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1、翻 译原文Motorized Pulleys Solve Harsh Environmental Problemsat North American Ship Loading TerminalsKeywords: Motorized Pulleys, Ship Loaders, Bucket Wheel Stacker Reclaimers, Conveyor Belts1 AbstractThis paper presents design and operational challenges faced by three different ship loading facility op
2、erators, 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
3、 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 am
4、bient conditions, material handled, or compact equipment design make exposed drives difficult to integrate and operate.2 IntroductionWhat 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, ow
5、ned and operated by a railroad company. Each is located on water north of 45N latitude, where winter temperatures can drop to 40 F (-40C) and humidity reach nearly 100%. And each handles abrasive and/or corrosive material. One other important feature is common to these facilities.the Rulmeca Motoriz
6、ed Pulley. Rulmecas 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 facilitys layout, throughput, and particular challenges and it will explain why designers selected Mo
7、torized Pulley technology. These successful applications will help explain the growth in acceptance of Motorized Pulley technology in North America, especially in harsh environments.3 Motorized Pulley TechnologyThe Motorized Pulley concept was developed in the 1950s to provide a reliable means of dr
8、iving belt conveyors. Equipment designers quickly discovered that enclosing the drives motor and gearbox within a hermetically-sealed and oil-filled pulley shell not only made the drive compact, it also greatly improved the drives reliability and service life.Fig. 1: Rulmeca Motorized Pulley enclose
9、s motor and gearbox within hermetically-sealed oil-filled shell to protect moving components from harsh environment while saving space.Compactness, reliability, long service life, and limited maintenance requirements made the Motorized Pulley a popular conveyor drive for bulk handling equipment desi
10、gners in Europe. Large machinery such as bucket wheel reclaimers, ship loaders, and tunnel boring equipment soon had Motorized Pulleys installed as original equipment. And plant operators began replacing worn exposed conveyor drives with Motorized Pulleys at facilities handling materials such as fer
11、tilizer, sand & gravel, steel, ore, and wood products.Each Motorized Pulley consists of an AC squirrel-cage induction motor, directly coupled to a helical/spur gearbox,mounted on a fixed(non-rotating) shaft, and hermeticallysealed within the cylindrical pulley shell.Todays Motorized Pulley incorpora
12、tes a wide array of powers and speeds as well as optional features ,such as built-in mechanical backstops, anti-condensation heaters, and electro-mechanical brakes.4 Allouez Dock #54.1 Synopsis of UpgradeBurlington Northern Santa Fe Railroad(BNSF) recently completed the overhaul of two of three 40 y
13、ear old crawler-mounted bucket wheel reclaimers at the companys rail-toship transfer terminal for taconite pellets located near Superior, Wisconsin.4.2 Objective of UpgradeThe objective of the upgrade was to reduce high maintenance expense while improving system reliability in the stockpile area. Th
14、e upgrade included structural changes, replacement of on-board diesel engines, and the installation of RulmecaMotorized Pulleys. The challenge for BNSF operations was to keep the 40 year old machines working efficiently in spite of the fact that the machines manufacturerhad gone out of business more
15、 than 20 years ago. The original conveyor drives were a unique combination of components including AC motors, planetary gearboxes and pulleys mounted between the carrying and return strands of belt. Since original equipment manufacturers parts were no longer available and since the conveyor drives w
16、ere non-standard, BNSF was forced to custom-build parts, an expensiveand time-consuming process. Engineering Design Services recommended Rulmeca Motorized Pulleys because: (1) they are compact and would fit within the reclaimers structure, (2) Rulmeca Motorized Pulleys and replacement parts are readily available, and (3) Rulmeca has a long successful track record of supplying conveyor drives for bucket wheel reclaimers.
