| 摘要 |
<p>In a spin-blast apparatus for cleaning the interior of a pipe, in which abrasive is fed to a rotary blast nozzle caused to travel interiorly along the pipe, and in which the nozzle is mounted on a support conduit journalled for rotation within a non-rotating housing by bearings, the intake end of the support conduit bears against a sealing gasket which is supported by clamping means in such a way as to prevent excessive leakage of abrasive past the gasket. The clamping means is spaced from the end of the housing so as to define therewith a space which is open to atmosphere; thus, any abrasive which leaks past the gasket will fall from the apparatus and will not be forced under air pressure into the bearings.</p> |
