Metal plate spraying device

Abstract

The invention belongs to the technical field of plate spraying, particularly relates to a metal plate spraying device, and aims to solve the problem that in the prior art, horizontal spraying easily causes paint gathering and further causes uneven thickness, the following scheme is provided: the metal plate spraying device comprises a dust collection mechanism and a supporting seat, and the supporting seat comprises two C-shaped supporting legs with openings facing the front side; a connecting beam is fixed between the top ends of the two C-shaped supporting legs, a spraying sliding rail is fixed to the upper surface of the connecting beam, a spraying mechanism is arranged above the spraying sliding rail, an annular rail base is fixed to the upper surface of the supporting base, and the spraying direction of the spraying mechanism always faces the back face of the device. An arc-shaped clamping ring with the central angle exceeding the degree is connected to the annular rail base in a sliding and sleeving mode. Due to the fact that each feeding station can be arranged to be flat during feeding, hoisting feeding and roller bed feeding are facilitated, and after a to-be-sprayed metal plate body is fixed by a suction cup in the tightening mechanism, the to-be-sprayed metal plate body can be overturned to be in a vertical state and then rotated to the spraying station to be sprayed.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet spraying, and particularly relates to a spraying device for metal sheets. Background Art

[0002] With the continuous development of industrial production, metal sheet spraying is widely used in the manufacturing industry. To improve production efficiency, the traditional manual spraying method can no longer meet the needs of large-scale and high-precision production. Therefore, automated and precision spraying equipment has become an indispensable part of industrial production. The metal sheet spraying equipment can achieve high-efficiency and large-batch spraying operations through an automated control system.

[0003] After retrieval, when the existing sheet spraying machine sprays the sheet material, in order to make the loading and unloading of the metal sheet more convenient, the sheet is often sprayed in a lying flat manner. However, this spraying method has higher requirements for the evenness of the gun's material output. Once the material output is uneven, it is extremely easy to cause uneven coating thickness on the sheet surface, and even quality defects such as bubbling during the subsequent drying process. Therefore, a new spraying method is proposed to solve the many drawbacks brought by spraying the sheet in a lying flat manner. Summary of the Invention

[0004] Aiming at the technical problem that the lying flat spraying in the prior art easily leads to the accumulation of the coating and then causes uneven thickness, the present invention adopts the following technical solutions: A spraying device for metal sheets includes a dust suction mechanism and a support base. The support base includes two C-shaped support legs with openings facing the front. A connecting beam is fixed between the tops of the two C-shaped support legs. The upper surface of the connecting beam is fixed with a spraying slide rail, and a spraying mechanism is arranged above the spraying slide rail. The upper surface of the support base is fixed with an annular rail seat, and the spraying direction of the spraying mechanism always faces the back of the device; an arc-shaped clamping ring with a central angle exceeding 180 degrees is slidably sleeved on the annular rail seat. At both ends of the upper surface of the arc-shaped clamping ring, shaft rod rotating frames are respectively fixed in a centrally symmetric distribution. The tops of the shaft rod rotating frames are rotatably connected with fixed worm gear disks. The central plane of the fixed worm gear disk passes through the vertical center line of the annular rail seat, and an installation notch is opened on the circumferential surface of the fixed worm gear disk. A supporting rail with an opening away from the shaft rod rotating frame is fixed in the installation notch; at both ends of the outer arc side of the arc-shaped clamping ring, servo motors are respectively fixed in a centrally symmetric distribution. The end of the output shaft of the servo motor is fixed with a worm gear sleeve one that extends horizontally towards the middle and meshes with the fixed worm gear disk on the corresponding side; a tensioning mechanism is slidably connected to each supporting rail. The tensioning mechanism includes convex platform sliders slidably connected to the chutes at both ends of the supporting rail. On one side of the two convex platform sliders away from the bottom of the chute, arched fixing rods are respectively fixed, and suction cups are arranged at both ends of the arched fixing rods.

[0005] A further arrangement of the present invention is that the dust suction mechanism includes a horizontal cross beam frame fixed above the rear side of the device, and the cross beam frame is parallel to the spraying slide rail. Vertically and parallel guiding slide rods are respectively fixed near both ends of the lower surface of the cross beam frame, and the same dust suction frame with an overall downward-opening U-shaped structure is slidably connected between the bottom ends of the two guiding slide rods. A strip-shaped air hole is formed on the front surface of the dust suction frame, and an exhaust pipe is reserved at the top end of the dust suction frame for connecting to a suction device.

[0006] A further arrangement of the present invention is that a pulley frame is provided in the middle of the top end of the cross beam frame, and a grooved fixed pulley is provided in the middle of the pulley frame. A lifting rope is slidably connected in the pulley groove of the grooved fixed pulley. One end of the lifting rope is fixed to the top end of the dust suction frame. When in use, if the area of the metal plate body is larger than the inner edge size of the dust suction frame, it is only necessary to control the lifting rope to lift the whole dust suction frame.

[0007] A further arrangement of the present invention is that the spraying mechanism includes an electric slider slidably connected to the spraying slide rail, and a distance adjusting plate is fixed on the upper surface of the electric slider for adjusting the distance between the surface of the metal plate body and the muzzle of the spray gun during spraying. A vertical slide rail and a high-speed air blower are fixed on the upper surface of the distance adjusting plate. A reciprocating slider is slidably connected inside the vertical slide rail, and a spray gun extending backward is fixed on the side of the reciprocating slider away from the bottom of the groove. The air inlet end of the spray gun is connected to the air outlet of the high-speed air blower through a hose, and the liquid inlet of the spray gun is communicated with a suction pipe, and the other end of the suction pipe is provided with a raw material barrel; thus, it can uniformly spray the vertically placed metal plate body from top to bottom during use.

[0008] A further arrangement of the present invention is that a double-limiting fixing strip is fixed in the middle of the circumferential outer wall of the annular rail seat at the front. Two blocking blocks one and two with different distances from the center of the circle are fixed on the upper surface of the double-limiting fixing strip. The blocking blocks one and two are both provided with a contact surface passing through the center of the circle, and pressure sensors are embedded on both contact surfaces; respectively fixed on the lower surfaces of the two motor fixing brackets are symmetrically arranged movable blocking blocks one and two, and the movable blocking blocks one and two are both reserved with a contact surface passing through the center of the circle; through the arranged blocking blocks one and two, in cooperation with the pressure sensors embedded in the middle of their contact surfaces, when switching between the two working positions, it is only necessary to reciprocally push the arc-shaped clamping ring to rotate. When reaching the spraying working position, it will automatically touch the pressure sensor and then automatically stop. The mechanism for driving the arc-shaped clamping ring to reciprocally rotate can be provided with a servo motor and a rubber wheel, and the circumferential outer wall of the rubber wheel tightly contacts the circumferential outer wall of the arc-shaped clamping ring.

[0009] A further arrangement of the present invention is that ball bearings are embedded in the inner wall of the groove bottom of the arc-shaped clamping ring, and an annular groove adapted to the position of the ball bearings is provided on the upper surface of the annular rail seat, which can reduce the wear when the arc-shaped clamping ring rotates.

[0010] Further arrangements of the present invention are that at one end of the groove bottom of the supporting rail far from the fixed worm wheel disc, embedding grooves are respectively formed, and a spirit level is embedded in each embedding groove, which can ensure that the metal plate body can be quickly rotated to an approximately vertical state before spraying, thereby improving the feeding efficiency during spraying.

[0011] Further arrangements of the present invention are that an anti - detachment bearing is embedded in the groove bottom of the supporting rail near the middle, and a transmission rod perpendicular to the groove bottom of the supporting rail is rotatably connected in the middle of the anti - detachment bearing. A rubbing gear and a first worm wheel are respectively fixed at both ends of the transmission rod. On the opposite sides of the two arched fixing rods, rack rods symmetrically distributed about the rubbing gear are respectively fixed. The rubbing gear meshes with the two rack rods at the same time; near the middle of the back surface of the supporting rail, a shaft rod seat is arranged, and a first worm meshing with the first worm wheel is rotatably connected in the middle of the shaft rod seat.

