摘要:在顶驱工作过程中，液压系统起着十分重要的作用，如平衡顶驱主体重量、在上、卸扣时夹紧钻杆以及用于主电机辅助刹车等等。DQ450DBZ直驱顶驱液压系统完全安装于顶驱本体上，无需地面装置。本体上集成了液压站、控制阀组、压力开关及蓄能器等。

　　　从液压系统的控制方式来看，DQ450DBZ顶驱液压系统为一开环控制系统，根据该系统在顶驱上实现的功能不同可将其分为八个部分，分别为液压站、平衡系统、刹车系统、防喷器、背钳、锁销、旋转动力头和吊环倾斜系统。

　　　倾斜油缸是顶驱液压系统的一部分，它的主要有两方面的用途：一是可伸向小鼠洞抓取单根，方便、快捷地实现接单根；二是在接立根时不需要二层台上的井架工将大钩拉靠到二层台上，通过前倾可实现抓取立根操作。

关键词：顶驱系统 控制阀组 倾斜油缸

ABSTRACT:In the working process of  the top drive，hydraulic system plays a very important role,for the main top drive weight balance,In the last, shackle clamping drill pipe and for the main motor auxiliary brake etc.DQ450DBZ direct drive top drive hydraulic system is installed on the top drive.did not ground device.The body integrate hydraulic station, control valve, pressure switch and accumulator.

　　　From the view of the control mode of hydraulic system,DQ450DBZ top drive hydraulic system is an open loop control system.Different can be divided into eight parts according to the system is implemented in the top drive function,Respectively, hydraulic station, balance system, brake system, blowout preventer, the back clamp, pin, rotary power head and ring tilt system.

　　　Tilt cylinder is a part of the top drive hydraulic system,It is mainly used in two ways:One is to grasp a mouse hole, conveniently, quickly realize single,the other is The root does not need the derrick man two layer on the big hook on to the two layer table can be realized by leaning forward, grasping the vertical root operation.

Keywords:top drive system  control valve group  Tilt cylinder