JPH0819837A - Device for attaching/detaching nozzle for molten metal - Google Patents

Abstract

PURPOSE:To facilitate the attachment/detachment of a nozzle to/from a steel tapping hole of a molten metal vessel by arranging a swinging device on a truck, transporting mechanism composed of a multistep type extending arm on the swinging device so as to be freely swung, further, a delivery device at the tip part of the extending arm at the uppermost step of the transporting mechanism. CONSTITUTION:At the time of working, the nozzle 7 preheated in a preheating furnace 46 is held up to a prescribed height and received with the delivery device 14 of the transporting mechanism 13. The delivery device 14 of the transporting mechanism 13 receiving the nozzle 7 is shifted to the reverse side of the pre-heating furnace 46 by once shrinking the three-step type elevating arm 17, 18, 19 and also, rotating at 180 angle with the swing device 12. Then, a joint filler 45 is stuck onto the upper surface of a nozzle 7 by working a joint filler supplying and press-sticking device 15. Successively, the delivery device 14 of the transporting mechanism 13 is again extended, and after positioning a nozzle holding device 36 of the molten metal vessel 1, the nozzle 7 supported with an engaging groove of a delivery hand 28 is transfered to the nozzle holding device 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for attaching and detaching a nozzle for molten metal, and more particularly to a molten metal for facilitating centering when attaching and detaching a nozzle installed at a tap hole of a molten metal container. The present invention relates to a device for attaching and detaching a nozzle.

[0002]

2. Description of the Related Art Generally, in a continuous casting process in a steelmaking method, a molten metal outlet is provided at the bottom of a molten metal container, and this molten steel outlet controls the amount of molten metal tapped. The slide gate plate and the nozzle for molten metal are installed.

As for the structure of the molten metal container, for example, as shown in FIG. 9, a lining brick 3 is attached to the inside of the container body 2, and in the vicinity of the tap hole where molten metal is tapped,
A molten metal container 1 is constructed by installing a brick 4. Then, the upper nozzle 5 is assembled in the mounting hole formed in this brick 4, and the molten metal nozzle 7 is provided below the upper nozzle 5 via the slide gate plate 6 for controlling the amount of molten metal tapped. is set up.

The molten metal nozzle 7 is formed of a material having a high heat resistance and corrosion resistance and a diameter that does not change. The nozzle 7 is provided at the base end of the nozzle 7 so that a robot or a special exchange device can be easily attached and detached. A nozzle with a holder in which a holder 9 having a rod or an arm 8 projecting in the left-right direction is installed is the mainstream.

Conventionally, the nozzle installed at the tap hole of the molten metal container is replaced with a new nozzle immediately after the completion of all the pouring in the casting process, and when replacing the nozzle, another nozzle is previously prepared. After sticking the joint material on the upper surface of the nozzle that has been preheated by the preheating device, the operator either takes them out one by one and attaches them to the tap hole of the metal container, or inserts the joint material into the tap hole of the metal container. After installing the nozzle, several nozzles were used to preheat the nozzle.

[0006]

However, the used nozzle removed from the molten metal container is in a high temperature state immediately after use, and the new nozzle to be replaced is also preheated and has a large diameter. Since the weight of the nozzle is heavy, it is necessary to remove the nozzle and dispose of the used nozzle.
Due to heavy work in a high-temperature atmosphere, work efficiency is lowered, and there is a problem that the danger is extremely high.

In addition, when the nozzle is attached to the tap hole of the metal container through the joint material and then the nozzle is preheated by several burners, the worker is required to attach the nozzle to the bottom of the molten metal container. There is a problem that not only is there a high risk of having to go in and work, but there is also the problem that only the local area can be preheated because it is preheated by the burner after the nozzle is installed.

The present invention has been made to solve the above-mentioned conventional problems, and facilitates the attachment and detachment of the nozzle installed at the tap hole of the molten metal container and preheats the nozzle to be replaced in advance. It is another object of the present invention to provide an apparatus for attaching and detaching a nozzle for molten metal, which facilitates centering when attaching this.

