关键词: 废菌棒, 粉碎分离机, 离散元, 绞龙

Abstract: In order to change the low efficiency mode of manual bag removal and mechanical crushing of waste bacteria rods, a small crushing separator integrating bag removal and crushing was designed. The debag device and the crushing device were designed, and the force of the auger on the waste bacteria rod during the crushing process was analyzed, based on the discrete element software EDEM, the binding model of the waste rod was established, and the grinding process was simulated. Through the design of orthogonal test, the influence of the parameters of the auger on the grinding degree of the waste rods was obtained and the prediction model was established. Through response surface analysis and prediction model, the parameters affecting the grinding degree of waste bacteria rods were optimized. The best working parameters were obtained as follows: the rotating speed of the grinding shaft was 323.4r/min, the outer diameter of the auger was 261.185mm, and the thickness of the blade was 6mm. The model predicted that the grinding degree of waste bacteria rods was 81.739%. The best working parameters were substituted into the simulation test, and the relative error between the predicted value of the model and the simulated value was 1.79%, which verified the availability of the prediction model. The prototype was manufactured with the outer diameter of the auger of 260mm and the thickness of the blade of 6mm, and the crushing test was carried out. The results showed that when the rotation speed of the auger was 320r/min, the working performance of the whole machine was stable, the feed of the waste bacteria rod was smooth, the crushing qualification rate was 92%, and the bacteria bag removal rate was 93%, which met the design requirements of the waste bacteria rod crushing separator.

Key words: waste bacteria stick, crushing separator, discrete element, wringing dragon