KR20100021838A - Device and method for preventing material droop and lessening skid mark of walking beam type reheating furnace - Google Patents

Device and method for preventing material droop and lessening skid mark of walking beam type reheating furnace Download PDF

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Publication number
KR20100021838A
KR20100021838A KR1020080080470A KR20080080470A KR20100021838A KR 20100021838 A KR20100021838 A KR 20100021838A KR 1020080080470 A KR1020080080470 A KR 1020080080470A KR 20080080470 A KR20080080470 A KR 20080080470A KR 20100021838 A KR20100021838 A KR 20100021838A
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KR
South Korea
Prior art keywords
heating furnace
moving
furnace
information
beam type
Prior art date
Application number
KR1020080080470A
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Korean (ko)
Inventor
엄기선
Original Assignee
주식회사 포스코
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Priority to KR1020080080470A priority Critical patent/KR20100021838A/en
Publication of KR20100021838A publication Critical patent/KR20100021838A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/564—Tension control
    • 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
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids
    • 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
    • F27B2009/3083—Arrangements to handle skid marks

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

PURPOSE: An apparatus and a method are provided to prevent droop of a material and reduce skid marks in a walking beam heating furnace by repetitively raising and lowering a movable beam according to the specification of a material in an idling state of the walking beam heating furnace. CONSTITUTION: An apparatus for preventing droop of a material and reducing skid marks in a walking beam heating furnace comprises a server(100), two movable beams(300a,300b), a drive unit(400), and a controller(600). A material charged in the walking beam heating furnace is carried by a charge roller(700a), and a pusher(800) charges the material into the furnace body by the back-and-forth motion. The movable beams carry the material from the charge side to the exit side by ascending, moving forth, descending, and moving back in sequence. An exit roller(700b) carries the material to an exit extractor(900). Three stationary beams(200a,200b,200c) and the movable beams alternately contact the material in order to prevent skid marks. The drive unit includes motors(400a,400b) and pulse generators(500a,500b).

Description

Device and method for preventing material droop and lessening skid mark of walking beam type reheating furnace

An aspect of the present invention relates to a device and a method for preventing material droop and skid mark reduction in a working beam type heating furnace. In particular, a skid mark prevents material droop when the working beam type heater is idle for a certain time. It relates to an apparatus and a method for reducing the.

In general, the working beam type heating furnace has a moving time 100mm down from the hearth level during a certain time (for example, 10 minutes) at rest without discriminating steel grades to minimize material dislocation by skid marks. Repeat the 100mm rise and fall from the hearth level for a while. Hereinafter, the phenomenon thereof will be described in detail with reference to FIGS. 1 to 2B.

FIG. 1A is an operation state diagram when the moving beam is raised in the resting state of the conventional working beam heating furnace, and FIG. 1B is an operation state diagram when the moving beam is strong in the resting state of the conventional working beam heating furnace. 1A and 1B, in the case of a two-row slab heating furnace, three fixed beams 20a, 20b, and 20c and two moving beams 30a and 30b are constituted by one set.

In FIG. 1A, the moving beams 30a and 30b are raised 100 mm at the huss level to support the material 10. In FIG. 1B, the moving beams 30a and 30b are lowered by 100 mm at the hearth level and fixed beams ( 20a, 20b, and 20c support the material 10. In the process of raising and lowering the moving beams 30a and 30b, the distances of rising and falling are all 100 mm, and when the moving beams 30a and 30b are raised or lowered, respectively, the moving beams 30a and 30b and the fixed beams 20a and Skid marks are formed at portions where the material 10 is in contact with 20b and 20c.

FIG. 2A is a state diagram when the material is sag in the resting state of the conventional working beam heating furnace, and FIG. 2B is a state diagram when the material is sag in the resting state of the conventional working beam heating furnace.

As shown in FIG. 2A, when two moving beams 30a and 30b raise and hold the material 10 by 100 mm, the overrun state is maintained by 1500 mm or more. At this time, the fixed beams 20a, 20b, and 20c do not support the material.

In the case of the short material as shown in FIG. In particular, a material containing 0.7% or more of carbon is sag. At this time, extraction is impossible, and thus, idling or walking beam down cannot be performed. At this time, since the material 10 is a short material, only two fixed beams 20b and 20c support the material 10 and one fixed beam 20a does not support the material 10.

