KR20020051964A - Apparatus for cutting slag from molten steel in converter - Google Patents

Abstract

PURPOSE: A multifunctional slag cutting apparatus of a converter is provided to improve quality of molten steel by efficiently cutting slag of the upper layer of molten steel during tapping of molten steel of the converter, and perform both mechanical slag cutting and spray type slag cutting using one apparatus on occasion. CONSTITUTION: In an apparatus for cutting outflow of slag of the upper layer part of molten steel during tapping of molten steel in a converter, the multifunctional slag cutting apparatus of a converter comprises a guide member(30) which is installed so that it is tilted to the lower side of a fixed beam(20) adjacently installed to the converter; a lance member(70) which is fixed to the lower part of a moving carriage that is movably installed at the guide member(30); and a clamping means(110) which is mounted onto the front part of the lance member(70) so that a plural cutting means(90) closing a tapping hole during tapping of molten steel in the converter are removably fixed to the clamping means(110).

Description

Multifunctional slag cutting device of converter {APPARATUS FOR CUTTING SLAG FROM MOLTEN STEEL IN CONVERTER}

The present invention relates to a slag cutting device (CUTTING APPARATUS) to prevent the slag of the upper part of the molten steel is not pulled out together with the molten steel during the tapping step of tapping the molten steel into the slabs after the molten steel in the converter during the steelmaking process. Slag cutting work by mechanical slag cutting method such as dart and check ball and injection method of argon gas injection, as well as improving the quality of molten steel by cutting slag of the upper layer of molten steel at the time of tapping It relates to a multi-functional slag cutting device of the converter so that all can be used as one device.

In general, after the molten steel is completed in the converter, the slag of the upper part of the molten steel flows out along with the molten steel when the molten steel is tapped into the steel slabs. It is known that slag located in the upper part of molten steel reaches the exit of the converter first due to the difference in the specific gravity of slag. It is known to account for about 15% of the total slag flow rate.

In the second stage, slag is discharged together with molten steel by the vortex of molten steel during the tapping period, accounting for about 60% of the total outflow, and finally, slag is discharged through the tapping hole at the completion of the tapping of the molten steel. It is known to reach 25% of the runoff.

However, since the outflow of the slag deteriorates the quality of the molten steel while the impurities contained in the slag melt in the molten steel, many studies have been conducted to prevent the outflow of the slag.

That is, in order to prevent the initial slag outflow, which is the first step, there is a method of inserting a mud plug or a metal plug into the tapping hole of the converter before tapping, and in the second step, the molten steel during tapping. It is virtually impossible to completely eliminate the cause of the slag flow because the slag flows out of the slag due to the vortex flow.

In the final step, the slag flows out through the tapping hole while setting up the converter at the end of the tapping of the converter, and this outflow of the slag is a mechanical slag that forcibly blocks the converter taping point when the tapping of the molten steel is completed. The cutting method and the injection method of cutting slag by injecting gas are used.

That is, the above mechanical slag cutting method uses a check ball or a dart to insert a check ball into the molten steel to block the exit hole of the converter at the completion of the molten steel in which the molten steel is pulled out over a certain time. To prevent the outflow of the slag while blocking the exit of the converter using a separate mechanism or darts.

In addition, the injection method is to inject argon gas, which is an inert gas in the upper molten steel, which is injected into the upper layer of the molten steel in the vertical direction of the converter exit during the molten steel of the converter slag of the slag directly below the converter outlet. It is pushed out of the tap by gas and blocks the outflow of slag.

However, in the conventional slag cutting operation according to the above-described mechanical slag cutting method by the check ball or dart and slag cutting method by gas spraying, although not shown in the drawing, usually the bar shape arbitrarily manufactured in a steel mill While the operator manually inputs a check ball or a dart by using the apparatus, a straight pipe nozzle is also placed in the upper part of the molten steel while the gas is sprayed, so that the slag cutting work is not efficient.

In particular, the conventional slag cutting method such as check ball, dart, and gas injection method using the separate equipment to perform the slag cutting work, each equipment production and maintenance work is required, Due to the complexity, it is difficult to install the line, while increasing the maintenance and maintenance costs of each facility, and there are various problems in that it is impossible to cut the slag quickly in an appropriate manner when the converter goes out.

