The type, specification and quantity of the equipment used for the sand production line should meet the quality and quantity requirements of the product. If there are a variety of sand making machine that meet the requirements, it should be determined through technical and economic comparison. For the equipment selected for the upper and lower processes, the load should be balanced. The type and specifications of the same working equipment should be as uniform as possible. Large sand and gravel processing plants should use large-scale equipment that is suitable for the production scale, but the number of equipment for the same operation should not be less than two. The selection of the main sand making machine can generally consider the appropriate load factor, and should not consider the standby of the whole machine. When one of the following conditions is met, the equipment should be considered for standby. 1) The artificial sandstone material has high compressive strength, high hardness and strong abrasiveness. 2) Select the impact sand making machine as the medium and fine crushing equipment. 3) The number of the same operating equipment exceeds three. The selection of crushing equipment should consider the adaptability of the equipment to the lithology of the raw materials and meet the requirements of the particle size and quantity of the feedstock. The type of screening equipment should be compatible with the processing capacity required for screening aggregates, screening efficiency, operating conditions and equipment configuration requirements. The calculation of the processing capacity of the screening equipment should take into account the fluctuation of the feed amount. The processing capacity of the multi-layer sieve should be calculated according to the control sieve layer, and the thickness of the layer at the discharge end of the screening equipment should be checked. The type of sand making machine should be compatible with the physical properties of the sand making material, the required processing capacity, the fineness modulus of the sand, and the configuration requirements of the equipment. When selecting the medium-discharge type rod mill as the sand making equipment, the whole machine should be considered for standby, and the single processing capacity, sanding rate and rod grinding of the cobblestone sand making machine should be determined according to the industrial production test or the indoor test result. Number of machines. The belt conveyor conveys the sand material dewatered by the spiral classifier, and the upward allowable inclination angle should not exceed 12", the selected bandwidth should be increased by one level than the calculated value, and the minimum bandwidth should not be less than 650 mm.

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