Explosion-proof type well wall diameter measuring device

Abstract

The invention relates to an explosion-proof type well wall diameter measuring device which comprises a pipe shell, a centralizer, a measuring assembly, a telescoping device and a lower connecting rod,wherein the centralizer, the measuring assembly, the telescoping device and the lower connecting rod are arranged in the pipe shell coaxially. The measuring assembly comprises measuring arms with theends passing through the pipe shell and capable of contacting with a well wall to be measured all the time. The upper end of the measuring assembly is connected to a pneumatic cylinder through the telescoping device. A pressure sensor is mounted in the pneumatic cylinder. The lower end of the measuring assembly is fixedly connected with the pipe shell through the lower connecting rod. Aligning iscarried out by the centralizer, and the lateral displacements of the measuring arms are converted into the vertical displacement of a hydraulic cylinder piston by the mutual cooperation of the measuring assembly, the telescoping device and the like, thereby converting the change of the diameter of the well wall into the change of the pressure in the pneumatic cylinder. Signals are transmitted only by the pressure sensor. Because there are less electronic devices and exposed electronic circuit parts, the device has high safety performance in certain working conditions with flammable and explosive gases.

Description

technical field [0001] The invention relates to the field of well diameter measurement, in particular to an explosion-proof well wall diameter measurement device. Background technique [0002] Borehole rescue, as a new type of rescue method gradually developed in the field of mine emergency rescue in recent years, has been successfully used many times around the world. In order to ensure the smooth progress of the rescue process, it is necessary to monitor the changes in the diameter of the rescue well in real time and adjust the rescue plan in time. However, for some special conditions (such as gas leakage in mines), the existing diameter measurement device does not meet the requirements. Explosion-proof standards, with potential safety hazards. Contents of the invention [0003] The object of the present invention is to overcome the problems existing in the prior art, and provide an explosion-proof borehole wall diameter measurement device, which can complete borehole w...

AI Technical Summary

Problems solved by technology

In order to ensure the smooth progress of the rescue process, it is necessary to monitor the changes in the diameter of the rescue well in real time and adjust the rescue plan in time. However, for some special conditions (such as gas leakage in mines), the existing diameter measurement device does not meet the requirements. Explosion-proof standards, with potential safety hazards

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