Workpiece surface spraying apparatus and spraying method

Abstract

The application discloses a workpiece surface spraying device and a spraying method. The device comprises a spraying device, a rotating frame, a spraying mechanism and a first air knife. The rotating frame is pivotally connected to the frame to switch between a horizontal state and a vertical state. The spraying mechanism is arranged on the frame and sprays a coating on the surface of a workpiece. The first air knife is arranged on the frame and blows and smoothes the coating on the surface of the workpiece. The workpiece surface spraying device has high production efficiency, uniform spraying and high coating utilization rate.

Description

Technical Field

[0001] This invention relates to a spraying device, and more particularly to a workpiece surface spraying device and spraying method. Background Technology

[0002] When manufacturing PCBs with LEDs, a coating is typically applied to their surface to protect the circuitry. Current coating methods include spraying, dip coating, and brush coating. Brush coating requires brushing both sides of the PCB separately, resulting in slow speed, uneven application, and poor performance. Dip coating and spray coating can apply the coating to both sides of the PCB simultaneously, offering high production speed, but the high paint consumption and cost make it unsuitable for production. Spray coating uses a nozzle to spray paint onto the PCB surface; while fast, it still suffers from uneven application and low paint utilization. Summary of the Invention

[0003] The purpose of this invention is to provide a workpiece surface spraying equipment that is automatic, has high production efficiency, uniform spraying, and high paint utilization.

[0004] Another objective of this invention is to provide a spraying method that is highly efficient, produces uniform coating, and has high paint utilization.

[0005] To achieve the above objectives, the present invention provides a workpiece surface spraying device comprising a spraying apparatus, the spraying apparatus comprising a frame, a rotating frame, a spraying mechanism, and a first air knife; the rotating frame is used to carry the workpiece and is pivotally connected to the frame to drive the workpiece to switch between a horizontal state and a vertical state; the spraying mechanism is disposed on the frame and sprays a coating onto the workpiece surface; the first air knife is disposed on the frame and blows and smooths the coating on the workpiece surface.

[0006] Compared with existing technologies, this invention achieves automatic and rapid spraying by setting a rotatable frame on the machine frame, driving the rotatable frame to rotate from a horizontal to a vertical position, and then setting a spraying mechanism to spray both surfaces of the workpiece. Furthermore, by setting a first air knife, the coating on the workpiece is smoothed, achieving a uniform and even coating. Excess paint can be washed away with the airflow, avoiding waste due to excessive coating thickness and effectively improving paint utilization.

[0007] Preferably, the workpiece surface spraying equipment further includes a rotary drive mechanism that drives the rotating frame to rotate between a horizontal and a vertical state. Using the rotary drive mechanism to drive the rotating frame allows for greater automation of the spraying process and improves production efficiency.

[0008] Preferably, the workpiece surface spraying equipment further includes a first transport chain, which is arranged parallel to both sides of the frame so that the workpiece is supported across the two first transport chains; the rotating frame is located below the bearing plane of the first transport chains when in the lateral state; the spraying mechanism and the first air knife are arranged above the bearing plane of the first transport chains.

[0009] Preferably, the workpiece surface spraying equipment further includes a fixture for loading the workpiece, and at least one of the workpiece and the rotating frame is provided with a magnet so that the two are attracted and positioned to each other.

[0010] Preferably, the spraying apparatus further includes a spraying drive mechanism, which is mounted on the frame and has its output end connected to the spraying mechanism to drive the spraying mechanism to move along the surface of the workpiece. By providing the spraying drive mechanism, the spraying mechanism becomes movable, allowing it to spray the workpiece from top to bottom along the vertical direction of the workpiece.

[0011] Preferably, the spraying apparatus further includes an air knife drive mechanism, which is mounted on the frame and its output end is connected to the first air knife to drive the first air knife to move along the surface of the workpiece. This allows the first air knife to smooth the coating on the workpiece from top to bottom along the vertical direction of the workpiece.

[0012] Preferably, the frame is provided with a limiting plate to prevent the rotating frame from over-twisting.

[0013] Preferably, when the rotating frame is in a vertical position, the spraying mechanism and the first air knife are located on the front and rear sides of the rotating frame, respectively. This allows for simultaneous spraying and smoothing of both opposite sides of the workpiece with air, greatly improving production efficiency.

