Circle supporting device for the inner side of a thin-wall metal pipeline

Abstract

The invention discloses a circle supporting device for the inner side of a thin-wall metal pipeline. The circle supporting device comprises a cam shaft body capable of rotating and a plurality of pushrod assemblies extending and retracting along the cam shaft body, and the cam shaft body and the push rod assemblies are covered with shells. The cam shaft body comprises a rotating shaft arranged inthe middle. The two sides of the rotating shaft are each provided with a windmill-shaped cam with a plurality of fan blades evenly distributed in the circumferential direction, and the two cams on the two sides are arranged in a staggered mode at a certain angle. Each push rod assembly is sleeved with a spring, and a reset spring clamping groove is formed in each shell. The reset spring clampinggrooves enable the springs to be in a compressed state all the time, and then one end of each push rod assembly is driven to abut against the corresponding fan blade all the time. The outer sides of the shells are provided with a hydraulic cylinder used for providing power for rotation of the cam shaft body. The circle supporting device is ingenious in design, easy and convenient to use, high in accuracy and capable of being applied to inner side anti-deformation supporting when the outer sides of metal pipelines whose inner side areas are unreachable via various paths are welded, and the inner diameter and the roundness of the pipelines are guaranteed.

Description

technical field [0001] The invention relates to the field of metal thin-walled pipeline welding, in particular to an inner rounding device for thin-walled metal pipelines, which is used for controlling the welding deformation outside the unreachable inner side of the pressure-bearing pipeline of petrochemical containers and nuclear power equipment. Background technique [0002] Metal pipes are widely used in petrochemical and nuclear power manufacturing fields as fluid-carrying shells. The heat exchange pipes of nuclear island pressure vessel equipment in nuclear power plants operate in the environment of high temperature, high pressure and high-speed flow of internal media, and their roundness and diameter have an important impact on the pressure life and flow rate. However, in the process of pipe connection, the butt welding of pipes and the welding of pipe outer wall parts will cause problems such as thermal shrinkage deformation, resulting in pipe ellipse and smaller dia...

AI Technical Summary

Problems solved by technology

However, in the process of pipe connection, pipe butt welding and pipe outer wall parts welding will produce heat shrinkage deformation, which will lead to problems such as pipe ellipse and diameter reduction, and affect the positioning size of pipe wall welding parts

Usually, for the butt welding of pipes with larger diameters that can enter people, the welding deformation can be balanced by alternating welding on both sides of the pipe inside and outside, and before welding, personnel can use tools to support the inside of the pipe to control the roundness of the pipe; When welding small pipes, its own rigidity can prevent welding shrinkage and deformation; when welding thin-walled pipes with an inner diameter of about 100-400mm, the diameter of the pipe cannot meet the requirements for personnel to enter, and after butt jointing, only the outer side can be welded, and the rigidity of the pipe is low. Its own strength cannot resist the shrinkage and deformation caused by the outer welding, and the weld seam will collapse unevenly inward during the welding high-temperature cooling process, resulting in elliptical roundness and smaller diameter

For the above problems, there is no good way to control the welding deformation of thin-walled pipes in the prior art

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