The present invention has been made in order to achieve the object as described above, the object is to prevent the outflow of slag when the molten steel tapping of the converter in advance, to further improve the quality of the molten steel, while the dart and check ball input and It is to provide a multi-functional slag cutting device of a converter that can accommodate all of the argon gas input as a single device, which is more convenient and more efficient to operate.

In addition, another object of the present invention is to allow the lance of the device to be inserted into the converter to be cooled during operation, thereby extending the service life of the device and precisely tilting and linear movement, thereby introducing the slag cutting mechanism into the converter. And it is to provide a multi-functional slag cutting device of the converter to easily perform the injection operation and the position adjustment.

1 is a schematic diagram showing a state of use of the multi-functional slag cutting device of the present invention converter

Figure 2 shows the multifunctional slag cutting device of the present inventors,

(a) is a front view

(b) is a schematic side view

Figure 3 shows the guide bar and the lance in the multifunctional slag cutting device of the present inventors,

(a) is a schematic operating state diagram

(b) is a front view of the main part showing the equipment installed in the lance;

Figure 4 shows that the guide bar and the lance is connected to the moving carriage in the multifunctional slag cutting device of the present inventors,

(a) front view of the main part

(b) is a rear view

Figure 5 shows the lance tip of the present invention multi-functional slag cutting device,

(a) is the main part of dart mounted state

(b) is the main part of the check ball attached state

FIG. 6 illustrates the lance tip of FIG. 5.

(a) front view of the main part

(b) the lumbar side view

(c) the main part plan

7 is a view showing a sample rod fixed to the multifunctional slag cutting device of the present inventors,

(a) front view of the main part

(b) the lumbar side view

Figure 8 is a schematic diagram showing the working state of the present invention to simultaneously perform the slag cutting and clean operation of the molten steel by injecting the flux powder with argon gas into the molten steel of the converter as a multi-functional slag cutting device of the converter.

Explanation of symbols on the main parts of the drawings

1 .... slag cutting device 10 .... converter

12 .... Exit 20 .... Fixed Beam

22 .. Tilting Hinge 24 .... Tilting Unit

30 .... guide frame 32 ... guide rail

50 .... moving carriage 52,62b, 66a .... sprocket

54,66 .... Chain 56 .... Guide roll

60 .... Drive Units 62,62 '.... Electric and Air Motors

70 .... Lance beam 90 .... Cutting means

92 .... DART 94 .... CHECK BALL

96 .. Spray nozzle 98 .... Cooling nozzle

110 .... clamping means 112 .... main cylinder

114 .. Working bar 116 .... Double clamping block

118 .... Dart fixed block 120 .... Check ball fixed block

A .... Cooling air F ... Flux powder

G ... argon gas M ... molten steel

S .... slag W ... coolant

The present invention as a technical configuration for achieving the above object, in the apparatus for cutting the slag outflow of the molten steel upper layer during the tapping of the molten steel in the converter, so as to be able to tilt below the fixed beam provided adjacent to the converter. Guide member is installed; And,

A lance member fixed to a lower portion of a moving carriage installed to be movable to the guide member; And,

By providing a slag cutting device of the converter including a clamping means to be detachably fixed to a plurality of cutting means for blocking the exit port during the molten steel tapping of the converter to the front end of the lance member.

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

1 and 2 show in detail the use state and apparatus of the multifunctional slag cutting device of the present invention converter.

That is, when the molten steel M in the converter 10 is pulled out through the tapping hole 12, the cutting device 1 of the present invention for cutting that the slag S of the upper part of the molten steel flows out at the completion point thereof is large. The guide member 30 is installed to be tilted to the lower side of the fixed beam 20 installed adjacent to the converter 10, and fixed to the lower portion of the movable carriage 50 is installed to be movable to the guide member 30. Clamping is mounted to be detachably fixed to the lance member 70 and the cutting means 90 to block the tapping hole 12 during the molten steel tap of the converter 10 to the front end of the lance member 70 And means 110.