[0009]

In order to achieve such an object, the apparatus for supplying a nozzle for molten metal according to the present invention comprises a swivel device installed on a trolley and a swivel device 180 ° on the swivel device. A transport mechanism consisting of a multi-stage telescopic arm that is freely installed, a nozzle delivery device installed at the tip of the topmost telescopic arm of the transport mechanism, and a nozzle that is installed at a predetermined position on the trolley and on the upper surface of the nozzle. It is composed of a joint material supply / compression device for pasting sheet-like joint material, and a stocker section for storing a large number of joint materials.

The transport mechanism preferably comprises a three-stage telescopic arm. In that case, in the carrying mechanism, the first telescopic arm, the second telescopic arm and the third telescopic arm are connected in three stages upward via the first cylinder, the second cylinder and the third cylinder, respectively. Is configured so that each telescopic arm can be telescopically extended in the forward direction, and the delivery device for the nozzle is the third uppermost stage.
A lower base that is installed at the tip of the telescopic arm and is engaged with two rails that are fixed in the front-rear direction on the third telescopic arm via sliders, and is fixed in the left-right direction on the lower base. And an upper base engaged with two rails via a slider, and a nozzle hand which is vertically movably installed on a piston rod of a vertical lifting cylinder fixed to the upper base. is there.

Further, in order to achieve the above object, a copying apparatus installed on the carriage so as to be movable in the front-rear direction and the left-right direction, a nozzle preheating apparatus installed on the upper surface of the copying apparatus, and a preheating apparatus in parallel with each other. A waste pot that stores the used nozzle installed in the, a power cylinder for raising and lowering the nozzle that is installed on the side of the preheating device and mounts the nozzle, and a used nozzle that is installed and removed on the side of the waste pot. To the waste pot, a power cylinder for raising and lowering the waste nozzle, a power cylinder for raising and lowering the nozzle and a power cylinder for raising and lowering the power cylinder for raising and lowering the waste nozzle, and a nozzle mounting part after removal And a power cylinder for moving the drill up and down to move the cutting drill up and down.

In the attaching / detaching device, a delivery hand for engaging arms protruding from a holder of the nozzle is attached to the upper ends of the power cylinder for raising and lowering the nozzle and the power cylinder for raising and lowering the waste nozzle.
Set the power cylinder for raising and lowering each nozzle and the power cylinder for raising and lowering the waste nozzle at a predetermined position. Attach a positioning pin to the positioning block attached to the bottom of the molten metal container at the upper end of the power cylinder for raising and lowering. ,
The cutting drill attached to the tip of the power cylinder for raising and lowering the drill is configured to be rotationally driven by a drill driving motor.

[0013]

As described above, according to the apparatus for attaching and detaching the nozzle for molten metal according to the present invention, the nozzle preheated in the preheating furnace can be easily installed in the tap hole of the molten metal container, and the nozzle can be easily installed. Centering can be facilitated.

Therefore, according to the present invention, since the nozzles can be attached / detached by the automated attachment / detachment device without manual labor for heavy work in a high temperature atmosphere even in a high temperature state, the work efficiency is improved and the nozzle attachment / detachment is improved. The centering work at the time can be easily performed.

[0015]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic front view showing a molten metal nozzle attaching / detaching device according to a first embodiment of the present invention, and FIG. 2 is a plan view of FIG. 1, in which a molten metal nozzle attaching / detaching device 10 is shown. Is a turning device 12 installed on a dolly 11,
A carrier mechanism 13 composed of a three-stage telescopic arm installed on the swivel device 12 so as to be rotatable 180 degrees, a nozzle delivery device 14 installed at the tip of the uppermost telescopic arm of the carrier mechanism 13, and a cart. A joint material supply which is installed at a predetermined position above 11 and sticks a sheet-like joint material on the upper surface of the nozzle.
It is composed of a crimping device 15 and a stocker portion 16 for accumulating and storing a large number of joint materials.

In the carrying mechanism 13, the first telescopic arm 17 is rotated by 180 degrees by the turning device 12, and the second telescopic arm 18 and the third telescopic arm 19 are moved upward via the first cylinder 20 and the second cylinder 21, respectively. Are connected to each other in three stages, and when the cylinders 20 and 21 are operated, the expandable arms 18 and 19 can expand and contract in the forward direction.

