CN218394359U

CN218394359U - Workpiece surface spraying equipment

Info

Publication number: CN218394359U
Application number: CN202220882174.5U
Authority: CN
Inventors: 张钊
Original assignee: Guangdong Qunwang Technology Co ltd
Current assignee: Guangdong Qunwang Technology Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2023-01-31
Anticipated expiration: 2032-04-15

Abstract

The utility model discloses a workpiece surface spraying device, which comprises a spraying device, wherein the spraying device comprises a frame, a rotating frame, a spraying mechanism and a first air knife; the rotating frame is pivoted to the rack so as to be switched between a horizontal state and a vertical state; the spraying mechanism is arranged on the rack and is used for spraying a coating on the surface of the workpiece; the first air knife is arranged on the rack and is used for blowing and leveling a coating on the surface of the workpiece. The utility model discloses work piece surface spraying equipment production efficiency is high, the spraying is even, and the coating utilization ratio is high.

Description

Workpiece surface spraying equipment

Technical Field

The utility model relates to a spraying equipment especially relates to a workpiece surface spraying equipment.

Background

When producing a PCB with LEDs, a coating is generally applied to the surface to protect the circuit. The existing smearing modes mainly comprise spraying, dip-coating, brush coating and the like. The brushing method needs to brush the two sides of the PCB respectively, and has the disadvantages of slow speed, uneven brushing and poor effect; the dip-coating spraying mode can be used for simultaneously coating two surfaces of the PCB with coatings, the production speed is high, but the consumption of the dip-coating coatings is high, the cost is high, and the production is not facilitated; the spraying is to spray paint on the surface of the PCB by using a spray head, and although the spraying speed is high, the defects of uneven spraying and low paint utilization rate still need to exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic spraying, production efficiency is high, the spraying is even, the coating high-usage's workpiece surface spraying equipment.

In order to achieve the above object, the utility model provides a workpiece surface spraying equipment, which comprises a spraying device, wherein the spraying device comprises a frame, a rotating frame, a spraying mechanism and a first air knife; the rotating frame is used for bearing a workpiece and is pivoted to the rack so as to drive the workpiece to be switched between a horizontal state and a vertical state; the spraying mechanism is arranged on the rack and is used for spraying a coating on the surface of the workpiece; the first air knife is arranged on the rack and is used for blowing and leveling a coating on the surface of the workpiece.

Compared with the prior art, because the utility model discloses a set up the swivel mount that can overturn in the frame, through the drive the swivel mount is from horizontal horizontality upset to vertical state, sets up spraying mechanism again and carries out the spraying to two surfaces of work piece to realize automatic quick spraying. And through setting up first air knife, utilize first air knife blows the flat to the coating of work piece to can reach the purpose of even floating the coating, and unnecessary coating can flow out with the wind and retrieve, avoid the coating too thick to cause the waste, effectively improve the utilization ratio of coating.

Preferably, the workpiece surface spraying equipment further comprises a rotary driving mechanism, and the rotary driving mechanism drives the rotary frame to turn between a horizontal state and a vertical state. Utilize the rotary driving mechanism drive the swivel mount can make the spraying more automatic, improves the production efficiency of spraying.

Preferably, the workpiece surface spraying equipment further comprises first conveying chains, and the first conveying chains are arranged on two sides of the rack in parallel so that the workpiece is borne on the two first conveying chains in a crossing manner; the rotating frame is positioned below the bearing plane of the first conveying chain in a transverse state; the spraying mechanism and the first air knife are arranged on the bearing plane of the first conveying chain.

Preferably, the workpiece surface spraying equipment further comprises a jig for loading the workpiece, and at least one of the workpiece and the rotating frame is provided with a magnet so that the workpiece and the rotating frame can be attracted and positioned with each other.

Preferably, the spraying device further comprises a spraying driving mechanism, the spraying driving mechanism is arranged on the rack, and the output end of the spraying driving mechanism is connected with the spraying mechanism so as to drive the spraying mechanism to move along the surface of the workpiece. Through setting up the spraying actuating mechanism makes the spraying mechanism is portable to make it can be along the vertical direction of work piece is from last to spraying work piece down.

