High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve

Abstract

The invention relates to a high-pressure closing sealed detection table and a detection method for a liquefied petroleum gas cylinder valve, which belong to the technical field of detection instruments. The invention is characterized in that the high-pressure closing sealed detection table mainly consists of a main framework, a lifting mechanism, a side sealing degree mechanism, a back force mechanism, a sensor conversion mechanism and a gas exhaust mechanism. The method comprises the following steps that the test gas is mixed gas of 6 to 4 percent of hydrogen gas and 94 to 96 percent of nitrogen gas, and a gas-sensitive sensor detects the hydrogen gas. When an element to be detected has the leakage, the gas-sensitive sensor detects the hydrogen gas and generates electric signals to be output, the gas-sensitive sensor uploads the electric signals to an analog quantity module of a PLC, and the PLC firstly converts the electric signals into the PPM of the hydrogen gas, and then convertsthe electric signals into the leakage quantity (ml / h) according to the PPM thereof. The invention has the advantages that compared with a method of using a pressure difference sensor for detecting the leakage, the method of using the gas-sensitive sensor for detecting the leakage greatly shortens the detection time, improves the detection efficiency, and has obviously improved efficiency and has high precision particularly for 100 percent detected products.

Description

technical field [0001] The invention belongs to the technical field of detection instruments. Background technique [0002] At present, according to GB7512-2006 "Liquefied Petroleum Gas Cylinder Valve Testing Standard", manufacturers of liquefied petroleum gas cylinder valves in my country use water to test the air tightness of liquefied petroleum gas cylinder valves. Observe whether there are bubbles generated, and judge the degree of leakage by the number of bubbles generated within a certain period of time. This method is simple to operate, does not require high skills of operators, and can determine the specific location of the leak. However, this method is affected by human factors and has large errors. It cannot perform quantitative analysis on the leak, and cannot realize production automation. Production The efficiency is low, and at the same time, surface treatment such as drying and anti-corrosion is required for the tested workpiece, which increases the cost of te...

AI Technical Summary

Problems solved by technology

This method is simple to operate, does not require high skills of operators, and can determine the specific location of the leak. However, this method is affected by human factors and has large errors. It cannot perform quantitative analysis on the leak, and cannot realize production automation. Production The efficiency is low, and at the same time, surface treatment such as drying and anti-corrosion is required for the inspected workpiece, which increases the inspection cost

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