SU1415036A1 - Variable-resistance displacement transducer - Google Patents

Abstract

This invention relates to a measurement technique. The goal is to improve the accuracy, reliability and durability of a rheostat linear displacement sensor by eliminating the sliding current collection contact. This sensor contains resistive element 2 placed in case I, applied to the surface of return spring 3, made conical, and a collector element, made in the form of an electrically conductive plate 7, which is fixed in the case perpendicular to the spring axis on the side of its end face of larger diameter. The end of the smaller diameter of the spring 3 interacts with the measuring rod, ensuring it is springing relative to the body 1 of the sensor. When the rod moves, the end of which is intended to interact with the object being monitored, the spring 3 is compressed, which leads to shunting a section of the resistive element 2 of the appropriate length due to its contact with the surface of an electrically conductive plate 7..1 Cp. f-ly, 1 ill. Yu

Description

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The invention relates to a measurement technique and can be used to measure linear displacements.

The aim of the invention is to improve the accuracy, reliability and durability of a rheostat linear displacement sensor by eliminating the sliding current collection contact.

The drawing shows schematically the design of a rheostat displacement linear displacement sensor.

The sensor contains a housing I, in which a resistive element 2, made in the form of a resistive layer of a spring 8 worn on the surface of the returnable surface, or in the form of non-insulated wire, wound on this rod, is placed. The resistive element 2 is about the distance from the spring surface by a layer of insulation (not shown), for example, a lioHKHM layer of a non-conducting lacquer

The return spring 3 is filled with a tonic spring and, with its small diameter, interacts with stem 4 through stop 5, into which the end of the stem is screwed, providing podruzhenie rod relative to the sensor body 1. The opposite end of the stem 4, passing through the guide - to | bushing 6, is intended to interact with the object of control (not shown) -. The second end of the return spring having a larger diameter. It is turned towards the contact element of a rheostat sensor made in the form of an electrically conductive plate 7 fixed in the housing 1 perpendicular to the spring axis. Electrical terminals 8 and 9 of the resistive element are fixed in the wall of the housing I of the sensor.

The sensor works as follows

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When the control object moves in the X direction, the stem 4 moves along with the stop 5, which results in compression of the return spring 3. Depending on the magnitude of the movement, the length of the portion of the resistive element 2 applied to the surface of the spring 3 and coming into contact with the surface plate 7, which shunts this area. Due to this, increasing the resistance of the resistive element 2 between its terminals 8 and 9 decreases with increasing displacement. The absence of a sliding contact increases the reliability, durability and accuracy of a linear displacement transducer.

Claims (2)

1. A linear motion sensor, comprising a housing, resistive and contact elements housed therein, and a rod spring-loaded relative to the housing using a return spring, designed to interact with a controllable object, characterized in that, in order to improve accuracy, reliability and durability, the returnable the spring is made conical and B3ti- interacts with the rod with its end face of a smaller diameter, the contact element is designed as an electrically conductive plate fixed in the housing perpendicular to the axis dinners on the side of its larger diameter end, an insulation layer is applied to the spring surface, and a resistive element is placed on the surface of this layer. 2. The sensor according to claim 1, which is different from the fact that the resistive element is made in the form of uninsulated wire wound on a spring.