The Carman Drawdown Hopper is designed for all types of outdoor storage piles. The discharger’s Projection Ring transmits vibrations throughout the pile, encouraging “slough-in”. Wet and frozen materials such as coal, potash, salt and aggregate come to life and flow from outside storage reclaim piles. GREATER EFFICIENCY FROM VIBRATION The Vibratory Drawdown Hopper is located at ground level below the stockpile, and its function is to provide the initial flow stimulation. Once product movement is established the flow rate is regulated by the Flow Control Gate. Overall control is achieved by linking a downstream belt weigher to the Flow Control Gate operation. This system can provide 80% more live reclaim compared to a static hole, and is a very effective and cost efficient method of stockpile reclaim. STOCKPILE DISCHARGE PROBLEMS Minimal Active Reclaim: • By utilising a static hopper and feeder, active reclaim is limited to within approximately 40° of the stored material’s natural angle of repose. Bridging: • Bridging is the archlike formation of material over either the static hopper inlet or outlet. It results from improperly designed hoppers or when the outlet is too small. Coring: • Coring occurs when the material in the core of the pile discharges, while material on the periphery resists movement. HOW THE DRAWDOWN HOPPER ELIMINATES THESE PROBLEMS Maximise Active Reclaim: • Carman Drawdown Hoppers consistently increase active reclaim to within 5 to 10 degrees of a material’s natural angle of repose. A Carman Drawdown Hopper can provide 4 to 5 times the reclaim of an equally sized static hopper with a feeder. Bridging Solution: • Carman Drawdown Hoppers have command of the material equal to the Drawdown diameter. This results in an initial flow column equal in diameter to the overall diameter of the Drawdown Hopper. A highly visible flow steam also improves on-pile equipment operator safety. Coring Solution: • The projection ring of the Carman Drawdown Hopper, which is always exposed to the pile, transmits vibration and energy directly into the pile. This eliminates coring and maximises active reclaim. Drawdown Hoppers & Flow Control Email: [email protected]www.hmagrp.com
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Transcript
The Carman Drawdown Hopper is designed for all types of outdoor storage piles. The discharger’s Projection Ring transmits vibrations throughout the pile, encouraging “slough-in”. Wet and frozen materials such as coal, potash, salt and aggregate come to life and flow from outside storage reclaim piles.
GREATER EFFICIENCY FROM VIBRATIONThe Vibratory Drawdown Hopper is located at ground
level below the stockpile, and its function is to provide
the initial flow stimulation. Once product movement
is established the flow rate is regulated by the Flow
Control Gate. Overall control is achieved by linking
a downstream belt weigher to the Flow Control Gate
operation.
This system can provide 80% more live reclaim
compared to a static hole, and is a very effective and
cost efficient method of stockpile reclaim.
STOCKPILE DISCHARGE PROBLEMSMinimal Active Reclaim:
• By utilising a static hopper and feeder, active
reclaim is limited to within approximately 40° of the
stored material’s natural angle of repose.
Bridging:
• Bridging is the archlike formation of material over
either the static hopper inlet or outlet. It results
from improperly designed hoppers or when the
outlet is too small.
Coring:
• Coring occurs when the material in the core of the
pile discharges, while material on the periphery
resists movement.
HOW THE DRAWDOWN HOPPER ELIMINATES THESE PROBLEMSMaximise Active Reclaim:
• Carman Drawdown Hoppers consistently
increase active reclaim to within 5 to 10 degrees
of a material’s natural angle of repose. A Carman
Drawdown Hopper can provide 4 to 5 times the
reclaim of an equally sized static hopper with a
feeder.
Bridging Solution:
• Carman Drawdown Hoppers have command of
the material equal to the Drawdown diameter. This
results in an initial flow column equal in diameter