The shot blasting machine is realized by relying on a high-speed rotating throwing head to throw the abrasive particles to the surface of the workpiece. The throwing head is provided with several blades.
During operation, the abrasive enters the center of the throwing head through the feeding port. In the center of the throwing head, there is a splitting wheel rotating together with the throwing head. The outer part of the splitting wheel is a directional sleeve, and the splitting wheel passes the abrasive through the opening of the directional sleeve. Send to the end of the blade near the center of the throwing head. Due to the centrifugal force, the abrasive particles accelerate along the length of the blade until reaching the tip of the blade and hit the surface of the workpiece at a very high speed.
The function of the splitting wheel is to properly "feed" the abrasive to the blade according to certain requirements. Once the opening of the splitting wheel is severely worn, the abrasive will hit the end of the blade, causing the blade to wear abnormally, and the divergent flow of the abrasive will Becomes no rules. Therefore, the wear of the pelletizing wheel should be checked regularly in accordance with the requirements of the instruction manual and the severely worn pelletizing wheel should be replaced in time.
The position of the orientation sleeve opening determines the position at which the abrasive is fed to the blade by the splitter wheel. The shape of the opening on the directional sleeve affects the divergence shape of the abrasive and the size of the hot zone. The so-called hot zone, even if the abrasive is concentrated on a divergent surface, is due to the uneven distribution of the abrasive on the blade. The positioning of the adjustable directional sleeve can be properly adjusted according to the wear condition of the opening to ensure that the throwing head works under good operating conditions.
The blade in the throwing head is in direct contact with the abrasive, and its quality is closely related to the performance of the throwing head.
The wear resistance of the blade directly determines the life of the blade and the operating cost of the shot blasting machine. Therefore, the blade of the throwing head is made of a highly wear-resistant material. In addition to the material of the blade, the wear resistance of the blade is closely related to the working conditions of the shot blasting machine. For example, if there is 1% sand in the abrasive, the life of the blade should be shortened by 80%. It is said that the life of the separation device determines the life of the shot blasting machine.
Blade wear or cracking can cause vibration when the impeller rotates at high speed. Therefore, always check the integrity of the blade, and the problematic blade should be replaced in time. In order to ensure the stability of the head running, the blade replacement must be carried out in pairs, that is, the blades opposite the undesired blades must be replaced at the same time to obtain a good dynamic balance. If you suspect that the blade problem is causing the head to work abnormally, you need to replace all the blades.
The casting defects of the blade will inevitably accelerate the wear of the blade, which is even more serious when using cold-excited cast iron pellets as abrasives. After analyzing the worn blades, it is considered that the blades with casting defects will cause the abrasive particles to bounce during the movement, and the bounced abrasive particles in turn cause erosion of the blades, thereby aggravating the wear of the blades. If sand is present in the abrasive, it will increase the wear of the blade.
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