Preferably, the spraying device further comprises an air knife driving mechanism, the air knife driving mechanism is arranged on the rack, and an output end of the air knife driving mechanism is connected with the first air knife so as to drive the first air knife to move along the surface of the workpiece. This allows the first air knife to level the coating of the workpiece from top to bottom along the vertical direction of the workpiece.

Preferably, the rack is provided with a limiting plate for preventing the rotating frame from being overturned excessively.

Preferably, when the rotating frame is in a vertical state, the spraying mechanism and the first air knife are both positioned at the front side and the rear side of the rotating frame. Therefore, the two opposite side surfaces of the workpiece can be sprayed and blown flatly at the same time, and the production efficiency is greatly improved.

Preferably, 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 along the conveying direction of the first conveying chain, and the limiting member can approach the bearing plane to block the workpiece from advancing or move away from the bearing plane to release the workpiece; the limiting driver is arranged on the inner side of the rack, and the output end of the limiting driver is connected with the limiting part so as to drive the limiting part to move. Through the movable limiting part, the workpiece can accurately reach the upper part of the rotating frame during limiting, so that a positioning reference is provided for the workpiece, and the workpiece can be accurately supported by the rotating frame.

Preferably, the upper sides of the two ends of the rotating frame are provided with positioning plates, the lower sides of the two ends of the rotating frame are provided with positioning blocks, the positioning plates are fixed on the rotating frame and rotate along with the rotating frame so as to limit the side faces of the workpiece during overturning, and the positioning blocks are arranged on the rack and are provided with arc-shaped grooves so as to limit the end portions of the workpiece during overturning. Therefore, the workpiece can be positioned when the workpiece is turned over along with the rotating frame, and the position of the workpiece is accurate during spraying.

Preferably, the spraying device further comprises a recovery device, wherein the recovery device comprises a recovery disc, and the recovery disc is arranged below the rotating frame. The recovery device can recycle the coating blown off from the workpiece, so that the utilization rate of the coating is improved, and the cost is saved.

Preferably, the workpiece surface spraying equipment further comprises a cleaning device which is arranged in front of the spraying device. The cleaning device can clean the side surface of the workpiece before spraying, so that the defect of spraying caused by the adhesion of impurities on the surface of the workpiece is avoided, and the spraying effect is effectively improved.

Specifically, the cleaning device comprises a second conveying chain and a second air knife, the second conveying chain is arranged on two sides of the cleaning device in parallel and is in butt joint with the front end of the first conveying chain, and the second air knife is arranged above and below the bearing plane of the second conveying chain respectively. The second air knife is utilized to blow air to the surface and the bottom surface of the workpiece simultaneously, so that the workpiece can be cleaned quickly and conveniently.

Preferably, the workpiece surface spraying equipment further comprises a curing device, and the curing device is arranged behind the spraying device. The fixing device can be used for quickly curing the coating of the workpiece after the spraying is finished, so that the spraying quality is improved, and the production efficiency is improved.

Specifically, the curing device comprises a third conveying chain, a heater and a third air knife, the third conveying chain is arranged on two sides of the curing device in parallel and is in butt joint with the rear end of the first conveying chain, an air outlet of the heater is communicated with the third air knife, and the third air knife is arranged above and below a bearing plane of the third conveying chain respectively.

Specifically, the workpiece surface spraying equipment further comprises a bubble removing device, and the bubble removing device is arranged between the spraying device and the curing device. Through setting up remove the bubble device, can remove the bubble to the coating of work piece after the spraying is accomplished and before the solidification to make the spraying effect better.

The bubble removing device comprises a fourth conveying chain, a lifting device, a sealing cavity, a vacuumizing device and a sealing cover, wherein the fourth conveying chain is arranged on two sides of the curing device in parallel, the sealing cavity is connected to the output end of the lifting device and located below the bearing plane of the fourth conveying chain, and the vacuumizing device is communicated with the sealing cavity; the sealing cover is fixedly arranged above the bearing plane of the fourth conveying chain.

Drawings

Fig. 1 is a structural diagram of the workpiece surface spraying device of the present invention.

Fig. 2 is a structural diagram of a spraying device of the workpiece surface spraying equipment of the invention.

Fig. 3 is a side view of the spraying device of the workpiece surface spraying apparatus of the present invention.

Fig. 4 is a side view of the rotary frame of the spraying device of the present invention after being turned to the vertical state.

Fig. 5 is a perspective view of the rotary frame and the rotary driving mechanism of the spraying device of the present invention.

Fig. 6 is a side view of the rotary frame and the rotary driving mechanism of the spraying device of the present invention.

Fig. 7 is a structural view of a rotary frame in the coating apparatus of the present invention.

Fig. 8 is a structural diagram of the jig and the workpiece of the workpiece surface spraying device of the present invention.

Fig. 9 is a structural diagram of a cleaning device of the workpiece surface spraying equipment of the present invention.

FIG. 10 is a schematic diagram of the bubble removing device and the solidifying device of the workpiece surface spraying apparatus of the present invention.

Fig. 11 is a sectional view of the bubble removing device and the solidifying device of the workpiece surface spraying device of the present invention.

Fig. 12 is a flow chart of the spraying method of the present invention.

Detailed Description

In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

As shown in fig. 1 to 4, the workpiece surface spraying apparatus 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 lamps, and is of a flat plate structure, and a layer of waterproof material is sprayed on the PCB board, so that the surface and the bottom surface of the PCB board form a protective layer. The workpiece surface spraying equipment 100 comprises a spraying device 1, wherein the spraying device 1 comprises a rack 11, a first conveying chain 12, a rotating frame 13, a rotary driving mechanism 14, a spraying mechanism 15 and a first air knife 16. The number of the first transportation chains 12 is two, the first transportation chains are respectively arranged on two sides of the rack 11 in parallel, and the transportation direction along the front and back directions of the rack 11 is formed by driving of a motor, a gear and a rack. The workpieces 300 are arranged across the two first conveying chains 12; the first transport chain 12 forms a bearing plane to bear the workpiece 300. The output end of the rotation driving mechanism 14 is connected with the rotating frame 13 to drive the rotating frame 13 to rotate between a horizontal state and a vertical state; the spraying mechanism 15 and the first air knife 16 are disposed above a bearing plane of the first conveying chain 12, so that when the rotating frame 13 rotates to the vertical state, the surface of the workpiece 300 is sprayed by the spraying mechanism 15 and the coating on the surface of the workpiece 300 is smoothed by the first air knife 16.

Referring to fig. 2, 5 to 7, specifically, the rotating frame 13 is pivoted on the frame 11, and a pivoting central axis is parallel to the bearing plane and perpendicular to the conveying direction of the first conveying chain 12. The rotating frame 13 is U-shaped, and two ends of the U-shape are vertically extended with a pivot shaft 131, and the pivot shaft 131 is rotatably connected to the frame 11. The rotating frame 13 is located below the bearing plane of the first transport chain 12 in the transverse state. The rotation driving mechanism 14 is disposed on two sides of the rotating frame 13, and includes a cylinder 141 and a swing rod 142, one end of the cylinder 141 is pivoted to the outside of the rack 11, an output end of the cylinder is pivoted to one end of the swing rod 142, and the other end of the swing rod 142 is fixedly connected to the pivot shaft 131 of the rotating frame 13.

Referring to fig. 3 to 4, a limiting plate 17 for preventing the rotating frame 13 from being turned over excessively is disposed on the frame 11. The limiting plate 17 is located above the first conveying chain 12 and the limiting plate 17 is vertically arranged. When the rotating frame 13 rotates to be in the vertical state, one end of the rotating frame 13 is close to the limiting plate 17, and at this time, one of the spraying mechanisms 15 and one of the first air knives 16 are located at the front side of the rotating frame 13, and the other of the spraying mechanisms 15 and the other of the first air knives 16 are located at the rear side of the rotating frame 13. Therefore, the two opposite side surfaces of the workpiece 300 can be simultaneously sprayed and simultaneously blown to be leveled, and the production efficiency is greatly improved.