And, as shown in Figure 2, the guide member 30 is a guide beam of a linear beam shape fixed to the lower side of the tilting hinge 22 and the tilting unit 24 installed on both sides of the fixed beam (20). Is formed, the tilting unit 24 is made of a hoist unit, a hook 24a is connected to the guide frame 30, the guide frame 30 is configured to tilt in accordance with the operation of the hoist unit 24 do.

On the other hand, the tilting hinge 22, which is a reference axis when the guide frame 30 is tilted, has a fixing shaft 22a, 22b bolted to the rear of the fixed beam 20 and the guide frame 30 by a hinge shaft ( 22c), and the safety chain 26, which is a stabilizer, is connected to the front portion of the fixed beam 20 and the guide frame 30 at the same time.

On the other hand, as shown in Figure 2, the apparatus 1 of the present invention, the moving carriage 50 moving along the guide frame 30 and the rear portion of the lower portion of the moving carriage 50 is bolted to substantially move While having a lance member 70 is introduced into the converter 10, the clamping means 110 is mounted to the front of the lance member 70 in which the dart 96, which is a cutting means 90, is detachably clamped. .

Next, FIG. 3 shows the guide frame 30, the moving carriage 50, and the lance member 70 of the apparatus 1.

That is, as shown in Figure 3a, the moving carriage 50 is a drive unit 60 mounted to the rear end of the guide member 30, the drive sprocket mounted to the front and rear of the guide member 30. The conveying chain 54 which is rotationally driven along the 52 is fixed so as to move along the guide member 30 when the driving unit 60 is driven.

In addition, a plurality of guide rolls 56 engaged with the guide rail 32 protruding to the side of the guide member 30 are provided on both sides of the carriage 50.

On the other hand, Figure 3b shows a cutting means 90 for the injection of the gas (G) which is one of the slag cutting method of molten steel as described in the prior art portion, in a straight line below the lance member 70 And a spray nozzle 96 mounted to the front end of the lance member 70 in front of the installed first supply pipe 96a to inject gas G into the molten steel.

The second supply pipe 98a includes a plurality of cooling nozzles 98 arranged on the upper side of the lance member 70 to divide the cooling water W so as to prevent deformation due to heat during input of the converter of the lance member 70. ) Is mounted, and the inside of the lance 70 is shown schematically in FIG. 3B, but is equipped with an air pipe 98a 'installed outside the operating bar 114 for the operation of the cutting means 90. The end nozzle 98 'is installed to inject air toward the clamping means 110 to which the cutting means 90 are clamped.

Next, in FIG. 4, the drive unit 60 in the cutting device 1 of this invention is shown in detail.

That is, the drive unit 60 is a drive motor 62 mounted on the rear end fixed block 62a of the guide member 30, a motor sprocket 62b fixed to the motor shaft and the guide member ( 30 is provided with a transfer chain 66 fastened to the main sprocket 66a mounted on the fixed drive shaft 64 to the drive sprocket 52 mounted thereon, and when the motor sprocket 66a is driven. The conveying chain 54 having the carriage 50 fixed to the drive sprocket 52 of the guide member 30 is configured to rotate. The conveying chain 66 is a guide sprocket 66a installed in the fixed block 62a. ') The chain tension is adjusted.

And, as shown in Figure 4, the drive unit 60, when the electric drive motor 62 is stopped due to equipment failure or power off of the factory, the lance member 70 for emergency use from the converter. The air motor 62 'of the air drive to be separated is provided on the opposite side, and the drive configuration of the air motor 62' and the drive motor 62 is the same.

Next, FIGS. 5 and 6 illustrate the lance 70 at the cutting device 1 of the present invention. First, the lance member 70 may enter through the inlet 14 of the converter 10. The clamping means 110 is formed of a straight beam having a predetermined length so that the rear end thereof is firmly bolted to the lower portion of the carriage 50, and the clamping means 110 installed at the front end of the lance beam 70 is the guide member 30. Main cylinder 112 mounted to the rear end of the operation bar, an operation bar 114 connected to the cylinder to extend to the front end through the lance beam 70, and two-stage clamping mounted to the front end of the operation bar 114 It consists of block 116.

