圆锥破碎机力学性能研究

发布时间：2018-11-12 07:14

【摘要】：随着采矿行业的不断发展和贫矿比例的越来越高,矿石的破碎量日益增大。在道路、桥梁、建筑等工业行业中,碎石物料也得到了越来越广泛的应用。圆锥破碎机是破碎过程的重要一环。就圆锥破碎机的设计而言,挤压破碎力是破碎机结构和强度设计的必要依据。首先,利用岩石破碎过程分析软件得到单颗粒物料在单轴压缩下的挤压力变化情况和破碎过程。再利用Hertz理论研究颗粒间的重叠量来分析层压破碎过程及其破碎力。分析了物料排布最不利于破碎的情况,提出了破碎机在该种情况下破碎时的压缩量和破碎力计算方法。将此状况下的破碎力作为圆锥破碎机设计过程中结构和强度的设计依据。在分析破碎机的其他受力时,也以此种情况下的破碎力值进行求解。其次,系统介绍了圆锥破碎机的主要参数,并将参数按照可控与否分类。分析了物料的物理力学性质、粒度分布、腔型、偏心套转速、压缩比、悬挂点高度等参数对破碎力的影响。在考虑颗粒尺寸及其变化的情况下详细研究了动锥公转转速对物料下落和破碎力的影响,提出了最佳偏心套转速的确定方法。再次,将主轴动锥部作为一个整体,分析主轴动锥部主要受力,得出了主轴公转的推动力是来自于偏心套。利用达朗贝尔原理,将惯性力作为虚拟的力,与其他外力和约束力一起建立了主轴动锥部受力的平衡方程,求解了无法通过分析得到的顶端关节轴承的约束力。最后,分析了因主轴动锥部的公转和偏心套的结构不对称引起的圆锥破碎机的不平衡,在分析了主轴动锥部和偏心套旋转产生的惯性力之后,提出了通过放置平衡块解决动不平衡的方案,并提出了平衡重的质量和放置方位的计算方法。
[Abstract]:With the development of mining industry and the increasing proportion of lean ore, ore breakage is increasing day by day. In the road, bridge, construction and other industrial industries, gravel materials have been more and more widely used. Cone crusher is an important part of crushing process. As far as the design of cone crusher is concerned, the crushing force is the necessary basis for the structure and strength design of the crusher. Firstly, the extrusion pressure and breakage process of single particle material under uniaxial compression are obtained by using rock breaking process analysis software. Hertz theory is used to study the overlap between particles to analyze the laminated fracture process and its crushing force. This paper analyses the situation that material arrangement is most unfavorable to crushing, and puts forward the calculation method of crushing capacity and crushing force of crusher in this case. The crushing force under this condition is used as the design basis of the structure and strength in the design process of the cone crusher. In the analysis of other forces on the crusher, the value of the crushing force in this case is also used to solve the problem. Secondly, the main parameters of cone crusher are introduced systematically, and the parameters are classified according to controllable or not. The effects of physical and mechanical properties, particle size distribution, cavity shape, rotation speed of eccentric sleeve, compression ratio and height of suspension point on the crushing force are analyzed. The influence of rotating speed of moving cone on material falling and breaking force is studied in detail considering the particle size and its variation. The method of determining the optimum rotation speed of eccentric sleeve is put forward. Thirdly, the main force of the spindle moving cone is analyzed as a whole, and the driving force of the spindle rotation is obtained from the eccentricity sleeve. By using the principle of Darembert, the inertia force is taken as the virtual force, and the balance equation of the force acting on the spindle's moving cone is established together with other external forces and binding forces, and the binding force of the top joint bearing, which cannot be obtained by analysis, is solved. Finally, the unbalance of the cone crusher caused by the rotation of the moving cone of the spindle and the asymmetry of the structure of the eccentric sleeve is analyzed, and the inertial force caused by the rotation of the moving cone and the eccentric sleeve of the spindle is analyzed. A scheme to solve the dynamic unbalance by placing a balance block is put forward, and the calculation method of the mass of the balance weight and the orientation of the placement is put forward.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD451

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