JPH04559Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention uses a billet heater that transfers a metal billet and heats it by induction using the electromagnetic induction effect of a heating coil. This relates to improvements that can be made to prevent this.

[Prior art and its problems]

When attempting to continuously detect the temperature of a billet in a non-contact manner using a billet heater that performs induction heating by the electromagnetic induction effect of a heating coil wrapped around the outer periphery of a cylindrical refractory lining through which the metal billet is transferred, generally A large gap was provided between the conductors of the heating coil, and a through hole was made in the lining at this location, and a radial surface temperature color-based detection device was used to detect the temperature through the hole. Since it is necessary to install it away from the coil, it becomes difficult to measure the temperature if the optical axis shifts due to vibrations, etc., and the billet is easily oxidized due to the through holes in the lining.

[Purpose of invention]

The object of this invention is to provide a billet heater capable of continuously detecting the temperature of the billet without contact and preventing oxidation, in order to eliminate the above-mentioned drawbacks.

[Key points of the idea]

In order to achieve the above-mentioned purpose, this device penetrates the refractory lining through the gap between the conductors of the induction heating coil and inserts a cylindrical sleeve into which a fiberscope of a photoelectric temperature measuring device is inserted, and the temperature of the billet is measured as described above. In addition to detecting this with a device, an inert gas is sent into the lining through the sleeve.

[Example of idea]

The figure shows an embodiment of this invention, in which an induction heating coil 2 is wound around the outer periphery of a cylindrical refractory lining 1.
is fixedly supported. A skid rail 4 is provided inside the lining 1, and this rail 4
A large number of metal billets 5 are transported by a conveying device (not shown) above.
While continuously transferring the water, it is heated by the electromagnetic induction action of the heating coil 2 until it reaches a required high temperature. The heating coil 2 has a hollow rectangular cross section and is designed to be cooled by passing cooling water through the hollow part, and the outer periphery of the conductor is insulated with an electrical insulator. This heating coil 2 has a small gap between some conductors, and a cylindrical sleeve 6 is inserted and fixed through the lining 1 through this gap. This sleeve 6 is for inserting the fiber scope 8 of the photoelectric temperature measuring device 7, and is made of a non-magnetic metal or an insulating material to prevent the generation of noise due to the electromagnetic induction effect of the heating coil 2. The temperature measurement device 7 includes a fiberscope 8, a light emitting device 9, a detection device 10, and a control device 1.
The surface temperature of the billet 5 can be continuously detected without contact. The sleeve 6 is designed to allow inert gas to be fed into the lining 1 through a gap with the fiberscope 8.

According to the embodiment, by feeding an inert gas into the lining 1, it is possible to not only prevent the oxidation of the billet 5 and the accompanying generation of scale, but also to cool the fiberscope 8.
It is also possible to prevent interference with the temperature measurement field of view due to combustion gas such as oil adhering to the billet 5 and temperature measurement errors due to changes in the emissivity of the surface of the billet 5 due to oxidized scale.

[Effect of idea]

According to this invention, in a billet heater, a cylindrical sleeve into which a fiberscope of a photoelectric thermometer is inserted is inserted through the refractory lining through the gap between the conductors of the induction heating coil, and an inert gas is introduced into the lining through this sleeve. Since the billet is fed in, the temperature of the billet heated while being transferred within the lining can be detected continuously and accurately by the detection device without contact, and oxidation can be prevented.

[Brief explanation of drawings]

The figure is a longitudinal cross-sectional view of a main part of an embodiment of this invention. 1... Lining, 2... Heating coil, 5...
Billet, 6... Sleeve, 7... Temperature measuring device, 8
...Fiber scope.

Claims (1)

[Scope of utility model registration request] In a billet heater that performs induction heating using a heating coil wrapped around the outer periphery of a cylindrical refractory lining through which a metal billet is transferred, a fiberscope of a photoelectric thermometer is passed through the lining through the gap between the conductors of the heating coil. A billet heater, characterized in that a cylindrical sleeve is inserted into the billet, the temperature of the billet is detected by the temperature measuring device, and an inert gas is sent into the lining through the sleeve.