The commonly used SPURUI spray gun usually consists of three main parts: gun head, adjustment part and gun body. The gun head includes the atomization cap, nozzle and needle valve. They are components that work together and cannot be mixed and matched at will. They need to be replaced as a whole set.
1. The structure and function of the gun head
The nozzle in the gun head is a component susceptible to wear and is usually made of alloy to improve wear resistance. The size of the nozzle diameter affects the amount of paint sprayed. If the air pressure is insufficient, the spray particles will be rough and the coating quality will be affected. The commonly used nozzle diameter range is 0.8~1.6mm, which is suitable for different types of paints, such as nitrocellulose paint and synthetic resin paint.
Nozzles with a diameter of 0.5~0.8mm are suitable for low viscosity coatings such as colorants. Nozzles of 1.0 to 1.6mm are suitable for topcoats, while nozzles of 2.0 to 2.5mm are suitable for slightly thicker coatings such as primers and midcoats. For coatings with larger particles and higher viscosity, such as plastisol and soundproof coatings, a 3.0 to 5.0mm nozzle is usually required. When spraying repair paint, you can choose a round nozzle with a diameter of 0.5mm. According to the painting area and needs, the nozzle diameter can also be adjusted. For example, 1~1.5mm can be selected for small areas, 2.5~3mm can be selected for large areas, and nozzles of 0.2~1.2mm are required for different patterns and text.
2. The function of the adjusting device
The adjustment device of SPURUI spray gun usually includes the center hole, side hole and auxiliary air hole on the atomization cap. The center hole is used to atomize paint, while the side holes can change the shape of the spray pattern. The auxiliary air holes help refine the paint atomization particles, distribute them evenly, and expand the spraying range.
Atomizer caps can be divided into few-hole type and multi-hole type. The few-hole type includes a central hole and two corner holes. The central hole is in the same circle as the paint nozzle. The gap between them controls the degree of paint atomization. The corner holes use compressed air to adjust the spray pattern to an oval shape.
There are multiple symmetrically arranged auxiliary air holes around the corner holes of the porous atomizing cap. The compressed air ejected from these holes helps adjust the size of the spray pattern and maintain stability, making the paint atomized finer and evenly distributed. In addition, the porous spray cap reduces the possibility of paint pooling around the paint nozzle, increasing the efficiency of the spray gun.
3. Gun body and operation
In addition to supporting the gun head and adjustment device, the gun body also contains the trigger and various seals to prevent leakage of paint and compressed air.
When you operate a paint spray gun, paint flows out through the nozzle, and the shape of the inner wall of the nozzle acts as a needle valve. Pulling the trigger moves the needle back, opening the nozzle and spraying paint. In order to prevent paint leakage, the nozzle and gun needle must fit tightly. The operation of the paint gun involves pulling the trigger so that the compressed air passage opens first, followed by the paint passage. In this way, the compressed air will blow the paint onto the workpiece. When the trigger is released, the small hole of the paint nozzle is closed by the ejector pin, which also closes the compressed air channel to avoid excessive paint accumulation on the surface of the workpiece.
4. Cleaning and maintenance
After spraying, excess paint should be recovered and the spray gun should be cleaned to prevent residual paint. When cleaning the spray gun, pour the corresponding thinner into the paint can, pull the trigger, and spray the solvent from the nozzle of the spray gun to clean the paint pipeline. Then turn off the air compressor, remove the spray gun, and wipe it clean with solvent. The atomizer cap, nozzle and gun body all need to be cleaned carefully with a brush containing solvent. If the air holes are blocked, use a cork needle to clear them. Cleaning is an important step in ensuring the proper functioning of your paint gun and maintaining its longevity.
To sum up, the different structural components of the SPURUI spray gun each play an important role, including controlling the paint flow, adjusting the spray pattern and maintaining stability. Understanding these structures and functions can help operators better use and maintain spray guns to obtain high-quality painting results.
Introduction to the different structures and functions of SPURUI paint spray guns
2024-04-08