CN-121977422-A - Magnetic induction displacement sensor and method

CN121977422ACN 121977422 ACN121977422 ACN 121977422ACN-121977422-A

Abstract

The invention discloses a magnetic induction displacement sensor and a method, wherein the displacement sensor comprises an electronic bin, a hexagonal nut, an external connector, an external wiring and a magnet, wherein the electronic bin comprises a bin seat, a bearing sheet and a main board chip, the main board chip comprises a power supply voltage stabilizing circuit, a current output circuit, a voltage output circuit, a zero point adjusting circuit, a temperature compensating circuit, a signal amplifying circuit, a negative pressure generating circuit, an induction signal processing circuit and a coil exciting circuit, the electronic bin adopts an external thread design and has flexible installation characteristic, and the main board chip combined by a plurality of circuits has the characteristic of high sensitivity while guaranteeing that the distance between an induction signal and the magnet is in a stable linear relation. The magnetic induction displacement sensor combines the advantages of the inductive sensor and the magnetic sensor, has stable and accurate measurement performance, has the characteristics of extremely strong environmental adaptability and expansibility, flexible and various installation modes, and has the function of penetrating nonmagnetic materials for measurement.

Inventors

WANG XINGJIE
WANG DONGFANG
LIANG LIJUN
ZHOU KENAN

Assignees

湖北米朗科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260227

Claims (10)

1. A magnetic induction displacement sensor, comprising: the magnetic induction displacement sensor comprises an electronic bin (1) serving as a main body structure of the magnetic induction displacement sensor, a hexagonal nut (2) screwed into the outer side surface of the electronic bin (1), an external connector (3) arranged at the center of the bottom of the electronic bin (1) and an external wiring (4) connected with the bottom of the external connector (3), wherein the electronic bin (1) presents a cylindrical structure with the outside wrapped by external threads; The electronic bin (1) comprises a bin seat (11) positioned at the bottom of the electronic bin (1), a carrying sheet (12) connected with the lower side of the top of the bin seat (11) by adopting a welding process, and a main board chip (13) embedded in a rectangular groove at the top of the carrying sheet (12); The main board chip (13) comprises a zero point adjustment circuit (134) for compensating the offset of installation and the initial influence of environment by setting a measurement starting reference point, a temperature compensation circuit (135) for counteracting the influence of temperature change on a displacement sensor measurement system, a negative pressure generation circuit (137) for generating a stable negative pressure signal, and a coil excitation circuit (139) for providing an excitation signal for a sensor magnetic induction coil.
2. A magnetic induction displacement sensor according to claim 1, characterized in that the electronics compartment (1) is selected from the group consisting of 18mm in diameter and 30mm in diameter.
3. A magnetic induction displacement sensor according to claim 2, characterized in that the external connection (3) can be connected with a waterproof connection and an aviation plug according to the field Jing Xuan.
4. A magnetic induction displacement sensor according to claim 3, characterized in that the external connection (4) is adapted to a current output mode, a voltage output mode and an RS485 output mode.
5. A magnetic induction displacement sensor according to claim 4, characterized in that the housing (11) and the receiving plate (12) are made of non-ferromagnetic material.
6. The magnetic induction displacement sensor according to claim 5, wherein the temperature compensation circuit (135) comprises a U4B operational amplifier, a thermistor RT1, a resistor R9, a resistor R10, a resistor R12 and a capacitor C14, and the thermistor RT1 is capable of sensing the environmental temperature change in real time to process the amplified signal in cooperation with a zero adjustment circuit.
7. The magnetic induction displacement sensor according to claim 6, wherein the negative pressure generating circuit (137) comprises a diode D1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, an oscillator U1 and a trigger U2, wherein the oscillator U1 can generate an oscillation signal with a fixed frequency, and the trigger U2 is used for outputting a time sequence stable control signal in cooperation with the oscillator U1, so as to avoid coil magnetic field reference deviation caused by excitation fluctuation; The coil excitation circuit (139) comprises a U7A operational amplifier and a magnetic induction coil BYQ1, and the magnetic induction coil BYQ1 is used for converting magnetic displacement into an electric signal.
8. A magnetic induction displacement sensor according to any one of claims 1-7, further comprising a magnet (5) for use as the magnetic induction displacement sensor and arranged on the measurement object, the magnet (5) having a default maximum operating temperature of 80 ℃, if a high temperature magnet having a maximum operating temperature of 250 ℃ is required to be replaced.
9. A method of using a magnetic induction displacement sensor according to any one of claims 1-9, comprising: s100, selecting a displacement sensor with corresponding specification according to an actual measurement range, and confirming whether a matched magnet (5) meets working condition requirements, checking the appearance of the sensor and the integrity of accessories, and ensuring that a shell is not damaged; S200, if the installation space is sufficient, fixing the magnet (5) on the measuring object in an axial installation mode, so that the moving direction of the magnet (5) is consistent with the detection axis of the displacement sensor; s300, if the installation space is limited, the side installation can be selected, and the characteristic curve is not influenced within the range of a few millimeters of offset; s400, corresponding wiring is carried out according to the output mode of the displacement sensor, firm connection and good contact of the wiring are ensured during wiring, and equipment faults caused by virtual connection and wrong connection are avoided; S500, connecting an external direct current power supply, ensuring normal power supply of the displacement sensor, waiting for stable operation of the displacement sensor for at least 15 minutes, and then adjusting the position of a measuring object to align a magnet (5) fixed on the measuring object with the displacement sensor so as to finish zero calibration; And S600, periodically checking the protection state of the electronic bin (1), and if the electronic bin is applied to complex environments such as dust, greasy dirt, chemical substances and the like, cleaning pollutants on the surface of the shell in time, so that the damage of internal elements caused by the reduction of protection level is avoided.
10. The magnetic induction displacement sensor of claim 1, characterized in that the temperature compensation circuit (135) comprises a temperature compensation formula that counteracts temperature drift as follows: Wherein, the Is a stable voltage signal processed by a temperature compensation circuit (135); Is an original amplified signal which is not compensated by a temperature compensation circuit (135), wherein alpha is a temperature compensation coefficient, and T is the ambient temperature during operation; Is the reference ambient temperature; The coil excitation circuit (139) has to provide high frequency sine wave or triangular wave excitation and establish the following physical model: Wherein E is the induced electromotive force generated by the magnetic induction coil BYQ1, N is the number of turns of the magnetic induction coil BYQ1, phi is the magnetic flux passing through the magnetic induction coil BYQ1, A is the effective sectional area of the magnetic induction coil BYQ1, t is the working time of the displacement sensor, and x is the space displacement; The magnetic field gradient is used for representing the change rate of magnetic induction intensity along with the spatial displacement; the moving speed of the magnet (5) relative to the magnetic induction coil BYQ 1.

