Jaw crusher is the most commonly used coarse crushing equipment in ore crushing operations. It has a large feed opening and high crushing capacity. It is mainly used to process various hard ores and handles a wide variety of materials. It can be used to crush various larger block materials in mining, building materials, highways, railways, water conservancy, chemical industry and other industries. The compressive strength does not exceed 320Mpa. There are many types of jaw crushers. Simply speaking, they can be divided into simple swing jaw crushers, compound swing jaw crushers, and double-chamber jaw crushers.
1. Simple swing jaw crusher
The simple swing jaw crusher is mainly composed of fixed jaw, movable jaw, toggle plate, flywheel, eccentric shaft and other components.
The top of the movable jaw body of the simple swing jaw crusher is installed in the suspension shaft and swings back and forth around the suspension shaft. The simple movement trajectory of the movable jaw of the simple swing jaw crusher is simple and can produce large crushing force. It is suitable for crushing large pieces of hard and difficult-to-break materials. Since the movable jaw body only makes simple swings and the main stroke is used for crushing, the wear and tear of the lining plate will have little impact on the crushed products, and maintenance is relatively easy. The disadvantages are the weight, volume and high cost of the whole machine.
2. Compound pendulum jaw crusher
Different from the simple swing jaw crusher, the compound swing jaw crusher combines the movable jaw body and the connecting rod into a whole, the eccentric shaft also serves as the suspension shaft of the movable jaw body, and the toggle plate is also simplified from two to one.
According to the mutual positional relationship between the eccentric shaft of the movable jaw body and the height of the feed inlet, the compound swing jaw crusher can be divided into positive suspension, zero suspension and negative suspension; according to the different support methods of the toggle plate at the lower end of the movable jaw body, the compound swing jaw crusher Crusher can be divided into positive support, zero support and negative support. Adjusting the suspension and support methods can effectively change the equipment processing capacity, power consumption, liner wear and movable jaw stroke, and obtain the best working characteristics through optimized design. Under the same conditions as the simple swing jaw crusher, the production capacity of this crusher is 20% – 30% higher than that of the simple swing jaw crusher.
3. Double chamber jaw crusher
Double-chamber jaw crushers are divided into simple-pendulum double-chamber jaw crushers and compound-pendulum double-chamber jaw crushers, which were first developed by East Germany and the United States respectively. The characteristic of the compound-pendulum double-chamber jaw crusher is that the eccentric shaft device is arranged at the lower part of the crusher, and the movable jaw mechanism is divided into two working surfaces on the left and right, which form two independent crushing chambers with the oppositely arranged fixed jaw. As the eccentric shaft rotates, the left and right crushing chambers alternately complete the material crushing task. That is, at any time when the movable jaw swings, there is a movement process of the crushing stroke and the discharge stroke.
With its unique structure, the double-chamber jaw crusher decomposes the crushing stroke and discharge stroke of the compound pendulum jaw crusher into two crushing strokes and two discharge strokes in each working cycle. Through kinematic analysis and mechanism Optimizing the design can obtain a more ideal movement trajectory of the movable jaw. However, the structure of the equipment is complex and the maintenance workload is relatively large. In addition, the output and energy consumption utilization still need to be improved.
