KR101726049B1 - Rotatable electric furnace - Google Patents

Rotatable electric furnace Download PDF

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Publication number
KR101726049B1
KR101726049B1 KR1020150083931A KR20150083931A KR101726049B1 KR 101726049 B1 KR101726049 B1 KR 101726049B1 KR 1020150083931 A KR1020150083931 A KR 1020150083931A KR 20150083931 A KR20150083931 A KR 20150083931A KR 101726049 B1 KR101726049 B1 KR 101726049B1
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KR
South Korea
Prior art keywords
furnace body
driving unit
furnace
rotation driving
stand
Prior art date
Application number
KR1020150083931A
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Korean (ko)
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KR20160148082A (en
Inventor
정현돈
Original Assignee
주식회사 포스코
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Priority to KR1020150083931A priority Critical patent/KR101726049B1/en
Publication of KR20160148082A publication Critical patent/KR20160148082A/en
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Publication of KR101726049B1 publication Critical patent/KR101726049B1/en

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    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
    • 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/12—Rotary-drum furnaces, i.e. horizontal or slightly inclined tiltable

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

The present invention relates to an electric furnace, which comprises a furnace body; A stand having a through hole through which the furnace body is rotatably seated to support the furnace body rotatably; A rotation driving unit interlocked with the furnace body to rotate the furnace body; And a movement driving unit connected to the rotation driving unit to selectively move the rotation driving unit toward or away from the furnace body so that the refractory of the furnace can be uniformly used without local erosion to increase the number of times of use of the furnace body, Reduction in productivity and productivity can be obtained.

Description

[0001] ROTATABLE ELECTRIC FURNACE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric furnace capable of rotating, and more particularly, to an electric furnace capable of preventing uneven wear of refractories by sensing the temperature in the electric furnace and rotating the furnace body while grasping the state of the refractory inside the furnace.

Generally, an electric furnace is an apparatus which heats and melts a metal or an alloy by using electric power. The electric arc is generated by energizing a high current to an electrode installed vertically in a loop for opening and closing an upper part of the electric furnace. And to dissolve the metal or alloy.

1 is a perspective view showing an electric furnace according to the prior art.

As shown in this figure, in the conventional electric furnace, a loop 2 is provided so as to be openable and closable above the furnace body 1, and three electrode rods 3 are inserted into the loop 2, for example. An arm 4 for raising and lowering these electrode rods is coupled to the electrode rod.

A discharge duct 5 for discharging dust generated inside the furnace body 1 to the outside is provided at one side of the roof 2.

The inner wall of the furnace body 1 is made of a refractory (not shown) to contain dissolved molten steel.

Thus, the loops 2 are removed from the upper portion of the furnace body 1, the objects to be melted such as metal or alloys are put in the state that the inside of the furnace body is opened and then the loops are covered again, Thereby melting the object to be melted.

The furnace body 1 is fixedly placed on a stand 6, a tilting cylinder 7 is connected to the lower end of the stand, and the tilting cylinder tilts the furnace.

However, when the number of times of use of the furnace body exceeds the mid-term, the rate of erosion of the refractory material inside the furnace body differs for each portion. In particular, if the arc occurs only at a certain position, the heat due to the arc in the electric furnace is inevitably distributed unevenly, thereby causing damage only to a specific portion in the electric furnace.

(Patent Document 1) KR 2003-0044716 A

Accordingly, it is a primary object of the present invention to provide an electric furnace capable of preventing uneven wear of a refractory by rotating a furnace body while sensing the state of refractory inside the furnace by sensing the temperature in the furnace.

An electric furnace according to an embodiment of the present invention includes: a furnace body; A stand having a through hole through which the furnace body is rotatably seated to support the furnace body rotatably; A rotation driving unit interlocked with the furnace body to rotate the furnace body; A movement driving unit connected to the rotation driving unit and selectively moving the rotation driving unit toward or away from the furnace body; And a stopper installed on a support frame coupled to the stand, the stopper preventing relative rotation between the stand and the furnace body, wherein the stopper includes a tightening cylinder provided on the support frame, And an accommodating portion for accommodating an end portion of the actuating rod is inserted by inserting an actuating rod of the cylinder.

Further, in the electric furnace of the present invention, the furnace body is provided with a plurality of temperature sensing portions.

As described above, according to the present invention, it is possible to prevent the uneven wear of the refractory by rotating the furnace body while grasping the state of the refractory inside the furnace body by sensing the temperature in the furnace, thereby preventing the early replacement of the refractory and increasing the cost accordingly There is an effect that can be done.

