Basic structure of roller press
As we know, a roller press mainly consists of a pair of rollers with parallel axes. The rollers of the roller press are installed in the frame through bearing seats at both ends of the roller shaft. One roller is fixed relative to the frame, which is called a fixed roller, and the bearing seat of the other roller can reciprocate horizontally along the slider in the frame, which is called a moving roller. When working, the two rollers rotate oppositely in the middle, and the pressure exerted by the hydraulic system is transmitted to the material through the bearing seat of the moving roller and pushed to the fixed roller. The mechanical limit keeps a certain gap between the two rollers. At this time, the pressure is transmitted to the frame through the mechanical limit. As the material is fed between the two rolls, the material is bitten and the two rolls are stretched. At this time, the pressure exerted by the hydraulic system is transmitted to the material through the moving roller, and then transmitted to the frame through the fixed roller, the fixed roller bearing seat, the positioning pin and the frame. In this process, the material is crushed by the action and reaction force generated between the two drums. Due to the rotation of the two rollers, the material is continuously bitten and forced to discharge, thus realizing continuous crushing operation.
The working principle of the roller press
The roller press is designed according to the principle of material bed crushing. Material bed crushing is different from single particle crushing. Single particle crushing is the crushing in which the external force directly acts on the single particle layer to form destructive stress; in the process of material bed crushing, the crushed particles gather together to form a particle bed. Each particle is bounded by neighboring particles. The external force acts on the particle layer, and the number of particles in direct contact is small. The stress transfer mainly depends on the particle itself. Particle interactions create cracks, fractures and splits. Experiments show that this pulverization method can significantly save energy. Roller presses and vertical mills with material bed crushing mechanisms have been widely used in practice and have achieved good results.
