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Author: Admin | 2025-04-28
The use of large cars. Figure 25 shows several types of scrapers used with loading slides.Among the advantages of scraper loaders is their comparatively small first cost and low maintenance charges. Power costs are low, especially if electric drive is employed; primary power consumption with electric drive is only about one-eighth that with compressed-air drive. The largest single item of operating expense next to labor is renewal of wire ropes. Another advantage lies in the fact that only the scraper, a relatively inexpensive part of the equipment, need go near the face, which is an advantage in some ground where the back may fall. The hoist, scraper, and ropes can often be used interchangeably between development headings and stopes, thus reducing the total investment in loading equipment.Although scrapers sometimes are used in small headings, ordinarily they will not save much as compared to hand loading in headings less than about 7 by 7 or 8 by 8 feet in cross section. For headings smaller than this, a small shovel-type loader is often preferable. For headings of this size and larger, scraper loading usually can show a saving in cost per foot and greater driving speed as compared to hand loading. By properly proportioning the size of the scraper and the capacity of the hoist to the size of the heading, scraper loading can be employed successfully in any size of heading above the minimum. If the proportion is right and proper facilities are provided for handling cars and eliminating delays,
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