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AssigneeVoest-Alpine Aktiengesellschaft
InventorsAlfred Zitz, Otto Schetina, Herwig Wrulich
Estimating the term…
An assembly for cooling the teeth of the cutting heads of a mining machine and, at the same time, the rock face. The cutting heads are rotatably supported and, at the same time, the rock face, the axis of rotation being essentially horizontal. Cooling is performed by water jets distributed by spray nozzles. In order to obtain a sufficient cooling effect for the cutting teeth and the rock face with a water consumption as low as possible, there are provided on the jib arm two groups of spray nozzles for each cutting head. The nozzles of the first group are directed to the region of the teeth in the highest position of the same while the nozzles of the second are directed into the interspaces between the rows of teeth in the said region. The flow of water can be shut off separately for each group of nozzles associated with each of the cutting heads. Since with a mining process in horizontal lines only one cutting head contacts the mining face, in this case flow of water is permitted only to the cutting head which is actually working. Water supply can be shut off separately for each of the two cutting heads.
An assembly for cooling the teeth of a cutting head and the rock face, with the cutting heads rotating about an essentially horizontal axis and being supported on a pivotable jib arm, the rotation axis being transverse to the longitudinal extension of the said jib arm, the rotating sense being selected preferably in such a direction that the teeth turned toward the rock move from above downwards while a water supply and water nozzles are provided and a pair of cutting heads are positioned on either side of the jib arm, the teeth of these cutting heads being distributed in a plurality of circumferential rows axially distant from one another and each row comprising a plurality of teeth, the said assembly being characterized in that for each of the two cutting heads two groups of spray nozzles are provided on the jib arm, that the nozzles of the first group are directed onto the highest region of the teeth rows extending vertically to the cutting head axis while the nozzles of the second group are directed onto the interspace between the teeth rows and at the highest region of the teeth, that valve means is provided for selectively connecting and disconnecting the water supply for either of the groups of nozzles and for selectively connecting and disconnecting the water supply for all the nozzles associated with each cutting head.
In a mining machine having a jib arm which carries a pair of rotary cutting heads positioned on opposite sides of the jib arm, each cutting head having a plurality of axially spaced-apart circumferential rows of cutting teeth:
Dependencies are inferred from the claim text.