如果要监测的压力低于调定压力,则操作微动开关。要监测的压力通过节流孔传到柱塞。柱塞受弹簧座支持并克服压缩弹簧不断变化的作用力。弹簧座将柱塞的运动传输到微动开关,并在达到调定压力时释放后者的压力。这会打开或关闭电路,具体取决于电路设置。弹簧座的机械前挡块在压力突然降低和过压的情况下,可保护微动开关免于受到机械损伤,并防止压缩弹簧的固态压缩。
力士乐压力继电器HED8OA-20/200K14,购买进口液压、气动、自动化控制工业配件,认准“上海韦米机电设备有限公司”,保证原装产品,品质保障,售后无忧,批量零售,价格优惠,常用产品现货供应。欢迎新老客户咨询采购!
在液压设备中,以压力作为控制信号来实现自动化控制的控制方式中,压力继电器是重要的元件之一。它是一种将油液的压力信号中转换成电信号的电液控制元件(液电转换开关)。当液压系统中的油液压力达到压力继电器的调节压力时,即发出电信号,以控制电磁铁,电磁离合器,继电器等电气元件动作,使油路换向卸压。执行机构实现顺序动作,或关闭电机,使系统停止工作,起安全保护作用等。
压力继电器有直动型和先导型;也有带延时调节和不带延时调节的; 也有弹簧调节型和开关位置调节型。各种压力继电器尽管类型不同,原理只有一个,即靠液体压力与弹簧力的平衡,使柱塞或杠杆产生一定的位移,将电气开关接通与断开。压力继电器的任务是把系统某 较稳定的压力信号反映出去, 以控制其它的顺序动作,但它由于自身和外界的原因,有可能发出误信号,影响液压系统的工作可靠性和安全性。
液压传动技术已经广泛应用于很多工程技术领域,由于液压系统所服务的主机的工作循环、动作特点等各不相同,相应的各液压系统的组成、作用和特点也不尽相同。以下通过对几个典型液压系统的分析,进一步熟悉各液压元件在系统中的作用和各种基本回路的组成,并掌握分析液压系统的方法和步骤。
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一,组合机床液压系统
组合机床液压系统主要由通用滑台和辅助部分(如定位、夹紧)组成。动力滑台本身不带传动装置,可根据加工需要安装不同用途的主轴箱,以完成钻、扩、铰、镗、刮端面、铣削及攻丝等工序。
有液压夹紧的他驱式动力滑台的液压系统原理图,这个系统采用限压式变量泵供油,并配有二位二通电磁阀卸荷,变量泵与进油路的调速阀组成容积节流调速回路,用电液换向阀控制液压系统的主油路换向,用行程阀实现快和工进的速度换接。
二,液压系统的特点
液压系统采用限压式变量泵和调速阀组成容积节流调速系统,把调速阀装在进油路上,而在回油路上加背压阀。这样就获得了较好的低速稳定性、较大的调速范围和较高的效率。而且当滑台需死挡铁停留时,用压力继电器发出信号实现快退比较方便。
采用限压式变量泵并在快进时采用差动连接, 不仅使快进速度和快退速度相同差动缸),而且比不采用差动连接的流量可诚小一倍,其能量得到合理利用,系统效率进一步得到提高。
采用电液换向阀使换向时间可调,改善和提高了换向性能。采用行程阀和液控顺序阀来实现快进与工进的转换,比采用电磁阀的电路简化,而且使速度转换动作可靠,转换精度也较高。此外,用两个调速阀串联来实现两次工进, 使转换速度平稳而无沖击。
夹紧油路中串接诚压阀,不仅可使其压力低于主油路压力,而且可根据工件夹紧力的需要来调节并稳定其压力;当主系统快速运动时,即使主油路压力低于减压阀所调压力,因为有单向阀的存在,夹紧系统也能维持其压力(保压)。夹紧油路中采用二位四通阀,它的常态位置是夹紧工件,这样即使在加工过程中临时停电,也不至于使工件松开,保证了操作安全可靠。