Some papers have put forward the lateral scraping action results of the roller bits, which are quantitatively inaccurate and qualitatively defective.
一些文献就不同结构的钻头各有何种横向刮凿作用的问题提出的答案，既不能准确定量，在定性概念上也有严重缺点。
CQJ series hydraulic shovelling-type cleaning machine for ore-car has three models according to its action principle, which are pushing-type, raking-type and scraping-tin respectively.
CQJ系列三种型号液压铲式清车机的动作原理，分别为推卸式、扒卸式和铲削式。
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