A device used to a limited extent to load solid blocks of coal. The scow
proper is a flat steel plate that is moved underneath the undercut and
blocks the coal by means of a hoist and a tail rope. The coal is then
wedged down on the scow, and the solid block is hauled by means of the
hoist and a headrope to a delivery point where it is transferred to cars.
Jones, 1
See:scowle
Forest of Dean. Ancient ironstone quarry and mine workings.
Syn:scowl bowl
Hardpan; Isle of Man, U.K.
a. To search for and extract ore in a mine that is apparently worked out.
Weed, 2
b. An Alabama term for a small soft-coal mine complete in itself.
See:scram drive
a. Underground drive above the tramming level, along which ore is moved by
scrapers (slushers) to a discharge chute. Pryor, 3
b. See:scram drift
a. Defective product not suitable for sale. ASM, 1
b. Discarded metallic material, from whatever source, which may be
reclaimed through melting and refining. ASM, 1
c. Som. Stone only fit for rough walling. Arkell
d. See:diamond scrap
In the iron and steel industry, one who presses, in a baling press, steel
scrap into compact blocks, for remelting in the open-hearth furnace. Also
called scrap builder; scrap pressman. DOT
The uneven ends of the muck bars. Mersereau, 2
Indian scrap-carbon process using 100% steel scrap in which petroleum coke
replaces carbon and acid slag replaces silicon. The hearth is protected
from erosion by spreading an easily fusible silica sand over the banks
before charging, and manganese ore is used instead of iron ore for
oxidizing the carbon. Osborne
a. A rod for cleaning out a shothole prior to charging with explosives.
See also:stemmer; spoon. Nelson
b. A mechanical contrivance used at collieries to scrape the culm or slack
along a trough to the place of deposit.
c. A machine used in mines for loading cars and transporting ore or waste
for short distances. There are two basic types of scraper: (1) the hoe or
open type, which is particularly suitable for moving coarse, lumpy ore;
and (2) the box or closed type, which is particularly suited for handling
fine material, esp. on a loading slide. Syn:box scraper
d. A digging, hauling, and grading machine having a cutting edge, a
carrying bowl, a movable front wall (apron), and a dumping or ejecting
mechanism. Also called carrying scraper or pan. Nichols, 1
e. An apparatus used to take up coal from the floor of a mine, after it
has been shot, and deposit it either in cars or in a conveyor.
See:spoon
f. A rubber-tired device used to move earth in surface mining. BCI
g. See:carryall
h. See:poker man
i. The name applied to a bowl scraper or a multibucket excavator. Also
known as a scraper excavator. Hammond
In Great Britain, every shot firer is provided with a scraper for cleaning
out shotholes, and in safety lamp mines a break detector must also be
provided. The two tools are combined in the scraper and break detector. It
can clean out a shothole and detect breaks in the walls of 1/8 in (3 mm)
or more in width. The firing of a shot in a hole traversed by a crack
exceeding 1/8 in in width is forbidden. Nelson
a. A layout of rope-drawn scraper boxes with knives on the face side. They
are drawn to and fro, and pushed against the face by guides controlled by
rams. A haulage of 250 hp (186 kW) must be installed in a semipermanent
engineroom; it has a rope diameter of 1-1/4 in (3 cm) and a speed of 3
ft/s (1 m/s). No conveyor is required as the coal is scraped by boxes to
the loading point. The maximum workable seam thickness is 20 in (51 cm) on
gradients of 0 degrees to 30 degrees ; maximum length of face, 220 to 275
yd (200 to 250 m); and advance per shift, 6-1/2 to 8 ft (2.0 to 2.4 m).
Nelson
b. See:Haarmann plow; Kema plow; Gusto scraper box.
a. One of the excavating bowls or buckets that form part of a scraper.
Hammond
b. In coal mines, the scraper bucket is a bottomless, three-sided box,
with a hinged back. The hinge operates in a forward direction so that on
the return journey on the coal face the back opens allowing the box to
remain empty. On the loading journey, the coal closes the hinge and the
material is drawn or scraped forward to the point of discharge.
Syn:scoop
See:chain conveyor
a. A mechanical device for conveying coal, rock, ashes, culm, etc., in a
metal trough by means of scrapers attached to a rope or chain.
b. A conveyor consisting of chain-drawn scrapers or flights running in a
trough through which they push the material to be transported. Also called
drag-link conveyor; flight conveyor; chain conveyor. BS, 5
A power-driven hoist that operates a scraper to move material (rock or
coal) to a loading point.
a. A machine used for loading coal or rock by pulling an open-bottomed
scoop back and forth between the face and the loading point by means of
ropes, sheaves, and a multiple drum hoist. The filled scoop is pulled on
the bottom to an apron or ramp where the load is discharged onto a car or
conveyor. Jones, 1
b. A combined scraper and transporting machine. Originally towed by a
tractor, but now diesel-electric with a direct current motor in each
wheel. Pryor, 3
c. A double-drum winch with two steel ropes. The loading capacity of a
scraper loader ranges from 30 to 80 tons per hour depending on conditions.
The loader is used for transporting and loading coal on longwall faces,
for removing and loading stone in tunnels, and for stowing dirt on
longwall faces. Syn:slusher
One scraper box with picks, rope-drawn and unguided along the face. A
30-hp (22.4-kW) haulage advances with the face, which is made convex to
eliminate the need for guides. Speed, 3 to 4 ft/s (approx. 1 m/s).
Suitable seam conditions; thickness, 12 to 24 in (30 to 60 cm) at
gradients of 0 degrees to 35 degrees (preferably 15 degrees to 25 degrees
); and maximum length of face, 65 yd (60 m). Syn:porte et gardin plow
Nelson
Strip-mine equipment that breaks, loads, and hauls coal. Features include
ripping teeth on the lip for breaking the coal and a flight conveyor for
carrying the broken coal away from the lip. As the ripper teeth bite into
and loosen the coal, the conveyor sweeps the loose coal upward and
prevents buildup ahead of the lip. Coal Age, 3