The vibrating screen and the lower vibrating screen of the shot blasting machine are integrated into one elasticity through the leaf spring, and the lower vibrating screen is connected with the exciter. Under the action of the exciter, the lower vibrating screen and the upper vibrating screen generate the up and down vibrations, and thus The cleared mixture is sieved. The vibrating screen retains the lumps such as burrs on the fly, and the vibrating screen retains the shots, powders, and small particles. The common fault in production is the breakage of the leaf spring. The upper vibrating screen is elastically coupled to the lower vibrating screen via the leaf spring and generates vibration under the action of the exciter. Regardless of the weight of the upper vibrating screen, only the effect of the mixture cleaned by the shot blasting machine on the vibrating screen is considered. The mixture removed by the shot blasting machine falls onto the upper screen of the shaker screen and oscillates on the screen of the shaker screen. Each vibration cycle gives an impact force to the screen, so that the leaf spring withstands the bending action of the alternating impact load, and the inside of the leaf spring is Generate alternating stress. The more the mixture is cleaned, the stronger the impact on the leaf spring will be, and the more the alternating stress will be. When the alternating stress is greater than the fatigue strength of the material, the leaf spring will be fatigue-brittle. According to the knowledge of material mechanics, the bending moment generated at the two places of the leaf spring is the largest, and the fatigue is most likely to occur. And the mixture removed by the shot blasting machine is not evenly dropped. In the early stage of a batch of castings cleaning, the most falling mixture is the impact force on the vibration of the shot blasting machine and the greater the impact of the plate spring, the more likely the damage of the leaf spring is. Big. In the actual production, due to heavy cleaning tasks, the cleaning company excessively pursues the completion of production tasks, resulting in each batch of cleaned castings that may exceed the blasting capacity required by the shot blasting machine, resulting in an increase in the cleaned-up mixture, which is also the destruction of the leaf springs. One of the reasons for neglect.
Structural improvements
According to the phenomenon occurring in production and its analysis, the shot blasting machine refers to the structure related to the shaker and uses four compression springs instead of the original four leaf springs. In this way, the elastic member changes from bending deformation to compression deformation, and the compression spring has better elasticity and compression resistance. In addition, the plate spring in the original structure has elasticity in the vertical direction and in the left and right direction, while in the front-rear direction, the upper and lower vibrating screens are still rigidly coupled, and the compression spring has elasticity in three-dimensional directions, so that the upper and lower vibrating screens are maintained A real victory over the tie. In addition, we must pay attention to two points. First, select a compression spring with a relatively large stiffness so as to withstand a relatively large impact load. Second, consider the positioning of the compression spring during installation. In the vertical direction, bolts are used and in the horizontal direction, the positioning ring is used.
After the improvement, the blasting machine compression spring did not fail, and there was no accident on the vibrating screen, which ensured the smooth proceeding of the cleaning process, reduced the maintenance workload, and achieved good results.
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