WO2022083079A1 - 液压缸伸长量检测装置 - Google Patents

液压缸伸长量检测装置 Download PDF

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Publication number
WO2022083079A1
WO2022083079A1 PCT/CN2021/087348 CN2021087348W WO2022083079A1 WO 2022083079 A1 WO2022083079 A1 WO 2022083079A1 CN 2021087348 W CN2021087348 W CN 2021087348W WO 2022083079 A1 WO2022083079 A1 WO 2022083079A1
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WIPO (PCT)
Prior art keywords
scale
hydraulic cylinder
magnetic ring
magnet fixing
fixing structure
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PCT/CN2021/087348
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English (en)
French (fr)
Inventor
陈新春
蹤雪梅
王灿
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江苏徐工工程机械研究院有限公司
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Application filed by 江苏徐工工程机械研究院有限公司 filed Critical 江苏徐工工程机械研究院有限公司
Priority to US18/033,073 priority Critical patent/US20230392619A1/en
Priority to JP2023522810A priority patent/JP2023545311A/ja
Priority to DE112021005553.4T priority patent/DE112021005553T5/de
Publication of WO2022083079A1 publication Critical patent/WO2022083079A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for

Definitions

  • the invention relates to the technical field of elongation detection, in particular to a hydraulic cylinder elongation detection device.
  • Hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into linear motion mechanical energy. It is widely used in engineering machinery, machine tools, marine machinery and other industrial fields. Hydraulic cylinder elongation detection is the key technical basis for intelligent control of industrial equipment. In recent years, hydraulic cylinder elongation detection has received extensive attention. The traditional method has the following problems: first, it is placed outside the hydraulic cylinder, which is easy to damage and has poor environmental adaptability; second, the structure is complex, the manufacturing cost is high, and the installation is inconvenient; third, the material cost is high, the assembly is time-consuming and labor-intensive, and the vibration resistance is poor.
  • the purpose of the present invention is to provide a hydraulic cylinder elongation detection device, which is placed inside the hydraulic cylinder and has strong environmental adaptability, simple structure, easy implementation, low manufacturing cost and strong vibration resistance.
  • Hydraulic cylinder elongation detection device including:
  • the electrical signal conversion device is placed at the bottom of the cylinder;
  • a ruler one end is fixedly connected with the electrical signal conversion device, and the other end is movably extended into the piston rod;
  • a position magnetic ring which is fixedly connected to the piston, and the position magnetic ring is movably sleeved on the outer peripheral side of the scale;
  • the conduction of different circuits can be realized, and the voltage or current signal corresponding to the position of the scale can be transmitted to the electrical signal conversion device, so as to obtain the position of the magnetic ring at the position.
  • the position on the scale is described, and then the extension length of the piston rod is obtained.
  • the scale is composed of a conductive tube and an electromagnetic induction device, and the electromagnetic induction device is placed in the conductive tube; one end of the conductive tube is fixed at the bottom of the cylinder, and is fixedly connected with the electrical signal conversion device, The other end is placed in the shaft hole of the piston rod.
  • one end of the conductive tube placed in the axial hole of the piston rod is closed and arranged.
  • the electromagnetic induction device is composed of a printed circuit board and a tunnel magnetoresistance sensor chip placed on the printed circuit board; the printed circuit board is placed in the inner hole of the conductive tube and is parallel to the axis of the conductive tube .
  • the printed circuit board is connected with a support to prevent it from being bent in the conductive tube.
  • an elastic support ring is selected for the support member.
  • tunnel magnetoresistive sensor chips are distributed at equal intervals in a single row on the printed circuit board or in multiple rows at equal intervals, or are distributed at equal intervals only in the working stroke range of the piston rod.
  • the tunnel magnetoresistance sensor chip is composed of a first ferromagnetic layer, a non-magnetic insulating layer, and a second ferromagnetic layer; the tunnel magnetoresistance sensor chip is under the action of the position magnetic ring magnetic field, if the first ferromagnetic If the magnetization directions of the layer and the second ferromagnetic layer are parallel, they are in a low impedance mode, and the circuit is in a conducting state, so that the circuit corresponding to the position of the scale where the magnetic ring is located is conducted, and the electrical signal conversion device is transmitted to the electrical signal conversion device. The voltage or current signal corresponding to the ruler position.
  • the position magnetic ring is composed of a magnet fixing structure and a magnet placed on the annular magnet fixing structure; the magnet fixing structure is fixedly connected with the piston and is coaxial with it, and the magnet fixing structure is connected to the scale. It is coaxial and can slide axially along the scale under the driving of the piston.
  • the magnet fixing mechanism is annular, the magnets are evenly distributed on the magnet fixing structure, and the magnet fixing structure is fixed in the piston and movably sleeved on the outer circumference side of the scale.