In addition, according to the present invention, since the refractory inside the furnace body can be used uniformly, the life of the furnace body can be improved as a whole, and the number of times of stoppage and time can be reduced to improve the productivity.

Furthermore, since the refractory can be uniformly used in the electric furnace and the degree of erosion can be grasped, there is a side effect of preventing a large-scale facility accident due to the leakage of molten steel.

1 is a perspective view showing a part of an electric furnace according to the prior art.
2 is a front view showing an electric furnace according to an embodiment of the present invention.
3 is an enlarged view of A shown in Fig.
4 is an enlarged view of B shown in Fig.
5 is a view showing a tilting state of an electric furnace according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 2 is a front view showing an electric furnace according to an embodiment of the present invention, FIG. 3 is an enlarged view of FIG. 2, and FIG. 4 is an enlarged view of FIG.

As shown in these drawings, an electric furnace according to an embodiment of the present invention includes a furnace body 10; A stand (20) formed with a through hole (21) rotatably seated on the furnace body and rotatably supporting the furnace body; A rotation driving unit (30) interlocked with the furnace body to rotate the furnace body; And a movement driving unit 40 connected to the rotation driving unit and selectively advancing and retracting the rotation driving unit toward or away from the furnace body.

On the upper side of the furnace body 10, a loop 12 is provided so as to be openable and closable, and three electrode rods 13, for example, are inserted into the loop. The loop is suspended on the support frame 11 and placed on the furnace body. An arm (14) for raising and lowering these electrode rods is coupled to the electrode rod.

This furnace body 10 is placed on a stand 20, which is engaged with a support frame to support the lower portion of the support frame 11. [ A through hole (21) is formed in the stand, and a bearing (22) is interposed between the through hole and the hearth.

The outer ring 23 of the bearing 22 is fixed to the inner circumferential surface of the through hole 21 formed in the stand 20 and the inner ring 24 of the bearing is fixed to the outer circumferential surface of the furnace body 10. [ A plurality of rotating members 25 such as rollers and balls are disposed between the inner and outer rings. Due to the interposition of such bearings, the furnace body can rotate smoothly with respect to the stand.

A tilting cylinder 27 is connected to the lower end of the stand 20 so that the tilting cylinder can tilt the electric furnace.

5, an arc-shaped tilting gear 26 is provided at one side of the bottom surface of the stand 20 and a rack gear 28 engaged with the tilting gear is installed on the upper surface of the support wall 29 do. When the furnace body 10 tilts forward and backward together with the stand by the operation of the tilting cylinder 27, the tilting gear is moved along the rack gear.

The rotation drive unit 30 includes a drive motor 31 and a pinion 32 connected to receive rotational force from the drive motor. A speed reducer (not shown) may be interposed between the drive motor and the pinion. Here, an electric motor or a hydraulic motor may be employed as the driving motor.

A substantially belt-shaped rotary gear 16 is provided on the outer circumferential surface of the furnace body 10 so as to be engaged with the pinion 32 of the rotary drive section 30 and extending by a predetermined length in the circumferential direction.

Accordingly, the pinion 32 is rotated by the rotational force transmitted from the drive motor 31, and the pinion and the rotary gear 16 are engaged with each other so that the furnace body 10 can rotate in the circumferential direction by a predetermined angle .

Here, the drive motor 31 (for example, an electric motor or a hydraulic motor) having a proper capacity, the pinion 32 having an appropriate size, and the rotation gear 16 ) Is provided.

The rotation driving unit 30 is connected to the movement driving unit 40. The movement driving unit is composed of a moving cylinder 42 mounted on a separate support member 41, Is coupled with the bracket 33 provided with the rotation drive portion.

As a result, the rotary drive unit 30 is advanced to the furnace body by the expansion and contraction of the moving cylinder 42, and the pinion 32 is engaged with the rotation gear 16 or retreated in the opposite direction, The engagement can be released.

The provision of the movement drive unit 40 as described above makes it possible to eliminate interference with components such as the parts related to the rotation drive unit 30, components such as wiring, and the like during the tilting of the electric furnace.

In addition, the electric furnace according to an embodiment of the present invention may include a stopper 50 for preventing relative rotation between the furnace body 10 and the stand 20 during tilting.

The stopper 50 is composed of a fastening cylinder 52 provided on the support frame 11 described above. The operating rod 53 of the fastening cylinder 52 is inserted into one side surface of the furnace body 10 and a receiving portion 17 for holding the end portion thereof is provided.

