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Coil magnetic field shielding type proximity sensor

A technology of proximity sensor and coil magnetic field, applied in instruments, electromagnetic measuring devices, using electromagnetic means, etc., can solve the problems of inconvenient aircraft installation and bracket design, and achieve the effect of enhancing the overall rigidity, small temperature coefficient, and good stability

Active Publication Date: 2018-12-14
CHENGDU KAITIAN ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the sensor is installed, it is required that no magnetic substances are allowed within a certain range near the sensing end of the sensor, which limits the application of the sensor to a certain extent and causes inconvenience to the installation of the aircraft and the design of the bracket.

Method used

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  • Coil magnetic field shielding type proximity sensor
  • Coil magnetic field shielding type proximity sensor
  • Coil magnetic field shielding type proximity sensor

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the scope of the described embodiments.

[0016] refer to figure 1 , figure 2 . In the embodiment described below, a magnetically shielded inductive proximity sensor includes: an inductive component 5 composed of a coil winding 8 and an iron core 7 , and a non-magnetic cylindrical socket 2 matched with the inductive component 5 . Among them, the outer circle of the non-magnetic cylindrical shell 1 and the outer circle of the non-magnetic cylindrical socket 2 are welded to form an all-metal sealing body, which aims to improve the anti-corrosion performance and electromagnetic protection ability of the sensor. The induction component 5 is packaged at the inlet end of the non-magnetic cylindrical shell 1, and its lead wire passes through the wire hole of the T-shaped spring seat 4 to connect with the non-magnet...

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Abstract

The invention discloses a coil magnetic field shielding type proximity sensor, and aims to provide the proximity sensor with high reliability, high electromagnetic compatibility and a magnetic shielding function. According to the technical scheme, an induction assembly (5) is packaged in the inlet end of a non-magnetic cylindrical shell (1), and a lead of the induction assembly penetrates througha wire passing hole of a T-shaped spring base (4) to be connected with a non-magnetic cylindrical socket (2) which is packaged at the other end of the non-magnetic cylindrical shell; a spring (7) is fixed in a sealed cavity formed by a sealing disc on the tail part of the non-magnetic cylindrical socket through an end circular disc of the T-shaped spring base; the induction assembly generates an alternating magnetic field for leading an inductive signal of the induction assembly to the non-magnetic cylindrical socket; when a metal target approaches the magnetic field and reaches the inductivedistance, a change eddy current is generated in the metal target, and a control device is triggered and controlled, so that the eddy current is processed and converted into a switching signal by a post-stage switching circuit and an amplification output circuit.

Description

technical field [0001] The invention relates to an inductive proximity sensor with a magnetic shielding function. Background technique [0002] The proximity sensor is a switch-type sensor (that is, a non-contact switch), which replaces contact detection methods such as limit switches to detect the position without contacting the detection object. According to the different principles of detecting objects, proximity sensors can be divided into: inductive proximity sensors, capacitive proximity sensors, magnetic proximity sensors, Hall proximity sensors, etc. Inductive proximity sensors are only sensitive to metal objects, so inductive proximity sensors cannot be applied to non-metallic object detection. At the same time, since the alternating magnetic field generated by the high-frequency oscillating coil is scattered, when the metal object is constantly approaching the front end of the sensor, it will trigger the change of the sensor state, and the sensor will also send ou...

Claims

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Application Information

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IPC IPC(8): G01B7/00
CPCG01B7/003
Inventor 周清刘杰罗进罗静白建君王林黄东
Owner CHENGDU KAITIAN ELECTRONICS
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