The working principle of shot blasting machine

The working principle of the shot blasting machine :
Shot blasting is a method of shot blasting that has been applied in developed countries in Europe and America. The world's * blasting equipment was born 100 years ago, and began to apply impurities, oxide scale and roughness increase on various metal or non-metal surfaces. After a hundred years of development, the shot blasting process and equipment have been quite mature, and its application has not only been in the factories of various heavy industries. With the birth of the world's horizontal mobile shot blasting equipment in BLASTRAC, its application field has rapidly expanded to concrete surface coating treatment and ship deck metal surface treatment, and directly guided the industry's standard setting. And the specification of industry construction methods.

With the continuous improvement and mature technology of the 佰莱塔克 shot blasting equipment, the shot blasting process and equipment have entered the fields of highway maintenance, bridge construction and airport maintenance in developed countries in Europe and America. China's application in this area is still very small. Only in a few projects, the shot blasting process is used, and there is still a gap in the waterproof coating of highways, municipal roads and concrete bridges. GSD intends to use this article to introduce this new shot blasting process to the maintenance of construction of roads and bridges, and hopes that this new process and technology will be promoted.

1. Working principle of shot blasting process and shot blasting equipment

Shot blasting refers to mechanically spraying the pellets (steel shots or grit) onto the work surface at a high speed and a certain angle, causing the pellets to impact the working surface, and then cleaning the inside of the machine through the airflow of the matching vacuum cleaner. A technique in which the pellets and the cleaned impurities are separately recovered and the pellets can be reused. The shot blasting machine is equipped with a dust collector, which can achieve dust-free and pollution-free construction, which not only improves efficiency but also protects the environment. The shot blasting machine can be divided into three types according to its walking form: hand push type, vehicle type and self type.

When the shot blasting machine is operated, by controlling and selecting the particle size and shape of the pellets, and adjusting and setting the walking speed of the machine, the projectile flow rate of the pellets is controlled to obtain different ejection strengths, and different surface treatment effects are obtained.

1.2 Control of the quality of surface shot blasting

The shot blasting process and the shot blasting apparatus control the treated surface condition by three parameters depending on the surface to be processed. Select the size and shape of the pellets; the walking speed of the equipment; the flow rate of the pellets. The above three parameters cooperate with each other to obtain different treatment effects, and to ensure the ideal roughness of the surface after shot blasting.

For example: S330 steel shot, flow rate 10A, treatment of C50 concrete surface, can reach roughness 90; treatment of asphalt surface, can remove the oil layer, while achieving a roughness of 80; when dealing with steel, can achieve SA3 cleanliness standards.

Drum type shot blasting machine: It uses the impeller placed at high speed to throw the projectile to the castings and forgings that are constantly turned over by the drum, and remove the scale, so that the surface of the workpiece can be evenly cleaned, showing the metallic primary color.

Track type shot blasting machine: The workpiece is loaded by high-strength wear-resistant rubber track or manganese steel track. The high-speed projectile is thrown to the workpiece on the track by the blasting machine to achieve the purpose of cleaning.

Rotary shot blasting machine: The surface of the workpiece is subjected to uniform steel shot force by the variable frequency blasting machine, and the coverage of the steel shot on the surface is over 98% to achieve the strengthening effect.

Chain stepping shot blasting machine: The multi-station fixed-point projection cleaning method is used to remove the sand and oxide scale on the surface of the casting, so that the casting can reproduce the metallic color.

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