Crushing Process of Jaw Crusher

Theoretically a particle is crushed in side a crusher when it is compressed and fails in tensile stress. But in actual practice these particles also undergo slipping motion between the jaw plates . It is due to the vertical movement of the swinging during the working cycle. Sometimes the particles also exhibit rolling motion that depends on the the geometry of the fed material and the crushing zone. As the sliding motion between the jaw plates and the particle has considerable affect on the jaw plates wear, the consequences due to sliding motion is studied here.

Figure 1 Crushing Process of Jaw Crusher

The force acting on the element during the crushing process is shown in the Figure 1. As the horizontal and the vertical velocities of the moving jaw changes during the crushing process, the forces on the particle varies at different time. When the component of the vertical velocity in the moving jaw plate direction is bigger than that of the horizontal velocity in the same direction, the forces on the particle are shown in Figure 1. When the component of the vertical velocity in the jaw plate direction is smaller than that of the horizon velocity, the forces on the particle are shown in figure 1. The magnitude of gravitational force is much smaller than others, it can be ignored.