Sand making equipment research department in Zhengzhou Dingsheng Engineering Technology Co., Ltd put forward a kind of environmental protection production process that combined crushing and shaping, also facilitate wet process turns to dry process or semidry process. The productive technology has the features of large crushing ratio, adjust fines modulus, even and continuous graduation, high sand making ratio, finally realize low investment, low operating costs, significant economic and social benefits.

With the rapid development of hydropower, the aggregate demand for manual sand stone is growing. While the hydropower project is a very high-tech construction project, so the demand of manual sand stone is very high. According to the situation, Liming took security, quality and engineering and other factors into consideration, setting target of advanced artificial sand making production line, and with long-term efforts.

Nowadays, Liming has researched and developed its own sand making production line. This production line is composed of feeder machine, jaw crusher, counter-attack crusher, “Stone strike stone” sand making machine, vibrating screen, sand washer, belt conveyor, centralized electric control and so on. In order to meet the different needs of customer, it can be equipped with a complete set of cone crusher, the dust removal equipment and so on. The production line can be used in many kinds of materials like limestone, granite, basalt, river stone, cobblestone, the gangue and manual sand making work. It is applied to the water and electricity, building, building materials, highway, urban construction.

The material (limestone, granite, basalt, gneiss, river stone, and cobblestone) will be fed into the jaw crusher to be crushed preliminarily. The material after be thickly crushed preliminarily will be transported to the counter-attack crusher to be crushed further by the belt conveyor. The stone material after be crushed twice will be transported to “Stone strike stone” sand making machine to be crushed once more. The crushed stone material will be screened out the different specification by the vibrating screen through the belt conveyor. The qualified finished product will be transported to the finished product storehouse by the belt conveyor and the unqualified stone returns to the “Stone strike stone” sand making machine through the belt conveyer to be crushed once more. It can form the close circulated crushing.

Large materials are fed into the jaw crusher evenly and gradually by vibrating feeder through a hopper for primary crushing. Then they are lift to storage room by elevator. Then the materials will be transferred to grinding chamber. After being grinded, the powder will be blowed to cyclone by blower. Then the material will be transferred to storage room through pipes, and then will be discharged as final products. The whole process works in a negative pressure environment, which ensures high productivity. In addition, the dust under the main unit will be transferred to dust clean equipment through pipes to protect the environment.