[0014] Preferably, the spraying device further includes a movable limiting member and a limiting driver. The limiting member is located at the end of the rotating frame along the conveying direction of the first transport chain. The limiting member can move close to the bearing plane to block the workpiece from advancing or move away from the bearing plane to release the workpiece. The limiting driver is disposed on the inner side of the frame and its output end is connected to the limiting member to drive the limiting member to move. By setting a movable limiting member, the workpiece can be accurately positioned above the rotating frame during limiting, thereby providing a positioning reference for the workpiece so that the rotating frame can accurately lift the workpiece.

[0015] Preferably, the upper sides of both ends of the rotating frame are provided with positioning plates, and the lower sides are provided with positioning blocks. The positioning plates are fixed to the rotating frame and rotate with the rotating frame to limit the side of the workpiece when it is flipped. The positioning blocks are disposed on the frame and have arc-shaped grooves to limit the ends of the workpiece when it is flipped. This allows the workpiece to be positioned when it is flipped with the rotating frame, ensuring the accuracy of the workpiece position during spraying.

[0016] Preferably, the spraying apparatus further includes a recycling device, which comprises a recycling tray disposed below the rotating frame. This recycling device allows for the recovery and recycling of paint blown off the workpiece, thereby improving paint utilization and saving costs.

[0017] Preferably, the workpiece surface spraying equipment further includes a cleaning device, which is located in front of the spraying device. The cleaning device can clean the sides of the workpiece before spraying, preventing impurities from adhering to the workpiece surface and causing spraying defects, thus effectively improving the spraying effect.

[0018] Specifically, the cleaning device includes a second transport chain and a second air knife. The second transport chain is arranged parallel to both sides of the cleaning device and connects to the front end of the first transport chain. The second air knife is respectively positioned above and below the bearing plane of the second transport chain. By simultaneously blowing air onto the surface and bottom of the workpiece using the second air knife, the workpiece can be cleaned quickly and conveniently.

[0019] Preferably, the workpiece surface spraying equipment further includes a curing device, which is located behind the spraying device. This curing device allows the coating on the workpiece to cure rapidly after spraying, thereby improving spraying quality and production efficiency.

[0020] Specifically, the curing device includes a third transport chain, a heater, and a third air knife. The third transport chain is arranged parallel to both sides of the curing device and is connected to the rear end of the first transport chain. The air outlet of the heater is connected to the third air knife. The third air knife is respectively arranged above and below the bearing plane of the third transport chain.

[0021] Specifically, the workpiece surface spraying equipment further includes a defoaming device, which is disposed between the spraying device and the curing device. By providing the defoaming device, bubbles can be removed from the coating of the workpiece after spraying and before curing, thereby improving the spraying effect.

[0022] Specifically, the defoaming device includes a fourth transport chain, a lifting device, a sealing cavity, a vacuuming device, and a sealing cover. The fourth transport chain is arranged parallel to both sides of the curing device. The sealing cavity is connected to the output end of the lifting device and located below the bearing plane of the fourth transport chain. The vacuuming device is connected to the sealing cavity. The sealing cover is fixedly arranged above the bearing plane of the fourth transport chain.

[0023] A spraying method includes the following steps: placing a workpiece on a rotating frame, driving the rotating frame to rotate so that the workpiece is rotated from a horizontal state to a vertical state; spraying the side of the workpiece using a spraying mechanism; and blowing air onto the coating on the side of the workpiece using a first air knife to smooth the coating. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the workpiece surface spraying equipment of the present invention.

[0025] Figure 2 This is a structural diagram of the spraying device of the workpiece surface spraying equipment of the present invention.

[0026] Figure 3 This is a side view of the spraying device of the workpiece surface spraying equipment of the present invention.

[0027] Figure 4 This is a side view of the spraying device of the present invention after the rotating frame has been flipped to a vertical position.

[0028] Figure 5 This is a perspective view of the rotating frame and rotating drive mechanism in the spraying device of the present invention.

[0029] Figure 6 This is a side view of the rotating frame and rotating drive mechanism in the spraying device of the present invention.

[0030] Figure 7 This is a structural diagram of the rotating frame in the spraying device of the present invention.

