Part surface paint spraying method

Abstract

The invention relates to a part surface paint spraying method, belongs to the technical field of spraying, and solves the problems that in the prior art, part surface coatings are poor in adhesive force due to uneven paint mixing, and use of parts is affected. The method comprises the following steps that 1, three-dimensional scanning measurement software scans the shape of a part and transmits the shape to a control unit, and the control unit edits the coating thickness and the spraying path; 2, powder in the powder tank and liquid in the liquid cylinder are injected into the material tank according to a certain proportion and evenly stirred; 3, the control unit indicates the motion unit to position the spray head unit according to the edited path; 4, the mixed materials are conveyed to a spray head unit through a material conveying pipe, and a spray head is selected for spraying; and 5, after spraying is completed, the material tank and the spray head are cleaned. The part coating can be uniformly mixed, and the surface spraying effect is consistent.

Description

Technical Field

[0001] The invention relates to the technical field of spraying, and in particular to a method for spraying paint on a part surface. Background Art

[0002] In the prior art, when spraying paint on the surface of a part, due to uneven mixing of the paint, agglomeration and uneven adhesion of the coating on the surface of the part are likely to occur, resulting in poor adhesion of the coating and affecting the use of the part. Summary of the invention

[0003] In view of the above analysis, an embodiment of the present invention aims to provide a method for spraying paint on a part surface, so as to solve the problem in the prior art that uneven mixing of paint leads to poor adhesion of the coating on the part surface, thus affecting the use of the part.

[0004] The purpose of the present invention is mainly achieved through the following technical solutions:

[0005] A method for spraying paint on a part surface comprises the following steps:

[0006] Step 1: The 3D scanning measurement software scans the shape of the part and transmits it to the control unit, which edits the coating thickness and spray path;

[0007] Step 2: Pour the powder in the powder tank and the liquid in the liquid tank into the material tank in a certain proportion and stir evenly;

[0008] Step 3: The control unit instructs the motion unit to position the nozzle unit according to the edited path;

[0009] Step 4: The feeding unit transports the mixed material to the nozzle unit, and the nozzle is selected to spray the parts;

[0010] Step 5: Clean the tank and nozzle after spraying.

[0011] Furthermore, the step 2 specifically includes:

[0012] Step 2.1: Pour the powder in the powder tank and the liquid in the liquid tank into the material tank in a certain proportion;

[0013] Step 2.2: Use a stirring unit to stir the material in the tank.

[0014] Furthermore, the stirring unit in step 2.2 includes a first stirring component; the first stirring component is arranged at the lower part of the material tank; the first stirring component includes a second motor, a screw and a stirring blade.

[0015] Furthermore, the stirring blade is arranged in the middle of the material tank; the stirring blade is a vortex stirring blade; when the second motor is started, the vortex stirring blade stirs the material in the middle of the material tank.

[0016] Furthermore, the control unit transmits a motor command to the X-axis, and the slider of the X-axis drives the Y-axis to move along the crossbeam of the X-axis to the desired X-direction position;

[0017] The control unit sends a command to the motor of the Y-axis, and the slider of the Y-axis drives the nozzle unit to move along the crossbeam of the Y-axis to the required Y-axis position;

[0018] The control unit sends a command to the Z-axis motor, and the Z-axis slider drives the Z-axis to move up and down to the required Z-axis position.

[0019] Furthermore, the nozzle in step 4 includes a first nozzle and a second nozzle.

[0020] Further, a first spray head is arranged at the lower part of the rotating seat, and the first spray head is used for ordinary spraying;

[0021] The second nozzle is arranged on one side of the rotating seat and is a slender nozzle. The second nozzle is used for spraying in a narrow position;

[0022] Furthermore, the first nozzle or the second nozzle is selected by rotating the rotating seat.

[0023] Furthermore, the step 5 comprises:

[0024] Step 5.1: Open the liquid inlet pipe and inject cleaning liquid into the material tank to clean the material tank;

[0025] Step 5.2: Inject the cleaning fluid into the nozzle; use the nozzle cleaning assembly to clean the nozzle.

