A non-similar redundant intelligent displacement sensor

Abstract

The present invention discloses a non-similar redundant intelligent displacement sensor, which relates to the technical field of displacement sensors, including a housing, an LVDT sensor element and a quasi-magnetic grating sensor element, wherein the LVDT sensor element is fixedly installed inside the housing, and a quasi-magnetic grating sensor element is installed between the LVDT sensor element and the housing, and the LVDT sensor element and the quasi-magnetic grating sensor element are mutually nested and slidably connected. The present invention designs two redundant displacement sensors with different working principles, thereby avoiding the potential accidents caused by the use of a single displacement sensor in the prior art, and at the same time solves the problem that the redundant displacement sensors with the same working principle in the prior art cannot tolerate different failure mechanisms, and has high reliability during operation; the LVDT sensor and the quasi-magnetic grating sensor are efficiently integrated together, and have the advantages of compact structure and small size.

Description

Technical Field

[0001] The present invention relates to the technical field of displacement sensors, and in particular to a non-similar redundant intelligent displacement sensor. Background Art

[0002] In order to detect the status of each part of the actuator in real time when it is working, it is necessary to install sensors on the actuator to collect the working data of the actuator. The displacement sensor is a sensor that is widely used on the actuator. It can convert the displacement into electrical quantity and then calculate the displacement value. Improving the reliability of the displacement sensor reading data is of great significance to the safe operation of the actuator. At present, a single displacement sensor is mostly used on the actuator to measure the working data of the actuator. When a single displacement sensor fails to work normally due to an emergency, it is easy to cause serious consequences. The existing market also uses redundant technology to measure data simultaneously by using multiple sensors to improve data reliability and reduce the impact of sensor failure. However, most of the existing redundant technologies use multiple displacement sensors with the same working principle to measure data, which cannot tolerate different failure mechanisms and still have defects. Summary of the invention

[0003] The purpose of the present invention is to provide a non-similar redundant intelligent displacement sensor in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0005] The present invention provides a non-similar redundant intelligent displacement sensor, comprising a shell, an LVDT sensor element and a quasi-magnetic grating sensor element, wherein a first opening is provided at one end of the shell, an LVDT sensor element is fixedly installed inside the shell, a quasi-magnetic grating sensor element is installed between the LVDT sensor element and the shell, the LVDT sensor element and the quasi-magnetic grating sensor element are nested and slidably connected with each other, and the quasi-magnetic grating sensor element slides back and forth along the length direction of the LVDT sensor element.

[0006] Preferably, the LVDT sensor element comprises an LVDT sensor body, an end cover, a lead wire, a support frame, a primary coil, a secondary coil, a pull rod and an iron core, a second opening is provided at one end of the LVDT sensor body, a support frame is fixedly installed inside the LVDT sensor body, a channel is provided in the support frame, and the channel is distributed along the length direction of the support frame, a first groove is provided at the center of the support frame, a primary coil is installed in the first groove, the support frame is provided with second grooves at both ends of the primary coil, a secondary coil is installed in the second groove, a lead wire is installed at one end of the LVDT sensor body away from the second opening, an end cover is installed at one end of the LVDT sensor body close to the second opening, a through groove connected to the channel is processed on the end cover, an iron core is installed at one end of the pull rod, a connecting portion is provided at the other end of the pull rod, the end of the pull rod with the iron core is located in the channel, and the end of the pull rod with the connecting portion extends through the through groove to the outside of the LVDT sensor body, and the diameter of the pull rod is smaller than the diameter of the channel.

[0007] Furthermore, the support frame is provided with third grooves near both ends, and magnetic isolation gaskets are installed in the third grooves.

[0008] Preferably, the quasi-magnetic grating sensor element comprises a quasi-magnetic grating sensor body, a quasi-magnetic grating scale and a quasi-magnetic grating probe, a third opening being provided at one end of the quasi-magnetic grating sensor body, a quasi-magnetic grating scale being fixedly installed inside the quasi-magnetic grating sensor body, the quasi-magnetic grating scale being sleeved on the LVDT sensor body, the inner side surface of the quasi-magnetic grating scale being fitted with the outer side surface of the LVDT sensor body, the quasi-magnetic grating probe being fixedly installed on the end surface of the end cover away from the LVDT sensor body, a connecting line being provided on the quasi-magnetic grating probe, and the quasi-magnetic grating probe corresponding to the quasi-magnetic grating scale.

