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Daming Sand blasting and Painting Service Solutions

Our Daming Sand blasting and Painting Service using the sand blasting machine can use different materials and particle sizes at the same time, so as to meet different process requirements. The processing capacity of this equipment ranges from 3-120mm in thickness, 700mm in height, 1300mm in width and 4000mm in length. Since its commissioning, it has been receiving orders continuously, and has provided supporting services for XCMG Group and a large number of construction machinery parts sand blasting and spraying processing.

How to Choose the Best sand blasting and painting equipment?

sand blasting and painting Equipment: Air spraying is a spraying method that uses compressed air to atomize the paint, which is widely used in automobile, furniture and various industries, and it can be said to be a painting method that is easy to operate, easy to change colors, has good atomization effect, and can obtain high-quality surfaces with detailed modification. Spray gun structure is simple, inexpensive, according to the shape and size of the workpiece can be adjusted at will spray shape (round or fan), and the spray width (fan size), in order to maximize the yield of paint. So far, this spraying method is still popular. However, the paint transfer efficiency of this spraying method is only 25%-40%, and the wavy spray is often prone to rebound and overspray and other shortcomings. Not only is the paint wasted, but it also causes considerable pollution to the environment. As the paint and compressed air in direct contact, so the compressed air requires purification, otherwise the water and oil in the compressed air mixed into the paint, will make the coating bubbles and whitening and loss of light and other ills, therefore, the need for compressed air piping in the separation of adsorption filters or freeze-drying filters, such as water filtration devices to purify the compressed air, especially in the south and the rainy season when the air humidity is greater, more necessary.

Air spray gun can be divided into pressure type, siphon type and gravity type three kinds according to the feeding method. Pressure type spray gun through the pressure of the pressure tank or double diaphragm pump pressure will be transported to the paint spray gun. The gun itself does not have a tank, which reduces the weight of the gun, reduces the labor intensity of the operation, and is particularly suitable for uninterrupted operation on continuous surfaces, avoiding stoppages caused by refilling and improving work efficiency to achieve the best spraying quality. The gun can be operated at any position and angle. The lower part of the siphon gun is equipped with a paint tank, compressed air generates a low-pressure vacuum in the front part of the gun, and atmospheric pressure sucks the paint from the paint tank to the gun. The paint tanks are divided into two types: 600 ml and 1,000 ml, which can be selected according to the size of the spraying volume. The spray gun can be operated with compressed air and no other equipment is required. However, it can only be operated horizontally and the tilting of the spray gun is limited.

Gravity type spray gun has a paint tank on the upper part of the gun, and the paint is transported to the gun by gravity. According to the position of the paint tank relative to the axis of the gun, it can be divided into the side type and the central type. During operation, the central type restricts the tilt of the gun, while the side type allows the operator to spray in different positions while the paint can remains vertical. The disadvantage of the side-by-side type is the smaller size of the paint can, typically 400 ml, and lower productivity. However, the biggest advantage of the gravity type is that there is very little paint waste. It is very easy to clean and consumes less solvent.

High-pressure airless sprayer: High-pressure Sand blasting and Painting is a more advanced spraying method, using a booster pump to increase the paint to high pressure (commonly used pressure 120-390kg/cm2), through the very fine spray holes to spray the paint to form a fan-shaped mist. In the spraying of large panels, up to 600m2/h, and can spray thicker coatings, due to the paint is not mixed into the air, is conducive to the improvement of surface quality. And because of the lower spray width forward rate and higher paint transfer efficiency and productivity, so Sand blasting and Painting in these aspects is obviously better than air spraying.

High-pressure Sand blasting and Painting equipment can be divided into two categories according to the power of electric and pneumatic, electric 220V alternating current as power, does not require compressed air, and low noise, not only can be used in the workshop, and is suitable for mobile operation and external walls, high-altitude work. Pneumatic type is powered by 5-8kg/cm2 compressed air, which is suitable for use in workshop and field construction. Since the compressed air is not in contact with the paint, there is no purification requirement for the compressed air. In the field without power supply occasions and mobile occasions, can be driven by gasoline engine high-pressure airless sprayer, also able to work, and unattached, easy to move.

The shortcomings of Sand blasting and Painting is that it has a large amount of paint and the paint mist is soft enough, so it is not easy to control the thickness of the coating, and it is not as detailed as air spraying when doing fine spraying. Due to the high working efficiency, it is more suitable for the mass production of large workpieces with a single type of paint. The spray gun has a rotary cleaning nozzle, which is suitable for coarser particles of paint and is easy to operate.

