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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THE AUTOMATIC WEIGHING OF MATERIAL 715
piece and thence into either sack as required. These machines are best fitted with
glass-panelled covers, which not only obviate any escape of dust, but also prevent
any tampering with the mechanism.
Avery’s Automatic Scale for Weighing Coal, Coke, Minerals, and Similar
Materials.—This weighing machine is very similar to the one for grain already
described, and is illustrated in Figs. 1023 and 1024. A machine with a hopper capacity
of 2 cwt. per discharge is usually installed for weighing small coal in connection with
bunkers, etc. It is worked by gravity alone and requires no power either electrical or
mechanical to operate it. The machine is fitted with locking gear which prevents any
coal passing through unweighed.
These automatic coal weighers are chiefly employed in boiler-houses, and the
majority of the leading electric power stations at home and abroad are now equipped
with these machines. In particular the Glasgow Corporation may be mentioned as
Figs. 1025 and 1026. Method of Employing Avery’s Scales in a Boiler-House of the
Glasgow Corporation Electricity Department.
.among the latest users of the Avery machine; they have installed some forty of them,
one of which may be seen in Figs. 1025 and 1026.
By means of these automatic weighers the mechanical stokers are automatically
fed with coal from the bunkers above, and a record is kept of the total consumption of
fuel. The machine is supported on brackets bolted to the girders and has a feed
hopper above which is connected by spout with the coal bunker. As the coal passes
through the scale, its weight is duly recorded ; it then falls into the discharge hopper
below, and thence into the spouts which feed the stoker hoppers.
Charge after charge is weighed and delivered to the stoker hoppers until the spouts
leading to them are quite full, whereupon the weighing machine stops automatically.
As soon, however, as sufficient coal has been used by the stokers to clear the shoot,
the weighing machine will recommence work, and in this way always adapts itself to
the consumption of coal.
Instead of fixing a machine beneath each coal bunker, another method is to have
one large machine fitted, on a travelling frame which runs on rails overhead and can be