Surface plastic spraying assembly line for automatic stamping parts

Abstract

The invention relates to the technical field of plastic spraying equipment, in particular to an automatic stamping part surface plastic spraying assembly line which comprises a gun body and a spray head, a gas transmission main channel, a gas transmission branch channel and a coating channel are arranged in the gun body, and the spray head is in threaded connection to the front end of the gun body and provided with a paint spraying opening and a plurality of gas spraying openings. The air nozzle is communicated with the air transmission main channel through the air transmission branch channel; according to the device, the shearing wheel and the stirring wheel which rotate oppositely are arranged, the shearing gap is formed between the shearing wheel and the stirring wheel, particles, larger than the shearing gap in size, in a coating can stay in the shearing gap, and the stirring wheel and the shearing wheel can generate a shearing effect on the particles staying in the shearing gap; after the shearing action of the shearing wheel and the stirring wheel, the size of the sheared particles is smaller than the diameter of the paint spraying opening, and the sheared particles can be discharged from the paint spraying opening; and particles in the coating are prevented from blocking the paint spraying opening, and the discharging uniformity during spraying is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic spraying equipment, in particular to an automatic surface plastic spraying assembly line for stamping parts. BACKGROUND

[0002] The paint spraying gun of the automatic surface plastic spraying assembly line for stamping parts mainly generates compressed air with a certain pressure and flow rate through an air compressor. The compressed air is transmitted to the nozzle of the spray gun through the air channel of the paint spraying gun. When the compressed air is sprayed out of the nozzle at high speed, a low-pressure area is formed at the front end of the nozzle. According to Bernoulli's principle, paint is sucked out of the paint tank or the feeding system of the paint spraying gun under the action of atmospheric pressure and enters the high-speed compressed air flow. The compressed air disperses the paint into fine particles, forming an atomized state. The atomized paint particles are sprayed onto the surface of the stamping part at a certain speed and angle under the action of the compressed air flow. As the paint spraying gun moves, the paint evenly covers the surface of the stamping part, forming a thin coating. However, there are particles in the paint that are not uniformly stirred or have already formed a certain degree of hardness. Even if they are stirred, they cannot be dissolved. For particles larger than the diameter of the paint spraying port, the paint spraying gun will be blocked, resulting in uneven spraying, reduced efficiency, damaged spray gun, and reduced coating quality.

[0003] To solve the above problems, the prior art provides the following solutions. For example, the utility model patent with the application number CN202420335681.6 provides a novel pigment spraying machine. The invention is provided with stirring blades and through holes, so that after the pigment is added to the storage cylinder, the motor drives the stirring rod to rotate, and the stirring blades rotate in the interior of the storage cylinder. The stirring blades contact with the pigment to stir it evenly. A small amount of pigment passes through the through holes on the surface of the stirring blades during the contact process, thereby reducing the resistance of the stirring blades during rotation and reducing the load of the motor when driving the stirring rod to rotate. The filter pipe and the connecting pipe are provided, so that the connecting pipe is installed at the lower end of the filling pipe, the filter pipe is located at the lower end of the cylinder cover, and the upper end of the filter pipe is assembled on the lower end surface of the cylinder cover by means of bolts. When the pigment is added from the filling pipe, it will first enter the filter pipe. The filter pipe can filter the added pigment once, reducing the impurities mixed in the pigment. Since the filter pipe is in the shape of a ring, the volume of the filter pipe during filtration of the pigment can be increased, and the pigment is not easy to overflow from the filling pipe when filling too fast. After the impurities in the pigment are reduced, the risk of clogging the nozzle in the spray gun is reduced. However, in this technical solution, the filter pipe still has the problem of insufficient filtration, and there is no filter screen cleaning function. As the use time is prolonged, the filter screen will be clogged, thereby reducing the spraying efficiency. SUMMARY

[0004] The purpose of this invention is to provide an automated powder coating production line for stamped parts, in order to solve the problems mentioned in the background art, such as the presence of particles in the coating that are not evenly stirred, or particles that have already formed to a certain degree of hardness that cannot be dissolved even when stirred, which will cause blockage of the spray gun, resulting in uneven spraying, reduced efficiency, damage to the spray gun, and reduced coating quality.

