JPH1135130A - High temperature continuous heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a sheet slab (50 to 150 mm thick) to be heated or heat- retained while it is continuously conveyed to the speed of a continuous casting device or a rolling mill, to be conveyed in the longitudinal direction, and to be heated up to high temperatures (for example, 1260 deg.C or more) suited to rolling. SOLUTION: Two sets of moving beams 12, 13 extending horizontally are provided in a heating furnace 11. The respective moving beams repeat the following actions: rise → advance → fall →retract, and during advancing of one moving beam, the other moving beam is adapted to fall → retract → retract. Thus, a slab 1 in the heating furnace is alternately supported by the two sets of moving beams 12, 14 to be continuously advanced at about the same height.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-temperature continuous heating furnace for continuously transporting a slab while heating it at a high temperature.

[0002]

2. Description of the Related Art As a heating furnace for continuously transporting a slab while heating it, a roller hearth furnace is conventionally used. As shown schematically in FIG. 4, the roller hearth furnace includes a driving roll 3 in a horizontal heating furnace 2, and the rotation of the driving roll 3 heats the slab 1 while moving the slab 1 horizontally. ing. In this roller hearth furnace, the feed speed can be freely adjusted by adjusting the rotation speed of the drive roll 3. For example, the roller hearth furnace is connected to a continuous casting machine or a rolling mill, and the slab 1 is connected to a continuous casting machine or a rolling mill. Heating or warming can be performed while continuously transporting according to the speed.

However, such a roller hearth furnace has a problem that the temperature inside the furnace is limited because the driving roll 3 is exposed to a high temperature. That is, although the drive roll itself is water-cooled, the temperature inside the furnace is limited to a maximum of about 1150 ° C. even in this case.
There is a problem in that the material is severely damaged, the life is extremely shortened, and if the material is changed to a material having a high heat-resistant temperature, it becomes very expensive.

On the other hand, a walking beam furnace schematically shown in FIG. 5 is known as a heating furnace for heating a slab while transporting it. The furnace comprises a moving beam 4 extending substantially horizontally in a heating furnace 2 and a fixed support 5 for supporting the slab 1.
The slab 1 is alternately supported by the moving beam 4 and the fixed support member 5 and intermittently moved forward by repeating the rising, moving forward, falling, and retreating the moving beam 4. Note that a cam, a wedge, and the like are used to move the moving beam 4 up and down, and a driving cylinder and the like are used to move forward and backward. Such a walking beam furnace is disclosed in, for example, JP-A-4-235815.
No. (driving method of a walking beam type transport device) and the like.

Since the walking beam furnace has no mechanical part in the heating furnace 2, the slab can be transferred while being heated at a high temperature of 1150 ° C. or more (for example, about 1300 ° C.). However, since the movement of the slab in the walking beam furnace is intermittent in principle, the slab 1 is connected to a continuous casting machine or a rolling mill like a roller hearth furnace, and the slab 1 is moved at the speed of the continuous casting machine or the rolling mill. It was not possible to heat or keep the temperature while continuously transporting according to the temperature. Therefore, conventionally, the walking beam furnace heats or keeps heat mainly by intermittently moving the thick slab in the width direction.

[0006]

SUMMARY OF THE INVENTION A continuous heating furnace is linearly connected between a continuous casting machine and a rolling mill, and a thin slab (for example, a thickness of 50 to 150 mm) manufactured by the continuous casting machine is continuously used in the continuous heating furnace. By keeping the temperature or heating while transporting it in accordance with the speed of the casting apparatus, and further heating it to a high temperature suitable for rolling and supplying it in accordance with the rolling speed of the rolling mill, compact rolling equipment can be configured.

[0007] In order to realize the rolling equipment of such a new concept, it is possible to heat or keep the temperature while continuously transporting according to the speed of a continuous casting apparatus or a rolling mill, and to obtain a thin slab (thickness of 50 to 150 mm). At a high temperature (for example, 1260 ° C.) suitable for rolling.
A continuous heating furnace that can heat up to the above is indispensable.

However, in a conventional roller hearth furnace,
However, if the maximum operating temperature is low, trying to meet the requirements will result in severe roll damage and extremely short life, as described above, and if the material is changed to a material with a high heat-resistant temperature, it will be extremely expensive. There was a problem. Also, in the conventional walking beam furnace, although the requirements of the reverse are satisfied, continuous transport is not possible because of intermittent movement in principle, and in the case of a thin slab, the tip of the thin slab hangs down. There was a problem that it was difficult to transport.

