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Feeding screw blockage

Feeding screw blockage or constantly breaking cotter spin ?

If a feeding screw blockage or cotter break happens, first, screw off the feeding screw together with motoreducer and clean its tube inside. Something may have get into it, like coal or wood. Surely, a lot of dust must have settled inside after a long time of usage. This dust has to be removed. Unjustified, frequent feeding screw blockage or cotter breaking may be caused by corrosion or expenditure. Wet coal + acidic substances that it contains (sulfur) may have caused the problem. Uneven or porous surface, indentation, cavities result in higher resistance in the feeding screw work, which leads to its blockage, cotter breaking and switching on an alarm indicator in the steering. What to do in such a situation? The feeding screw must be polished (its surface must be smooth and shiny), painted with anti corrosive paint, or replaced. The order for a new feeding screw must include precise description of the boiler model and the manufacturer of the feeder. There must also be given the length of the working part of the feeding screw, and the length and diameter of the fitting part – axis entering the motoreducer. Another information is if the fitting part – axis has a molded groove for chock and if there is a hole for a cotter spin.

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