[0005] At the same time, address the shortcomings of existing solutions.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automated powder coating production line for stamped parts includes a gun body and a nozzle. The gun body has a main air supply channel, a branch air supply channel, and a paint supply channel. The nozzle is threaded to the front end of the gun body and has a paint spray nozzle and multiple air jet nozzles. The paint spray nozzle is connected to the paint supply channel, and the air jet nozzles are connected to the main air supply channel through the branch air supply channels.

[0008] Specifically, the gun body has a shearing chamber, and the paint channel is coaxially arranged with the shearing chamber and completely passes through both ends of the shearing chamber. The shearing chamber has a shearing wheel and multiple stirring wheels, with the front ends of the multiple stirring wheels flush. The shearing wheel is located at the front end of the multiple stirring wheels, and a shearing gap is provided between the shearing wheel and the stirring wheels. The width of the shearing gap is A, and the diameter of the paint nozzle is B, where A≦B. The gun body has a drive assembly, which is used to drive the shearing wheel and stirring wheels to rotate. The drive assembly is designed such that when there is compressed gas flowing in the main gas supply channel, the compressed gas drives the shearing wheel and stirring wheels to rotate in opposite directions through the drive assembly.

[0009] By configuring a shearing wheel and an agitator wheel, and setting a shear gap between them, when compressed gas flows in the main gas delivery channel, the airflow drives the shearing wheel and the agitator wheel to rotate in opposite directions via the drive assembly. When the paint in the paint channel reaches the shear gap between the agitator wheel and the shearing wheel, if there are no particles in the paint, the paint passes through the shear gap and flows to the front end of the shear chamber, then flows into the nozzle, and finally exits the spray gun through the spray nozzle. If there are particles in the paint, when the particles flow with the paint to the shear gap, particles larger than the size of the shear gap will remain in the shear gap. Since the shearing wheel and the agitator wheel rotate in opposite directions, the shearing wheel and the agitator wheel rotate in opposite directions. During the rotation of the wheels, the stirring wheel and the shearing wheel exert a shearing effect on the particles remaining in the shearing gap, thereby shearing particles larger than the shearing gap size to a size smaller than the shearing gap. Since the width A of the shearing gap is smaller than the diameter B of the spray nozzle, after being sheared by the shearing wheel and the stirring wheel, the size of the sheared particles is smaller than the diameter of the spray nozzle, so that the sheared particles can be discharged from the spray nozzle. This avoids the particles in the paint from clogging the spray nozzle, thus ensuring the uniformity of the output during spraying. By setting up the shearing wheel and the stirring wheel, large particle impurities are sheared and broken, thereby ensuring the smoothness of paint delivery and ensuring spraying efficiency.

[0010] Preferably, the drive assembly includes an impeller, a drive gear, a driven gear, a drive shaft, and a driven shaft. The gun body has an air chamber and a transmission gear slot. The air chamber is located at the rear of the gun body and communicates with the main air supply channel. An exhaust port is located on the side of the air chamber away from the main air supply channel. Both ends of the exhaust port communicate with the inner and outer sides of the air chamber, respectively. The air chamber is coaxially arranged with the paint channel. The impeller is coaxially installed inside the air chamber. The drive shaft is coaxially fixedly installed with the impeller, and the end of the drive shaft away from the impeller is coaxially fixedly installed with a shearing wheel. The drive gear is coaxially fixedly installed with the drive shaft and is located between the impeller and the shearing wheel. The driven gear meshes with the drive gear. The driven shaft is coaxially fixedly installed with the driven gear, and the end of the driven shaft away from the driven gear is coaxially fixedly installed with a stirring wheel. Both the drive gear and the driven gear are installed in the transmission gear slot.

