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介绍一种利用杂质收取器清除精煤中软杂质的方法，杂质收取器由液压控制装置控制，能自动跟随床层上下移动，从而使杂质收取器保持恒定的截取深度，达到有效清除杂质的目的。
A method for removing soft impurities in clean coal by using an impurity extractor is introduced. The impurity extractor is controlled by a hydraulic control device and can automatically move up and down following the bed so as to keep a constant interception depth of the extractor so as to effectively remove impurities.