When the mine stone production line is running, the jaw crusher sometimes has the phenomenon of returning material, and the reasons are summarized as follows:
1. Problems with the equipment itself.
If the dimensions of some parts of the jaw crusher, such as jaw plates, toggle plates, etc., do not match the drawings, this will lead to deterioration of mechanical properties. Long-term use of such a machine will cause the angle between the two jaw plates to be more than twice the friction angle. When this happens, the friction between the material and the jaw plate is reduced, resulting in the inability to overcome the upward component of the crushing force. This allows the material to be extruded by a vertically upward force and slide towards the inlet. In short, the non-standard size of the parts leads to the fact that the material cannot get sufficient friction during the crushing process, which affects the crushing effect and the quality of the discharge.
2. The crushed material is unevenly stressed.
Under the action of the upward and downward movement of the movable jaw plate, the force of the material to be crushed in the crushing cavity is prone to imbalance in the vertical direction. Specifically, due to the upward force component, the material in the crushing chamber is prone to the phenomenon of upward moving back. This phenomenon can lead to a decrease in crushing efficiency, and measures need to be taken to balance the forces in the vertical direction in order to optimize the crushing effect.
3. The width of the discharge port is too large.
Many outsiders believe that the wider the discharge port of the jaw crusher, the better, in fact, the jaw crusher of the same specification, the larger the width of the discharge port, the more likely it is to return to the material. During the crushing process, the material is in direct contact with the jaw plate, resulting in friction. The more the jaw plate is worn, the more likely it is that there will be a return material.
4. The size difference of the material to be broken is large.
Generally speaking, the feed size of the jaw crusher is about the same, so as to ensure uniform blanking, and when the size of the material to be broken is very different, it is easy to return the material.