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Method and device for detecting thread size parameter of oil tube

A thread size and parameter detection technology, applied in the field of digital image acquisition of parts, ordinary thread and other parts size detection fields, can solve the problems of easy wear of the probe, low degree of automation, complicated operation, etc., which is conducive to accurate processing and low installation cost. , the effect of simple operation

Inactive Publication Date: 2019-06-25
陈卫
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Problems solved by technology

The contact measuring instrument realizes the measurement of the thread through the self-centering method of two hemispherical probes. The problem is that the processing requirements for the probe are extremely high, the probe is easy to wear and fall off during use, and three needles are required to measure the thread. And other auxiliary means, low efficiency, cumbersome operation
The optical aiming type is mainly measured by optical instruments such as a universal tool microscope. The main problems are that it is aimed through the human eye, there are many human error factors, low automation, low efficiency, and long-term use causes human eye fatigue. Universal thread measuring instrument Cannot be measured online

Method used

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  • Method and device for detecting thread size parameter of oil tube

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Embodiment 1

[0033] Camera calibration measurement, install the component with known contour size on the processing station of the part to be measured, adjust the proper position so that the upper and lower edges fall within the angle of view of the two cameras, take a contour image, set the camera gain and shutter time, and collect the image. Two gray-scale digital images of the upper and lower sections of the calibration part are obtained, the edge contours of the two images are extracted, and the positional relationship between the two cameras is calibrated through the relative positions of the contour lines.

Embodiment 2

[0035] Thread geometry measurement: place the thread to be measured while keeping the position of each device, collect two grayscale images of the upper and lower interface of the thread, extract the edge of the thread contour in the image, find the upper and lower edges of the thread teeth, and calculate the equation of the straight line where the upper edge and the lower edge are located , the distance between the two straight lines is the tooth height of the thread; find a parallel straight line between the two straight lines, which has an intersection point with the edge of the threaded gear, and the distance between each skipped intersection point is the pitch; use the extracted contour edge and Use calibration to calculate its cone angle and diameter. The above parameters, or the calibration data used, are all calculated geometrically to obtain the geometric dimension parameters of the thread section.

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Abstract

The invention relates to a method and device for detecting the thread size parameter of an oil tube. Parallel light sources are used for illumination. Double-telecentric lenses and area array CCD digital cameras are used for collecting images of an upper cross section and a lower cross section of the thread of an oil tube; image processing software is used for extracting a contour sub-pixel edge;and geometric parameters of the images of the upper cross section and the lower cross section are calculated. The detecting device mainly comprises a pedestal, an image collecting component, a liftingrail mechanism and the like. The image collecting component includes a bracket, two parallel LED illumination light sources fixed on the bracket, two double-telecentric lenses, two area array CCD digital cameras, and image acquisition and processing software. According to the invention, with the parallel light sources and the telecentric lenses, collected part appearance images do not distort with the distance within a certain range; the measurement speed is fast; and the measurement result with higher precision is obtained.

Description

technical field [0001] The invention belongs to the technical field of mechanical part detection and relates to a method and equipment for acquiring digital images of parts, which can be used for dimension detection of ordinary threads and other parts. Background technique [0002] The oil pipe is a pipeline that transports crude oil and natural gas from the oil and gas layer to the surface after the drilling is completed. It is used in a large amount in the oil field, and the quality of the oil pipe thread directly affects the normal production of the oil field. However, in the current production process of oil pipes, manual methods are commonly used to measure the thread size of oil pipes. Thread gauges and taper gauges are used together with a series of tools for manual inspection. This measurement method has low work efficiency and has a lot of human influence factors. [0003] How to quickly and accurately measure the size of the oil pipe thread space geometry is an urg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B11/02G01B11/14G01B11/26G01B11/08
Inventor 陈伟
Owner 陈卫
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