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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20
THE MECHANICAL HANDLING OF MATERIAL
than usual, with the intervening space covered by a light plate, so as to keep all dust
from the links and other moving parts.
The shape of the buckets and the angle of the elevator should be so arranged as
to give a clean discharge without further devices. The capacity of the elevator must
be quite equal to what the conveyor feeding it can ever bring to it, to suit the conditions
of discharging from the retorts, which might be almost continuous or very intermittent.
Width of Bucket. Projections of Bucket. Speed of Elevator Belt in Feet per Minute.
250 300 350 400 450 500 550 600 650
Inches. Inches. 22 26
4 10 12 14 16 18 20 24
4 5 15 17 19 21 23 25 27 29 31
6 20 22 24 26 28 30 32 34 36
4 15 18 21 24 27 30 33 36 39
6 5 22| 25| 28| 31| 34j 37| 43| 46|
6 30 33 36 39 42 45 48 51 54
4 20 24 28 32 36 40 44 48 52
8 5 30 34 38 42 46 50 54 58 62
6 40 44 48 52 56 60 64 68 72
4 25 30 35 40 45 50 55 60 65
10 5 37 42| 47^ 52| 57| 62| 67| 77|
6 50 55 60 65 70 75 80 85 90
4 30 36 42 48 54 60 66 72 78
12 5 45 51 57 63 69 75 81 87 93
6 60 66 72 78 84 90 96 102 108
4 45 54 63 72 81 90 99 108 117
18 - 5 67| 76^ 85| 94 103j 112| 121A 130| 139|
6 90 99 108 117 126 135 144 153 162
4 60 72 84 96 108 120 132 144 156
24 90 102 114 126 138 150 162 174 186
6 120 132 144 156 168 180 192 204 216
4 75 90 105 120 135 150 165 180 195
! 30 127j 141j 172| 187| 202| 217J 232|
6 150 165 180 195 210 225 240 255 270
General Remarks Concerning Elevators for Grain and other Light
Materials.—The driving spindle of the upper terminal should be sufficiently strong
to support the weight of the elevator itself as well as the load to be conveyed; the pulley
and spindle at the lower terminal are merely guides to keep the belt taut and in the
proper position. The elevator foot should be fed at a point not lower than the centie
of the pulley, while the discharge at the elevator top should not be higher than the
level of the under side of the internal pulley. If the delivery spout be placed higher
than this, some of the material will miss the spout and drop into the elevatoi well,
causing a draught of air and an overloading of the elevator, with consequent loss of
power, as in such a case a proportion of the material will be carried round and round.
The draught of air caused by the particles falling into the elevator well is perhaps of