[0011] With the impeller and drive shaft configured, when compressed gas flows in the main gas delivery channel, the compressed gas enters the gas chamber, blowing the impeller to rotate, and then exits from the exhaust port. The impeller and drive shaft are coaxially fixedly installed, and the impeller drives the drive shaft to rotate in the forward direction. The drive shaft is coaxially fixedly installed with the drive gear and shear wheel, and the drive shaft drives the drive gear and shear wheel to rotate in the forward direction. The driven gear is meshed with the drive gear. When the drive gear rotates in the forward direction, it drives the driven gear to rotate in the reverse direction. The driven gear is coaxially fixedly installed with the driven shaft and stirring wheel. When the driven gear rotates, it drives the driven shaft and stirring wheel to rotate in the reverse direction. Therefore, when the compressed gas blows the impeller to rotate, each shaft drives the shear wheel and stirring wheel to rotate in the opposite direction, thereby ensuring that the shear wheel and stirring wheel generate shearing and crushing forces, thus ensuring the effect of shearing particles; avoiding the blockage of the paint nozzle by particles in the paint, thus ensuring the uniformity of material output during spraying.

[0012] Preferably, the gun body has a stirring chamber located between the shearing chamber and the transmission gear groove. The coating channel is coaxially arranged with the stirring chamber and completely penetrates both ends of the stirring chamber. The stirring chamber contains a shearing wheel and multiple stirring wheels with their front ends flush. The shearing wheel is located at the front end of the multiple stirring wheels, and a crushing gap is provided between the shearing wheel and the stirring wheels. The width of the crushing gap is C, where C ≥ A.

[0013] A stirring chamber is set inside the gun body, and a crushing gap is set between the shear wheel and the stirring wheel in the stirring chamber. When compressed gas flows in the main gas supply channel, the airflow drives the shear wheel and the stirring wheel to rotate in opposite directions through the drive component. When the paint in the paint channel reaches the crushing gap between the stirring wheel and the shear wheel, if there are no particles in the paint, the paint passes through the crushing gap and flows to the front end of the stirring chamber, then flows into the shear chamber, then flows to the front end of the shear chamber again, and finally exits the spray gun through the spray nozzle. If there are particles in the paint, when the particles flow with the paint to the crushing gap, particles larger than the size of the crushing gap will remain in the crushing gap. Since the rotation direction of the shear wheel and the stirring wheel is opposite, the particles will remain in the crushing gap. During the rotation of the shearing wheel, the mixing wheel and the shearing wheel crush the particles remaining in the crushing gap, thereby shearing particles larger than the crushing gap size to a size smaller than the crushing gap. Since the width C of the crushing gap is greater than the width A of the shearing gap, after being crushed by the shearing wheel and the mixing wheel, when the crushed particles flow into the shearing chamber, the shearing force between the shearing wheel and the mixing wheel in the shearing chamber will not be increased due to the particles being too large, thus affecting the service life of the shearing wheel and the mixing wheel; it also avoids the shearing strength between the shearing wheel and the mixing wheel in the shearing chamber, thereby ensuring shearing efficiency; and it avoids particles in the paint from clogging the paint spray nozzle, thereby ensuring the uniformity of the output during spraying.

[0014] Preferably, the outer walls of the plurality of stirring wheels are provided with a plurality of inclined blades, the plurality of inclined blades are arranged in a circumferential array along the axis of the stirring wheel, and the plurality of inclined blades are all at an angle α with the axis, wherein 35°≤α≤60°. The outer walls of the shearing wheel are provided with a plurality of straight blades, the plurality of straight blades are arranged in a circumferential array along the axis of the shearing wheel, and the plurality of straight blades are all parallel to the axis of the shearing wheel.

[0015] Because the mixing wheel has inclined blades and the shearing wheel has straight blades, if the paint is not mixed sufficiently, unevenly stirred, or has an uneven flow rate, the coating quality will be reduced and the paint will be uneven after it is sprayed from the spray nozzle. To address this, by setting the mixing wheel with inclined blades and the shearing wheel with straight blades, the inclined blades on the mixing wheel can better stir the paint when it rotates, and the straight blades on the shearing wheel can rectify the paint flow. This avoids the coating quality reduction and uneven paint spraying caused by uneven stirring, and ensures the quality of the sprayed paint and the uniformity of the output.

[0016] Preferably, the inclined blade includes an inclined section and a straight section, the inclined section is located behind the stirring wheel, the straight section is located in front of the stirring wheel, the inclined section forms an angle α with the axis, and the straight section is parallel to the axis of the stirring wheel.

