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为方便８Ｇ型机车的架修，设计一种用于拐臂拆卸的专用工具——拐臂拆卸器。介绍该工具的结构、主要技术参数及工作原理。
In order to facilitate the repair of the 8G locomotive, a special tool for the crank arm disassembly is designed. Describe the structure of the tool, the main technical parameters and working principle.