[0012] Further arrangements of the present invention are that the suction cup includes a fixed sleeve with an overall annular tube structure. At one end of the fixed sleeve far from the supporting rail, an annular convex rib is reserved. A reset rubber sleeve is hermetically sleeved at the annular convex rib. At one end of the inner circumferential wall of the fixed sleeve far from the annular convex rib, a spring support block is fixed. A reset tension spring is fixed on the surface of the spring support block, and at one end of the reset tension spring far from the reset rubber sleeve, a sealing cover is fixed; near the flared opening of the inner wall of the reset rubber sleeve, a bearing pressure plate is embedded, and reset springs are fixed between the bearing pressure plate and the annular convex rib at equidistant intervals; when in use, when it is necessary to adsorb the metal plate body, it only needs to be pressed downwards, and when it is necessary to remove the adsorption, it only needs to pull the sealing cover along the extending direction of the reset tension spring.

[0013] Further arrangements of the present invention are that a sealing ring is embedded near the edge on one side of the sealing cover close to the pipe orifice, and a pull ring is reserved in the middle of the sealing cover, which improves the sealing effect and is convenient for deflating to release the adsorption.

[0014] The beneficial effects of the present invention are as follows: 1. By providing an arc - shaped clamping ring slidably connected to the annular rail seat and cooperating with two symmetrically arranged feeding stations fixed above it, since each feeding station can be set in a lying - flat manner during feeding, it is beneficial for hoisting feeding and roller - path feeding. After the metal plate body to be sprayed is fixed by the suction cup in the tensioning mechanism, it can be flipped to a vertical state and then rotated to the spraying station for spraying.

[0015] 2. By providing the dust - suction frame, during spraying, the dust - suction frame can be clamped at the rear side near the two sides and the top edge of the vertical metal plate body, and at this time, the excess oil mist sprayed to the edge can be sucked, thereby reducing the pollution of the oil mist to the surrounding environment.

[0016] 3. Through the provided tensioning mechanism, after adsorbing the thin plate part during loading, it can be pulled towards both ends, and then the metal plate body to be sprayed can be flattened. The metal plate body is flattened with the fewest fixed points to ensure that the distance from each spraying point to the spray gun is the same. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of a metal plate spraying device proposed by the present invention during spraying; Figure 2 It is a schematic diagram of the bottom-up three-dimensional structure of a metal plate spraying device proposed by the present invention after lifting the dust suction frame; Figure 3 It is a top view of a metal plate spraying device proposed by the present invention after removing the dust suction mechanism; Figure 4 A metal plate spraying device proposed by the present invention Figure 3 The sectional structure schematic diagram along the A-A line; Figure 5 It is an exploded view of the tensioning mechanism in a metal plate spraying device proposed by the present invention; Figure 6 It is a sectional view of the suction cup in a metal plate spraying device proposed by the present invention; Figure 7 It is an assembly drawing of the arc-shaped clamping ring in a metal plate spraying device proposed by the present invention.