Air-assisted Sand blasting and Painting equipment: air spraying can provide good surface quality, but the rebound is large, the paint utilization rate is low, and the work efficiency is low, while the high-pressure Sand blasting and Painting is the opposite, which can improve the utilization rate of the paint and the work efficiency, and the paint output is large, but the atomization effect is not ideal, and it is not as detailed as air spraying when doing fine spraying, and the air-assisted Sand blasting and Painting (AA) is a new product that combines the advantages of both of them, without the shortcomings of both of them. Air-assisted Sand blasting and Painting (AA) is a new spraying method that combines the advantages of the above two without the shortcomings of the two, is between air spraying and Sand blasting and Painting, the use of Sand blasting and Painting low rate of advancement of the spray width and reduce the pressure of the paint in order to further reduce the rate of advancement of the spray width, but the rate of advancement of the spray width of the Sand blasting and Painting is too low, the spray width of the shortcomings produced by the atomization of the unevenness of the air, in order to remove this shortcoming can be added to a small amount of air, so the system has a nozzle such as Sand blasting and Painting and air cap of the air spraying. This is why the system has a nozzle as in the case of Sand blasting and Painting and an air cap as in the case of air spraying. A small amount of low-pressure atomized air (about 1kg/cm2) enters both sides of the air cap and produces a uniform spray pattern, and the paint mist becomes very soft and fine. The paint transfer efficiency is about 60-80%. And the coating quality is excellent. This spraying method has a wide range of applications and is an ideal spraying method worth popularizing, applicable to a wide range of paint types.

Electrostatic spraying machine: Electrostatic spraying has been widely used since its development in the 50’s. It can be applied in combination with the three basic spraying methods mentioned above, synthesizing their advantages into a new spraying method. Between the grounded workpiece and the spray gun plus DC high voltage, will produce an electrostatic field, charged paint particles sprayed to the workpiece, after mutual collision uniformly deposited on the surface of the workpiece, those scattered in the vicinity of the workpiece paint micro material is still in the electrostatic field within the scope of the role of the field, it will be surrounded by the workpiece around, so that it is sprayed on all surfaces of the workpiece. Therefore, it is especially suitable for spraying fences, pipes, small steel structures, steel pipe products, diesel engines and other workpieces with complex geometries and small surface areas, and it can conveniently and quickly spray the paint to every part of the workpieces, which can reduce the overspray of the paint and save the paint. Coating transfer efficiency up to 60-85% and its atomization situation is very good, the film thickness is uniform, conducive to product quality, in wood furniture, electrostatic spray gun can also achieve good static ring effect, especially suitable for chairs, coffee table, car wood products and other workpieces. However, electrostatic spraying on the viscosity and conductivity of the coating have certain requirements, not all coatings are suitable for electrostatic spraying, and the investment in equipment is also larger.

To provide the best atomization effect of the powerless electrostatic spray gun, it removes the high-voltage electrostatic generator and connecting cables, but by the installation of the gun body inside the air-powered small turbine generator components to generate electrostatic high pressure, very safe and convenient.

Electrostatic spray gun, not only has a very good surface quality, and there are great economic benefits, although a more investment, but because of the savings of 40% of the paint and more than double the working time, so in a short period of time can recover all the investment.

Low Volume Medium Pressure Spraying Equipment: Low Volume Medium Pressure Spraying (above referred to as LVMP) is a new type of coating equipment in which the compressed air used for atomization of paints is ultra-low pressure (commonly used 0.2-0.7kg/cm2) and large air volume. Its paint transfer efficiency is as high as 65% or more, and its high paint transfer efficiency is due to the low pressure of the atomizing air so that the spray width forward rate is reduced by the results obtained. the shape of the LVMP spray gun is basically similar to the traditional air spray gun, but its nozzles and needle valves are less abrasive, and the design of its air cap is not the same as that of the traditional spray gun, the biggest advantage of the LVMP spray gun is that it is much higher than the traditional paint yield air spray gun. The biggest advantage of the LVMP gun is that its paint yield is much higher than that of conventional air spray guns. It is especially suitable for single piece, small batch of complex shape, high surface requirements of the workpiece for fine spraying and the environment requires no pollution occasions. However, the gun can only spray low viscosity paint (〈24 seconds〉, the paint is also slower, the production efficiency is not high.

LVMP spray gun according to the power points have two kinds of pneumatic and electric, pneumatic is the purification of compressed air, through a pressure regulator, sent to the gun. The electric type is powered by a turbine pressure fan with a large air volume. Pressure fan working voltage 220V, very suitable for the role of the flow, due to the pressure fan turbine blades rotating at high speed with the air friction and heat, so that the air temperature sent to the spray gun than the room temperature to be higher than the room temperature 15-20 ° C. And the humidity is greatly reduced, which helps the paint. And the humidity is greatly reduced, which helps the atomization of the coating and shortens the drying time of the coating, and prevents the phenomenon of whitening and loss of light of the coating, which is easy to be produced in the rainy season and high humidity.