[0031] Figure 8 This is a structural diagram of the fixture and the workpiece in the workpiece surface spraying equipment of the present invention.

[0032] Figure 9 This is a structural diagram of the cleaning device of the workpiece surface spraying equipment of the present invention.

[0033] Figure 10 This is a structural diagram of the defoaming device and curing device of the workpiece surface spraying equipment of the present invention.

[0034] Figure 11 This is a cross-sectional view of the defoaming device and curing device of the workpiece surface spraying equipment of the present invention.

[0035] Figure 12This is a flowchart of the spraying method of the present invention. Detailed Implementation

[0036] To illustrate the technical content, structural features, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0037] like Figures 1 to 4 As shown, the workpiece surface spraying equipment 100 of the present invention is suitable for spraying the surface of a workpiece 300. In this embodiment, the workpiece 300 is a PCB board with LED lights, which has a flat plate structure. By spraying a layer of waterproof material onto the PCB board, a protective layer is formed on the surface and bottom of the PCB board. The workpiece surface spraying equipment 100 includes a spraying device 1, which includes a frame 11, a first transport chain 12, a rotating frame 13, a rotating drive mechanism 14, a spraying mechanism 15, and a first air knife 16. There are two first transport chains 12, which are respectively arranged parallel to each other on both sides of the frame 11. They are driven by a motor, gears, and racks to form a conveying direction along the front and rear directions of the frame 11. The workpiece 300 is transversely arranged on the two first transport chains 12; the first transport chains 12 form a bearing plane to support the workpiece 300. The output end of the rotary drive mechanism 14 is connected to the rotary frame 13 to drive the rotary frame 13 to rotate between a horizontal state and a vertical state; the spraying mechanism 15 and the first air knife 16 are disposed on the bearing plane of the first transport chain 12 so that when the rotary frame 13 rotates to the vertical state, the spraying mechanism 15 sprays the surface of the workpiece 300 and the first air knife 16 smooths the coating on the surface of the workpiece 300.

[0038] Please see Figure 2 , Figures 5 to 7 Specifically, the rotating frame 13 is pivotally connected to the frame 11, with its pivot center axis parallel to the bearing plane and perpendicular to the conveying direction of the first transport chain 12. The rotating frame 13 has a U-shaped structure, with pivot shafts 131 extending vertically from both ends of the U-shape. These pivot shafts 131 are rotatably connected to the frame 11. In the lateral state, the rotating frame 13 is located below the bearing plane of the first transport chain 12. The rotation drive mechanism 14 is disposed on both sides of the rotating frame 13, and includes a cylinder 141 and a swing arm 142. One end of the cylinder 141 is pivotally connected to the outside of the frame 11, and its output end is pivotally connected to one end of the swing arm 142. The other end of the swing arm 142 is fixedly connected to the pivot shaft 131 of the rotating frame 13.

[0039] Please see Figures 3 to 4The frame 11 is equipped with a limiting plate 17 to prevent the rotating frame 13 from over-twisting. The limiting plate 17 is located above the first transport chain 12 and is vertically arranged. When the rotating frame 13 rotates to a vertical position, one end of the rotating frame 13 is close to the limiting plate 17. At this time, one of the spraying mechanisms 15 and one of the first air knives 16 are located on the front side of the rotating frame 13, while the other spraying mechanism 15 and the other first air knife 16 are located on the rear side of the rotating frame 13. This allows for simultaneous spraying and air smoothing of both opposite sides of the workpiece 300, greatly improving production efficiency.

[0040] Please see Figure 2 , Figures 5 to 8 The rotating frame 13 has positioning plates 132 on its upper side and positioning blocks 133 on its lower side at both ends. The positioning plates 132 are fixed to one side of the end of the rotating frame 13 and form a channel 134 between them and the side of the rotating frame 13 for the workpiece 300 to pass through. The positioning plates 132 rotate with the rotating frame 13 to limit the side of the workpiece 300 when it is flipped. The positioning blocks 133 are disposed on the frame 11 and have arc-shaped grooves 1331 to limit the end of the workpiece 300 when it is flipped. This allows the workpiece 300 to be positioned when it is flipped with the rotating frame 13, ensuring the accuracy of the position of the workpiece 300 during spraying. In addition, the workpiece surface spraying equipment 100 of the present invention also includes a fixture 200, which is used to load the workpiece 300. The fixture 200 has a square frame structure with a hollow center. In this embodiment, a support foot is provided at each of the four corners of the bottom surface of the workpiece 300, and a magnet is provided on at least one of the support feet or the fixture 200. The workpiece 300 and the fixture 200 can be attracted to each other by the magnets to achieve the positioning of the workpiece 300, and the fixture 200 is transported to the top of the rotating frame 13 by the first transport chain 12. When the rotating frame 13 flips, it lifts the fixture 200, and the fixture 200 flips with the rotating frame 13 under the limiting action of the rotating frame 13, the positioning plate 132, and the positioning block 133.

