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
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460
THE MECHANICAL HANDLING OF MATERIAL
and buckets extended to their utmost limit. If it be desired to shorten it, the head
gear of the elevator itself is pulled back so as to take up the surplus band and buckets,
this backward movement of course altering the delivery point. In this device a number
of suitable outlets a a are provided which lead to the band conveyor, and this in its
turn takes the grain to the mill. The buckets are of such a shape that they do not
spill the grain even when the top portion of the elevator is nearly horizontal.
Travelling Grain Elevator at Avonmouth Docks.—This installation was
erected by Messrs Spencer & Co., Ltd., of Melksham, for the Bristol Docks Committee at
the Avonmouth Docks.
The elevator was designed for a capacity of 75 tons per hour, but was proved on
test capable of taking from a vessel’s hold rather more than 100 tons of grain per hour.
It is built on the balanced lattice girder principle, and has double elevator legs so
Fig. 639. Unloading Device with Barge Elevator.
arranged as to operate on both sides of the steamer’s shaft-tunnel or cargo-parting boards,
thus considerably reducing the cost of trimming. The whole structure is mounted on
eight wheels, having a wheel base of 20 ft., and arranged to run on rails laid down at
t. gauge. Hand gear is fitted to these travelling wheels in such a manner that the
whole apparatus may be shifted by means of manual labour.
The elevator itself stands 100 ft. high when housed, and is capable of unloading
vessels up to 00 ft. beam. It is so constructed as to lift the grain from any level within
a range of 25 ft. below the coping of the quay, and to rise clear over the vessel’s hatches
when such are 22 ft. above the coping edge, thus having a total range of travel of no less
than 47 ft. up and down. .
The elevators are fitted with buckets 13 in. wide which are pitched 12 in. apart.
Fig. 641 shows the elevator in a housed position when not in use.
Fig. 642 shows it at work taking grain from a vessel’s hold and delivering to the
granary alongside. The total weight of the whole apparatus is between 90 and 100 tons,