Coil Field Shielded Proximity Sensors

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 touching 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 out ...

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.

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