The nozzle delivery device 14 is the third uppermost stage.
As shown in FIG. 3, the lower end of the telescopic arm 19 is engaged with two rails 23 fixed in the front-rear direction on the third telescopic arm 19 via a slider 24a. The base 24, the upper base 26 engaged with the two rails 25 fixed on the lower base 24 in the left-right direction via the slider 26 a, and the vertical lifting cylinder 27 fixed to the upper base 26. The piston rod 27a is provided with a nozzle delivery hand 28 that is vertically movable.

At the rear end portion of the lower base 24 for moving the delivery device 14 in the front-rear direction, the piston rod 2 of the front-rear movement cylinder 29 fixed to the third telescopic arm 19 is provided.
9a is installed, and when the forward / backward moving cylinder 29 is retracted and the delivery device 14 is returned to the origin position, the origin positioning pin 30 projecting from the rear end of the upper base 26 is installed on the third telescopic arm 19. It is possible to return to the origin by engaging with the positioning block 31.

The piston rod 32a of the balance cylinder 32, which is fixed to the lower base 24 and expands and contracts in the vertical direction, has a slider 33 which moves along a vertical rail.
The bracket 34 having the above is installed, and two positioning pins 35 parallel to the horizontal plane are provided on the upper end portion of the bracket 34 so as to project forward.

The positioning pin 35 installed on the bracket 34 which moves up and down by the balance cylinder 32 and moves back and forth by the forward and backward moving cylinder 29 is fitted to the positioning block 1a mounted on the bottom of the molten metal container 1. As a result, the mounting position of the nozzle 7 is determined.

At the tip of the delivery hand 28 of the nozzle,
An engagement groove with which the arm 8 of the nozzle 7 is engaged is formed, and the telescopic arms 17, 18 and 19 of the transport mechanism 13 are moved forward in the nozzle 7 supported by the engagement groove of the delivery hand 28. The molten metal container 1 is transferred to a nozzle holding device 36 installed at the bottom.

The joint material supply / compression bonding device 15 is installed at the tip of an arm 38 which can be rotated 90 degrees in the horizontal direction by a rotary actuator 37, and as shown in FIG. Operating plate 40
And a vacuum device 4 which is installed on the operating plate 40 by a coil spring 41 so as to be movable up and down and has a suction pad 42 at its tip.
3 and a joint holding plate 44 installed on the shaft portion of the vacuum device 43 by the coil spring 41 so that the vertical movement is balanced.

When the joint material supplying / pressing device 15 moves to the upper surface of the stocker portion 16 storing the joint material 45 made of sheet-like mortar, the cylinder 39 descends and the vacuum device 43 installed on the operating plate 40. Due to the vacuum suction of the suction pad 42,
The cylinders 39 are lifted up and the arms 38 are rotated 90 degrees, and the transfer device 1 of the carrier device 13
It is moved to the upper surface of the nozzle 7 locked by the nozzle 4.

When the joint material supply / compression bonding device 15 reaches the upper surface of the nozzle 7, the cylinder 39 descends to attach the joint material 45 to the upper surface of the nozzle 7, and the cylinder 39 further descends, so that FIG. As shown, the joint holding plate 44 presses the joint material 45 against the upper surface of the nozzle 7 and pressure-bonds it. Then, when the pressure bonding of the joint material 45 is completed, the cylinder 39 moves up to rotate the arm 38 by 90 degrees and return to the original position.

On the other hand, a preheating furnace 46 for preheating a new nozzle 7 to be replaced is installed on the opposite side of the molten metal container 1 with respect to the transport mechanism 13. The preheating furnace 46 moves up and down on the side surface. A free lifting cylinder 47 is installed. A U-shaped hand 48 is provided on the upper end of the lifting cylinder 47.
Is provided, and the nozzle 7 is inserted into the preheating furnace 46 in a state where the arm portion 8 of the nozzle 7 is locked to the hand 48. The nozzle 7 that has been preheated by the preheating furnace 46 is lifted to a predetermined height by the operation of the elevating cylinder 47, and is received by the delivery device 14 of the transport mechanism 13.

Based on such a configuration, during operation, the nozzle 7 preheated in the preheating furnace 46 is lifted to a predetermined height and is received by the delivery device 14 of the carrying mechanism 13. At this time, the delivery hand 28 of the delivery device 14 reliably receives the nozzle 7 locked by the hand 48 of the preheating furnace 46 by operating the three-stage telescopic arms 17, 18, 19 and the vertical lifting cylinder 27. .