As shown in FIG. 6, the double clamping block 116 is integrally formed with the first dart fixing block 118a through which the front end of the operating bar 114 passes, and the operating bar 114 at the front thereof. A dart fixing block 118 formed as a moving second dart fixing block 118b to be detachably fixed to the dart 92, and a pivot 124 connected to the front end of the operation bar 114 and rotating. Connected to each other, and provided with a check ball fixing block 120 having a hook groove 120a to which the hook 94a of the check ball 94 is fixed, respectively, the dart and the check ball block 118 ( 120 should be configured to clamp only one of the darts 92 and the check ball 94.

In addition, the check ball fixing block 120 is fixed to the front end of the operating bar 114, the fixing plate (114a) is connected via two pivot shafts (122, 124) of the operating bar 114 When moving forward and backward, the upper pivot axis 124 is rotated about the axis.

On the other hand, as shown in Figure 5 and Figure 3b, the cutting means 90 for removing the slag outflow in the converter 10 is fixed as detachable as the clamping means 110, the slag of the upper portion of the molten steel of the converter 10. It consists of the dart 92 and the check ball 94 which cut out what (S) flows out when it comes out of molten steel, and also contains the injection nozzle 96 further.

Next, FIG. 7 illustrates a sampler 100 installed in the clamping means 110. The sampler 100 has a front end thereof by moving the lance beam 70 as shown in FIG. Entering into (10) the sampler 100 is made of a molten steel sample is a facility that is charged and solidified to facilitate the molten steel sampling operation.

Referring to the operation and effects of the present invention made in the above configuration in more detail as follows.

As shown in FIGS. 1 to 8, when the molten steel M in the converter 10 is tapped through the tapping hole 12, the slag S of the upper layer of the molten steel flows out together with the molten steel so that impurities of the slag are molten steel. When included in (M), slag cutting work is required to prevent slag from leaking out with molten steel because it degrades the quality of molten steel. Unlike in the past, the slag cutting work is properly performed as needed as a device. The multifunctional slat cutting device 1 of the invention is as follows.

First, while the refining operation in the converter is completed and the converter 10 is tilted, the argon gas G is moved in the vertical direction of the molten steel tap while the molten steel is tapped into the lower tapping ladle 10 'of the tapping hole 12. In the case of using the injection method for preventing the outflow of the slag S by injection, as shown in FIGS. 3B and 8, the lance beam 70 is moved forward to enter the converter 10 to enter the slag S. When positioned on the upper side of), argon gas G is injected through the injection nozzle 96 provided at the tip of the lance beam 70.

At this time, as shown in Figure 3b, the injection nozzle 96 is a gas is injected into the molten steel through a supply pipe 96a mounted in the longitudinal direction to the lance beam 70, and at the same time through the injection nozzle 96 The flux powder (F) can be injected into the molten steel at the same time as the gas, such flux powder (F) by the degassing and dephosphorization of the molten steel to make the molten steel clean, the injection nozzle 96 of the present invention When used, it provides an additional advantage that the clean work of molten steel (M) can be performed at the same time.

Next, as shown in Figure 1, to cut the slag (S) of the upper layer of the molten steel when the tapping of the molten steel is completed using a dart (92) or check ball (CHECK BALL) 94 The mechanical cutting method is as follows.

First, as shown in FIGS. 2 and 5, the moving carriage 50 moves along the guide frame 30 as the driving unit 60, and at the same time, the lance beam 70 fixed to the lower side is advanced. When the converter 10 enters through the inlet 14, as described above, the guide frame 30 is tilted at the same time as the lance beam 70 is tilted to fix the dart of the clamping means 110 mounted at the front end thereof. The dart 92 or the check ball 94 clamped to the block 118 or the check ball fixing block 120 moves forward and backward by the operation of the main cylinder 112 installed at the rear of the lance beam 70. The bar 114 is injected into the molten steel.

That is, as shown in Figures 5 and 6, the clamping means 110 mounted on the front end of the lance beam 70 is a two-stage ramping block 116, the dart fixing block 118 and the check ball fixing block ( 120).

Therefore, when the operation bar 114 is advanced by the operation of the cylinder 112, the second dart fixing block 118b, which is first fixed to the front end thereof, moves backward and the first dart fixing block 118a in front thereof. Between the fixing grooves 118c into which the upper end of the dart 92 is inserted is spaced or in close contact with the molten steel of the dart 92.