[0017] Because of the angle between the inclined blades and the straight blades, when the shearing wheel and the stirring wheel rotate relative to each other, if there are non-particulate impurities in the paint, these impurities are easily bent under the guidance of the inclined blades, resulting in a decrease in the shearing effect between the inclined blades and the straight blades. Therefore, by setting the inclined blades to have both inclined and straight sections, the straight section has no guiding effect when the stirring wheel and the shearing wheel rotate relative to each other. Thus, the shearing action between the straight blades and the straight section avoids the bending of non-particulate impurities within the crushing and shearing gaps. This ensures the shearing and crushing effect between the shearing wheel and the stirring wheel, thereby preventing particulate matter in the paint from clogging the spray nozzle and ensuring uniform material output during spraying.

[0018] Preferably, reinforcing plates are provided on both the straight blade and the straight section. The reinforcing plates on the straight blade are located on one side wall in the forward rotation direction of the shearing wheel, and the reinforcing plates on the straight section are located on one side wall in the forward rotation direction of the stirring wheel.

[0019] When the straight blades and straight sections crush and shear particles, the particles exert a reaction force on both blades and sections, causing damage to their surfaces and reducing their service life and shearing effect. Therefore, reinforcing plates are installed on the straight blades and sections to ensure their wear resistance and hardness, thus guaranteeing the shearing effect. This also prevents particles in the paint from clogging the spray nozzles, ensuring uniform material output during spraying.

[0020] Preferably, the outer walls of the stirring wheel, shearing wheel, drive shaft, and driven shaft, as well as the inner wall of the coating channel, are all provided with an anti-stick coating, which includes any one of polytetrafluoroethylene, organosilicon, and fluorocarbon.

[0021] By providing anti-stick coatings on the outer walls of the stirring wheel, shearing wheel, drive shaft, and driven shaft, and on the inner wall of the paint channel, the paint enters the paint channel from the inlet, flows through the stirring wheel and shearing wheel in the crushing gap, then through the stirring wheel and shearing wheel in the shearing gap, and finally exits from the spray nozzle. If the outer walls of the stirring wheel, shearing wheel, drive shaft, and driven shaft, and the inner wall of the paint channel are not provided with anti-stick coatings, the paint will stick to the inner wall of the paint channel, affecting the paint delivery; paint sticking to the stirring wheel and shearing wheel will affect the shearing effect; paint sticking to the drive shaft and driven shaft will affect the rotation efficiency. Therefore, by providing anti-stick coatings, the paint can be smoothly sprayed out of the spray nozzle; the paint delivery is not affected when it sticks to the paint channel wall; the shearing effect is reduced when it sticks to the stirring wheel and shearing wheel; and the rotation efficiency is reduced when it sticks to the drive shaft and driven shaft. This ensures the shearing effect, prevents particulate matter in the paint from clogging the spray nozzle, and ensures the uniformity of the output during spraying.

[0022] Preferably, the gun body is provided with a sealing groove, which is located between the paint channel and the transmission gear groove. The sealing groove is provided with two extrusion plates and a sealing gasket. The sealing gasket is located between the extrusion plates and is made of elastic material. The sealing gasket and the extrusion plates are provided with three through holes. The drive shaft and the driven shaft pass through the three through holes respectively, and the drive shaft and the driven shaft are rotatably connected to the sealing gasket.

[0023] By using extrusion plates and sealing gaskets, when the paint enters the paint channel, it compresses the extrusion plates on the paint channel side. Gas enters the extrusion plates on the transmission gear groove side from the gas chamber and is also compressed. When the extrusion plates on both sides are compressing, the elastic sealing gasket in the middle is deformed by the extrusion force, forming a seal between the drive shaft and the driven shaft, thus separating the paint and gas. This prevents the paint from flowing into the transmission gear groove and the gas chamber and flowing out of the exhaust port, and prevents gas from entering the paint channel and generating bubbles that would cause intermittent painting, ensuring the uniformity of the paint output during spraying.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. This invention uses a shearing wheel and a stirring wheel that rotate in opposite directions, with a shearing gap between them. Particles in the paint larger than the shearing gap will remain within the gap. The stirring wheel and the shearing wheel will shear the particles within the gap. After being sheared by the shearing wheel and the stirring wheel, the size of the sheared particles is smaller than the diameter of the spray nozzle, allowing them to be discharged from the nozzle. This avoids clogging the spray nozzle with particles in the paint, thus ensuring uniformity of the spray output during spraying.

