As a commonly used spraying tool, automatic spray guns will encounter various failures during daily use. There are often friends who tell me that the automatic spray gun is not working well. Next, Weiner Machinery will tell you about the common spray pattern defects of automatic spray guns and the corresponding solutions.
1. Spray pattern defect: spray pattern deformation
Reason: The air holes (fan-shaped holes or auxiliary atomization holes) on the hood are blocked by dry paint, so that the abnormal airflow deforms the spray pattern; incorrect air inlet pressure (too high/too low) causes the spray pattern to disconnect Or too small.
Solution: Clean the air holes on the spray gun and hood according to the cleaning instructions; adjust the air inlet pressure of the spray gun to normal air pressure.
2. Spray pattern defects: the spray pattern is narrow in the center and large at both ends
Reason: The paint viscosity is too low, the paint viscosity does not match the spraying air pressure; the spraying air pressure is too high, the fan-shaped hole air pressure is too high, so that the center of the spray frame is sunken; Make the center of the spray fan sunken.
Solution: Adjust the paint viscosity or switch to a nozzle with a suitable caliber; adjust the normal air inlet pressure of the automatic spray gun; use a suitable cleaning tool to clean the air hole of the hood, and replace the nozzle set if necessary.
3. Defects of spray pattern: the paint gathers in the center and the spray pattern cannot spread out
Reasons: the spraying air pressure is too low, and the fan-shaped hole air pressure is too low to press out the fan surface; the paint viscosity is too high, and the fan-shaped hole air pressure is not strong enough to press the high-viscosity paint into a fan surface; the nozzle is damaged and the spray range adjustment knob is not turned on.
Solution: adjust the normal air inlet pressure; adjust the paint viscosity, or switch to a nozzle with a suitable caliber. If the nozzle is damaged, replace the nozzle set; check whether the spray amplitude adjustment knob is fully opened.
4.the spray pattern defect: the spray pattern is bent in a banana shape
Reason: One of the fan-shaped holes is blocked or deformed, and the air pressure of the fan-shaped holes on both sides is inconsistent; the blockage of the atomization hole causes the air to run to the fan-shaped holes, causing the air pressure of one of the fan-shaped holes to increase.
Solution: Use a special cleaning kit to clean the hood of the automatic spray gun, and replace the nozzle kit if necessary.
5. Spray pattern defect: the wet area in the spray pattern is biased to one side
Reason: The fan-shaped hole or the atomization hole is blocked or deformed, and the atomized paint tends to one side due to the uneven air flow; the nozzle is damaged, and the gap between the atomization hole in the center of the hood and the nozzle is uneven, which makes the atomized paint tend to one side.
Solution: Use a special cleaning kit to clean the hood, and replace the nozzle kit if necessary.
6. Defects of the spray pattern: the spray pattern is twisted and inclined or formed into an S shape
Reason: The fan-shaped holes are blocked or deformed, and the diagonal fan-shaped holes on both sides are blocked or deformed so that the spray pattern is inclined.
Solution: Use a special cleaning kit to clean the hood, and replace the nozzle kit if necessary.
7. spray pattern defects: spray pattern is not continuous, beating
Reason: The nozzle of the automatic spray gun is not tightly installed, the nozzle and the air diverter ring are not completely sealed, and the air rushes to the paint passage; the nozzle or the air diverter ring is not clean, and the paint residue makes the nozzle and the air diverter ring not completely sealed; the air diverter ring Damage to the sealing surface affects the sealing between the nozzle and the nozzle; the vent of the gun pot is blocked, and the vent of the gun pot is blocked to create a vacuum to draw air from the nozzle into the paint channel.
Solution: Tighten the nozzle with an original wrench, clean the nozzle with a special cleaning kit, and replace the air diversion ring. Clean the vent of the gun pot and replace the gun pot if necessary.
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