Special tool and method for disassembly and assembly of high-pressure self-sealing manhole

Abstract

The invention relates to a demounting and mounting method and a demounting and mounting tool, in particular to a special tool and method for demounting and mounting of a high-pressure self-sealing manhole. The special tool comprises a chain block, a cross beam used for fixing the chain block and a stand column used for supporting the cross beam. The special tool is characterized in that a locating pin matched with a bolt hole, for fixing a four-element ring, in the circumference of the manhole is fixed to one end of the cross beam; a sleeve is fixed to the upper end of the stand column used for supporting the cross beam; the chain block is mounted on the cross beam through a pulley set; a thread matched with a threaded hole, for mounting of a lifting screw, in a manhole sealing cover is arranged at one end of a take-out rod; and a lifting ring matched with chain block is fixed to the middle of the take-out rod. The demounting and mounting tool and method have the beneficial effects of being simple in structure, convenient to use, high in demounting and mounting efficiency, good in safety and the like and are especially suitable for demounting and mounting of the inner-sealing high-pressure container manhole.

Description

technical field [0001] The invention relates to a disassembly method and a disassembly tool, in particular to a special tool and method for disassembly of a high-pressure self-sealing manhole. Background technique [0002] There are manholes for inspection and maintenance on the high-pressure vessels. At present, the commonly used manhole structures include built-in self-sealing manholes, four-ring self-sealing manholes, elliptical self-sealing manholes, and flange forced sealing manholes. For the four-ring self-sealing manhole, the sealing structure is composed of a restraining ring, a four-joint ring installed in the annular groove in the manhole, a sealing pressure pad and a sealing cover. During the maintenance process, the restraining ring is first disassembled, Then after taking out the four-way ring and the sealing pressure pad, the sealing cover can be taken out. For high-pressure heaters used in power plants or chemical companies, since the pressure in the high-pre...

AI Technical Summary

Problems solved by technology

For high-pressure heaters used in power plants or chemical companies, since the pressure in the high-pressure heater is above 20MPa, the thickness of the sealing cover in the self-sealing manhole of the four-ring ring is generally above 100mm, and the weight is above 150Kg. The gap between the sealing cover and the inner hole of the manhole cylinder is generally about 2mm. When taking out the sealing cover, a crane is generally required to cooperate. During maintenance, it usually takes 4 people to cooperate with each other for about 4 hours to disassemble the manhole. Well, it is time-consuming and labor-intensive, and when the sealing cover is separated from the manhole, the liquid in the high-pressure container will spray out from the gap between the manhole and the sealing cover, which will easily cause injury to the operator

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