基于超前支护设备顶梁支撑结构研究一种恒压支撑装置的设计方法,恒压支撑装置由正刚度线性弹簧、负刚度非线性平面曲梁及承压气囊组合而成.通过对巷道顶板应力场分析,得到支撑结构的边界条件;利用B样条曲线简述负刚度非线性平面曲梁的特点;基于遗传算法与非线性有限元法对负刚度非线性平面曲梁进行形态优化设计;依据恒压支撑装置的工作原理,对线性螺旋弹簧刚度/强度特性进行分析与设计;对恒压支撑装置的零部组件进行设计,实现支撑装置输出压强大小恒定及自我保护功能.恒压支撑装置设计方法为综掘巷道超前支护研制提供了有力技术支撑.
Based on the top beam support structure of advance support equipment,a design method of constant pressure support device is studied.The constant pressure support device is composed of positive stiffness linear spring,negative stiffness nonlinear plane curved beam and pressure bearing air bag.The characteristics of Nonlinear Plane Curved Beam with negative stiffness are briefly described by using B-spline curve.Based on genetic algorithm and nonlinear finite element method,the shape of the nonlinear plane curved beam with negative stiffness is designed and optimized.According to the working principle of constant pressure support,the stiffness and strength properties of the linear coil spring are analyzed and designed.The components of the constant pressure support device are designed to realize the constant output pressure and self-protection function of the support device.The constant pressure support design method proposed in this paper provides strong technical support for the development of advanced support in the fully mechanized mining road.