Steel rail welding joint heat treatment device and heater thereof

Abstract

The invention provides a heater for a steel rail welding joint heat treatment device, comprising a plurality of fire holes. The heater surrounds the steel rail welding joint and carries out the heat treatment for the steel rail welding joint by using the gas through the fire holes. The heater is made from the metal which has the thermal conductivity coefficient of not less than 350 W / m.k and the radiating surface area of not less than 240,000 mm2. The invention also discloses the steel rail welding joint heat treatment device which comprises a support structure, the heater and a sliding mechanism, wherein the support structure is fixedly arranged relative to a steel rail, the sliding mechanism is provided with a first end and a second end and is supported on the support structure to slide on the extension direction of the steel rail, and the heater is arranged on the sliding mechanism.

Description

technical field [0001] The invention relates to a device for heat-treating rail welded joints after rail welding (such as flash welding, gas pressure welding, thermite welding and narrow gap arc welding) in the railway or urban rail transit industry, and is especially suitable for use in rail laying sites Apparatus for heat treatment of welded joints of rails. The invention also relates to the heater of the device. Background technique [0002] In the railway or urban mass transit industry, rails need to be welded for seamless track construction. In the prior art, welding for rails generally includes flash welding, gas pressure welding, and thermite welding. The heat treatment of rail welded joints can significantly improve the mechanical properties of welded joints. Taking flash welding and gas pressure welding as examples, the elongation and impact absorption energy of joints can be increased by 50% to 100% through heat treatment, thereby greatly improving the service l...

AI Technical Summary

Problems solved by technology

Moreover, the inventors have not found research and improvements aimed at minimizing or eliminating water-cooled structures for heaters

Since the heat treatment device and its heater of the above-mentioned patent also need to be used for gas pressure welding of rail joints, it is necessary to provide a higher temperature than that required for post-weld heat treatment alone, so it is necessary to use a high combustion value but a low ignition point. The unstable nature of acetylene as a fuel gas increases the difficulty of minimizing or eliminating water-cooled structures

In addition, because the existing heat treatment device includes welding equipment and has a water-cooled structure, the existing heat treatment device is relatively heavy (for example, the heat treatment device that can automatically place the fire weighs about 200kg)

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