Differential transformer type linear displacement sensor

Abstract

The invention discloses a differential transformer type linear displacement sensor. The sensor comprises a base; the base comprises a flange; the flange is provided with a rod body coaxially connectedwith the flange; an inner hole passing through the rod body is formed in the flange; the inner hole coaxially sleeves an armature assembly; the rod body is sequentially sleeved with a zero-position spacer and a pipe body; the pipe body is coaxially sleeved with a housing; a shielding spacer and two frame assemblies are sequentially arranged in the housing; the frame assemblies are separated fromeach other and positioned through a limiting sleeve; one end of the pipe body, which is far away from the flange, is sequentially sleeved with a spacer, an end cover and a tightening component, wherein the spacer is closely attached to the frame assembly, and the tightening component is in threaded connection with the tail end of the rod body and is used for fixing the position of the end cover; the frame assemblies are connected with wires; and the wires are led out through wire outgoing holes formed in the housing. With the differential transformer type linear displacement sensor of the invention adopted, the requirement of miniaturization is satisfied; the influence of the armature on a valve core is minimized; and work efficiency is improved. The differential transformer type linear displacement sensor has the advantages of small debugging workload, high practicability and popularization value.

Description

technical field [0001] The invention belongs to the technical field of detection equipment, and in particular relates to a differential transformer type linear displacement sensor. Background technique [0002] At present, displacement sensors are installed on electro-hydraulic servo valves to measure the displacement of the valve core and provide parameters for system fault diagnosis and prevention. However, due to the parallel structure and large diameter of the traditional dual-redundancy displacement sensors, the installation position is limited. At the same time, the structure of the fixed coil used in it leads to a complicated debugging process, which increases labor costs and economic costs. [0003] Although some displacement sensors of double-redundancy differential transformers adopt a series structure, their structure is a fixed ring structure, that is, the sensor body is fixed. In the early assembly and debugging process, it is necessary to adjust the position of...

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Problems solved by technology

[0002] At present, displacement sensors are installed on electro-hydraulic servo valves to measure the displacement of the valve core and provide parameters for system fault diagnosis and prevention. However, due to the parallel structure and large diameter of the traditional dual-redundancy displacement sensors, the installation position is limited. At the same time, the structure of the fixed coil used makes the debugging process more complicated, which increases the labor cost and economic cost

[0003] Although some displacement sensors of double-redundancy differential transformers adopt a series structure, their structure is a fixed ring structure, that is, the sensor body is fixed. In the early assembly and debugging process, it is necessary to adjust the position of the armature relative to the valve core to realize the zero position of the valve core. It is consistent with the zero output of the sensor, but because of the high pressure in the valve body, it needs to be disassembled and pressed repeatedly

Moreover, the spool of the electro-hydraulic servo valve will be worn after working for a period of time, which will also cause zero position offset. When the zero position is corrected, the electro-hydraulic servo valve needs to be disassembled again for adjustment. At the same time, due to the assembly and debugging environment of the electro-hydraulic servo valve The requirements are high and it needs to be carried out in the ultra-clean workshop, so the electro-hydraulic servo valve must be returned to the factory for processing, so that the maintenance workload is huge

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