JP2932413B2 - External immersion nozzle recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recovering an exterior-integrated immersion nozzle for recovering an exterior-integrated immersion nozzle from a tundish during a hot rotary operation.

[0002]

2. Description of the Related Art Conventionally, in a hot rotary operation, a method of recovering a split-type injection system immersion nozzle from a tundish used for continuous casting involves a sliding nozzle for adjusting a flow rate of molten steel flowing out of the immersion nozzle. Remove the mechanism you are using and set up the tundish,
The upper nozzle was collected from the tuyere using a crawler drill.

In the method of recovering an external immersion nozzle from a tundish, a nozzle pushing device is carried on a tundish by a crane or a hoist or the like, and a cylinder reciprocating by a hydraulic or electric motor is operated. The punching device was driven to collect the exterior type immersion nozzle from the tundish.

[0004]

When the tundish immersion nozzle is replaced during the hot rotary operation, it is necessary to extend the life of the tundish and to improve the quality of the slab to be manufactured. It is necessary to carry out the collection and replacement work quickly. In addition, it is necessary to ensure the safety of workers and the like at the time of removal. However, in the above-described conventional immersion nozzle recovery device, since a dedicated device is required to remove the immersion nozzle from the tundish, installation and removal of the recovery device requires time and equipment costs increase. there were.

Further, when the immersion nozzle is removed, there is no means for supporting peripheral devices such as the removed immersion nozzle and a support base for supporting the immersion nozzle. Therefore, there is a possibility that the detached immersion nozzle or peripheral device may fall or scatter. Particularly, in a hot work, it is very dangerous that a heated immersion nozzle or the like falls to an unexpected position.

[0006]

SUMMARY OF THE INVENTION The present invention provides a truck traveling on a rail, a loading table mounted on the truck via a support table so as to be able to move up and down, a lifting device for moving the loading table up and down, In a recovery device of the exterior type immersion nozzle for recovering the exterior type immersion nozzle from the tundish used in the continuous casting, which comprises a follower for pressing the writing table against the support base of the immersion nozzle, the following device is:
A lower spring seat erected on the support table, an upper spring seat vertically extending downward from the lower surface of the setting table, and a spring provided between the upper and lower spring seats, and between the support table and the setting table. Bolts to prevent falling off during swing,
Provided is a recovery device for an exterior type immersion nozzle, which is provided with a nut.

[0007]

During operation, the immersion nozzle is supported by a support base, and this support base is attached to a fixed base attached to the lower part of the tundish with bolts or the like using a cotter.

In order to replace the immersion nozzle, the tundish is moved to an appropriate working position, and then the immersion nozzle recovery device is moved below the immersion nozzle. Then, the lifting device is driven to raise the support table and the mounting table, and the mounting table is pressed against the support base of the immersion nozzle. On this occasion,
The mounting table is pressed against the support base by the follower.
The follower has a structure in which a spring is interposed between a lower spring seat erected on the support table and an upper spring seat vertically erected downward from the lower surface of the mounting table. It acts to follow and absorb the shock when the immersion nozzle comes off the tundish. That is, the support base attached to the fixed base is
In some cases, such as when the steel skin undergoes thermal deformation, it may deviate from the original mounting state and tilt. Therefore, in order to ensure the support base with the mounting table, it is necessary to make the mounting table follow the inclination of the support base, so that a follow-up device is provided. In this state, when the cotter fixing the support base to the tundish is removed, the support base is placed on the mounting table.

Next, after the lifting table is driven to slightly lower the mounting table, the tip of a stopper for adjusting the amount of molten steel injected into the immersion nozzle is pressed against the top of the immersion nozzle. Then, by further depressing the stopper, the immersion nozzle is depressed below the tundish and placed on the placing table to be collected. The immersion nozzle recovery device that has recovered the immersion nozzle moves to the standby position and ends the recovery operation.

Therefore, the immersion nozzle can be recovered by using the stopper used for casting as one of the attached equipment of the tundish without requiring any special equipment, so that the equipment cost can be saved and the speed can be reduced. The immersion nozzle can be recovered. Furthermore, since the removed immersion nozzle and peripheral devices are reliably recovered by the immersion nozzle recovery device, safety can be ensured in the operation.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view of the immersion nozzle recovery device, FIG. 2 is a plan view of the immersion nozzle recovery device, and FIGS. 3 and 4 are explanatory diagrams illustrating a state in which the immersion nozzle is removed from the tundish.