Description

Magnetic induction displacement sensor and method Technical Field The invention belongs to the technical field of sensors, and particularly relates to a magnetic induction displacement sensor and a magnetic induction displacement sensor method. Background In various application scenes such as industrial automation, mechanical manufacturing, special environments, closed systems and the like, displacement and distance measurement and shaft and gear rotation speed measurement are key links for guaranteeing accurate operation of equipment and stable implementation of a process, along with development of industrial production to high precision, high reliability and complex working condition adaptability, higher requirements are put forward on performance of measuring equipment, a magnetic induction displacement sensor is used as a non-contact measuring device, by means of a unique working principle of the magnetic induction displacement sensor, the magnetic induction displacement sensor gradually becomes an important choice for displacement measurement in the scenes, the core is that advantages of an inductive sensor and a magnetic sensor are combined, a magnet is used as a detection target, continuous linear signal output is realized by sensing magnetic current change in the sensor caused by magnet movement, and further relevant parameter measurement is completed. Currently, there are various types of displacement measurement sensors on the market, including induction type sensors, traditional magnetic type sensors, inductive type sensors, etc., wherein the induction type sensors are widely applied in the industrial field, but the problem of sensitivity decline often exists at the end of the measurement range, although the traditional magnetic type sensors and the inductive type sensors have advantages, the traditional magnetic type sensors and the inductive type sensors are difficult to consider the various requirements of measurement precision, environmental adaptability, installation convenience, etc. when being used independently, in order to optimize the measurement effect, part of the technology tries to combine the principles of different types of sensors, the magnetic induction displacement sensors are developed under the background, and the magnetic induction displacement sensors can be detected through nonferromagnetic materials, have flexible installation modes, etc., so that the magnetic induction displacement sensors have certain application potential in complex industrial scenes. Disclosure of Invention In response to the above-identified deficiencies or improvements in the art, the present invention provides a magnetic induction displacement sensor. The range of the displacement sensor can be determined through the electronic bin of the cylindrical structure wrapped by the external threads, the displacement sensor can be fixed at a designated position through the hexagonal nut screwed in the outer side of the electronic bin, the position of the displacement sensor is finely adjusted so as to ensure stability and accuracy, the friction force of the displacement sensor is improved and the electronic bin is improved through the external joint arranged at the center of the bottom of the electronic bin, and different modes are selected for inputting the displacement sensor through the external wire connected with the bottom of the external joint. In order to achieve the above object, according to a first aspect of the present invention, there is provided a magnetic induction displacement sensor comprising: the electronic bin used as the main body structure of the magnetic induction displacement sensor, a hexagonal nut screwed into the outer side surface of the electronic bin, an external connector arranged at the center of the bottom of the electronic bin and an external wire connected with the bottom of the external connector, the electronic bin is in a cylindrical structure with the outside wrapped by external threads; The electronic bin comprises a bin seat positioned at the bottom of the electronic bin, a bearing sheet connected with the lower side of the top of the bin seat by adopting a welding process, and a main board chip embedded in a rectangular groove at the top of the bearing sheet; The main board chip comprises a zero point adjusting circuit for compensating the offset of installation and the initial influence of the environment by setting a measurement starting datum point, a temperature compensating circuit for counteracting the influence of temperature change on a displacement sensor measurement system, a negative pressure generating circuit for generating a stable negative pressure signal and a coil exciting circuit for providing an exciting signal for a sensor magnetic induction coil. Further, the diameter of the electronic bin can be 18mm or 30mm. Further, the external connector can be a waterproof connector and an aviation plug according to the use field Jing Xuan. Further, the ex