Abstract:
A distributor block for interconnecting a hose bundle to a control device of a pressure fluid control system in an underground mine working has internal passageways for connecting valves of the device to individual hoses. Bores in the block receive detachable elongate coupling members which themselves have internal bores and plugs for engaging in sockets within the control device. The coupling members are journalled in the block for slight transverse and angular movements within seals.
Abstract:
A mine roof support unit has a roof shield for supporting the roof of a mine working, and a goaf shield for screening off the goaf space of the working. The mine roof support unit is provided with dust suppression means constituted by a flat-section spray nozzle arranged along the front edge of the roof shield, or along the top edge of the goaf shield. The spray nozzle is directed upwardly away from the roof support unit and towards the goaf space.
Abstract:
An electro-hydraulic control system for an underground mineral mining installation employs individual control assemblies and devices on a series of support units which are interconnected to one another and to a central control station via lines conveying electrical control signals. Manually-operable selector switches on the units enable groups of the support units to be operated in sequence at will by operating the switches of adjacent units outside the group.
Abstract:
A roof support unit for a longwall mineral mining installation has a roof shield supported above a floor sill. A first hydraulic ram is provided for advancing the roof support unit. The roof shield is provided with a forward extension which is advanceable by means of a second hydraulic advance ram. A hydraulic control arrangement, which includes the two hydraulic advance rams is provided for controlling the advance of the roof shield extension in dependence upon the working stroke of the first hydraulic advance ram. The control arrangement is such that the amount of hydraulic fluid supplied to one of the pressure chambers of the second hydraulic advance ram is dependent upon the amount of hydraulic fluid expelled from one of the pressure chambers of the first hydraulic advance ram during the working stroke of the first hydraulic advance ram.
Abstract:
A multi-core duct is constituted by a plurality of resilient conduits bunched together within a protective sleeve. Each of the conduits is formed from a high-strength synthetic plastics material and the protective sleeve is made of a flame-resistant synthetic plastics material.
Abstract:
A valve device takes the form of a multi-part cartridge with a hollow stepped housing containing a stepped rod. A control piston at one end of the rod is opposed by the force of a main spring in a main chamber remote from the control piston. A valve closure member is axially displaceable relative to the rod. The valve closure member is normally held against a valve seating but pressure on the control piston displaces the rod and causes the valve closure member to be lifted from its seating via stop faces. An auxiliary chamber in the housing leads via a connection to some consumer appliance and forms, the downstream side of the valve. A compensating piston on the rod member opposes a face of the valve closure member open to the auxiliary chamber. A further spring in the auxiliary chamber holds the valve closure member on its seating. The valve can open independently of the control piston should the pressure on the upstream side of the valve exceed the consumer pressure. This upstream side usually leads to either the pressure line or a return line as determined for example, by a change-over valve. The valve closure member will respond reliably to increased pressure on the control piston which only has to overcome predetermined spring force independent of hydraulic pressure in the auxiliary chamber.
Abstract:
A pressure-relief valve device has the stem of a valve member guided within a sealed bore of a guide piece screwed into or onto a sleeve-like housing. A spring in the housing acts on a pressure disk to create closure force on the head of the valve member. A connector, which may provide a plug-in connection to some equipment to be controlled, is in screw-threaded engagement with the guide and can be removed to provide ready access to the valve member without disturbing the remainder of the assembly and its setting. The valve member has a piston opposite the head which fits in a recess in the connector. An end wall of the recess forms a stop limiting the closed position of the valve and an end face of the guide forms a complementing stop face limiting the open position of the valve.
Abstract:
A non-porous hydrogen diffusion membrane, and the utilization thereof for e separation of hydrogen from gas mixtures. The non-porous hydrogen diffusion membrane distinguishes itself in that it is constituted of TiNi or TiAg with an atom ratio of about 1:1. These titanium alloys presently contain about 45 to 55% of atoms of one or the other of the components and are utilized at temperatures in excess of 300.degree. C. in the form of thin sheets of foils.
Abstract:
The invention relates to a method for the simultaneous actuation of a plurality of hydraulic consumers by means of intrinsically-safe electro-hydraulic valves. The consumers are connected by hydraulic directional control valves to a pressure line and/or a return line. These hydraulic directional control valves can be connected in a predetermined manner, via pre-control valves to a control line. The pre-control valves are pressureless, and possess electro-magnets with a current consumption of less than 50 milliamps. By connection of a series-connected electro-hydraulic directional control valve means, the pre-control valves are connected to the control line, and at the same time are hydraulically locked.
Abstract:
A hydraulic connecting device is disclosed, the device being for interconnecting a multi-line hose and a coupling device. The hose has a plurality of flexible hydraulic conduits bunched together within a protective sheath. The coupling device has a plurality of plug pins held within a casing by a retaining disc. The casing is attached to the protective sheath by the connecting device. The connecting device is constituted by a clamping sleeve, which is connected to the protective sheath, and a connecting sleeve, which is connected to the casing. The two sleeves are telescoped together at end portions thereof and are joined together by means of a rotary connection which resists tensile forces. The rotary connection is constituted by a releasable securing element.