KR100237083B1 - exchanger of sediment noggle for injecting melted iran - Google Patents

Abstract

The present invention is a submerged entry nozzle (submerged entry nozzle) for injecting molten steel into the casting mold is mounted to the lower portion of the slide gate (slide gate) to control the amount of molten steel injected into the casting mold (casting mold) It is related to the replacement device so that one person can replace the hot deposition nozzle in a short time.

To this end, the traveling rail 1 installed on the trolley 9 of the molten steel container 8, the traveling part 2 moving along the traveling rail, and the rising and falling movement installed in the traveling part, A lowering part 3, driving means for driving the lifting and lowering part, a rotating part 4 provided on the bottom of the lifting and lowering part, and a slide part coupled to the rotating part to perform a straight line, a reciprocating motion and a turning motion ( 5) and a clamping part 6 provided at the tip of the slide part to handle the deposition nozzle, and an operation part 7 provided on one side of the lifting and lowering part to control the operation of the driving part and the driving means. will be.

Description

Replacement device for immersion nozzle for molten steel injection {exchanger of sediment noggle for injecting melted iran}

The present invention is a submerged entry nozzle (submerged entry nozzle) for injecting molten steel into the casting mold is mounted to the lower portion of the slide gate (slide gate) to control the amount of molten steel injected into the casting mold (casting mold) As a replacement device, more specifically, the hot dip nozzle can be replaced by one operator in a short time.

In general, when molten steel dissolved in a melting furnace is received as a ladle for continuous casting and flowed to a molten steel side, the molten steel in the molten steel slide slides by opening and closing a slide gate installed in the lower portion of the molten steel container. Since it is continuously supplied into the casting mold through the deposition nozzle mounted on the slide gate so as to be located inside the gate and the casting mold, the slab or bloom can be produced by the continuous casting operation.

This continuous casting operation has a limited lifetime because the immersion nozzle is located in a high temperature casting mold, and should be replaced with a new immersion nozzle if damaged.

Conventionally, when a damaged immersion nozzle is to be replaced, the molten steel container is raised by closing the open slide gate and stopping the casting work, and then a worker consisting of a pair of two people uses a high temperature immersion nozzle mounted on the slide gate by hand. Separated.

Thereafter, the preheated new immersion nozzle was mounted on the slide gate, and then the molten steel vessel was lowered to an initial state to resume casting.

However, this conventional deposition nozzle replacement work has the following problems.

First, in order to replace the deposition nozzle, the molten steel container must be raised and lowered. Therefore, the replacement of the deposition nozzle due to the rising and lowering of the molten steel container was delayed. Foundry work became impossible.

Second, as the replacement time of the deposition nozzle is delayed, the temperature of the molten steel in the molten steel drops, resulting in deterioration of the properties and quality of the steel.

Third, since the ambient temperature of the workplace is very high and the preheated immersion nozzle is a high temperature, there is a high possibility that the worker may be injured by carelessness, and the immersion nozzle is heavy and difficult to handle.

Fourth, labor costs are high due to the replacement of immersion nozzles by organizing working people in groups of two.

The present invention has been made in order to solve such a problem in the prior art, the phenomenon that the molten steel in the casting mold is solidified so that one operator can quickly replace the high-temperature deposition nozzle without raising and lowering the molten steel container and The purpose is to prevent the occurrence of safety accidents.

According to an aspect of the present invention for achieving the above object, a running rail provided on a trolley of a molten steel container, a traveling part moving along the traveling rail, and a lifting and lowering part installed in the traveling part to move up and down Drive means for driving the lifting and lowering portions, a rotating portion provided at the bottom of the raising and lowering portions, a slide portion coupled to the rotating portion for linear, reciprocating and turning movements, and a tip of the slide portion. There is provided an apparatus for replacing molten steel injection nozzles comprising a clamping part for handling a deposition nozzle and an operation part installed on one side of the lift and lower parts to control the operation of the driving part and the driving means.

1 is a perspective view of the present invention

2 is a front view of a state in which the present invention is installed

3 is a side view of FIG. 2

Figure 4 is a side view of the deposition nozzle is mounted on the hanger of the slide gate

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view taken along the line B-B of FIG.

7A to 7F are state diagrams for explaining the operation of the present invention.