Referring to fig. 2, 5 to 8, the upper sides of the two ends of the rotating frame 13 are both provided with a positioning plate 132, the lower sides of the two ends of the rotating frame 13 are both provided with a positioning block 133, the positioning plate 132 is fixed to one side of the end of the rotating frame 13 and forms a channel 134 for a workpiece 300 to pass through with the side surface of the rotating frame 13, and the positioning plate 132 rotates along with the rotating frame 13 to limit the side surface of the workpiece 300 during turning. The positioning block 133 is disposed on the frame 11 and has an arc-shaped groove 1331 to limit an end of the workpiece 300 when turning. Therefore, the workpiece 300 can be positioned when being overturned along with the rotating frame 13, and the position of the workpiece 300 is ensured to be accurate during spraying. Additionally, the utility model discloses workpiece surface spraying equipment 100 still includes tool 200, utilizes tool 200 loads work piece 300, tool 200 is the square frame column structure of middle fretwork. In this embodiment, a supporting leg is disposed at four corners of the bottom surface of the workpiece 300, and a magnet is disposed on at least one of the supporting leg or the jig 200. The workpiece 300 and the jig 200 can be attracted to each other by the magnets, so that the workpiece 300 is positioned, and the jig 200 is conveyed to the upper part of the rotating frame 13 by the first conveying chain 12. The jig 200 is supported when the rotating frame 13 is turned, and the jig 200 is turned along with the rotating frame 13 under the limiting effect of the rotating frame 13, the positioning plate 132 and the positioning block 133.

As shown in fig. 2 to 4, the spraying device 1 further includes a spraying driving mechanism 18 and an air knife driving mechanism 19, wherein the spraying driving mechanism 18 is disposed on the frame 11, and an output end of the spraying driving mechanism 18 is connected to the spraying mechanism 15. The spraying driving mechanism 18 includes a vertical driver 181 and a horizontal driver 182, the vertical driver 181 is disposed on the rack 11, and an output end of the vertical driver 181 is connected to the horizontal driver 182 to drive the horizontal driver to move vertically, and an output end of the horizontal driver 182 is connected to the spraying mechanism 15 to drive the horizontal driver to move horizontally. By providing the coating driving mechanism 18, the coating mechanism 15 is made movable so that it can coat the workpiece 300 from top to bottom in the vertical direction of the workpiece 300. The air knife driving mechanism 19 is disposed on the frame 11, and an output end of the air knife driving mechanism is connected to the first air knife 16 to drive the first air knife 16 to move up and down. This allows the first air knife 16 to be movable so that it can level the coating of the workpiece 300 from top to bottom along the vertical direction of the workpiece 300. The vertical driver 181, the horizontal driver 182, and the air knife driving mechanism 19 of the present embodiment are all cylinders, but are not limited to cylinders.

Referring to fig. 3, 5 and 6, the spraying device 1 further includes a movable limiting element 110 and a limiting driver 120 disposed at two ends of the rotating frame 13, the limiting element 110 is located at a tail end of the rotating frame 13 along the conveying direction of the first conveying chain 12, and the limiting element 110 can approach the bearing plane to block the workpiece 300 from advancing or moving away from the bearing plane to release the workpiece 300. The limiting driver 120 is disposed inside the frame 11 and has an output end connected to the limiting member 110 to drive the limiting member 110 to move. The limit driver 120 is an air cylinder. By arranging the movable limiting part 110, the workpiece 300 can accurately reach the upper part of the rotating frame 13 during limiting, so that a positioning reference is provided for the workpiece 300, and the rotating frame 13 can accurately support the workpiece 300 conveniently.

As shown in fig. 2 to 4, the spraying device 1 further includes a recycling device 130, the recycling device 130 includes a recycling tray 130a and a recycling system, and the recycling tray 130a is disposed on the frame 11 and below the rotating frame 13. The recycling tray 130a is connected to the recycling system, which is also connected to the spraying mechanism 15, so that the spraying mechanism 15 can recycle the recycled paint. The recovery device 130 can be arranged to recover and recycle the coating blown off from the workpiece 300, so that the utilization rate of the coating is improved, and the cost is saved.

Referring to fig. 1 and 9, the workpiece surface spraying apparatus 100 further includes a cleaning device 2, and the cleaning device 2 is disposed in front of the spraying device 1. The cleaning device 2 can clean the side surface of the workpiece 300 before spraying, so that the spraying defect caused by the adhesion of impurities on the surface of the workpiece 300 is avoided, and the spraying effect is effectively improved. Specifically, the cleaning device 2 includes a second conveying chain 21 and a second air knife 22, the second conveying chain 21 is disposed on two sides of the cleaning device 2 in parallel and is butted against the front end of the first conveying chain 12, and the conveying direction of the second conveying chain 21 is the same as the conveying direction of the first conveying chain 12. The second air knives 22 are respectively disposed above and below the bearing plane of the second conveying chain 21. The second air knife 22 is used for blowing air to the surface and the bottom surface of the workpiece 300 simultaneously, so that the workpiece 300 can be cleaned quickly and conveniently.

