Machine set for producing medium-caliber straight-seam double-sided submerged-arc welding steel pipe and forming method of steel pipe

Abstract

The invention relates to a machine set for preliminarily forming and processing a steel pipe and a forming method, which is designed for solving the problems that the pipe body is easy to form a peach-shaped tip when the homogeneous machine set is formed and the like. The machine set comprises a lower crossbeam, a base and a frame, wherein a worm gear reduction box is arranged at two ends of the lower crossbeam; the worm gear reduction box is connected with a worm gear speed reducer by a coupling connecting rod; a lower box and an upper box are arranged on the frame; a propulsion connecting assembly is arranged under the lower box; the propulsion connecting assembly is connected with the worm gear reduction box by a connecting guide screw; a lower roller seat is arranged on the lower box and connected with a connecting plate; the lower roller seat is equipped with a swing connecting gear, a bull gear and a pinion, and the pinion is connected with the worm gear speed reducer; the worm gear speed reducer is arranged at two ends of the lower box; the worm gear speed reducer is connected with the propulsion connecting assembly by the guide screw; and an upper structure such as the upper box and the like is basically the same as a lower structure such as the lower box and the like. The machine set has the advantages of downward close-mouth of the steel pipe and no peach-shaped tip. The invention regards to the machine set for producing the medium-caliber straight-seam double-sided submerged-arc welding steel pipe and the forming method of the steel pipe.

Description

Technical field: [0001] The invention relates to a unit and a forming method for preliminary forming processing of Φ219mm-Φ711mm steel pipes. Background technique: [0002] The existing medium-diameter straight seam steel pipe ERW high-frequency electric resistance welded steel pipe body is formed with an upward joint, and the welding position is at the top of the pipe body. It is fixed and cannot be adjusted. After the tube body is formed, it is easy to form a peach-shaped tip. Invention content: [0003] The technical problem to be solved by the present invention is to provide a kind of pipe body forming joint vertically downwards, the internal welding is welded on the horizontal position, the deformation amount of the pipe body can be adjusted when the pipe body is formed, and there is no peach-shaped tip and straight line after the pipe body is formed. A unit for producing medium-diameter straight seam double-sided submerged arc welded steel pipes and a steel pipe for...

AI Technical Summary

Problems solved by technology

[0002] The existing medium-diameter straight seam steel pipe ERW high-frequency electric resistance welded steel pipe body is formed with an upward joint, and the welding position is at the top of the pipe body. Fixed, cannot be adjusted, easy to form a peach-shaped tip after the tube is formed

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