7A is a plan view horizontally moved to the deposition nozzle to be replaced in the initial state

7B is a front view with raised clamping part;

7C is a side view of the clamp in close contact with the deposition nozzle by rotating the clamping unit;

FIG. 7D is a side view of pivoting the dip nozzle clamped to the clamping portion by rotating the handle 90 °

FIG. 7E is a front view of the immersion nozzle separated from the slide gate in the waste container

7F is a plan view of a state in which the immersion nozzle preheated in the preheating part is clamped and moved to a mounting position;

Explanation of symbols for main parts of the drawings

1: running rail 2: running part

3: up and down 4: rotation

5 slide part 6 clamping part

7: control panel 11,11a: immersion nozzle

12: conveying body 14: electric motor

19: auxiliary roller 20: guide rail

21: the first link 25: the second link

28: third link 32: support

34: air cylinder 39: rotating body

40: sleeve 41: shifting shaft

42: handle 49: fixed clamp

52: movable clamp 54: operation button

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 7F.

1 is a perspective view showing the present invention, Figure 2 is a front view of the state in which the present invention is installed, Figure 3 is a side view of Figure 2, the present invention is a running rail (1), the running portion (2), lifting, lowering (3), the drive means, the rotating part 4, the slide part 5, the clamping part 6, the operation part 7, etc. are comprised.

The traveling rail 1 provided on the trolley | bogie 9 of the molten steel container 8 is installed so that it may extend even between the some slide gate 10 provided in the molten steel container 8, as shown in FIG.

This is to make it possible to selectively replace the plurality of immersion nozzles 11 mounted on the molten steel container 8 by using the apparatus of the present invention.

As shown in FIGS. 1 to 3, the traveling part 2 moving along the traveling rail 1 is installed to enclose the traveling rail 1 and rotates in the horizontally moving conveying body 12 and the conveying body. A plurality of wheels 13 coupled to the upper surface of the running rail, which are coupled to each other, and rolling on the moving rails, an electric motor 14 installed on the conveying body to generate rotational force on the wheels, and a power transmission to transmit the rotational force of the motor to the wheels Configure by means.

As shown in FIG. 1, the power transmission means includes a spur gear 15 fixed to a shaft of the electric motor 14 and a spur gear fixed to one of the plurality of wheels 13 and engaged with the spur gear. It consists of a purge gear 16.

At this time, in order to smoothly move the conveying body 12 in the present invention, the bolts and nuts (not shown) in the fastening hole 17 formed on both sides of the conveying body 12 on the inner side of the conveying body, respectively. And an auxiliary roller 19 for rolling in contact with the bottom of the traveling rail 1 on each support piece.

The support piece 18 forms a fastening hole 17 fixed with a bolt and a nut perpendicularly to the conveying body 12.

This is to allow the auxiliary roller 19 installed on the support piece 18 to adjust the position of the auxiliary roller 19 so that the auxiliary roller 19 always contacts the bottom of the running rail 1.

The lifter and lowerer part 3, which is installed on the carrier 12 and lifts and lowers the rotating part 4, the slide part 5, the clamping part 6, and the operation part 7, is the bottom surface of the carrier body 12. A guide rail 20 fixed to the guide rail, a pair of first links 21 horizontally coupled to the guide rails, and a guide rail 20 rotatably installed at one end of the first link. A roller 22 mounted on the pair of pairs of second links 25 which are mutually coupled to the first link and the shaft 23 and one end of which is hinged to the transfer body 12 by a pin 24; A third link 28 hinged to one end of each of the first and second links 21 and 25 by a pin 26 and coupled to the third link 28 by an intermediate portion coupled to the shaft 27. The support 32 is formed with a vertical long hole 29 into which the shaft 27 is fitted and a horizontal long hole 31 into which the pin 30 fixed to the lower part is fitted.

As shown in FIGS. 2 and 5, the driving means for driving the lifting and lowering portions is an air cylinder 34 which is rotatably installed around the pin 33 on the conveying member 12 and the first link 21. The cross bar 35 is fixed between the rods 34a of the air cylinder and hinged to the support piece 36 of the cross bar.

The rotating part 4 which allows the slide part 5 to rotate from the support part 32 is comprised by the housing 37 fixed to the support part 32, and the rotating shaft 38 rotatably installed in the said housing.