In addition, the fixing plate 114a is bolted to the distal end of the operation bar 114, and the fixing plate 114a is fixed to the check ball fixing block 94 through two pivot shafts 122 and 124. It is connected to the check ball fixing block 120 is fixed to the hook portion (94a) is fixed to 120a, and eventually the check ball fixing block 120 is horizontal while the operation bar 114 is advanced When the operation bar 114 is reversed, the check ball fixing block 120 rotates downwardly about the pivot shaft 124 and the check ball 94 is separated from the block.

At this time, during the forward operation of the operation bar 114, the dart fixing block 118, the fixing groove 118c portion is spaced apart, on the contrary, the check ball fixing block 120 is advanced to maintain a horizontal state, dart 92 It is preferable that the device be configured such that only one of the check balls 94 can be used.

3B and 7, the second and third cooling nozzles 98 and 98 'are respectively provided on the upper side of the lance beam 70 and the inner side of the operation bar 114. By supplying the supply pipes 98a and 98a ', respectively, the coolant W and the air A are injected through the nozzles 98 and 98', which eventually result in the lance beam 70 entering the converter 10. ) And its clamping means 110 at its distal end are cooled to prevent deformation or damage due to high heat.

Next, an essential operation when cutting the slag (S) by the above-described injection method or mechanism method is the movement of the lance beam 70, which will be described in detail as follows.

As shown in FIG. 3A, the movable carriage 50 moves to the tilted guide frame 30, and the lance beam 70 is fixed to the movable carriage 50 so that the lance beam may be moved when the carriage 50 moves. 70 is moved, the carriage (endless type drive chain 54 fixed to the carriage 50 is circulated along the sprocket 52 installed in front and rear of the guide frame 30, the carriage ( 50 moves, and the drive chain 54 can be driven as the drive unit 60.

And, importantly, the carriage 50 is provided with a plurality of guide rolls, that is, guide rolls 56 in the horizontal and vertical directions, so that the upper side of the guide rail 32 protruding in a plate shape on the side of the guide frame 30. , The carriage 50 is moved in the state in which the guide rolls 56 are supported along the lower surface and the side edge surface, so that the carriage 50 and the lower lance beam 70 are stably before and after flow. I can move it.

On the other hand, the drive unit 60 is a drive motor 62 mounted on the rear end fixed block 62a of the guide member 30, a motor sprocket 62b fixed to the motor shaft and the guide member ( 30 is provided with a transfer chain 66 fastened to the main sprocket 66a mounted to the drive shaft 64 to which the drive sprocket 52 mounted.

Therefore, when the drive motor 62 is driven, the sprocket 66a of the drive shaft on which the drive sprocket 52 is installed via the sprocket installed on the drive shaft and the guide sprocket 66a 'provided on the side of the fixed block 62a. The conveying chain 66 coupled to the drive is driven, and the main sprocket 52 installed on the same shaft is driven to move the carriage 50 as the drive chain 54.

On the other hand, as shown in Figure 4, the drive motor 62 is provided with an air drive motor 62 ', which is to provide an emergency drive source, if the lance beam 70 is entered into the converter In the case where the power of the factory is cut off and cannot be drawn out from the converter, the air motor 62 'is operated to urgently escape the converter of the lance beam 70.

Accordingly, according to the present invention, the multi-functional cutting device 1, according to the state of the slag at the time of molten steel for the appropriate cutting means, that is, for the mechanical cutting method such as the dart 92 or the check ball 94 and for the clean work of the molten steel Since the injection method of injecting argon gas (G) including flux powder (F) can be appropriately performed as a single device (1), the outflow of slag is reduced by about 25% compared with the prior art, which effectively prevents slag outflow. To improve the quality of molten steel.

In addition, since the sampler 100 is mounted at the front end of the lance beam 70, when the dart 92 is used without using the check ball 94, the sampling operation of the molten steel may be simultaneously performed.