  • the utility model has the advantages of simple structure, easy realization, wide application range, convenient adjustment, and flexible adaptive action.
  • FIG. 1 is an assembly diagram of a hydraulic cylinder elongation detection device and a hydraulic cylinder in an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a ruler in an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram 1 of a bar-shaped electromagnetic induction device in an embodiment of the present invention.
  • FIG. 4 is a second structural schematic diagram of a bar-shaped electromagnetic induction device in an embodiment of the present invention.
  • FIG. 5 is a third structural schematic diagram of a bar-shaped electromagnetic induction device in an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a position magnetic ring in an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a magnetoelectric principle for elongation detection in an embodiment of the present invention.
  • the present invention provides a hydraulic cylinder elongation detection device, including an electrical signal conversion device 1, a ruler 2, a position magnetic ring 3, a piston 4, a cylinder barrel 5, a piston rod 6, a stainless steel tube 7, a bar
  • the electromagnetic induction device 8 the strip-shaped printed circuit board 9 , the tunnel magnetoresistance sensor chip 10 , the magnet 11 , and the ring-shaped magnet fixing structure 12 .
  • the electrical signal conversion device 1 is used to transmit the voltage or current signal in the bar-shaped electromagnetic induction device 8 to the controller, and calculate and display the extension length of the piston rod 6 .
  • the scale 2 is composed of the stainless steel tube 7 and a bar-shaped electromagnetic induction device 8. One end of the scale 2 is fixed at the bottom of the cylinder 5 and is fixedly connected with the electrical signal conversion device 1; the other end of the scale 2 is fixed. It is placed in the axial hole of the piston rod 6, and its outer circle is sleeved in the inner cylindrical surface of the position magnetic ring 3 and is coaxial with it.
  • the position magnetic ring 3 includes the magnet 11 and the annular magnet fixing structure 12 ; the position magnetic ring 3 is fixedly connected with the piston 4 and coaxial with it; the position magnetic ring 3 and the scale 2 It is coaxial and can slide axially along the scale 2 under the driving of the piston 4 .
  • the piston 4, the cylinder 5, and the piston rod 6 are the basic components of the hydraulic cylinder.
  • One end of the stainless steel tube 7 is fixed at the bottom of the cylinder 5, the other end of the stainless steel tube 7 is placed in the axial hole of the piston rod 6, and its outer circle is sleeved in the inner cylindrical surface of the position magnetic ring 3 and is parallel to the cylinder.
  • the stainless steel pipe 7 is coaxial with the piston rod 6 ; the other end of the stainless steel pipe 7 is closed to prevent hydraulic oil from entering the inner hole of the stainless steel pipe 7 .
  • the strip-shaped electromagnetic induction device 8 is composed of the strip-shaped printed circuit board 9 and the tunnel magnetoresistance sensor chip 10; the strip-shaped electromagnetic induction device 8 is placed in the inner hole of the stainless steel tube 7, and is connected with the The axis of the stainless steel tube 7 is parallel; the strip-shaped electromagnetic induction device 8 is provided with elastic support rings at equal intervals ( ⁇ 200mm) to ensure that it does not bend in the stainless steel tube 7 .
  • the strip-shaped printed circuit board 9 is placed in the stainless steel tube 7, and the tunnel magnetoresistance sensor chips 10 are arranged thereon; the tunnel magnetoresistance sensor chips 10 can be distributed in a row at equal intervals.
  • the tunnel magnetoresistance sensor chip 10 is composed of a sandwich structure of a first ferromagnetic layer, a non-magnetic insulating layer, and a second ferromagnetic layer.
  • the circuit In parallel, it is in a low impedance mode, and the circuit is in a conducting state; otherwise, the circuit is in a non-conducting state; the tunnel magnetoresistance sensor chip 10 is under the action of the position magnetic ring 3, so that the circuit is in a conducting state, and then The circuit corresponding to the position of the scale 2 where the position magnetic ring 3 is located is turned on, and a voltage or current signal corresponding to the position of the scale is transmitted to the electrical signal conversion device 1 .
  • the magnets 11 are evenly arranged on the ring-shaped magnet fixing structure 12 on the circumference, and the magnetic field lines along the axial direction are formed in the cylindrical surface space of the magnetic ring 3 at the position.
  • the ring-shaped magnet fixing structure 12 is in the form of a circular ring, and the magnets 11 are evenly distributed on the upper circumference thereof, fixed in the piston 4 , and sleeved on the scale 2 .
  • the position magnetic ring 3 is located at different positions of the tunnel magnetoresistive sensor chip 10 of the scale 2 , so that different circuits are turned on, and the corresponding position of the scale 2 is transmitted to the electrical signal conversion device 1 .
  • the voltage or current signal is obtained, the position of the position magnetic ring 3 on the scale 2 is obtained, and then the extension length of the piston rod 6 is obtained.
  • the resistors in the circuit are R1, R2, R3, R4 respectively.
  • the voltage or current signals of the position magnetic ring 3 at different positions of the tunnel magnetoresistance sensor chip 10 are used to detect the extension length of the piston rod 6 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)

