Optimization And Testing On The Indoors Of A New Feed Hammer Mill

Hammer type crusher has changed the traditional screening model to achieve the single cycle, for big particles easily plug mesh screen, hard material circulation layer forms, serious wear of screen mesh, etc. Has been effectively resolved, this thesis mainly is to smash the ministry of interior rotor group of redesign and respectively before and after the changing structure of rotor group unidirectional air flow and gas solid two phase flow was simulated.First, this paper tells the story of the significance of the thesis and the research background, for the development of feed mill at home and abroad in detail, this paper analyzes the working principle of hammer of feed mill, crusher for main low separation efficiency of several main factors in detail, analyzes the subject on the basis of forefathers’ research, finally, selected their research direction.Second, the mill for the single phase flow simulation. Comparison of single-phase flow and two-way flow simulation results of crushing chamber,(MRF) is a method of calculating the constant, time UDF is as variable dynamic grid computing mode, which USES MRF calculation stability, speed is superior to the UDF is used to calculate the result of dynamic grid UDF is a custom function, the calculation result is close to reality, but in the operation time on9-10times that of MRF.Once again, to improve the group were analyzed before and after the hammer. According to simulation results before and after the improvement of the hammer material crushing force and speed increased, and is bigger than the speed of material at the end of the floor is not the speed of the ribbed plate, improves the tangential velocity, the hammer when contact with the material of the tangential velocity increase, reduce energy consumption, improve production material. Circulation layer is the root cause of the emergence of a material is invalid hit too much, hammer is most of the material as the opening of synthetic linear velocity of rotation, circulation layer decreased significantly after ribbed plate, improves the material and hammer broken between force and the breakage force between material and material. Finally, the processing group, the simulation of the hammer mill for the experimental study. Analysis of material motion situation, to verify the accuracy of the mathematical model and numerical simulation. And feed to feed rate and rotational speed as two factors, measure the different feed feed rate and rotational speed grinding indoor material crushing rate, in unit time out shoes as standard comparison, crushing rate compared to two kinds of circumstances.