High-precision coating equipment with recovery effect and gluing method of high-precision coating equipment

Abstract

The invention discloses high-precision coating equipment with a recycling effect and a gluing method thereof.The high-precision coating equipment comprises a machining box, a spraying assembly, a glue discharging assembly and a recycling assembly, a rack is arranged in the machining box, a workbench is arranged on the rack, the spraying assembly of the workbench is arranged above the workbench, and the spraying assembly comprises a supporting plate and an atomizing valve; the glue outlet assembly comprises a pressure barrel, a pneumatic diaphragm pump and a first glue conveying pipe, the pneumatic diaphragm pump is communicated with the pressure barrel, the first glue conveying pipe is communicated with the atomization valve and the pneumatic diaphragm pump, the recycling assembly comprises a backflow net plate, a recycling box body, a negative pressure adsorption machine and a backflow pipe, a recycling opening is formed in the workbench, and the backflow net plate is arranged in the recycling opening; the recycling box body is communicated with the recycling opening, the two ends of the backflow pipe are communicated with the recycling box body and the pressure barrel respectively, and the negative pressure adsorption machine is arranged on the backflow pipe. The glue solution coating device has the effects of improving the glue solution coating quality and the utilization rate.

Description

Technical Field

[0001] The present application relates to the technical field of coating machines, and in particular to a high-precision coating device with a recycling effect and a gluing method thereof. Background Art

[0002] Coating machines are mainly used to apply liquid glue on the surface of textiles, paper boxes or leather. There are many types of existing coating machines, such as drum coating machines, double-acting coating machines, double-station lifting coating machines, etc. Coating machines use air pressure to spray liquids such as glue or paint onto the required products. Three-proof glue is also known as circuit board protection glue or coating glue. Among them, silicone three-proof glue is a silicone modified resin used to protect circuit boards and related equipment from erosion by harsh environments, thereby improving and extending the service life of the product and ensuring safety and reliability during use.

[0003] Conventional coating equipment is operated by pouring glue into a rubber cartridge and installing the rubber cartridge on a spraying device. However, the glue supply route of the rubber cartridge is long. When not used for a long time, the glue is easy to condense in the pipeline, causing pipeline blockage and wasting glue. In conventional coating equipment, the excess glue during the spraying process cannot be recovered, which pollutes the equipment table and causes waste. Summary of the invention

[0004] In order to improve the coating quality and utilization rate of glue liquid, the present application provides a high-precision coating equipment with a recycling effect and a glue coating method thereof.

[0005] The present application provides a high-precision coating device with recycling effect and a gluing method thereof, which adopts the following technical solutions: A high-precision coating equipment with a recycling effect, comprising a processing box, a spraying assembly, a glue discharging assembly and a recycling assembly, a frame is arranged in the processing box, a workbench is arranged on the frame, two upstream conveying bars are arranged in parallel on the workbench, a supporting jig is slidably arranged between the two upstream conveying bars, the workbench spraying assembly is arranged above the workbench, a lateral movement module for adjusting the position of the spraying assembly is arranged on the workbench, the spraying assembly comprises a support plate and an atomizing valve, the support plate is arranged on the lateral movement module, the atomizing valve is arranged on the support plate, the discharging assembly comprises a support plate and an atomizing valve, the support plate is arranged on the lateral movement module, the atomizing valve is arranged on the support plate, the discharging assembly comprises a support plate and a glue discharging assembly ... The glue assembly includes a pressure barrel, a pneumatic diaphragm pump and a first glue delivery pipe. The pneumatic diaphragm pump is connected to the pressure barrel, and the two ends of the first glue delivery pipe are respectively connected to the atomizing valve and the pneumatic diaphragm pump. The recovery assembly includes a reflux mesh plate, a recovery box body, a negative pressure adsorption machine and a reflux pipe. A recovery port is provided on the workbench, the reflux mesh plate is arranged in the recovery port, the recovery box body is connected to the bottom surface of the workbench and is connected to the recovery port, the two ends of the reflux pipe are respectively connected to the recovery box body and the pressure barrel, and the negative pressure adsorption machine is arranged on the reflux pipe.