Abstract

液压缸伸长量检测装置，包括电信号转化装置（1）、标尺（2）、位置磁环（3）；电信号转化装置（1）置于缸筒（5）的底部，标尺（2）一端与电信号转化装置（1）固定连接，另一端活动延伸至活塞杆（6）内，位置磁环（3）固定连接在活塞（4）上，且位置磁环（3）活动套接在标尺（2）的外周侧，当位置磁环（3）处于标尺（2）的不同位置时，可实现不同电路的导通，向电信号转化装置（1）传输标尺（2）位置对应的电压或电流信号，获得位置磁环（3）在标尺（2）上的位置，进而获得活塞杆（6）的伸出长度。

Description

液压缸伸长量检测装置 技术领域
本发明涉及伸长量检测技术领域，特别涉及液压缸伸长量检测装置。
背景技术
液压缸是一种将液压能转变为直线运动机械能的液压执行元件，被广泛应用于工程机械、机床、海工机械等工业领域。液压缸伸长量检测是工业装备智能控制的关键技术基础。近年来，液压缸伸长量检测得到了广泛的关注。传统方法存在以下问题：一是置于液压缸外部，易损伤，环境适应性差；二是结构复杂，制造成本高，安装不便；三是材料成本较高，装配耗时耗力，抗振差。
发明内容
本发明的目的是提供液压缸伸长量检测装置，本装置置于液压缸内部，环境适应性强，结构简单、易于实现，制造成本低、抗振性强。
本发明的上述技术目的是通过以下技术方案得以实现的：
液压缸伸长量检测装置，包括：
电信号转化装置，置于缸筒的底部；
标尺，一端与所述电信号转化装置固定连接，另一端活动延伸至活塞杆内；
位置磁环，固定连接在活塞上，且所述位置磁环活动套接在所述标尺的外周侧；
当所述位置磁环处于所述标尺的不同位置时，可实现不同电路的导通，向所述电信号转化装置传输所述标尺位置对应的电压或电流信号，获得所述位置磁环在所述标尺上的位置，进而获得活塞杆的伸出长度。
进一步地，所述标尺由导电管、电磁感应装置组成，所述电磁感应装置置于所述导电管内；所述导电管一端固定在缸筒的底部，并与所述电信号转化装置固定连接，另一端置于活塞杆轴心孔内。
进一步地，所述导电管置于活塞杆轴心孔内的一端封闭设置。
进一步地，所述电磁感应装置由印刷电路板及置于所述印刷电路板上的隧道磁电阻传感器芯片组成；所述印刷电路板置于所述导电管内孔中并与所述导电管轴线平行。
进一步地，所述印刷电路板连接有避免其在所述导电管内发生弯曲的支撑件。
进一步地，所述支撑件选用弹性支撑环。
进一步地，所述隧道磁阻传感器芯片在所述印刷电路板上单排等间距分布或多排交叉等间距分布或仅在活塞杆工作行程范围等间距分布。
进一步地，所述隧道磁电阻传感器芯片由第一铁磁层、非磁绝缘层、第二铁磁层叠加组成；所述隧道磁电阻传感器芯片在位置磁环磁场作用下，若第一铁磁层、第二铁磁层磁化方向平行，则处于低阻抗模式，电路处于导通状态，进而使得所述位置磁环所处标尺位置对应的电路导通，向所述电信号转化装置传输所述标尺位置对应的电压或电流信号。
进一步地，所述位置磁环由磁铁固定结构及置于所述环状磁铁固定结构上的磁铁组成；所述磁铁固定结构与活塞固定连接并与其同轴，所述磁铁固定结构与所述标尺同轴，在活塞驱动下可沿所述标尺轴向滑动。
进一步地，所述磁铁固定机构呈圆环状，所述磁铁圆周均布在所述磁铁固定结构上，所述磁铁固定结构固定在活塞内并活动套接在所述标尺的外周侧。
本发明的有益效果如下：
结构简单、易于实现，适用范围广、调整方便，自适应动作灵活。
附图说明
图1为本发明实施例中的液压缸伸长量检测装置及液压缸的装配图；
图2为本发明实施例中的标尺的结构示意图；
图3为本发明实施例中的条形电磁感应装置的结构示意图一；
图4为本发明实施例中的条形电磁感应装置的结构示意图二；
图5为本发明实施例中的条形电磁感应装置的结构示意图三；
图6为本发明实施例中的位置磁环的结构示意图；
图7为本发明实施例中的伸长量检测磁电原理图。
具体实施方式
以下结合附图对本发明作进一步详细说明。
