Heating device and heating method for large-diameter thick-walled pipe

Abstract

The invention provides a heating device for a large-diameter thick-walled pipe, which comprises an induction coil, a magnetic conductor, an infrared thermometer and a liquid pressure controller. The shape of the induction coil is a spiral structure wound by a rectangular hollow copper tube. The two ends of the induction coil are respectively provided with a water inlet and outlet and a wiring board. The shape of the magnetic conductor is a saddle-shaped hollow structure. On the induction coil, a water inlet and a water outlet are respectively provided on both sides of the outer surface of the magnet, the water inlet is connected with the liquid pressure controller, and the bracket is connected with the infrared thermometer. The neutral layer of the target tube blank during bending is the plane P, and the plane P divides the induction coil into a small-turn end and a multi-turn end, and the small-turn end and the multi-turn end are located on the inside and outside of the target tube blank bending, respectively. . The invention utilizes the characteristic that the magnetic permeability of the magnet conducting body changes with temperature, and through the symmetrically arranged magnet conducting bodies, the temperature field distribution of the tube blank after heating is optimized, and the quality of the tube blank after bending is effectively improved.

Description

technical field [0001] The invention relates to the field of pipe bending processing, in particular to a heating device and a heating method for large-diameter thick-walled pipes. Background technique [0002] The bending processing of pipes occupies an important position in industrial sectors such as metal structure, engineering machinery, petrochemical industry, light industry, etc. Among them, large-diameter thick-walled pipes are widely used in gas and liquid transportation networks. The intermediate frequency induction local heating pipe bending process is the most advanced process method in the large diameter thick wall pipe bending processing. The intermediate frequency induction heating equipment is used to locally heat the tube blank to the required temperature, and then the heated part is bent to obtain the target Bend fittings. [0003] Precise control of the heating temperature during the tube blank forming is one of the research focuses of the intermediate freq...

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Problems solved by technology

[0004] The Chinese patent with the publication number CN106140907A discloses a double-temperature simmering method for high-grade steel induction heating elbows. This method adjusts the local gap of the induction coil and places the weld seam of the steel pipe at the position after the gap is adjusted, so as to achieve the steel pipe in the During the heating process, the temperature of the weld position is different from that of other positions to achieve double-temperature simmering. However, this method does not consider the difference in the circumferential deformation of the steel pipe during the bending process. Except for the weld position, the others are all heated to the same temperature. The quality problem of the tube billet after bending caused by the difference in deformation is still difficult to be effectively solved

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