The tundish 1 used for continuous casting is provided with a refractory 3 on the inner surface of a boat-shaped steel shell 2 and a tuyere 5 at the bottom for mounting a dipping nozzle 4. A support frame 6 extending outward from the steel shell 2 of the tundish 1 has an air cylinder 8 and a crank member 9 for driving a cotter 7 described later, and an amount of molten steel injected into the immersion nozzle 4. The drive mechanism 11 of the stopper 36 for adjusting the pressure is provided.

The immersion nozzle 4 attached to the tundish 1 is a cylindrical member having an insertion portion 12 at an upper portion for insertion into the tuyere 5 of the tundish 1 and an outlet 13 for molten steel at a lower portion. The above-described insertion portion 12 has a bulging portion 14 formed in the body of the immersion nozzle 4, and the diameter of the bulging portion 14 is reduced toward the upper end.

In order to attach the immersion nozzle 4 to the tundish 1, a support ring 15 is attached from below the bulging portion 14, and the support ring 15 is supported by a support base 16 from below. Then, the cotter mounting member 17 erected on the support base 16 is inserted into the cotter mounting member insertion hole 19 of the fixed base 18 mounted on the lower surface of the tundish 1 with bolts or the like. In this state, when the cotter 7 enters the cotter insertion hole 20 provided in the cotter attachment member 17, the immersion nozzle 4 supported by the support base 16 can be attached to the tundish 1.

The cotter 7 slides on the fixed base 18 while being supported by a cotter support 21 provided on the fixed base 18. The base end of the cotter 7 is connected to one end of a crank member 9 attached to the outside of the tundish 1, and the other end of the crank member 9 is connected to a rod 22 of the air cylinder 8.

Therefore, when the rod 22 is extended by driving the air cylinder 8, the cotter 7
The upper part slides toward the inside of the tundish 1 and enters the cotter insertion hole 20 of the support base 16. On the other hand, when the air cylinder 8 is driven to contract the rod 22, the cotter 7 slides on the fixed base 18 toward the outside of the tundish 1, and the cotter insertion hole 2 of the support base 16 is formed.
From 0, the cotter 7 can exit.

The immersion nozzle collecting device 23 on which the detached immersion nozzle 4 is mounted has a support table 26 mounted on a carriage 25 running on a rack rail 24 so as to be able to move up and down, and a follower 27 is provided on the support table 26. A mounting table 28 is swingably mounted on the device 27. Further, the mounting table 28 and the support table 26 are provided with a series of insertion portions 29 in which the immersion nozzles are inserted substantially at the center.

The follower 27 has a structure in which a spring 32 is interposed between a lower spring seat 30 erected on the support table 26 and an upper spring seat 31 erected downward from the lower surface of the mounting table 28. In order to make the mounting table 28 follow the inclination of the support base 16 and to absorb the shock when the immersion nozzle 4 comes off the tundish 1. That is, the support base 16 attached to the fixed base 18 may be deviated from the original attached state and inclined when the steel shell 2 is thermally deformed. Therefore, the mounting table 28
In order to ensure the support base 16 by the above, it is necessary to make the mounting table 28 follow the inclination of the support base 16, and therefore, a follow-up device 27 is provided. Further, since the support base 16 can be removed in a state where the mounting table 28 is pressed against the support base 16, all the cotters 7 can be smoothly and reliably withdrawn.

Further, in order to prevent the mounting table 28 from swinging and coming off the follower 27, the mounting table 28
A bolt 33 is attached from below to below. The lower end of the bolt 33 is in the bolt insertion hole 3 of the support table 26.
4 and bolts 33 from the lower surface of the support table 26.
Is prevented from coming off by a nut 33a attached to the tip of the. The support table 26 and the mounting table 28 supported by the support table 26 are moved up and down by an elevating device 35 using a hydraulic cylinder or the like provided integrally with the carriage 25 as a driving source.

The above-mentioned stopper 36 is a columnar member having a hemispherical molten steel flow control portion 37 at the lower end, and an operating rod 38 extending outward from the tundish 1 at the upper end.
The tip of is attached. The drive mechanism 1 provided on the support frame 6 of the tundish 1 is provided at the base end of the operating rod 38.
Contact 1

The drive mechanism 11 includes bearings 39, 39 provided vertically on the support frame 6, and a drive shaft 40 supported by the bearings 39 and operating vertically between the bearings 39, 39.
And a drive member 41 for moving the drive shaft 40 up and down. The drive shaft 40 has teeth 42 connected in the up and down direction of the outer peripheral surface. The drive member 41 includes a gear 43 that rotates while meshing with the teeth 42 and extends outward from the gear 43. And a lever 44 provided. The base end of the operating rod 38 is connected to the upper end of the drive shaft 40.

