Oil pipe thread size parameter detection method and equipment

Abstract

The invention relates to an oil pipe thread size parameter detection method and equipment. The method comprises the following steps: illuminating by using parallel light sources, collecting an upper section image and a lower section image of the oil pipe thread through bi-telecentric lenses and area array CCD digital cameras; extracting contour sub-pixel edge by using image processing software; and computing geometric parameters of the upper and lower section images. The detection equipment disclosed by the invention is mainly composed of a base, an image collection component a lifting guide rail mechanism and like components; the image collection component is composed of a bracket, two parallel LED illuminating light sources fixed on the bracket, two bi-telecentric lenses, two area arrayCCD digital monochromic cameras, and the image collection and processing software. By adopting parallel light sources, the telecentric lens can guarantee that the collected parts appearance images cannot distort along with the distance in a certain range, the measurement speed is fast, and a measurement result with comparatively high precision can be 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...

AI Technical Summary

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 problem is 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

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