武汉百士自动化设备有限公司

主营:液压元件,气动元件,工控系列,柱塞泵,电磁阀,伺服电机,传感器,伺服模块

R901102360 HED8OH-2X/100K14压力继电器

产品信息

产品详细

R901102360 HED8OH-2X/100K14力士乐压力继电器

武汉百士自动化设备有限公司专注于液压、气动、工控自动化备件销售,热诚欢迎新老客户咨询购买!

1.压力继电器,液压术语,是液压系统中当流体压力达到预定值时,使电接点动作的元件。

2.是将压力转换成电信号的液压元器件,客户根据自身的压力设计需要,通过调节压力继电器,实现在某一设定的压力时,输出一个电信号的功能。

工作原理

压力继电器是利用液体的压力来启闭电气触点的液压电气转换元件。当系统压力达到压力继电器的调定值时,发出电信号,使电气元件(如电磁铁、电机、时间继电器、电磁离合器等)动作,使油路卸压、换向,执行元件实现顺序动作,或关闭电动机使系统停止工作,起安全保护作用等。

压力继电器有柱塞式、膜片式、弹簧管式和波纹管式四种结构形式。下面对柱塞式压力继电器(见图)的工作原理作一介绍:

当从继电器下端进油口3进入的液体压力达到调定压力值时,推动柱塞2上移,此位移通过杠杆放大后推动微动开关4动作。改变弹簧1的压缩量,可以调节继电器的动作压力。

应用场合:用于安全保护、控制执行元件的顺序动作、用于泵的启闭、用于泵的卸荷。

注意: 压力继电器必须放在压力有明显变化的地方才能输出电信号。若将压力继电器放在回油路上,由于回油路直接接回油箱,压力也没有变化,所以压力继电器也不会工作。

2选用标准

根据所测对象的压力来选用,比如所测压力范围在8KG以内,那么就要选用额定10KG的压力继电器,还有要符合电路中的额定电压,接口管径的大小

3使用方法

首先用于安全保护时,将压力继电器设置在夹紧液压缸的一端,液压泵启动后,首先将工件夹紧,此时夹紧液压缸的右腔压力升高,当升高到压力继电器的调定值时,压力继电器动作,发出电信号使2YA通电,于是切削液压缸进刀切削。在加工期间,压力继电器微动开关的常开触点始终闭合。若工件没有夹紧,压力继电器2断开,于是2YA断电,切削液压缸立即停止进刀,从而避免工件未夹紧被切削而出事故。

其实用于控制执行元件的顺序动作时,液压泵启动后,首先2YA通电,液压缸左腔进油,推动活塞方向右移。当碰到限位器(或死挡铁)后,系统压力升高,压力继电器发出电信号,使1YA通电,高压油进入液压缸的左腔,推动活塞右移。这时若3YA也通电,液压缸的活塞快速右移;若3YA断电,则液压缸的活塞慢速右移,其慢速运动速度由节流阀调节。

再次用于液压泵卸荷时,压力继电器不是控制液压泵停止转动,而是控制二位二通电磁阀,将液压泵5输出的压力油流回油箱,使其卸荷。

最后用于液压泵的启闭时,有两个液压泵,高压小流量泵,低压大流量泵。当活塞快速下降时,两泵同时输出压力油。当液压缸活塞杆抵住工件开始加压时,压力继电器在压力油作用下发出动作,触动微动开关,将常闭触点断开,使液压泵停转。在加工过程中减慢液压缸的速度,同时减少动力消耗。

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