| 摘要 |
The invention relates to an improved device for cutting rock, with a nozzle head arranged on a supply line for a medium which flows out under high pressure and with a fixed pivoting angle, with a flexible high-pressure hose as a supply line to the nozzle head as well as a guide with stops, according to DE-PS 3410981, characterised in that the nozzle head (3) has in a chamber (7) between nozzle(s) (5) and the end of the supply line (1) a rigidly mounted magnetic bar (8) and a movable ball (9), as well as on its ball side a bore (10), as well as its use for breaking hard materials in mining, in particular in coal and rock-salt mines for obtaining coal and salt blocks of desired size and for cleaning and/or roughening the surfaces of structures. <IMAGE>
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