[0026] Furthermore, the specific method of cleaning the material tank in step 5.1 is:

[0027] Open the valve of the liquid inlet pipe, close the valve of the liquid outlet pipe, and inject the cleaning liquid into the material tank;

[0028] The cleaning liquid is stirred by the stirring unit to complete the cleaning of the material tank;

[0029] Open the liquid outlet pipe of the material tank and discharge the cleaning liquid after cleaning the inside of the material tank.

[0030] Furthermore, the step 2.2 specifically includes:

[0031] Step 2.2.1: The stirring blades and the first rotating frame in the first stirring assembly rotate and rise and fall to stir the materials in the middle and near the wall;

[0032] Step 2.2.2: The second rotating frame in the second stirring assembly rotates to stir the material near the wall; the saw teeth peel off the attachments on the wall.

[0033] Furthermore, in step 2.2.1, the specific method is:

[0034] The second motor is started, and the second motor drives the screw to rotate, so that the stirring blade and the first rotating frame fixed on the screw rotate and reciprocate and rise and fall;

[0035] The vortex stirring blades lift and push the mixture upward from the bottom, while mixing it in a circular direction to achieve multi-dimensional stirring.

[0036] Furthermore, in step 2.2.2, the specific method is:

[0037] The third motor is started, and the third motor drives the rotating shaft to drive the second rotating frame to rotate;

[0038] The first rotating frame and the second rotating frame rotate in opposite directions;

[0039] The first stirring rod of the first rotating frame and the second stirring rod of the second rotating frame are arranged opposite to each other and cooperate with each other to stir the materials near the wall of the material tank.

[0040] Furthermore, the cleaning of the nozzle is completed in step 5, specifically in the following manner:

[0041] Step 5.2.1: Open the feed port and inject the cleaning liquid into the nozzle;

[0042] Step 5.2.2: Start the first motor to unfold the first telescopic part and the second telescopic part;

[0043] Step 5.2.3: Fill gas through the gas filling port in the first telescopic part, and continuously inject cleaning liquid through the liquid filling port; the air flow and liquid flow flush the spray hole to complete the cleaning of the nozzle.

[0044] Furthermore, in the step 5.2.2, a brush is provided on the outside of the second telescopic part. When the second telescopic part is extended and rotated, the brush on the outside of the second telescopic part removes the paint on the inner wall of the nozzle by screwing it down.

[0045] Furthermore, in step 5.2.3, the second telescopic portion is provided with a venturi tube, and the airflow and liquid flow flow through the venturi tube to form faster airflow and liquid flow.

[0046] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0047] (1) The present invention scans the shape of the part through three-dimensional scanning measurement software, transmits it to the control mechanism, and edits the coating thickness and spraying path; stirs the mixed material in the material tank through the stirring unit, and positions the nozzle unit through the motion unit to realize the painting operation of the nozzle.

[0048] (2) The first stirring assembly of the present invention is provided with a central stirring portion of a vortex stirring blade. The special shape of the vortex stirring blade has the function of lifting and rotating when stirring the material. Combined with the lifting and lowering of the vortex stirring blade, the vortex stirring blade forms a multi-dimensional stirring on the center of the material tank and fully mixes the material;

[0049] (3) In the present invention, the first nozzle is arranged at the lower part of the rotating seat, and the second nozzle is arranged at one side of the rotating seat. The first nozzle and the second nozzle are operated by rotating the rotating seat to select a suitable nozzle.

