Gewerkschaft Eisenhutte Westfalia, Gmbh

Friedrich Eggenstein

Karl-Heinz Plester

Gunter Terhorst

Harry Rosenberg

Karl Heinz Plester

A fixing bridge for attachment to the goaf side of a channel section on a scraper-chain conveyor, is provided with connectors for the attachment of anchoring devices. A first connector is provided adjacent to one end of the fixing bridge, and a second connector is provided adjacent to the other end of the fixing bridge. The second connector is vertically off-set with respect to the first connector.

Fixing bridge

A mineral mining installation includes a longwall conveyor and a plurality of roof support units positioned side-by-side on the goaf side of the conveyor. The conveyor is braced longitudinally by a block bracing system having a plurality of hydraulic bracing rams each of which is disposed at an acute angle to the conveyor. The bracing rams act between the conveyor and floor girders of the roof support units. Each bracing ram is attached to a respective floor girder by means of a bracket. Each bracket has first and second bracket parts welded together, the first bracket part comprising means for connecting the bracket to its floor girder, and the second bracket part forming an extension of the first bracket part and carrying a pivot joint member for pivotally supporting the cylinder of the associated bracing ram. The first bracket part is a standard cast member, to which second bracket parts of differing lengths can be welded.

Mineral mining installation

A device for limiting the stroke of a hydraulic ram of mining apparatus employs a segmental stop which partly surrounds the piston rod of the ram. The stop locates between the cylinder of the ram and a head piece at the end of the piston rod. The cylinder of the ram makes contact with the stop during retraction of the ram thereby limiting the stroke of the ram. The stop is connected to the head piece via replaceable or adjustable pins. These pins permit the distance between the head piece and the stop element to be altered at will. The connection pins also enable the stop to be arranged to partly surround the piston rod periphery over different regions thereof.

Devices for limiting the stroke of a hydraulic ram used in mining

A mineral mining installation comprises a longwall structure, such as a conveyor or a winning installation, and a roof support assembly constituted by a plurality of roof support units positioned side-by-side. At least some of the roof support units are provided with hydraulic bracing rams for bracing the longwall structure longitudinally. Each bracing ram is pivotally connected between the longwall structure and the floor sill of a respective roof support unit. Each ram is connected to its floor sill by connection means constituted by a bracket slidably mounted on that floor sill for movement towards, and away from, the longwall structure. Means are provided for securing each of the brackets to its floor sill in any one of a plurality of positions.

Growing community of inventors

Bergkamen-Oberaden, Germany

Friedrich Eggenstein