[0041] For example Figures 2 to 4As shown, the spraying device 1 further includes a spraying drive mechanism 18 and an air knife drive mechanism 19. The spraying drive mechanism 18 is mounted on the frame 11, and its output end is connected to the spraying mechanism 15. The spraying drive mechanism 18 includes a vertical drive 181 and a horizontal drive 182. The vertical drive 181 is mounted on the frame 11, and its output end is connected to the horizontal drive 182 to drive its vertical movement. The output end of the horizontal drive 182 is connected to the spraying mechanism 15 to drive its horizontal movement. By setting the spraying drive mechanism 18, the spraying mechanism 15 is movable, thereby enabling it to spray the workpiece 300 from top to bottom along the vertical direction of the workpiece 300. The air knife drive mechanism 19 is mounted on the frame 11, and its output end is connected to the first air knife 16 to drive the first air knife 16 to move in the up and down directions. This allows the first air knife 16 to be movable, enabling it to smooth the coating on the workpiece 300 from top to bottom along the vertical direction of the workpiece 300. In this embodiment, the vertical actuator 181, the horizontal actuator 182, and the air knife drive mechanism 19 are all cylinders, but are not limited to cylinders.

[0042] Please see again Figure 3 , Figure 5 and Figure 6 The spraying device 1 further includes movable limiting members 110 and limiting drivers 120 disposed at both ends of the rotating frame 13. The limiting members 110 are located at the end of the rotating frame 13 along the conveying direction of the first transport chain 12. The limiting members 110 can approach the bearing plane to block the workpiece 300 from advancing or move away from the bearing plane to release the workpiece 300. The limiting drivers 120 are disposed on the inner side of the frame 11 and their output end is connected to the limiting members 110 to drive the limiting members 110 to move. The limiting drivers 120 are cylinders. By setting the movable limiting members 110, the workpiece 300 can be accurately positioned above the rotating frame 13 during limiting, thereby providing a positioning reference for the workpiece 300 so that the rotating frame 13 can accurately lift the workpiece 300.

[0043] For example Figures 2 to 4 As shown, the spraying device 1 also includes a recycling device 130, which includes a recycling tray 130a and a recycling system. The recycling tray 130a is disposed on the frame 11 and located below the rotating frame 13. The recycling tray 130a is connected to the recycling system, which in turn can be connected to the spraying mechanism 15, allowing the spraying mechanism 15 to reuse the recycled paint. The recycling device 130 can recycle paint blown off the workpiece 300, thereby improving paint utilization and saving costs.

[0044] Please see Figure 1 and Figure 9 The workpiece surface spraying equipment 100 also includes a cleaning device 2, which is located in front of the spraying device 1. The cleaning device 2 can clean the sides of the workpiece 300 before spraying, preventing impurities from adhering to the surface of the workpiece 300 and causing spraying defects, thus effectively improving the spraying effect. Specifically, the cleaning device 2 includes a second transport chain 21 and a second air knife 22. The second transport chain 21 is arranged parallel to both sides of the cleaning device 2 and connects to the front end of the first transport chain 12, with its conveying direction being the same as that of the first transport chain 12. The second air knife 22 is respectively located above and below the bearing plane of the second transport chain 21. By simultaneously blowing air onto the surface and bottom of the workpiece 300 using the second air knife 22, the workpiece 300 can be cleaned quickly and conveniently.