In the delivery device 14 of the transport mechanism 13 that has received the nozzle 7, the three-stage lifting arms 17, 18 and 19 contract once, and the swivel device 12 rotates 180 degrees to move to the opposite side of the preheating furnace 46. . Then, the joint material supply / compression bonding device 15 is activated and the joint material 45 is attached to the upper surface of the nozzle 7.
Paste.

Next, after the delivery device 14 of the carrying mechanism 13 is extended again and the nozzle holding device 36 of the molten metal container 1 is positioned, the nozzle 7 supported by the engaging groove of the delivery hand 29 is held by the nozzle holding device. It is transferred to 36.

FIG. 6 is a front view showing a schematic structure of a device for attaching and detaching a molten metal nozzle according to a second embodiment of the present invention, FIG. 7 is a side view of FIG. 6, and FIG. 8 is a plan view of FIG.

The molten metal nozzle attachment / detachment device 50 includes a copying device 52 installed on the carriage 51 so as to be movable in the front-rear and left-right directions, and a nozzle preheating device 53 installed on the upper surface of the copying device 52. A waste pot 54 for accommodating used nozzles installed in parallel with the preheating device 53, and the preheating device 5
Nozzle lifting power cylinder 55 installed on the side of No. 3 and mounting a nozzle, and a waste nozzle lifting power cylinder installed on the side of the waste pot 54 to pass the removed used nozzle to the waste pot 56, a pin lifting power cylinder 57 that positions the nozzle lifting power cylinder 55 and the waste nozzle lifting power cylinder 56 when the nozzle is attached and detached, and a cutting drill 58 that cuts the nozzle mounting portion after removal. And a power cylinder 59 for raising and lowering the drill.

At the upper ends of the power cylinder 55 for raising and lowering the nozzle for attaching and detaching the nozzle and the power cylinder 56 for raising and lowering the waste nozzle, the hand-over hands 60, 61 for locking the arms 8 projecting from the holder 9 of the nozzle 7, respectively. The power cylinder 55 for raising and lowering each nozzle and the power cylinder 56 for raising and lowering the waste nozzle are set at predetermined positions. The upper and lower ends of the power cylinder 57 for raising and lowering the pins are positioned on the bottom of the molten metal container 1. A positioning pin 62 fitted to the block 1a is attached. The cutting drill 58 attached to the tip of the power cylinder 59 for lifting and lowering the drill is driven to rotate by a drill driving motor (not shown).

The operation when the nozzle is attached and detached will be described based on such a configuration. First, the operation of the nozzle attachment / detachment device 50 is almost automatically controlled by a computer, and the copying device 52 installed on the dolly 51 moves back and forth and left and right in response to the operation of each part, and the molten metal container 1 The tap hole is set at a predetermined position.

Therefore, when the nozzle is to be removed, the attaching / detaching device 50 is moved to a position below the tap hole of the molten metal container 1 and stopped, and then the copying device 52 on the carriage 51 is controlled to move the pin up / down power cylinder. 57 rises, is fitted into the positioning block 1a attached to the bottom of the molten metal container 1, and the position of the power cylinder 56 for raising and lowering the waste nozzle is set.

Next, the nozzle holding portion 1b installed at the tap hole of the molten metal container 1 is opened, the power cylinder 56 for raising and lowering the waste nozzle rises, the delivery hand 61 receives the nozzle 7, and the waste hand is discarded. The power cylinder 56 for raising and lowering the disposal nozzle descends and is stored in the disposal pot 54 while holding the nozzle 7 in the delivery hand 61.

When the nozzle is mounted, the new nozzle 7 to be replaced is inserted into the furnace of the preheating device 53 and heated while being held by the delivery hand 60 of the nozzle lifting power cylinder 55. At this time, the power cylinder 59 for raising and lowering the drill is raised, and the nozzle mounting portion removed from the tap hole of the molten metal container 1 is cut by the cutting drill 58 to form a predetermined mounting dimension.

