针对现场的需要，设计制备了一种以改性MC尼龙为原材料的护顶铰接顶梁。
In view of the worksite demand, a noosing cross beam for the lop protection was designed with MC nylon as raw material.
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。
The reforming basic structure of HDJA-1000 metal hinge top beam is introduced. Its various functions, better economy, stability and safety are expounded.
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