摘要：为了对立磨中轮胎型和锥型磨辊的粉磨过程进行分析比较,运用微分剪切理论建立轮胎型与锥型磨辊研磨物料的数学模型:通过建立磨辊-物料接触区域不同位置料层厚度的数学公式,得出料层微分单元受力的平衡方程;将方程积分得到磨辊与物料接触力及接触面积的大小。通过计算,得出在研磨过程不同参数(料层厚度、工作压力以及磨辊偏角)与接触面积之间的关系,并对2种磨辊进行比较分析。结果表明:磨辊偏转角度越大,磨辊所受应力峰值越大;在相同工作条件下,轮胎辊与物料有更大的接触面积,较小的应力峰值。

关键词：微分剪切理论；立磨；轮胎辊；锥辊；力学分析

Abstract：In order to make a comparison between the tyre and cone shaped grinding roller's grinding process in vertical roller mill(VRM), the mathematical model of the tyre and cone shaped grinding roller based on the differential shear theory was built. The functional expression of the materials' thickness in different contact zone was also built. The equilibrium equation of the materials' differential unit and the contact force and contact area of the grinding roller by integral were obtained. By calculation,the relation between different grinding parameters(the thickness of the materials, the working force and the deflection angle of the grinding roller and the contact area were obtained, then the two kinds of grinding rollers were compared. The result shows that with the bigger deflation angle, the greater peak stress the grinding roller suffers. Under the same working condition, the tyre shaped grinding roller has bigger contact area and smaller peak stress.

Keywords: differential shear theory；vertical roller mill；tyre shaped grinding roller；cone shaped grinding roller； mechanics analysis