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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702
THE MECHANICAL HANDLING OF MATERIAL
passage of railway trucks along the dock side, being raised on legs, which is a novel
feature. The leg of the elevator can not only be raised and lowered, but it can also be
swung from side to side, thus enabling a large area to be covered without it being
necessary to change the position of the boat which is in course of unloading. The ship
elevator, when not in use, can be raised out of the way, and this raising and lowering is
effected by means of an electrically driven winch in the tower, and the elevator is balanced
by weights, which greatly facilitates the operation. The elevator is capable of dealing
with 150 tons of grain per hour. Vessels in any position on the quay side can be
dealt with, and the following sequence of operations briefly explains the method of
unloading.
The ship elevator is lowered into the hold, and the grain elevated, weighed, and
passed on to 27-in. wide band conveyors in the gantry parallel to the wharf, which feed
on to either of the two bands, one 27 in. and the other 36 in., in the other gantry.
The grain is then elevated by one of two 150-ton per hour elevators to the top of the
silo building, and from thence it is distributed to any required bin or storage room.
The front gantry, alongside which the ship elevator travels, is 530 ft. long, and grain
is taken in from the ship elevator at any point along this distance. The approach gantry
leading to the receiving house is 300 ft. long. There are eighty-two bins and six storage
floors, and these latter are each arranged with thirty-six floor spouts, which are fitted
with sliding sleeves at the top and bottom, by means of which the grain may be fed to
or taken from any floor. By raising the top sleeve and placing a conical cap or spreader
on to the spout, the grain may be distributed over the floor to any required height. To
discharge the grain it is necessary to raise the bottom sleeve and to lower the same when
sufficiént grain has been drawn off. For taking out sacks from the granary, they are
carried on the bands in the approach gantry to an outside conveyor in the centre of the
front gantry, delivering direct to ships and barges. This conveyor may be housed in a
tower in the centre of the front gantry. The band is completely enclosed, and there
is thus no risk of the grain being damaged when being loaded out. This band may also
be used for loading out in bulk.
On the first floor of the building are six Avery portable grain weighers with sacking-
off appliances. The grain, when sacked off, can be delivered by sack shoots either into
trucks or on to sack bands, which extend along both gantries and thence through shoots
into boats. The outgoing grain can also be handled in bulk with equal facility. On
the ground floor a number of conveyors are placed, and these are fed from the silos, and
delivery of the grain is effected to either of the elevators. These conveyors aie used
for turning over purposes. The bands, over the silos and floor storage, are capable of
dealing with 300 tons of grain per hour.
The machinery equipment includes twenty-two motors with an aggregate of
270 H.P. The majority of the motors are back-geared, and the band conveyors and
elevators are driven by chains, thus obviating the use of the large gear wheels generally
found on elevator heads. This method of drive is stated to have proved very satisfactory,
light, and remarkably free from noise. The power is transmitted to the travelling ship
elevator through a series of plugs placed along the front gantry, a loud speaking telephone
being meanwhile connected up by the single plug.
In conclusion, it may be said that the buildings were constructed by Stuait s
Granolithic Co., Ltd., of Bedford Row, W.C., and the gantries and grain-handling
machinery were manufactured and erected by Henry Simon, Ltd., of Mount Street,
Manchester—all to the requirements of Mr J. B. Ball, M.Inst.C.E., the engineer-in-
chief of the Great Central Railway Co.