[0018] In the figure: 1. Support base; 2. Ring rail seat; 3. Dust suction frame; 4. Suspension rope; 5. Cross beam frame; 6. Pulley frame; 7. Guide slide rod; 8. Strip-shaped air holes; 9. Spray gun; 10. Vertical slide rail; 11. High-speed blower; 12. Arc-shaped clamping ring; 13. Tensioning mechanism; 131. Transmission rod; 132. Boss slider; 133. Arch-shaped fixed rod; 134. Rack rod; 135. Rubbing gear; 136. Shaft rod seat; 137. Worm one; 138. Suction cup; 1381. Fixed sleeve; 1382. Reset rubber sleeve; 1383. Bearing pressure plate; 1384. Reset spring; 1385. Spring support block; 1386. Reset tension spring; 1387. Sealing cover; 14. Support rail; 15. Fixed worm disk; 151. Shaft rod rotating frame; 16. Motor fixed support plate; 161. Movable stop one; 162. Movable stop two; 17. Double limit fixing strip; 171. Blocking block one; 172. Blocking block two; 173. Pressure sensor; 18. Raw material barrel; 19. Distance adjusting plate; 20. Spraying slide rail; 2001. Electric slider; 21. Metal plate body; 22. Servo motor. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] In this embodiment, referring to Figure 1-7 , a metal sheet spraying device includes a dust suction mechanism and a support base 1. The support base 1 includes two C-shaped support legs with openings facing the front. A connecting beam is fixed between the tops of the two C-shaped support legs, and a spraying slide rail 20 is fixed on the upper surface of the connecting beam. A spraying mechanism is arranged above the spraying slide rail 20. A circular rail seat 2 is fixed on the upper surface of the support base 1, and the spraying direction of the spraying mechanism always faces the back of the device; an arc-shaped clamping ring 12 with a central angle exceeding 180 degrees is slidably sleeved on the circular rail seat 2. Shaft rod rotating frames 151 distributed in central symmetry are respectively fixed on the upper surface of the arc-shaped clamping ring 12 near both ends. Fixed worm gear discs 15 are rotatably connected to the tops of the shaft rod rotating frames 151. The central plane of the fixed worm gear disc 15 passes through the vertical center line of the circular rail seat 2, and an installation notch is opened on the circumferential surface of the fixed worm gear disc 15. A support rail 14 with an opening away from the shaft rod rotating frame 151 is fixed in the installation notch; Servo motors 22 distributed in central symmetry are respectively fixed on the outer arc side of the arc-shaped clamping ring 12 near both ends, and a worm gear sleeve one horizontally extending towards the middle and meshing with the fixed worm gear disc 15 on the corresponding side is fixed to the end of the output shaft of the servo motor 22; A tensioning mechanism 13 is slidably connected to each support rail 14, and the tensioning mechanism 13 includes convex platform sliders 132 slidably connected to the chutes near both ends of the support rail 14. Arch-shaped fixing rods 133 are fixed to the sides of the two convex platform sliders 132 away from the bottom of the chute, and suction cups 138 are arranged at both ends of the arch-shaped fixing rods 133. Specifically, by providing the arc-shaped clamping ring 12 slidably connected to the circular rail seat 2 and cooperating with the two upper feeding stations symmetrically arranged above it, since each upper feeding station can be set in a lying position during upper feeding, it is beneficial for hoisting upper feeding and roller table upper feeding. After the metal plate body 21 to be sprayed is fixed by the suction cups 138 in the tensioning mechanism 13, it can be flipped to a vertical state and then rotated to the spraying station for spraying.

[0021] In the present invention, the dust suction mechanism includes a horizontal crossbeam frame 5 fixed above the rear side of the device, and the crossbeam frame 5 is parallel to the spraying slide rail 20. Vertically and parallel guiding slide rods 7 are respectively fixed near both ends of the lower surface of the crossbeam frame 5. A dust suction frame 3 with an overall downward-opening U-shaped structure is slidably connected between the bottom ends of the two guiding slide rods 7. A strip-shaped air hole 8 is opened on the front surface of the dust suction frame 3, and an exhaust pipe is reserved at the top end of the dust suction frame 3 for connecting to a suction device. By providing the dust suction frame 3, during spraying, the dust suction frame 3 can be clamped at the rear side near the two sides and the top edge of the vertical metal plate body 21. At this time, the excess oil mist sprayed onto the edge can be sucked, thereby reducing the pollution of the oil mist to the surrounding environment.

[0022] Referring to Figure 1 , a pulley frame 6 is provided in the middle of the top end of the crossbeam frame 5, and a grooved fixed pulley is provided in the middle of the pulley frame 6. A suspension rope 4 is slidably connected in the groove of the grooved fixed pulley. One end of the suspension rope 4 is fixed to the top end of the dust suction frame 3. When in use, if the area of the metal plate body 21 is larger than the inner edge size of the dust suction frame 3, it is only necessary to control the suspension rope 4 to lift the dust suction frame 3 as a whole.

[0023] Referring to Figure 1-Figure 4 , the spraying mechanism includes an electric slider 2001 slidably connected to the spraying slide rail 20. A distance adjusting plate 19 is fixed on the upper surface of the electric slider 2001 for adjusting the distance between the surface of the metal plate body 21 and the muzzle of the spray gun 9 during spraying. A vertical slide rail 10 and a high-speed air blower 11 are fixed on the upper surface of the distance adjusting plate 19. A reciprocating slider is slidably connected inside the vertical slide rail 10. The reciprocating slider is fixed with a spray gun 9 extending backward on the side away from the bottom of the groove. The air inlet end of the spray gun 9 is connected to the air outlet of the high-speed air blower 11 through a hose, and the liquid inlet of the spray gun 9 is communicated with a suction pipe. The other end of the suction pipe is provided with a raw material barrel 18; thus, the vertical metal plate body 21 can be evenly sprayed from top to bottom during use.

