanism is installed in the connecting port 27. The air cavity partition mechanism includes a blowing duct 36 arranged at the top of the connecting port 27. A blowing pipe 35 is provided in the top of the partition 38. A plurality of blowing holes connected to the blowing duct 36 are provided at the bottom of the blowing pipe 35. An air outlet 11 is provided below the corresponding connecting port 27 on the partition 38. During the cleaning, drying and painting processes, the blowing pipe 35 blows air into the blowing duct 36 through the plurality of blowing holes. The gas in the blowing duct 36 is evenly blown downward into the air outlet 11 to form an air wall to avoid mutual influence between water vapor, paint water and hot air.

[0039] A flushing water pipe 18, a drying air duct 19 and a paint spraying pipe 20 are fixedly installed on the top of the cleaning channel 4, the drying channel 3 and the paint spraying channel 2, respectively. A plurality of water spray heads are arranged at the bottom of the flushing water pipe 18, a plurality of air outlet holes are arranged at the bottom of the drying air duct 19, and a plurality of paint spraying heads are arranged at the bottom of the paint spraying pipe 20. A mounting plate 16 is fixedly installed on the top of the feeding end of the processing channel 1, and a mounting groove 22 is arranged at the bottom of the mounting plate 16. A pair of sliders 21 are slidably installed in the mounting groove 22, and a lifting pneumatic clamp 24 is installed at the bottom of the slider 21. The movable clamp 24 is used to clamp the telescopic end of the corresponding telescopic arm 9. A double-headed screw 23 is rotatably connected in the mounting groove 22. A pair of sliders 21 are respectively threadedly connected to the two ends of the double-headed screw 23. A vertical cylinder 25 is staggered and fixedly installed at the bottom of the two sliders 21. The pneumatic clamp 24 is fixedly installed on the telescopic end of the cylinder 25. A motor 17 that can drive the double-headed screw 23 to rotate is installed at the end of the mounting plate 16. The telescopic arm 9 can be actively pulled to extend and retract, and the color steel plate can be pulled to the corresponding cleaning channel 4, drying channel 3 and paint spraying channel 2.

[0040] Furthermore, support rails 7 are fixed on both sides of the belt conveyor 8 in the circulation channel 15. The shape of the support rails 7 is consistent with the conveying path of the belt conveyor 8. The end of the telescopic arm 9 is slidably connected to the support rails 7. The support rail 7 is a first conductive rail. The electromagnetic suction plate 10 at the telescopic end of the telescopic arm 9 is slidably electrically connected to the first conductive rail. A second conductive rail 26 is connected in series to the right side of the bottom of the support rail 7. A unloading belt conveyor 6 is installed below the second conductive rail 26. The second conductive rail 26 is externally connected to a controller. The telescopic arm 9 is supported and guided by the support rails 7. The first conductive rail is in a state of being energized all the time, and thus maintains a magnetic state during the loading, cleaning, drying and painting processes. When circulating to the top of the corresponding unloading belt conveyor 6, the circuit of the second conductive rail 26 is disconnected by the controller, and the circuit of the corresponding electromagnetic suction plate 10 is disconnected, and the painted and dried color steel plate is released and transported out through the unloading belt conveyor 6, thereby realizing an automatic unloading process.

[0041] Furthermore, a hydraulic cylinder 32 is fixedly installed on the left side of the bracket 33, and a connecting frame 31 is fixedly installed on the telescopic end of the hydraulic cylinder 32. A loading platform 30 is fixedly installed at both ends of the connecting frame 31. A material trough 37 for pushing the color steel plate is provided on the loading platform 30. A plurality of convex strips 34 adapted to the concave and convex sections of the color steel plate are fixed in the material trough 37. A plurality of grooves adapted to the concave and convex sections of the color steel plate are provided on the surface of the electromagnetic suction plate 10. Conveyors 5 for feeding the color steel plate into the material trough 37 are installed on the front and rear sides of the bracket 33. The color steel plate is intermittently transported by a pair of conveyors 5. The color steel plate is pushed into the material trough 37 of the loading platform 30. A plurality of convex strips 34 are stuck in the recesses of the color steel plate. The hydraulic cylinder 32 is started to push the two color steel plates upward to the corresponding electromagnetic suction plate 10. The convex sections of the color steel plates are stuck in the grooves of the electromagnetic suction plate 10. After magnetic attraction, they are transported through the belt conveyor 8 to complete the automatic feeding process.

[0042] In addition, a drain port 12, an exhaust port 13 and a paint discharge port 14 are respectively provided at the bottom of the cleaning channel 4. A drain channel 29 connected to the drain port 12 is installed at the bottom of the cleaning channel 4. A paint discharge channel 28 connected to the paint discharge port 14 is installed at the bottom of the paint spraying channel 2. The air outlet ducts 11 on both sides of the cleaning channel 4 are connected to the drain channel 29, and the air outlet duct 11 on one side of the paint spraying channel 2 is connected to the paint discharge channel 28. Excess paint water is discharged through the paint discharge channel 28, the sewage after flushing is discharged through the drain channel 29, and the hot air is discharged through the exhaust port 13.

