阅读说明：本技术 一种基于磁栅尺的直线位移测量系统及其使用方法 (Linear displacement measuring system based on magnetic grid ruler and using method thereof ) 是由 冯江林 于 2020-11-27 设计创作，主要内容包括：本发明公开一种基于磁栅尺的直线位移测量系统及其使用方法,其系统部分包括缩式磁栅尺位移传感机构,用于连接两个相对移动的物体测量其直线位移的位移量；位移数据处理模块,与伸缩式磁栅尺位移传感机构通过BISS协议进行信号的连接传输,用于将伸缩式磁栅尺位移传感机构中的位移测量组件输出的特定波形信号解析为相对位移数值。通过设置由可相对滑动的壳体和伸缩杆组成的伸缩组件对直线位移的两个物件进行连接,通过测量壳体和伸缩杆的位移距离达到测量直线位移的两个物件位移距离的目的,解决了直接利用传感器测量两个物件相对位移距离时可能由于物件的旋转震动或由于传感器受到阻挡干扰而导致的测量精度下降或测量数据间断等问题。(The invention discloses a linear displacement measuring system based on a magnetic grid ruler and a using method thereof, wherein the system part comprises a telescopic magnetic grid ruler displacement sensing mechanism which is used for connecting two objects which move relatively to measure the displacement of the linear displacement; and the displacement data processing module is connected with the telescopic magnetic grid ruler displacement sensing mechanism through a BISS protocol for signal transmission and is used for analyzing a specific waveform signal output by a displacement measuring component in the telescopic magnetic grid ruler displacement sensing mechanism into a relative displacement numerical value. The two objects which are linearly displaced are connected by the telescopic assembly consisting of the shell and the telescopic rod which can slide relatively, the displacement distance between the shell and the telescopic rod is measured to measure the displacement distance between the two objects which are linearly displaced, and the problems that the measurement precision is reduced or the measurement data is interrupted and the like due to the rotation vibration of the objects or the blocking interference of the sensor when the sensor is directly utilized to measure the relative displacement distance between the two objects are solved.)

1. The utility model provides a linear displacement measurement system based on magnetic grid chi which characterized in that: it includes:

the telescopic magnetic grid ruler displacement sensing mechanism is used for connecting two objects which move relatively to measure the displacement of the linear displacement of the two objects; the displacement measuring device comprises a telescopic component formed by mutually sliding and connecting a shell and a telescopic rod, and a displacement measuring component which is arranged in the telescopic component and consists of a magnetic scale and a magnetic reading head and is used for measuring the telescopic displacement of the telescopic component, wherein the displacement measuring component converts the relative position change into a specific waveform signal;

and the displacement data processing module is connected with the telescopic magnetic grid ruler displacement sensing mechanism through a BISS protocol for signal transmission and is used for analyzing a specific waveform signal output by a displacement measuring component in the telescopic magnetic grid ruler displacement sensing mechanism into a relative displacement numerical value.

2. The linear displacement measurement system based on the magnetic scale of claim 1, wherein: the displacement data processing module comprises an MCU (microprogrammed control Unit) board for a program software carrier, a display carrier LED board for the program software carrier and an IO board, wherein the IO board comprises a 5V power supply, a sensor +2 RS485 and 6 paths of sensors, and the power supply of each path of sensor can be independently controlled to be switched on and switched off.

3. The linear displacement measurement system based on the magnetic scale of claim 1, wherein: the BISS protocol is an RS422 signal, and an RS485 chip is selected; the displacement data processing module reserves a BISS protocol special chip IC-MB3 for subsequent upgrading and increasing the data function of the read-write sensor.

4. The linear displacement measurement system based on the magnetic scale of claim 1, wherein: the magnetic scale is arranged in the shell, the magnetic reading head is arranged at one end of the telescopic rod, which is positioned in the inner cavity of the shell, and when the shell and the telescopic rod slide, the magnetic reading head generates displacement oscillogram data relative to the displacement of the magnetic scale; the telescopic rod is provided with a sliding block used for preventing the telescopic rod from rotating, and the sliding block is connected with the shell in a sliding mode and can slide and displace relatively.