Therefore, when the lever 44 of the driving member 41 is turned upward, the driving shaft 40 meshed with the gear 43 moves downward, and the operating rod 38 connected to the upper end of the driving shaft 40 is moved. The stopper 36 connected to the tip of the operating rod 38 also moves downward. On the other hand, when the lever 44 of the driving member 41 is rotated downward, the driving shaft 40 meshed with the gear 43 moves upward, and the operating rod 3 connected to the upper end of the driving shaft 40 is moved.
The stopper 36 connected to the tip of the operating rod 8 and the operating rod 38 also moves upward.

In operation, the stopper 36 is not driven by the above-mentioned drive mechanism 11 but by a separately provided electric or hydraulic drive device. Further, the shape of the stopper 36 and the drive mechanism 11 are not limited to those described above, and the stopper 36 may be moved up and down from above the immersion nozzle 4 toward the top of the immersion nozzle to adjust the shape of the molten steel to be introduced. But
The drive mechanism 11 may have any configuration as long as the stopper 36 can be driven.

In order to recover the immersion nozzle 4 using the immersion nozzle recovery device described above, first, the immersion nozzle recovery device 23 is positioned below the immersion nozzle 4. Then, the mounting table 28 of the immersion nozzle collecting device 23 is fixed to the fixed base 18.
Is raised to a position where it comes into contact with the support base 16 attached to the support base 16. At this time, the mounting table 28 is pressed against the support base 16 by the follower 27. In this state, when the air cylinder 8 is driven to pull out the cotter 7 from the cotter insertion hole 20 of the support base 16, the support base 16 and the support ring 15 are detached from the fixed base 18, and the mounting table of the immersion nozzle collecting device 23 is placed. 28.

The immersion nozzle 4 loses the support by the support base 16 and the support ring 15 and may come off from the tuyere and rest on the mounting table 28 as it is. It still remains in the tuyere 5 due to the effect of the mortar applied. Here, the immersion nozzle recovery device 2
After lowering the mounting table 28 slightly, the driving member 41
The lever 44 is rotated upward to stop the stopper 3
6 is pushed down, and the tip of the stopper 36 is
The immersion nozzle 4 can be removed from the tuyere 5 by contacting the upper part of the nozzle and further pressing down the stopper 36. When the removal of the immersion nozzle 4 is completed, after the mounting table 28 is lowered, the carriage 25 is moved to the standby position, and the operation of collecting the immersion nozzle 4 is completed.

[0026]

As described above, according to the present invention,
A carriage traveling on a rail, a mounting table mounted on the carriage so as to be able to move up and down, an elevating device for elevating the mounting table, and a follower for pressing the mounting table to a support base of the immersion nozzle. From the outer-type immersion nozzle.

Therefore, when removing and recovering the exterior-integrated immersion nozzle from the tundish, the stopper already attached to the tundish should be used without using a device such as a crawler drill or a punching jig with a cylinder. Therefore, the time for attaching and detaching the collecting device is not required, and the facility cost can be significantly reduced.

Further, when the immersion nozzle is detached, peripheral devices such as the detached immersion nozzle and a support base for supporting the immersion nozzle are securely secured by the immersion nozzle recovery device by a simple follower used in the present invention. Can be supported. Therefore, there is no danger that the detached immersion nozzle or peripheral device will fall or scatter, and an excellent effect that safety can be ensured can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view of an immersion nozzle replacement device according to an embodiment of the present invention.

FIG. 2 is a plan view of the immersion nozzle changing device.

FIG. 3 is an explanatory view showing a state in which the immersion nozzle is removed from the tundish by the immersion nozzle replacement device.

FIG. 4 is an explanatory view showing a state in which the immersion nozzle is removed from the tundish by the immersion nozzle replacement device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tundish 4 Immersion nozzle 25 Bogie 27 Follower device 28 Mounting table 35 Elevating device

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tokiya Shirai 1 Nippon Steel Corporation, Hirohata Works, Hirohata-ku, Himeji City, Hyogo Prefecture (56) References JP-A-2-280959 (JP, A) Real opening 63-6161 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 11/00-11/22 B22D 41/56

Claims (1)

(57) [Claims] A trolley running on a rail, a mounting table mounted on the trolley via a support table so as to be movable up and down,
An external immersion nozzle for recovering an external immersion nozzle from a tundish used in continuous casting, comprising a lifting device for raising and lowering the mounting table and a follower for pressing the mounting table against a support base of the immersion nozzle. The follow-up device comprises a lower spring seat erected on the support table, an upper spring seat erected downward from the lower surface of the placing table, and a spring provided between the upper and lower spring seats. ,
A recovery device for an exterior type immersion nozzle, comprising a bolt and a nut between the support table and the placement table for preventing slipping during swinging.