The slide unit 5 includes a rotating body 39 fixed to the rotating shaft 38 of the rotating unit, a sleeve 40 coupled to the rotating body so as to be rotatable up and down, and rotatable and retractable to the sleeve. It consists of a shifting shaft 41 and a handle 42 fixed to one end of the shifting shaft.

At this time, bellows 43 is provided on both sides of the sleeve 40, respectively.

This prevents the lubricant oil injected into the friction surface of the sleeve and the shifting shaft from leaking to the outside so that the shifting shaft 41 smoothly moves in the sleeve 40, and at the same time, the friction surface thereof is contaminated from the outside. To prevent this in advance.

Since the sleeve 40 is rotatably installed on the rotating body 39, the range of the slide unit 5 and the clamping part 6 is unbalanced so as not to rotate arbitrarily when the center of gravity is imbalanced. The guide housing 44 is rotatably installed at one end of the rotating body 39, and the bolt 40 fitted to the guide housing 44 is rotatably coupled to the sleeve 40. Nuts 62a and 62b are screwed to the upper and lower bolts, respectively, so that the amount of rise and fall of the sleeve 40 is controlled.

That is, by adjusting the nut (62a) located in the upper portion so that the shifting shaft 41 is horizontal by the weight of the clamping portion (6), the nut (62b) located in the lower portion of the guide housing 44 The amount of rotation of the shifting shaft 41 is determined by adjusting the bottom and the gap.

In addition, the damper housing 46 can be rotated on one side of the rotating body 39 to minimize the impact on the sleeve 40 even when the sleeve 40 is rotated up and down with a small force and the external force is removed. The damper member 47 coupled to the damper housing is elastically installed to the sleeve 40 by a spring 48.

In addition, the clamping part 6 for clamping the high temperature deposition nozzle 11 includes a fixed clamp 49 fixed to the tip of the shifting shaft 41 and a rod 50 removably installed in the shifting shaft. And a movable clamp 52 which is fixed to the tip of the rod and moves forward and backward as the cylinder 51 is driven.

The operation unit 7 for controlling the operation of the present invention is configured by installing a plurality of operation buttons 54 on the operation panel 53 fixed to the support 32 as shown in Figs.

Referring to the operation of the present invention configured as described above is as follows.

First, when the deposition nozzle 11 is mounted on the slide gate 10 in order to perform a continuous casting operation, as shown in FIGS. 3 and 4, the holders 55 fixed to both sides of the deposition nozzle 11 are hangers ( It fits in the concave groove 56a of 56, and the upper surface of the immersion nozzle is kept in close contact with the bottom surface of the slide gate by locking means (not shown).

At this time, the apparatus of the present invention stands by at the intermediate position of the traveling rail 1 as shown in Fig. 7A.

In this state, if the immersion nozzle 11 installed is damaged while replacing it with a new immersion nozzle, the locking state of the immersion nozzle mounted on the slide gate 10 must be released by the locking means. .

Even when the locking means of the immersion nozzle 11 is released in this manner, as shown in FIG. 4, since the holder 55 fixed to both sides of the immersion nozzle is placed in the concave groove 56a of the hanger 56, the slide gate 10 is removed from the slide gate 10. The deposition nozzle 11 is not detached.

When the operator presses the operation button 54 of the operation unit 7 to drive the electric motor 14 installed in the conveying body in a state in which the conveying body 12 is positioned in the middle of the traveling rail 1 as shown in FIG. 7A. Since the motor is powered and driven, the motor shaft starts to rotate.

Accordingly, since the rotational force according to the driving of the electric motor is transmitted to the wheels 13 on one side through the spur gears 15 and 16 meshed with each other, the wheels are rotated so that the transfer nozzles 11 to replace the transfer body 12 are replaced. At this time, the auxiliary roller 19 fixed to the conveying body 12 is in close contact with the bottom of the traveling rail 1 so that the conveying body 12 is stably moved along the traveling rail 1 without shaking. .

When the operator removes the external force from the operation button 54 held down while the conveying member 12 is moved to a desired position (a position where the clamping portion is close to the deposition nozzle), the supply of power applied to the electric motor 14 is stopped. The movement of the conveying body is stopped.

