...拧紧力；应变电测量；应变分布规律 [gap=1278]Key words：Second sacral pedicle fixation; Outside pedicle screw; Tightening force; Measurement of electric strain;Contingency distribution ..
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通过试验，同步测出拧紧力矩T和轴向预紧力F的值。
The values of the tightening moment P and axial Pretightening force F Can be measured synchronously.
通过弹 簧的自动拧紧力调整清扫件与皮带的间隙，确保效果。
The spacing between the cleaning element and the belt is adjusted through the automatic tightening of the spring, whereby the effects are ensured.
连接时本发明特殊结构，箱与箱的压紧力比原螺栓拧紧力增大2.5倍，因此连接强度很大，有利于运输的安全。
Comparing prior art, the invention increases packing force 2.5 times. Large bonding strength is in favor of safety of transportation.
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