This paper presents a nonuniform slap door, whose top hinge refrains from impact when the door is opened and the head loss of the water is zero when the door running steady.

本文提出一种新的非均质拍门，可使拍门在启门时顶铰免受冲力，在稳定运行时拍门水头损失为零。

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This solid wood box features a brushed metal disk on top where the hinge is.

这实木盒采用了顶部的铰链在拉丝金属盘。

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The reforming basic structure of HDJA-1000 metal hinge top beam is introduced. Its various functions, better economy, stability and safety are expounded.

介绍了HD JA - 1000型金属铰接顶梁的改造基本结构，阐述了改造后在采煤工作面应用的多种功能，及其经济性、可靠性和安全性。

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