[0006] By adopting the above technical solution, the circuit board to be processed is placed in the board placement slot of the supporting jig, the supporting jig is moved to the workbench, the spraying assembly is moved to the top of the circuit board under the action of the lateral movement module, and the atomizing valve sprays the glue evenly on the surface of the circuit board. The excess glue flows into the recycling box through the recycling screen. Under the action of the negative pressure adsorption machine, the glue in the recycling box flows back to the pressure barrel through the return pipe for reuse. Through the mutual cooperation of the processing box, the spraying assembly, the glue output assembly and the recycling assembly, the recycling of the glue is realized, which has the effect of improving the coating quality and utilization rate of the glue.

[0007] Optionally, the spray assembly also includes a first cylinder, a second cylinder, a needle valve and a detection camera. The first cylinder and the second cylinder are both arranged on the support plate. The output shafts of the first cylinder and the second cylinder are both arranged in the vertical direction. The first cylinder is transmission-connected to the atomizing valve, the second cylinder is transmission-connected to the needle valve, the needle valve is connected to the pneumatic diaphragm pump and a second rubber delivery hose is arranged. The detection camera is arranged on the support plate, and the detection camera is arranged downward.

[0008] By adopting the above technical solution, when applying glue to the circuit board, the first cylinder drives the atomizing valve close to the circuit board to preliminarily apply glue to the surface of the circuit board. The detection camera detects the surface of the circuit board, and the second cylinder drives the needle valve close to the circuit board to supplement the position on the circuit board surface that is not coated with glue. The two coatings help the glue to be more fully applied to the surface of the circuit board.

[0009] Optionally, one of the upstream conveying bars is slidably connected to the workbench, and an adjustment slide rail is provided on the workbench along a direction perpendicular to the upstream conveying bar, and one of the upstream conveying bars is slidably connected to the adjustment slide rail, and a driving member for driving the upstream conveying bar to move is provided on the workbench.

[0010] By adopting the above technical solution, one of the upstream conveying bars is slidably connected to the workbench through the adjusting slide rail. For supporting jigs of different specifications, the distance between the two upstream conveying bars can be adjusted by the driving member, thereby expanding the application range of the device.

[0011] Optionally, a pneumatic agitator is provided in the pressure barrel, an electronic scale is provided below the pressure barrel, the pressure barrel is placed on the electronic scale, and a self-circulating pipeline is provided in the pneumatic diaphragm pump.

[0012] By adopting the above technical solution, when the glue liquid does not flow for a long time, the pneumatic agitator stirs the glue liquid in the pressure barrel, and the self-circulating pipeline allows the glue liquid to circulate in the pneumatic diaphragm pump, reducing the possibility of condensation of the glue liquid in the pressure barrel and the pneumatic diaphragm pump.

[0013] Optionally, a coating avoidance assembly is provided on the top surface of the supporting jig, and a plate placement groove is provided on the top surface of the supporting jig. The coating avoidance assembly includes an avoidance cylinder, a connecting rod and a shielding block. The avoidance cylinder is vertically provided on the top surface of the supporting jig, and the connecting rod is transmission-connected to the avoidance cylinder, and one end of the connecting rod extends to the top of the plate placement groove and is connected to the shielding block.

[0014] By adopting the above technical solution, before spraying, the output shaft of the avoidance cylinder is shortened, and the shielding block is driven by the inner connecting rod to contact the position on the circuit board where glue liquid is not needed, thereby shielding the local area of ​​the circuit board, which helps to improve the accuracy of coating.

[0015] Optionally, a lifting plate is provided on the output shaft of the second cylinder, a rotating motor is provided on the lifting plate, a rotating plate is transmission-connected to the rotating motor, and the needle valve is provided on the rotating plate.

[0016] By adopting the above technical solution, for circuit boards with special shapes, the rotating motor adjusts the angle of the needle valve, so that the device can be suitable for glue spraying on circuit boards with different shapes.

