手孔是指用于人的手或工具伸入设备以便安装、检修或检查的开孔结构。主要由短管、法兰和带把手的手孔盖组成。常用手孔的公称直径为150〜250mm，手孔材料有碳钢和不锈钢。手孔按受压情况分为常压和受压手孔；按开启速度分为普通和快开式手孔。快开手孔用于经常开启场合并分常压、旋柄和迥转盖手孔。
在浓缩罐下部设置了快开式手孔，以使清理罐内残液，残渣；
Quick-open hand hole is set at lower part of the concentrator to clear residual liquid and slag inside the concentrator.
奥卡利那笛，洋埙一种小的赤陶制成或塑料乐器，有手孔和吹口，加长的椭形。
A small terra-cotta or plastic wind instrument with finger holes a mouthpiece and an elongated ovoid shape.
分别对凸轮靠模和曲柄滑块机构作为工装加工椭圆手孔盖的原理及特点进行了探讨。
The paper respectively studies the principles and features for profiling attachment and slider crank mechanism to be used as clamping apparatus to fabricate oval hand hole cover.
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