使用液压传动的工作台因其往复运动平稳,机构簡单,且在一定的速度范圍內能实行无級調速,因而在磨床上的应用愈来愈广泛。运动方向的改变称为換向。液压机床实現换向,主要是借导向閥来控制換向閥的位置,而使系統中油路改变。在液压系統中,工作机构起动后要立刻达到正常的工作是不能的。同样,制动后要立即使运动停止也 The use of hydraulic transmission table because of its smooth reciprocating motion, simple structure, and in a certain speed range can be implemented stepless speed regulation, and therefore more widely used in the grinder. Changes in the direction of movement is called commutation. Hydraulic machine to achieve the commutation, mainly by the pilot valve to control the position of the valve, leaving the system changes in oil. In a hydraulic system, it is not possible to get the work done right after the start of work. Similarly, stop the movement immediately after braking too