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某地下工程打孔用的工具管,由三段两米多长的管子用两副铰链联接而成。铰链是在打孔垂直度发生偏差时,纠偏之用,受力很大。设计要求”每只铰链拉力500吨,两铰链的孔间同心度偏差允许0.04～0.06毫米,孔与轴间的配合间隙为0.08～0.12毫米。铰链结构示意图见图1。铰链底座为35号钢,底板为低碳钢,铰链底座焊在底板上。要求焊后长轴能自由转动,配合尺寸不超出设计要求。
A hole in the underground engineering tools used by the pipe, three long two meters long pipe with two hinges made. Hinge is punched in the vertical deviation, the correction of the use of a great force. Design requirements "Each hinge tension of 500 tons, the two hinges allow concentricity deviation between the hole 0.04 ~ 0.06 mm, the gap between the hole and the axis of 0.08 ~ 0.12 mm. Schematic diagram of the hinge shown in Figure 1. The hinge base is 35 steel , The bottom of the low carbon steel, welded to the bottom of the hinge base requires long axis of freedom after welding rotation, with the size does not exceed the design requirements.