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在组合机床的液压系统中,通常采用压力继电器实现如定位——夹紧、夹紧——动力头快进、死挡铁停留——快退等顺序动作。 在这些顺序动作中,为了保证工作的稳定可靠,或者有的工步本身就需要有短时间的停留(如刮端面、倒角等),要求系统某点的压力达到压力继电器的调整值之后经过延时再发出下一动作的信号。这个问题目前往往是靠在电气线路中采用延时继电器来解决的。 在运动的转换过程中(如转向、快进转工进等)往往产生压力冲击(压力骤升或突降)。
Hydraulic system in the combination of machine tools, pressure relays are usually used to achieve such as positioning - clamping, clamping - dynamic head fast forward, dead stop - fast rewind and other sequence of actions. In these sequence of actions, in order to ensure a stable and reliable work, or some steps itself need to have a short stay (such as scraping face, chamfer, etc.), the system requires a certain point of pressure to reach the pressure relay after the adjustment value Delay and then send the next action signal. This problem is often solved by using delay relays in electrical circuits. In the process of conversion (such as steering, fast forward, etc.) tend to produce a pressure shock (pressure surge or sudden drop).