KR20170044223A - Method for opening aperture of ladle - Google Patents

Method for opening aperture of ladle Download PDF

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Publication number
KR20170044223A
KR20170044223A KR1020150143194A KR20150143194A KR20170044223A KR 20170044223 A KR20170044223 A KR 20170044223A KR 1020150143194 A KR1020150143194 A KR 1020150143194A KR 20150143194 A KR20150143194 A KR 20150143194A KR 20170044223 A KR20170044223 A KR 20170044223A
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KR
South Korea
Prior art keywords
hose
molten steel
cleaning hose
cleaning
portable type
Prior art date
Application number
KR1020150143194A
Other languages
Korean (ko)
Inventor
김용균
권오훈
송하진
김인수
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 KR1020150143194A priority Critical patent/KR20170044223A/en
Publication of KR20170044223A publication Critical patent/KR20170044223A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor
    • B22D41/186—Stopper-rods therefor with means for injecting a fluid into the melt

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

Disclosed is a method for opening a molten steel inlet. According to an embodiment of the present invention, the method of opening a molten steel inlet comprises the following steps of: preparing a portable type opening device; positioning a front end of a cleaning hose connected to an induction pipe of the portable type opening device at a lower end of a shroud nozzle coupled to a lower portion of a collect nozzle using the portable type opening device; moving the front end of the cleaning hose to a sliding gate provided at a molten steel inlet of a ladle through the shroud nozzle and the collect nozzle by pushing the cleaning hose using a delivery roller of the portable type opening device; and opening a clogged portion of the molten steel inlet by injecting oxygen or other gas to the cleaning hose. The present invention intends to provide a method for opening a molten steel inlet capable of improving convenience and safety of work and shortening an opening time of a molten steel inlet.

Description

[0001] METHOD FOR OPENING APERTURE OF LADLE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of opening a molten steel inlet, and more particularly, to a method of opening a molten steel inlet to remove clogging of the molten steel inlet of a ladle or tundish of a continuous casting machine.

In general, a continuous casting machine is a machine for continuously producing a cast steel having a constant shape, that is, a semi-finished product for rolling, by supplying molten steel produced in a steelmaking furnace to a mold for continuous casting machine through a ladle and a tundish.

In the continuous casting machine, the ladle is used to receive molten steel produced in the steelmaking furnace, and has a molten steel ingot which can supply the molten steel stored in the lower portion to the tundish.

The filler material is filled in the filler material, and the filler material is naturally opened by the molten steel supplied to the inside in a clogged state, and the molten steel is introduced into the tundish.

However, although the molten steel injection port of the ladle is naturally opened due to the dissolution of the filler material, the slag and the filler in the molten steel are entangled with each other and the natural hole is not formed frequently.

When the molten steel injection port of the ladle is not opened, the ladle opening pipe is inserted into the molten steel injection port to open the steel material.

Published Utility Model Publication No. 1998-028134 (published Aug. 5, 1998)

Embodiments of the present invention are to provide a method of opening a molten steel inlet opening that shortens the opening time of the molten steel inlet and improves the convenience of operation and safety.

According to an aspect of the present invention, there is provided a method of manufacturing a portable type air conditioner, comprising the steps of preparing a portable type air conditioner and guiding the air to a lower end of a shroud nozzle coupled to a lower portion of the collect nozzle using the portable type air conditioner, A washing hose entry step for placing the tip of the washing hose by pushing the washing hose by using a delivery roller of the portable type airborne apparatus, the tip of the washing hose being connected to the molten metal of the ladle through the shroud nozzle and the collect nozzle A washing hose injecting step of moving the sliding gate to a sliding gate provided at the injection port and a pouring step of pouring the clogged portion of the molten steel inlet by injecting oxygen or gas into the washing hose.

The tip of the washing hose also includes a ball head for facilitating movement of the washing hose in the washing hose injection step.

Further comprising a gate closing step and a gate opening step for closing and opening the sliding gate after the preparation step and after the cleaning hose injection step, respectively, and raising the ladle turret before entering the cleaning hose, And a turret descending step of descending the ladle turret after the opening step.

According to another aspect of the present invention, there is provided a method of preparing a portable type air conditioner, comprising the steps of: preparing a portable type air conditioner; A cleaning hose for guiding the tip of the cleaning hose guided to the pipe, and a cleaning hose for guiding the tip of the cleaning hose to the sliding gate via the immersion nozzle by pushing the cleaning hose using the delivery roller of the portable- And a pouring step of pouring the clogged portion of the molten steel inlet by injecting oxygen or gas into the pouring hose.

The tip of the washing hose also includes a ball head for facilitating movement of the washing hose in the washing hose injection step.

In addition, the cleaning hose injection step may further include controlling the rotational speed of the delivery roller to adjust the moving speed of the cleaning hose.

The guide tube is detachably coupled to a frame provided with the delivery roller, and the preparing step further includes mounting the cleaning hose to the guide tube while the frame and the guide tube are separated from each other.

Embodiments of the present invention can prevent the scattering of the molten steel ejected after the hole by performing the oxygen cleaning hole with the shroud nozzle attached to the collecting nozzle of the ladle, so that the safety of the operator can be achieved.

Further, the embodiments of the present invention can prevent the molten steel discharged after the oxygen cleaning hole from being exposed to the atmosphere, thereby minimizing the secondary oxidation of the molten steel, thereby preventing deterioration in quality due to lowering of the molten steel cleanliness.

1 schematically shows a continuous casting machine according to an embodiment of the present invention.
2 is a flowchart illustrating a method for opening a molten steel inlet according to an embodiment of the present invention.
FIG. 3 schematically shows a pit apparatus according to an embodiment of the present invention.
4 is an operational state diagram illustrating a ladle opening process using a pore device according to an embodiment of the present invention.
Fig. 5 schematically shows a conventional ladle laying method.
6 schematically shows a conventional tundish opening method.
7 is an operational state diagram illustrating a tundish opening process using a pit apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

1 schematically shows a continuous casting machine according to an embodiment of the present invention.

1, the continuous casting machine includes a ladle 10 containing molten steel, a ladle turret 11 which supports and rotates and lifts the ladle 10 and the subsequent ladle 10a, A tundish 20 positioned midway between the ladle 10 and the mold 30 for temporarily storing molten steel supplied from the ladle 10 and storing the molten steel temporarily from the tundish 20 through the dipping nozzle 40 A mold 30 for receiving molten steel and initially solidifying the molten steel into a predetermined shape and a roll 30 capable of bending or straightening the casting while taking heat from the non-solidified casting and completing solidification, (50) composed of a spray nozzle and a cutting device (60) for cutting the billet having passed through the secondary cooling bed (50) to a predetermined length.

That is, the molten steel refined in the steelmaking process is accommodated in the ladle 10 and is supported by the ladle turret 11, and is supplied to the tundish 20 through a sliding gate, a collect nozzle and a shroud nozzle provided below the molten steel inlet And molten steel temporarily stored in the tundish 20 is supplied to the mold 30 through the sliding gate and the immersion nozzle provided below the molten steel inlet of the tundish 20. The molten steel supplied into the mold 30 is first solidified in the mold 30 and then passed through the secondary cooling stand 50 to complete solidification and is cut to a predetermined length by the cutting device 60, Slabs, blooms, and the like, and then transported to the yard or the like along the transporting rollers 61.

At this time, if clogging occurs in the molten steel injection port of the ladle 10 or the tundish 20, the molten steel injection function for the tundish 20 or the mold 30 is lost and continuous casting operation is impossible. Therefore, The work should be done.

FIG. 2 is a flow chart illustrating a method for opening a ladle inlet of a ladle according to an embodiment of the present invention. FIG. 3 is a schematic view of a porous apparatus according to an embodiment of the present invention, Fig. 3 is an operational state diagram showing a process of opening using a piercing device. Fig.

2 to 4, a method for opening ladle melting hole according to an embodiment of the present invention includes a preparing step S10, a gate closing step S20, a turret raising step S30, a washing hose raising step S40, A cleaning hose injection step S50, a gate opening step S60, a opening step S70, and a turret descent step S80.

As shown in FIG. 3, the preparation step S10 is a step of preparing a porous structure 70 for performing oxygen cleaning on the molten steel inlet.

The opening device 70 is vertically disposed in a frame 71 provided in a portable form in which a worker is portable and is rotated by rotating the cleaning hose 80 to push the cleaning hose 80, And a delivery roller 72 for transporting the hose 80.

The delivery roller 72 is connected to a speed controllable motor 73 and an operation switch 74 for controlling the speed of the motor 73 is installed on one side of the frame 71. [

A long induction pipe 75 for guiding the entry of the washing hose 80 into the molten steel inlet is connected to the front of the frame 71 and the distal end of the induction pipe 75 is connected to a curved curve 75a ).

The handle 71 is provided at one side of the frame 71 with a handle 76 for carrying convenience of the operator.

The cleaning hose 80 is made of a flexible material and enters into the frame 71 through an inlet 77 provided at the rear of the frame 71 and then passes through the frame 71 The distal end can be protruded through the induction pipe 75 coupled to the front of the endoscope.

A ball-shaped ball head 81 is attached to the tip of the cleaning hose 80 to prevent insertion interruption due to the engagement of the protruding portion during insertion into the molten metal injection port, The rear end of the cleaning hose 80 is connected to a coupling 78 connected to the oxygen supply hose.

Meanwhile, the induction pipe 75 coupled to the front of the frame 71 of the perforation device 70 according to the embodiment of the present invention may be removably installed.

The worker mounts the cleaning hose 80 to the delivery roller 72 and the guide pipe 75 and separates the guide pipe 75 from the guide pipe 75. [ It is possible to perform the operation with only the gripper 75 held.

The gate closing step S20 is a step of closing the sliding gate 14 provided in the molten steel inlet 13 of the ladle 10 to prevent the molten steel filled in the ladle 10 from flowing out.

The turret rising step S30 is a step of raising the turret 11 supporting the ladle 10 so that the shroud nozzle 15 drawn into the tundish 20 is exposed above the tundish 20.

The washing hose entering step S40 is a step of placing the ball head 81 of the washing hose 80 mounted on the opening device 70 at the lower portion of the shroud nozzle 15. [

The operator places the ball head 81 protruding from the end of the induction pipe 75 at the lower portion of the exposed shroud nozzle 15 at the top of the tundish 20 while holding the perforation device 70 .

The cleaning hose injection step S50 is a step of moving the ball head 81 of the cleaning hose 80 located under the shroud nozzle 15 toward the molten steel inlet 13.

Here, when the operator operates the operation switch 74 to rotate the delivery roller 72, the delivery roller 72 pushes the cleaning hose 80 so that the cleaning hose 80 is guided to the guide tube 75 And the ball head 81 provided at the end of the cleaning hose 80 moves to the sliding gate 14 through the shroud nozzle 15 and the collect nozzle 16. [ At this time, the cleaning hose 80 can be inserted into the sliding gate 14 by one stroke without being interrupted by the ball head 81 during the movement.

The operator can adjust the insertion speed of the cleaning hose 80 by controlling the rotation speed of the delivery roller 72 through the operation of the operation switch 74.

The gate opening step S60 is performed when the ball head 81 of the cleaning hose 80 reaches the sliding gate 14 and the sliding gate 14 is opened to perform the oxygen cleaning opening operation on the clogged portion of the molten steel inlet 13 14 is opened.

The opening step S70 is a step of opening the clogged portion of the molten steel inlet 13 by opening the oxygen valve and injecting oxygen into the cleaning hose 80. [

At this time, the oxygen injected by the washing hose 80 and the high temperature are solidified and are now melted and removed by the oxidation reaction, and the clogging of the molten steel injection port 13 is solved.

The turret descending step S80 is a step of descending the turret 11 for a continuous casting operation in a state where the opening device 70 is separated from the shroud nozzle 15 after the opening of the molten steel inlet 13 is completed.

The molten steel ingot opening method through the above-described steps has the following remarkable effect as compared with the existing open method shown in FIG.

5, in order to perform the opening of the molten steel inlet 13, the oxygen washing pipe 18 is inserted into the lower end of the collect nozzle 16 while the shroud nozzle 15 is removed, It is necessary to perform repetitive work for re-joining the shroud nozzle 15 after the hole is formed, and the procedure of the pouring work becomes complicated. Also, there is a risk of scattering of molten steel discharged at the time of oxygen cleaning, A large amount of oxidation impurities due to oxidation due to oxidation due to oxidation due to oxidation is required and a skilled worker is required since the shroud nozzle 15 must be re-coupled. However, according to the opening method of the present embodiment, The molten steel discharged after being opened by the oxygen cleaning can be sprayed only into the shroud nozzle 15 to prevent the molten steel from flowing out and scattering Owing to the simplified working method and the oxygen cleaning opening work by inserting the cleaning hose 80 using the opening device 70, it is possible to secure the operator's safety by a convenient working method that can be performed even for the unskilled worker, 80 can be rapidly and continuously supplied to the clogged position of the molten steel injection port 13, thereby ensuring a one-hole opening workability. Since the small-sized and lightweight portable type airborne apparatus 70 does not interfere with the structure of a site facility, .

Hereinafter, a method for forming a clogged portion of a molten steel inlet of a tundish using a piercing apparatus according to an embodiment of the present invention will be described with reference to FIG.

6, in order to open the molten steel inlet 21 of the existing tundish 20, the operator directly inserts the oxygen cleaning pipe 18 into the molten steel in the tundish 20 to perform the oxygen cleaning opening operation However, in such a case, a large amount of molten steel oxidation impurities due to the blowing of oxygen is generated in the molten steel in the tundish 20, and only a skilled worker has to perform such work in order to drill a hole into the molten steel inlet 21 , And when the one-hole opening fails, the hole efficiency due to the repeated oxygen washing is deteriorated.