[0024] Referring to Figure 4 and Figure 7, on the circumferential outer wall of the annular rail seat 2, a double-limiting fixing strip 17 is fixedly installed in the middle of the front. On the upper surface of the double-limiting fixing strip 17, two blocking blocks 171 and 172 with different distances from the center of the circle are fixedly installed. The blocking block 171 and the blocking block 172 are both provided with a contact surface passing through the center of the circle. Pressure sensors 173 are embedded in both contact surfaces; on the lower surfaces of the two motor fixing brackets 16, symmetrically arranged movable blocking blocks 161 and 162 are fixedly installed respectively. The movable blocking blocks 161 and 162 are both reserved with a contact surface passing through the center of the circle; by setting the blocking block 171 and the blocking block 172, and cooperating with the pressure sensors 173 embedded in the middle of their contact surfaces, when switching between two workstations, it is only necessary to reciprocally push the arc-shaped clamping ring 12 to rotate. When reaching the spraying workstation, it will automatically touch the pressure sensor 173 and then automatically stop. The mechanism for driving the arc-shaped clamping ring 12 to rotate reciprocally can be set with a servo motor and a rubber wheel. The circumferential outer wall of the rubber wheel is tightly in contact with the circumferential outer wall of the arc-shaped clamping ring 12.

[0025] In the present invention, balls are embedded in the inner wall of the groove bottom of the arc-shaped clamping ring 12, and an annular groove adapted to the positions of the balls is provided on the upper surface of the annular rail seat 2, which can reduce the wear when the arc-shaped clamping ring 12 rotates.

[0026] In the present invention, embedding grooves are respectively opened at one ends of the groove bottoms of the supporting rails 14 far away from the fixed worm wheel disc 15, and spirit levels are embedded in the embedding grooves, which can ensure that the metal plate body 21 can be quickly rotated to an approximately vertical state before spraying, and improve the feeding efficiency during spraying.

[0027] Refer to Figure 5-Figure 6 , an anti-drop bearing is embedded in the groove bottom of the supporting rail 14 near the middle. A transmission rod 131 perpendicular to the groove bottom of the supporting rail 14 is rotatably connected in the middle of the anti-drop bearing. A rubbing gear 135 and a worm wheel 137 are respectively fixedly installed at both ends of the transmission rod 131. Rack bars 134 symmetrically distributed about the rubbing gear 135 are respectively fixedly installed on the opposite sides of the two arched fixing rods 133. The rubbing gear 135 is meshed with the two rack bars 134 at the same time; a shaft rod seat 136 is arranged near the middle of the back surface of the supporting rail 14, and a worm 1 meshed with the worm wheel 137 is rotatably connected in the middle of the shaft rod seat 136. By setting the tensioning mechanism 13, when loading materials, after adsorbing the thin plate member, it is pulled towards both ends, and then the metal plate body 21 to be sprayed can be flattened, and the metal plate body 21 is flattened with the smallest fixed points to ensure that the distances from each spraying point to the position of the spray gun 9 are the same.

[0028] Refer to Figure 6, the suction cup 138 includes a fixed sleeve 1381 that is integrally in a ring-shaped tube structure, and a ring-shaped convex rib is reserved at one end of the fixed sleeve 1381 away from the support rail 14. A reset rubber sleeve 1382 is hermetically sleeved at the ring-shaped convex rib. One end of the inner circumferential wall of the fixed sleeve 1381 away from the ring-shaped convex rib is fixed with a spring support block 1385. A reset tension spring 1386 is fixed on the surface of the spring support block 1385, and one end of the reset tension spring 1386 away from the reset rubber sleeve 1382 is fixed with a sealing cover 1387; a bearing pressure plate 1383 is embedded in the inner wall of the reset rubber sleeve 1382 near the flared opening, and a plurality of reset springs 1384 are fixed between the bearing pressure plate 1383 and the ring-shaped convex rib at equal distances; when in use, when it is necessary to adsorb the metal plate body 21, just press it downwards, and when it is necessary to remove the adsorption, just pull the sealing cover 1387 along the extension direction of the reset tension spring 1386.

