Crawler loaders

Besides the above-mentioned "classic" overburden handling machines, other types of machine are used for special purposes or under special conditions, such as face shovels, scrapers, scraper-dozers, wheel loaders, crawler loaders, possibly even bucket ladder excavators or small bucket wheel excavators. 

Loader A crawler-mounted unit equipped with a coal-gathering device mounted to an inclined feed plate at the front side. A chain conveyor with an articulated loading boom discharges the coal at the opposite end into shuttle cars or any other conveying systems. It is used primarily on conventionally mined room-and-pillar sections and resembles a continnous miner without the cutting head. 

The background of the method is based on observation of almost 400 various machines. Machines are classified as heavy duty machines and contain loaders, crawler bulldozers, car and crawler cranes, power supply cars, tractors and some other special road budding machines. Machines are operated as supported ones in large power plant company. Operational system has been changing for years due to political and economical conditions. Machine age is reported as 8 up to 34 years. Operation process depends on individual duties and company demands (Jodejko-Pietruczuk et al. 2008, 2009). 

Earthmoving equipment —includes scrapers, loaders, crawler or wheel tractors, bulldozers, off-highway trucks, graders, agricultmal and industrial tractors, and similar equipment. Some OSHA rules for this type of equipment are ... 

SAE J395-1971, Minimum Performance Criteria for Roll-Over Protective Structure for Crawler Tractors and Crawler-Type Loaders, IBR approved for 1926.1001(h). 

Minimum performance criteria for rollover protective structures for designated scrapers, loaders, dozers, graders, and crawler tractors. 

For crawler tractors and crawler-type loaders Operating between 0 and 10 miles per hour over hard clay where rollover would be limited to a maximum roll angle of 360° down a slope of 45°. 

FIGURE W-12—Minimum horizontal load factor for crawler tractors and crawler-type loaders. 

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