High Pressure Airless Spraying Technology Consulting

Equipment consists of: cylinder, frame, high pressure hose, high pressure spray gun, pressure regulator, pressure storage filter, bleeder valve, high pressure plunger pump, suction lacquer and other components. The cylinder and the high-pressure piston pump form a high-pressure pump.

The cylinder of the high-pressure pump is larger than the piston cylinder, so it plays a role in increasing the pressure of the paint. The ratio of the effective area of ​​the two pistons is 36:1. That is, the cylinder pressure is 0.5 MPa. The pressure in the piston cylinder can reach 18 trillion. Pa. Moreover, because the upper cylinder and the lower cylinder are separated and the compressed air does not come into contact with the paint, compressed air cannot be mixed in the sprayed paint flow. There is also a reversing mechanism in the high-pressure pump to control the commutation of the piston to make the cylinder piston reciprocate. The plunger cylinder is equipped with two steel balls, and the coating pressure difference is used for automatic opening and closing to control the suction and extrusion of the coating.

The inner layer of the high-pressure hose is braided with nylon, the outer layer is knitted with stainless steel wire, and then wrapped with plastic, it is easy to wash. It is the channel that carries the high pressure material to the gun. The pressure regulator valve is used to switch on the air supply and regulate the inlet pressure.

Accumulator filters have two functions. One is to stabilize the paint pressure so that paint pressure does not fluctuate too much during the spraying operation. The second is that when the paint passes through the filter, debris can be filtered out to avoid clogging the nozzle during the spraying process. The bleeder valve is a needle valve that can withstand high pressure. There are two devices in the device. One is installed between the accumulator filter and the hose, and the paint channel is opened and closed. The other is installed at the bottom of the accumulator filter. Used for draining excess pressure on the accumulator filter.

The lacquer ware is immersed in the paint container. When the plunger piston moves up and down, the paint can be sucked in. It is equipped with a 60 mesh filter per square inch. It is the first filter in high pressure airless spray equipment to prevent paint. The impurities in the suction cylinder.

Second, high-pressure airless equipment before spraying what preparations?

1, adjust the compressed air pressure 0.4 ~ 0.6 MPa. 2. Clean the equipment with solvent. 3. The paint to be sprayed is filtered through a 100 mesh/square inch filter to prevent impurities in the paint from entering the device. 4. Install the high-pressure hose, one end is connected with the spray gun, and one end is connected with the pressure accumulator. 5. Connect the regulated compressed air to the air inlet pipe to start the air pump, then immerse the lacquer absorber in the solvent and inhale the solvent. Immediately pull the spray gun trigger to allow the solvent to be cleaned in the lacquer circuit for 3 to 4 minutes during this process. Always trigger the gun to avoid high pressure leaks. After cleaning, release the solvent from the drain valve. 6. Immerse the lacquer absorber in the filtered paint. When the pump draws in the paint, close the trigger of the spray gun. When the paint pressure rises to about 15 MPa, check the connections of the pressure accumulator, joints, hoses, and spray guns for leaks. . If it is normal, nozzle spray can be installed.

Third, high pressure airless spraying equipment construction should pay attention to what?

1. The distance between the spray gun and the steel drum and the moving speed of the spray gun should be mastered when spraying. The distance between the spray gun and the steel drum has a great influence on the coating film. The distance between them is too far, or the spray gun moves fast. The thin coating film on the surface of the drum, or even pitting, is too close or the gun moves slowly, the coating will be affected by the impact and produce uneven orange and coating film, and will produce coating sag, general spray gun and The distance between the steel drums is between 250 and 400mm. The spray gun movement speed is 0.3~1.2m/s. The fixed spray equipment on our drum line should also refer to this standard to adjust the distance between the spray gun and the steel drums and the spray guns and steel drums. The relative speed of movement.

2. When the rest time is short, the paint in the pipeline does not need to be completely discharged. Only the gas source needs to be turned off. The bolting mechanism can be used to release a part of the paint so that the pressure in the pipeline can be reduced and the gun head can be immersed in the solvent. , In order to avoid the residual paint on the nozzle of the gun end solid and affect the next spraying.

3, in the spraying process, when the impurities in the coating clog the nozzle hole, the nozzle can be removed, washed with solvent and then brushed with a hair, or use compressed air to blow away impurities, reinstall it, but Do not use sharp small needles, so as not to scratch the hair spray nozzles and affect the quality of spray paint.

4, in addition should also pay attention to four points: (1) high-pressure hose pressure should not exceed 25 MPa; (2) do not use high-pressure hose when the extreme bending, do not use foot stamping or wheel rolling; (3) often clean the filter filter to ensure good Filtration; (4) At the piston rod of the expansion cylinder of the inner wall of the cylinder, regular lubrication is applied.
5. After spraying, the air source should be turned off, the release valve should be opened, and the paint should be let off. Place the lacquer absorber in the solvent and inhale the solvent to circulate and clean. This work must be done carefully, especially when the spraying viscosity is high or easy to precipitate. The paint is more adaptable and cannot be sloppy.