[0029] Referring to Figure 6 , a sealing ring is embedded near the edge on one side of the sealing cover 1387 close to the pipe orifice, and a pull ring is reserved in the middle of the sealing cover 1387 to improve the sealing effect and facilitate deflation to release the adsorption.

[0030] Working principle: First, control the support rail 14 rotated to the front to rotate to a horizontal position with the opening facing upwards, and then hoist the metal plate body 21 to be sprayed or transport it to the four suction cups 138 of the tensioning mechanism 13 through a roller path. Then, finely adjust and align the metal plate body 21, and then press down at the four corners to ensure that the metal plate body 21 is adsorbed; then, reversely control the output shaft of the servo motor 22 to rotate, and then erect the adsorbed metal plate body 21. Then, rotate the arc-shaped clamping ring 12 to rotate the erected metal plate body 21 to the rear spraying position. Then, control the dust suction frame 3 to descend, and at this time, spraying can start; during spraying, the dust suction frame 3 is stuck at the rear of the vertical metal plate body 21 near the two sides and the top edge, and at this time, the excess oil mist about to be sprayed onto the edge is sucked, thereby reducing the pollution of the oil mist to the surrounding environment.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A metal sheet spraying device, comprising a dust suction mechanism and a support base (1). The support base (1) includes two C-shaped support legs with openings facing the front. A connecting beam is fixed between the tops of the two C-shaped support legs, and a spraying slide rail (20) is fixed on the upper surface of the connecting beam. A spraying mechanism is arranged above the spraying slide rail (20), and it is characterized in that, The upper surface of the support base (1) is fixedly provided with an annular rail base (2), and the spraying direction of the spraying mechanism always faces the back of the device; an arc-shaped clamping ring (12) with a central angle exceeding 180 degrees is slidably sleeved on the annular rail base (2). The upper surface of the arc-shaped clamping ring (12) is respectively fixedly provided with shaft rod rotating frames (151) distributed in central symmetry near both ends. The top ends of the shaft rod rotating frames (151) are all rotatably connected with fixed worm gear discs (15). The central plane of the fixed worm gear disc (15) passes through the vertical center line of the annular rail base (2), and an installation notch is formed on the circumferential surface of the fixed worm gear disc (15). A supporting rail (14) with an opening away from the shaft rod rotating frame (151) is fixed in the installation notch; on the outer arc side of the arc-shaped clamping ring (12) near both ends, servo motors (22) distributed in central symmetry with each other are respectively fixedly provided, and the end of the output shaft of the servo motor (22) is fixedly provided with a worm gear sleeve one that horizontally extends towards the middle and meshes with the fixed worm gear disc (15) on the corresponding side; a tensioning mechanism (13) is slidably connected to each of the supporting rails (14). The tensioning mechanism (13) includes boss sliders (132) slidably connected in the chutes near both ends of the supporting rail (14). On the side of the two boss sliders (132) away from the bottom of the chute, arched fixing rods (133) are respectively fixedly provided, and suction cups (138) are arranged at both ends of the arched fixing rods (133).

2. The spraying device for metal sheet according to claim 1, characterized in that, The dust suction mechanism includes a horizontal cross beam frame (5) fixed above the rear side of the device, and the cross beam frame (5) is parallel to the spraying slide rail (20). Vertically and parallel guide slide rods (7) are respectively fixedly provided near both ends of the lower surface of the cross beam frame (5). The same dust suction frame (3) with an overall U-shaped structure and an opening downward is slidably connected between the bottom ends of the two guide slide rods (7). A strip-shaped air hole (8) is formed on the front surface of the dust suction frame (3), and an exhaust pipe is reserved at the top end of the dust suction frame (3).

3. The metal sheet spraying device according to claim 2, characterized in that, A pulley frame (6) is arranged in the middle of the top end of the cross beam frame (5), and a grooved fixed pulley is arranged in the middle of the pulley frame (6). A lifting rope (4) is slidably connected in the groove of the grooved fixed pulley, and one end of the lifting rope (4) is fixed to the top end of the dust suction frame (3).