2, in the electric furnace according to the embodiment of the present invention, a plurality of temperature sensing units 60 may be installed in the furnace body 10. [

The temperature sensing portion 60 may include a temperature sensor, for example, a thermocouple extending through the outer tube of the furnace body 10 and extending into the refractory constituting the inner wall of the furnace body. The temperature sensing unit may be disposed at an appropriate interval of about 10 to 20, preferably about 12, in the circumferential direction of the furnace body.

The temperature inside the electric furnace can be generally determined through the temperature sensing unit 60 as described above. That is, the temperature distribution along the circumferential direction of the electric furnace can be known. For example, when the number of times of use of the furnace body 10 is in the middle, the rate of erosion of the refractory material inside the furnace body differs depending on each site, and the temperature measured by the temperature sensor at a specific position, Lt; RTI ID = 0.0 > temperature. ≪ / RTI > As a result, by sensing the temperature in the electric furnace, the state of the refractory inside the furnace body can be grasped.

In addition, the refractory is reduced in thickness (radial length of the furnace body) over time. The temperature of the refractory is reduced, so that the position of the heat source can be automatically controlled so that the heat source is in the proper position. The degree of erosion of the refractory can be grasped.

Further, in order to ensure smooth flow of molten steel, the temperature of the molten steel must be high so as to ensure the fluidity of the molten steel, so that it is possible to obtain an additional advantage of detecting the proper drawing time of molten steel by sensing the temperature in the electric furnace.

2, an electric furnace according to an embodiment of the present invention includes a plurality of temperature sensing units 60, a driving motor 31 of a rotation driving unit 30, a tilting cylinder 27, a movement driving unit 40, A control unit 70 electrically connected to the moving cylinder 42 of the stopper 50 and the tightening cylinder 52 of the stopper 50 may be further included.

The control unit 70 receives the temperature measurement signal from the temperature sensing units 60 and then the temperature measured by the temperature sensing unit at the specific position is excessively elevated relative to the temperature measured by the temperature sensing unit at another position , And controls the drive motor 31 to rotate the furnace body 10 by a predetermined angle. In addition, it is possible to control the operation of the tilting cylinder 27, the moving cylinder 42, the tightening cylinder 52 and the like necessary for the operation of the electric furnace.

The operation of the electric furnace according to one embodiment of the present invention will be described.

First, the loop 12 is removed from the upper portion of the furnace body 10, the object to be melted such as metal or alloy is put in a state where the furnace body is opened, then the loop is covered again and the arm 14 is operated . At this time, the operating rod 53 of the fastening cylinder 52 constituting the stopper 60 is elongated and its end portion is inserted into the receiving portion 17 of the furnace body.

A high current is supplied to the electrode rod 13 to generate an arc, and the molten object charged into the furnace body 10 is dissolved. At the same time, the temperature in the electric furnace is measured by the temperature sensing units 60.

The operation rod 53 of the tightening cylinder 52 is contracted so that the end of the operation rod 53 is moved away from the receiving portion 17 of the furnace body 10 And the operating rod 43 of the moving cylinder 42 is extended so that the rotational driving portion 30 is advanced toward the furnace body so that the pinion 32 is engaged with the rotating gear 16. [ Subsequently, the drive motor 31 is operated to rotate the pinion connected to the drive motor.

When the pinion 32 is rotated, the rotation gear 16 meshing with the pinion is rotated together with the rotation of the pinion 32, whereby the furnace body 10 rotates in the circumferential direction by a predetermined angle.

Since the bearing 22 is interposed between the furnace body 10 and the stand 20, the furnace body can rotate smoothly with respect to the stand. The rotational angle and speed of the furnace body are controlled by the rotation speed of the drive motor 31, And the like can be controlled. The furnace body rotates at a speed of about 5 RPM or less, preferably about 1 RPM.

In this case, since the bearing 22 is interposed between the furnace body and the stand 20, the small size of the drive motor 31 is small, There is an advantage that the furnace body can be stably rotated without rocking on the stand by only the driving force.

When the furnace body 10 rotates, the loop 12 hanging on the support frame 11 from above the furnace body can be held, for example, at a height of several Cm and fixed without rotating with the furnace body. Here, the electrode rod 13 inserted in the furnace body through the loop also remains fixed with the loop.

