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A Cutting Machine Fluid Control Valve

IP.com Disclosure Number: IPCOM000239451D
Publication Date: 2014-Nov-07

Publishing Venue

The IP.com Prior Art Database

Related People

Sandvik Mining and Construction G.m.b.H.: OWNER

Abstract

A liquid supply apparatus to provide a spray of a liquid to a region of a cutting head of a mining machine. The apparatus comprises a plurality of spray nozzles, a conduit network to provide a pathway for a flow of pressurised liquid to the nozzles and a control unit to provide a pulsing or phasing of the supply liquid and respective control valves. The control valves are mounted at respective pick holders and comprise a resiliently biased shuttle obstruction to move between an open and close position in direct response to the supply of pressurised liquid to each valve.

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A Cutting Machine Fluid Control Valve

The present invention relates to liquid supply apparatus to provide a spray of a liquid at a

region of a cutting head of a cutting machine to suppress the generation of airborne dust as the cutter engages rock or a material deposit.

Background art

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A variety of different methods and machines have been developed to extract minerals and other valuable materials at and below the Earth's surface. Such machines typically operate in mines at great depths. In order to maximise excavation and mineral recovery efficiency, mining machines have been developed for specific purposes. Whilst some machines are configured exclusively to cut the mineral from a deposit or seam, other machines are

configured to tunnel within the subterranean depth to effectively create the mine and provide passageways for the mineral cutters. In particular, mobile mining machines have emerged as successful apparatus to both provide direct cutting at the seam and as a means of rapid entry roadway development. Typically a mobile mining machine comprises a rotatable cutting or mining head having cutting picks provided on rotating head sections to

subsequent extraction from the mine.

Conventionally, water spray nozzles are mounted at the cutting head to suppress the generation of airborne dust that is otherwise created around the miner and provides a very unpleasant working environment for personnel. The water spray also acts to cool the

cutting picks and extend their operational lifetime and reduces the risk of exploitations due to a methane ignition. Water is fed to the spray nozzles during rotation of the cutter head

Field of invention

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contact the mineral face. The cutting head is conventionally mounted at a moveable boom so as to be adjustable in height relative to the mine floor as well as being moveable laterally in a sideways direction. As the cutting head is rotated and advanced into the seam, the extracted mineral is gathered by a gathering head and then conveyed rearwardly by the mobile machine via conveying apparatus to create discharged stock piles for

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so as to suppress the dust instantaneously as the picks are forced into the rock. A variety of different fluid supply and spray assemblies have been proposed to both provide a controlled supply of water to the spray nozzles and generate a spray sufficient for dust suppression. Example systems are disclosed in GB 1,110,763; EP 0111143; DE 386651, US 4,721,341; US 4,852,947; GB 2333548 and US 6,070,944.

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However, one disadvantage with existing fluid supply systems is the problematic initial start-up behaviour of the spraying system that is very dependent on air ingress into the system. In particular, due to the many spray nozzles and often complex internal routing and components of the fluid supply network within the cutting head, it is common for the water

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in the head to undesirably drain from the system when the head is not rotat...