As described above, according to the present invention, the multifunctional slag cutting device of the converter converts the slag from flowing out during the molten steel of the converter in advance, thereby further improving the quality of the molten steel, and adding dart and check ball and argon gas as one. It can be used as a device, which is more convenient to use and has the advantage of increasing operation efficiency.

In addition, by allowing the lance of the device to be inserted into the converter to be cooled during operation, the life of the device is further extended, and the tilting and linear movement are precisely performed, thereby easily performing the mechanism and the injection operation in the converter and adjusting its position. There is also an excellent precision effect.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (6)

In the device (1) for cutting the outflow of the slag (S) of the molten steel upper layer at the time of tapping the molten steel (M) in the converter 10, A guide member 30 installed to be able to tilt downward of the fixed beam 20 installed adjacent to the converter 10; and A lance member 70 fixed to a lower portion of the moving carriage 50 installed to be movable to the guide member 30; And, It includes a clamping means 110 to be detachably fixed to the plurality of cutting means 90 to block the tapping hole 12 during the molten steel tap of the converter 10 to the front end of the lance member 70 Multifunctional slag cutting device of the converter characterized in that According to claim 1, wherein the guide member 30 is composed of a tilting hinge 22 installed on both sides of the fixed beam 20 and the guide frame of the linear beam fixed to the lower portion of the tilting unit 24 for tilting operation , The moving carriage 50 is fixed to the transfer chain 54 which is rotationally driven along the front and rear drive sprockets 52 of the guide frame as the drive unit 60 mounted to the rear of the guide frame 30. The carriage 50 is installed to move, and a plurality of guide rolls 56 engaged with the guide rail 32 protruding from the side of the guide frame 30 are installed on both sides of the moving carriage 50. Multifunctional slag cutting device 3. The driving unit (60) according to claim 2, wherein the drive unit (60) includes a drive motor (62) mounted on a rear end fixing block (62a) of the guide member (30), a motor sprocket (62b) fixed to the motor shaft, and The drive sprocket 52 mounted on the guide member 30 is provided with a transfer chain 66 fastened to the main sprocket 66a mounted on the fixed drive shaft 64, and the main sprocket 66a according to the motor drive. In the drive of the drive) is configured to rotate the conveying chain 54, the carriage 50 is fixed along the drive sprocket 52, The drive unit 60 is a multi-functional slag cutting device of the converter characterized in that it further comprises an emergency air motor 62 '. According to claim 1, The lance member 70 is formed of a straight beam having a predetermined length so that it can enter through the inlet 14 of the converter 10 so that the rear end is fixed to the lower portion of the moving carriage 50 Become, The clamping means 110 is a main cylinder 112 mounted to the rear end of the guide member 30, the operation bar 114 is connected to the cylinder to extend to the front end through the lance beam 70, and the Multifunctional slag cutting device of the converter, characterized in that consisting of a two-stage clamping block 116 mounted to the front end of the operation bar 114 The method according to claim 1 or 4, wherein the plurality of cutting means 90 is composed of a dart 92 and a check ball 94 for cutting the outflow of the slag (S) of the molten steel upper layer portion, The two-stage clamping block 116 of the clamping means 110, the first dart fixing block 118a through the front end of the operation bar 114 and the second moving forward integrally with the operation bar 114 in front of it. It is formed of a dart fixing block 118b and the dart fixing block 118 to which the dart 92 is detachably fixed, and is connected to the distal end of the operation bar 114 and pivotally connected for rotational movement. Multifunctional slag cutting device of the converter characterized in that it comprises a check ball fixing block 120 is formed integrally with the hook groove (120a) The flux powder (F) according to claim 5, wherein the cutting means (90) is mounted to the front end of the lance member (70) in front of the first supply pipe (96a) installed in a straight line under the lance member (70). Further comprising a spray nozzle (96) for injecting a gas (G) which may be included in the molten steel, The lance member 70 has coolant and air nozzles 98 and 98 for spraying coolant (W) and air (A) to prevent deformation due to heat when the lance member (70) and the clamping means (110) are introduced into the converter. ', Second and third supply pipes (98a, 98a') is installed, One side of the clamping means 110, the multi-functional slag cutting device of the converter characterized in that the sampler 100 for collecting the molten steel sample is further mounted.