Referring to fig. 1, 10 and 11, the workpiece surface spraying apparatus 100 further includes a curing device 3, and the curing device 3 is disposed behind the spraying device 1. The coating of the workpiece 300 can be quickly cured after the spraying is finished through the fixing device, so that the spraying quality is improved, and the production efficiency is improved. Specifically, the curing device 3 includes a third conveying chain 31, a heater and a third air knife 32, the third conveying chain 31 is disposed on two sides of the curing device 3 in parallel and is abutted to the rear end of the first conveying chain 12, and the conveying direction of the third conveying chain 31 is the same as the conveying direction of the first conveying chain 12. The heater may heat the air in the third air knife 32 to cause the third air knife 32 to blow the hot air. The third air knives 32 are respectively disposed above and below the bearing plane of the third conveying chain 31. The third air knife 32 blows hot air to the surface and the side surface of the workpiece 300, so that the coating of the workpiece 300 is cured quickly.

Referring to fig. 1, 10 and 11 again, the workpiece surface spraying apparatus 100 further includes a bubble removing device 4, and the bubble removing device 4 is disposed between the spraying device 1 and the curing device 3. Through setting up remove bubble device 4, can remove the bubble to the coating of work piece 300 after the spraying is accomplished and before the solidification to make the spraying effect better. Specifically, the bubble removing device 4 includes a fourth transportation chain 41, a lifting device 42, a sealing cavity 43, a vacuum pumping device and a sealing cover 44, the fourth transportation chain 41 is disposed on two sides of the curing device 3 in parallel, and the transportation direction of the fourth transportation chain 41 is the same as the transportation direction of the first transportation chain 12. The sealed cavity 43 is connected to the output end of the lifting device 42 and is located below the bearing plane of the fourth transportation chain 41, and the vacuum pumping device is communicated with the sealed cavity 43; the sealing cover 44 is fixedly arranged above the bearing plane of the fourth transport chain 41; the lifting device 42 can push the sealing cavity 43 to move upwards, so that the sealing cavity 43 can lift the workpiece 300 and be hermetically covered with the sealing cover 44.

The first air knife 16, the second air knife 22 and the third air knife 32 are all connected with an air pressure output device, so that the blown air has certain speed and pressure.

Referring to fig. 12, the spraying method of the present invention includes the following steps:

step S1, installing a workpiece 300 on a jig 200, and cleaning the surface of the workpiece 300 by using a cleaning device 2;

step S2, arranging the jig 200 on a rotating frame 13, and driving the rotating frame 13 to turn the workpiece 300 from a horizontal state to a vertical state;

step S3, spraying the side surface of the workpiece 300 by using a spraying mechanism 15;

step S4, blowing air to the coating on the side surface of the workpiece 300 by using a first air knife 16 to smooth the coating;

step S5, driving the rotating frame 13 to overturn the workpiece 300 from a vertical state to a transverse state;

s6, removing bubbles from the workpiece by using the bubble removing device 4;

and S7, curing the coating on the surface of the workpiece by using the curing device 3.

In view of the above, and with reference to the accompanying drawings, the working principle of the workpiece surface spraying apparatus 100 and the specific steps of spraying will be described in detail as follows:

during operation, the jig 200 with the workpiece 300 is first placed on the second conveying chain 21 of the cleaning device 2 and is driven by the second conveying chain 21 to move. When passing through the second air knife 22, the air curtain blown by the second air knife 22 blows away the dust or impurities on the surface of the workpiece 300. Then, the second conveying chain 21 conveys the jig 200 to the first conveying chain 12, and the first conveying chain 12 drives the jig 200 to move. At this time, the limiting driver 120 drives the limiting member 110 to move down to the carrying platform of the first transportation chain 12, when the jig 200 moves to the limiting member 110, the movement stops under the blocking of the limiting member 110, at this time, the jig 200 is located right above the rotating frame 13, and one end of the jig 200 is located in the channel 134 between the positioning plate 132 and the rotating frame 13. The rotation driving mechanism 14 can drive the rotation frame 13 to turn upwards in a direction close to the limiting plate 17, the jig 200 is dragged when the turning starts, and the jig 200 turns along with the rotation frame 13 under the positioning action of the positioning plate 132 and the positioning plate 132. When the rotating frame 13 is turned to the vertical state, the spraying driving mechanism 18 drives the spraying mechanism 15 to be laterally close to the side surface of the workpiece 300, and then drives the spraying mechanism 15 to move from top to bottom, and meanwhile, the spraying mechanism 15 sprays the side surface of the workpiece 300. In the process of moving the spraying mechanism 15 downward, the air knife driving mechanism 19 drives the first air knife 16 to move from top to bottom, and the first air knife 16 sprays a curtain to the side of the workpiece 300. The curtain blows down the excess paint adhered to the surface of the work 300 onto the recovery tray 130 a. In this process, the spraying mechanism 15 and the first air knife 16 on both sides of the workpiece 300 are operated simultaneously, that is, both sides of the workpiece 300 are sprayed simultaneously. When the spraying is finished, the rotary driving mechanism 14 drives the rotary frame 13 to turn downwards. When the jig 200 is turned over to the carrying plane of the first conveying chain 12, the two side edges of the jig 200 are carried on the first conveying chain 12 again, and the rotating frame 13 continues to be turned downward to a horizontal state. At this time, the limiting driver 120 drives the limiting member 110 to move upward away from the bearing plane of the first conveying chain 12, and the jig 200 continues to move along with the first conveying chain 12 without being blocked by the limiting member 110. Then, the jig 200 reaches the fourth conveying chain 41, and reaches the position right above the sealing cavity 43 under the driving of the fourth conveying chain 41. At this time, the lifting device 42 drives the sealing cavity 43 to ascend, and when the sealing cavity 43 is combined with the sealing cover 44, the workpiece 300 is located in the sealing cavity 43. Then, the vacuum pumping device pumps vacuum to the sealed cavity 43, and the bubbles of the coating are broken and released in the vacuum state, so as to achieve the effect of removing the bubbles. When the bubble removal is completed, the vacuum is released to the sealed cavity 43, and the sealed cavity 43 is driven to descend by the lifting device 42. Then, the jig 200 reaches the third conveying chain 31 under the driving of the fourth conveying chain 41, the third conveying chain 31 drives the jig 200 to move and pass through the third air knife 32, the third air knife 32 blows out a hot air curtain to the surface and the bottom surface of the workpiece 300, and the hot air curtain screeds the coating and heats and cures the coating again. Finally, the third conveying chain 31 sends the jig 200 out, and the workpiece 300 is sprayed.

Compared with the prior art, because the utility model discloses a set up rotatable swivel mount 13 in the frame 11, utilize the drive of rotary driving mechanism 14 swivel mount 13 is from horizontal horizontality upset to vertical state, sets up spraying mechanism 15 again and carries out the spraying to work piece 300's two surfaces to realize automatic quick spraying. In addition, by arranging the first air knife 16, the coating of the workpiece 300 is blown flat by the first air knife 16, so that the purpose of uniformly floating the coating can be achieved, redundant coating can flow out and be recycled along with wind, waste caused by over-thick coating is avoided, and the utilization rate of the coating is effectively improved. In addition, the cleaning device 2 is arranged before spraying, and the bubble removing device 4 and the curing device 3 are arranged after spraying, so that the whole process of spraying the workpiece 300 is automated, the production efficiency is high, and the spraying effect is good.

The above disclosure is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereto, and therefore, the scope of the present invention is not limited to the above embodiments.

Claims

1. A workpiece surface spraying equipment is characterized in that: the spraying device comprises a frame, a rotating frame, a spraying mechanism and a first air knife; the rotating frame is used for bearing a workpiece and is pivoted to the rack so as to drive the workpiece to be switched between a horizontal state and a vertical state; the spraying mechanism is arranged on the rack and is used for spraying a coating on the surface of the workpiece; the first air knife is arranged on the rack and used for blowing and leveling a coating on the surface of the workpiece.

2. The workpiece surface spray coating apparatus of claim 1, wherein: the workpiece surface spraying equipment further comprises a rotary driving mechanism, and the rotary driving mechanism drives the rotary frame to turn over between a horizontal state and a vertical state.