After the nozzle mounting portion of the molten metal container 1 is cut, the molten metal container 1 is raised while holding the nozzle 7 in the delivery hand 60 of the power cylinder 55 for raising and lowering the nozzle.
The nozzle 7 is transferred to the nozzle holding portion 1b which is open to the tapping opening of the nozzle, and the nozzle lifting power cylinder 5
5 goes down and is completed. Here, a joint material formed in a sheet shape with mortar or the like is attached to the attachment surface of the new nozzle 7, but it may be manually performed or may be automated as shown in the above-described embodiments.

In the embodiment according to the present invention, the operation of attaching and detaching the nozzle is performed by the electric power cylinder, but the operation is not limited to this. An air pressure or hydraulic cylinder may be used, or a cam, screw, It is also possible to move up and down using a sprocket, rack and pinion, etc. Further, although the nozzle main body is moved up and down to attach and detach the nozzle, the entire nozzle attaching and detaching device is placed on a table lifter to move up and down, or a plurality of preheating devices and waste pots installed on a carriage are provided as a set. The sets may be provided in series so that the nozzles of the plurality of tap holes provided in the molten metal container are continuously attached and detached.

[0039]

As described above in detail, the apparatus for attaching and detaching the nozzle for molten metal according to the present invention has a swivel device installed on a carriage and a multi-stage device installed on the swivel device so as to be able to rotate 180 degrees. -Type telescopic arm, a delivery mechanism for the nozzle installed at the top end of the telescopic arm at the top of the transport mechanism, and a sheet-shaped joint material on the upper surface of the nozzle that is installed at a predetermined position on the carriage. Since the joint material supply / compression device to be pasted and the stocker portion for accumulating a large number of joint materials are stored, the nozzle installed at the tap hole of the molten metal container can be easily attached and detached.

The molten metal nozzle attaching / detaching device according to the present invention includes a copying device installed on the carriage so as to be movable in the front-rear direction and the left-right direction, and a nozzle preheating device installed on the upper surface of the copying device. A waste pot that stores used nozzles installed in parallel with the preheating device, a nozzle lifting power cylinder that is installed on the side of the preheating device to mount the nozzle, and a waste cylinder that is installed on the side of the waste pot and removed. The used power cylinder for raising and lowering the waste nozzle that passes the used nozzle to the waste pot, the power cylinder for raising and lowering the nozzle and the power cylinder for raising and lowering the waste nozzle and the power cylinder for raising and lowering the waste nozzle, and after removing It is composed of a power cylinder for moving the drill up and down that moves the cutting drill that cuts the nozzle mounting part of the Together to facilitate attachment and detachment of the nozzle to be in advance preheat the nozzle to be replaced, the centering when mounting this can be facilitated.

Therefore, according to the present invention, the nozzle which is attached to and detached from the tap hole of the molten metal container is capable of performing heavy work in a high temperature atmosphere by an automated attaching and detaching device without any manual labor even in a high temperature state. Since the work efficiency is improved, the new nozzle attached to the molten metal container is preheated in advance, so that the entire nozzle is preheated on average, and the centering work when attaching or detaching the nozzle can be easily performed. .

[Brief description of drawings]

FIG. 1 is a front view showing the outline of a device for attaching and detaching a nozzle for molten metal according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view showing a schematic configuration of a nozzle delivery device.

FIG. 4 is a side view illustrating a schematic configuration of a joint material supply / pressure bonding apparatus.

FIG. 5 is a side view illustrating an operating state of the joint material supply / pressure bonding device.

FIG. 6 is a front view showing a schematic configuration of a device for attaching and detaching a nozzle for molten metal according to a second embodiment of the present invention.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a plan view of FIG.

