Intermediate frequency heating system

Abstract

The invention relates to a heating system, in particular to an intermediate frequency heating system, which mainly comprises an intermediate frequency power controller, an induction heating ring and a water cooling system, wherein the intermediate frequency power controller is connected with the induction heating ring; the water cooling system is connected with the induction heating ring; the intermediate frequency power controller adopts a serial resonant inverting circuit; and an electronic device IGBT is composed of a converting full bridge, and is matched with a power regulating circuit, a protection circuit and a display circuit. The intermediate frequency heating system takes the IGBT as a main converting element, has the characteristics of high heating efficiency, uniform heating, simple operation, controllable temperature, convenient movement and the like, and particularly solves the problem of bending a steel pipe with the major diameter phi of 1,016*18mm made of X70 pipeline steel in a bridge rib steel pipe process.

Description

technical field [0001] The invention relates to a heating system, in particular to a medium frequency induction heating system. Background technique [0002] The arch rib steel pipe material of CFST arch bridge is currently designed at home and abroad with Q345 low-alloy structural steel, and there is no report on the use of X70 pipeline steel. X70 pipeline steel is a high-grade low-alloy steel produced for the West-East Gas Pipeline with reference to the American "API Spec SL" standard. 630MPa, the tensile strength is ≥570MPa. The corners of X70 pipeline steel below 20 degrees are bent by cold bending machine at the manufacturing site, and the large-angle bends are bent by X70 UOE straight seam pipes in the factory, and the bending axis is arc-shaped . [0003] At present, there are only a few manufacturers of intermediate frequency pipe bending machines in China. Recently, Liaoning Pipe Fittings Research Institute successfully designed and manufactured DN2000×150×9000mm...

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Problems solved by technology

[0003] At present, there are only a few manufacturers of intermediate frequency pipe bending machines in China. Recently, Liaoning Pipe Fittings Research Institute successfully designed and manufactured DN2000×150×9000mm large-diameter intermediate frequency pipe bending machines in a certain unit in Daqing City, and successfully made Φ1016×18mm pipe bends by hot-simmering. The bending radius is 4D, and the ratio of wall thickness to diameter is more than 1:100. This equipment and related technologies fill the international and domestic gaps. Radius catenary type and other curved pipes cannot be applied to the bending of arch rib steel pipes of arch bridges in bridge engineering

[0004] Most of the bridge engineering adopts the flame heating pipe bending process scheme, but there are many defects in the pyrotechnic pipe bending technology, mainly manifested in slow heating speed, uneven heating, high gas consumption cost, and poor working environment

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