Research On Blade Of Impeller Head For MJ1516 Shot Blasting Machine

The impeller head is the core part of the whole shot blasting machine.It is also the core part of the shot blasting.As the direct bearing structure of the shot,the structure,shape and curvature have an important influence on the speed of the ball throwing.It is the key component in the shot blasting machine.In this paper,aiming at the problem of low shot blasting efficiency in the use of the MJ1516 shot blasting machine of Baoding Spencer Blast Cleaning Equipment Co.,Ltd.,the simulation and optimization of the blades are carried out by the analysis method of discrete element and finite element method,and the analysis results are applied to the practice.The main contents of this paper are as follows:(1)The factors that affect the speed of projectile thrown during the actual production process are analyzed,and the front curved blade is determined as the optimization object.In view of the influencing factors,under the premise of satisfying the working condition of shot blasting,the front curved blade is optimized as a combination of surface and plane.Three optimization schemes for blade are designed.Finally,it can reduce the jumping phenomenon of the projectile,reduce the wear degree of the blades and increase the speed of shot blasting.(2)Using SolidWorks 3D software to draw 3D solid models of key parts of shot blasting machine,and introduced into the EDEM finite element analysis software.The projectile simulation of the shot blasting system before and after the blade optimization is carried out by using EDEM discrete element analysis software.According to the material properties of the main components,the parameters are set,the velocity of shot pellets at different time points at the same time is analyzed,the velocity-time curve is obtained,under the motion state,maximum velocity time curve and mean velocity time curve of the three optimization schemes at different times were compared,the cause of each point of the curve is analyzed effectively and the absolute velocity of the projectile in the three schemes is obtained.(3)Using ANSYS/LS-DYNA analysis software to analyze collision motion between single pellets and three pieces of aluminum alloy plates at different speeds.Using LS-PrePost to post-process the collision model after analysis,the equivalent displacement cloud chart and equivalent stress cloud chart are obtained when the maximum collision force is generated at three speeds.It is known from the analysis of the collision equivalent displacement cloud map,in the three optimization scheme,the maximum deformation position of the aluminum alloy plate appears on the center of the colliding contact surface between the pellet and the aluminum alloy plate,the maximum displacement of aluminum alloy plate after collision is obtained;It is known from the analysis of the collision equivalent stress cloud map,the maximum stress position of the aluminum alloy plate appears at the center of the collision between the pellet and the aluminum alloy plate,the maximum stress value of the aluminum alloy plate after the collision is obtained,the maximum stress values of the three schemes are far less than the yield strength of aluminum alloy plates.It verifies that the collision between the pellets and the parts to be cleaned and not embedded and penetrating will destroy the surface structure of the parts to be cleaned.At the same time,taking into account the strengthening effect of cleaning parts,the curved straight curved blade is selected as the optimal scheme.(4)Through the production site test,we use the optimized impeller head device to clean the single sample,the shot blasting time needed to achieve the CSa3 derusting grade is obtained,the optimized scheme can meet the actual needs of factories.