水垫带式输送机水膜承载能力的有限元分析

Finite Element Analysis on Water Load-bearing Capacity of Water Cushion Belt Conveyor

研究了喷嘴直径、分布形式等设计参数对水垫带式输送机承载能力的影响。将水垫带式输送机的水膜承载问题简化为以雷诺方程表示的二维流体润滑问题,运用有限元法和适当的边界条件,计算得出了不同设计参数情况下的水膜承载能力,并对计算结果进行了分析比较。结果表明:喷嘴直径一定时,承载量随供水压力的升高而增大,随水垫厚度h的增大而降低;供水压力一定时,承载量随喷嘴直径的增加而增大,随水垫厚度的增大而下降;喷嘴直径和供水压力一定时,当喷嘴排数增加时,压力分布曲线向外凸起,而当喷嘴排数减少时,压力分布曲线向内收缩,由于此压力分布曲线应与载荷分布曲线相一致,因此喷嘴的排数应按物料在传送带上不同的堆积形式作出相应的选择。

The design parameters include diameter and distribution of the muzzles effect on the load capacity of water cushion belt conveyor were investigated theoretically. The load capacity problem of the conveyor was simplified to a two-dimensional fluid lubrication problem expressed with Reynolds equation. By means of finite element method and appropriate boundary conditions, the load capacities of the conveyor with the different design parameters were computed, and numerical results were analyzed and compared. The result shows that when the diameter of muzzles is fixed, the load capacity increases with the water pressure, and decreases with water cushion thickness. When the water pressure is fixed, the load capacity increases with the diameter of muzzles, and decreases with the water cushion thickness. If both the diameter of muzzles and the water pressure are fixed, the pressure distributing curve will be convexed outside, when the muzzles lines amount increases;the pressure distributing curve will shrink inside ,when the muzzles lines amount decreases. The pressure distributing curve should be consonant with the load distribution curve. Therefore, the muzzles lines amount should be chosen according to the deposit shape of the materiel on the belt.