Stones refer to those stone which can be used as industry materials, such as iron ore, nonferrous metal ore, granite, limestone, quartzite, sandstone, pebble, etc. There are three kinds of common stones: stones used in road building, aggregate of bridge building and stones used in architecture and sculpture design. Stones used in road building should be tidy and of high quality. Aggregate of bridge building should be flag, rock block, rubble ashlars and tapered rocks.
Stone crushing plant can be divided into rock crushing plant and sand making production line. Different classification leads to different equipment configuration for the production line. Rock crushing plant can be divided into one-time molding stone production line and secondary crushing stone production line according to the hardness of the crushing stone.Stone crushing plant is specially designed for this process.The machines used in the stone crushing plant include storage bin, vibrating screen, jaw crusher, impact crusher, circular vibrating screen and belt conveyor.
The stone crushing and screening plant working process:
1. Firstly, the big raw material will be put onto the vibrating feeder by the truck or excavator, then the materials will be put into the cavity of the jaw crusher evenly under the stable vibration of vibrating feeder.
2. In order to achieve the goal of seven small-sized final products of customers, we have to crush the materials which have been crushed by jaw crusher again. At this time, we prefer to choose impact crusher as secondary-stage crusher considering the hardness of the crushed stone (limestone). The impact crusher has been very popular among the customers because it has many advantages when crushing medium hard stone, like big capacity, high reduction ratio, uniform end product size and so on. Considering it is a crushing line of 150TPH, we intend to choose the model PF1315 impact crusher. The feed size for PF1315 can reach around 200mm, so it can crush the aggregates from the jaw crusher easily.
3. After the primary crushing of jaw crusher and further crushing of impact crusher, the size of the products can basically meet the demands of our customer, but how to classify them according to their sizes at this time, this is a question ahead of us. And now what we need is some particular screen which can sift these aggregates to different-sized piles, that is the vibrating screen with feature of multi-layer, reliable and stable structure, high screening efficiency. And we decide to choose the model 3YK2160 and 3YK1548 screen in view of the 150TPH capacity.
4. The materials from the impact crusher will be conveyed to the screen 3YK2160 first through belt conveyor, and three kinds of materials are screened out by it at this time (bigger size). Among that, the materials on the uppermost layer of 3YK2160 are then conveyed to 3YK1548 by belt conveyor and then another 4 kinds of materials are screened out finally (smaller size). And the whole working process is finished by now.
Basic process of the stone production line: Big size stones are transferred to primary crusher through Vibrating Feeder from hopper for first crushing, and then the crushed materials are transferred to Impact Crusher through Belt Conveyor for secondary crushing. The crushed materials will be transferred to the vibrating screen, and separated to different sizes. Those aggregate with suitable size will be transferred to the final product pile and those with unsuitable size will be transferred to the Impact Crusher for re-crushing. It forms a closed circuit manifold cycles. The sizes of final products will be graded and separated according to customers’ requirements, and the deduster will be attached for the sake of environment protection.