Judge and handle the kelly bar slips down slowly after the machine stop working

Judge and handle the kelly bar slips down slowly after the machine stop working

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Fault phenomenon

Kelly bar slips down slowly after the machine stop working

Problem analysis

1. The space between the friction plate is too big;

2. Oil-addition pipes are not enough;

3. The floating magnetic valve is blocked and not back to the metro-position;

Handling method

1. Change.

2. Check pressure of oil-addition;

3. Clean or change the valve element;

Discriminated method

1. Kelly bar slips down automatically after the machine stopping work;

2. Use instrument to measure;

3. Pull the plug move the magnetic valve by hand;