Gas cylinder volume detection method and system based on 3D vision technology

Abstract

The invention discloses a gas cylinder volume detection method and system based on a 3D vision technology, and the method comprises the steps: placing a tested gas cylinder in a field of view, and carrying out the information collection of the tested gas cylinder; processing the collected information to obtain first information; judging whether the first information is correct or not, and if not,returning to adjust parameters and restarting; if the first information is correct, carrying out a water pressure test, and obtaining second information of the tested gas cylinder in a pressurized state and third information of the tested gas cylinder after pressure relief; and calculating volume parameters of the tested gas cylinder according to the second information and the third information. Through a non-contact means, the change of the outer wall size of the gas cylinder in a hydrostatic test is calculated in real time in detail, so that parameters such as volume elastic deformation andvolume residual deformation are obtained, the steel cylinder cannot be damaged, multiple groups of gas cylinders can be measured at the same time, the system has the advantages of high speed, simplicity and convenience in operation and the like, and the real-time monitoring and early warning of the quality state of the gas cylinder are realized.

Description

technical field [0001] The invention relates to the technical field of industrial quality inspection, in particular to a gas cylinder volume detection method and system based on 3D vision technology. Background technique [0002] Industrial gas cylinders are used in the filling of various high-pressure and high-risk gases, so the quality inspection of gas cylinders is very important. Hydrostatic testing is a common test method for comprehensively testing the comprehensive performance of gas cylinders. This method increases the internal pressure of the gas cylinder by injecting water into the gas cylinder, reaches a preset value, and then drains the water to relieve the pressure. During this process, the gas cylinder will be deformed, and the deformation is an important indicator for judging the quality of the gas cylinder. [0003] At present, there are two main measurement methods: internal measurement method and external measurement method. Among them, the internal measu...

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Problems solved by technology

Among them, the internal measurement method measures the change of water volume from the inside of the gas cylinder, so as to infer the change of the volume of the gas cylinder. Due to factors such as uneven production materials of the gas cylinder, the change of the water volume inside the gas cylinder may not be equal to the change of the volume of the gas cylinder. The measurement accuracy of the method is low

Usually, the external measurement method is based on the water jacket medium, by measuring the change of the external water jacket to calculate the change of the volume of the gas cylinder, and using the pressure sensor to weigh the calculation, this method is affected by the loss of the discharged water in the pipeline, resulting in reduced accuracy, another drawback That is, during the test process, it is necessary to repeatedly lift the gas cylinder into the water jacket, and also need to carry out airtightness testing on the water jacket, replenish water and other processes, and the efficiency is low

In addition, there are other non-contact external measurement methods, such as dry methods based on ultrasonic waves and 2D vision, which have the advantages of no need for water as a medium, easy operation, and no damage to gas cylinders, but there are also problems that the deformation of gas cylinders is too weak The measurement accuracy is difficult to meet the demand and other defects

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