4. A metal sheet spraying device according to claim 1, characterized in that, The spraying mechanism includes an electric slider (2001) slidably connected to the spraying slide rail (20). A distance adjusting plate (19) is fixedly provided on the upper surface of the electric slider (2001). A vertical slide rail (10) and a high-speed air blower (11) are fixedly provided on the upper surface of the distance adjusting plate (19). A reciprocating slider is slidably connected inside the vertical slide rail (10). A spray gun (9) extending towards the rear side is fixedly provided on the side of the reciprocating slider away from the bottom of the chute. The air inlet end of the spray gun (9) is connected to the air outlet of the high-speed air blower (11) through a hose, and the liquid inlet of the spray gun (9) is communicated with a suction pipe. The other end of the suction pipe is provided with a raw material bucket (18).

5. A metal sheet spraying device according to claim 1, characterized in that, On the outer circumferential wall of the annular rail seat (2) at the middle of the front, a double-limit fixing strip (17) is fixedly installed. On the upper surface of the double-limit fixing strip (17), there are two blocking blocks one (171) and blocking blocks two (172) with different distances from the center of the circle. The blocking blocks one (171) and blocking blocks two (172) are both provided with a contact surface passing through the center of the circle, and pressure sensors (173) are embedded in both contact surfaces. On the lower surfaces of the two motor fixing brackets (16), symmetrically arranged movable blocking blocks one (161) and movable blocking blocks two (162) are respectively fixedly installed, and the movable blocking blocks one (161) and movable blocking blocks two (162) are both reserved with a contact surface passing through the center of the circle.

6. The spraying device for metal sheet according to claim 1, characterized in that, On the inner wall of the groove bottom of the arc-shaped clamping ring (12), balls are embedded, and on the upper surface of the annular rail seat (2), an annular groove adapted to the positions of the balls is provided.

7. A metal sheet spraying device according to claim 1, characterized in that, At the end of the groove bottom of the rail support (14) far from the fixed worm wheel disc (15), embedding grooves are respectively opened, and a spirit level is embedded in each embedding groove.

8. The metal sheet spraying device according to claim 1, characterized in that, On the groove bottom of the rail support (14) near the middle, an anti-detachment bearing is embedded. In the middle of the anti-detachment bearing, a transmission rod (131) perpendicular to the groove bottom of the rail support (14) is rotatably connected. At both ends of the transmission rod (131), a rubbing gear (135) and a worm wheel one (137) are respectively fixedly installed. On the opposite sides of the two arched fixing rods (133), rack bars (134) symmetrically distributed with respect to the rubbing gear (135) are respectively fixedly installed. The rubbing gear (135) is simultaneously meshed with the two rack bars (134). Near the middle of the back surface of the rail support (14), a shaft rod seat (136) is provided, and in the middle of the shaft rod seat (136), a worm one meshed with the worm wheel one (137) is rotatably connected.

9. The spraying device for metal sheet according to claim 8, wherein, The suction cup (138) includes a fixed sleeve (1381) integrally in a ring-shaped tube structure. At the end of the fixed sleeve (1381) far from the rail support (14), an annular convex rib is reserved. A reset rubber sleeve (1382) is hermetically sleeved at the annular convex rib. At the end of the inner circumferential wall of the fixed sleeve (1381) far from the annular convex rib, a spring support block (1385) is fixedly installed. On the surface of the spring support block (1385), a reset tension spring (1386) is fixedly installed. At the end of the reset tension spring (1386) far from the reset rubber sleeve (1382), a sealing cover (1387) is fixedly installed. Near the flared opening of the inner wall of the reset rubber sleeve (1382), a bearing pressure plate (1383) is embedded, and between the bearing pressure plate (1383) and the annular convex rib, reset springs (1384) are fixedly installed at equal distances.

10. A metal sheet spraying device according to claim 9, characterized in that, Near the edge on the side of the sealing cover (1387) close to the pipe orifice, a sealing ring is embedded, and a pull ring is reserved in the middle of the sealing cover (1387).

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