There are 8 or 10 cyclones distributed symmetrically with characteristics of compact structure, small volume and convenient maintenance &operation in the ZCN series silt remover, one of main drilling fluid solid control equipments, which can eliminate more than 60% hazardous solid materials in the range of 15-47μm, enhance the property of drilling fluid. ZCN series is applicable to various types of drilling rig and circulating system of drilling fluid.