On the issue of selecting the drive power of a scraper winch

Abstract

The power of the scraper winch motor is known to be determined based on the expression ... (see the article). Thus, it is assumed that the scraper traction force is constant during the entire time of its operation, i.e., in essence, the choice of motor power for the scraper drive is carried out as in a continuous duty mode. In fact, the operating mode of the scraper winch drive should be classified as repetitive short-time duty, since the periods of working and idle runs of the scraper alternate, which is evident from the load diagrams given below, taken by the author in the mines of the Cheryomkhov coal basin. Therefore, from the point of view of the operating mode, the choice of scraper winch motor power based on expression (1) can hardly be recommended. In this sense, it would be most appropriate, using load diagrams similar to the one given in the figure, to determine the drive power as the root‑mean‑square value. Unfortunately, this is practically almost impossible to implement, since the scraping conditions are so varied with respect to the angle of inclination of the plane of movement of the load, the nature of the scraped material, the length of the delivery route, etc., that in each specific case it would be necessary to have either load diagrams taken from actual operation, or a large number of load graphs recorded on tape, on the basis of which experimental coefficients could be derived.

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