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一、前言 我国目前的1.2kw手持式煤电钻的电机,多年未进行过改进,实践证明,这些煤电钻用于半煤岩巷打眼时,存在以下的:
I. Preface The current 1.2kw hand-held coal electric drill motor in our country has not been improved for many years. Practice has proved that when these coal electric drills are used to drill holes in semi-coal rock lanes, there are the following problems: