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美国费尔查尔德公司MARK—22A型薄煤层连续采煤机的滚筒摆动液压系统中,采用了一种新型压力补偿流量阀,其液压系统如图1所示。按MARK—22A采煤机割煤方法,设在机器截割部的双滚筒需绕中心O相对机器行走部左右摆动,最大摆动角度为±45°。摆动由两个摆动油缸10和11的同时伸缩来实现。油缸活塞杆端部和油缸底部分别铰接在截割部和行走部上。为了达到采煤机最大合理生产能力;改善截齿受力状况,提高截齿工作寿命;降低割煤过程中滚筒与煤壁之间的摩擦损失,要求割煤切削厚度在切削过程中保持均匀,即滚筒的摆动速度应保持稳定,不受切削阻力的影响。因此在摆动油缸液压回路中设置了由压力补偿流量阀1、5,压力阀
US Fairchild company MARK-22A thin coal continuous drum sheller hydraulic system, the use of a new type of pressure compensation flow valve, the hydraulic system shown in Figure 1. According to the MARK-22A coal shearer cutting method, the double drum located at the cutting section of the machine needs to be swung about the center O relative to the machine running section with a maximum swing angle of ± 45 °. Swinging is achieved by the simultaneous telescoping of the two oscillating cylinders 10 and 11. Cylinder piston rod end and the bottom of the cylinder were hinged on the cutting and walking parts. In order to achieve the maximum reasonable production capacity of shearer; improve the stress conditions of picks and improve the service life of picks; reduce the friction loss between the drum and the coal wall in the process of cutting coal, require the cutting thickness of cutting coal to be uniform during the cutting process, That is, the swing speed of the drum should be stable without being affected by the cutting resistance. Therefore, the swing cylinder hydraulic circuit set by the pressure compensation flow valve 1,5, the pressure valve