In terms of use, China uses more two-roller crushers . Figure 1 shows the construction of a two-roller crusher. The crusher has a relatively simple structure, and is mainly composed of a frame, a transmission device, a crushing roller, an adjusting device, and a spring safety device.
Rack 1 Rack roll crusher is generally cast with cast iron, steel may also be welded or bolted together. Regardless of the method of manufacture, the frame is required to be strong and sturdy.
2. Two parallel rotating rollers on the horizontal axis of the crushing roller parallel device are the crushing rollers. It is the working mechanism of the crusher. The bearing of one of the rollers is movable and the bearing of the other roller is fixed. The crushing roller is composed of a roller surface, a shaft, a tapered arc iron, and a main shaft. The shaft is connected to the main shaft by a key, and the outer surface is tapered to fit the tapered hole of the roller surface. The roll surface with high-manganese steel or other wear-resistant material, the use of three tapered arc iron, tightening bolts and nuts and other parts are secured together with the shaft Yi, which fixing method shown in Figure 2.
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3. Transmission The two rollers of the crusher are respectively driven by a motor through the pulley and rotated in opposite directions. As the moving bearing moves, the tension of the pulley will fluctuate accordingly. Therefore, the motor is often placed under the movable bearing so that the moving bearing moves in a direction perpendicular to the direction of the pulley and the motor center connection, and the belt can be reduced. Fluctuations in tension.
4. Adjustment device The size of the gap between the two crushing rolls of the crusher, that is, the size of the discharge opening, is achieved by increasing or decreasing the number of gaskets between the two crushing roller bearings. The movable bearing 2 is urged to the left fixed bearing by the pressure of the spring 5. Under normal conditions, the spring force is sufficient to overcome the crushing force required by the ore. For different ores, the nut on the spring cover can be used to adjust the spring force to meet different crushing requirements.
5. When the spring safety device is working, the crushing force generated between the crushing rollers is balanced by the tension of the spring 5. Moreover, when the crusher is overloaded, the crushing force is sharply increased, and the spring is compressed, forcing the movable bearing to move laterally, the width of the discharge opening becomes large, and the non-crushed material can be discharged. When the non-crushed material is discharged, the movable bearing is restored to its original state by the spring force, and the crusher can continue to work. Hydraulic method can also be used to make the crushing roller automatically retreat, increase the roller gap, let the non-crushed objects fall, and then resume normal operation.
It can be seen that the tightness of the spring is extremely important for the normal operation and overload protection of the crusher. In addition, during operation, the spring is always in a vibrating state, and it is easy to cause fatigue damage. Therefore, it must be inspected frequently and replaced regularly to ensure the normal operation of the crusher.
The single-roller crusher is simpler than the double-roller crusher. It is a movable toothed plate instead of the movable crushing roller in the double-roller crusher. Its working principle, the adjustment principle of the discharge opening and the safety device are both The roller crusher is similar.

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