5. The linear displacement measurement system based on the magnetic scale of claim 1, wherein: the inner cavity of the telescopic rod is provided with a connecting cable, two ends of the connecting cable respectively penetrate through two ends of the telescopic rod, one end of the connecting cable is connected with the magnetic reading head, the other end of the connecting cable is connected with an aviation plug, and the aviation plug is fixedly arranged on the shaft side of one end of the telescopic rod; the aviation plug is connected with the displacement processing module through an external cable, the magnetic reading head transmits oscillogram data which is displaced relative to the magnetic scale to the displacement processing module through the connecting cable, the aviation plug and the external cable by adopting a BISS protocol, and the displacement processing module analyzes the numerical value of the relative displacement by utilizing the oscillogram data.

6. The linear displacement measurement system based on the magnetic scale of claim 1, wherein: the one end that casing and telescopic link contacted is equipped with dust cover and sealing washer, and the dust cover is fixed to be set up in the tip outside of casing and telescopic link contact one end and parcel tip, and the tip inner edge of casing and telescopic link contact one end is located to the sealing washer.

7. The linear displacement measurement system based on the magnetic scale of claim 1, wherein: the magnetic scale is arranged in the inner cavity of the shell through a magnetic scale fixing seat, sliding grooves correspondingly matched with the sliding blocks are formed in the two side edges of the magnetic scale fixing seat, and the sliding blocks are connected with the shell in a sliding mode through the sliding grooves in the side edges of the magnetic scale fixing seat; the slider is fixedly connected to one end, located in the inner cavity of the shell, of the telescopic rod, and the magnetic reading head is installed on the slider.

8. A method of using a magnetic scale-based linear displacement measurement system according to claim 1, wherein: the method comprises the following specific steps:

s1, fixing the magnetic scale in the inner groove of the magnetic scale fixing seat, and then fastening the magnetic scale fixing seat on the shell by using a screw;

s2, the magnetic reading head is fastened on one end of the telescopic rod, which is positioned in the inner cavity of the shell, or the slide block by screws, and is connected with a cable in the inner cavity of the telescopic rod through a cable plug, the cable extends to the front end of the telescopic rod to be connected with an aviation plug, and the aviation plug is fastened with the shaft side of the front end of the telescopic rod by screws;

s3, fastening the slide block at one end of the telescopic rod positioned in the inner cavity of the shell, inserting the telescopic rod into a linear bearing arranged at the front end of the shell, and positioning the telescopic rod in the inner cavity of the shell in a sliding manner;

s4, the two sides of the sliding block are matched and assembled with the side faces of the inner groove of the magnetic scale fixing seat, so that the telescopic rod and the sliding block cannot rotate in the relative sliding process of the inner groove of the magnetic scale fixing seat, the magnetic scale and the magnetic reading head can move relatively stably and smoothly, and the waveform data read by the magnetic reading head is stable and reliable;

s5, installing a dust cover and a sealing ring at one end of the shell, which is in contact with the telescopic rod, so that impurities such as dust can not enter, and the smooth telescopic process can be ensured without interfering with the measurement precision;

s6, fixedly installing an aviation plug at the shaft side of one end of the telescopic rod, connecting the magnetic reading head with the aviation plug by using a connecting cable, and connecting the aviation plug with the displacement processing module by using an external cable;

s7, when the telescopic magnetic grid ruler displacement sensing mechanism is driven, the shell and the telescopic rod slide to drive the magnetic ruler and the magnetic reading head to slide to each other, the real-time position generated in the position moving process changes numerical value signals relative to the absolute value of the set origin, the signals are converted into specific waveform signals by the magnetic reading head and are transmitted to the displacement processing module through a BISS protocol;

and S8, converting the specific waveform signal into an EtherCAT bus signal by program software preset on the MCU board in the displacement processing module, and transmitting the EtherCAT bus signal to external industrial control equipment for reading processing.

