在前开口井架前大腿的稳定计算理论中一直没有很好的解决井架横截面框架中斜拉杆的作用。

The problem of the effect of oblique tension link on the derricks' cross section frame in the front leg stability calculation of open front derricks remains unsolved.

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底盘总成，前立架，后立架，后压板，拉杆。

Chassis Assembly, Front Vertical Shelf, Back Vertical Shelf, Back Pressure Panel, Rod.

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并用前模拉料销、限位拉杆和尼龙开闭器控制开模运动顺序，实现了浇注凝料的自动脱模。

Fixed mould puller pins, stop drag-bars and nylon shutters were used to open the mould sequentially.

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