Heating device and method for large-diameter thick-wall pipe

Abstract

The invention provides a heating device for a large-diameter thick-wall pipe. The heating device comprises an induction coil, magnetizers, an infrared temperature measuring instrument and a liquid pressure controller. The appearance of the induction coil is of a spiral structure formed through winding of a rectangular hollow copper pipe. The two ends of the induction coil are provided with a waterinlet and outlet port and a wiring board correspondingly. The appearance of each magnetizer is of a saddle-shaped hollow structure. The inner surface of each magnetizer groove wraps the induction coil. A water inlet and a water outlet are formed in the two sides of the outer surface of each magnetizer correspondingly, wherein the water inlet is connected with the liquid pressure controller. A support is connected with the infrared temperature measuring instrument. A neutral layer is a face P when a target pipe blank is bent, the induction coil is divided into a small-turn-number end and a large-turn-number end through the face P, and the small-turn-number end and the large-turn-number end are located on the bent inner side and the bent outer side of the target pipe blank correspondingly.The character that the magnetism conduction capability of the magnetizers changes along with the temperature is utilized, through the symmetrically-arranged magnetizers, temperature field distributionafter pipe blank heating is optimized, and the quality after pipe blank 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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