Technical Field

The invention is applied to the field of displacement measurement, and particularly relates to a linear displacement measurement system based on a magnetic grid ruler and a using method thereof.

Background

The linear displacement measurement operation is commonly applied in various scenes, and most of the existing linear distance measurement methods are to install one or a pair of sensors on the surfaces of two objects which are displaced relatively to each other to sense the displacement between the two objects, but the operation method of arranging the sensors on the surfaces of the objects has the following defects: 1. when the object moving relatively vibrates or rotates, the accuracy of the sensor on the surface of the object is greatly affected. 2. When other barriers appear between the objects with relative displacement and block signals of the ranging sensor, the displacement measurement is interrupted, so that the overall ranging effect is influenced. 3. The signals generated by the sensor when the object is relatively displaced are difficult to be accurately received and converted and then are transmitted to external industrial control equipment for reading and processing.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a linear displacement measuring system based on a magnetic grid ruler and a using method thereof.

In order to solve the above technical problem, the present invention provides a linear displacement measuring system based on a magnetic scale, comprising:

the telescopic magnetic grid ruler displacement sensing mechanism is used for connecting two objects which move relatively to measure the displacement of the linear displacement of the two objects; the displacement measuring device comprises a telescopic component formed by mutually sliding and connecting a shell and a telescopic rod, and a displacement measuring component which is arranged in the telescopic component and consists of a magnetic scale and a magnetic reading head and is used for measuring the telescopic displacement of the telescopic component, wherein the displacement measuring component converts the relative position change into a specific waveform signal;

and the displacement data processing module is connected with the telescopic magnetic grid ruler displacement sensing mechanism through a BISS protocol for signal transmission and is used for analyzing a specific waveform signal output by a displacement measuring component in the telescopic magnetic grid ruler displacement sensing mechanism into a relative displacement numerical value.

As a possible implementation manner, further, the displacement data processing module includes an MCU board for a program software carrier, a display carrier LED board for the program software carrier, and an IO board, where the IO board includes a 5V power supply, a sensor +2 × RS485, and 6 sensors, and the power supply of each sensor can be controlled to be turned on or off independently.

As a possible implementation manner, further, the BISS protocol is an RS422 signal, and an RS485 chip is selected; the displacement data processing module reserves a BISS protocol special chip IC-MB3 for subsequent upgrading and increasing the data function of the read-write sensor.

As a possible implementation manner, further, the magnetic scale is arranged in the shell, the magnetic reading head is arranged at one end of the telescopic rod, which is positioned in the inner cavity of the shell, and when the shell and the telescopic rod slide, the magnetic reading head generates displacement oscillogram data relative to the displacement of the magnetic scale; the telescopic rod is provided with a sliding block used for preventing the telescopic rod from rotating, and the sliding block is connected with the shell in a sliding mode and can slide and displace relatively.

As a possible implementation manner, further, a connection cable is arranged in the inner cavity of the telescopic rod, two ends of the connection cable respectively penetrate through two ends of the telescopic rod, one end of the connection cable is connected with the magnetic reading head, the other end of the connection cable is connected with the aviation plug, and the aviation plug is fixedly installed on the shaft side of one end of the telescopic rod; the aviation plug is connected with the displacement processing module through an external cable, the magnetic reading head transmits oscillogram data which is displaced relative to the magnetic scale to the displacement processing module through the connecting cable, the aviation plug and the external cable by adopting a BISS protocol, and the displacement processing module analyzes the numerical value of the relative displacement by utilizing the oscillogram data.

As a possible implementation manner, further, a dust cover and a sealing ring are arranged at one end of the shell, which is in contact with the telescopic rod, the dust cover is fixedly arranged at the outer side of the end portion of the shell, which is in contact with the telescopic rod, and wraps the end portion, and the sealing ring is arranged at the inner edge of the end portion of the shell, which is in contact with the telescopic rod.