As such, the operation of repeatedly moving the material up and down at a distance of 100 mm by the moving beam uniformly does not take into account the characteristics of the material specifications, and the degree of deflection of the material if the material is raised and lowered according to the characteristics of the material specifications. Can be minimized and skid marks on the surface of the material can be minimized.

However, up to now, there is no way to raise and lower the material to the minimum according to the characteristics of the material specification.

An aspect of the present invention is an apparatus and method for reducing skid marks while preventing material deflection by repeatedly moving and moving the beam repeatedly according to characteristics of a material when the working beam type heating furnace is idle for a predetermined time. The purpose is to provide.

One aspect of the present invention, the server for receiving and storing the information of the material charged in the working beam type heating furnace; A moving beam which transfers the material to the heating furnace exit side while the heating furnace is in a normal operating state, and moves the material to the heating furnace exit side and lifts the material when the heating furnace is in the idle state; A driving unit for moving the moving beam at a vertical distance from the hearth level of the heating furnace; And a controller which receives the information of the material from the server and controls the driving unit to raise and lower the upper end of the moving beam by a predetermined distance from the hearth level of the heating furnace according to the information of the material. The present invention provides a device for preventing material droop and reducing skid marks in a working beam heater.

In one embodiment of the present invention, the information of the material is the content of the carbon component contained in the material or whether the deflection history in the heating furnace characterized in that the material sagging prevention and skid mark in the heating beam heating furnace Provide a device for abatement.

In another embodiment of the present invention, when the content of the carbon component contained in the material is 0.7% or more, or if there is a deflection history in the furnace, the upper end of the moving beam is 18 to 22mm from the hearth level of the furnace. The present invention provides a device for preventing sagging and reducing skid marks in a walking beam type heating furnace, characterized in that for repeating an operation of lifting the material while raising and lowering as much as possible.

Another aspect of the invention, the step of receiving and storing the information of the material charged in the working beam type furnace; When the heating furnace is in a normal operating state, the moving beam is moved up, forward, descending, backward while moving the material to the heating furnace exit, and repeating the operation of lifting the material when the heating furnace is in the idle state ; Moving the moving beam a vertical distance from the hearth level of the furnace; And acquiring the information of the material and controlling the upper end of the moving beam to rise and fall by a predetermined distance from the hearth level of the heating furnace according to the information of the material. To prevent sagging and reduce skid marks in the

According to an aspect of the present invention, when the working beam type heating furnace is idle for a certain time, the moving beam is repeatedly raised and lowered according to the characteristics of the material specifications to reduce the degree of deflection of the material to the minimum Skid marks on the surface of the car can be minimized.

According to another aspect of the present invention, in the case of excessive time and idle state, the rise and fall of the moving beam does not meet the characteristics of the specification of the material, the skid mark is enlarged, the rolling load is increased, or the shape of the material due to torsion or scratches, etc. This can be prevented from lasting.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

Figure 3 is a block diagram of a device for preventing the deflection of the material and the skid mark in the working beam type heating furnace of the present invention. As shown in FIG. 3, the apparatus for preventing material sagging and reducing skid marks in a working beam type heating furnace includes a server 100, moving beams 300a and 300b, a driving unit 400, and a controller 600. do.

When the material (not shown) charged in the working beam type furnace is transferred by the charging roller 700a, the pusher 800 moves forward and backward to charge the material into the furnace body. When the loading of the material is completed, the moving beams 300a and 300b sequentially move up, forward, down, and reverse to transfer the material on the charging side to the extraction side, and transfer the material by the extraction roller 700b to extract the extractor 900. Extract the material with). When the normal work is performed in this manner, the idling operation in which the moving beams 300a and 300b only move up and down is unnecessary, and the three fixed beams 200a, 200b and 200c and the two moving beams ( 300a, 300b) alternately come into contact with the raw material so that no skid marks are generated.

However, when the material on the extraction side is idle due to equipment troubles or the like, the material is placed on the fixed beams 200a, 200b, and 200c (the base position of the moving beam is the lowered position), and the three fixed beams 200a, 200b, Skid marks are concentrated in the contact area of 200c). In order to prevent this, a function called idling is used. The idling is an operation in which the moving beams 300a and 300b repeat only the rising and falling in the normal operation of the rising, moving forward, falling, and reversing. This is the same as normal operation by reducing the skid mark by changing the contact point of the material, which is an operation function that can be used when the material cannot be further moved due to abnormal post process.

The present invention does not uniformly use such an idling operation, but proposes a method of applying differently according to the characteristics of each material specification. In the following, the working beam type heating furnace can minimize the deflection of the material even in the idle state, and the device for reducing the skid mark to the minimum will be described.

The server 100 receives and stores the information of the material charged into the working beam type furnace. The information of the material is the content of the carbon component contained in the material or whether there is a sag history in the furnace. The operator can monitor the operating situation in the working beam heating furnace through the screen of the server 100, and can input and manage the information of various materials to the server 100.

The moving beams 300a and 300b differ in their operation when the heating furnace is in the normal operation state and when the heating state is the idle state. When the furnace is in a normal operating state, the moving beams 300a and 300b move the material upwards, forwards, descends and backwards to the exit of the furnace, and when the furnace is in the idle state, the movable beams 300a and 300b are moved. Repeat the operation of lifting the material. When the moving beams 300a and 300b are raised, the moving beams 300a and 300b support the material. When the moving beams 300a and 300b are lowered, the fixed beams 200a, 200b and 200c support the material. Doing.

The driving unit 400 moves the moving beams 300a and 300b at a vertical distance from the hearth level of the heating furnace (the height at which the upper ends of the fixed beams and the moving beams coincide), and the driving unit 400 is connected to the motors 400a and 400b. Pulse generators 500a and 500b. The motors 400a and 400b raise and lower the moving beams 300a and 300b by rotation, and the pulse generators 500a and 500b detect the rotational speed according to the rotation of the motors 700a and 700b to generate pulse signals. Let's do it.

The controller 600 receives the information of the location from the server 100 and controls the speeds of the motors 400a and 400b according to the location of the location. If the information of the material is information that the content of the carbon component contained in the material is greater than or equal to the predetermined content, or that the material has been sagging in the heating furnace, the controller 600 determines that the moving beams 300a and 300b are preset distances. The speed of the motors 400a and 400b is controlled to repeat rising and falling as much as possible. For example, if the content of carbon contained in the material is 0.7% or more, or if there is a deflection history in the furnace, the controller 600 raises the upper end of the moving beam by 18 to 22 mm from the hearth level of the furnace. And to repeat the operation of lifting the material while falling. Preferably, when the content of the carbon component contained in the material is 0.7% or more, the upper and lower ends of the moving beams 300a and 300b are repeatedly lifted and lowered by 20 mm from the hearth level of the heating furnace.

4A is an operating state diagram when the moving beam is raised in the resting state of the working beam heating furnace of the present invention, and FIG. 4B is an operating state diagram when the moving beam is lowered in the resting state of the working beam heating furnace of the present invention.

As shown in Figs. 4A and 4B, the positions where the moving beams 300a and 300b are raised and lowered when the moving beams 300a and 300b rise and fall from the hearth level of the working beam type heating furnace are 20 mm, respectively. That is, the moving beams 300a and 300b do not move the material 1000 on the charging side to the extraction side in the order of raising, moving forward, lowering, and reversing as in the prior art, but only 20 mm from the huss level while only raising and lowering by the idling operation. Ascending and descending 20mm will be repeated.

Compared to the operation of the conventional moving beams 300a and 300b in the idle state, the operation of the moving beams 300a and 300b of the present invention is 100 mm, which is a position where the conventional devices can rise and fall from the huss level to the maximum. 20mm that meets the characteristics of each standard. This is the position where the moving beams 300a and 300b are raised and lowered from the huss level when the content of the carbon component contained in the material 1000 is 0.7% or more, or when the material 1000 has a history of deflection in the furnace. to be.

The 20 mm set in the present invention is a height capable of minimizing the deflection of the material 1000. When the moving beams 300a and 300b are operated at such a height, the material 1000 is fixed to the fixed beam 200a, It is possible to minimize the temperature drop of the parts in contact with the 200b, 200c and the moving beams (300a, 300b).

Since the physical properties are different depending on the material 1000 and the degree of deformation is different, the rising and falling positions of the moving beams 300a and 300b from the hearth level of the heating furnace are determined and set differently according to the material properties of the material 1000. It can be seen that.

In addition, the rising and falling positions of the moving beams 300a and 300b may be changed depending on the working state in addition to the physical properties of the material 1000. For example, when the idle state is idle for 5 minutes or more, the moving beams 300a and 300b are used. ) 20mm from the hearth level, 20-40mm descent.

The present invention is not limited by the above-described embodiment and the accompanying drawings. It is intended that the scope of the invention be defined by the appended claims, and that various forms of substitution, modification, and alteration are possible without departing from the spirit of the invention as set forth in the claims. Will be self-explanatory.

1A is an operation state diagram when the moving beam is raised in the idle state of a conventional working beam type heating furnace.

1B is an operation state diagram when the moving beam is lowered in the idle state of a conventional working beam type heating furnace.

FIG. 2A is a state diagram when the aligning material sags in a state of rest of a conventional working beam type heating furnace. FIG.

2B is a state diagram when the short material sags in a state of rest of a conventional working beam type heating furnace.

Figure 3 is a block diagram of a device for preventing the deflection of the material and the skid mark in the working beam type heating furnace of the present invention.

4A is an operation state diagram when the moving beam is raised in the resting state of the working beam type heating furnace of the present invention.

Figure 4b is an operating state diagram when the moving beam is lowered in the resting state of the working beam type heating furnace of the present invention.

                 <Explanation of symbols for the main parts of the drawings>

100: server 200a, 200b, 200c: fixed beam

300a, 300b: moving beam 400: drive unit

400a, 400b: Motor 500a, 500b: Pulse Generator 600: Controller 700a: Charging Roller

700b: exit roller 800: pusher 900: extraction extractor

Claims (4)

A server which receives and stores information on the material charged in the working beam type heating furnace; A moving beam which transfers the material to the heating furnace exit side while the heating furnace is in a normal operating state, and moves the material to the heating furnace exit side and lifts the material when the heating furnace is in the idle state; A driving unit for moving the moving beam at a vertical distance from the hearth level of the heating furnace; And A controller which receives the information of the material from the server and controls the driving unit to raise and lower the upper end of the moving beam by a predetermined distance from the hearth level of the heating furnace according to the information of the material; Apparatus for preventing material sag and skid mark reduction in the walking beam type heating furnace comprising a. The method of claim 1, The information of the material is the content of the carbon component contained in the material or whether there is a history of deflection in the furnace, the apparatus for preventing material deflection and skid mark reduction in a working beam type furnace. The method of claim 2, When the content of carbon contained in the material is 0.7% or more, or when there is a deflection history in the heating furnace, the upper end of the moving beam is moved up and down by 18 to 22 mm from the hearth level of the heating furnace. Apparatus for preventing material drooping and reducing skid marks in a walking beam heater, characterized in that for repeating the lifting operation. Receiving and storing information on a material charged in a working beam type furnace; When the heating furnace is in a normal operating state, the moving beam is moved up, forward, descending, backward while moving the material to the heating furnace exit, and repeating the operation of lifting the material when the heating furnace is in the idle state ; Moving the moving beam a vertical distance from the hearth level of the furnace; And Acquiring the information of the material and controlling the upper end of the moving beam to rise and fall by a predetermined distance from the hearth level of the heating furnace according to the information of the material; Method for preventing material drooping and skid mark reduction in a walking beam type heating furnace comprising a.
KR1020080080470A 2008-08-18 2008-08-18 Device and method for preventing material droop and lessening skid mark of walking beam type reheating furnace KR20100021838A (en)

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KR1020080080470A KR20100021838A (en) 2008-08-18 2008-08-18 Device and method for preventing material droop and lessening skid mark of walking beam type reheating furnace

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Application Number Priority Date Filing Date Title
KR1020080080470A KR20100021838A (en) 2008-08-18 2008-08-18 Device and method for preventing material droop and lessening skid mark of walking beam type reheating furnace

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101442915B1 (en) * 2012-11-07 2014-09-24 주식회사 포스코 Method for controlling skid beam moving pattern in furnace and thereof apparatus
KR102046906B1 (en) 2018-10-10 2019-11-20 부공산업 주식회사 Skid rail for heating furnaces

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101442915B1 (en) * 2012-11-07 2014-09-24 주식회사 포스코 Method for controlling skid beam moving pattern in furnace and thereof apparatus
KR102046906B1 (en) 2018-10-10 2019-11-20 부공산업 주식회사 Skid rail for heating furnaces

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