[0045] Please see Figure 1 , Figure 10 and Figure 11 The workpiece surface spraying equipment 100 also includes a curing device 3, which is located behind the spraying device 1. This curing device allows the coating on the workpiece 300 to cure rapidly after spraying, thereby improving spraying quality and production efficiency. Specifically, the curing device 3 includes a third transport chain 31, a heater, and a third air knife 32. The third transport chain 31 is arranged parallel to both sides of the curing device 3 and connects to the rear end of the first transport chain 12, with its conveying direction being the same as that of the first transport chain 12. The heater heats the air inside the third air knife 32 to cause it to blow out hot air. The third air knife 32 is respectively positioned above and below the bearing plane of the third transport chain 31. The third air knife 32 blows hot air onto the surface and sides of the workpiece 300 to accelerate the curing of the coating.

[0046] Please see again Figure 1 , Figure 10 and Figure 11The workpiece surface spraying equipment 100 further includes a defoaming device 4, which is disposed between the spraying device 1 and the curing device 3. By providing the defoaming device 4, bubbles can be removed from the coating of the workpiece 300 after spraying and before curing, thereby improving the spraying effect. Specifically, the defoaming device 4 includes a fourth transport chain 41, a lifting device 42, a sealing cavity 43, a vacuuming device, and a sealing cover 44. The fourth transport chain 41 is arranged parallel to both sides of the curing device 3, and its conveying direction is the same as that of the first transport chain 12. The sealing cavity 43 is connected to the output end of the lifting device 42 and is located below the bearing plane of the fourth transport chain 41. The vacuuming device is connected to the sealing cavity 43. The sealing cover 44 is fixedly disposed above the bearing plane of the fourth transport chain 41. The lifting device 42 can push the sealing cavity 43 upward, so that the sealing cavity 43 lifts the workpiece 300 and seals it with the sealing cover 44.

[0047] The first air knife 16, the second air knife 22 and the third air knife 32 of this application are all connected to a pneumatic output device so that the blown air has a certain speed and pressure.

[0048] Please see Figure 12 The spraying method of the present invention includes the following steps:

[0049] Step S1: Install the workpiece 300 on the fixture 200 and clean the surface of the workpiece 300 using the cleaning device 2;

[0050] Step S2: Place the fixture 200 on the rotating frame 13 and drive the rotating frame 13 to flip the workpiece 300 from a horizontal state to a vertical state;

[0051] Step S3: Spray the side of the workpiece 300 using the spraying mechanism 15;

[0052] Step S4: Use the first air knife 16 to blow air onto the coating on the side of the workpiece 300 to smooth the coating.

[0053] Step S5: Drive the rotating frame 13 to flip the workpiece 300 from the vertical state to the horizontal state;

[0054] Step S6: Use the defoaming device 4 to defoam the workpiece;

[0055] Step S7: Use curing device 3 to cure the coating on the surface of the workpiece.

[0056] Based on the above and in conjunction with the accompanying drawings, the working principle and specific spraying steps of the workpiece surface spraying equipment 100 are described in detail below:

[0057] During operation, the fixture 200, carrying the workpiece 300, is first placed on the second transport chain 21 of the cleaning device 2 and moves under the drive of the second transport chain 21. As it passes the second air knife 22, the air curtain blown out by the second air knife 22 blows away dust or impurities from the surface of the workpiece 300. Then, the second transport chain 21 transfers the fixture 200 to the first transport chain 12, which moves the fixture 200. At this time, the limit actuator 120 drives the limit member 110 to move down to the bearing platform of the first transport chain 12. When the fixture 200 moves to the limit member 110, it stops moving under the obstruction of the limit member 110. At this point, the fixture 200 is directly above the rotating frame 13, and one end of the fixture 200 is located in the channel 134 between the positioning plate 132 and the rotating frame 13. The rotary drive mechanism 14 drives the rotating frame 13 to rotate upwards towards the limiting plate 17, lifting the fixture 200 at the start of the rotation. The fixture 200 rotates along with the rotating frame 13 under the positioning action of the positioning plate 132. When the rotating frame 13 rotates to a vertical position, the spraying drive mechanism 18 drives the spraying mechanism 15 laterally towards the side of the workpiece 300, and then drives the spraying mechanism 15 to move downwards. Simultaneously, the spraying mechanism 15 sprays paint onto the side of the workpiece 300. During the downward movement of the spraying mechanism 15, the air knife drive mechanism 19 drives the first air knife 16 to move downwards, and the first air knife 16 sprays a curtain of paint onto the side of the workpiece 300. The curtain blows excess paint adhering to the surface of the workpiece 300 downwards onto the collection tray 130a. During this process, the spraying mechanisms 15 and the first air knife 16 on both sides of the workpiece 300 work simultaneously, that is, spraying both sides of the workpiece 300 at the same time. After spraying is completed, the rotary drive mechanism 14 drives the rotating frame 13 to flip downward. When it flips onto the bearing plane of the first transport chain 12, the two sides of the fixture 200 will again be supported on the first transport chain 12, while the rotating frame 13 continues to flip downward to a horizontal state. At this time, the limit driver 120 drives the limit member 110 to move upward away from the bearing plane of the first transport chain 12, and the fixture 200 continues to move with the first transport chain 12 without being blocked by the limit member 110. Afterward, the fixture 200 reaches the fourth transport chain 41 and, driven by the fourth transport chain 41, reaches directly above the sealing cavity 43. At this time, the lifting device 42 drives the sealing cavity 43 to rise. When the sealing cavity 43 and the sealing cover 44 merge, the workpiece 300 is located inside the sealing cavity 43. Then, the vacuuming device evacuates the sealing cavity 43. Under vacuum, the bubbles in the coating will burst and be released, thereby achieving the defoaming effect.After defoaming is completed, the vacuum in the sealed cavity 43 is released, and the sealed cavity 43 descends under the drive of the lifting device 42. Then, the fixture 200, driven by the fourth transport chain 41, reaches the third transport chain 31. The third transport chain 31 moves the fixture 200 and passes it through the third air knife 32. The third air knife 32 blows a hot air curtain onto the surface and bottom of the workpiece 300, smoothing the coating again and heating and curing it. Finally, the third transport chain 31 delivers the fixture 200, and the workpiece 300 is now coated.

[0058] Compared with the prior art, this invention achieves automatic and rapid spraying by setting a rotatable rotating frame 13 on the frame 11, using a rotating drive mechanism 14 to drive the rotating frame 13 from a horizontal state to a vertical state, and then setting a spraying mechanism 15 to spray the two surfaces of the workpiece 300. Furthermore, by setting a first air knife 16, the coating on the workpiece 300 is smoothed, achieving a uniform and even coating. Excess paint can be recycled with the airflow, avoiding excessive coating thickness and waste, effectively improving paint utilization. In addition, a cleaning device 2 is set before spraying, and a defoaming device 4 and a curing device 3 are set after spraying, making the entire process of spraying the workpiece 300 automated, resulting in high production efficiency and good spraying effect.

[0059] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention shall still fall within the scope of the present invention.

Claims

1. A workpiece surface spraying apparatus, characterized by: The spraying device comprises a rack, a rotating frame, a spraying mechanism and a first air knife. The rotating frame is used to carry a workpiece and is pivotally connected to the rack to switch the workpiece between a horizontal state and a vertical state. The spraying mechanism is arranged on the rack and sprays a coating on the surface of the workpiece. The first air knife is arranged on the rack and blows and smoothes the coating on the surface of the workpiece. The workpiece surface spraying equipment further comprises a rotating driving mechanism and a first conveying chain. The rotating driving mechanism drives the rotating frame to flip between the horizontal state and the vertical state. The first conveying chain is arranged in parallel on both sides of the rack to horizontally carry the workpiece on the first conveying chain. The rotating frame is located below the carrying plane of the first conveying chain in the horizontal state. The spraying mechanism and the first air knife are arranged above the carrying plane of the first conveying chain. The upper side of both ends of the rotating frame is provided with a positioning plate, and the lower side is provided with a positioning block. The positioning plate is fixed to one side of the end of the rotating frame and forms a channel for the workpiece to pass between the side surface of the rotating frame. The positioning plate rotates with the rotating frame and limits the side surface of the workpiece when it is flipped. The positioning block is arranged on the rack and has an arc-shaped groove to limit the end of the workpiece when it is flipped.

2. The workpiece surface spraying apparatus of claim 1, wherein: The workpiece surface spraying equipment further comprises a jig for loading the workpiece. At least one of the workpiece and the jig is provided with a magnet to attract and position each other.