7, the method for opening a molten steel inlet according to an embodiment of the present invention includes an induction pipe 75 into which a cleaning hose 80 of a flexible material having a ball head 81 at its tip end is inserted, A preparation step of preparing a porous apparatus 70 having a delivery roller 72 for pressing and pushing the slidable surface of the tundish 20 and a slide gate 72 provided in the molten steel inlet 21 of the tundish 20 using the prepared porous system 70 A washing hose entry step for placing the ball head 81 in the lower discharge port 26 of the immersion nozzle 25 coupled to the lower end of the immersion nozzle 25 and the ball head 81 to the lower discharge port 26 of the immersion nozzle 25 A cleaning hose injection step of moving the ball head 81 upward through the immersion nozzle 25 to the sliding gate 24 by pushing the cleaning hose 80 using the delivery roller 72 And a pouring step of injecting oxygen into the cleaning hose 80 so as to open a clogged portion of the molten steel inlet 21.

According to such an opening method, the cleaning hose 80 is inserted through the discharge port of the immersion nozzle 25 to perform oxygen cleaning, thereby eliminating the problem that a large amount of oxidizing impurities generated by the oxygen injection in the molten steel is eliminated, 25) By performing the oxygen cleaning by inserting the cleaning hose 80 while checking the discharge port 26 with the naked eye, unskilled operators can perform one insertion, thereby restricting the limitation of the open worker for oxygen cleaning, It is possible to secure the forced air-tightness efficiency, which prevents the repeated oxygen-cleaning operation. In addition, due to the small size and light weight of the portable type airborne device 70, the space efficiency is not limited by the structure of the on-site facilities, and high cost ratio can be pursued by securing high efficiency workability for the low- The worker can work in a stable working posture, thereby ensuring ease of operation and safety.

10: Ladle, 11: Turret,
20: tundish, 13,21: molten steel inlet,
14, 24: sliding gate, 15: shroud nozzle,
16: collect nozzle, 25: immersion nozzle,
70: opening device, 72: delivery roller,
75: guide tube, 80: washing hose,
81: Ball head.

Claims (7)

Preparing a portable type airborne apparatus;
A washing hose entry step of placing the tip of the washing hose guided to the lower end of the shroud nozzle coupled to the lower portion of the collect nozzle using the portable type of piercing apparatus to the induction pipe of the portable type airborne apparatus;
A cleaning hose injecting step of moving the tip of the washing hose to the sliding gate provided in the molten steel inlet port of the ladle through the shroud nozzle and the collect nozzle by pushing the washing hose using the delivery roller of the portable type airborne apparatus;
And injecting oxygen or gas into the cleaning hose to open a clogged portion of the molten steel inlet. The method according to claim 1,
Wherein the cleaning hose has a ball head at its front end for facilitating movement of the cleaning hose in the cleaning hose injection step. 3. The method of claim 2,
Further comprising a gate closing step and a gate opening step for closing and opening the sliding gate after the preparation step and after the cleaning hose injection step, respectively,
Further comprising: a turret raising step of raising the ladle turret before entering the washing hose; and a turret raising step of raising the ladle turret after the raining step. Preparing a portable type airborne apparatus;
A washing hose entrance step of placing the tip of the washing hose guided to the induction pipe of the portable type air conditioner at the lower end of the immersion nozzle coupled to the lower portion of the sliding gate provided at the molten steel inlet of the tundish using the piercing apparatus;
A washing hose injecting step of moving the tip of the washing hose through the immersion nozzle to the sliding gate by pushing the washing hose by using a delivery roller of the portable type airborne apparatus;
And injecting oxygen or gas into the cleaning hose to open a clogged portion of the molten steel inlet. 5. The method of claim 4,
Wherein the cleaning hose has a ball head at its front end for facilitating movement of the cleaning hose in the cleaning hose injection step. 6. The method according to any one of claims 1 to 5,
Wherein the cleaning hose injecting step further comprises controlling the rotational speed of the delivery roller to adjust a moving speed of the cleaning hose. 6. The method according to any one of claims 1 to 5,
The induction pipe is detachably coupled to a frame provided with the delivery roller,
Wherein the preparing step further comprises mounting the washing hose to the induction pipe in a state in which the frame and the induction pipe are separated from each other.
KR1020150143194A 2015-10-14 2015-10-14 Method for opening aperture of ladle KR20170044223A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200075641A (en) 2018-12-18 2020-06-26 주식회사 포스코 Apparatus for eliminating slag in ladle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200075641A (en) 2018-12-18 2020-06-26 주식회사 포스코 Apparatus for eliminating slag in ladle

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