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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CHAPTER XI
SUMMARY OF DRIVING POWER, SPEED OF TRAVEL, AND
WEAR AND TEAR OF ELEVATING AND CONVEYING
MACHINERY
Driving Power Required for Different Types of Conveyors.—In order to
afford an easy comparison between the driving power required by the conveyors
described in the preceding pages, the table given below has been compiled. It gives
the horse power per hour of different conveyors for loads of 50 tons and lengths of 100 ft.
Horse Power.
Band conveyor for grain - - ----- - 4-8
„ ,, minerals ------ 5-0
Zimmer conveyor (balanced) ------ 7'75
,, ,, (unbalanced) ------ 8'75
Push-plate conveyor ------- 12'8
Worm conveyor - - - - - - - 25’0
Push-plate conveyors of the same dimensions and capacity, when fitted with a
pair of wheels on each plate and well lubricated, may take only about 5 H.P., but
this depends almost entirely upon the lubrication.
Some difficulty has been experienced in obtaining reliable data concerning the
power consumed by conveyors, but the figures given above may be relied on for
practical purposes.
Comparative Rates of Travel of the Different Types of Conveyors1
Average Speed.
Band conveyor (for grain) between 250 and 700 ft. per minute 475
„ ,, (for heavy material) „ . 150 „ 700 „ 425
Push-plate conveyor „ 50 „ 180 „ 115
Trough cable conveyor - „ 100 „ 120 „ 110
Travelling trough conveyor „ 60 „ 120 „ 90
Zimmer conveyor „ 40 „ 60 50
Worm conveyor- „ 40 „ 60 „ 50
Wear and Tear of Elevating and Conveying Machinery.—It may be of
interest to compare the cost of upkeep of elevating and conveying plant of different
types given in the following table.
With the exception of the last item, the following table has been compiled by
the late Mr W. R. Chester, of Nottingham, who, as engineer to the Nottingham Gas-
works, tabulated this valuable information from plant under his personal supervision.
1 The above speeds are taken from conveyors in actual work, but the author can see no reason
why push-plate, trough cable, and travelling trough conveyors should not run at 60 to 180 ft. per minute.
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