[0026] 2. This invention, by setting inclined blades on the stirring wheel and straight blades on the shearing wheel, allows for better mixing of the coating material by the inclined blades and rectification of the coating material by the straight blades on the shearing wheel. This avoids the problems of insufficient mixing and uneven stirring of the coating material, which can lead to a decrease in coating quality and uneven spraying after the coating material is sprayed from the spray nozzle. This ensures the quality of the sprayed coating material and the uniformity of the output.

[0027] 3. By configuring the inclined blades into inclined and straight sections, the straight section has no guiding effect when the stirring wheel and shearing wheel rotate relative to each other. Therefore, the straight blades and the straight section perform shearing action, preventing non-particulate impurities from bending within the crushing and shearing gaps. This ensures the shearing and crushing effect between the shearing wheel and the stirring wheel, thereby preventing particulate matter in the paint from clogging the spray nozzle and ensuring uniform material output during spraying. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the paint spray gun of the present invention;

[0029] Figure 2 for Figure 1 Full sectional view at point AA;

[0030] Figure 3 for Figure 2 Full cross-section view at point BB;

[0031] Figure 4 for Figure 3 Sectional view at CC;

[0032] Figure 5 for Figure 3 A magnified view of part D;

[0033] Figure 6 for Figure 3 A magnified view of part E in the image;

[0034] In the diagram: 1. Gun body; 101. Air inlet; 102. Main air supply channel; 103. Branch air supply channel; 104. Air chamber; 105. Transmission gear groove; 106. Feed inlet; 107. Paint channel; 108. No. 1 stirring chamber; 109. No. 2 stirring chamber; 110. Shearing chamber; 111. Exhaust port; 112. Sealing groove; 2. Nozzle; 201. Paint spray nozzle; 202. Air jet nozzle; 3. Impeller; 4. Drive shaft; 5. Driven shaft; 6. Drive gear; 7. Driven gear; 8. Stirring wheel; 801. Inclined blade; 8011. Inclined section; 8012. Straight section; 802. Reinforcing plate; 9. Shearing wheel; 901. Straight blade; 902. Shearing gap; 903. Crushing gap; 10. Extrusion plate; 11. Sealing gasket; S1. Reverse rotation direction; S2. Forward rotation direction. Detailed Implementation

[0035] Please see Figures 1 to 6 This invention provides an automated powder coating production line for stamped parts, the technical solution of which is as follows:

