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30” diameter screws running at 90RPM. Hanger bearings and shafting are lasting 2 weeks.

Problem:
A 30” diameter screws running at 90RPM. Hanger bearings and shafting were lasting 2 weeks.


Material:
Wood Chips, 3-5 PCF, .25” x2” x 4” and smaller size , Friable, 10-15% moisture.

Solution:
Reevaluated system design. Decreased RPM to 20. Increased level of loading to 30 to reduce load on bearings.

Result:
Hanger bearings are lasting 12 months plus.

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Bin would not discharge uniformly and had bridging problems.

Problem:
Bin would not discharge uniformly and had bridging problems.


Material:
Wheat midds. 25-30 PCF, 1/8” and smaller, 12% moisture

Solution:
Redesign screw so feeding was uniform across the length of the inlet and install strike off plates to stop the en-mass flow that was causing rat holing in bin.

Result:
Bin stopped bridging and inventory control was greatly enhanced. The first material into the bin was also the first material out.

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Material will not go up 15 degree incline. Material has flow characteristics similar to water. It is flowing back faster than it is going up incline.

Problem:
Material would not go up 15 degree incline. Material has flow characteristics similar to water. It was flowing back faster than is was going up incline.


Material:
Powder, 400 mesh,65 PCF. Dry very free flowing. Plastic

Solution:
Increase speed of conveyor.

Result:
Material was conveyed up incline at 15% fill with no problems. RPM was changed from 75 to 115.

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