CN2147706Y

CN2147706Y - Steel track medium frequency induction heating device

Info

Publication number: CN2147706Y
Application number: CN 92221986
Authority: CN
Inventors: 郑体成
Original assignee: CHONGQING IRON STEEL DESIGN
Current assignee: CHONGQING IRON STEEL DESIGN
Priority date: 1992-12-30
Filing date: 1992-12-30
Publication date: 1993-11-24
Anticipated expiration: 2002-12-30

Abstract

The utility model relates to an intermediate frequency induction heating device for heat treatment for steel rails, which is composed of hollow copper coils and a magnetic conductor, wherein the coils are distributed at the two sides and the top face of a rail head. Every group of coils is respectively formed into a magnetic loop, and seven magnetic loops are formed in the device. The coils are preferably embedded in the groove of the magnetic conductor. Because of the reasonable arrangement of the coils, the temperature distribution of the heating points of the rail head is improved. The temperature difference of the upper circular bead and the lower circular bead of the rail head is reduced. The performance after heat treatment keeps coincident. The utility model is suitable for heat treatment for steel rails of various types and various materials. The utility model is mainly used for hardening at the end of the rail and can also be used for heat treatment for steel rails in other occasions.

Description

Steel track medium frequency induction heating device

The utility model belongs to rail heat treatment technics field, in particular for the intermediate frequency electrical induction device of rail.

For adapting to the surge of passenger-cargo freight volume, railway interests constantly take heavy duty, at a high speed, high density, large conveying quantity measure, cause the impact badly broken of end of rail because of wheel and gap place.All adopt the heat treated way of portion of rail end office (EO) to improve its intensity and toughness both at home and abroad.According to railway interests's instructions for use, need zone of heating to be " hat ", and require the temperature difference of zone of heating as far as possible little, even with performance after guaranteeing heat treatment.In the prior art, reasonable heater should belong to " five loops " intermediate frequency electrical induction device, but it still exists rail head Shang Yuanjiao and following garden angle surface temperature to differ big (25～40 ℃) and making than shortcomings such as complexity.This will directly influence the performance after the rail heat treatment.

The purpose of this utility model provides a kind of energy and reduces " hat " zone of heating temperature difference and the simple intermediate frequency electrical induction of equipment making device.

For achieving the above object, (1000～2500Hz) electrical induction devices, it is made up of each the two groups of coil that is in the rail head both sides and three groups of coils being in the rail head tread to have designed the intermediate frequency in a kind of " seven loops ".Coil is that the copper pipe of hollow is made, and its section is square or rectangle.Each is organized in the groove that coil preferably is embedded in magnetic conductor.Each is organized coil and is connected outside magnetic conductor, and its order of connection will guarantee to make the two adjacent groups the direction of the winding current opposite, and its magnetic line of force is strengthened mutually.The end of incoming cables of coil and leading-out terminal and intermediate frequency power supply join.Pass to coolant in the coil, do not burnt out with the protection coil.After above-mentioned coil is given electricity, each coil produces a magnetic field separately, form seven flux loop altogether, so claim in " seven loops ", " seven loops " compared (seeing Fig. 1 and 2) as can be seen with " five loops ", and to " five loops " structure, tread is only arranged 1 group of coil, in order to look after temperature homogeneity, have to place the coil of tread and place the upper coil of rail head both sides do broad.So, can make 1. that the coil specification increases (wanting three kinds), 2. the coil on tread top is because broad causes the wiring difficulty.In addition, the end of incoming cables of coil and leading-out terminal are in the two ends of coil respectively, are connected very inconvenient with intermediate frequency power supply.To " seven loops " structure, tread is arranged three groups of coils, and the magnetic line of force of these three groups of coils is topped with tread substantially, and coil that will the rail head both sides makes special requirement, just can accomplish that the zone of heating temperature is even substantially.The coil of tread and side all is same specification, gives to make to bring convenience with being connected, and end of incoming cables and leading-out terminal all are in the same termination of coil simultaneously, make with intermediate frequency power supply easy to connect.In a word, concerning " seven loops ",, improved rail head Temperature Distribution everywhere because the increase of coil number and the reasonable disposition of coil more become rationally so that the magnetic line of force distributes, make the temperature difference at fillet and following fillet place be reduced to 5～15 ℃, make the performance basically identical behind the end hardening.

The user also can be by needing only coil, and the scheme implementation of magnetic conductor is not that heats has the scheme of magnetic conductor poor slightly than above-mentioned.

This device can be heated to 850～1020 ℃ with the firing rate of 12～50 ℃/C with rail head of rail.It has each position of rail head and has a narrow range of temperature, " hat " zone of heating shape symmetry, characteristics such as device is made simple, and is easy to connect.Its heats is compared as follows with " five loops ":

The heats comparison sheet

Sequence number	The induction heating equipment pattern	Last radiused surface temperature (℃)	Following radiused surface temperature (℃)	Temperature difference (℃)
					1	The application " seven loops " type	970	960	10
2	Original " five loops " type	975	940	35

This device is applicable to the rail of various models of heating and various materials, is mainly used in rail-head quenching, also can be used for the rail heat treatment of other occasions.

Below in conjunction with accompanying drawing preferred embodiment of the utility model is described further.

Fig. 1 " five loops " type heater profile.

Fig. 2 " seven loops " type heater profile.

In Fig. 2, the both sides of rail head of rail 1 are arranged two groups of coils 2 respectively, and the top of rail head 1 (tread) arranges three groups of coils 4, and above-mentioned coil preferably is embedded in the groove of magnetic conductor 3.Behind the coil electricity, form magnetic loop respectively around each group coil, its magnetic line of force distributes shown in fine rule among the figure.The sense of current of two adjacent groups coil is opposite, so that its magnetic line of force is strengthened mutually.

Claims

1, a kind of heat treated intermediate frequency electrical induction of rail device that is used for, it is characterized in that: arrange two groups of coils (2) respectively in the both sides of rail head (1), three groups of coils of top layout (4) at rail head (1), coil (2) and coil (4) are all made by hollow copper pipe, preferably above-mentioned coil are embedded in the groove of magnetic conductor (3).

2, device according to claim 1 is characterized in that, the order of connection of each coil will make the current opposite in direction of two adjacent groups coil, so that its magnetic line of force is strengthened mutually.