Industry News

Introduction of wear parts of shot blasting machine

2022-03-10
Shot blasting machines are well known in the machinery industry. Shot blasting machine is a processing technology that throws steel grit and steel shot at high speed on the surface of material objects through a shot blasting machine. It is faster and more efficient than other surface treatment techniques, and can be used for casting processes after part retention or stamping. In daily use, wear-resistant parts need to be replaced frequently. The reason is that the principle of rust removal is to blast the surface of the workpiece at a speed of 76m/s through the motor-driven shot blasting machine, so as to achieve the purpose of rust removal. In this way, both the projectile itself and the device itself will be greatly damaged during use.
So how to choose the right accessories?
The shot blasting machine is the core component of the shot blasting machine, and is also called the polishing head by the industry. Its quality directly determines the cleaning efficiency and service life of the shot blasting machine. Its wearing parts include: blade, shot wheel, directional sleeve, end guard and side guard, all of which are made of high-chromium wear-resistant cast iron. Among them, due to the large linear velocity in contact with the projectile, the blade wear is large and the service life is short. The service life is generally about 500 hours. When the wear is large, the cleaning efficiency of the shot blasting machine is low, and the control cabinet instrument of the equipment shows that the current of the shot blasting machine cannot reach the preset value. The second badly damaged wheel is the pill-dispensing wheel, which is the medium that delivers the pills to the blade. Although the wear level of the blades cannot be reached, the life of the pelletizing wheel is about 800 hours due to the rotational friction at 2400 rpm. The directional sleeve is a component used to adjust the spray angle. The principle is to adjust the spray angle by adjusting the angle of the sand outlet. If the wear is too large, the scattering of the projectile will occur, which will seriously affect the ejection effect. Due to relatively low friction with the projectile, the end and side guards typically have a lifespan in excess of 1000 hours.
When the shot blasting machine is working, the abrasive enters the center of the polishing head through the feeding port, and there is a shot dividing wheel in the center of the polishing head that rotates together with the polishing head. The outer side of the pelletizing wheel is a directional sleeve. The pelletizing wheel transports the abrasive to the end of the grinding disc near the center of the polishing head through the opening on the directional sleeve. Due to centrifugal force, the abrasive particles are accelerated along the length of the blade until they reach the tip of the blade and are extremely The high velocity hits the workpiece surface.
The blade in the polishing head is in direct contact with the abrasive, and its quality is closely related to the performance of the polishing head. The wear resistance of the blade directly determines the service life of the blade and the operating cost of the shot blasting machine. Therefore, the blade of the polishing head should be made of high wear-resistant material. The wear resistance of the blade is not only related to the blade material, but also 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 will be shortened by 80%.
When the impeller rotates at high speed, the wear or cracking of the blades can cause vibration. Therefore, it is necessary to check the integrity of the blades frequently and replace the defective blades in time. In order to ensure the stability of the polishing head, the blades must be replaced in pairs, that is, the blades opposite to the unqualified blades must be replaced at the same time to obtain a good dynamic balance. If a problem with the blades is suspected causing the throwing head to work abnormally, all blades will need to be replaced.
The abrasive used to reduce blade wear is steel shot. There are two reasons. One is that the particles of the steel shot are spherical. Another is that the hardness of steel shot is moderate. From an economic point of view, steel shot is the ideal abrasive for shot peening.
Daily maintenance of shot blasting machine accessories:
1. Check whether there are sundries falling into the machine, and remove them in time to prevent equipment failure caused by clogging each conveying link.
2. Check whether the screws of the shot blasting machine accessories are tightened before work.
3. Before operation, check the wear of wearing parts such as guard plates, blades, impellers, rubber curtains, directional sleeves, rollers, etc. twice every shift, and replace them in time.

4. Check the coordination of the moving parts of the electrical appliances, whether the bolt connections are loose, and tighten them in time.

5. Regularly check whether the oil filling of each part meets the regulations at the oil filling point of the shot blasting machine.
When the shot blasting machine is working, as long as the maintenance work of the shot blasting machine accessories is done, it will effectively extend the service life of the equipment and reduce the occurrence of failures. 





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