The Mechanical Handling and Storing of Material
Forfatter: A.-M.Inst.C E., George Frederick Zimmer
År: 1916
Forlag: Crosby Lockwood and Son
Sted: London
Sider: 752
UDK: 621.87 Zim, 621.86 Zim
Being a Treatise on the Handling and Storing of Material such as Grain, Coal, Ore, Timber, Etc., by Automatic or Semi-Automatic Machinery, together with the Various Accessories used in the Manipulation of such Plant
Søgning i bogen
Den bedste måde at søge i bogen er ved at downloade PDF'en og søge i den.
Derved får du fremhævet ordene visuelt direkte på billedet af siden.
Digitaliseret bog
Bogens tekst er maskinlæst, så der kan være en del fejl og mangler.
i86 THE MECHANICAL HANDLING OF MATERIAL
say, 100 ft. of this conveyor would be about twenty minutes. The conveyor is built
in sections (one of which is represented in the illustration). 1 hey are each '20 ft. long,
and are joined together by steel cotters. The respective lengths of shafting are also
coupled together, the end of each length being square, and fitting into a squaie socket
Fig. 249. Lowering
Appliance in connection
with Bolinder Timber
Conveyor.
on the succeeding length
of shafting. These con-
veyors will deliver about
100 standards of 3-in. by
7-in. “ battens ” in ten
hours, while the capacity
on other sizes of timber
would be in proportion.
The same firm have
also recently introduced a
new timber conveyor which
appears to be a great im-
provement on the old one.
It consists of an endless
chain which runs over two
terminal pulleys of suitable
design. The chain itself
consists of a series of rollers,
the distance from roller to
roller being about 3 ft.
Fig. 252 shows details
of the chain; also special
link with rollers.
Fig. 253 shows a por-
tion of the conveyor
as mounted in the timber
yard.
It will be readily
understood that as the
conveyor is set in motion,
the rollers, which run on
supporting timbers, revolve,
whereupon the timber to
be conveyed is not only carried by the rollers, but
is also pushed forward by virtue of the revolution
of the rollers, so that its progress is considerably
accelerated. The chain has a speed of 90 ft. per
minute, and the timber is conveyed practically at
180 ft. per minute. These conveyors are built in
lengths of 1,000 ft., with one driving gear. Such
a length is said to take 6 H.P. to drive. The total length of such conveyors, composed
of coupled units of 1,000 ft., is unlimited, and if driven by electro-motors the driving
arrangements will require very little preparation. They pass round curves with a radius
of not less than 150 ft. for deals 30 ft. in length by 1 ft. wide. Longer deals would
•ft—
require a greater radius in proportion.