3. The workpiece surface spraying apparatus of claim 1, wherein: The spraying device further comprises a spraying driving mechanism arranged on the rack and connected to the spraying mechanism at the output end to drive the spraying mechanism to move along the surface of the workpiece.

4. The workpiece surface spraying apparatus of claim 1, wherein: The spraying device further comprises an air knife driving mechanism arranged on the rack and connected to the first air knife at the output end to drive the first air knife to move along the surface of the workpiece.

5. The workpiece surface spraying apparatus of claim 1, wherein: The rack is provided with a limiting plate to prevent the rotating frame from being flipped excessively.

6. The workpiece surface spraying apparatus of claim 1, wherein: When the rotating frame is in the vertical state, the spraying mechanism and the first air knife are located on the front and rear sides of the rotating frame.

7. The workpiece surface spraying apparatus of claim 1, wherein: The spraying device further comprises a movable limiting member and a limiting driver. The limiting member is located at the end of the rotating frame in the conveying direction of the first conveying chain. The limiting member can be close to the carrying plane to block the workpiece or away from the carrying plane to release the workpiece. The limiting driver is arranged on the inner side of the rack and connected to the limiting member at the output end to drive the limiting member to move.

8. The workpiece surface spraying apparatus of claim 1, wherein: The spraying device further comprises a recycling device comprising a recycling disc arranged below the rotating frame.

9. The workpiece surface spraying apparatus of claim 1, wherein: The workpiece surface spraying equipment further comprises a cleaning device arranged in front of the spraying device.

10. The workpiece surface spraying apparatus of claim 9, wherein: The cleaning device comprises a second conveying chain and a second air knife. The second conveying chain is arranged in parallel on both sides of the cleaning device and is connected to the front end of the first conveying chain. The second air knife is arranged above and below the carrying plane of the second conveying chain, respectively.

11. The workpiece surface spraying apparatus of claim 1, wherein: The workpiece surface spraying device further comprises a curing device arranged behind the spraying device.

12. The workpiece surface spraying apparatus of claim 11, wherein: The curing device comprises a third conveying chain, a heater and a third air knife, the third conveying chain is arranged in parallel on both sides of the curing device and is connected with the rear end of the first conveying chain, the air outlet of the heater is communicated with the third air knife, and the third air knife is arranged above and below the bearing plane of the third conveying chain respectively.

13. The workpiece surface spraying apparatus of claim 11, wherein: The workpiece surface spraying device further comprises a bubble removing device arranged between the spraying device and the curing device.

14. The workpiece surface spraying apparatus of claim 13, wherein: The bubble removing device comprises a fourth conveying chain, a lifting device, a sealed cavity, a vacuumizing device and a sealing cover, the fourth conveying chain is arranged in parallel on both sides of the curing device, the sealed cavity is connected with the output end of the lifting device and is arranged below the bearing plane of the fourth conveying chain, and the vacuumizing device is communicated with the sealed cavity; and the sealing cover is fixedly arranged above the bearing plane of the fourth conveying chain.

15. A spraying method using the workpiece surface spraying apparatus according to any one of claims 1 to 14, characterized by, The method comprises the following steps: loading the workpiece on the jig; moving the jig by the first conveying chain to make the jig located in the channel between the positioning plate and the rotating frame, so as to arrange the workpiece on the rotating frame; turning the rotating frame by the rotating driving mechanism to turn the workpiece from the horizontal state to the vertical state; simultaneously spraying the two side surfaces of the workpiece by the spraying mechanism; blowing the coating on the two side surfaces of the workpiece by the first air knife to smooth the coating; turning the rotating frame by the rotating driving mechanism to turn the workpiece from the vertical state to the horizontal state, so as to make the workpiece bear on the first conveying chain.

16. The spray coating method of claim 15, wherein, After the coating is smoothed, the method further comprises the following step: removing the bubbles on the workpiece by the bubble removing device.

17. The spray coating method of claim 16, wherein, After the coating is smoothed, the method further comprises the following step: curing the coating on the surface of the workpiece by the curing device.

18. The spray coating method of claim 15, wherein: Before turning the rotating frame, the method further comprises the following step: cleaning the surface of the workpiece by the cleaning device.

Images