[0043] The color steel plates are intermittently transported by a pair of conveyors 5. The color steel plates are pushed into the material trough 37 of the loading platform 30. A plurality of convex strips 34 are stuck in the recesses of the color steel plates. The hydraulic cylinder 32 is started to push the two color steel plates upward to the corresponding electromagnetic suction plates 10. The raised sections of the color steel plates are stuck in the grooves of the electromagnetic suction plates 10. After magnetic attraction, they are transported by the belt conveyor 8 to complete the automatic loading process.

[0044] When it is transported to the feeding port of the processing channel 1, a pair of cylinders 25 are started to drive the pneumatic clamps 24 to move down and clamp the telescopic ends of a pair of telescopic arms 9, and the motor 17 is started to drive the double-headed screw 23 to rotate, and the telescopic end is driven to move by the movement of a pair of sliders 21, so as to pull the magnetically attracted color steel plate to the corresponding cleaning channel 4 position, pass through the cleaning channel 4, and complete the surface flushing process through the flushing water pipe 18, and circulate to the feeding port again, and pull the color steel plate to the corresponding drying channel 3 position through the pneumatic clamps 24, and complete the drying process after cleaning through the drying air duct 19, and continue to circulate to the feeding port, and pull the color steel plate to the corresponding paint channel 2 position through the pneumatic clamps 24, and complete the painting process through the paint spraying pipe 20 and multiple paint spraying heads, and finally circulate through the drying channel 3 to complete the final drying process, and cooperate with the circulation automation to complete the cleaning-drying-painting-drying process.

[0045] During the circulation and conveying process, the telescopic arm 9 is supported and guided by the supporting guide rail 7, and the first conductive rail is always energized, thereby maintaining a magnetic attraction state during the loading, cleaning, drying and painting processes. When it circulates to the top of the corresponding unloading belt conveyor 6, the circuit of the second conductive rail 26 is disconnected by the controller, and the circuit of the corresponding electromagnetic suction plate 10 is disconnected, so that the painted and dried color steel plate is released and transported out through the unloading belt conveyor 6, realizing the automatic unloading process.

[0046] The setting of the connecting port 27 allows the telescopic end of the telescopic arm 9 to pass normally. During the cleaning, drying and painting processes, the blowing pipe 35 blows air into the blowing duct 36 through multiple blowing holes. The gas in the blowing duct 36 is evenly blown downward into the air outlet duct 11 to form an air wall to avoid mutual influence between water vapor, paint water and hot air.

[0047] 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 steel structure painting device, comprising a processing channel (1) fixedly mounted above a bracket (33), characterized in that: A circulation channel (15) is provided in the middle of the processing channel (1). The processing channel (1) is located on both sides of the circulation channel (15) and is provided with a cleaning channel (4), a drying channel (3) and a painting channel (2) in sequence from the inside to the outside. A belt conveyor (8) is installed on the bracket (33). The upper half of the belt conveyor (8) passes through the circulation channel (15). A plurality of pairs of telescopic arms (9) are fixedly installed at intervals on the surface of the belt conveyor (8). The telescopic directions of each pair of telescopic arms (9) are opposite and perpendicular to the conveying direction. The telescopic ends of the telescopic arms (9) are detachably provided with an electromagnetic suction plate (10). The electromagnetic suction plate (10) is used to magnetically attract the back of the color steel plate. The cleaning channel (4), the drying channel (3), the painting channel (2) and the circulation channel (15) The two processing channels (1) and (2) are separated by a partition (38), the side wall of the partition (38) is provided with a connecting port (27) for the telescopic end of the telescopic arm (9) to pass through, and an air wall partition mechanism is installed in the connecting port (27). The tops of the cleaning channel (4), the drying channel (3) and the painting channel (2) are respectively fixedly installed with a flushing water pipe (18), a drying air duct (19) and a paint spraying pipe (20). The top of the feeding end of the processing channel (1) is fixedly installed with a mounting plate (16), the bottom of the mounting plate (16) is provided with a mounting groove (22), a pair of sliders (21) are slidably installed in the mounting groove (22), and the bottom of the slider (21) is installed with a lifting pneumatic clamp (24), and the pneumatic clamp (24) is used to clamp the telescopic end of the corresponding telescopic arm (9).

2. A steel structure painting device according to claim 1, characterized in that: Support rails (7) are fixed on both sides of the belt conveyor (8) in the circulation channel (15); the shape of the support rails (7) is consistent with the conveying path of the belt conveyor (8); and the end of the telescopic arm (9) is slidably connected to the support rails (7).

