苦瓜老太婆
字面的意思是“防错扣螺纹”。
普通螺纹在紧固时,如果进入的角度不对,可能会令螺纹打在不同的平面上、拧了几圈以后就无法再拧进去了。这种情况在茶杯、罐头之类的瓶盖很常见……
防错扣螺纹一般会有一段平滑入口,螺钉伸进去一定距离之后才开始螺纹对接,此时螺钉的角度已经能够保证不发生错扣了。
叔不是学机械的,无法用专业的机械术语进行描述,你凑合着看看、能明白就行了……
南宫style
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