Power Shovel


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power shovel

[′pau̇·ər ‚shəv·əl]
(mechanical engineering)
A power-operated shovel that carries a short boom on which rides a movable dipper stick carrying an open-topped bucket; used to excavate and remove debris.

Power Shovel

 

(1) A type of single-bucket excavator characterized by rigid linkage between the arm and the bucket. Power shovels may be of the scoop or backhoe type. The straight scoop is used for excavations in construction, for stripping and mining in open pits, and for scooping out ore in underground mines (tough rock formations are first loosened by explosives). Power shovels for construction usually have buckets with a capacity of up to 3 cu m; those for opencut mining, 2–22 cu m; those for stripping, up to 150 cu m; and those for underground mining, up to 3 cu m. Soviet straight-scoop power shovels have buckets with a capacity of 0.25-35.0 cu m. Preparation is in progress for the production of power shovels with a bucket capacity of 100 cu m. The annual productivity of a power shovel is 120,000-250,000 cu m per cubic meter of bucket capacity, and the corresponding energy consumption is 0.4-0.8 kilowatt-hour per cu m, depending on the conditions of operation.

The backhoe differs from the straight scoop in the direction of motion of the bucket; it is used for the excavation of ditches and trenches and for other work in which the excavation level is below the level of the excavator. Soviet backhoe power shovels have bucket capacities of 0.15-2.0 cu m. Their productivity is about 20 percent lower than that of straight scoops with the same bucket capacity.

(2) A cable-scraper unit for unloading bulk materials (grain, cement, and so on) from covered railroad cars.

V. G. AFONIN

Power shovel

A power-operated digging machine consisting of a lower frame and crawlers, a machinery frame, and a gantry supporting a boom which in turn supports a dipper handle and dipper. The machines are powered by on-board diesel engines or by electric motors. Diesel-powered machines utilize a series of clutches and brakes that allow the operator to control various motions. Electric motor machines generally have individual motors for each motion, but occasionally clutches and brakes are used allowing one motor to drive two motions. See Bulk-handling machines, Construction equipment, Hoisting machines

power shovel

power shovel
1. A power-operated machine used to excavate and load dirt, rock, or debris by means of an open-ended bucket at the end of an arm which is suspended from a boom; cables or hydraulic rams force the arm (and therefore the bucket) forward and upward, into the material; then the bucket is raised and its load is dumped.
2. A machine having a scoop or bucket for digging up or removing loose material.
References in periodicals archive ?
For these reasons, I would dissent from the majority's legal conclusion even if I agreed with its factual premise--that there is no difference between a power shovel or backhoe and a front-end loader that warrants different treatment.
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He called it the Power Shovel and it was constructed largely of Ford truck parts.
Shoemaker was a division controller and a financial analyst for FMC Corporation, and Materials Manager for Marion Power Shovel, now a division of Dresser Industries.
The landowners turned workers away as they showed up along with machinery, excavators and power shovels.
We were thrown together during our seven-week shoot, and that was very bizarre: in the morning, the workers would leave with their power shovels while we headed out to the next film location.
One day in March four militants approached Khaled Hujeiri's quarry and took his power shovels, in plain sight, he said.
In Cardiff 600 men worked round the clock clearing streets which were swiftly blocked again, even though 30 bulldozers, 20 power shovels, 11 snow ploughs and 200 lorries were in constant action.
During August, bulldozers, scrapers and power shovels began site preparation for the ITER tokamak pit and the poloidal coils assembly building.
Equipment tested for vibration levels can range from power shovels, bulldozers, helicopters and cranes to forklifts, earth-moving equipment, trucks and tractors.
Exports of construction machinery such as power shovels and excavators dropped 32.
It has been the most chilling testimony in the 14 months since Saddam Hussein and his associates first went on trial: an account of how Iraqi death squads took 301 victims to remote desert sites in the late 1980s, herded them into pits dug by power shovels and gunned them down.