Patent · US Active

Hydraulic circuit for longwall mining

US8960807B2 · kind B2 · utility

0Cited by

11References

11Claims

0Family size

Assignee

TIEFENBACH CONTROL SYSTEMS GMBH · DE

Inventors

Wilfried Weigel · Werne, DE
Gerhard Wülfing · Velbert, DE
Peter Rahms · Billerbeck, DE

Key dates

Filing date	Jun 18, 2010
Grant date	Feb 24, 2015
Priority date	—
Expiry date	Dec 24, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/8158
WIPO fieldCivil engineering
WIPO sectorOther fields

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.