HYDRAULIC BUCKET WHEEL EXCAVATORS--DESIGN AND PERFORMANCE
The manufacture of hydraulically-driven bucket wheel excavators in West Germany is reported. Developments in the 1970's have resulted in giant machines with performances up to 240,000 cubic meters of bank per day and in hydraulically-driven standard machine types. Experience with bucket wheel excavators shows that the best output is obtained when material dug by the excavator is transported away continuously by conveyor. Performance is further improved if a belt wagon is introduced, making it possible for the excavator to remove several blocks with the face conveyor remaining in the same position. A series of all-hydraulic bucket wheel excavators and belt wagons has been developed and put into operation by a West German firm. Energy can be provided by diesel engines mounted in the excavator itself or fed in by high-tension electric cables. A simplified hydraulic layout for one machine shows that oil feed can be directed to the drive which needs the most energy at a particular moment of operation. The hydraulically-driven bucket also makes adjustment of power regulation very simple. When the digging force acting on the wheel periphery exceeds a certain value, the speed of revolution drops with the slewing speed; thus peripheral force increases while length of the bucket edge engaged in cutting is reduced. Both measures enable harder layers to be cut without the bucket wheel being disengaged due to overloading. Driving pulleys of conveyor belts are hydraulically-powered belt pulleys with built-in gear boxes. Specific excavator models are described and illustrated.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
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Supplemental Notes:
- Presented at SAE Earthmoving Industry Conference, Peoria, Illinois, 10-12 April 1978.
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Corporate Authors:
Society of Automotive Engineers (SAE)
400 Commonwealth Drive
Warrendale, PA United States 15096 -
Authors:
- Durst, W E
- Publication Date: 1978
Media Info
- Pagination: 14 p.
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Serial:
- SAE Technical Paper
- Publisher: Society of Automotive Engineers (SAE)
- ISSN: 0148-7191
- EISSN: 2688-3627
- Serial URL: http://papers.sae.org/
Subject/Index Terms
- TRT Terms: Conveyors; Design; Excavating equipment; Hydraulic equipment; Performance
- Subject Areas: Design; Safety and Human Factors;
Filing Info
- Accession Number: 00396319
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 780489, HS-025 513U
- Files: HSL, USDOT
- Created Date: Aug 31 1985 12:00AM