3. The workpiece surface spray coating apparatus of claim 2, wherein: the workpiece surface spraying equipment further comprises first conveying chains, wherein the first conveying chains are arranged on two sides of the rack in parallel so that the workpiece is supported on the two first conveying chains in a crossing manner; the rotating frame is positioned below the bearing plane of the first conveying chain in a transverse state; the spraying mechanism and the first air knife are arranged on the bearing plane of the first conveying chain.

4. The workpiece surface spray coating apparatus of claim 1, wherein: the workpiece surface spraying equipment further comprises a jig for loading the workpiece, and at least one of the workpiece and the jig is provided with a magnet so that the workpiece and the jig can be mutually attracted and positioned.

5. The workpiece surface spray coating apparatus of claim 1, wherein: the spraying device further comprises a spraying driving mechanism, the spraying driving mechanism is arranged on the rack, and the output end of the spraying driving mechanism is connected with the spraying mechanism so as to drive the spraying mechanism to move along the surface of the workpiece.

6. The workpiece surface spray coating apparatus of claim 1, wherein: the spraying device further comprises an air knife driving mechanism, the air knife driving mechanism is arranged on the rack, and the output end of the air knife driving mechanism is connected with the first air knife so as to drive the first air knife to move along the surface of the workpiece.

7. The workpiece surface spray coating apparatus of claim 1, wherein: and the rack is provided with a limiting plate for preventing the rotating frame from excessively overturning.

8. The workpiece surface spray coating apparatus of claim 1, wherein: when the rotating frame is in a vertical state, the spraying mechanism and the first air knife are positioned on the front side and the rear side of the rotating frame.

9. A workpiece surface coating apparatus as claimed in claim 3, wherein: the spraying device further comprises a movable limiting piece and a limiting driver, the limiting piece is located at the tail end of the rotating frame in the conveying direction of the first conveying chain, and the limiting piece can be close to the bearing plane to block the workpiece from advancing or far away from the bearing plane to release the workpiece; the limiting driver is arranged on the inner side of the rack, and the output end of the limiting driver is connected with the limiting part so as to drive the limiting part to move.

10. The workpiece surface spray coating apparatus of claim 1, wherein: the upside at the both ends of swivel mount is equipped with the locating plate, and the downside is equipped with the locating piece, the locating plate is fixed in on the swivel mount and along the swivel mount rotates with when the upset is right the side of work piece is spacing, the locating piece set up in just have the arc recess in the frame, it is right when the upset the tip of work piece is spacing.

11. The workpiece surface spray coating apparatus of claim 1, wherein: the spraying device further comprises a recovery device, the recovery device comprises a recovery disc, and the recovery disc is arranged below the rotating frame.

12. A workpiece surface coating apparatus as claimed in claim 3, wherein: the workpiece surface spraying equipment further comprises a cleaning device, and the cleaning device is arranged in front of the spraying device.

13. The workpiece surface spray coating apparatus of claim 12, wherein: the cleaning device comprises a second conveying chain and second air knives, the second conveying chain is arranged on two sides of the cleaning device in parallel and is in butt joint with the front end of the first conveying chain, and the second air knives are arranged above and below the bearing plane of the second conveying chain respectively.

14. A workpiece surface coating apparatus as claimed in claim 3, wherein: the workpiece surface spraying equipment further comprises a curing device, and the curing device is arranged behind the spraying device.

15. The workpiece surface spray coating apparatus of claim 14, wherein: the curing device comprises a third conveying chain, a heater and a third air knife, the third conveying chain is arranged on two sides of the curing device in parallel and is in butt joint with the rear end of the first conveying chain, an air outlet of the heater is communicated with the third air knife, and the third air knife is arranged above and below a bearing plane of the third conveying chain respectively.

16. The workpiece surface spray coating apparatus of claim 14, wherein: the workpiece surface spraying equipment further comprises a bubble removing device, and the bubble removing device is arranged between the spraying device and the curing device.

17. The workpiece surface spray coating apparatus of claim 16, wherein: the bubble removing device comprises a fourth conveying chain, a lifting device, a sealing cavity, a vacuumizing device and a sealing cover, the fourth conveying chain is arranged on two sides of the curing device in parallel, the sealing cavity is connected to the output end of the lifting device and is positioned below the bearing plane of the fourth conveying chain, and the vacuumizing device is communicated with the sealing cavity; the sealing cover is fixedly arranged above the bearing plane of the fourth conveying chain.