碎石器是破碎坚硬岩石、混凝土等物料的机械,国外除广泛用于金属和非金属矿山的二次破碎外,还用于破碎旧基础、桥墩大块、路面以及清理炉衬等。近几年液压碎石器在国外发展较快,我国也已有几个单位研制液压碎石器。我校在研制地下矿山用液压碎石器的过程中,遇到了液压卡紧力的问题。现通过对液压碎石器中液压卡紧力的分析、计算和实验,说明在换向阀、缸体和活塞设计中,应充分注意这一问题,并采取措施以减小液压卡紧力。 1.碎石器中液压卡紧力的分析 在液压元件中,孔和轴的配合较多,如换向阀阀套与阀芯、缸体与柱塞的配合。由于加工、装配和使用中的原因,往往会出现 Stone crusher is broken hard rock, concrete and other materials machinery, abroad is widely used in metal and non-metallic mines secondary crushing, but also for crushing the old foundation, piers large blocks, pavement and cleaning lining and so on. Hydraulic gravel in recent years, the rapid development in foreign countries, our country has also developed a few units hydraulic lithotripsy. Our school in the development of underground mining hydraulic gravel in the process, encountered a hydraulic clamping force problem. Through the analysis, calculation and experiment of the hydraulic clamping force in the hydraulic stone crusher, it should be noted that in the design of the directional control valve, the cylinder block and the piston, this problem should be paid full attention to and measures should be taken to reduce the hydraulic clamping force. 1. Analysis of hydraulic clamping force in stone device In the hydraulic components, the hole and the shaft with more, such as the valve sleeve and valve spool, cylinder and plunger with. Due to processing, assembly and use of the reasons, often appear