需要说明，本发明实施例中所有方向性指示(诸如上、下、左、右、前、后…)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。此外，术语“安装”、“设置”、“设有”、“连接”、“相连”、“套接”应做广义理解。例如，可以是固定连接，可拆卸连接，或整体式构造；可以是机械连接，或电连接；可以是直接相连，或者是通过中间媒介间接相连，又或者是两个装置、元件或组成部分之间内部的连通。对于本领域普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
参照图1至图7，本发明提供液压缸伸长量检测装置，包括电信号转化装置1、标尺2、位置磁环3、活塞4、缸筒5、活塞杆6、不锈钢管7、条形电磁感 应装置8、条形印刷电路板9、隧道磁电阻传感器芯片10、磁铁11、环状磁铁固定结构12。
所述电信号转化装置1用于将所述条形电磁感应装置8中的电压或电流信号传输给控制器，计算显示所述活塞杆6伸出长度。所述标尺2由所述不锈钢管7、条形电磁感应装置8组成，所述标尺2一端固定在所述缸筒5底部，与所述电信号转化装置1固连；所述标尺2另一端置于所述活塞杆6轴心孔内，其外圆套在所述位置磁环3内圆柱面中并与其同轴。所述位置磁环3包括所述磁铁11与所述环状磁铁固定结构12；所述位置磁环3与所述活塞4固连并与其同轴；所述位置磁环3与所述标尺2同轴，在所述活塞4驱动下可沿所述标尺2轴向滑动。
所述活塞4、所述缸筒5、所述活塞杆6是液压缸的基本组成结构。所述不锈钢管7一端固定在所述缸筒5底部，所述不锈钢管7另一端置于所述活塞杆6轴心孔内，其外圆套在所述位置磁环3内圆柱面中并与其同轴；所述不锈钢管7与所述活塞杆6同轴度；所述不锈钢管7另一端封闭，防止液压油进入所述不锈钢管7内孔。所述条形电磁感应装置8由所述条形印刷电路板9、所述隧道磁电阻传感器芯片10组成；所述条形电磁感应装置8置于所述不锈钢管7内孔中，与所述不锈钢管7轴线平行；所述条形电磁感应装置8等间距(<200mm)设置弹性支撑环，确保其在所述不锈钢管7中不发生弯曲。所述条形印刷电路板9置于所述不锈钢管7中，其上布置有所述隧道磁阻传感器芯片10；所述隧道磁阻传感器芯片10可以一排等间距分布，为了提高检测精度还可以多排交叉等间距分布，为了节约成本还可以非等间距分布，即仅在所述活塞杆6工作行程范围等间距分布。所述隧道磁电阻传感器芯片10由第一铁磁层、非磁绝缘层、第 二铁磁层的三明治结构组成；所述隧道磁电阻传感器芯片10在外部磁场作用下，若铁磁层磁化方向平行，则处于低阻抗模式，电路处于导通状态，反之，则电路处于非导通状态；所述隧道磁电阻传感器芯片10在所述位置磁环3作用下，使得电路处于导通状态，进而使得所述位置磁环3所处所述标尺2位置对应的电路导通，向所述电信号转化装置1传输所述标尺位置对应的电压或电流信号。所述磁铁11圆周均匀地布置在所述环状磁铁固定结构12上，在所述位置磁环3内圆柱面空间形成沿轴向方向的磁感线。所述环状磁铁固定结构12呈现圆环状，其上圆周均布所述磁铁11，固定在所述活塞4内，套在所述标尺2上。
在实际使用中，所述位置磁环3处于所述标尺2的不同所述隧道磁电阻传感器芯片10位置上，实现不同电路导通，向所述电信号转化装置1传输所述标尺2位置对应的电压或电流信号，获得所述位置磁环3在所述标尺2上的位置，进而获得所述活塞杆6伸出长度。
在电路电压或电流计算时，如附图7所示。外接电压VCC，电路中电阻分别设施为R1、R2、R3、R4。当R1对应的所述隧道磁电阻传感器芯片10在所述位置磁环3作用下导通，则电路中电阻为R＝R1+R2+R3+R4；当R2对应的所述隧道磁电阻传感器芯片10在所述位置磁环3作用下导通，则电路中电阻为R＝R2+R3+R4；当R3对应的所述隧道磁电阻传感器芯片10在所述位置磁环3作用下导通，则电路中电阻为R＝R3+R4；当R4对应的所述隧道磁电阻传感器芯片10在所述位置磁环3作用下导通，则电路中电阻为R＝R4；以此类推，获得所述位置磁环3在不同所述隧道磁电阻传感器芯片10位置处的电压或电流信号，进而实现所述活塞杆6伸出长度的检测。
以上对本发明的较佳实施进行了具体说明，当然，本发明还可以采用与上 述实施方式不同的形式，熟悉本领域的技术人员在不违背本发明精神的前提下所作的等同的变换或相应的改动，都应该属于本发明的保护范围内。