The present invention has been made in order to solve such a problem. That is, an object of the present invention is to be able to heat or keep heat while continuously transporting according to the speed of a continuous casting device or a rolling mill, to transport a thin slab (thickness 50 to 150 mm) in the length direction, Another object of the present invention is to provide a high-temperature continuous heating furnace capable of heating to a high temperature (for example, 1260 ° C. or higher) suitable for rolling.

[0010]

According to the present invention, there are provided two sets of moving beams extending horizontally in a heating furnace, and each moving beam repeats ascending → forward → decreasing → retreating, and While the moving beam is moving forward, the other moving beam descends → retreats → rises, so that two sets of moving beams support the slab in the heating furnace alternately and continuously at almost the same height. , A high-temperature continuous heating furnace is provided.

The structure of the present invention is the same as that of the conventional walking beam furnace except that it has two sets of moving beams.
The slab can be transported while being heated at the above high temperature (for example, about 1300 ° C.). In addition, two sets of moving beams are provided, and while one moving beam is moving forward, the other moving beam descends → retreats → rises, so the two sets of moving beams support the slab in the heating furnace alternately and are almost the same. It can be advanced continuously at height. Further, even in the case of a thin slab, the tip is always supported by two sets of moving beams, so that the tip does not hang down and can be transported stably in the length direction.

According to a preferred embodiment of the present invention, the moving speed of each moving beam is variable. This variable mechanism can be easily performed by adjusting the flow rate using, for example, a hydraulic cylinder, interlocking with the inlet or outlet table or the roller hearth furnace, continuously heating the slab, and increasing the heating temperature to 1150. ° C or higher (eg, about 1260 ° C).

A high-temperature continuous heating furnace on the upstream side having a forward speed equal to the feed rate of the slab from the continuous casting machine; and a high-temperature continuous heating furnace on the downstream side having a forward speed equal to the rolling speed on the downstream side. The upstream and downstream heating furnaces are connected to each other in the longitudinal direction of the slab. With this configuration, the slab supply speed on the furnace entrance side and the rolling speed on the furnace exit side are reduced by two.
The speed of each slab can be adjusted to each other, and a new concept of rolling equipment using thin slabs (t50 to 150) can be realized.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a rolling facility using the high-temperature continuous heating furnace of the present invention. The rolling equipment in this figure includes an upstream high-temperature continuous heating furnace 10 and a downstream high-temperature continuous heating furnace 10, and the upstream and downstream heating furnaces 10 are arranged so as to be connected in the longitudinal direction of the slab 1. I have.
The upstream high-temperature continuous heating furnace 10 has a forward speed equal to the slab supply speed V1 from a continuous casting machine (not shown) located on the left side in the figure. Similarly, the downstream high-temperature continuous heating furnace 10 has a rolling speed V
It has a forward speed equal to two.

As shown in FIG. 1, each high-temperature continuous heating furnace 10 according to the present invention includes two sets of moving beams 12 and 13 extending horizontally in a heating furnace 11, respectively. The heating furnace 11 heats the slab at a high temperature of 1150 ° C. or higher (for example, about 1300 ° C. at the maximum) because there is no mechanical part inside similarly to the conventional walking beam furnace.

FIG. 2 is a partial perspective view of the high-temperature continuous heating furnace of the present invention. As shown in FIG. 1 and FIG.
Reference numerals 2 and 13 each include a plurality of beams arranged at intervals in the width direction. In addition, each moving beam 12, 13
Has a wheel 14 at the lower end of a downwardly extending support member, which can be moved horizontally back and forth by a hydraulic cylinder 16 (FIG. 1) along a lifting rail 15 located below. Further, the lifting rail 15 moves up and down while maintaining the horizontal state by the parallel link mechanism 17, and moves up and down by another hydraulic cylinder 18 (FIG. 1). 1 and 2 show the wheels 14, the lifting rails 15, and the parallel link mechanism 17 for the moving beam 12, but similar mechanisms are separately provided for the moving beam 13 and are independent of each other. It can be operated. With this configuration, the moving beams 12 and 13 can independently repeat the ascending → forward → fall → retreat.

