Vibrating cone crusher is one of the energy-saving equipment with super-fine fragmentation. The materials layers between the moveless cone and movable cone is impacted and crushed by the relative motion and at the same time the materials layers have counterforce on the cones. The coupling between rigid body and the bulk has great effect on the fragmentation. The model of vibrating cone crusher is simplified as six degrees of freedom only considering the movable cone motion. The dynamics equations are built with the materials layers as piecewise linear contract force model using Lagrange equation and simulation is conducted by Matlab. The result indicates that the materials layers are the main source of the nonlinear system. The materials layers make the system have complex motion instead of harmonic motion with single frequency. It can provide references to choose parameters of the vibrating cone crusher.