[0009] Furthermore, one end of the pull rod with the connecting portion crosses the end of the magnetic grating sensor body away from the third opening and extends to the outside of the magnetic grating sensor body, and the pull rod is fixedly connected to the magnetic grating sensor body by a fastener.

[0010] Furthermore, the magnetic grid scale includes a cylinder and a semi-cylinder, the cylinder and the semi-cylinder are integrally formed, the semi-cylinder is made of magnetic conductive material, and hollow grooves are processed on the semi-cylinder, and the hollow grooves are evenly spaced in the length direction of the semi-cylinder.

[0011] Furthermore, the inner diameter of the semi-cylinder is larger than the inner diameter of the cylinder.

[0012] Preferably, a guide component is provided on the inner side of the shell, the outer side surface of the guide component is in contact with the inner side surface of the shell, and the inner side surface of the guide component is adjacent to the outer side surface of the magnetic grating sensor body.

[0013] Furthermore, the guide assembly includes a sleeve and a guide ring, there are multiple sleeves, and the guide rings are installed between the sleeves. The inner side surface of the guide ring fits with the outer side surface of the magnetic grating sensor body.

[0014] Furthermore, a sealing ring is provided at one end of the shell close to the first opening, and a fixing piece is provided on the outer side of the shell.

[0015] The working principle of the present invention is as follows: (1) the connecting part of the pull rod is connected to the object to be measured through a universal joint, and the lead wires on the LVDT sensor element and the connecting wires on the quasi-magnetic grid sensor element are respectively connected to an external computer; (2) when the object to be measured produces a linear displacement, the pull rod is driven to move, and the pull rod drives the iron core to move back and forth in the channel of the support frame. Since the primary coil and the secondary coil are installed on the support frame, the magnetic field in the space changes to a certain extent when the iron core moves back and forth. As the magnetic field in the space changes, the mutual inductance between the primary coil and the secondary coil will also change accordingly, and the secondary coil will generate an induced electromotive force. As the position of the iron core changes, the primary coil and the secondary coil will change. The mutual inductance between the coils is also different, and the induced electromotive force generated by the secondary coil is also different. In this way, the displacement of the iron core is converted into a voltage signal and output through the lead wire to realize the displacement measurement of the measured object; (3) At the same time, since the pull rod on the LVDT sensor element is fixedly connected to the quasi-magnetic grating sensor body, the quasi-magnetic grating scale also moves synchronously. The quasi-magnetic grating probe fixedly installed on the end cover is composed of a permanent magnet and a sensitive element. The permanent magnet is used to generate an excitation magnetic field, and the sensitive element detects changes in the magnetic field. The quasi-magnetic grating scale uses a magnetic conductive material. When the pull rod on the LVDT sensor element moves, the quasi-magnetic grating scale moves synchronously. Since the quasi-magnetic grating scale can modulate the magnetic lines of force of the permanent magnet, , achieving the effect of detecting displacement; (4) transmitting the two sets of data measured by the LVDT sensor element and the quasi-magnetic grating sensor element to the dedicated monitoring program of the external computer, judging the two sets of data, and sending a sensor error alarm message when the judgment data is wrong, and outputting the final data when the judgment data is correct; the specific working process is that the LVDT sensor element and the quasi-magnetic grating sensor element respectively input the data measured within 1 second into the external computer and run the monitoring program, and after multiple steps of inspection to improve the reliability of the obtained data and judge which sensor has a fault, first judge whether the data obtained by the LVDT sensor element exceeds the range, and if it is full After the conditions are met, calculate whether the root mean square of this set of data is greater than the maximum root mean square to check whether there is a sudden change. When the conditions are not met, the monitoring program will ask whether there is a large displacement. After confirmation, it will proceed to the next step, and then compare whether the actual fluctuation frequency is greater than the maximum fluctuation frequency to check whether the LVDT sensor element has abnormal fluctuations due to a fault. If any of the above three points is not met, it will switch to the input data of the magnetic grating sensor element and detect the data in the same steps. If all the above three points are met, it can be determined that the LVDT sensor element is normal. Then calculate whether the static deviation of the two sensor data is greater than the maximum static deviation, so as to determine whether the magnetic grating sensor element is normal.

