What is the problem with the poor effect of sandblasting machine after a period of use?

The effect of sandblasting machine after a period of use is not good, which may be caused by the following reasons:

In terms of sandblasting media

Abrasion and fragmentation of sand particles: With the increase of service time, sandblasting media (sand particles) will gradually wear and fragment. For example, the sand particles are regular in shape and uniform in size when just used, which can effectively treat the product surface. However, after a long time of sand blasting, the sand particles will rub and collide with each other and the surface of the sprayed object, which will lead to the abrasion and rounding of the sand particles and even break into smaller particles. The impact force of rounded sand particles is weakened, and the broken small particles will affect the roughness of sandblasting, which will make the surface treatment effect fail to meet expectations, such as the failure to effectively remove surface rust or old coating, and the failure to form sufficient roughness on the surface that needs roughening treatment.

Sand blocking: During sand blasting, sand may be blocked due to moisture and impurities. If the sand contains moisture, it will stick together and cannot pass through the sand blasting gun smoothly. In addition, when impurities on the surface of the sprayed product (such as plastic chips left in the injection process of plastic products) enter the sandblasting system and mix with sand particles, the sandblasting pipeline may also be blocked. Once the blockage occurs, the uniformity of sandblasting will be affected, resulting in insufficient sandblasting in some areas and uneven surface quality of products.

Inappropriate sand type: If the initially selected sand type is not suitable for the subsequent sand blasting operation, the problem will gradually appear with the passage of time. For example, for products that need high-precision surface treatment, coarse sand particles are selected at first, and after a period of time, the surface of the product may be excessively rough. Or when cleaning the surface of some soft materials, sand particles with high hardness are used, which is easy to damage the product surface, and in the subsequent sandblasting process, these unsuitable sand particles may wear themselves quickly because of excessive damage to the product surface, which affects the sandblasting effect.

Hardware aspects of sandblasting equipment

Abrasion of sandblasting gun: Sandblasting gun is a key component of sandblasting machine, which will be worn after long-term use. For example, the inner diameter of the nozzle of the sandblasting gun will gradually increase due to the erosion of high-speed sand particles, which will lead to the decrease of sandblasting pressure and sand particle injection speed. Moreover, the worn nozzle may not be able to ensure the spraying direction of sand particles, so that the sand particles cannot vertically impact the surface of the sprayed object, thus affecting the uniformity and quality of sandblasting effect. In addition, if the gun body of the sandblasting gun is poorly sealed, it will lead to air leakage during sandblasting, which will further affect the pressure and flow of sandblasting and make the sandblasting strength insufficient.

Problem of sandblasting tank: the pressure of sandblasting tank may be unstable during use. If the inlet valve and exhaust valve of the sandblasting tank fail, the pressure in the tank will not reach the set value or the pressure fluctuation will be too large. When the pressure is insufficient, the sand particles can't get enough power, and the sandblasting effect will be greatly reduced; Excessive pressure fluctuation will make it difficult to control the strength and uniformity of sandblasting. In addition, if the stirring device inside the sandblasting tank fails, the sand particles can not be evenly distributed in the tank, which will lead to uneven sand particle flow during sandblasting and affect the surface treatment effect of the product.

Failure of conveying system: The sand conveying system of sandblasting machine includes pipes, valves and other parts. With the passage of time, these components may be worn, blocked or leaked. For example, after the inner wall of the transportation pipeline is worn, its inner diameter changes, which may affect the transportation speed and flow rate of sand particles. If the valve is not tightly sealed, it will lead to sand leakage, which will reduce the amount of sand actually reaching the sandblasting gun, thus affecting the sandblasting effect. Moreover, if the filter in the conveying system is blocked, it will limit the supply of sand particles, and at the same time, it may also let impurities into the sandblasting gun, which will have a negative impact on the sandblasting quality.

Operation and maintenance aspects

Improper setting of sandblasting parameters: If the sandblasting parameters are not adjusted in time according to the actual changes of products and the state of sand particles during the use of sandblasting machine, the sandblasting effect will be poor. For example, with the wear of sand particles, it is necessary to increase the sandblasting pressure or time appropriately to achieve the original surface treatment effect, but the operator did not make corresponding adjustments. In addition, different batches of products may have different requirements for sandblasting parameters. If the parameters are not optimized according to the characteristics of products (such as material, size, shape, etc.), there will be excessive or insufficient sandblasting.

Insufficient cleaning and maintenance of equipment: the sandblasting machine needs to be cleaned and maintained regularly, otherwise its use effect will be affected. If parts such as sandblasting tank, pipeline and sandblasting gun are not cleaned for a long time, sand residue, dust and debris of sprayed products will accumulate inside the equipment. These deposits will interfere with the normal transportation and injection of sand particles, and may also affect the performance of equipment, such as increasing the wear and tear of equipment and reducing the accuracy of sandblasting. Moreover, the lack of regular equipment maintenance, such as not replacing worn parts in time and checking the tightness of equipment, will also lead to the poor effect of sandblasting machine after a period of use.