Principle And Experimental Study On Chaotic Vibration Mill

Grinding equipment had long been an indispensible processing equipment that widely used in industry, agriculture and high and new technology industries. Material that scale from several meters can be processing into very small size ranging from micron to millimeter, even in semi-micros by using grinding equipment. However, with the development of modern industry and agriculture, power consumption become very large in the process of grinding materials. Ten to twelve percent of the world’s power was consumed by crushing and grinding process. And fifty percent, even seventy percent of funds in the initial investment of grinding industry was used to purchase complete sets of grinding equipment. Therefore, technology updating and cost reduction in grinding industry has become paramount, and it was very difficult to break the status quo of grinding technology because of the fact that the development in this field has long been remained in reform and dimension addition to pre-existing technologies both domestic and overseas.A chaotic vibration mill design has been provide in this thesis by replace the vibration source of the conventional vibration mill. The fact that vibration strength is the main influence factors of grinding efficiency has been discovered through research on principles of grinding. However, it is difficult for conventional vibration mill to achieve a relatively high production efficiency because of its small amplitude, single vibration frequency and the existent of low-energy zone. Nevertheless, the vibration frequency of vibrating object can be increased based on main vibration frequency by chaotic vibration which excited by chaos exciter in chaotic vibration mill. Therefore, the magnitude of grinding impact force and the chance of frictional shear between material and medium can be increased by this wide range vibration frequency which forced the motion of material and grinding medium became violent and random, in the meantime, eliminated the possibility of the existent of low-energy zone. This thesis first analyses the principle of material grinding, finding out the main influence factors of grinding efficiency. An optimization design has been presented by analyzing the cause of negative factors. Secondly, the mathematical model of the conventional vibration mill and the chaotic vibration mill has been built by using Lagrange equation and the motion curve simulation has been done in software Matlab. The conclusion that chaotic vibration mill can provide a chaotic vibration during process and the vibration strength is greater than the conventional vibration mill can provide has been drawn by analyzing simulating result. Moreover, a model of vibrating object on chaotic vibration mill has been built by using3D modeling software, and then, an end-face chaos exciter design has been proposed according to the combination of3D model and KAM theorem. With the accomplish of selection of other vibration components, the dynamics simulation on modified vibrating object has been done by software Adams. The simulating result proved that the motion Curve of vibrating object on chaotic vibration mill was random, irregular and near circular within limited, the speed of vibration crushing was faster and the production efficiency was relatively high.The research indicates that the production efficiency and the precision of pellet of chaotic vibration mill was higher than the conventional vibration mill, its power consumption was lower and particle size was well-distributed because of low-energy zone was no longer existed. The chaotic vibration mill can be an effective solution to current difficulties of grinding industry.