Hydraulic circuit for longwall mining
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United States of America Patent
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Feb 24, 2015
Grant Date -
May 3, 2012
app pub date -
Jun 18, 2010
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 incorporates a pressure monitoring device in the pressure line between the load maintaining valve and the shield control valve. The pressure monitoring device can be a device for monitoring the piston position of the shield control valve which device signals a deviation of the set position predetermined by the shield control device from the measured actual position of the piston of the shield control valve in the form of a deviation signal. It may also be a pressure sensor which signals the deviation of the set pressure predetermined by the shield control device from the measured actual pressure in the form of a deviation signal. Signaling can be acoustic or optical.
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