دانلود پاورپوینت SHOVELS

William S. Otis, of the firm of Carmichael, Fairbanks and Otis, when living in Canton, Massachusetts in 1834 and 1835, while his firm was performing grading work for the Boston & Providence Railroad built the first steam excavator – a steam shovel.

OTIS SHOVEL

AN EARLY SHOVEL

SHOVELS:

Front shovels are used predominately for hard digging above track level and for loading haul units.

Loading of shot rock woauld be a typical application.

STEP 1: BUCKET SIZE:

Shovels can usually be equipped with different size buckets.  Bottom dump buckets are also available.

Buckets are rated in both heaped and struck capacities.

Both PCSA and SAE use a 1:1 angle of repose for evaluating heaped bucket capacity.  CECE specifies a 2:1 angle of repose.

Heaped Capacity is the rating of interest for Production Estimating.

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