Underground pipeline inertia locator

Abstract

The invention relates to an underground pipeline inertial locator. The locator comprises two wheel train units connected to two sides of a measurement main body; each wheel train unit is provided witha main body mounting frame, at least three sets of supporting wheels, supporting arms, supporting arm frames, elastic pieces and sliding rails, and an extension rod assembly, wherein the at least three sets of supporting wheels, supporting arms, supporting arm frames, elastic pieces and sliding rails are in one-to-one correspondence, one ends of fixed arms and one ends of movable arms of the supporting arms are rotationally connected with the supporting wheels, the other ends of the fixed arms and the other ends of the movable arms of the supporting arms are rotationally connected with fixedarm frames and movable arm frames of the corresponding supporting arm frames respectively, and the sliding rails are horizontally supported on the fixed arm frames of the two wheel train units; the extension rod assembly is provided with at least three extension rods in one-to-one correspondence with the fixed arm frames, and the fixed arm frames are connected to the main body mounting frame through the extension rods; and the movable arm frames are in sliding connection with the sliding rails, and the elastic pieces are arranged between the fixed arm frames and the movable arm frames. According to the locator, the pipe diameter adaptive range is large, harmful torque is reduced, the problem of structural instability is solved, the service life is prolonged, the measurement precision is improved, and stability and safety of operation in a pipeline are facilitated.

Description

technical field [0001] The invention relates to the technical field of pipeline detection, in particular to an inertial locator for underground pipelines. Background technique [0002] The inertial locator for underground pipelines is an instrument for accurately measuring the three-dimensional position information of underground pipelines. [0003] The existing underground pipeline inertial locator can refer to the Chinese invention patent filed by the applicant on 2015.02.27 with the authorization announcement number CN104634373B, which discloses a pipeline detector centering device, which includes two measuring instruments at both ends of the device. A wheel train unit, which includes at least three sets of support wheels, support arms and slide rails in one-to-one correspondence, and a wheel train bracket, the support arm includes a fixed arm and a movable arm, and the wheel train bracket includes a fixed bracket , movable bracket and spring, the first end of the fixed ...

AI Technical Summary

Problems solved by technology

[0006] 1. Since the movable arms of the three supporting wheels located at the same end of the measuring instrument are fixedly connected to the movable arm bracket, and the movable arm bracket is fixedly connected to the movable arm bracket seat, when the three supporting wheels shrink toward the center, the three supporting wheels The movable arm of the wheel swings to the outside to drive the movable arm bracket connected to it to move, and then drives the movable arm bracket seat to move along the slide rail. Once there are protrusions or pits inside the pipe, the three supporting wheels will have different degrees of displacement. In this way, the displacements of the three fixed arm brackets will be different, but the displacement of the movable arm bracket is certain, which will easily affect the centering performance of the instrument in the pipeline and affect the measurement accuracy of the instrument;

[0007] 2. In order to be able to adapt to different pipe diameters, in the prior art, the first extension frame and the second extension frame are selected to be added to the fixed arm bracket and the movable arm bracket. Although it can adapt to multiple pipe diameter ranges, when fixed After the arm and the movable arm bracket are extended, when the support wheel shrinks, the angle between the component force exerted by the movable arm on the movable arm bracket and the horizontal direction increases, and the harmful moment increases. Due to the "self-locking phenomenon", the larger the angle , the more difficult it is to push the movable arm bracket seat, even after exceeding a certain angle, the movable arm bracket seat cannot be pushed, which will cause the movement of the support wheel to be jammed or even unable to move, resulting in the measuring instrument being stuck in the pipe;

[0008] 3. Once the first extension frame and the second extension frame are added, the center of gravity of the support wheel is improved. When the diameter inside the pipe diameter changes, the fixed arm and the movable arm are relatively far away, and the center of gravity of the support wheel drops. If the support If the drop of the wheel is too large, it is easy to cause the support wheel to reverse, that is, the center of gravity crosses the support point, so that the measuring instrument cannot run in the pipeline

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