[0017] Optionally, a blocking plate is arranged above the workbench, and the blocking plate includes a horizontally arranged lifting part and a blocking part vertically arranged at one end of the lifting part, and the blocking part is arranged between the two upstream conveying bars in the vertical direction. A driving member for driving the blocking plate to move in the vertical direction is arranged on the workbench.

[0018] By adopting the above technical solution, when the supporting jig is moved above the workbench, the driving member drives the blocking plate to move downward, and the blocking portion limits the supporting jig, thereby achieving position limitation of the supporting jig.

[0019] A method for coating glue of a high-precision coating device with a recycling effect, comprising the following steps: S1: Mobile positioning: Place the circuit board on the supporting jig, the upstream conveyor bar transports the supporting jig to the top of the workbench, the lateral movement module moves the spray assembly to the top of the supporting jig, and the inspection camera performs visual inspection and positioning on the circuit board; S2: Preliminary coating: The first cylinder drives the atomizing valve close to the circuit board, the atomizing valve performs preliminary surface coating on the circuit board, and the inspection camera performs visual inspection on the circuit board; S3: Secondary coating: The first cylinder is lifted, the second cylinder is moved down, the needle valve sprays the unqualified position for the second time, and the inspection camera conducts visual inspection again; S4: Automatic unloading: After testing without problems, the spraying component is away from the supporting jig, and the upstream conveyor bar transports the supporting jig out; S5: Glue recovery: Excess glue during the spraying process enters the recovery box through the return stencil, and flows into the pressure barrel through the return pipe for reuse.

[0020] By adopting the above technical solution, the circuit board surface can be fully and evenly coated with glue through two coatings. The recycling component recycles and reuses the excess glue during spraying.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the processing box, spraying components, glue discharging components and recycling components, the glue liquid is recycled, which has the effect of improving the coating quality and utilization rate of the glue liquid; 2. The setting of the coating avoidance component realizes the shielding of local areas of the circuit board, which helps to improve the accuracy of coating; 3. When the glue liquid does not flow for a long time, the pneumatic agitator stirs the glue liquid in the pressure barrel, and the self-circulating pipeline allows the glue liquid to circulate in the pneumatic diaphragm pump, reducing the possibility of condensation of the glue liquid in the pressure barrel and the pneumatic diaphragm pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of the present application for embodying a high-precision coating device with a recycling effect.

[0023] Figure 2 It is a structural schematic diagram used to reflect the recycling component in the embodiment of the present application.

[0024] Figure 3 yes Figure 1 Enlarged view of part A in the middle.

[0025] Figure 4 yes Figure 1 Enlarged view of part B in the middle.

[0026] Figure 5 yes Figure 2 Enlarged view of part C in the middle.

[0027] Explanation of the reference numerals: 1. Processing box; 101. Frame; 102. Workbench; 2. Spraying assembly; 21. Support plate; 22. First cylinder; 23. Atomizing valve; 24. Second cylinder; 25. Lifting plate; 26. Rotating motor; 27. Rotating plate; 28. Needle valve; 29. ​​Detection camera; 3. Recovery assembly; 31. Recovery screen; 32. Recovery box; 33. Negative pressure adsorption machine; 34. Reflux pipe; 4. Glue discharging assembly; 41. Pressure barrel; 42. Pneumatic agitator; 43. Lifting cylinder; 44. Barrel cover; 45. Pneumatic diaphragm pump; 46. Connecting pipe; 47, electronic scale; 48, first rubber delivery hose; 49, second rubber delivery hose; 5, coating avoidance assembly; 51, avoidance cylinder; 52, connecting rod; 53, shielding block; 6, blocking assembly; 61, blocking cylinder; 62, blocking plate; 7, upstream transmission bar; 8, adjustment slide rail; 9, mounting plate; 10, adjustment screw; 11, adjustment block; 12, adjustment motor; 13, supporting jig; 131, plate placement slot; 14, transverse movement module; 141, x-axis moving rail; 142, y-axis moving rail; 143, z-axis moving rail; 15, reflux transmission bar. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 The present application is further described in detail. The present application provides a high-precision coating device with a recycling effect and a glue coating method thereof, which has the effect of improving the coating quality and utilization rate of the glue solution.

