KR20090015584A - Scale draining apparatus in the soaking part of heating furnace - Google Patents

Scale draining apparatus in the soaking part of heating furnace Download PDF

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Publication number
KR20090015584A
KR20090015584A KR1020070080021A KR20070080021A KR20090015584A KR 20090015584 A KR20090015584 A KR 20090015584A KR 1020070080021 A KR1020070080021 A KR 1020070080021A KR 20070080021 A KR20070080021 A KR 20070080021A KR 20090015584 A KR20090015584 A KR 20090015584A
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KR
South Korea
Prior art keywords
scale
opening
heating furnace
furnace
discharge port
Prior art date
Application number
KR1020070080021A
Other languages
Korean (ko)
Inventor
김영복
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR1020070080021A priority Critical patent/KR20090015584A/en
Publication of KR20090015584A publication Critical patent/KR20090015584A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/39—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/04—Ram or pusher apparatus

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)

Abstract

A scale guidance apparatus in a soaking zone of a furnace is provided to prevent badness of a slab which is scratched with piled and fused oxidation scales by discharging the oxidized scales periodically generated in the soaking zone of the furnace. A scale guidance apparatus in a soaking zone of a furnace includes the followings: a scale vent(110) opened up to the soaking zone(3) of the furnace(1); a fixing guide on the lower part of the bottom surface in which the scale vent is formed; an opening and shutting door(130) moving through a guide and opening and closing the scale vent; an opening and shutting cylinder(140) connected with the door to move the door; and a scale receiving tray(150) installed on the immediately lower part of the scale bent.

Description

Scale Induction Device for Heating Furnace Crack {SCALE DRAINING APPARATUS IN THE SOAKING PART OF HEATING FURNACE}

The present invention relates to a scale induction apparatus for a crack in a furnace, and more particularly, it is possible to more easily induce and discharge scales accumulated on both sides of the crack in a pusher type heating furnace of a hot rolled and thick plate factory. The present invention relates to an apparatus for inducing scales in an improved heating furnace to minimize scratches.

In general, a pusher type heating furnace is used in a hot rolled or thick plate mill.

This pusher heating furnace is a device that preheats the slab in advance to a suitable temperature for rolling before rolling the slab, and pushes the pusher from one side of the heating furnace in a state in which a plurality of slabs are sequentially arranged to cause the slabs to be installed inside the heating furnace. To be transported on skid pipes.

For example, as illustrated in FIGS. 1 and 2, the heating furnace 1 is cracked while maintaining the constant temperature in the cracking zone 3 after the slab 2, which is a material in the heating zone and the heating zone, which is not shown, is heated. Extracted by the extractor 4 is transferred to a rolling mill (not shown).

In this case, a plurality of skid pipes (not shown) are installed inside the heating furnace 1, and the slab 2 is moved while being pushed by the pressing action of the charging pusher 5 by riding the skid pipes.

By the way, the lower edge of the cracks (3) is built around the electric pole, so that the partial wear caused by friction when the slab (2) is moved and the wear is accumulated on both sides of the cracks (3) as well as the heating furnace (1) Oxide scale 6 generated by oxidizing the surface of the slab 2 while passing through is also removed and accumulated together and aggregated and fused to the worn portion of the electric pole.

When the slab 2 is moved in this state, the lower surface of the slab 2, which is moved by the hardened oxidation scale 6, generates a deep scratchable scratch 7, which causes a defect.

The slab 2 shown in the circle of FIG. 1 is inverted to better show this scratch 7.

Therefore, the scratches 7 thus generated appear as band-shaped scab grooves in the width direction during the rolling process, resulting in enormous quality degradation.

In order to solve this problem, conventionally, the heating furnace 1 is stopped at an interval of 8 hours, and then, using a means such as a long pipe, the oxidation scale 6 generated inside the heating furnace 1, in particular in the cracking zone 3 is removed. It is being removed.

However, even in this case, due to the high heat inside the furnace 1, only the oxidation scale 6 near the extraction port could be removed, and the deep oxidation scale 6 was difficult to remove. Due to the high temperature inside the heating furnace 1, the operator is likely to be burned due to the high temperature in the furnace 1, resulting in low work efficiency, and the fused scale 6 cannot be easily removed. There was no.

The present invention has been made in view of the above-mentioned problems in the prior art, and solved this problem. The scales fused or stacked on both sides of the heating zone crack zone and on both sides are discharged immediately so that they are not fused and do not accumulate. The main problem is to provide a scale guide device for the cracking of the furnace to prevent scratches on the lower surface of the lower surface, as well as to prevent the scab groove defect in the widthwise band shape after rolling.

The present invention is a means for achieving the above-described problems, the scale discharge port formed by drilling downwards on the bottom surface of both sides of the cracks of the heating furnace; A guide fixed to the bottom surface of the bottom on which the scale discharge port is formed; An opening / closing door that opens and closes the scale outlet while moving along the guide; An opening / closing cylinder connected to advance the opening / closing door; Provided is a scale induction apparatus for a cracking furnace of the heating furnace, characterized in that consisting of a scale holder provided directly below the scale discharge port.

At this time, the scale discharge port is characterized in that the periphery thereof is inclined with the inclined surface toward the scale discharge port.

In addition, the heating furnace wall around the scale discharge port is characterized in that a plurality of pushing holes are further formed.

In addition, the upper surface of the opening and closing door is characterized in that the refractory is further attached.

Furthermore, a diaphragm is connected to a lower surface of the opening / closing door, and the diaphragm is also fitted to the guide under an intervening spring.

The present invention by periodically exhausting and removing the oxidized scale generated in the cracking zone of the heating furnace does not cause scratches scratched by the oxidized scale of the slab accumulated and fused to make a high-quality thick plate product after rolling, descaling For this reason, there is no need for the worker to do manual work, thus reducing the work efficiency, manpower, and preventing safety accidents.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a partially cutaway perspective view of the heating furnace showing the installation state of the scale induction apparatus according to the present invention, Figure 4 is a schematic longitudinal cross-sectional view showing an installation state of the scale induction apparatus according to the present invention, Figure 5 Partial cross-sectional view of a heating furnace showing a state of use of the scale induction device according to Figure 6 is an exploded perspective view of the scale induction device according to the present invention.

3 to 6, the scale induction apparatus according to the present invention is installed on both sides of the cracks 3 in the heating furnace (1).

That is, since the slab 2 is smaller than the width of the cracks 3, the spaces on both sides of the cracks 3 become empty when flowing by the pressure pusher 5, so that the oxide scale 6 is accumulated thereon.

Therefore, the scale induction apparatus of the present invention is installed in a place where the oxidizing scale 6 is concentrated, and when the oxidizing scale 6 is generated, it is configured to induce it and discharge it to the lower portion thereof.

To this end, as shown in FIGS. 5 and 6, the scale discharge ports 110 formed on the inclined surfaces 100 are formed at portions of both sides of the cracks 3.

In addition, a pair of guides 120 as shown in FIGS. 3 and 6 are fixed to the bolt 122 on the bottom surface of the crack zone 3 in which the scale discharge port 110 is formed.

In addition, the opening and closing door 130 is inserted into the guide 120, the refractory 132 is attached to the upper surface of the opening and closing door 130 is preferably to withstand high heat.

In addition, the cylinder rod 142 is connected to one side of the opening and closing door 130, the cylinder rod 142 is connected to the opening and closing cylinder 140, the opening and closing according to the forward and backward operation of the opening and closing cylinder 140 The door 130 is opened and closed in the guide 120 to open and close the scale outlet 110.

In addition, the scale is directly below or below the scale discharge port 110, that is, directly below the opening / closing door 130 so as to accommodate the oxidized scale 6 discharged through the scale discharge port 110. The receiving table 150 is disposed.

On the other hand, both side walls of the heating furnace (1) in which the cracks (3) are provided, a plurality of pusher holes 160 are formed around the scale discharge port (110).

The pusher hole 160 is a means for pushing the scale 6 into the scale outlet 110 into which the push rod of a pipe shape (not shown) is inserted and scattered during the initial discharge of the oxide scale 6.

In addition, the diaphragm 170 may be padded on the bottom surface of the opening / closing door 130, and a plurality of protrusions 172 may protrude from the bottom surface of the diaphragm 170, and the protrusion 172 may be formed on the bottom surface of the diaphragm 170. Each of the plurality of springs 180 is inserted into the guide 120 in this state, so that the spring 180 is not separated by the protrusion 172 during the forward / backward operation of the opening / closing door 130. As the reciprocating motion is carried on 120, the vibration plate 170 is vibrated, and the vibration may be transmitted to the opening / closing door 130 to smoothly discharge the oxide scale 6.

The operation relationship of the present invention having such a configuration is as follows.

Cracking zone 3 immediately before the extraction spout as the oxide scale 6 generated by contact with oxygen is pressed when heating and cracking the hot-rolled or thick slab 2 for rolling through the furnace 1 facility. On both sides of the stack.

When the oxide scale 6 is accumulated to some extent, the operator first moves the opening / closing cylinder 140 back and forth several times in a state in which the extraction operation of the slab 2 is stopped, thereby moving the opening / closing door 130 around the scale outlet 110. Oxidation scale (6) fused to all to remove the scale to the storage rack 150.

Subsequently, when the opening / closing door 130 is opened, the oxidation scales 6 accumulated around the upper portion or the scale discharge port 110 are discharged through the scale discharge port 110.

Prior to this process, it may be more preferable to insert the push pipe through the push hole 160 in advance, and then push the surrounding oxidation scales 6 around the scale discharge port 110, and the same operation after the discharge of the scale oxide 6 is also performed. It will be desirable to minimize the residual oxidizing scale 6 by performing.

In addition, the operation of discharging the oxidized scale 6 may be performed periodically by setting a time or periodically according to the number of input slabs 2.

In addition, when the diaphragm 170 is added during the opening / closing operation of the scale discharge port 110 of the opening / closing door 130, the operation of discharging the oxide scale 6 may be performed more smoothly.

In this way, when the scale discharge operation is completed, the opening and closing door 130 is closed and subsequently the slab 2 extraction operation is continuously processed.

As a result, the oxide scales 6 accumulated on the cracks 3 can be easily discharged in advance before being fused and fixed, so that scratches due to the accumulated scales can be prevented in advance.

1 and 2 are exemplary situation diagrams showing an oxide scale accumulation state in a furnace crack according to the prior art,

3 is a partially cutaway perspective view of a heating furnace showing an installation state of a scale induction apparatus according to the present invention;

Figure 4 is a schematic longitudinal cross-sectional view showing a state of installation of the scale induction apparatus according to the present invention,

5 is a partial cross-sectional view of a heating furnace showing a state of use of the scale induction apparatus according to the present invention,

6 is an exploded perspective view of the scale induction device according to the present invention.

♧ description of the symbols for the main parts of the drawing ♧

100 .... Slope 110 .... Scale outlet

120 .... Guide 130 .... Door Opening Door

140 .... opening / closing cylinder 150 .... scale cabinet

160 .... slip hole 170 .... vibration plate

180 ... spring

Claims (5)

A scale outlet formed by drilling downwards on both bottom surfaces of the cracking zone of the heating furnace; A guide fixed to the bottom surface of the bottom on which the scale discharge port is formed; An opening / closing door that opens and closes the scale outlet while moving along the guide; An opening / closing cylinder connected to advance the opening / closing door; Scale induction apparatus of the furnace crack stage characterized in that consisting of a scale holder provided directly below the scale discharge port. The method according to claim 1; The scale discharge port is a scale induction apparatus of the furnace crack characterized in that the periphery is formed with an inclined surface toward the scale discharge port. The method according to claim 1 or 2; A scale induction apparatus of a heating furnace crack stage, characterized in that a plurality of pushing holes are further formed in the heating furnace wall around the scale discharge port. The method according to claim 1; Scale induction apparatus of the furnace crack characterized in that the refractory is further attached to the upper surface of the opening and closing door. The method according to claim 1, or 2 or 4; A diaphragm is connected to a lower surface of the opening / closing door, and the diaphragm is inserted into the guide under a spring.
KR1020070080021A 2007-08-09 2007-08-09 Scale draining apparatus in the soaking part of heating furnace KR20090015584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070080021A KR20090015584A (en) 2007-08-09 2007-08-09 Scale draining apparatus in the soaking part of heating furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070080021A KR20090015584A (en) 2007-08-09 2007-08-09 Scale draining apparatus in the soaking part of heating furnace

Publications (1)

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KR20090015584A true KR20090015584A (en) 2009-02-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101277543B1 (en) * 2011-07-28 2013-06-21 현대제철 주식회사 Furnace for rolling mill
KR101417516B1 (en) * 2012-12-26 2014-07-08 주식회사 포스코 Scale removing apparatus of furnace
KR101424712B1 (en) * 2013-05-29 2014-08-04 현대제철 주식회사 Apparatus for treating scale

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101277543B1 (en) * 2011-07-28 2013-06-21 현대제철 주식회사 Furnace for rolling mill
KR101417516B1 (en) * 2012-12-26 2014-07-08 주식회사 포스코 Scale removing apparatus of furnace
KR101424712B1 (en) * 2013-05-29 2014-08-04 현대제철 주식회사 Apparatus for treating scale

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