Advance mechanism for a mine roof support unit
AssigneeGewerkschaft Eisenhutte Westfalia
InventorsEgon Wojaczek, Mustafa Soliman, Juergen Schulte
Life of this patent
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Abstract
A roof support unit has a pair of spaced floor girders and an advance mechanism comprising a hydraulic advance ram and a pair of relay rods connected, at one end, to a head-piece which is attached to a longwall conveyor. The other ends of the relay rods are attached to a guide element which is slidably guided by a pair of guide rails attached to the mutually-facing sides of the floor girders. The hydraulic advance ram is pivotally attached to the guide element and to the floor girders. Means are provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurized.
Claims13
An advance mechanism for a roof support unit having a pair of spaced floor girders (11), the advance mechanism comprising a hydraulic advance ram (22) and a pair of generally parallel relay rods (18), one end of each of the relay rods being connected to a head-piece (19) configured for attachment to a longwall conveyor, the other end of each of the relay rods being attached to a guide element (20) which is slidably guided by guide rails (21) attached to the mutually-facing sides of the floor girders, the hydraulic advance ram being pivotally attached to the guide element and to the floor girders, alignment means being provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurised, wherein the guide rails are formed with inclined guide surfaces (21c), and the guide element is provided with abutment means (27) engageable with the guide surfaces, said alignment means including the guide surfaces and the abutment means, and the guide surfaces being positioned adjacent said ends of the floor girders remote from the head-piece.
A mine roof support unit having a pair of spaced floor girders and an advance mechanism, the advance mechanism comprising a hydraulic advance ram and a pair of generally parallel relay rods, one end of each of the relay rods being connected to a head-piece configured for attachment to a longwall conveyor, the other end of each of the relay rods being attached to a guide element which is slidably guided by guide rails attached to the mutually-facing sides of the floor girders, the hydraulic advance ram being pivotally attached to the guide element and to the floor girders, alignment means being provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurised, wherein the guide rails are formed with inclined guide surfaces, and the guide element is provided with abutment means engageable with the guide surfaces, said alignment means including the guide surfaces and the abutment means, and the guide surfaces being positioned adjacent said ends of the floor girders remote from the head-piece.
A mine roof support unit having a pair of spaced floor girders and an advance mechanism, the advance mechanism comprising a hydraulic advance ram and a pair of generally parallel relay rods, the relay rods being connected at one end to a head-piece which is attached to a longwall conveyor, the other ends of the relay rods being attached to a guide element which is slidably guided by guide rails attached to the mutually-facing sides of the floor girders, the hydraulic advance ram being pivotally attached to the guide element and to the floor girders, wherein alignment means are provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurised, wherein the guide rails are formed with inclined guide surfaces, and the guide element is provided with abutment means engageable with the guide surfaces, said alignment means including the guide surfaces and the abutment means, and the guide surfaces being positioned adjacent said ends of the floor girders remote from the head-piece, and wherein a spacer is fitted between the floor girders, the spacer constituting means for limiting the movement of said ends of the floor girders when the hydraulic advance ram is pressurised.
A mine roof support unit having a pair of spaced floor girders, a roof shield supported above the floor girders by hydraulic props, a goaf shield pivotally attached to the roof shield, a pair of links pivotally connecting the goaf shield to the floor girders, and an advance mechanism, the advance mechanism comprising a hydraulic advance ram and a pair of generally parallel relay rods, the relay rods being connected at one end to a head-piece which is attached to a longwall conveyor, the other ends of the relay rods being attached to a guide element which is slidably guided by guide rails attached to the mutually-facing sides of the floor girders, the hydraulic advance ram being pivotally attached to the guide element and to the floor girders, wherein alignment means are provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurised, wherein the guide rails are formed with inclined guide surfaces, and the guide element is provided with abutment means engageable with the guide surfaces, said alignment means including the guide surfaces and the abutment means, and the guide surfaces being positioned adjacent said ends of the floor girders remote from the head-piece, and wherein a spacer is fitted between said links, the spacer constituting means for limiting the movement of said ends of the floor girders when the hydraulic advance ram is pressurised.
Dependencies are inferred from the claim text.