JPS5842435Y2 - Local instantaneous continuous heating device for steel billets - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for instantaneous continuous heating of a steel billet local area, and more particularly to a heating device that continuously heats a low temperature local portion of a steel billet in a conveyance line that conveys the steel billet to a rolling mill.

The end surface of a steel billet, particularly a bar, a wire rod, etc., that is transported to a rolling mill is cooled during transport, and a good rolling condition is often not obtained at this end.

For this reason, the ends of the steel billet need to be cropped not only due to shape issues but also due to their quality, and the yield decreases as the low-temperature portion increases.

Furthermore, if the end of the steel piece is extremely cooled, the end will no longer be caught in the rolling rolls, resulting in a so-called blowing phenomenon.

Furthermore, if the intermediate portion of the steel billet is cooled for some reason, the rolling condition of that portion will deteriorate.

Conventionally, there was no means to eliminate such variations in rolling conditions.

It is an object of the present invention to provide a heating device that continuously heats a low-temperature local part of a steel billet so as to maintain a good rolling state of the steel billet conveyed to the rolling mill of this invention.

The device for locally instantaneous continuous heating of steel slabs according to this invention includes a thermometer for measuring the surface temperature of the steel slabs on the conveyance line that conveys the steel slabs to the rolling mill, and a thermometer that measures the surface temperature of the steel slabs at a position closer to the rolling mill than the thermometer. An induction coil is installed to heat the steel billet, and a speedometer is installed to detect the conveyance speed of the conveyor line.When the thermometer detects a low-temperature local area of the steel billet, the controller activates a high-frequency generator, and the speedometer also activates the high-frequency generator. Based on the measured values, a delay timer calculates the point in time when the low-temperature local area reaches the vicinity of the induction coil, and the induction coil is excited by a high-frequency generator at that point.

Next, an embodiment of the instantaneous continuous heating device for a steel billet localized according to this invention will be described with reference to the drawings.

In FIG. 1, a radiation thermometer 3 for measuring the surface temperature T of the steel slab 1 is installed above a conveyance line 2 that conveys the steel slab 1 to a rolling mill (not shown), and a conveyance roller of the conveyance line 2 4 is connected to a speed meter 5 that measures the conveyance speed (2) using a pulse generator (not shown).

Furthermore, an induction coil 6 is installed in the conveyance line 2 at a position closer to the rolling mill than the thermometer 3, and can locally and instantaneously heat the surface of the steel billet 1 during conveyance.

An oscillator 7 and a controller 8 are sequentially connected to the thermometer 3, while a delay timer 9 and a high frequency generator 10 are sequentially connected to the induction coil 6.

Further, the controller 8 is connected to a high frequency generator 10, and the speedometer 5
is connected to the delay timer 9.

Here, the oscillator 7 has a constant set temperature T.

An output signal S1 is sent to the controller 8 when the surface temperature T is lower than
Based on the output signal S1, the controller 8 excites the induction coil 6 at a preset heating time t and frequency f.

The timing of this excitation should be determined by the conveyance speed ■, and the delay timer 9 is set so that the excitation is performed when the low temperature local area detected by the thermometer 3 reaches the vicinity of the induction coil 6. Then, after an appropriate delay time td from low temperature local detection etc., power from the generator 10 is supplied to the induction coil 6.

Further, the heating depth D is determined by the frequency f,
Good heating conditions can be obtained by setting the frequency f in consideration of the steel type, working environment, etc.

Here, the generator 10 is driven by a power supply device 11, and cooling water W is supplied to the induction coil 6 from a cooling water pipe 12 to prevent its performance from deteriorating.

In this embodiment, the delay timer 9 is interposed between the induction coil 6 and the generator 10, but as in the modification shown in FIG.
A delay timer 9 may be interposed between the controller 8 and the speedometer 5.

Here, the reference numeral 13 in FIG. 2 indicates a setting board, but the other reference numerals are the same as in FIG. 1.

As mentioned above, the instant continuous continuous heating device for a steel billet according to this invention is equipped with a thermometer for measuring the surface temperature of the steel billet on the conveyance line that conveys the billet to the rolling mill, and a thermometer located closer to the rolling mill than the thermometer. It is equipped with an induction coil that heats the billet at the appropriate time, and a speedometer that detects the conveyance speed of the conveyor line.When a low-temperature local area of the billet is detected by the thermometer, a high-frequency generator is activated by the controller. Based on the measured value of the speedometer, a delay timer assumes the point at which the low-temperature local area reaches the vicinity of the induction coil, and at that point the induction coil is excited by a high-frequency electric machine, making it possible to continuously heat the low-temperature local area of the steel billet. This has the excellent effect of maintaining a good rolling condition throughout.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the instantaneous continuous heating device for a steel piece according to this invention, and FIG. 2 is a block diagram showing a modified example. In the drawings, the same or corresponding parts are designated by the same reference numerals. 1... Steel billet, 2... Conveyance line, 3.
... Radiation thermometer, 4 ... Conveyance roller, 5
...Speedometer, 6...Induction coil, 7.
...Oscillator, 8...Controller, 9...
...Delay timer, 10...High frequency generator, 11
...Power supply device, 12...Cooling water piping,
13... Setting board, D... Heating depth, f
...Frequency, Sl...Output signal, t.
...Heating time, t, ...Delay time, T,
...Set temperature, T...Surface temperature,■.
...Conveyance speed, W...Cooling water.

Claims (1)

[Scope of utility model registration request] The scraping line that transports the steel billet to the rolling mill is equipped with a thermometer that measures the surface temperature of the steel billet, an induction coil that heats the billet at a timely position closer to the rolling mill than the thermometer, and the conveyance speed of the conveyor line. A speedometer that detects the temperature is installed, a high-frequency generator that excites the induction coil is connected to the induction coil, and the high-frequency generator is activated when the measured value of the thermometer is below a set value. A controller and a delay timer that calculates the delay time until a local part of the steel piece whose temperature has been measured reaches the vicinity of the induction coil from the measured value of the speedometer and sets the excitation timing of the induction coil are connected. Single local instantaneous continuous heating device.