In this way, after the transfer member 12 is completed moving toward the deposition nozzle 11, the shifting shaft 41 inserted into the sleeve 40 is advanced while the worker grasps the handle 42 of the slide portion 5. In this case, the amount of advancing the shifting shaft 41 is a point where the line between the center of the clamping portion 6 fixed to the tip and the center of the deposition nozzle 11 is parallel to the running rail 1, that is, FIG. 7A. The shifting shaft 41 is advanced to the point indicated by the dashed-dotted line at.

As described above, when the clamping portion 6 is moved toward the deposition nozzle 11 to separate the deposition nozzle 11, the movable clamp 52 is opened from the fixed clamp 49.

Subsequently, when the air cylinder 34 is driven by pressing the operation button 54 of the operation unit 7, the rod 34a of the air cylinder, which has been advanced, is pulled, so that the first, second, third links 21, 25 ( 28) is folded together as shown in FIG. 7B.

That is, when the rod 34a of the air cylinder is pulled, one end of the second link 25 is hinged to the conveying member 12, and one end of the first link 21 is movable to the guide rail 20. The cross bar 35 fixed between the first links is hinged to the rod 34a by the support piece 36 so that the roller 22 coupled to the first link 21 is guide rail. Since the first, second, and third links 21, 25, and 28 are folded together along the 20, the support 32 installed below the third link 28 is folded. Is raised.

As such, when the first, second, and third links 21, 25, 28 are folded together, the shaft 27 fitted into the vertical long hole 29 of the support 32 moves to the lower portion of the vertical long hole, and the horizontal long hole ( The pin 30 fitted to 31 is moved outward.

When the clamping portion 6 installed on the shifting shaft 41 reaches the same horizontal line as the immersion nozzle 11 by raising the support 32 in the operation as described above, the external force is removed from the operation button 54 to support the support. The rise of 32 is stopped.

If the clamping part 6 is not located on the immersion nozzle 11 and the horizontal line, the operation button 54 is pressed to finely adjust the lifting and lowering amount of the support 32 to readjust the position of the clamping part.

If it is determined by the operator that the clamping portion 6 is positioned on the same horizontal line as the immersion nozzle 11, the power is applied to the motor 14 of the traveling portion to move the conveying member 12 horizontally to the immersion nozzle 11 again. The clamping part 6 is connected to the clamping part of the immersion nozzle 11.

When the clamping part 6 is connected to the clamping part of the immersion nozzle 11 as described above, the external force is removed from the operation button 54 held down so that the movement of the conveying body 12 is stopped. Even if the external force is removed from the operation button 54 in a state in which the nozzle 11 is slightly transferred to the nozzle 11, the rotating body 39 supporting the slide unit 5 is rotated about the rotating shaft 38 so that the clamping unit 6 The phenomenon of being hit by the deposition nozzle 11 and being damaged is prevented in advance.

As described above, when the clamping portion 6 is connected to the clamping portion of the immersion nozzle 11, the immersion nozzle 11 is rotated by rotating the rotating body 39 supporting the clamping portion without horizontally conveying the conveying member 12. It is possible to connect the clamping part 6 over the clamping part of.

However, in this case, the clamping portion 6 and the deposition nozzle 11 should be adjusted to adjust the position of the clamping portion 6 so as to be positioned within the same rotation radius about the rotating shaft 38.

As such, when the clamping part 6 is connected to the clamping part of the immersion nozzle 11, it is obvious that the clamping part should be kept fully open.

When the clamping part 6 is connected to the clamping part of the immersion nozzle 11, the operator presses the operation button 54 of the operation part 7 to operate the cylinder 51 installed in the handle 42. Since the rod 50 of the 51 is pulled, the movable clamp 52 opened from the fixed clamp 49 moves to the fixed clamp side and clamps the deposition nozzle 11 as shown in FIG. 7C.

In this state, the clamping part 6 is rotated about the axis 58 by slightly pressing the knob 42 in the direction of the arrow shown in FIG. 3 while the clamping part 11 is to be separated. Done.

As a result, as shown in FIG. 4, the holder 55 of the deposition nozzle 11 mounted in the concave groove 56a of the hanger 56 is lifted up from the concave groove, and the operator rotates the handle 42 by 90 °. As shown in FIG. 7D, the lower part of the deposition nozzle 11 located in the casting mold 59 exits from the deposition nozzle insertion hole 59a of the casting mold, so that the deposition nozzle 11 can be separated.

