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从运动学和力学的角度分析了二柱掩护支架支护特性及其平衡千斤顶损坏机理。指出平衡千斤顶能起的作用不仅取决于支架的支护特性，而且还取决于使用单位的选型、操纵和维护等因素
From the perspective of kinematics and mechanics, the supporting characteristics of two-column shield support and the failure mechanism of the balanced jack are analyzed. It is pointed out that the function of the balance jack depends not only on the support characteristics of the support but also on the selection, manipulation and maintenance of the use unit