3. A steel structure painting device according to claim 2, characterized in that: The support rail (7) is a first conductive rail, the electromagnetic suction plate (10) at the telescopic end of the telescopic arm (9) is slidably electrically connected to the first conductive rail, a second conductive rail (26) is serially connected to the right side of the bottom of the support rail (7), a material unloading belt conveyor (6) is installed below the second conductive rail (26), and the second conductive rail (26) is externally connected to a controller.

4. A steel structure painting device according to claim 1, characterized in that: The bottom of the flushing water pipe (18) is provided with a plurality of water spray heads, the bottom of the drying air pipe (19) is provided with a plurality of air outlet holes, and the bottom of the paint spraying pipe (20) is provided with a plurality of paint spray heads.

5. A steel structure painting device according to claim 1, characterized in that: Both ends of the cleaning channel (4), the drying channel (3), the paint spraying channel (2), the circulation channel (15) and the connecting port (27) are open.

6. A steel structure painting device according to claim 1, characterized in that: The air cavity partition mechanism comprises an air blowing duct (36) arranged at the top of the connecting port (27); an air blowing pipe (35) is arranged at the top of the partition (38); a plurality of air blowing holes connected to the air blowing duct (36) are arranged at the bottom of the air blowing pipe (35); and an air outlet duct (11) is arranged below the corresponding connecting port (27) on the partition (38).

7. A steel structure painting device as claimed in claim 6, characterized in that: The bottoms of the cleaning channel (4), the drying channel (3) and the paint spraying channel (2) are respectively provided with a drainage port (12), an exhaust port (13) and a paint discharge port (14); the bottom of the cleaning channel (4) is provided with a drainage channel (29) connected to the drainage port (12); the bottom of the paint spraying channel (2) is provided with a paint discharge channel (28) connected to the paint discharge port (14); the air outlets (11) on both sides of the cleaning channel (4) are connected to the drainage channel (29); the air outlets (11) on one side of the paint spraying channel (2) are connected to the paint discharge channel (28).

8. A steel structure painting device according to claim 1, characterized in that: A double-headed screw (23) is rotatably connected in the installation groove (22), a pair of sliders (21) are respectively threadedly connected to the two ends of the double-headed screw (23), a vertical cylinder (25) is staggered and fixedly installed at the bottom of the two sliders (21), the pneumatic clamp (24) is fixedly installed at the telescopic end of the cylinder (25), and a motor (17) that can drive the double-headed screw (23) to rotate is installed at the end of the installation plate (16).

9. A steel structure painting device according to claim 1, characterized in that: A hydraulic cylinder (32) is fixedly installed on the left side of the bracket (33), a connecting frame (31) is fixedly installed on the telescopic end of the hydraulic cylinder (32), a loading platform (30) is fixedly installed on both ends of the connecting frame (31), the loading platform (30) is provided with a material trough (37) for pushing the color steel plate, a plurality of convex strips (34) adapted to the concave and convex sections of the color steel plate are fixed in the material trough (37), a plurality of grooves adapted to the concave and convex sections of the color steel plate are provided on the surface of the electromagnetic suction plate (10), and a conveyor (5) for feeding the color steel plate into the material trough (37) is installed on both the front and rear sides of the bracket (33).

10. A painting method based on a steel structure painting device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, the color steel plates are intermittently transported by a pair of conveyors (5), the color steel plates are pushed onto a loading platform (30), the hydraulic cylinder (32) is started, and the two color steel plates are pushed upward to the corresponding electromagnetic suction plates (10), and after magnetic suction, they are transported by a belt conveyor (8); S2, when transported to the inlet of the processing channel (1), a pair of air cylinders (25) are started to drive the pneumatic clamps (24) to move downward to clamp the telescopic ends of a pair of telescopic arms (9), and the motor (17) is started to drive the double-headed screw (23) to rotate, and the telescopic ends are driven to move by the movement of a pair of sliders (21), thereby pulling the magnetically attracted colored steel plate to the corresponding cleaning channel (4) position; S3, passing through the cleaning channel (4), completing the surface flushing process through the flushing water pipe (18), circulating to the feed inlet again, pulling the color steel plate to the corresponding drying channel (3) position through the pneumatic clamp (24), completing the drying process after cleaning through the drying air duct (19), continuing to circulate to the feed inlet, pulling the color steel plate to the corresponding paint spraying channel (2) position through the pneumatic clamp (24), completing the paint spraying process through the paint spraying pipe (20) and multiple paint spraying heads, and finally circulating through the drying channel (3) to complete the final drying process; S4, when circulating to the top of the corresponding unloading belt conveyor (6), the circuit of the second conductive rail (26) is disconnected by the controller, the circuit of the corresponding electromagnetic suction plate (10) is disconnected, the painted and dried color steel plate is released, and it is transported out through the unloading belt conveyor (6).

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