[0029] Reference Figure 1-3 A high-precision coating device with a recycling effect includes a processing box 1, a spraying component 2, a recycling component 3, a glue discharging component 4, a coating avoidance component 5 and a blocking component 6. The processing box 1 includes a frame 101 and a workbench 102 horizontally arranged on the frame 101.

[0030] Reference Figure 1 , Figure 4 and Figure 5 Two upstream conveying bars 7 are arranged in parallel on the workbench 102, one of which is fixedly connected to the top surface of the workbench 102, and the other upstream conveying bar 7 is slidably connected to the top surface of the workbench 102. Two adjustment slide rails 8 are arranged in parallel on the top surface of the workbench 102 along the direction perpendicular to the upstream conveying bar 7, and a mounting plate 9 is vertically arranged at both ends of the adjustment slide rail 8, and an adjustment screw 10 is rotatably arranged between the two corresponding mounting plates 9 along the length direction of the adjustment slide rail 8. An adjustment block 11 is slidably arranged on each adjustment slide rail 8, and the adjustment block 11 is threadedly connected to the adjustment screw 10, and the top of the adjustment block 11 is connected to the slidable upstream conveying bar 7. Two adjustment motors 12 are arranged on the workbench 102, and the two adjustment motors 12 correspond to the two adjustment screws 10 one by one and are transmission-connected.

[0031] Reference Figure 3 A supporting jig 13 is provided between the two upstream conveying bars 7, and a driving member for driving the supporting jig 13 to move along the length direction of the upstream conveying bar 7 is provided on the workbench 102. A plate placement groove 131 for placing the circuit board is provided on the top surface of the supporting jig 13. The coating avoidance assembly 5 is provided on the supporting jig 13, and the coating avoidance assembly 5 includes an avoidance cylinder 51, a connecting rod 52 and a shielding block 53. The avoidance cylinder 51 is provided on the top surface of the supporting jig 13, and the output shaft of the avoidance cylinder 51 extends vertically upward and is connected to one end of the connecting rod 52. The other end of the connecting rod 52 extends to the top of the plate placement groove 131, and the shielding block 53 is connected to one end of the connecting rod 52 located above the plate placement groove 131. The shielding block 53 is arranged in the vertical direction corresponding to the position of the plate placement groove 131 that needs to be shielded.

[0032] Reference Figure 1 and Figure 4, a lateral movement module 14 is arranged on the workbench 102, and the lateral movement module 14 includes two parallel x-direction moving rails 141, a y-direction moving rail 142 vertically slidingly arranged between the two x-direction moving rails 141, and a z-direction moving rail 143 vertically sliding on the y-direction moving rail 142. A spraying assembly 2 is arranged on the z-direction moving rail, and the spraying assembly 2 includes a support plate 21, a first cylinder 22, an atomizing valve 23, a second cylinder 24, a lifting plate 25, a rotating motor 26, a rotating plate 27, a needle valve 28 and a detection camera 29. The first cylinder 22 and the second cylinder 24 are arranged on the support plate 21, and the output shafts of the first cylinder 22 and the second cylinder 24 are arranged to extend vertically downward. The output shaft of the first cylinder 22 is transmission-connected to the atomizing valve 23, and the output shaft of the second cylinder 24 is transmission-connected to the lifting plate 25. One side of the lifting plate 25 is connected to the rotating motor 26, the output shaft of the rotating motor 26 is connected to the rotating plate 27, and the needle valve 28 is arranged on the rotating plate 27. The detection camera 29 is arranged on the supporting plate 21, and the detection camera 29 is arranged downward.

