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Danny Harvey

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Reply with quote  #1 
I just got a report from the field that one of my guys witnessed a big conveyor belt come to a complete stop for about 5 minutes while the motor continued to run.  It is about 800-1000 hp and has a nelson fluid drive.

Is this normal for such a drive? It sounds dangerous to me.
Beatnik

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Reply with quote  #2 
Yes it's normal. it's just that the scoop is low enough to collect all the oil in the chamber that includes the impeller and the runner. On conveyors that stop often it might be better to do that than starting/stopping the motors every time.
Walt Strong

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Reply with quote  #3 
Did the conveyor start moving again after the 5-minute stop, indicating no permanent damage to drive train?

Walt
Danny Harvey

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Reply with quote  #4 
Beatnik,

Thanks for the explanation.

This conveyor is part of a shiploading operation and I suspect that it was during a move of the shiploader from one hold to the next.

To answer Walt's question, yes it restarted without problems.

Beatnik's explanation of the scoop mechanism explains how this can be achieved in a fluid drive without generating heat and pressure.

Thanks for the quick answer, too.  My guy was a little apprehensive after seeing what happens when a big SIME fluid coupling loses it's oil just a few conveyors up the line.
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