[0050] (4) Compared with the prior art, the present invention is based on a stirring unit of multiple stirring components to fully stir the center and edge of the material inside the barrel, thereby improving the material mixing effect, making the material mixed evenly, and spraying the surface of the parts uniformly; the first rotating frame and the second rotating frame rotate in opposite directions, and the first stirring rod and the second stirring rod arranged thereon rotate in opposite directions, so that the vortices formed by the stirring between the first stirring rod and the second stirring rod collide with each other and mix synergistically, thereby improving the stirring effect of the mixture at the wall surface, and making the materials mix together faster and more evenly; a stripping part is arranged on the outside of the second rotating frame, and the stripping part in the present invention is a sawtooth, which peels off the attachments on the wall surface by rotation. The sawtooth has different inclination angles on both sides, and the attachments are scraped off on one side and flow out from the other side, thereby reducing the residue on the wall surface.

[0051] (5) Compared with the prior art, the present invention sets the nozzle cleaning component as a telescopic structure. During the spraying operation, the fixed part is retracted to prevent interference with the spraying operation; after the spraying operation, the fixed part is extended to clean the nozzle. While the second telescopic part is retracted, the circumferential spiral brush rotates out the attachments at the spray hole. During cleaning, compressed gas is filled into the first telescopic part to promote the liquid flow, increase the flow rate to flush the spray hole, and combined with the Venturi tube set in the second telescopic part, the flow rate of the cleaning liquid is further increased to flush the spray hole, so that the nozzle is cleaned more thoroughly.

[0052] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0054] Figure 1 Schematic diagram of the painting method of the embodiment;

[0055] Figure 2It is a structural schematic diagram of a paint spraying device;

[0056] Figure 3 is a schematic diagram of the structure of the stirring unit;

[0057] Figure 4 is a schematic structural diagram of a stripping portion of a stirring unit;

[0058] Figure 5 It is a structural schematic diagram of the nozzle unit;

[0059] Figure 6 It is a schematic diagram of the structure of the nozzle cleaning component.

[0060] Reference numerals:

[0061] 1-3D scanning measurement software, 2-motion unit, 21-X axis, 22-Z axis, 23-Y axis, 3-nozzle unit, 31-positioning probe, 32-nozzle, 321-first nozzle, 322-second nozzle, 33-rotating seat, 331-feeding port, 34-fixed seat, 35-nozzle cleaning assembly, 351-first motor, 352-first rotating shaft, 353-fixed part, 354-first telescopic part, 3541-liquid injection port, 3542-liquid outlet, 3543-inflating port, 355-second telescopic part , 3551-Venturi tube part, 3552-conical part, 3553-brush, 4-feeding unit, 41-powder tank, 42-liquid tank, 43-material tank, 5-stirring unit, 51-first stirring component, 511-second motor, 512-screw, 513-central stirring part, 514-first rotating frame, 515-first stirring rod, 52-second stirring component, 521-third motor, 522-rotating shaft, 523-second rotating frame, 524-second stirring rod, 525-peeling part, 6-control unit. DETAILED DESCRIPTION

[0062] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0063] This embodiment provides a method for spraying paint on a part surface. Figure 1 As shown, based on Figure 2 The painting device shown comprises the following steps:

[0064] Step 1: The three-dimensional scanning measurement software 1 scans the shape of the part and transmits it to the control unit 6, which edits the coating thickness and spraying path;

[0065] Step 2: Pour the powder in the powder tank 41 and the liquid in the liquid cylinder into the material tank 43 in a certain proportion and stir them evenly;

[0066] Step 3: The control unit 6 instructs the motion unit 2 to position the nozzle unit 33 according to the edited path;

[0067] Step 4: The feeding unit 4 delivers the mixed material to the nozzle unit 33, and the nozzle 32 is selected for spraying;

[0068] Step 5: Clean the tank and nozzle after spraying.

[0069] The step 1 includes:

[0070] The parts are scanned and measured in real time in three dimensions by the three-dimensional scanning measurement software 1, and the spraying program is automatically programmed, the movement path of the nozzle 32, the feed speed, flow rate, spraying area and spraying thickness of the paint are compiled, the spraying operation is visualized, and the spraying accuracy and production efficiency are improved.

