Pneumatic drainage device on steel cylinder pressure detection device and drainage method thereof

Abstract

The invention relates to the field of steel cylinder pressure detection, in particular to a pneumatic drainage device on a steel cylinder pressure detection device and a drainage method thereof. The pneumatic drainage device comprises a cylinder body positioning device and a water injection device, wherein a working position is arranged in the cylinder body positioning device; the water injectiondevice comprises a water injection rod, a water injection compacting head and a water injection driving cylinder; a sleeve hole is arranged on the water injection compacting head, a water flow channelis arranged in the water injection rod, the water flow channel penetrates through both ends of the water injection rod, the water injection compacting head is provided with a water flow hole, a gas-liquid separation step with a small upper part and a large lower part is arranged in the sleeve hole, the water injection compacting head is provided with an air inlet hole, the air inlet hole is arranged below the gas-liquid separation step, and a communicated air flow gap is left between the water injection rod below the air inlet hole and the water injection compacting head. According to the scheme of the invention, the air in the cylinder body can be completely exhausted during water injection, and the pressure remains stable in the pressure maintaining process.

Description

technical field [0001] The invention relates to the field of cylinder pressure detection, in particular to a pneumatic drainage device on a cylinder pressure detection device and a drainage method thereof. Background technique [0002] In accordance with international standards and national standards, the steel seamless gas cylinders, refillable welded gas cylinders, aluminum alloy seamless gas cylinders and winding gas cylinders shall be subjected to hydrostatic testing, especially the liquefied petroleum gas cylinders. for important. [0003] According to the provisions of GB / T9251-2011 "Cylinder Hydraulic Pressure Test Method", 3.2MPa water should be injected into the cylinder, and the pressure should be maintained for 1 minute under airtight conditions, and the state of its pressure drop should be observed to determine whether the compressive strength of the cylinder is not. Qualified, to achieve the above requirements, the first is the sealing of the cylinder, followed...

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Problems solved by technology

[0012] It can be seen that when the water injection operation is performed, the steel cylinder is sealed first, and then the water injection operation is performed. This method will cause the air in the cylinder to pass through the pipeline and cannot be completely discharged, so that the cylinder is not completely filled during the water injection process, resulting in pressure holding process. The pressure is unstable and the product requirements are not up to standard

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