As far as the jaw crusher is concerned, although the structure type is different, their working principle is basically the same, but the movement trajectory of the moving jaw is different. Generally speaking, when the movable jaw plate periodically reciprocates the fixed jaw plate around the suspension axis, sometimes approaching and sometimes leaving, when the movable jaw plate is close to the fixed jaw plate, the ore between the two jaw plates is crushed by the combined action of crushing, splitting and bending and breaking; When the movable jaw plate leaves the fixed jaw plate, the crushed ore is discharged through the discharge port of the crusher under the action of gravity.
The principle of single pendulum jaw type
The moving jaw is suspended on the mandrel and can be oscillated from side to side. When the eccentric shaft rotates, the connecting rod does reciprocating motion up and down, and drives the two thrust plates to also reciprocate, so as to promote the moving jaw to do left and right reciprocating motion to achieve crushing and unloading. This kind of crusher adopts a crank double-link mechanism, although the moving jaw is subjected to a great crushing reaction, and its eccentric shaft and connecting rod are not subjected to much force, so it is mostly made into large and medium-sized machines in the industry to crush hard materials. In addition, when this crusher is working, the movement trajectory of each point on the moving jaw is an arc centered on the mandrel, and the radius of the arc is equal to the distance from the point to the axis, the upper arc is small, the lower arc is large, the crushing efficiency is low, and the crushing ratio is generally 3-6. Due to the simple movement trajectory, it is called simple swing jaw crusher.
The simple pendulum jaw crusher has a compact and simple structure, and the transmission parts such as eccentric shafts are less stressed; Due to the small vertical displacement of the moving jaw, the material is less over-broken during processing, and the wear of the moving jaw plate is smaller.
The principle of compound pendulum jaw type
The upper end of the moving jaw is directly suspended on the eccentric shaft, and the connecting rod of the crank connecting rod mechanism is directly driven by the eccentricity of the eccentric shaft, and the lower end of the moving jaw is hinged with the thrust plate to support the rear wall of the frame. When the eccentric axis rotates, the trajectory of each point on the moving jaw is from the circumferential line of the suspension point (the radius is equal to the eccentricity), and gradually turns downward into an ellipse, and the lower the part, the more the elliptical is deviated, until the lower part is connected with the thrust plate The trajectory is an arc. Because the movement trajectory of each point on the moving jaw in this kind of machinery is relatively complex, it is called a complex swinging jaw crusher.
Compared with the simple pendulum type, the advantages of the double pendulum jaw crusher are: the weight is lighter, the components are fewer, the structure is more compact, the filling degree in the crushing cavity is better, the material block is evenly crushed, and the lower end of the moving jaw is forced to push out the finished product discharge, so the productivity is higher, and the productivity is 20-30% higher than that of the simple pendulum jaw crusher of the same specification; The material block has a large up-and-down tumbling motion in the lower part of the moving jaw, and is easy to be discharged in the shape of a cube.
