DESIGN AND EXPERIMENT OF LARGE STRAW CRUSHER WITH CYLINDER FEEDING HAMMER

In order to solve the problems of small feeding amount, high manual labor intensity and low work efficiency of the existing straw crusher, a large straw crusher with cylinder feeding hammer is designed. The key parts of the machine are designed and calculated, and the mechanism of corn straw crushing in the crusher is analyzed, and the theoretical factors affecting the working effect of the crusher are obtained. With the rotation speed of crushing shaft, diameter of sieve and clearance of sieve-hammer as test factors, and the productivity, qualification rate of crushing length as performance evaluation indicators, a quadratic regression orthogonal rotation combination test with three factors and five levels was carried out. The regression mathematical model of test factors and performance evaluation indicators was established by using Design-Expert 13.0 software. With the goal of simultaneously maximizing the qualified rate of productivity and crushing length, multi-objective optimization solutions were carried out for the rotation speed of crushing shaft, diameter of sieve and clearance of sieve-hammer, and the optimal parameter combination was determined as follows: The rotation speed of crushing shaft is 1709.24r/min, the diameter of sieve is 22.83mm, the clearance of sieve-hammer is 15.38mm, the verification test shows that the productivity is 9187.98kg/h, and the qualification rate of crushing length is 93.87%. The machine improves the efficiency of crushing operation and can meet the design requirements.