As a possible implementation manner, further, the magnetic scale is installed in the inner cavity of the shell through a magnetic scale fixing seat, sliding grooves correspondingly matched with the sliding blocks are formed in two side edges of the magnetic scale fixing seat, and the sliding blocks are connected with the shell in a sliding mode through the sliding grooves in the side edges of the magnetic scale fixing seat; the slider is fixedly connected to one end, located in the inner cavity of the shell, of the telescopic rod, and the magnetic reading head is installed on the slider.

A use method of a linear displacement measurement system based on a magnetic grid ruler comprises the following specific steps:

s1, fixing the magnetic scale in the inner groove of the magnetic scale fixing seat, and then fastening the magnetic scale fixing seat on the shell by using a screw;

s2, the magnetic reading head is fastened on one end of the telescopic rod, which is positioned in the inner cavity of the shell, or the slide block by screws, and is connected with a cable in the inner cavity of the telescopic rod through a cable plug, the cable extends to the front end of the telescopic rod to be connected with an aviation plug, and the aviation plug is fastened with the shaft side of the front end of the telescopic rod by screws;

s3, fastening the slide block at one end of the telescopic rod positioned in the inner cavity of the shell, inserting the telescopic rod into a linear bearing arranged at the front end of the shell, and positioning the telescopic rod in the inner cavity of the shell in a sliding manner;

s4, the two sides of the sliding block are matched and assembled with the side faces of the inner groove of the magnetic scale fixing seat, so that the telescopic rod and the sliding block cannot rotate in the relative sliding process of the inner groove of the magnetic scale fixing seat, the magnetic scale and the magnetic reading head can move relatively stably and smoothly, and the waveform data read by the magnetic reading head is stable and reliable;

s5, installing a dust cover and a sealing ring at one end of the shell, which is in contact with the telescopic rod, so that impurities such as dust can not enter, and the smooth telescopic process can be ensured without interfering with the measurement precision;

s6, fixedly installing an aviation plug at the shaft side of one end of the telescopic rod, connecting the magnetic reading head with the aviation plug by using a connecting cable, and connecting the aviation plug with the displacement processing module by using an external cable;

s7, when the telescopic magnetic grid ruler displacement sensing mechanism is driven, the shell and the telescopic rod slide to drive the magnetic ruler and the magnetic reading head to slide to each other, the real-time position generated in the position moving process changes numerical value signals relative to the absolute value of the set origin, the signals are converted into specific waveform signals by the magnetic reading head and are transmitted to the displacement processing module through a BISS protocol;

and S8, converting the specific waveform signal into an EtherCAT bus signal by program software preset on the MCU board in the displacement processing module, and transmitting the EtherCAT bus signal to external industrial control equipment for reading processing.

By adopting the technical scheme, the invention has the following beneficial effects:

1. according to the invention, the two linearly displaced objects are connected by the telescopic assembly consisting of the shell and the telescopic rod which can slide relatively, the displacement distance of the two linearly displaced objects is measured by measuring the displacement distance of the shell and the telescopic rod, and the problems of measurement precision reduction or measurement data discontinuity and the like caused by rotation vibration of the objects or blocking interference of the sensor when the sensor is directly used for measuring the relative displacement distance of the two objects are solved.

2. According to the invention, the displacement measuring assembly consisting of the magnetic reading head and the magnetic scale which move relatively is arranged in the telescopic assembly, so that the device can measure the displacement of the telescopic assembly in real time, the measuring accuracy is improved through the magnetic reading head and the magnetic scale which are matched, and the slide block for preventing the telescopic rod from rotating prevents the telescopic rod and the magnetic reading head from rotating to influence the measuring accuracy in the telescopic process. The relative position change is generated between the magnetic reading head and the magnetic scale, the relation of the relative position change is read by the magnetic reading head and forms a specific waveform signal, the specific waveform signal is transmitted to the displacement processing module through a cable connected with the magnetic reading head, and the displacement processing module analyzes the numerical value of the relative displacement by utilizing the oscillogram data so as to achieve the aim of accurate measurement.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of part B of the present invention;

FIG. 3 is a schematic perspective view of the present invention;

FIG. 4 is a waveform diagram of the BISS protocol of the present invention;

fig. 5 is a timing diagram of the BISS protocol of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.