[0033] Reference Figure 1 , Figure 2 and Figure 4 The glue discharging assembly 4 includes a pressure barrel 41, a pneumatic agitator 42, a lifting cylinder 43, a barrel cover 44, a pneumatic diaphragm pump 45, a connecting pipe 46, an electronic scale 47, a first rubber delivery pipe 48 and a second rubber delivery pipe 49. The pressure barrel 41 is placed on the electronic scale 47, the barrel cover 44 is arranged at the top opening of the pressure barrel 41, the lifting cylinder 43 is arranged vertically, and the output shaft of the lifting cylinder 43 is connected to the barrel cover 44 in a transmission manner. The pneumatic agitator 42 is arranged on the barrel cover 44, and the output end of the pneumatic agitator 42 is arranged in the pressure barrel 41. The pneumatic diaphragm pump 45 is connected to the pressure barrel 41 through the connecting pipe 46, the first rubber delivery pipe 48 is connected and arranged between the atomizing valve 23 and the pneumatic diaphragm pump 45, and the second rubber delivery pipe 49 is connected and arranged between the needle valve 28 and the pneumatic diaphragm pump 45. A self-circulating pipeline is arranged in the pneumatic diaphragm pump 45.

[0034] Reference Figure 1 and Figure 2 Two reflux conveying bars 15 are arranged in parallel below the workbench 102, and the reflux conveying bars 15 are arranged in parallel with the upstream conveying bars 7. The recovery component 3 is arranged on the workbench 102, and the recovery component 3 includes a recovery mesh plate 31, a recovery box body 32, a negative pressure adsorption machine 33 and a reflux pipe 34. A recovery port is provided on the workbench 102, and the recovery mesh plate 31 is arranged in the recovery port. The recovery box body 32 is connected to the bottom surface of the workbench 102 and is connected to the recovery port. The bottom surface of the recovery box body 32 is inclined, and the lowest position of the bottom end of the recovery box body 32 is connected to one end of the reflux pipe 34, and the other end of the reflux pipe 34 is connected to the pressure barrel 41, and the negative pressure adsorption machine 33 is arranged on the reflux pipe 34.

[0035] Reference Figure 3 The blocking assembly 6 is arranged on the upstream conveying bar 7, and the blocking assembly 6 includes a blocking cylinder 61 and a blocking plate 62. The blocking cylinder 61 is arranged on the upstream conveying bar 7, and the output shaft of the blocking cylinder 61 extends vertically upward. The blocking plate 62 includes a lifting part and a blocking part, the lifting part is drivingly connected to the output shaft of the blocking cylinder 61, and the blocking part is vertically connected to one end of the lifting part. The position of the blocking part is located between the two upstream conveying bars 7 in the vertical direction.

[0036] A method for coating glue of a high-precision coating device with a recycling effect, comprising the following steps: Mobile positioning: Before coating the circuit board, place the circuit board in the board placement slot 131 on the supporting jig 13, shorten the output shaft of the avoidance cylinder 51, and the connecting rod 52 drives the shielding block 53 to descend and shield the parts that do not need to be coated. Driven by the driving member, the supporting jig 13 moves along the length direction of the upstream conveying bar 7 to above the workbench 102. The output shaft of the blocking cylinder 61 is shortened, and the blocking part descends to between the two upstream conveying bars 7 to limit the movement of the supporting jig 13. The transverse module 14 drives the spray assembly 2 to move above the supporting jig 13, and the detection camera 29 detects and positions the circuit board; Initial coating: The support plate 21 is lowered to the circuit board under the action of the Z-direction moving rail, and the output shaft of the first cylinder 22 is extended to drive the atomizing valve 23 to approach the circuit board. The atomizing valve 23 is opened, and the glue in the pressure barrel 41 is sprayed onto the surface of the circuit board through the first glue delivery pipe 48 and the atomizing valve 23. After the initial coating is completed, the detection camera 29 detects the distribution of the glue on the surface of the circuit board; Secondary coating: The first cylinder 22 drives the atomizing valve 23 to move upward and lift, the second cylinder 24 descends, and the needle valve 28 approaches the part where glue is not attached. The needle valve 28 opens, and the glue in the pressure barrel 41 is sprayed to the surface of the circuit board where glue is not fully attached through the second glue delivery pipe 49 and the needle valve 28. For circuit boards with complex shapes, the rotating motor 26 is started to adjust the angle of the needle valve 28 so that it can apply glue to the circuit board from all angles. After the secondary coating is completed, the detection camera 29 detects the glue on the surface of the circuit board.