[0016] The present invention can optimize the structural shape for different applications through the structural advantage of the highly integrated quasi-magnetic grating sensor element to ensure the measurement accuracy of the displacement sensor; the moving surface of the tested piece can be customized according to the optimization result, so that it can be used as a part of the quasi-magnetic grating scale, and the volume of the sensor can be reduced exponentially; the measurement distance of the present invention is theoretically unlimited. The present invention uses a motion behavior feature determination strategy, and the entire sensor includes a dedicated monitoring program. After the sensor transmits data to an external computer, the program determines the data of the LVDT sensor and the quasi-magnetic grating sensor according to the maximum stroke, maximum speed value, highest fluctuation frequency and other feature quantities during the operation process. When the sensor outputs data errors, a sensor error alarm message is sent, so that the sensor has the characteristics of intelligent diagnosis, laying the foundation for the intelligence and reliability of the sensor.

[0017] The invention can be used in the fields of hydraulic devices, wear measurement, automobile industry, etc. and has a wide range of uses.

[0018] The beneficial effects of the present invention are as follows: (1) The present invention designs two redundant displacement sensors with different working principles, thereby avoiding the potential accident hazards of using a single displacement sensor in the prior art, and at the same time solving the problem that the redundant displacement sensors using the same working principle in the prior art cannot tolerate different failure mechanisms, and has high reliability during operation; (2) The redundant displacement sensor has the advantages of high sensitivity and high precision, and can accurately measure the displacement of moving parts to ensure data accuracy to the greatest extent; (3) The LVDT sensor and the quasi-magnetic grating sensor are efficiently integrated together, with the advantages of compact structure and small size; (4) The measurement process of the redundant displacement sensor is all non-contact measurement, which is easy to operate, and the spacing between the quasi-magnetic grating probe and the quasi-magnetic grating scale is large, which is convenient for the installation of the quasi-magnetic grating probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a first stereoscopic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a second stereoscopic diagram of the overall structure of the present invention;

[0021] Figure 3 For the present invention Figure 2 Middle AA section;

[0022] Figure 4 A three-dimensional diagram of an LVDT sensor element of the present invention;

[0023] Figure 5 For the present invention Figure 4 Middle BB section;

[0024] Figure 6 A three-dimensional diagram of the internal structure of the LVDT sensor element of the present invention;

[0025] Figure 7 A three-dimensional diagram of the support frame of the present invention;

[0026] Figure 8 A three-dimensional diagram of a guide assembly of the present invention;

[0027] Fig. 9 It is a structural diagram of the assembly of the LVDT sensor element and the magnetic grating-like sensor element of the present invention;

[0028] Fig.10 A three-dimensional diagram of a magnetic grating sensor element of the present invention;

[0029] Fig.11 For the present invention Fig.10 Middle CC section;

[0030] Fig.12 A three-dimensional diagram of a magnetic grating scale of the present invention;

[0031] Fig.13 It is a schematic diagram of the working principle of the special monitoring program of the present invention.

[0032] Description of reference numerals:

[0033] 1. LVDT sensor element; 11. LVDT sensor body; 12. end cover; 13. lead wire; 14. channel; 15. support frame; 151. first groove; 152. second groove; 153. third groove; 16. primary coil; 17. secondary coil; 18. magnetic isolation gasket; 19. pull rod; 191. iron core;

[0034] 2. Magnetic grating sensor element; 21. Magnetic grating sensor body; 22. Magnetic grating scale; 221. Cylinder; 222. Semi-cylinder; 223. Hollow groove; 23. Magnetic grating probe;

[0035] 3. Shell;

[0036] 4. Fixing parts;

[0037] 5. guide assembly; 51. sleeve; 52. guide ring;

[0038] 6. Sealing ring;

[0039] 7. Fasteners. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings:

[0041] like Figure 1 and Figure 2As shown, the present invention provides a non-similar redundant intelligent displacement sensor, including a housing 3, an LVDT sensor element 1 and a quasi-magnetic grating sensor element 2. A first opening is provided at one end of the housing 3, and the LVDT sensor element 1 is fixedly installed inside the housing 3. A quasi-magnetic grating sensor element 2 is installed between the LVDT sensor element 1 and the housing 3. The LVDT sensor element 1 and the quasi-magnetic grating sensor element 2 are nested and slidably connected with each other, and the quasi-magnetic grating sensor element 2 slides back and forth along the length direction of the LVDT sensor element 1. In this embodiment, the housing 3 is made of a metal material with a diameter of 32 mm.