In this case, as the furnace body 10 rotates at a slow speed without swinging, a high current is supplied to the electrode rod 13 during the rotation of the furnace body so that the melting of the object to be melted can be continuously performed by the arc.

When the furnace body 10 is rotated in the circumferential direction by a predetermined angle, the loop 12 is lowered again.

Therefore, even if a non-uniform temperature distribution occurs in the electric furnace, the furnace body 10 can be rotated to uniformly use the refractory inside the furnace body, thereby preventing uneven wear of the refractory, The number of times of stopping and the time and the like can be reduced, and the productivity can be improved.

After the object to be melted in the electric furnace is dissolved, the furnace body 10 is rotated in the home position, that is, the driving motor 31 is operated in the reverse direction, and the pinion 32 rotates the furnace body in the direction of returning the furnace body by a predetermined angle. Of course, the loop 12 hanging from the support frame 11 while the furnace body is rotating can be held somewhat raised from the furnace body and fixed without rotating with the furnace body.

When the furnace body 10 reaches the home position, the operating rod 53 of the fastening cylinder 52 constituting the stopper 60 is extended and the end of the operating rod 53 is inserted into the housing portion 17 of the furnace body. The engagement of the pinion 32 and the rotary gear 16 is released by causing the rotary drive portion 30 to retract from the furnace body.

In this state, the furnace body 10 is fixed so as not to rotate with respect to the stand 20, and when the melting operation of the furnace is completed, the furnace body is tilted by the tilting cylinder 27 connected to the lower end of the stand, The molten steel is discharged through the outflow port 18, for example.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Noche 20: stand
22: Bearing 27: tilting cylinder
30: rotation drive unit 31: drive motor
32: pinion 40:
42: transfer cylinder 50: stopper
52: fastening cylinder 60: temperature sensing unit
70:

Claims (7)

Noche;
A stand having a through hole through which the furnace body is rotatably seated to support the furnace body rotatably;
A rotation driving unit interlocked with the furnace body to rotate the furnace body;
A movement driving unit connected to the rotation driving unit and selectively moving the rotation driving unit toward or away from the furnace body; And
A stopper provided on a support frame coupled to the stand for preventing relative rotation between the stand and the furnace body,
/ RTI >
Wherein the stopper includes a tightening cylinder provided in the support frame,
And an accommodating portion for accommodating an end portion of the actuating rod is inserted into one side surface of the furnace body by inserting an operating rod of the engaging cylinder. The method according to claim 1,
Wherein the rotation driving unit includes a driving motor and a pinion connected to receive a rotational force from the driving motor,
And an outer peripheral surface of the furnace body is provided with a rotating gear in a circumferential direction so as to be engaged with the pinion of the rotary drive portion. The method according to claim 1,
Wherein the movement driving unit includes a moving cylinder provided on a support member,
And one end of the operating rod of the moving cylinder is coupled with a bracket provided with the rotation driving portion. delete delete The method according to claim 1,
Further comprising a plurality of temperature sensing portions spaced apart in the circumferential direction of the furnace body. The method according to claim 6,
A plurality of temperature sensing units electrically connected to the plurality of temperature sensing units,
Further comprising a control unit for controlling the rotation driving unit to rotate the furnace body by a predetermined angle when the temperature measured by the temperature sensing unit at the predetermined position rises relative to the temperature measured by the temperature sensing unit at another position, in.
KR1020150083931A 2015-06-15 2015-06-15 Rotatable electric furnace KR101726049B1 (en)

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KR1020150083931A KR101726049B1 (en) 2015-06-15 2015-06-15 Rotatable electric furnace

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Application Number Priority Date Filing Date Title
KR1020150083931A KR101726049B1 (en) 2015-06-15 2015-06-15 Rotatable electric furnace

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KR20160148082A KR20160148082A (en) 2016-12-26
KR101726049B1 true KR101726049B1 (en) 2017-04-12

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200488522Y1 (en) * 2018-08-25 2019-02-14 신용성 Rotatable electric furnace
CN113983824B (en) * 2021-11-15 2023-09-26 西安慧金科技有限公司 Gear ring type locking mechanism suitable for furnace body

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09273865A (en) * 1996-04-05 1997-10-21 Nippon Steel Corp Rotary type refining apparatus
KR20050007037A (en) * 2003-07-11 2005-01-17 주식회사 포스코 Furnace body rotation dissolution type electric furnace with rotation decision function
JP6183073B2 (en) * 2013-08-31 2017-08-23 大同特殊鋼株式会社 Arc furnace

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