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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COAL TIPS OR HOISTS
549
of the rigging or deck, and thus the door is automatically released as soon as the
bucket has reached the point of discharge. This anti-breakage crane may also be
used with advantage for discharging ballast, as well as for filling into wagons the
small coal that passes through a screen sometimes fixed in the shoots.
The latest tips of Sir W. G. Armstrong, Whitworth, & Co. are fitted with “ Burnt-
island ” anti-breakage boxes (see Figs. 773 and 774), so named from being first fitted
on one of the hoists of the North British Railway Co. at Burntisland Dock. The
appliance consists of a box fitted with side doors and a tripping ring, which automatically
opens the box at any predetermined level when it is lowered.
Notwithstanding all these precautions, the proportion of dust found in the coal
when the ships are discharged at the encl of the voyage is generally very great. This
----A 22
Figs. 773 and 774. Armstrong-Whitworth Tip fitted with “ Burntisland” Anti-Breakage Box.
breakage is undoubtedly partly due to want of care in trimming the coal in the
ship’s hold.
Hydraulic Tips at the Barry Docks.—Another hydraulic tip with a direct acting
ram is illustrated in Figs. 775 and 776. It is the design of Sir John Wolfe Barry,
and was erected by Sir W. G. Armstrong, Whitworth, & Co., Ltd., at the Barry Docks.
This hydraulic coal tip consists of a substantial wrought-iron framework supporting
the shoot for conveying the coal into the hold of the vessel, and at the same time
serving as carrying guides for the lifting cradle on which the coal wagon is laised to
the level necessary for discharging into the shoot.
The cradle itself is manipulated by two direct acting cylinders and rams (having a
lift of 37 ft.), placed below the cradle as shown in Fig. 775. One of these rams is so
proportioned as to balance nearly the whole weight of the cradle, and is in constant
communication with the hydraulic main. The action of this ram is somewhat similar to
a balance weight. The'water which is forced into the cylinder during the lifting of the
cradle is returned to the main during the lowering.
The function of the second ram is to lift the load and the unbalanced poition of the