在加工中心或卧镗设计中,为减轻动立柱的重量,主轴箱通常采用液压平衡来代替重锤,传统的液压平衡系统,或是用单独泵长期供油;或是油泵间隙供油,用平衡阀定压和小容量蓄能器补泄来保压。其共同缺点是:油缸动作时泵必须向系统供油。从而影响了它的推广。有的单位不得不改用重锤平 In the machining center or horizontal boring design, in order to reduce the weight of moving columns, the headstock usually adopts the hydraulic balance to replace the heavy hammer, the traditional hydraulic balance system, or the long-term oil supply with the single pump; or the oil pump clearance supply Counterbalance valve fixed pressure and small capacity accumulator to vent pressure to maintain pressure. The common disadvantage is that the pump must supply oil to the system when the cylinder is operating. Thus affecting its promotion. Some units have to switch to heavy hammer flat