A robustly constructed range of vibratory machines extending from units 0.5m wide x 2m long up to units 1.5m x 4.5m. The machines are intended primarily for use ahead of primary crushers and are designed to handle large run-of-quarry stone, take the impact of dumped loads and smooth out the flow of material to the crusher. All models have a flat reinforced impact area followed by a sloping grizzly bar section. The longer machines are fitted with two stepped, grizzly bar sets. Replaceable wear sections of mild steel, manganese steel or rubber are fitted depending on the duty specified.
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Of rugged construction throughout, Grizzly Feeders are designed to handle run of quarry stone up to 1000mm lump size.
The plain section is lined with a 12.5mm minimum thick replaceable plate in mild steel as standard, with abrasion resistant manganese steel and rubber elements as options. |
Stated throughputs are based on a material density of 1.6 t/m3 and a bed depth equal to the trough height and are, therefore, very conservative. Higher outputs can be achieved but, if the bed depth is increased, the amount of fines in the feed should be considered because of the risk of carry-over of fines in the product. Grizzly bar sections have a high capacity rating owing to the long open spacing between the bars. However, they can also pass elongated or slabby material, which may not be acceptable for all applications.
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The area needed for the Grizzly Bar Section may be calculated from the following empirical formula and tables. The resulting figure provides a guide to the Grizzly Feeder model required (see table on page 2 dimension A x dimension I).
Grizzly Bar area (m2) =
Tonnes per hour of undersize
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Capacity/m2 A x Factor B x Factor C
CAPACITY A Material at 1.6t/m3 with 75% Efficiency
FACTOR B Percentage oversize in the feed.
FACTOR C Percentage material less than 1/2 Nominal bar spacing.
Capacity A - Material at 1.6t/m3 with 75% efficiency rate
Spacing of Bars |
25 |
50 |
75 |
100 |
125 |
150 |
175 |
200 |
Capacity/m2 |
48.9 |
67.8 |
90 |
111 |
166 |
191 |
212 |
258 |
Factor B - % oversize in the feed
% |
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
85 |
90 |
B |
1.05 |
1.01 |
0.98 |
0.95 |
0.90 |
0.86 |
0.80 |
0.70 |
0.64 |
0.55 |
Factor C - % material less than 1/2 nominal bar spacing
% |
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
85 |
90 |
C |
0.55 |
0.70 |
0.80 |
1.00 |
1.20 |
1.40 |
1.80 |
2.20 |
2.50 |
3.00 |
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Grizzly Feeders may be supplied complete with Variable Feed Rate Controllers. They incorporate the very latest frequency inverter technology for applications that require frequent adjustment of the feed rate.
For other applications twin vibrator phase reversal braking starters which enable the unit to stop within seconds may be suitable. The number of stop/starts that may be made per hour is limited depending upon conditions.
Consult us about your Electrical control Equipment requirements.
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