[0042] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, on the basis of the above embodiment, further, the LVDT sensor element 1 includes an LVDT sensor body 11, an end cover 12, a lead wire 13, a support frame 15, a primary coil 16, a secondary coil 17, a pull rod 19 and an iron core 191. A second opening is provided at one end of the LVDT sensor body 11, and a support frame 15 is fixedly installed inside the LVDT sensor body 11. A channel 14 is provided in the support frame 15, and the channel 14 is distributed along the length direction of the support frame 15. A first groove 151 is provided at the center of the support frame 15, and a primary coil 16 is installed in the first groove 151. The support frame 15 is provided with a second groove 152 at both ends of the primary coil 16, and a secondary coil 17 is installed in the second groove 152. The two secondary coils 17 are wound in reverse series. The lead wire 13 is installed at the end of the LVDT sensor body 11 away from the second opening. The end cover 12 is installed at the end of the LVDT sensor body 11 close to the second opening. The end cover 12 is fixedly mounted on the LVDT sensor body 11 by bolts, and the end cover 12 plays a role in installing and positioning the support frame 15 inside the LVDT sensor body 11. A through groove connected to the channel 14 is processed on the end cover 12. An iron core 191 is installed at one end of the pull rod 19, and a connecting portion is provided at the other end of the pull rod 19. The end of the pull rod 19 with the iron core 191 is located in the channel 14, and the end of the pull rod 19 with the connecting portion extends through the through groove to the outside of the LVDT sensor body 11. The diameter of the pull rod 19 is smaller than the diameter of the channel 14. In order to prevent the displacement sensor from producing large deformation due to resonance during high-frequency movement, a modal analysis of the structure was performed during the design, and the diameter of the pull rod 19 was set to 7.5 mm to achieve the best use effect, so as to increase the resonant frequency of the structure.

[0043] like Figure 3 , Figure 6 and Figure 7As shown, based on the above embodiment, the support frame 15 is further provided with a third groove 153 near both ends, and a magnetic isolation gasket 18 is installed in the third groove 153. The magnetic isolation gasket 18 can effectively reduce the influence of the permanent magnet in the magnetic grating probe 23 on the measurement result of the LVDT sensor element 1.

[0044] like Figure 3 , Fig.10 and Fig.11 As shown, on the basis of the above embodiment, further, the quasi-magnetic grating sensor element 2 includes a quasi-magnetic grating sensor body 21, a quasi-magnetic grating scale 22 and a quasi-magnetic grating probe 23. A third opening is provided at one end of the quasi-magnetic grating sensor body 21. A quasi-magnetic grating scale 22 is fixedly installed inside the quasi-magnetic grating sensor body 21, and the quasi-magnetic grating scale 22 is sleeved on the LVDT sensor body 11, and the inner side surface of the quasi-magnetic grating scale 22 is in contact with the outer side surface of the LVDT sensor body 11. The quasi-magnetic grating probe 23 is fixedly installed on the end surface of the end cover 12 away from the LVDT sensor body 11, and a connecting line is provided on the quasi-magnetic grating probe 23, and the quasi-magnetic grating probe 23 corresponds to the quasi-magnetic grating scale 22.

[0045] like Figure 3 and Fig. 9 As shown, on the basis of the above embodiment, further, one end of the pull rod 19 with the connection portion crosses the end of the quasi-magnetic grating sensor body 21 away from the third opening and extends to the outside of the quasi-magnetic grating sensor body 21. In this embodiment, the pull rod 19 and the quasi-magnetic grating sensor body 21 are fixedly connected by fasteners 7. The pull rod 19 and the quasi-magnetic grating sensor body 21 can also be fixedly connected by welding.

[0046] like Fig.12 As shown, on the basis of the above embodiment, further, the quasi-magnetic scale 22 includes a cylinder 221 and a semi-cylinder 222, the cylinder 221 and the semi-cylinder 222 are integrally formed, and the semi-cylinder 222 is made of a magnetic conductive material. Hollow grooves 223 are processed on the semi-cylinder 222, and the hollow grooves 223 are evenly spaced in the length direction of the semi-cylinder 222. The spacing between the hollow grooves 223 is 0.1 to 0.3 mm. In this embodiment, the spacing of the hollow grooves 223 is 0.2 mm to achieve the best measurement result.

[0047] like Fig.12 As shown, based on the above embodiment, further, the inner diameter of the semi-cylinder 222 is larger than the inner diameter of the cylinder 221. This prevents the cylinder 221 from damaging the inner surface of the semi-cylinder 222 when it moves on the outer surface of the LVDT sensor body 11. In this embodiment, the inner diameter of the semi-cylinder 222 is 0.2 mm larger than the inner diameter of the cylinder 221.