As shown in fig. 1 to 5, the present invention provides a linear displacement measuring system based on a magnetic scale, which includes:

the telescopic magnetic grid ruler displacement sensing mechanism 100 is used for connecting two objects which move relatively to measure the displacement of linear displacement of the two objects; the device comprises a telescopic component 1 formed by mutually sliding and connecting a shell 11 and a telescopic rod 12, and a displacement measurement component 2 which is arranged in the telescopic component and consists of a magnetic scale 21 and a magnetic reading head 22 and is used for measuring the telescopic displacement of the telescopic component, wherein the displacement measurement component 2 converts the relative position change into a specific waveform signal;

and the displacement data processing module 26 is connected and transmitted with the telescopic magnetic grid ruler displacement sensing mechanism 100 through a BISS protocol, and is used for analyzing a specific waveform signal output by the displacement measuring component 2 in the telescopic magnetic grid ruler displacement sensing mechanism 100 into a relative displacement numerical value.

As a possible implementation manner, further, the displacement data processing module 26 includes an MCU board for a program software carrier, an LED board for a display carrier, and an IO board, where the IO board includes a 5V power supply, a sensor +2 × RS485, and 6 sensors, and the power supply of each sensor can be controlled to be turned on or off individually.

As a possible implementation manner, further, the BISS protocol is an RS422 signal, and an RS485 chip enable pin is selected for channel selection when the 6-way sensor shares the SPI. The displacement data processing module 26 reserves a BISS protocol special chip IC-MB3 for subsequent upgrading to add a read-write sensor data function.

As a possible embodiment, further, the magnetic scale 21 is disposed in the housing 11, the magnetic reading head 22 is disposed at one end of the telescopic rod 12 located in the inner cavity of the housing 11, and when the housing 11 and the telescopic rod 12 slide, the magnetic reading head 22 displaces relative to the magnetic scale 21 to generate displacement oscillogram data; the telescopic rod 12 is provided with a sliding block 13 for preventing the telescopic rod from rotating, and the sliding block 13 is connected with the shell in a sliding manner and can slide and displace relatively.

As a possible implementation manner, further, a connection cable is arranged in the inner cavity of the telescopic rod 12, two ends of the connection cable respectively penetrate through two ends of the telescopic rod, one end of the connection cable is connected with the magnetic reading head 22, the other end of the connection cable is connected with the aviation plug 24, and the aviation plug 24 is fixedly installed on the shaft side of one end of the telescopic rod 12; the aviation plug 24 is connected with the displacement processing module through an external cable 25, the magnetic reading head 22 transmits the oscillogram data which is displaced relative to the magnetic scale 21 and generates displacement to the displacement processing module through the connecting cable, the aviation plug and the external cable by adopting a BISS protocol, and the displacement processing module analyzes the numerical value of the relative displacement by utilizing the oscillogram data. Range of magnetic scale (192 mm) × bit number of magnetic scale (20 th power of 2) = pulse pitch (λ) of magnetic scale.

As a possible embodiment, further, a dust cover 16 and a sealing ring 17 are arranged at one end of the shell 11 contacting with the telescopic rod 12, the dust cover 16 is fixedly arranged at the outer side of the end of the shell 11 contacting with the telescopic rod 12 and wraps the end, and the sealing ring 17 is arranged at the inner edge of the end of the shell 11 contacting with the telescopic rod 12.

As a possible implementation manner, further, the magnetic scale 21 is installed in the inner cavity of the housing through a magnetic scale fixing seat 27, sliding grooves correspondingly matched with the sliding block 13 are formed in two side edges of the magnetic scale fixing seat 27, and the sliding block 13 is slidably connected with the housing through the sliding grooves in the side edges of the magnetic scale fixing seat 27; the sliding block 13 is fixedly connected to one end of the telescopic rod, which is positioned in the inner cavity of the shell 11, and the magnetic reading head is installed on the sliding block 13.

