Now appears a sort of plastic expansion shell bolt, which has strong expansion anchor-hold.
为了解决这一问题，出现了一种具有强胀锚力的塑料胀壳式锚杆。
The calculation method for bolt pretightening force of tube side gasket and shell side gasket was proposed.
提出了管侧垫片和壳侧垫片螺栓预紧力的计算方法。
This paper propose the new mechanism of bolt welding, and the design of clamping yokes for hilt welding of electromagnetic switch shell.
提出了螺栓焊的新机理和螺栓设计原则。 设计了电磁开关壳体螺栓焊的焊接模具；
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