JPH0459919A - Pusher type heating furnace - Google Patents

Abstract

PURPOSE:To make opening part of an ejecting hole small and to reduce motive power needed to carry-out of a steel billet by making the ejecting hole of one end to furnace width direction and arranging an ejecting furnace hearth part formed with a downward slope toward this ejecting hole in furnace hearth end part of the ejecting side. CONSTITUTION:The heated steel billet 1 is continuously pushed toward the front face from a charging hole in a heating furnace 6 through upper faces of furnace hearth rails 4 laid on skid pipes 3, upper faces of hot skids 5 and hearth surface in the furnace hearth 12, and reaches sloped plate 7 and naturally dropped on the ejecting furnace hearth part 9. The sloped plate 7 is arranged to boundary with the ejecting furnace hearth part 9 formed with the downward slope toward the ejecting hole 8, and as the slope is gradually made to gentle so that the sloping face at the ejecting hole side is lengthened, shock at the time of dropping is relieved. In the ejecting furnace hearth part 9, an ejecting bar 13 reciprocated to the furnace width direction along the slope is waited and the steel billet 2 dropped on the ejecting furnace hearth part 9 is carried to out of the furnace with the ejecting bar 13 and conveyed with rollers 10. An ejecting door 11 is lifted only at shifting the ejecting bar 13 and the opening part of heating furnace 6 at the time of carrying out the steel billet 2 is made to small.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pusher-type heating furnace that carries out steel slabs in the width direction of the heating furnace.

[Conventional technology]

A billet delivery section of a conventional pusher type heating furnace will be explained with reference to the drawings.

FIG. 2 shows a partial projection view of the pusher type force n heat furnace extraction side of the front extraction method. It is continuously pushed out from the charging port of the heating furnace 6 toward the extraction port 8 on the floor 120, slides down from the extraction port 8 on the sloped plate 7 toward the roller 10, and exits the furnace. It will be carried out. The discharged steel piece 2 is conveyed by rollers]O. When carrying out the steel slabs 2, the extraction door I] was opened over the entire length in the width direction of the furnace.

[Problem to be solved by the invention]

However, in the conventional pusher type heating furnace with front extraction method, it is necessary to provide an extraction port along the entire length of the furnace in the width direction. Quality problems such as decarburization of the steel billet, local cooling of the steel billet due to intrusion of outside air, and occurrence of defects during rolling due to unstable combustion occurred.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pusher type heating furnace that allows the opening of the heating furnace to be made small when carrying out steel billets.

[Means to solve the problem]

The present invention provides a pusher-type heating furnace having a mechanism for moving materials in the furnace using a pusher. It is equipped with an extraction hearth section with a Since the steel pieces are carried out in the axial direction by the downward slope of the extraction hearth, the extraction port opening can be made smaller and the power required for carrying out the steel pieces can be reduced.

Further, the extraction hearth part has an inclined plate at the boundary with the hearth,
It is preferable that the inclined plate is long on the extraction port side.

When a piece of steel falls into the extraction hearth, the inclined plate allows it to gradually slide down from the extraction port side, thereby reducing the impact of the fall.

Further, it is preferable that the extraction hearth section is provided with a steel billet extraction device having a pull-out rod that is movable back and forth in the width direction of the furnace. The steel pieces that have fallen onto the extraction hearth are stopped by a pull-out rod that is placed on standby in advance, and are accurately guided and carried out of the furnace, thereby extending the life of the furnace wall.

Further, the extraction hearth section may be provided with a roll-gang device in which rollers are disposed in the extraction hearth section and driven using a drive source from outside the furnace. The steel pieces that have fallen onto the cola can be carried out of the furnace without the need for a separate extraction device.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partial projection view of the extraction side of the pusher type heating furnace according to the present invention, in which the heated rope piece 1 is placed on the top surface of the hearth rail 4 placed on the skid pipe 3, the top surface of the hot skid 5, and the top surface of the hot skid 5. , are continuously pushed out from the charging port of the heating furnace 6 toward the front on the floor surface of the hearth 12, and when they reach the inclined plate 7, fall naturally onto the extraction hearth portion 9. The inclined plate 7 is
It is provided at the boundary with the extraction hearth part 9 that slopes downward toward the extraction port 8, and the slope gradually becomes gentler so that the oblique side on the extraction port side becomes longer, which reduces the impact when dropped. It has a structure. A pull-out rod 13 that can reciprocate in the width direction of the furnace along the slope is waiting in the extraction hearth part 9, and the rope piece 2 that has fallen onto the extraction hearth part 9 is pulled out of the furnace by the pull-out rod 13. It is carried out by rollers 10. Since the extraction door 11 is raised only when the extraction rod 13 is moved, it is possible to make the opening of the heating furnace 6 smaller when the steel pieces 2 are taken out.

The following table shows a comparison of the extraction port opening size and 0.2% between the embodiment of the present invention and the conventional pusher-type heating furnace of the front extraction method shown in FIG.

As can be seen from Table 1, it is clear that the power U heat furnace of the present invention has a 0.2% lower value than the conventional example.

In addition, since the opening of the extraction port is small, fluctuations in the pressure inside the furnace due to opening and closing of the extraction door are extremely small, combustion is stable, and the amount of outside air intrusion is kept to a minimum, reducing the occurrence of defects during billet rolling. It is possible to exhibit effects such as reducing

〔Effect of the invention〕

According to the present invention, by reducing the opening of the extraction port, it is possible to significantly reduce the fluctuation in furnace pressure at the billet discharge section by 7JX, which provides advantages such as keeping furnace O2% and furnace temperature changes low. It can be effective.

[Brief Description of the Drawings] Fig. 1 is a partial projection view of the extraction side of a pusher-type heating furnace showing an embodiment of the present invention, and Fig. 2 is a partial projection view of the extraction side of a pusher-type heating furnace with a front extraction method showing a conventional technique. FIG. 1.2: Steel piece, 3 varnished pipe, 4: Hearth rail,
5: Hot skid, 6: Heating furnace, 7: Inclined plate, 8: Extraction port, 9: Extraction hearth, 10: Loaf): Extraction door 13: Pull-out rod, 12: Hearth

Claims (1)

[Scope of Claims] 1. In a pusher type heating furnace having a mechanism for moving materials in the furnace using a pusher, there is provided a heating furnace at the end of the hearth on the extraction side, with one end in the width direction of the furnace serving as an extraction port, and a device extending toward the extraction port. A pusher type heating furnace characterized by having an extraction hearth section with a downward slope. 2. The pusher type heating furnace according to claim 1, further comprising an inclined plate at the boundary between the extraction hearth portion and the hearth, and the inclined plate is longer on the extraction port side. 3. The pusher type heating furnace according to claim 1, wherein the extraction hearth is provided with a steel billet extraction device having a pull-out rod that is movable back and forth in the width direction of the furnace. 4. The pusher-type heating furnace according to claim 1, further comprising a roller gang device which disposes rollers in the extraction hearth and drives them from outside the furnace using a drive source.