[0036] Please see Figures 1 to 3An automated powder coating production line for stamped parts includes a gun body 1 and a nozzle 2. The gun body 1 has a main air supply channel 102, a branch air supply channel 103, and a paint supply channel 107. The nozzle 2 is threaded to the front end of the gun body 1. The nozzle 2 has a paint spray nozzle 201 and multiple air jet nozzles 202. The paint spray nozzle 201 communicates with the paint supply channel 107, and the air jet nozzles 202 are connected to the main air supply channel 102 through the branch air supply channel 103. Specifically, a shearing chamber 110 is formed inside the gun body 1. The paint supply channel 107 is coaxially arranged with the shearing chamber 110 and completely penetrates both ends of the shearing chamber 110. The cutting cavity 110 contains a shearing wheel 9 and multiple stirring wheels 8. The front ends of the multiple stirring wheels 8 are flush. The shearing wheel 9 is located at the front end of the multiple stirring wheels 8, and a shearing gap 902 is provided between the shearing wheel 9 and the stirring wheels 8. The width of the shearing gap 902 is 0.9 mm. The diameter of the paint spray nozzle 201 is 1 mm. The gun body 1 contains a drive assembly, which includes an impeller 3, a drive gear 6, a driven gear 7, a drive shaft 4, and a driven shaft 5. The gun body 1 contains an air chamber 104 and a transmission gear groove 105. The air chamber 104 is located on the rear side of the gun body 1 and is connected to the main air supply channel 102. An exhaust port 111 is provided on the side away from the main gas transmission channel 102. Both ends of the exhaust port 111 are connected to the inner and outer sides of the gas chamber 104, respectively. The gas chamber 104 is coaxially arranged with the paint channel 107. The impeller 3 is coaxially installed inside the gas chamber 104. The drive shaft 4 is coaxially fixedly installed with the impeller 3, and the end of the drive shaft 4 away from the impeller 3 is coaxially fixedly installed with the shear wheel 9. The drive gear 6 is coaxially fixedly installed with the drive shaft 4, and the drive gear 6 is located between the impeller 3 and the shear wheel 9. The driven gear 7 is meshed with the drive gear 6. The driven shaft 5 is coaxially fixedly installed with the driven gear 7, and the driven shaft 5 is located away from the driven gear 7. One end of wheel 7 is coaxially fixedly installed with stirring wheel 8. Both drive gear 6 and driven gear 7 are installed in transmission gear groove 105. A sealing groove 112 is provided in gun body 1. The sealing groove 112 is located between paint channel 107 and transmission gear groove 105. Two extrusion plates 10 and a sealing gasket 11 are provided in the sealing groove 112. The sealing gasket 11 is located between the extrusion plates 10 and is made of elastic material. The sealing gasket 11 and the extrusion plates 10 are provided with three through holes. Drive shaft 4 and driven shaft 5 pass through the three through holes respectively, and drive shaft 4 and driven shaft 5 are rotatably connected to sealing gasket 11.

[0037] Please see Figures 3 to 6The gun body 1 has an internal stirring chamber located between the shearing chamber 110 and the transmission gear groove 105. The coating channel 107 is coaxially arranged with the stirring chamber and completely penetrates both ends of the stirring chamber. The stirring chamber contains one shearing wheel 9 and multiple stirring wheels 8. The front ends of the multiple stirring wheels 8 are flush. The shearing wheel 9 is located at the front end of the multiple stirring wheels 8, and a crushing gap 903 with a width of 1.2 mm is provided between the shearing wheel 9 and the stirring wheels 8. Multiple inclined blades 801 are provided on the outer walls of the multiple stirring wheels 8, arranged circumferentially along the axis of the stirring wheel 8, and each inclined blade 801 forms a 35° angle with the axis. Multiple straight blades 901 are provided on the outer walls of the shearing wheel 9, arranged circumferentially along the axis of the shearing wheel 9. Multiple straight blades 901 are parallel to the axis of the shear wheel 9; the inclined blade 801 includes an inclined section 8011 and a straight section 8012. The inclined section 8011 is located behind the stirring wheel 8, and the straight section is located in front of the stirring wheel 8. The inclined section 8011 forms an angle of 35° with the axis, and the straight section 8012 is parallel to the axis of the stirring wheel 8; both the straight blade 901 and the straight section 8012 are provided with reinforcing plates 802. The reinforcing plates 802 on the straight blade 901 are located on one side wall in the forward rotation direction S2 of the shear wheel 9, and the reinforcing plates 802 on the straight section 8012 are located on one side wall in the reverse rotation direction S1 of the stirring wheel 8; the outer walls of the stirring wheel 8, the shear wheel 9, the drive shaft 4, and the driven shaft 5, as well as the inner wall of the coating channel 107, are all provided with an anti-stick coating material made of polytetrafluoroethylene.