[0071] The step 2 includes:

[0072] Step 2.1: Powder in the powder tank 41 and liquid in the liquid tank 42 are injected into the material tank 43 in a certain proportion;

[0073] The specific method is:

[0074] Open the valve at the bottom of the powder tank 41, and inject the amount of powder obtained in step 1 into the material tank 43, and close the valve after the required amount is reached;

[0075] Open the valve at the bottom of the liquid tank 42, and inject the amount of liquid obtained in step 1 into the material tank 43, and close the valve after the required amount is reached.

[0076] Step 2.2: Use the stirring unit 5 to stir the material in the material tank 43.

[0077] The step 2.2 includes:

[0078] Step 2.2.1: The stirring blade 513 and the first rotating frame 514 in the first stirring component 51 rotate and rise and fall to stir the materials in the middle and near the wall;

[0079] The specific implementation is:

[0080] like Figure 3 As shown, the second motor 511 is started, and the second motor 511 drives the screw 512 to rotate, so that the stirring blade 513 and the first rotating frame 514 fixed on the screw 512 rotate and reciprocate and rise and fall.

[0081] The stirring blade 513 is arranged at the center of the material tank 43, and is used to stir the mixture at the center of the material tank 43. Preferably, the stirring blade 513 in this embodiment is a vortex stirring blade 513. The vortex stirring blade 513 has a special spiral shape. When stirring, the vortex stirring blade 513 lifts and pushes the mixture from the bottom to the top, and mixes it in the circumferential direction at the same time, so as to achieve multi-dimensional stirring and improve stirring efficiency. Since the stirring blade 513 reciprocates and rises and falls when rotating, during the lifting and lowering movement, the stirring blade 513 fully mixes the upper and lower layers of materials at different depths in the material tank 43, prevents the mixture from being stratified, and achieves a better mixing effect.

[0082] In this embodiment, the first rotating frame 514 is a frame structure, and a plurality of parallel first stirring rods 515 are longitudinally arranged on the outer side of the frame. The axis direction of the first stirring rod 515 is perpendicular to the axis direction of the screw rod 512 .

[0083] When the first rotating frame 514 rotates and rises and falls, since the first stirring rods 515 are arranged in multiple layers, the first stirring rods 515 stir the surrounding materials and the materials in the upper and lower layers to mix them, thereby preventing the materials at the edge from being delaminated.

[0084] Step 2.2.2: The second rotating frame 523 in the second stirring component 52 rotates to stir the material near the wall surface; the saw teeth peel off the attachments on the wall surface.

[0085] The third motor 521 is started, and the third motor 521 drives the rotating shaft 522 to drive the second rotating frame 523 to rotate.

[0086] The second rotating frame 523 is disposed near the wall surface. Preferably, the second rotating frame 523 in this embodiment is a frame structure. A plurality of parallel second stirring rods 524 are longitudinally disposed inside the second rotating frame 523 , and the second stirring rods 524 are disposed opposite to the first stirring rods 515 .

[0087] There is a gap between the inner diameter formed by the end of the second stirring rod 524 and the outer diameter formed by the end of the first stirring rod 515 to prevent the first stirring rod 515 and the second stirring rod 524 from colliding during rotation.

[0088] It should be noted that the rotation directions of the first rotating frame 514 and the second rotating frame 523 are opposite.

[0089] The first stirring rod 515 of the first rotating frame 514 and the second stirring rod 524 of the second rotating frame 523 are arranged opposite to each other and cooperate with each other to stir the materials near the wall of the material tank 43 .

[0090] In this embodiment, the stirring directions of the first stirring rod 515 and the second stirring rod 524 are opposite. The first stirring rod 515 and the second stirring rod 524 form their own flow fields when stirring, and stir the mixture near the first stirring rod 515 and the second stirring rod 524. The first stirring rod 515 stirs while rotating and lifting, and the second stirring rod 524 stirs while rotating. Under the action of the relative stirring rods, the materials in the area are stirred from different directions, and the formed eddies and flow fields collide and mix with each other. This coordinated stirring makes the materials near the wall of the material tank 43 mix faster and more evenly, ensuring that the performance of the mixed coating is uniform; the center of the materials inside the material tank 43 and the vicinity of the wall are mixed and stirred, leaving no mixing dead corners, and achieving a good mixing effect.

