AG060914 Converting a screw feeder to a （AG060914转换一个螺旋加料器）.pdfVIP

APPLICATION GUIDE AG060914 Converting a screw feeder to a weighscrew Objective:  Learn how to refit a screw feeder for gravimetric conveying  Learn how to program a BW500 integrator for use with a weighscrew Equipment:  Screw conveyor  Load cells  BW500  Speed sensor While every effort was made to verify the following information, no warranty of accuracy or usability is expressed or implied. Overview A screw (or auger) conveyor is a mechanism that uses a rotating helical screw blade —called a flight—to move liquid, slurry or solid materials (usually within a tube). They are one of the most popular options for material transport, as the dust tight enclosure and compact design make them ideal for moving semi-solid materials such as food waste, wood chips, aggregates, cereal grains, animal feed, boiler ash, meat and bone meal, and municipal solid waste, for example. Most often used horizontally or on a steep incline, screw conveyors usually consist of a trough or tube containing one of the following types of spirals: 1. A blade coiled around a shaft that is driven at one end and held at the other. 2. A shaftless spiral that is driven at one end and free at the other. Volumetric versus Gravimetric Feeders Conveyors that are used to measure material flow are known as Volumetric type feeders. In this kind of application, the rate of volume transfer is proportional to the rotation rate of the shaft. As a result, such a device can act as a variable volumetric feeder by fluctuating the rotation rate of the shaft to deliver a predetermine