[0037] Automatic unloading: When the circuit board surface is checked and found to be free of problems, the second cylinder 24 drives the needle valve 28 to lift up, and the driving member transports the supporting jig 13 out of the upstream conveyor bar 7.

[0038] Glue recovery: During the spraying process, excess glue enters the recovery box 32 through the return screen, and under the action of the negative pressure adsorption machine 33, it flows back to the pressure barrel 41 through the return pipe 34 for reuse.

[0039] Reference Figure 2Since the pneumatic diaphragm pump 45 is provided with a self-circulating pipeline, when the equipment stops operating for a long time, the pneumatic diaphragm pump 45 keeps the glue flowing through the self-circulating pipeline, reducing the possibility of the glue staying in one place for a long time and condensing. At the same time, the pneumatic agitator 42 can stir the glue in the pressure barrel 41, further reducing the possibility of the glue solidifying due to long-term non-flow. The setting of the electronic scale 47 facilitates the quantitative coating of the glue. The setting of the recovery component 3 realizes the recovery of the glue, which helps to reduce the waste of the glue.

[0040] The implementation principle of a high-precision coating device with a recycling effect and a gluing method thereof in the embodiment of the present application is as follows: the circuit board is moved onto the workbench 102, and the spraying component 2 applies glue to the surface of the circuit board through preliminary coating and secondary coating. Excess glue flows back to the pressure barrel 41 through the recovery component 3 for recycling and reuse. When the equipment stops operating for a long time, the pneumatic diaphragm pump 45 keeps the glue flowing through the self-circulating pipeline, reducing the possibility of the glue staying in one place for a long time and condensing. At the same time, the pneumatic agitator 42 can stir the glue in the pressure barrel 41, further reducing the possibility of the glue solidifying due to long-term non-flow. The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-precision coating device with recycling effect, characterized in that: The invention comprises a processing box (1), a spraying assembly (2), a glue discharging assembly (4) and a recycling assembly (3); a frame (101) is arranged in the processing box (1); a workbench (102) is arranged on the frame (101); two upstream conveying bars (7) are arranged in parallel on the workbench (102); a supporting jig (13) is slidably arranged between the two upstream conveying bars (7); a spraying assembly (2) of the workbench (102) is arranged above the workbench (102); a lateral movement module (14) for adjusting the position of the spraying assembly (2) is arranged on the workbench (102); the spraying assembly (2) comprises a support plate (21) and an atomizing valve (23); the support plate (21) is arranged on the lateral movement module (14); the atomizing valve (23) is arranged on the support plate (21); the glue discharging assembly (4) comprises a support plate (21) and a support plate (21); The component (4) comprises a pressure barrel (41), a pneumatic diaphragm pump (45) and a first rubber delivery pipe (48). The pneumatic diaphragm pump (45) is connected to the pressure barrel (41). The two ends of the first rubber delivery pipe (48) are respectively connected to the atomizing valve (23) and the pneumatic diaphragm pump (45). The recovery component (3) comprises a return screen, a recovery box (32), a negative pressure adsorption machine (33) and a return pipe (34). A recovery port is provided on the workbench (102). The return screen is arranged in the recovery port. The recovery box (32) is connected to the bottom surface of the workbench (102) and is connected to the recovery port. The two ends of the return pipe (34) are respectively connected to the recovery box (32) and the pressure barrel (41). The negative pressure adsorption machine (33) is arranged on the return pipe (34).

