backhoe excavator
Large excavators are one of the major machines used in earthwork construction, comprised of power unit, transmission system, traveling system, rotary structure, control mechanism, electrical and working devices. The working device of excavator can be attached with dozens of different tools according to various working conditions, thus the excavators are suitable for use in many construction jobsites including road, railway, buildings, mining, water engineering and national defense etc.
At present, backhoe excavators are the major equipment used in road construction to excavate trenches and fill embankment, and usually a backhoe has to work closely with an autodumper.
There are basically two modes of backhoe operation while digging a trench. One is to dig the trench from one end while driving backward to another with an auto-dumper followed aside, the backhoe can unload the earth to the dumper within 40° to 45° swing radius. If the trench width is double the maximum excavating radius, then the backhoe has to unload the earth with a swing radius of 90°.
Another is to dig at the side of trench with a dumper at the trench end, in this way, the backhoe of large excavator can only unload the earth within a swing radius less than 90°, and the trench width is no more than the excavating radius of the backhoe.
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