[0038] Please see Figures 2 to 6When compressed gas enters the main gas delivery channel 102 from the inlet 101, it flows into the gas chamber 104 and the gas delivery branch channel 103 respectively. After entering the gas delivery branch channel 103, the compressed gas enters the nozzle 2 and is ejected from the jet nozzle 202. After entering the gas chamber 104, the compressed gas blows the impeller 3 to rotate. The compressed gas then reaches the transmission gear groove 105 and then the sealing groove 112. Since there is a pressing plate 10 and a sealing gasket 11 in the sealing groove 112, the compressed gas exerts pressure on the pressing plate 10 and deforms the sealing gasket 11, forming a seal in the sealing groove 112. The compressed gas cannot enter the coating channel 107 and is then discharged from the exhaust port 111. Similarly, the other end of the coating channel 10... The coating inside the 7th chamber exerts pressure on the extrusion plate 10, deforming the sealing gasket 11 and forming a seal in the sealing groove 112, preventing the coating from entering the transmission gear groove 105. The impeller 3 drives the drive shaft 4 to rotate in the forward direction S2. The drive gear 6 and shear wheel 9, fixedly mounted on the drive shaft 4, also rotate in the forward direction S2. The rotation of the drive gear 6 drives the driven gear 7 to rotate in the reverse direction S1. The driven shaft 5 and stirring wheel 8, coaxially fixedly mounted with the driven gear 7, rotate in the reverse direction S1. When the coating is pressurized by compressed air, it is pushed from the feed inlet 106 into the coating channel 107 and then into the first stirring chamber 108, entering the crushing gap 90. 3. When particles larger than the crushing gap 903 are present, they will remain within the crushing gap 903. Since the shearing wheel 9 and the stirring wheel 8 rotate in opposite directions, during their rotation, the stirring wheel 8 and the shearing wheel 9 will crush the particles remaining in the crushing gap 903, thereby shearing particles larger than the crushing gap 903 to a size smaller than the crushing gap 903. The particles crushed by the first stirring chamber 108 then flow into the second stirring chamber 109. The second stirring chamber 109 operates on the same principle as the first stirring chamber 108, and the particles crushed by the second stirring chamber 109 then flow into the shearing gap of the shearing chamber 110. In section 902, particles larger than the size of the shear gap 902 will remain within the shear gap 902. Since the rotation directions of the shearing wheel 9 and the stirring wheel 8 are opposite, during the rotation of the stirring wheel 8 and the shearing wheel 9, the stirring wheel 8 and the shearing wheel 9 will generate a shearing action on the particles remaining in the shear gap 902, thereby shearing the particles larger than the size of the shear gap 902 to a size smaller than the shear gap 902. The width of the shear gap 902 is 0.9 mm, and the diameter of the paint nozzle 201 is 1 mm. The particles in the paint can then be sprayed out from the paint nozzle 201, thereby preventing the paint nozzle 201 from clogging. After stopping the machine, the paint gun is cleaned with clean water or a cleaning solvent corresponding to the paint.

[0039] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. An automatic surface plastic spraying pipeline for stamping parts, comprising a gun body (1) and a spray head (2), wherein a gas main passage (102), a gas branch passage (103) and a paint passage (107) are arranged in the gun body (1), the spray head (2) is threadedly connected to the front end of the gun body (1), the spray head (2) is provided with a paint spraying port (201) and a plurality of gas spraying ports (202), the paint spraying port (201) is in communication with the paint passage (107), and the gas spraying ports (202) are in communication with the gas main passage (102) through the gas branch passage (103), characterized in that, The gun body (1) is provided with a shearing cavity (110), the paint channel (107) is coaxially arranged with the shearing cavity (110) and completely penetrates the front and rear ends of the shearing cavity (110), the shearing cavity (110) is provided with a shearing wheel (9) and a plurality of stirring wheels (8), the front ends of the plurality of stirring wheels (8) are flush, the shearing wheel (9) is arranged at the front ends of the plurality of stirring wheels (8), and a shearing gap (902) is arranged between the shearing wheel (9) and the stirring wheel (8), the width of the shearing gap (902) is A, the diameter of the paint spraying port (201) is B, A<=B, the gun body (1) is provided with a driving assembly, the driving assembly is used for driving the shearing wheel (9) and the stirring wheel (8) to rotate, and the driving assembly is designed such that when compressed gas flows in the gas main channel (102), the compressed gas drives the shearing wheel (9) and the stirring wheel (8) to rotate in opposite directions through the driving assembly.

