The Nonlinear Dynamics Analysis Of The Crushing Process Of The Vibrating Roller Crusher

Crushing and grinding is the main way for many fields to make use of the natural resources, such as metallurgy, mine, building, the chemical industry and the making medicine industry. But it consumes so much energy that 15% of the electric power is spent on it .Statistics has shown that, crushing process reduces the size of materials in the ratio of 50 by using 10 percent of total energy consumption, however, grinding process reduces the size of materials in the ratio of 200 by using 90 percent of total energy consumption .Therefore, ' more crushing less grinding' is naturally the best choice for the crushing and grinding process so that to take the advantage of the crushing process .Experiments have also confirmed that, the size of the crushing product will be reduced 10 times after superfine crushing, at the same time the reduction ratio of the grinding will be decreased 10, as a result, the specific energy consumption of the whole crushing and grinding circle will decrease over 10 percent, and the output of it will increase 30 percent .Obviously, development of superfine crushing machinery is the key to reach this goal.The vibratory crusher is one of the ideal machinery to perform superfine crushing, because it can exert high frequency impact force to the bulk solids when they flow through the crushing chamber formed by two rigid bodies in relative vibrating. However, while the rigid bodies impact onto the bulk solids, they will receive the same anti-force from the bulk solids, and so that it becomes to be a specially vibro-impact system with strongly nonlinear coupling between multi-degree-of-freedom .How to control and take advantage of the coupling impact is the key to carry on the dynamical design of the vibratory crusher, but remained to be investigated till now.The inherent stress-displacement relationship of the bulk solids during pressing and releasing was first studied in this paper by the pressing the particle bed confined in a cylinder vessel to the point of wholly broken. A vibro-impact crushing system with one-degree-of-freedom was then set up in our lab. The nonlinear dynamics response of it was investigated by numerical simulation method, and the varying rules of the impact between the rigid bodies and the bulk solids with the clearance and the parameters of the bulk solids was obtained. The dynamical model with 6- degree-of-freedom of the vibratory crusher with vibrating roller were derived, and the dynamics of this system has been analyzed, and the orbits of the jaws have been simulated by solving these equations. Finally, crushing tests were performed for the vibratory crusher, which testified the nonsymmetric vibro-impact in the two crushing chamber by the numerical simulation method.