Non-contact linear displacement sensor and linear displacement detection system

Abstract

The embodiment of the invention discloses a non-contact linear displacement sensor and a linear displacement detection system. The non-contact linear displacement sensor comprises a shell; a rear cover is fixed to the rear end surface of the shell; a front cover is fixed to the front end surface of the shell; a main shaft is arranged in the front cover and the rear cover in a penetrating manner; the two pieces of magnetic steel are embedded into the top surface of the main shaft; a Hall element is arranged at the top end of the shell through a circuit board and used for detecting change of magnetic field intensity; a resetting device is arranged at the first end of the main shaft in a sleeving mode and located in the side, facing the front cover, outside the shell; and a connecting deviceis used for making contact with a measured object. The linear displacement distance is calculated by detecting the change of a common magnetic field of the two pieces of magnetic steel through the Hall element, the structure simple, the cost is low, motion resistance of the main shaft is low, the linear displacement measuring precision is high, wearing is low, the service life is long, and the detection system suitable for the Hall element is additionally arranged, so that the Hall element can be protected, and the displacement detection quality is higher.

Description

technical field [0001] The invention relates to the field of automatic displacement detection, in particular to a non-contact linear displacement sensor. Background technique [0002] Linear displacement sensor is a component widely used in position signal feedback in automation control systems. Traditional linear displacement sensors are usually potentiometer type. By loading a certain voltage on the total resistance end of the potentiometer, and then outputting from the potentiometer The terminal samples the divided voltage signal to realize the function of position control. This kind of potentiometer type linear displacement sensor has one of the most fundamental defects, that is, because the brush at the output end of the potentiometer always maintains a certain pressure contact with the resistor body, and the brush will slide back and forth on the resistor body in the working state. This kind of sliding will cause the wear of the brushes and resistors and affect the st...

AI Technical Summary

Problems solved by technology

The core part of this type of sensor is a Hall element that detects changes in magnetic field strength and a magnet steel that generates a rotating magnetic field against the Hall element. The Hall sensor is mainly used in the detection field of angular displacement. When used for angle measurement, it can get Good measurement accuracy, but the accuracy will be poor when the Hall element is directly used for linear measurement

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