Method and device for detecting gyration period of diaphragm gas meter based on image acquisition

Abstract

Provided are a method and a device for detecting a gyration period of a diaphragm gas meter based on image acquisition. Based on an original diaphragm gas meter calibrating device which is based on a sonic nozzle, a camera and an image acquisition and processing module are added. The camera and the image acquisition and processing module are fixed on a meter clamping component of the diaphragm gas meter calibrating device which is based on a sonic nozzle. The camera is on the right upper end of a diaphragm gas meter air inlet. An image in which an oscillating bar and a connecting rod are exposed is acquired and is used as a comparison template. After the image acquisition and processing module identifies the camera, and when the shot image in which the oscillating bar and the connecting rod are exposed can be matched with the comparison template, the interval of acquisition time is the gyration period of the diaphragm gas meter. The identification processing steps of the image acquisition and processing module comprise: (1) converting a grey-scale map; (2) performing image binaryzation; (3) and identifying images based on template matching. The detection method solves a problem that detection difficulty of to-and-fro movement period of reciprocating pieces in a diaphragm gas meter is large.

Description

technical field [0001] The invention relates to the field of membrane gas meters, in particular to a method and device for detecting the rotation period of a membrane gas meter. Background technique [0002] Membrane gas meters are used to measure the consumption of fuel gases such as coal gas and natural gas. Membrane gas meters play an important role no matter for gas supply companies or household users. [0003] The basic working principle of the membrane gas meter is: when the flowing gas passes through the gas meter, it is blocked by the pipeline friction and the internal structure of the gas meter, and the gas entering the gas meter will generate a pressure difference at both ends of the gas meter inlet and outlet. The pressure difference drives the diaphragm of the diaphragm gas meter to move in the metering chamber, and drives the gas distribution mechanism to coordinate gas distribution, so that the movement of the diaphragm can be continuously reciprocated in a str...

AI Technical Summary

Problems solved by technology

However, it is difficult to detect the reciprocating motion of the crank-link mechanism in the current multi-meter series detection commonly used, and the detection of a motion cycle of the crank-link mechanism requires the addition of complex mechanical and motion control components, so the detection of the membrane gas meter rotation The cycle approach has yet to be developed

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