FIG. 9 is a cross-sectional view showing a structure of a general molten metal container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten metal container 1a Positioning block 7 Nozzle 8 Arms 10, 50 Attachment / detachment device 11, 51 Cart 12 Swiveling device 13 Transport device 14 Transfer device 15 Joint material supply / compression device 16 Stocker part 17 First telescopic arm 18 Second telescopic arm 19 3rd telescopic arm 20 1st cylinder 21 2nd cylinder 22 3rd cylinder 24 Lower base 26 Upper base 27 Vertical lifting cylinders 28, 60, 61 Delivery hand 29 Front-rear moving cylinder 52 Copying device 53 Preheating device 54 Waste pot 55 Nozzle lift power cylinder 56 Waste nozzle lift power cylinder 57 Pin lift power cylinder 58 Cutting drill 59 Drill lift cylinder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Sato 1 Nanto, Ogakie-cho, Kariya city, Aichi Toshiba Ceramics Co., Ltd., Kariya factory (72) Inventor Shogo Mizutani, No. 1, Minamifuji, Ogakie-cho, Kariya city, Aichi prefecture Toshiba Se Lamix Co., Ltd. Kariya Plant (72) Kenichi Tsujimoto, 1st Nanto, Ogakie-cho, Kariya City, Aichi Prefecture Toshiba Ceramix Co., Ltd. Kariya Plant (72) Yuichi Kanai, 1st Minamifuji, Ogakie-cho, Kariya City, Aichi Prefecture Lamix Co., Ltd. Kariya Plant (72) Kenzo Hayashi, 1st Nanto, Ogakie-cho, Kariya, Aichi Prefecture, Toshiba Ceramix Co., Ltd. Kariya Plant, Toshio Kawamura, 1st Nanto, Ogakie-cho, Kariya City, Aichi Prefecture Lamix Co., Ltd., Kariya Plant (72) Inventor Yoshikazu Kubo Waka 1850 Minato Minato, Wakayama City, Yamaguchi Sumitomo Metal Industries, Ltd. Wakayama Works (72) Inventor Susumu Tsujita 4-53, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd.

Claims (6)

[Claims] 1. A carrying mechanism comprising a turning device installed on a trolley, a multi-step telescopic arm installed on the turning device so as to be able to turn 180 degrees, and a tip end part of the top telescopic arm of the carrying mechanism. Nozzle delivery device, a joint material supply / compression device installed at a predetermined position on the trolley to attach a sheet-shaped joint material to the upper surface of the nozzle, and a stocker that stores a large number of joint materials. And a detachable device for a molten metal nozzle. 2. The attachment / detachment device for a molten metal nozzle according to claim 1, wherein the carrying mechanism comprises a three-stage expansion / contraction arm. 3. The carrying mechanism includes a first telescopic arm and a second telescopic arm.
The telescopic arm and the third telescopic arm move upwardly through the first cylinder, the second cylinder, and the third cylinder, respectively.
3. The apparatus for attaching and detaching a molten metal nozzle according to claim 2, wherein the apparatus is connected to the step and each expansion and contraction arm is configured to expand and contract in the forward direction by the operation of each cylinder. 4. The delivery device for the nozzle is installed at the tip of the uppermost third telescopic arm, and engages with two rails fixed in the front-rear direction on the third telescopic arm via a slider. On the lower base, the upper base that engages with two rails fixed on the lower base in the left-right direction via a slider, and the piston rod of the vertical lifting cylinder fixed on the upper base. 3. A delivery hand of a nozzle installed so as to be movable up and down.
Alternatively, the apparatus for attaching and detaching the molten metal nozzle according to claim 3. 5. A copying apparatus movably installed in the front-rear and left-right directions on a trolley, a nozzle preheating apparatus installed on the upper surface of the copying apparatus, and a used nozzle installed in parallel with the preheating apparatus. A waste pot to be stored, a power cylinder for raising and lowering the nozzle that is installed on the side of the preheating device to mount the nozzle, and a used nozzle that is installed on the side of the waste pot and that has been detached to the waste pot. Power cylinder for raising and lowering nozzles, power cylinder for raising and lowering nozzles and power cylinder for raising and lowering waste nozzles when attaching and detaching nozzles, and a cutting drill for cutting the nozzle mounting part after removal up and down An apparatus for attaching / detaching a nozzle for molten metal, comprising a power cylinder for moving a drill up and down. 6. In the attachment / detachment device, a delivery hand for engaging arms protruding from a holder of the nozzle is attached to the upper ends of the nozzle elevation power cylinder and the waste nozzle elevation power cylinder for attaching and detaching the nozzle. , Pins for setting the power cylinder for raising and lowering each nozzle and the power cylinder for raising and lowering the waste nozzle at a predetermined position.A positioning pin fitted to a positioning block attached to the bottom of the molten metal container is provided at the upper end of the power cylinder for raising and lowering The apparatus for attaching / detaching a nozzle for molten metal according to claim 5, wherein the cutting drill attached to the tip of the power cylinder for attachment / descent of the drill is rotationally driven by a drill drive motor.