An integrated coreless bent pipe apparatus

Abstract

The invention provides an integrated coreless bent pipe apparatus belonging to the field of pipeline machining. The integrated coreless bent pipe apparatus comprises a medium frequency heating device which comprises an induction heating ring and an outer cooling ring which are mounted together through welding. The inside of the outer cooling ring is provided with an annular water passage and the inner peripheral surface of the outer cooling ring is provided with a plurality of water holes communicating with the cooling water passage; the center of the medium frequency heating device is provided with a cooling water pipe matching the same; one end of the cooling water pipe is provided with an inner cooling ring corresponding to the outer cooling ring; the outer periphery of the inner cooling ring is provided with a plurality of water holes communicating with the cooling water pipe. The side of the medium frequency heating device is provided with a clamp which can rotate freely. The installing cost is reduced; inner cooling and outer cooling are combined to guarantee the quality of bent pipe manufacture. The device is applicable to the manufacture of bent pipes.

Description

Technical field [0001] The invention relates to a pipeline processing equipment, in particular to a pipe bending machine. Background technique [0002] The elbow is one of the important components of oil and gas pipelines, and long-distance pipelines require a large number of elbows. The elbow is also one of the structural parts with harsher load in the pipeline. Among the pipelines that have been built and operated, pipeline failure accidents related to bends account for a high proportion of the entire pipeline accidents. The overall quality of the bends is one of the bottlenecks that restrict the safe and stable operation of the pipeline. [0003] Induction heating tube bending production technology fully borrows induction heating, which has the characteristics of rapid heating, narrow heating band and fast cooling. Compared with other methods, induction heating tube bending has many advantages such as small ellipticity, minimum wall thickness reduction and convenient bending ra...

AI Technical Summary

Problems solved by technology

[0004] Its shortcoming is that in the process of rotating and deforming the tube blank heated by the induction heating ring around the main shaft, the heated tube blank cannot be cooled in time, and the stress distribution in the bending process is uneven, so that the uniformity of the tube cannot be guaranteed. Bending, once a large bending deformation occurs locally, the strength of this position will drop rapidly, resulting in local collapse and deformation of this position during the bending process, which will seriously affect the qualification rate of the pipe fittings

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