A vertical jacking press device and method for correcting convex deformation of steel pipe weld seam

Abstract

The invention provides a vertical jacking press device and a method for correcting outer convex deformation of a steel pipe welding line. The device comprises a left side vertical support frame; the bottom end of the left side vertical support frame is fixedly mounted on a bottom support frame; a top support frame is horizontally mounted at the top of the left side vertical support frame; an upper convex mold is mounted on the lower end surface of the top support frame, and is matched with a lower convex mold to form a correction jacking mechanism; the lower convex mold is mounted on the upper end surface of a support plate; the support plate is fixedly mounted and supported at the tops of piston rods of two jacking hydraulic cylinders; and the jacking hydraulic cylinders are mounted on the bottom support frame. The device mainly aims to improve the manufacturing quality of medium and small steel pipes, eliminate the residual welding stress and guarantee the ovality of the steel pipes to accord with the code requirement so as to reduce the misalignment phenomenon of pipe orifices in assembly and butt joint of the steel pipes, so that the energy loss of gas or liquid mediums operating in the steel pipes is reduced.

Description

technical field [0001] The invention relates to a hydraulic jacking press device for correcting the convex deformation of the longitudinal seam of a small pressure steel pipe. It is mainly used to correct the convex deformation after the longitudinal seam welding of the single-section steel pipe of the small pressure steel pipe of the hydropower station. The invention belongs to a new device in the field of welding deformation correction of metal structural parts. Background technique [0002] Pressure pipelines are used more and more commonly as liquid and gaseous medium transport carriers. The steel pipes used in front of power station units with small installed capacity, urban water supply pipes, petrochemical gas (oil) pipelines with relatively low pressure, etc., are often made of Q235 or Q345 grade steel, and the wall thickness of the steel pipe is between Within 8-30mm, the diameter of the steel pipe is mostly 1.5m-4m. In view of the manufacturing situation of this...

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Problems solved by technology

In view of the manufacturing situation of this kind of steel pipe at the project site, the batch is large. In order to reduce the project cost, it is often the case to build a steel pipe factory on the construction site. Large presses with seam deformation are rare because of the high cost of press equipment and relatively large foundations

[0003] The key point of the present invention is to proceed from reality. Generally, this type of steel pipe has only one longitudinal seam, and when welding, considering the cost, it is often to open a single-sided groove. The submerged arc automatic welding method is used, and the convenience of the welding position is often used to open an inner slope. If the welding line energy and welding level are not well controlled during the welding process, the welding deformation of the longitudinal seam will be caused. If the longitudinal seam is concave and deformed, it can be forcibly corrected by the on-site plate rolling machine, but the convex weld seam is in There is no good solution on site. If thermal correction is used, not only the cost is high and the efficiency is low, but also the technical proficiency of the operator is required to be high.

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