The release of internal devices are cloth, and the sludge pipe, outlet pipe, sludge tank, and transmission system, such as scraper.
内部有释放器、均布器、污泥管、出水管、污泥槽、刮板及传动系统等。
Its function is the same as the spring-type casing scraper, but it can decrease and even avoid that the scraped pipe-column falls in oil well.
作用同弹簧式刮削器，但可减少甚至避免刮削管柱落井。
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