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翻 译 原文 Motorized Pulleys Solve Harsh Environmental Problems at North American Ship Loading Terminals Keywords: Motorized Pulleys, Ship Loaders, Bucket Wheel Stacker Reclaimers, Conveyor Belts 1 Abstract This paper presents design and operational challenges faced by three different ship loading facility operators, one handling export coal on the Gulf of Alaska and two handling taconite iron ore pellets on the North American Great Lakes. Extreme temperatures and abrasive materials, coupled with a need for compactness, made internally-powered and hermetically-sealed Motorized Pulleys the optimal design choice for driving ship loader and bucket wheel reclaimer conveyor belts. Originally a European idea, the Motorized Pulley was slow in gaining acceptance in North America in the twentieth century.However, the internally-powered conveyor belt drive has recently become more popular,especially where ambient conditions, material handled, or compact equipment design make exposed drives difficult to integrate and operate. 2 Introduction What do Seward, Alaska; Superior, Wisconsin; and Escanaba, Michigan have in common? Each is the location of a major rail-to-ship bulk storage and transfer facility, owned and operated by a railroad company. Each is located on water north of 45oN latitude, where winter temperatures can drop to –40o F (-40oC) and humidity reach nearly 100%. And each handles abrasive and/or corrosive material. One other important feature is common to these facilities...the Rulmeca Motorized Pulley. Rulmeca’s internally-powered and hermetically-sealed Motorized Pulley was selected to upgrade key drives on shiploader and bucket wheel reclaimer conveyor belts. This paper will review each facility’s layout, throughput, and particular challenges and it will explain why designers selected Motorized Pulley technology. These successful applications will help explain the growth in acceptance of Motorized Pulley technology in North America, especially in harsh envir