2. The high-precision coating device with recycling effect according to claim 1, characterized in that: The spray assembly (2) also includes a first air cylinder (22), a second air cylinder (24), a needle valve (28) and a detection camera (29). The first air cylinder (22) and the second air cylinder (24) are both arranged on the support plate (21). The output shafts of the first air cylinder (22) and the second air cylinder (24) are both arranged in the vertical direction. The first air cylinder (22) is transmission-connected to the atomizing valve (23). The second air cylinder (24) is transmission-connected to the needle valve (28). The needle valve (28) is connected to the pneumatic diaphragm pump (45) and is provided with a second rubber delivery hose (49). The detection camera (29) is arranged on the support plate (21), and the detection camera (29) is arranged downward.

3. The high-precision coating device with recycling effect according to claim 2, characterized in that: One of the upstream conveying bars (7) is slidably connected to the workbench (102), and an adjusting slide rail (8) is provided on the workbench (102) along a direction perpendicular to the upstream conveying bar (7). One of the upstream conveying bars (7) is slidably connected to the adjusting slide rail (8), and a driving member for driving the upstream conveying bar (7) to move is provided on the workbench (102).

4. The high-precision coating device with recycling effect according to claim 3, characterized in that: The pressure barrel (41) is provided with a pneumatic stirrer (42), an electronic scale (47) is provided below the pressure barrel (41), the pressure barrel (41) is placed on the electronic scale (47), and a self-circulating pipeline is provided in the pneumatic diaphragm pump (45).

5. The high-precision coating device with recycling effect according to claim 4, characterized in that: The top surface of the supporting jig (13) is provided with a coating avoidance assembly (5), and the top surface of the supporting jig (13) is provided with a placement plate groove (131). The coating avoidance assembly (5) comprises an avoidance cylinder (51), a connecting rod (52) and a shielding block (53). The avoidance cylinder (51) is vertically arranged on the top surface of the supporting jig (13), and the connecting rod (52) is transmission-connected to the avoidance cylinder (51). One end of the connecting rod (52) extends to the top of the placement plate groove (131) and is connected to the shielding block (53).

6. The high-precision coating device with recycling effect according to claim 5, characterized in that: A lifting plate (25) is arranged on the output shaft of the second cylinder (24), a rotating motor (26) is arranged on the lifting plate (25), a rotating plate (27) is transmission-connected to the rotating motor (26), and the needle valve (28) is arranged on the rotating plate (27).

7. The high-precision coating device with recycling effect according to claim 6, characterized in that: A blocking plate (62) is arranged above the workbench (102), and the blocking plate (62) includes a horizontally arranged lifting part and a blocking part vertically arranged at one end of the lifting part, and the blocking part is arranged between the two upstream conveying bars (7) in the vertical direction. A driving member for driving the blocking plate (62) to move in the vertical direction is arranged on the workbench (102).

8. A method for coating glue using a high-precision coating device with a recycling effect according to any one of claims 2 to 7, characterized in that: The following steps are involved: S1: Moving and positioning: placing the circuit board on the supporting jig (13), the upstream conveyor bar (7) transports the supporting jig (13) to the top of the workbench (102), the lateral movement module (14) moves the spraying assembly (2) to the top of the supporting jig (13), and the inspection camera (29) performs visual inspection and positioning on the circuit board; S2: Preliminary coating: The first cylinder (22) drives the atomizing valve (23) close to the circuit board, the atomizing valve (23) performs preliminary surface coating on the circuit board, and the inspection camera (29) performs visual inspection on the circuit board; S3: Secondary coating: The first cylinder (22) is lifted, the second cylinder (24) is moved downward, the needle valve (28) performs secondary spraying on the unqualified position, and the inspection camera (29) performs visual inspection again; S4: Automatic unloading: After being tested and found to be faulty, the spraying assembly (2) is moved away from the supporting jig (13), and the upstream conveyor bar (7) transports the supporting jig (13) out; S5: Glue recovery: Excess glue during the spraying process enters the recovery box (32) through the return screen, and flows into the pressure barrel (41) through the return pipe (34) for reuse.

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