Hydraulic circuit for longwall support
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United States of America Patent
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Nov 4, 2014
Issued Date -
N/A
app pub date -
Mar 15, 2012
filing date -
Jul 16, 2009
priority date (Note) -
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Abstract
A hydraulic circuit for longwall support for use in underground mining for supporting a longwall by means of a plurality of support shields includes in the annular piston line of each cylinder/piston unit a pressure sensor. The pressure sensor, upon reaching a predetermined maximum pressure activates a pressure deviation signal, causes the entire longwall to be depressurized by means of a longwall shut-off valve. The pressure deviation signal is blocked for one of the hydraulic valves against each triggering signal.
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