有针对性地设计制造了液压支架的底座镗孔机和掩护梁镗孔机。
This paper is targeted to the design and manufacture of hydraulic support base boring machine and a shield.
作者把掩护梁和前、后连杆一起考虑，引出掩护梁和前、后连杆组成的虚拟系统。
The author derives a virtual system of debris shield and the front and rear linkage.
作者把掩护梁和前、后连杆一起考虑，引出掩护梁和前、后连杆组成的虚拟系统。
The author derives a virtual system of debris shield and the front and rear linkage.
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