A use method of a linear displacement measurement system based on a magnetic grid ruler comprises the following specific steps:

s1, fixing the magnetic scale in the inner groove of the magnetic scale fixing seat, and then fastening the magnetic scale fixing seat on the shell by using a screw;

s2, the magnetic reading head is fastened on one end of the telescopic rod, which is positioned in the inner cavity of the shell, or the slide block 13 by using screws, and is connected with a cable in the inner cavity of the telescopic rod through a cable plug, the cable extends to the front end of the telescopic rod and is connected with an aviation plug, and the aviation plug is fastened with the shaft side of the front end of the telescopic rod by using screws;

s3, fastening the slide block 13 at one end of the telescopic rod positioned in the inner cavity of the shell, inserting the telescopic rod into a linear bearing arranged at the front end of the shell to be positioned in the inner cavity of the shell in a sliding way;

s4, the two sides of the sliding block are matched and assembled with the side faces of the inner groove of the magnetic scale fixing seat, so that the telescopic rod and the sliding block cannot rotate in the relative sliding process of the inner groove of the magnetic scale fixing seat, the magnetic scale and the magnetic reading head can move relatively stably and smoothly, and the waveform data read by the magnetic reading head is stable and reliable;

s5, installing a dust cover and a sealing ring at one end of the shell, which is in contact with the telescopic rod, so that impurities such as dust can not enter, and the smooth telescopic process can be ensured without interfering with the measurement precision;

s6, fixedly installing an aviation plug at the shaft side of one end of the telescopic rod, connecting the magnetic reading head with the aviation plug by using a connecting cable, and connecting the aviation plug with the displacement processing module by using an external cable;

s7, when the telescopic magnetic grid ruler displacement sensing mechanism is driven, the shell and the telescopic rod slide to drive the magnetic ruler and the magnetic reading head to slide to each other, the real-time position generated in the position moving process changes numerical value signals relative to the absolute value of the set origin, the signals are converted into specific waveform signals by the magnetic reading head and are transmitted to the displacement processing module through a BISS protocol;

and S8, converting the specific waveform signal into an EtherCAT bus signal by program software preset on the MCU board in the displacement processing module, and transmitting the EtherCAT bus signal to external industrial control equipment for reading processing.