[0048] like Figure 2 and Figure 8As shown, based on the above embodiment, further, a guide assembly 5 is provided on the inner side of the shell 3, the outer side surface of the guide assembly 5 is in contact with the inner side surface of the shell 3, and the inner side surface of the guide assembly 5 is adjacent to the outer side surface of the magnetic grating sensor body 21.

[0049] like Figure 8 As shown, on the basis of the above embodiment, further, the guide assembly 5 includes a sleeve 51 and a guide ring 52, and there are multiple sleeves 51. The guide ring 52 is installed between the sleeves 51, and the inner side of the guide ring 52 is in contact with the outer side of the quasi-magnetic grating sensor body 21. Since the overall length of the quasi-magnetic grating sensor body 21 is relatively long, radial vibration may occur during operation to affect the normal operation of the sensor. The guide ring 52 can reduce the impact of vibration, and the guide ring 52 is made of polyoxymethylene (POM) material. The guide ring 52 allows the quasi-magnetic grating sensor body 21 to always maintain contact with it during reciprocating motion, and the quasi-magnetic grating sensor body 21 has good working stability.

[0050] like Figure 1 , Figure 2 and Figure 6 As shown, based on the above embodiment, further, a sealing ring 6 is provided at one end of the housing 3 near the first opening, and the sealing ring 6 can prevent dust from entering the interior of the displacement sensor. A fixing member 4 is provided on the outside of the housing 3. The fixing member 4 is used to fix the entire displacement sensor at the working position.

[0051] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Fig.11 , Fig.12 and Fig.13As shown, when working, (1) the connecting part of the pull rod 19 is connected to the object to be measured through a universal joint, and the lead wire 13 on the LVDT sensor element 1 and the connecting wire on the magnetic grid sensor element 2 are respectively connected to an external computer; (2) when the object to be measured produces a linear displacement, the pull rod 19 is driven to move, and the pull rod 19 drives the iron core 191 to move back and forth in the channel 14 of the support frame 15. Since the primary coil 16 and the secondary coil 17 are installed on the support frame 15, when the iron core 191 moves back and forth, the magnetic field in the space changes to a certain extent. As the magnetic field in the space changes, the mutual inductance between the primary coil 16 and the secondary coil 17 will also change accordingly, and the secondary coil 17 will generate an induced electromotive force. 1 is different, the mutual inductance between the primary coil 16 and the secondary coil 17 is also different, and the induced electromotive force generated by the secondary coil 17 is also different, so that the displacement of the iron core 191 is converted into a voltage signal and output through the lead wire 13, thereby realizing the displacement measurement of the measured object; (3) At the same time, since the pull rod 19 on the LVDT sensor element 1 is fixedly connected to the quasi-magnetic grating sensor body 21, the quasi-magnetic grating scale 22 also moves synchronously. The quasi-magnetic grating probe 23 fixedly installed on the end cover 12 is composed of a permanent magnet and a sensitive element. The permanent magnet is used to generate an excitation magnetic field, and the sensitive element detects changes in the magnetic field. The quasi-magnetic grating scale 22 is made of magnetic conductive material. When the pull rod 19 on the LVDT sensor element 1 moves, the quasi-magnetic grating scale 22 moves synchronously. As it moves, the quasi-magnetic scale 22 can modulate the magnetic lines of force of the permanent magnet to achieve the effect of detecting displacement; (4) the two sets of data measured by the LVDT sensor element 1 and the quasi-magnetic scale sensor element 2 are respectively transmitted to the dedicated monitoring program of the external computer, and the two sets of data are judged. When the judgment data is wrong, a sensor error alarm message is sent, and when the judgment data is correct, the final data is output; the specific working process is that the LVDT sensor element 1 and the quasi-magnetic scale sensor element 2 respectively input the data measured within 1 second into the external computer and then run the monitoring program. After multiple steps of inspection, the reliability of the obtained data is improved and which sensor has a fault is judged. First, the LVDT sensor element is judged. 1 Whether the data obtained exceeds the range, if the conditions are met, calculate whether the root mean square of this group of data is greater than the maximum root mean square, so as to check whether there is a sudden change. If the conditions are not met, the monitoring program will ask whether there is a large displacement. After confirmation, it will proceed to the next step, and then compare whether the actual fluctuation frequency is greater than the maximum fluctuation frequency, so as to check whether the LVDT sensor element 1 has abnormal fluctuations due to a fault. If any of the above three points is not met, it will switch to the input data of the magnetic grating sensor element 2 and detect the data in the same steps. If the above three points are met, it can be determined that the LVDT sensor element 1 is normal, and then calculate whether the static deviation of the two sensor data is greater than the maximum static deviation, so as to judge whether the magnetic grating sensor element 2 is normal.