[0091] Furthermore, the outer side of the second rotating frame 523 has a peeling portion 525. Preferably, the peeling portion 525 in this embodiment is a sawtooth. Figure 4 As shown, the inclination angles on both sides of the saw teeth are different, so that after the attached matter is scraped off on one side, it can flow out from the other side into the mixture, reducing residue, uneven mixing and agglomeration.

[0092] Compared with the prior art, the stirring unit 5 based on multiple stirring components in this embodiment fully stirs the materials inside the barrel, improves the material mixing effect, makes the materials evenly stirred, sprays the parts surface uniformly, and improves the spraying quality. The first stirring component 51 is provided with a central stirring portion of a vortex stirring blade 513. The special shape of the vortex stirring blade 513 has the function of lifting and rotating when stirring the materials. Combined with the lifting and lowering of the vortex stirring blade 513, the vortex stirring blade 513 forms a multi-dimensional stirring on the center of the material tank 43, and fully mixes. The first rotating frame 514 and the second rotating frame 523 rotate in opposite directions, and the first stirring rod 515 and the second stirring rod 524 arranged thereon rotate in opposite directions, so that the vortexes formed by the stirring between the first stirring rod 515 and the second stirring rod 524 collide with each other and mix synergistically, thereby improving the stirring effect of the mixture at the wall surface, and making the materials mix together faster and more evenly. A stripping portion 525 is provided on the outside of the second rotating frame 523. The stripping portion 525 in this embodiment is a sawtooth, and the sawtooth strips the attachments on the wall surface by rotation. The saw teeth have different inclination angles on both sides, so that the attached matter is scraped off on one side and flows out from the other side, reducing the residue on the wall.

[0093] In the step 3, positioning the nozzle unit 33 by the control unit 6 specifically includes:

[0094] The control unit 6 moves the spray head 32 to a desired position according to the movement path of the spray head unit 33 obtained in step 1.

[0095] The X-axis 21 is used to adjust the position of the nozzle unit 33 in the X-axis 21 direction. The control unit 6 sends a motor command to the X-axis 21, and the slider of the X-axis 21 drives the Y-axis 23 to move along the crossbeam of the X-axis 21 to the required X-direction position.

[0096] The Y-axis 23 is used to adjust the position of the nozzle unit 33 in the Y-axis 23 direction. The control unit 6 sends a motor command to the Y-axis 23, and the slider of the Y-axis 23 drives the nozzle unit 33 to move along the crossbeam of the Y-axis 23 to the desired Y-direction position.

[0097] The Z-axis 22 is used to adjust the Z-direction position of the nozzle unit 33. The control unit 6 transmits a motor command to the Z-axis 22, and the slider of the Z-axis 22 drives the Z-axis 22 to move up and down to the desired Z-direction position.

[0098] The positioning in the directions of the X-axis 21 , the Y-axis 23 and the Z-axis 22 is completed. The positioning probe 31 positions the nozzle 32 and feeds back to the control unit 6 .

[0099] Step 4: the feeding unit 4 delivers the mixed material to the nozzle unit 3, and the nozzle 32 is selected for spraying;

[0100] A material delivery pipe is connected between the nozzle unit 3 and the material tank 43. The material delivery pipe delivers the material in the material tank 43 to the nozzle 32 of the nozzle unit 33. An air compressor is arranged at the lower part of the material tank 43, and pressure feeding is performed by the air compressor during feeding.

[0101] like Figure 5 As shown, two nozzles 32 are provided, including a first nozzle 321 and a second nozzle 322. The first nozzle 321 is provided at the lower part of the rotating seat 33 for ordinary spraying; the second nozzle 322 is provided at one side of the rotating seat 33 and is a slender nozzle 32 for spraying in a narrow position. The nozzle 32 can rotate with the rotating seat 33. When the ordinary spraying function is required, the first nozzle 321 is used; when the narrow position of the casting needs to be sprayed, the second nozzle 322 is used.

