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Conversion of the Stroke of Piston Rod in Hydraulic Actuators into an Electrical Signal

将液压执行器中活塞杆的行程转换为电信号

基本信息

批准号：
59850104
负责人：
KOKADO Jun-ichi
金额：
$ 1.66万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1985
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850104/
关键词：
Measurement of length Distance transducer Piston stroke Remote control Magnetic graduations Automatic control 油圧アクチュエータ

项目摘要

The let out length of the piston rod in oil hydraulic actuators is desired to be perceived remotely, for instance by means of a magnitude of electrical signal, in order to command the actuator, and consequently to operate the hydraulic machine system remotely or automatically.This research was aimed at finding out an adequate way to convert the length into an electrical signal. Since the piston rods are made of an alloy steel, a series of magnetic graduations is implanted onto the rod surface in order to make the rod as a kind of magnetic scale stick. An assembly of magnetogalvanic sensors which has been inlaid at collar of the cylinder mouth, produces a series of countable electric voltage pulses as the read out of distance signal. The individual magnetization which composes the each graduation line must be very local without blurring to establish a clear graduations.The interval of each graduations could not be more closer than 40 mm. If it was set more closer than 40 mm, the residual magnetization was forced to be vague by the forthcoming implanting of the graduations. The output of sensor assembly is converted into double phase square voltage waves, whose every transition is detected, and a special logic circuitry performs one-fourth resolution distance in determination of the displacement measurement from the magnetic graduations.The double phase signal waves produce also the direction signal of the motion of piston rod, by which the counting mode can be switched as to count up or to count down.

为了实现对液压作动器的远程控制和液压机械系统的自动控制，需要对液压作动器活塞杆的伸出长度进行远程感知，例如通过电信号的大小来感知，本研究旨在寻找一种将其转换为电信号的方法。由于活塞杆是由合金钢制成的，因此在活塞杆表面植入了一系列磁性刻度，使活塞杆成为一种磁性刻度棒。磁电流传感器组件镶嵌在气缸口的凸缘处，产生一系列可计数的电压脉冲作为距离信号的读出。组成每个刻度线的单个磁化强度必须非常局部，而不会模糊，以建立清晰的刻度。每个刻度的间隔不能比40 mm更近。如果将其设置为比40 mm更近，则剩余磁化强度将因即将植入的刻度而变得模糊。传感器组件的输出信号转换成双相方波电压信号，检测其每一跳变，由专用逻辑电路对磁刻度进行1/4分辨距离的位移测量，并产生活塞杆运动的方向信号，从而实现计数方式的加、减转换。