2. An automatic surface painting line for stamped parts according to claim 1, characterized in that, The driving assembly comprises an impeller (3), a driving gear (6), a driven gear (7), a driving shaft (4) and a driven shaft (5), the gun body (1) is provided with a gas chamber (104) and a transmission gear groove (105), the gas chamber (104) is arranged at the rear side of the gun body (1), the gas chamber (104) is in communication with the gas main channel (102), an exhaust port (111) is arranged on the side of the gas chamber (104) away from the gas main channel (102), the exhaust port (111) is in communication with the inner and outer sides of the gas chamber (104) at both ends, the gas chamber (104) is coaxially arranged with the paint channel (107), the impeller (3) is coaxially arranged in the gas chamber (104), the driving shaft (4) is coaxially fixedly arranged with the impeller (3), one end of the driving shaft (4) away from the impeller (3) is coaxially fixedly arranged with the shearing wheel (9), the driving gear (6) is coaxially fixedly arranged with the driving shaft (4), and the driving gear (6) is arranged between the impeller (3) and the shearing wheel (9), the driven gear (7) is meshingly arranged with the driving gear (6), the driven shaft (5) is coaxially fixedly arranged with the driven gear (7), and one end of the driven shaft (5) away from the driven gear (7) is coaxially fixedly arranged with the stirring wheel (8), and the driving gear (6) and the driven gear (7) are arranged in the transmission gear groove (105).

3. An automated surface painting line for stamped parts according to claim 2, characterized in that, The gun body (1) is provided with a stirring cavity, the stirring cavity is arranged between the shearing cavity (110) and the transmission gear groove (105), the paint channel (107) is coaxially arranged with the stirring cavity and completely penetrates the front and rear ends of the stirring cavity, the stirring cavity is provided with a shearing wheel (9) and a plurality of stirring wheels (8), the front ends of the plurality of stirring wheels (8) are flush, the shearing wheel (9) is arranged at the front ends of the plurality of stirring wheels (8), and a crushing gap (903) is arranged between the shearing wheel (9) and the stirring wheel (8), the width of the crushing gap (903) is C, and C>=A.

4. The automatic surface painting line for stamped parts according to claim 3, characterized in that, The outer side wall of the plurality of stirring wheels (8) is provided with a plurality of inclined blades (801), the plurality of inclined blades (801) are arranged along the axis of the stirring wheel (8), and the angle between the plurality of inclined blades (801) and the axis is α, and 35°≤α≤60°, the outer side wall of the shearing wheel (9) is provided with a plurality of straight blades (901), the plurality of straight blades (901) are arranged along the axis of the shearing wheel (9), and the plurality of straight blades (901) are parallel to the axis of the shearing wheel (9).

5. An automated surface painting line for stamped parts according to claim 4, characterized in that, The inclined blade (801) comprises an inclined section (8011) and a straight section (8012), the inclined section (8011) is located at the rear side of the stirring wheel (8), the straight section is located at the front side of the stirring wheel (8), the angle between the inclined section (8011) and the axis is α, and the straight section (8012) is parallel to the axis of the stirring wheel (8).

6. An automated surface painting line for stamped parts according to claim 5, characterized in that, The straight blade (901) and the straight section (8012) are provided with a reinforcing plate (802), the reinforcing plate (802) on the straight blade (901) is arranged on one side wall of the shearing wheel (9) in the forward direction (S2), and the reinforcing plate (802) on the straight section (8012) is arranged on one side wall of the stirring wheel (8) in the reverse direction (S1).

7. A surface painting line for a moving stamping part according to claim 3, wherein The outer walls of the stirring wheel (8), the shearing wheel (9), the driving shaft (4), the driven shaft (5) and the inner wall of the paint channel (107) are provided with an anti-sticking coating, and the anti-sticking coating comprises any one of polytetrafluoroethylene, silicone and fluorocarbon.

8. A surface painting line for a moving stamping part according to claim 2, wherein The gun body (1) is provided with a sealing groove (112), the sealing groove (112) is arranged between the paint channel (107) and the transmission gear groove (105), the sealing groove (112) is provided with two extrusion plates (10) and a sealing gasket (11), the sealing gasket (11) is arranged between the extrusion plates (10), the sealing gasket (11) is made of elastic material, the sealing gasket (11) and the extrusion plates (10) are provided with three through holes, the driving shaft (4) and the driven shaft (5) respectively penetrate the three through holes, and the driving shaft (4) and the driven shaft (5) are rotatably connected with the sealing gasket (11).

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