[0102] In step 5, after spraying is completed, the material tank 43 and the spray head 32 are cleaned, which specifically includes:

[0103] Step 5.1: Open the liquid inlet pipe and inject cleaning liquid into the material tank 43 to clean the material tank 43;

[0104] The material tank 43 is provided with a liquid inlet pipe at the top and a liquid outlet pipe at the bottom. Open the valve of the liquid inlet pipe, close the valve of the liquid outlet pipe, and inject the cleaning liquid into the material tank 43. Close the feed pipe. Start the second motor 511 and the third motor 521, and stir the cleaning liquid in the material tank 43 through the first stirring component 51 and the second stirring component 52 of the stirring unit 5 to flush the material on the wall, and use the outer stripping part 525 of the first stirring component 51 to remove the attached matter. After the cleaning of the material tank 43 is completed, open the liquid outlet pipe of the material tank 43 to discharge the cleaning liquid after cleaning the inside of the material tank 43.

[0105] In this embodiment, the first stirring component 51 and the second stirring component 52 of the stirring unit 5 are used to clean the material tank 43, flush and remove the wall attachments, so as to improve the wall cleaning effect.

[0106] Step 5.2: Inject cleaning liquid into the nozzle 32; use the nozzle cleaning component 35 to clean the nozzle 32.

[0107] Step 5.2.1: Open the feed port 331 and inject the cleaning liquid into the nozzle 32;

[0108] Step 5.2.2: Start the first motor 351 to unfold the first telescopic part 354 and the second telescopic part 355;

[0109] like Figure 6 As shown, the first motor 351 is started, and the first motor 351 drives the first rotating shaft 352 to rotate, and the first telescopic part 354 and the second telescopic part 355 rotate and extend from the fixed part 353 in sequence. After extending, the first telescopic part 354 is located inside the rotating seat 33, the second telescopic part 355 is located inside the nozzle 32, and the fixed part 353 is located inside the fixed seat 34.

[0110] Further, the second telescopic part 355 includes a venturi tube 3551 and a tapered part 3552. A brush 3553 is disposed outside the venturi tube 3551 and the tapered part 3552. When the second telescopic part 355 is extended and rotated, the brush 3553 outside the second telescopic part 355 removes the paint on the inner wall of the nozzle 32 by rotating it down.

[0111] Step 5.2.3: Fill gas through the gas filling port 3542 in the first telescopic portion 354 , and continuously inject cleaning liquid through the liquid filling port 3541 ; the air flow and liquid flow flush the spray hole to complete the cleaning of the nozzle 32 .

[0112] The wall surface of the first telescopic portion 354 is provided with an air filling port 3542, and compressed air is filled into the air filling port 3542. The compressed air accelerates the flow rate of the cleaning liquid, forms a vortex, flows into the second telescopic portion 355, and flushes the spray hole.

[0113] Furthermore, the second telescopic portion 355 is provided with a venturi tube 3551, and the airflow and liquid flow pass through the venturi tube 3551, and the effect of the venturi tube 3551 is utilized to further accelerate the flow rate of the airflow and liquid flow, so as to form a greater force to flush the attachments on the spray hole.

[0114] After the nozzle 32 is cleaned, the cleaning liquid is discharged from the liquid outlet 3542 on the wall of the first telescopic portion 354 and the liquid outlet 332 of the rotating seat.

[0115] Compared with the prior art, the nozzle cleaning assembly 35 of this embodiment is set as a telescopic structure. During the spraying operation, the fixed part 353 is retracted to prevent interference with the spraying operation; after the spraying operation, the fixed part 353 is extended to clean the nozzle 32. While the second telescopic part 355 is retracted, the circumferential spiral brush 3553 is rotated to remove the attachments at the spray hole. During cleaning, compressed gas is filled into the first telescopic part 354 to promote the liquid flow, increase the flow rate to flush the spray hole, and combine with the venturi tube 3551 set in the second telescopic part 355 to further increase the flow rate of the cleaning liquid, flush the spray hole, and make the nozzle 32 clean more thoroughly.