Claims (10)

  1. 液压缸伸长量检测装置，其特征在于，包括：
    电信号转化装置，置于缸筒的底部；
    标尺，一端与所述电信号转化装置固定连接，另一端活动延伸至活塞杆内；
    位置磁环，固定连接在活塞上，且所述位置磁环活动套接在所述标尺的外周侧；当所述位置磁环处于所述标尺的不同位置时，可实现不同电路的导通，向所述电信号转化装置传输所述标尺位置对应的电压或电流信号，获得所述位置磁环在所述标尺上的位置，进而获得活塞杆的伸出长度。
  2. 根据权利要求1所述的液压缸伸长量检测装置，其特征在于，所述标尺由导电管、电磁感应装置组成，所述电磁感应装置置于所述导电管内；所述导电管一端固定在缸筒的底部，并与所述电信号转化装置固定连接，另一端置于活塞杆轴心孔内。
  3. 根据权利要求2所述的液压缸伸长量检测装置，其特征在于，所述导电管置于活塞杆轴心孔内的一端封闭设置。
  4. 根据权利要求1所述的液压缸伸长量检测装置，其特征在于，所述电磁感应装置由印刷电路板及置于所述印刷电路板上的隧道磁电阻传感器芯片组成；所述印刷电路板置于所述导电管内孔中并与所述导电管轴线平行。
  5. 根据权利要求4所述的液压缸伸长量检测装置，其特征在于，所述印刷电路板连接有避免其在所述导电管内发生弯曲的支撑件。
  6. 根据权利要求5所述的液压缸伸长量检测装置，其特征在于，所述支撑件选用弹性支撑环。
  7. 根据权利要求4或5或6所述的液压缸伸长量检测装置，其特征在于，所述 隧道磁阻传感器芯片在所述印刷电路板上单排等间距分布或多排交叉等间距分布或仅在活塞杆工作行程范围等间距分布。
  8. 根据权利要求4或5或6所述的液压缸伸长量检测装置，其特征在于，所述隧道磁电阻传感器芯片由第一铁磁层、非磁绝缘层、第二铁磁层叠加组成；所述隧道磁电阻传感器芯片在位置磁环磁场作用下，若第一铁磁层、第二铁磁层磁化方向平行，则处于低阻抗模式，电路处于导通状态，进而使得所述位置磁环所处标尺位置对应的电路导通，向所述电信号转化装置传输所述标尺位置对应的电压或电流信号。
  9. 根据权利要求1所述的液压缸伸长量检测装置，其特征在于，所述位置磁环由磁铁固定结构及置于所述环状磁铁固定结构上的磁铁组成；所述磁铁固定结构与活塞固定连接并与其同轴，所述磁铁固定结构与所述标尺同轴，在活塞驱动下可沿所述标尺轴向滑动。
  10. 根据权利要求9所述的液压缸伸长量检测装置，其特征在于，所述磁铁固定机构呈圆环状，所述磁铁圆周均布在所述磁铁固定结构上，所述磁铁固定结构固定在活塞内并活动套接在所述标尺的外周侧。
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