FIG. 3 is a diagram for explaining the operation of the high-temperature continuous heating furnace according to the present invention. As shown in FIG.
No. 3 repeats ascending → forward → fall → retreat, and one moving beam (eg, 12) moves forward while the other moving beam (eg, 13) descends → retreat → rises. That is, the hydraulic cylinders 16 and 18 for the moving beams 12 and 13 are controlled by a control device (not shown), and one of the moving beams 12 and 13 always advances while supporting the slab 1 while the other descends. → Retreat → Ascend to prepare for the next advance. The forward speed of each of the moving beams 12 and 13 can be freely adjusted by controlling the flow rate of the hydraulic cylinder 16.

The configuration of the present invention described above is the same as the conventional walking beam furnace except that two sets of moving beams 12 and 13 are provided. High temperature (for example, up to about 1300 ° C
(Before and after) the slab can be transported while being heated.
Also, two sets of moving beams 12 and 13 are provided, and one of the moving beams descends, retreats, and rises while the other is moving forward. Therefore, the slab in the heating furnace is alternately supported by the two sets of moving beams. However, it can be continuously advanced at substantially the same height. Furthermore, even in the case of thin slabs, the tip
Since it is always supported by the set of moving beams, the tip does not hang down and can be transported stably in the length direction.

Further, since the moving speed of each of the moving beams 12 and 13 is variable, the slab is continuously heated while being linked with the entrance and exit tables or the roller hearth furnace, and the heating temperature is set to 1150. ° C or higher (~ 1260 ° C).

The apparatus further comprises an upstream high-temperature continuous heating furnace having a forward speed equal to the slab supply speed from the continuous casting machine, and a downstream high-temperature continuous heating furnace having a forward speed equal to the downstream rolling speed. By arranging the upstream and downstream heating furnaces connected in the longitudinal direction of the slab, the speeds of the two slabs can be adjusted to the slab supply speed on the furnace entrance side and the rolling speed on the furnace exit side, respectively. Made, thin slab (t50
~ 150), a new concept of rolling equipment can be realized.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, in the examples of FIGS. 1 and 2, the driving unit using the link mechanism is shown, but other known driving units, for example, a cam, a wedge, or the like may be used.

[0022]

As described above, the high-temperature continuous heating furnace of the present invention can be heated or kept warm while being continuously conveyed in accordance with the speed of a continuous casting machine or a rolling mill, and can be used for thin slabs (thickness of 50). ~ 150mm) in the length direction.
In addition, it has excellent effects such as heating to a high temperature (for example, 1260 ° C. or higher) suitable for rolling.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a rolling facility using a high-temperature continuous heating furnace of the present invention.

FIG. 2 is a partial perspective view of the high-temperature continuous heating furnace of the present invention.

FIG. 3 is an operation explanatory view of the high-temperature continuous heating furnace of the present invention.

FIG. 4 is a schematic view of a conventional roller hearth furnace.

FIG. 5 is a schematic view of a conventional walking beam furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slab 2 Heating furnace 3 Drive roll 4 Moving beam 5 Fixed support material 6 Rolling equipment 10 High-temperature continuous heating furnace 12, 13 Moving beam 14 Wheel 15 Lifting rail 16 Hydraulic cylinder 17 Parallel link mechanism 18 Hydraulic cylinder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Homochi Uniform 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima Harima Heavy Industries, Ltd. Yokohama Engineering Center

Claims (3)

[Claims] 1. A heating furnace comprising two sets of moving beams extending horizontally, wherein each of the moving beams repeats ascending → forward → down → retreat, and one moving beam moves while the other moves. Characterized in that the slab in the heating furnace is continuously advanced at almost the same height while alternately supporting the slab in the heating furnace with two sets of moving beams. Continuous heating furnace. 2. The high-temperature continuous heating furnace according to claim 1, wherein the moving speed of each of the moving beams is variable. 3. An upstream high temperature continuous heating furnace having a forward speed equal to the slab feed rate from the continuous casting machine, and a downstream high temperature continuous heating furnace having a forward speed equal to the downstream rolling speed, The high-temperature continuous heating furnace according to claim 1, wherein the upstream and downstream heating furnaces are connected to each other in a longitudinal direction of the slab.