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Sensor-based internal thread detection method for pipe fittings, pipe fitting screening method and system

A detection method and sensor technology, applied in the field of internal threads, can solve the problems of small size threads and low thread depth detection accuracy, and achieve the effect of high-efficiency online detection and strong compatibility

Active Publication Date: 2022-06-28
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a sensor-based internal thread detection method for pipe fittings, a pipe fitting screening method and a system to solve the problems of low detection accuracy for small-sized threads and thread depths in existing internal thread detection methods

Method used

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  • Sensor-based internal thread detection method for pipe fittings, pipe fitting screening method and system
  • Sensor-based internal thread detection method for pipe fittings, pipe fitting screening method and system
  • Sensor-based internal thread detection method for pipe fittings, pipe fitting screening method and system

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Embodiment 1

[0053] In practical engineering, there is often a problem that the wall thickness of the pipe fittings along the radial direction is not uniform due to factors such as processing errors, so that the inner and outer walls of the pipe fittings are not coaxial. image 3 Shown is a schematic diagram of a pipe fitting where the inner and outer walls are not coaxial. Aiming at the detection of the inner thread of the pipe whose inner and outer walls are not coaxial, this embodiment discloses a sensor-based method for detecting the inner thread of the pipe. The inner thread of the pipe to be tested in this embodiment is a straight thread, that is, the Internally threaded holes are circular holes of equal diameter. The method includes the following steps:

[0054] Step 1, determine the axis position of the outer wall of the pipe to be tested;

[0055] In this embodiment, the pipe to be tested is preferably passed through the center of the circle in the space coordinate system. Speci...

Embodiment 2

[0068] In this embodiment, the inner thread of the pipe to be tested is a tapered thread, that is, the inner threaded hole of the pipe to be tested is tapered, such as Figure 5 shown. The difference between the internal thread detection method of this embodiment and Embodiment 1 is:

[0069] Step 3, when the inner circle of the pipe to be measured is conical, the horizontal position of the horizontal distance sensor is adjusted in real time during the axial movement of the horizontal distance sensor along the axis of the pipe to be measured. Make sure that the inner thread surface of the pipe to be tested is within the range of the horizontal distance sensor.

[0070] The detection method of the invention solves the problem that the traditional detection method cannot determine the axis of the inner wall of the workpiece when the inner and outer walls of the workpiece are not coaxial due to factors such as machining errors, so that the measured pitch diameter of the thread i...

Embodiment 3

[0073] The present embodiment discloses a method for screening pipe fittings based on a sensor. The method is used to screen out qualified and unqualified pipe fittings with internal threads. The method includes the following steps:

[0074] Step 1, determine the specification type of the pipe to be tested, the specification type in this embodiment includes the outer diameter, inner diameter, wall thickness and height of the pipe to be tested;

[0075] This embodiment specifically includes: a vertical distance measuring sensor 11 is arranged above the pipe to be measured, and the vertical distance sensor 11 moves from a point outside the outer wall of the pipe to be measured to the outer wall of the pipe to be measured along a horizontal direction intersecting with the axis of the outer wall of the pipe to be measured. At another point outside, the specification type of the pipe to be measured is obtained according to the signal change of the vertical ranging sensor.

[0076] ...

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Abstract

The invention discloses a sensor-based internal thread detection method of pipe fittings, a pipe fitting screening method and a system. The detection method firstly adjusts the position between the horizontal ranging sensor and the pipe fitting to be tested, so that the optical axis of the horizontal distance measuring sensor can reach the pipe fitting to be measured The stop of the internal thread; then the pipe to be tested rotates around the axis of its outer wall, and the distance between the axis of the outer circle of the pipe to be tested and the axis of the inner circle is obtained according to formula (1). According to the distance and the axis of the outer wall of the pipe to be tested position, to obtain the axis position of the inner circle of the pipe to be tested; move the horizontal ranging sensor from one end of the pipe to be tested along the axis direction of the inner wall of the pipe to be tested to the other end of the pipe to be tested, and obtain the measured thread profile of the pipe to be tested. The detection method of the invention solves the problem that the traditional detection method cannot determine the axis of the inner wall of the workpiece when the inner and outer walls of the workpiece are not in the same axis due to factors such as machining errors, so that the measured pitch diameter of the thread is inaccurate and affects the detection accuracy.

Description

technical field [0001] The invention belongs to the technical field of internal threads, and relates to a sensor-based detection method for the internal thread of a pipe fitting, a pipe fitting screening method and a system. Background technique [0002] Threads are widely used in high-pressure gas, liquid transmission pipelines, and high-strength drilling tools because of their tight thread pair connection, good sealing performance, thicker threaded pipe wall, and strong torque transmission capacity and pressure resistance. In the process of threading, thread detection is an important link to ensure the quality of threading. The external thread is easy to observe because of its threaded part, and it has mature detection technology whether using contact or non-contact methods. The internal thread is smaller and gradually changed because the thread is on the inside. At present, contact detection methods are often used, such as thread gauges and needle detectors. When the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/34B07C5/36F16M11/04F16M11/18
CPCB07C5/34B07C5/361F16M11/046F16M11/18
Inventor 田东庄董萌萌陈彦宇周春田宏杰王亚波米陇峰荣明达
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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