Oil pipe thread, internal thread, pitch diameter measuring device

Abstract

The utility model discloses a meter of pitch diameter of internal oil pipe thread, comprising a left guide block and a right guide block, two guide arms, a left measuring arm and a right measuring arm, a left measuring probe and a right probe, and a dial gauge; wherein, the two guide arms are spliced in two horizontal through holes in the left guide block and the right guide block; the left measuring arm and the right measuring arm are spliced in corresponding inclined hole in the left guide block and the right guide block respectively, and the two guide arms are vertical to the flat surface formed by the left measuring arm or the right measuring arm respectively; the right measuring arm is a hollow tube, in which a swing rod is arranged, and the end of the measuring rod of the dial gauge is overlapped on the upper end of the swing rod vertically through the mount of the dial gauge; a measuring probe is rotarily connected with the outboard of the lower end of the left measuring arm and the outboard of the lower end of the external side respectively. The meter can measure the pitch diameter of internal thread of oil pipe with different pipe diameter, and directly read the deviation values between the pitch diameter of internal thread measured and the standard pitch diameter to judge whether the oil pipe is qualified; the utility model has the advantages of compact size, light weight, portability, simple and convenient measurement, and high sensitivity.

Description

technical field [0001] The invention is a measuring instrument characterized by adopting a mechanical measuring method, in particular to a measuring instrument for measuring the pitch diameter of an internal thread of an oil pipe thread. Background technique [0002] Oil special pipes are important materials in the oil industry. At present, the quality of domestic oil special pipes is roughly: 3% to 5% of the drilled oil wells are scrapped due to poor quality pipes and other reasons, and about 80% of the pipes are damaged. Both occur at threaded connections. This is basically due to the poor thread processing quality of the oil pipe joint, and the individual parameters of the thread have not met the technical requirements, resulting in poor connection strength and sealing performance of the pipe, which cannot meet the use requirements. An effective measure to reduce such problems is to improve the quality of oil pipe threads and ensure that the parameters of pipe threads me...

AI Technical Summary

Problems solved by technology

This kind of detection is a so-called comprehensive detection method, which is relatively primitive and clumsy, and more importantly, it has the following deficiencies:

[0004] 1. Using thread ring gauge or plug gauge can only detect such a comprehensive parameter as the close distance of pipe thread, but cannot detect each individual parameter of pipe thread, and cannot make an accurate judgment on each individual parameter of pipe thread. The deviation and the deviation value cannot be reflected quantitatively, so it is impossible to control the machining accuracy of the pipe thread and improve the quality of the pipe thread during the production process

[0005] 2. It is easy to mistakenly judge a pipe thread that is unqualified for one or even two individual parameters as a qualified product only through comprehensive parameter evaluation, causing the quality of thread processing to lose control and burying quality and safety hazards

[0006] 3. Standard threaded ring gauges and plug gauges are difficult to manufacture and expensive to manufacture. Once worn out, they cannot be repaired and can only be scrapped

It is quite troublesome to purchase, transport and store as a inspection tool

[0007] 4. It is large in size and heavy in weight. It needs the assistance of aerial cranes to complete the detection of large pipe diameters. It is inconvenient to use. Sometimes a little carelessness when making up the buckle will strain the thread to be inspected.

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