近年来,随着国民经济的发展,各行业对带式输送机提出了一系列新的技术要求:不仅要求输送距离长、运量大和速度高,而且还要求它能适用于向下运输。此外,为使多台带式输送机组成一条长距离的物料输送系统,需对各台输送机进行集中操纵。在这些新要求情况下,长距离大型带式输送机必须装设各种电气 In recent years, along with the development of the national economy, various industries have proposed a series of new technical requirements for belt conveyors: not only the requirement of long conveying distance, large volume and high speed, but also its applicability for downward transportation. In addition, to make multiple belt conveyors form a long-distance material handling system, each conveyor needs to be centrally controlled. In these new requirements, large-scale long-distance belt conveyors must be equipped with a variety of electrical