When the immersion nozzle 11 is detached from the slide gate 10 and the external force is removed from the handle 42, the damper member 47 compresses the spring 48 installed in the damper housing 46 to absorb the shock. Therefore, the clamping part 6 is prevented from falling sharply.

In this state, the conveying member 12 is conveyed in the opposite direction (recovery cylinder side) described above, and then the support 32, which has been raised, is lowered as in the initial state by operating the lifting and lowering unit 3.

Thereafter, the handle 42 is pulled or rotated to adjust the deposition nozzle 11 clamped to the clamping part 6 so as to be positioned directly above the recovery container 60, and then the rod 50 of the cylinder 51 is adjusted. By advancing, the clamping state of the deposition nozzle 11 is released, so that the hot deposition nozzle is recovered in the recovery container as shown in FIG. 7E.

After removing the immersion nozzle 11 installed at the bottom of the molten steel container 8 by the operation as described above and recovering the immersion nozzle 11 in the recovery container 60, a new immersion nozzle preheated at the preheating position 61 as shown in FIG. 7F. Should be clamped.

Accordingly, the operator clamps the clamping part 6 by adjusting the clamping part 6 and the immersion nozzle to be located within the same rotation radius by moving the shifting shaft 41 forward, backward or turning while holding the handle 42. Make contact with the clamping part of the nozzle.

Then, as described above, the cylinder 51 is driven in the reverse order to pull the movable clamp 52 toward the fixed clamp 49 to clamp the new immersion nozzle, and then rotate the shifting shaft 41 to the state as shown in FIG. 7A. At the same time, turn 90 ° to keep the deposition nozzle horizontal.

As such, when the immersion nozzle maintains the horizontal state, the motor 14 is driven to transfer the conveying member 12 to the vicinity of the slide gate 10, and then the air cylinder 34 is driven to raise the support 32. .

After the ascending of the support 32 is completed, the operator moves the handle 42 forward, backward, or pivots so that the holder 55 of the immersion nozzle is adjusted close to the concave groove 56a of the hanger 56. When the knob 42 is rotated by 90 ° while being pressed in the direction of the arrow shown in FIG. 3 to maintain the deposition nozzle in a vertical state, the holder 55 of the deposition nozzle is placed directly above the concave groove 56a of the hanger 56. In this state, when the external force is removed from the handle 42 which is applying the force, the holder 55 of the immersion nozzle is inserted into the recessed groove 56a of the hanger 56.

In this way, even if the external force is removed from the handle 42, the damper member 47 compresses the spring 48 installed in the damper housing 46, thereby absorbing the shock, thereby preventing the clamping portion 6 from falling sharply. .

In this state, the cylinder 51 is driven to advance the movable clamp 52 to release the clamping state of the deposition nozzle, and at the same time, the motor 14 is driven to reduce the conveying body 12 to the initial state, thereby depositing the nozzle. Will be replaced.

As described above, the present invention has the following advantages.

First, since the molten steel container does not have to be raised or lowered during the replacement of the immersion nozzle, it is possible to quickly replace the immersion nozzle.Therefore, there is no risk of solidification of the molten steel that has already been injected into the casting mold. do.

Secondly, as the replacement time of the immersion nozzle is reduced, the phenomenon of falling the temperature of the molten steel in the molten steel container is prevented in advance, so that the quality and quality of the steel are not deteriorated, thereby obtaining a high quality product.

Third, the replacement operation is performed while the high temperature immersion nozzle is clamped by the clamping part, so that the worker is not burned by the equipment and the preheated immersion nozzle of the work place where the temperature is very high. Handling becomes easy.

Fourth, expensive labor costs are reduced because one worker can replace the deposition nozzle.

Claims (16)