[0116] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for spraying paint on a part surface, characterized in that: The following steps are involved: Step 1: The three-dimensional scanning measurement software (1) scans the shape of the part and transmits it to the control unit (6), and the control unit (6) edits the coating thickness and spraying path; Step 2: Pour the powder in the powder tank (41) and the liquid in the liquid tank (42) into the material tank (43) in a certain proportion and stir them evenly; Step 3: The control unit (6) instructs the motion unit (2) to position the nozzle unit (3) according to the edited path; Step 4: The material feeding unit (4) delivers the mixed material to the spray head unit (3), and the spray head (32) is selected to spray the parts; Step 5: After spraying is completed, the material tank (43) and the spray head (32) are cleaned.

2. The method for spraying paint on a part surface according to claim 1, characterized in that: The step 2 specifically includes: Step 2.1: Powder in the powder tank (41) and liquid in the liquid tank (42) are injected into the material tank (43) in a certain proportion; Step 2.2: Use the stirring unit (5) to stir the material in the material tank (43).

3. The method for spraying paint on a part surface according to claim 2, characterized in that: The stirring unit (5) in step 2.2 includes a first stirring component (51); the first stirring component (51) is arranged at the lower part of the material tank (43); the first stirring component (51) includes a second motor (511), a screw (512) and a stirring blade (513).

4. The method for spraying paint on a part surface according to claim 3, characterized in that: The stirring blade (513) is arranged in the middle of the material tank (43); the stirring blade (513) is a vortex stirring blade; when the second motor (511) is started, the vortex stirring blade stirs the material in the middle of the material tank (43).

5. The method for spraying paint on a part surface according to claim 1, characterized in that: The step 3 is specifically as follows: The control unit (6) transmits a motor command to the X-axis (21), and the slider of the X-axis (21) drives the Y-axis (23) to move along the crossbeam of the X-axis (21) to a desired X-direction position; The control unit (6) transmits a motor command to the Y-axis (23), and the slider of the Y-axis (23) drives the nozzle unit (3) to move along the crossbeam of the Y-axis (23) to a desired Y-direction position; The control unit (6) transmits a motor command to the Z-axis (22), and the slider of the Z-axis (22) drives the Z-axis (22) to move up and down to a desired Z-direction position.

6. The method for spraying paint on a part surface according to claim 1, characterized in that: The nozzle (32) in step 4 includes a first nozzle (321) and a second nozzle (322).

7. The method for spraying paint on a part surface according to claim 6, characterized in that: The first spray head (321) is arranged at the lower part of the rotating seat (33), and the first spray head (321) is used for ordinary spraying; The second spray head (322) is arranged on one side of the rotating seat (33) and is a slender spray head (32). The second spray head (322) is used for spraying in a narrow position.

8. The method for spraying paint on a part surface according to claim 7, characterized in that: The first nozzle (321) or the second nozzle (322) is selected by rotating the rotating seat (33).

9. The method for spraying paint on a part surface according to claim 1, characterized in that: The step 5 comprises: Step 5.1: Open the liquid inlet pipe and inject cleaning liquid into the material tank (43) to clean the material tank (43); Step 5.2: Inject cleaning liquid into the nozzle (32); use the nozzle cleaning assembly (35) to clean the nozzle (32).

10. The method for spraying paint on a part surface according to claim 9, characterized in that: The specific method of cleaning the material tank (43) in step 5.1 is: Open the valve of the liquid inlet pipe, close the valve of the liquid outlet pipe, and inject the cleaning liquid into the material tank (43); The cleaning liquid is stirred by the stirring unit (5) to complete the cleaning of the material tank (43); The liquid outlet pipe of the material tank (43) is opened to discharge the cleaning liquid after cleaning the inside of the material tank (43).

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