[0052] The above are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereby. It should be understood by those skilled in the art that various changes, modifications, substitutions and deformations may be made to these embodiments without departing from the principles and purposes of the present invention, and all of them should be included in the protection scope of the present invention. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A non-similar redundant intelligent displacement sensor, characterized in that: It comprises a shell, an LVDT sensor element and a quasi-magnetic grating sensor element, wherein a first opening is provided at one end of the shell, an LVDT sensor element is fixedly installed inside the shell, a quasi-magnetic grating sensor element is installed between the LVDT sensor element and the shell, the LVDT sensor element and the quasi-magnetic grating sensor element are nested and slidably connected with each other, and the quasi-magnetic grating sensor element slides back and forth along the length direction of the LVDT sensor element; the LVDT sensor element comprises an LVDT sensor body, an end cover, a lead wire, a support frame, a primary coil, a secondary coil, a pull rod and an iron core, a second opening is provided at one end of the LVDT sensor body, a support frame is fixedly installed inside the LVDT sensor body, a channel is provided in the support frame, and the channel is distributed along the length direction of the support frame, a first groove is provided at the center position of the support frame, a primary coil is installed in the first groove, second grooves are provided at both ends of the support frame at the primary coil, a secondary coil is installed in the second groove, and a lead wire is provided at the end of the LVDT sensor body away from the second opening The LVDT sensor body is provided with an end cover near one end of the second opening, and a through slot connected to the channel is processed on the end cover. An iron core is installed at one end of the pull rod, and a connecting portion is provided at the other end of the pull rod. The end of the pull rod with the iron core is located in the channel, and the end of the pull rod with the connecting portion extends through the through slot to the outside of the LVDT sensor body, and the diameter of the pull rod is smaller than the diameter of the channel; the support frame is provided with a third groove near both ends, and a magnetic isolation gasket is installed in the third groove; the magnetic grating sensor element The component includes a quasi-magnetic grating sensor body, a quasi-magnetic grating scale and a quasi-magnetic grating probe. A third opening is provided at one end of the quasi-magnetic grating sensor body. A quasi-magnetic grating scale is fixedly installed inside the quasi-magnetic grating sensor body. The quasi-magnetic grating scale is sleeved on the LVDT sensor body. The inner side surface of the quasi-magnetic grating scale fits the outer side surface of the LVDT sensor body. The quasi-magnetic grating probe is fixedly installed on the end surface of the end cover away from the LVDT sensor body. A connecting line is provided on the quasi-magnetic grating probe, and the quasi-magnetic grating probe corresponds to the quasi-magnetic grating scale.

2. The non-similar redundant intelligent displacement sensor according to claim 1, characterized in that: One end of the pull rod with the connecting portion crosses the end of the magnetic grating sensor body away from the third opening and extends to the outside of the magnetic grating sensor body. The pull rod is fixedly connected to the magnetic grating sensor body by a fastener.

3. The non-similar redundant intelligent displacement sensor according to claim 2, characterized in that: The quasi-magnetic grating scale comprises a cylinder and a semi-cylinder, wherein the cylinder and the semi-cylinder are integrally formed, the semi-cylinder is made of a magnetic conductive material, and hollow grooves are processed on the semi-cylinder, and the hollow grooves are evenly spaced in the length direction of the semi-cylinder.

4. The non-similar redundant intelligent displacement sensor according to claim 3, characterized in that: The inner diameter of the semi-cylinder is larger than the inner diameter of the cylinder.

5. A non-similar redundant intelligent displacement sensor according to any one of claims 1 to 4, characterized in that: A guide component is provided on the inner side of the shell, the outer side surface of the guide component is in contact with the inner side surface of the shell, and the inner side surface of the guide component is adjacent to the outer side surface of the magnetic grating sensor body.

6. The non-similar redundant intelligent displacement sensor according to claim 5, characterized in that: The guide assembly includes a sleeve and a guide ring. There are multiple sleeves, and the guide rings are installed between the sleeves. The inner side surface of the guide ring is in contact with the outer side surface of the magnetic grating sensor body.

7. The non-similar redundant intelligent displacement sensor according to claim 6, characterized in that: A sealing ring is provided at one end of the shell close to the first opening, and a fixing piece is provided at the outer side of the shell.

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