| 摘要 |
An improvement of the duct-cleaning unit is disclosed for scraping the deposits from the inner surface of the flow line, which are residual in the flow lines after the completion of conveyance of any fluid material to thereby clean the flow lines as well as recover the material left in the tubing. The improvement is comprised of a pair of spherical guiding bodies coupled to lengthwise opposing ends of a connector member, one to each end, through universal joints. The spherical guiding bodies are each provided at the location near the connector with an annular pressure-carrying surface that makes fluid-tight contact at its outermost periphery with the inner surface of the tubing. The design of the present invention may make the cleaning unit smaller in size, so that the residual deposits in flow lines, in particular, at the relatively small radius bent in the flow line, may be reliably removed and pumped out the flow lines with the result of the high efficiency in cleaning process.
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