起下钻之前，检查一下天车防碰木是否在原位。
Prior to trip, check if the crown bumper blocks are in place.
介绍了一种电子式天车防碰装置的结构及工作原理、软硬件的设计。
The structure, working principle, design of software and hardware of an electronic hit-against device are introduced.
介绍了一种电子式天车防碰装置的结构及工作原理、软硬件的设计。
The structure, working principle, design of software and hardware of an electronic hit-against device are introduced.
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