Device and process for pulse-current-assisted online induction heating of steel rail

Abstract

The invention discloses a device and a process for pulse-current-assisted online induction heating of a steel rail. According to the process, a pulse-current-assisted online induction heating method is applied to remove residual stress of the steel rail; an induction coil is located on the tread surface and the side surface of a railhead of the steel rail, so that the induction heating area of therailhead of the steel rail can be increased, the flux density per unit area of the railhead can be increased, and the heating efficiency of the railhead of the steel rail per unit time is improved; during induction heating, the temperature of the tread surface of the railhead is higher than the temperature of the side surface of the railhead; the distance between a pulse current applying mechanism and the steel rail is adjusted through a lifting mechanism, the distance between two graphite rods is adjusted, and the graphite rods are abutted against the steel rail; an auxiliary pulse current is applied to the railhead, so that most of the pulse current can be concentrated on the side face of the railhead, and a reinforcement layer of the railhead is specifically improved. By the device forpulse-current-assisted online induction heating of the steel rail provided by the invention, the quality requirements for and the production efficiency in heat treatment of the steel rail are improved, and the environmental pollution caused by heat treatment of the steel rail is avoided at the same time.

Description

technical field [0001] The invention relates to the technical field of rail heat treatment, in particular to a pulse current assisted on-line induction heating device and process for rails. Background technique [0002] Steel rails are the main components of railway tracks. Its function is to guide the wheels of the rolling stock, withstand the enormous pressure of the wheels, and transmit them to the sleepers. The rail must provide a continuous, smooth and least resistance rolling surface for the wheels. In the electrified railway or automatic blocking section, the rail can also be used as a track circuit. [0003] With the continuous development of railway tracks, the demand for steel rails is increasing. Due to the different environments in different time zones, the rails are constantly subjected to the combined effects of temperature load, humidity load, axial load and bending stress, which cause different damage forms in different time zones. Therefore, more stringen...

AI Technical Summary

Problems solved by technology

The heat treatment effect of modern rail production enterprises is poor, and the heating is uneven, which leads to uneven internal stress on the rail, and the heating efficiency is not high, the heat loss is large, and the environment is polluted, which cannot meet the large demand for high-quality rails in the Chinese market. Therefore, efficient and clean Mass production of high-quality rails is necessary

[0004] The Chinese patent with the notification number 207210863U discloses a rail longitudinal heating inductor, including a manifold, a water-cooled tube and an induction coil, which can improve the thermal efficiency of the induction heating of the rail head tread surface per unit time, and improve the slow heating of the rail head tread surface and the temperature. Low phenomenon, but this device can not guarantee the uniformity of quenching hardness and depth of hardened layer, and cannot produce high-quality products

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