Method for realizing accurate welding between pipeline and flanges

Abstract

The invention discloses a method for realizing accurate welding between a pipeline and flanges. The method comprises the following steps that accurate matching and calibration between flange screw hole alignment frustums and flange screw hole calibration tapered holes are achieved, so that flange screw holes in the two flange plates on one pipeline are accurately aligned; then the pipeline is placed between two flange clamping devices, a transmission screw rod is controlled to rotate by rotating a hand wheel disc, and then a right welding vertical frame is driven to move towards a left welding vertical frame on a welding table so as to press the pipeline; then an air cylinder and a telescopic arm are controlled to retract, and then a driving motor and a welding gun are sequentially started for welding; and welding is completed, the pipeline is disassembled, and then next welding is carried out. According to the method, the flange screw holes of the two flange plates welded on one pipeline are automatically aligned one by one, precise welding of the pipeline and the flanges can be guaranteed, and the method can be used in industries needing high requirements for pipeline connection and sealing strength, such as nuclear power, chemical engineering or construction.

Description

technical field [0001] The invention relates to the technical field of sewage treatment equipment pipeline connection, harmful gas treatment equipment pipeline connection and oil pipeline processing and installation equipment, and in particular to a method for realizing precise welding of pipelines and flanges. Background technique [0002] Common transportation pipelines are usually spliced ​​by a large number of pipelines. Both ends of each pipeline are welded with flanges. Each pipeline is connected by flanges. The flange connection is convenient, firm and tight. It is widely used in the connection of pipelines. [0003] In the prior art, there are many equipments and technologies for welding flanges on pipes, and the degree of automation is quite high. For example, the technical scheme with the patent number 201410267726.1 can realize automatic installation and automatic welding. [0004] However, there are still many technical problems that are difficult to solve in th...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for realizing precise welding of pipes and flanges, which solves the problem of directly pressing both ends to make the flange surface and the end surface of the pipe flush. This welding structure is prone to welding failures If the flange is set on the pipe, there will inevitably be a gap between the inner hole of the flange and the outer wall of the pipe. If the flange is only stored through the top pressure, it will not be possible to make the flange and the pipe weld Keep the concentric axis, and it is also difficult to ensure that the side of the flange is perpendicular to the axis of the pipe. If the flange is inclined, there will inevitably be a gap when the pipes at both ends are docked, leaving a safety hazard; and each pipe The two flanges are connected by flanges, and the two flanges are connected by bolts. In standardized products, if the screw holes of the two flanges on each pipe are not aligned one by one, then when the two pipes are connected, there will inevitably be The screw holes on the connecting flanges of the two pieces do not correspond, and the bolts cannot be inserted

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