The telescopic rod telescopic mechanism is arranged on an equipment operation part (a hydraulic driving execution element (oil cylinder)) and keeps the telescopic direction of the telescopic rod on the equipment operation part consistent with the operation direction of the equipment operation part; the telescopic magnetic grid ruler displacement sensing mechanism 100 comprises a telescopic component 1 and a displacement measuring component 2 arranged in the telescopic component 1; the telescopic assembly 1 comprises a shell 11 and a telescopic rod 12 which are mutually connected in a sliding way; the telescopic rod 12 is provided with a sliding block 13 for preventing the telescopic rod 12 from rotating, and the sliding block 13 is connected with the shell 11 in a sliding manner and can move in a relative sliding manner. The outer ends of the shell 11 and the telescopic rod 12 are respectively provided with a first connector 14 and a second connector 15. The dust cover 16 and the sealing ring 17 are arranged at one end, in contact with the telescopic rod 12, of the shell 11, the dust cover 16 is fixedly arranged on the outer side of the end, in contact with the telescopic rod 12, of the shell 11 and wraps the end, and the sealing ring 17 is arranged on the inner edge of the end, in contact with the telescopic rod 12, of the shell 11. The inner cavity of one end of the shell 11, which is in contact with the telescopic rod 12, is provided with a linear bearing 18, the outer wall of the linear bearing 18 is fixedly connected with the inner wall of the end part of the shell 11, and the telescopic rod 12 is inserted into the inner cavity of the linear bearing 18 and is in sliding connection with the inner wall. The displacement measuring component 2 comprises a magnetic ruler 21 which is arranged in the shell 11 and is arranged correspondingly with each other, and a magnetic reading head 22 which is arranged at one end of the telescopic rod 12 positioned in the inner cavity of the shell 11; when the shell 11 and the telescopic rod 12 slide, the magnetic reading head 22 displaces relative to the magnetic scale 21 to generate displacement oscillogram data. The two objects which are linearly displaced are connected by the telescopic assembly 1 consisting of the shell 11 and the telescopic rod 12 which can slide relatively, the displacement distance of the two objects which are linearly displaced is measured by measuring the displacement distance of the shell 11 and the telescopic rod 12, and the problems that the measurement precision is reduced or the measurement data is discontinuous and the like due to the rotation vibration of the objects or the blocking interference of the sensors when the sensors are directly utilized to measure the relative displacement distance of the two objects are solved. The magnetic scale 21 is installed in the inner cavity of the shell 11 through a magnetic scale fixing seat 27, sliding grooves corresponding to and matched with the sliding blocks 13 are formed in two side edges of the magnetic scale fixing seat 27, and the sliding blocks 13 are connected with the shell 11 in a sliding mode through the sliding grooves in the side edges of the magnetic scale fixing seat 27. The sliding block 13 is fixedly connected to one end of the telescopic rod 12, which is located in the inner cavity of the shell 11, and the magnetic reading head 22 is installed on the sliding block 13. The inner cavity of the telescopic rod 12 is provided with a connecting cable 23, two ends of the connecting cable 23 penetrate through two ends of the telescopic rod 12 respectively, one end of the connecting cable 23 is connected with the magnetic reading head 22, the other end of the connecting cable is connected with the aviation plug 24, and the aviation plug 24 is fixedly installed on one end shaft side of the telescopic rod 12. The aviation plug 24 is connected with the displacement processing module 26 through an external cable 25, the magnetic reading head 22 transmits the oscillogram data which is displaced relative to the magnetic scale 21 and generates displacement to the displacement processing module 26 through a connecting cable 23, the aviation plug 24 and the external cable 25, and the displacement processing module 26 analyzes the numerical value of the relative displacement by using the oscillogram data and transmits the numerical value to the motion device control system for post-processing through an industrial bus (such as an EtherCAT bus, a CANopen bus and other industrial communication protocol buses); the specific model of the displacement processing module 26 described above may be selected to be DS 192-6. Through the inside displacement measurement subassembly 2 that constitutes by relative movement's magnetic reading head 22 and magnetic scale 21 that sets up at flexible subassembly 1 for the device can carry out real-time measurement to the displacement of flexible subassembly 1, and promote the measuring precision through matched with magnetic reading head 22 and magnetic scale 21, prevent that telescopic link 12 and magnetic reading head 22 from taking place rotation influence measurement accuracy at flexible in-process through setting up the slider 13 that is used for preventing telescopic link 12 rotation. The relative position change is generated between the magnetic reading head 22 and the magnetic scale 21, the relation of the relative position change is read by the magnetic reading head 22 to form a specific waveform signal, the specific waveform signal is transmitted to the displacement processing module 26 through a cable connected with the magnetic reading head 22, and the displacement processing module 26 analyzes the numerical value of the relative displacement by utilizing the waveform data to achieve the purpose of accurate measurement. When the displacement processing module 26 works, the first connector 14 and the second connector 15 are respectively connected with two relatively displaced objects, wherein the first connector 14 is connected with an immovable object in the two relatively displaced objects, the second connector 15 is connected with an equipment component which needs to feed back the change of the linear motion position in real time, when the two objects are relatively linearly displaced, the telescopic rod 12 is pulled to move relative to the shell 11, the telescopic rod 12 slides in the linear bearing 18 in the process, the sliding block 13 slides on the sliding groove at the side edge of the magnetic scale fixing seat 27 to stabilize the whole sliding process, at the moment, the magnetic reading head 22 in the inner cavity of the shell 11 transmits the oscillogram data which is displaced relative to the magnetic scale 21 to the displacement processing module 26 through the connecting cable 23, the aviation plug 24 and the external cable 25, and the displacement processing module 26 analyzes the numerical value of the relative displacement by utilizing the oscillogram data and then transmits the numerical value through an industrial, CANopen bus, etc.) to the motion device control system for post-processing, so as to achieve the purpose of measuring the relative displacement of two moving objects.

The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.