The running rail 1 provided on the trolley 9 of the molten steel container 8, the traveling part 2 moving along the traveling rail, and the lifting and lowering part installed on the traveling part to move up and down ( 3), drive means for driving the lift and lower portions, a rotary portion 4 installed on the bottom of the lift and lower portions, a slide portion 5 coupled to the rotary portion for linear, reciprocating and pivoting movements; And a clamping part 6 installed at the tip of the slide part to handle the deposition nozzle, and an operation part 7 installed at one side of the lifting and lowering part to control the operation of the driving part and the driving means. Replacement device. The method of claim 1, A device for replacing a molten steel injection nozzle provided with a running rail (1) extending between a plurality of slide gates (10) installed in a molten steel container (8). The method of claim 1, The traveling part 2 is installed to surround the traveling rail 1, and the conveying body 12 to move horizontally, and the plurality of wheels 13 are rotatably coupled to the conveying body mounted on the upper surface of the running rail to move the clouds And an electric motor (14) installed in the conveying member to generate rotational force on the wheels, and a molten steel injection deposition nozzle provided as a power transmission means for transmitting the rotational force of the electric motor to the wheels. The method of claim 3, wherein The power transmission means includes a spur gear 15 fixed to a shaft of an electric motor, and a sputter gear 16 fixed to any one of the plurality of wheels, the spur gear 16 being installed to mesh with the spur gear. Replacement device. The method of claim 3, wherein An auxiliary roller for fixing the support piece 18 to the fastening hole 17 formed on both sides of the inner surface of the conveying body 12 by bolts and nuts and contacting the bottom surface of the traveling rail 1 to the support rollers. 19) Replacement device for immersion nozzle for molten steel injection. The method of claim 5, A device for replacing molten steel injection nozzles, in which a fastening hole 17 for fixing the support piece 18 to the conveying body 12 is vertically long. The method of claim 1, The lifting and lowering portion 3 includes a guide rail 20 fixed to the bottom surface of the conveying body 12, a pair of first links 21 horizontally coupled to the guide rail, and the first rail. A pair of second links 25 coupled to each other by a first link and a shaft 23 and one end of which is hinged to the conveying body 12, and one end of the first and second links 21 and 25, respectively. A third link 28 coupled to the middle portion of the shaft 27, a vertical hole 29 to which the shaft 27 coupled to the third link 28 is coupled, and a pin 30 fixed to the lower portion thereof. The apparatus for replacing a molten steel injection nozzle consisting of a support 32 formed with a horizontal long hole 31 is coupled to). The method of claim 7, wherein The driving means is an air cylinder 34 which is rotatably installed around the pin 33 on the conveying body 12 and the cross bar 35 is fixed between the first links 21 to load the air cylinder ( A device for replacing molten steel injection nozzles, which is hinged to a support piece 36 of a cross bar 35. The method of claim 1, Rotating portion (4) is a replacement device for the molten steel injection nozzle consisting of a housing (37) fixed to the support (32) and a rotating shaft (38) rotatably installed in the housing. The method of claim 1, The slide unit 5 includes a rotating body 39 fixed to the rotating shaft 38 of the rotating unit, a sleeve 40 coupled to the rotating body so as to be rotatable up and down, and rotatable and retractable to the sleeve. Combined shifting shaft 41 and the replacement device for the molten steel injection nozzle consisting of a handle (42) fixed to one end of the shifting shaft. The method of claim 10, Replacement device for immersion nozzles for molten steel injection, each having a bellows (43) installed on both sides of the sleeve (40). The method of claim 10, A damper housing 46 is rotatably installed on one side of the rotor 39, and a damper member 47 coupled to the damper housing is elastically installed with a spring 48 in the sleeve 40. Replacement device. The method of claim 10, The guide housing 44 is rotatably installed at the other end of the rotating body 39, and the bolt 45 fitted to the guide housing 44 is rotatably coupled to the sleeve 40 so that a pair of nuts ( 62a) (62b) is a replacement device for the molten steel injection nozzle configured to control the rise and fall of the sleeve. The method of claim 10, The damper housing 46 is rotatably installed on one side of the rotor 39, and the damper member 47 coupled to the damper housing is elastically installed by the spring 48 and the rotor ( The other side of the guide 39, the guide housing 44 is rotatably installed, the sleeve 40, the bolt 45 fitted to the guide housing 44 is rotatably coupled to a pair of nuts (62a) ( 62b) to replace the molten steel injection nozzle configured to control the rise and fall of the sleeve. The method of claim 1, The clamping part 6 includes a fixed clamp 49 fixed to the tip of the shifting shaft 41, a rod 50 installed in the shifting shaft in a retractable manner, and a cylinder fixed to the tip of the rod. 51. A molten steel injection immersion nozzle replacement device including a movable clamp 52 that moves forward and backward in accordance with the driving of 51). The method of claim 1, The operation unit 7 is a replacement device for the molten steel injection deposition nozzles by installing a plurality of operation buttons 54 on the operation panel 53 fixed to the support (32).

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