| 摘要 |
<p>The nozzles which are set inclined to the pipe wall to be cleaned are mounted in two crowns (7,8) wherein a cylindrical control slider (13) is rotatably mounted on the piston rod (19) and cooperates with the inlet bores (11,12) of the nozzles. The front and rear end faces of the slider (13) have gearing which engages in annular gearing (25,27) of the nozzle head when the slider is in the front and back end positions. The annular gearings (25,27) of the nozzle head are off-set relative to each other in the peripheral direction and as the control slider runs into an end position it is caused to rotate. In this way the front and rear nozzle crown can be alternately supplied with full volume or each nozzle crown supplied simultaneously with partial volume.</p> |
