带式输送机外文翻译---煤矿输送带软启动机制的比较.doc

文档下载 亿万文档 免费下载 论文研究生考试资格考试IT计算机高等教育教学研究经管营销总结/汇报工作范文行业资料考试资料学术论文 当前位置：文档下载 带式输送机外文翻译---煤矿输送带软启动机制的比较 免费下载此文档 带式输送机外文翻译---煤矿输送带软启动机制的比较 附 录 英文文献 A Comparison of Soft Start Mechanisms for Mining Belt Conveyors Michael L. Nave, P.E. CONSOL Inc. 1800 Washington RoadPittsburgh, PA15241 Belt Conveyors are an important method for transportation of bulk materials in the mining industry. The control of the application of the starting torque from the belt drive system to the belt fabric affects the performance, life cost, and reliability of the conveyor. This paper examines applications of each starting method within the coal mining industry. INTRODUCTION The drive pulley via friction between the drive pulley and the belt fabric must transmit the force required to move a belt conveyor. In order to transmit power there must be a difference in the belt tension as it approaches and leaves the drive pulley. These conditions are true for steady state running, starting, and stopping. Traditionally, belt designs are based on static calculations of running forces. Since starting and stopping are not examined in detail, safety factors are applied to static loadings (Harrison, 1987). This paper will primarily address the starting or acceleration duty of the conveyor. The belt designer must control starting acceleration to prevent excessive tension in the belt fabric and forces in the belt drive system (Surtees, 1986). High acceleration forces can adversely affect the belt fabric, belt splices, drive pulleys, idler pulleys, shafts, bearings, speed reducers, and couplings. Uncontrolled acceleration forces can cause belt conveyor system performance problems with vertical curves, excessive belt take-up movement, loss of drive pulley friction, spillage of materials, and festooning of the belt fabric. The belt designer Is confronted with two problems, The belt drive system must produce a minimum torque powerful enough to start the conveyor, and controlled such that the acceleration forces