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本文所提及的是支撑掩护式或掩护式液压支架,这类支架通过顶梁来承受巷道围岩压力,当外力的合力点作用在顶梁一侧时,掩护梁和四连杆处于受扭状态,由于四连杆轨迹是双扭线及顶梁与掩护梁铰接点孔隙的原因,当顶梁承载让压时,掩护梁两端可视为自由端,所以,掩护梁和四连杆的受扭可认为属纯扭状态。 T_1—作用在顶梁上的扭矩。T_1=RL_1=Q_1L_2=Q_2L_2,R指工作阻力,Q_1及Q_2指顶梁与掩护梁铰接点反力,R、Q_1、Q_2由平衡方程求出; T_2—作用在掩护梁上的扭矩。 T_2=T_1cosβ。 T_3—作用在前连杆上的扭矩; T_4—作用在后连杆上的扭矩; T_(cp)—作用在四连杆上总扭矩; T_(cp)=T_2cosω_(cp)=T_2cos((ω+ω_2)/2) ω_1—前连杆与掩护梁夹角; ω_2—后连杆与掩护梁夹角; ω_(cp)—四连杆总扭矩中心线与掩护梁夹角;
This article refers to the support cover or cover type hydraulic support, such support through the roof beam to withstand the pressure of surrounding rock, when the force of the force acting on the side of the roof beam, the shield beam and the four-link in the torsion State, because the four-link trajectory is the reason that the double twist line and the hinge point between the top beam and the shield beam cause the beam to bear pressure, both ends of the shield beam can be regarded as free ends. Therefore, the shield beam and the four- Torque can be considered pure torsion state. T_1 - torque acting on the roof beam. T_1 = RL_1 = Q_1L_2 = Q_2L_2, R refers to the working resistance, Q_1 and Q_2 refer to the reaction force between the hinge of the roof beam and the shield beam, R, Q_1 and Q_2 are determined by the balance equation; T_2 is the torque acting on the shield beam. T_2 = T_1cosβ. T_3 - torque acting on the front link; T_4 - torque acting on the rear link; T_ (cp) - total torque acting on the four-link; T cp = T 2 cos ω cp = T 2 cos ω, + ω_2) / 2) ω_1-angle between front linkage and shield beam; ω_2-angle between rear linkage and shield beam; ω_ (cp) -the angle between centerline of four-