A strip continuous casting and rolling induction heating device

Abstract

The invention discloses a continuous casting and rolling induction heating device for plate strips. The continuous casting and rolling induction heating device comprises a plurality of induction heaters which are arranged at intervals of transfer rollers side by side, wherein each induction heater comprises two pairs of plane inductors which are arranged side by side along the width directions of the plate strips; each pair of plane inductors comprises a lower-layer plane inductor and an upper-layer plane inductor; each lower-layer plane inductor is arranged corresponding to the upper-layer plane inductor; the plate strips can pass the part between the upper-layer plane inductors and the lower-layer plane inductors through the transfer rollers; each plane inductor comprises a plane core; a plurality of tooth parts are arranged on the plane core along the movement direction of a plate at intervals; a tooth groove is formed between two adjacent tooth parts; and a coil is wound on the tooth parts of the cores. According to the device, online fast induction heating of the plate strips of different specifications can be achieved on the condition that the front-end plate strips are not over-burnt; the impact on the plane inductors due to plate strip deformation and warpage can be prevented; the security and the reliability of equipment are improved; and the stability of the production rhythm is ensured.

Description

technical field [0001] The invention belongs to the technical field of strip continuous casting and rolling heating, and in particular relates to a strip continuous casting and rolling induction heating device, which is especially suitable for on-line continuous induction heating of thin steel plates. Background technique [0002] With the advancement of science and technology, it has become the goal pursued by people to realize the production of steel plates with special properties such as high-strength steel with excellent weldability, steel for high-rise buildings and steel for large ships by using continuous casting and rolling technology. However, rolling the continuous casting slab into strips of different shapes and specifications requires reheating the continuous casting slab to continue processing and rolling. Moreover, fast online heating of the strip has an important influence on the material structure transformation of the strip, and is crucial to the final perfo...

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the online induction heating of industrialized strips, there are three problems in the current induction heating device: (1) The same inductor cannot be flexibly adjusted according to the thickness and width of the strip to obtain high heating efficiency and uniform temperature distribution

Such as Japanese patents JP2004074277A, JP2002226912A, JP2003082412A and Chinese patent CN200810196998, the induction heating equipment using spiral coils, because the space distance inside the coil cannot be adjusted, it is not suitable for heating strips with different plate widths and plate thicknesses

(2) There is a problem of over-burning at the end of the heated strip. Although the inductor with the heating device is designed with a transverse magnetic field, the coil spacing can be adjusted according to the thickness of the steel plate and the sudden production situation, but there is a heating start stage. The induction current gathers in the strip near the front and rear ends of the inductor and causes the problem of overheating of the temperature there

For example, patents US6498328B2 and US5739506 use a transverse magnetic field to heat a single strip. Although the coil spacing is adjustable, there is a problem that the induced current gathers near the front end of the strip and causes the temperature there to overheat.

Chinese patent CN105698525A hopes to solve the problem of overburning near the front end of the strip through the space distance occupied by different front and rear coil copper tubes in the same inductor, but it ignores the most basic principle: the magnetic field lines excited by the inductor are from the iron core exude from within

Changing the distance between the copper tubes before and after the coil cannot solve the problem of over-burning at the front end of the strip

(3) The safety and stability of the equipment needs to be improved

During the continuous rolling production process, the generated iron oxide scales are accumulated on the steel plate, coupled with the warping and deformation of the end of the strip, it is easy to jam or collide with the sensor when the strip passes through the sensor, resulting in equipment damage or performance failure. Unstable, which affects the rhythm of the entire production line

Patent CN105648203A considers adjusting the position of the upper sensor according to the thickness of the strip, but there are no specific implementation details, nor does it consider the heating conditions of different strip widths

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