Portable rail welding joint medium-to-high-frequency electric induction heating normalizing device and method

A technology of welding joints and induction heating, which is applied in the direction of track, track laying, track maintenance, etc., can solve the problems affecting the quality of normalizing, joint quality, heating temperature that is difficult to control, and cannot be eliminated in time, so as to achieve controllable heat-affected area, The effect of short temperature rise time and simple structure

Active Publication Date: 2012-06-20
CHINA RAILWAY SHANGHAI ENGINEERING BUREAU GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the remaining gas in the bottle is lower than a certain pressure, it cannot be used continuously, causing serious waste and increasing the cost
In the open-air construction, the heating temperature is difficult to control due to the influence of wind, etc., and it is uneven, which affects the quality of normalizing and joint quality; construction in the subway tunnel, due to the narrow space of the tunnel and insufficient air circulation, the construction is not only unsafe but also the exhaust gas cannot be discharged in time. Good for operator health

Method used

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  • Portable rail welding joint medium-to-high-frequency electric induction heating normalizing device and method
  • Portable rail welding joint medium-to-high-frequency electric induction heating normalizing device and method
  • Portable rail welding joint medium-to-high-frequency electric induction heating normalizing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] like image 3 As shown, after the on-site rail welding is completed, the normalizing heating equipment is placed at the rail welding joint. After the normalizing equipment simulates the operation and checks that it is normal, the rail joint is supported and cushioned to keep the rail in the design line shape, and then the induction soft coil is installed. At the joint position, turn on the frequency conversion oscillating power supply, conduct medium and high frequency induction heating for 6 to 8 minutes, measure the temperature of the rail surface with an infrared probe, and when the temperature of the heated rail reaches 800°C to 950°C, the temperature control device will control the switch to automatically disconnect Heat the power supply, then remove the induction soft coil, and use air cooling to cool down the normalized rail joint.

[0046] Place the normalizing heating equipment at the rail welding joint: the equipment is placed near the welding joint, and its d...

Embodiment 2

[0057] Welded joints are normalized (with air cooling). Use ZH-2 / 160KW fixed induction normalizing equipment to normalize the joints. When the temperature of the welded joint is lower than 500°C, the fixed induction normalizing equipment will normalize the joint and heat the rail weld to 900°C (±10°C). After heating to the specified temperature, cool with 0.13-0.15Mpa oil-free pressure air for 2 minutes. Improve the mechanical properties of the weld. Rail temperature control is measured by GD photoelectric thermometer (400°C-900°C). Through normalizing, the grains are refined; through rapid cooling, the mechanical performance indicators such as the hardness of the joint are improved.

Embodiment 3

[0059] Welded joints are normalized (natural cooling). The joints are normalized with oxy-acetylene flame normalizing equipment. When the temperature of the welded joint is lower than 500°C, the oxy-acetylene mixture combustion heating device is used to heat the rail weld to 900°C (±10°C). After heating to the specified temperature, it is naturally cooled to improve the mechanical properties of the weld. Rail temperature control is measured by GD photoelectric thermometer (400°C-900°C). Through normalizing, the grains are refined; through rapid cooling, the mechanical performance indicators such as the hardness of the joint are improved. .

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Abstract

The invention relates to the technical field of rail spot welding normalizing heating construction, in particular to a portable rail welding joint medium-to-high-frequency electric induction heating normalizing device and a method. A coil is arranged on the periphery of a workpiece of a rail to be treated, medium-to-high-frequency current is applied into the coil, the metal atoms of the workpiece within the range of the coil are enabled to do turbulent motion by using the electromagnetic induction principle of the coil, the motion enables the atoms to rub mutually to generate heat, the temperature of the workpiece is increased, power is cut off when regulated normalizing temperature is reached, the structural grains of the workpiece are refined at the temperature, the effect of improving the internal structure is reached and the goal of improving the internal quality of the structure is achieved. The joint is evenly heated from the inside to the outside, the time is short and the heat affected zone is controllable; the equipment is small and ingenious and is flexible to operate; the structure is simple and the device is convenient to disassemble and assemble; the device is not restricted by the rail type of the workpiece, the length and the construction environment; and the device is safe, healthful and pollution-free.

Description

[technical field] [0001] The invention relates to the technical field of rail rail contact welding normalizing heating construction, in particular to a portable high-frequency electric induction heating normalizing device and method for rail welding joints. [Background technique] [0002] With the continuous development of urban construction, rail transit, as a low-carbon, environmentally friendly, convenient, stable, large-capacity, and low-cost means of transportation, is more and more favored by large and medium-sized city builders and welcomed by ordinary people. A symbolic facility and a beautiful landscape for the development of a modern city and the improvement of people's living standards. The quality of the track in rail transit plays a key role. In order to make people ride more comfortably, and to reduce the connection wear and joint damage between rails and rails, joint welding becomes the main body of seamless rail joints. In the construction of rail joint weldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B31/18
Inventor 赵文君刘国利程向锋毕云泉范喜德张瑞兴张爱萍
Owner CHINA RAILWAY SHANGHAI ENGINEERING BUREAU GROUP CO LTD
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