Efficiency studies of the effect of moisture on the power consumption of mine scrapers

Many years of practice have resulted in the standardization of several types of scrapers which are now commonly manufactured for use in mining. Although experience has brought out much information on scraping operations, no systematic studies of the efficiency of mine scrapers have been carried out before the experimental works done in the last few years at Missouri School of Mines and Metallurgy. Purpose of Problem : The purpose of this present study is to consider the effect which moisture in the muck has on the efficiency as regards power consumption and amount of material scraped, of different types of mine scrapers. Scraper weight, rope speed, and moisture content were the variables considered for each scraper type. Problem Procedure : Two kinds of scrapers were tested, namely: The box scraper and the crescent scraper. They were available in the mining laboratory. The model scrapers were constructed at a scale of 1 to 6. A small electrically-driven hoist was used to pull the buckets on a 15 foot-long table. A Westinghouse watt-meter connected with the electric motor graphically recorded the power consumed. The weight of material scraped after a given number of passes was determined. The power consumed was computed from the graphic registration of the wattmeter --Introduction, page 1-2

Contribution of domestic animals to the identification of new genes involved in sex determination

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