JP3168157B2 - Long nozzle attachment / detachment device for continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of continuous casting equipment, and more particularly to a long nozzle attaching / detaching apparatus which is detachably attached to a ladle bottom for pouring molten steel from a ladle to a tundish.

[0002]

2. Description of the Related Art When pouring molten steel from a ladle into a tundish in a continuous casting facility, a pouring nozzle called a long nozzle or a ladle nozzle is pressed into a molten steel pouring port at the bottom of the ladle and then lowered together with the ladle to form a long nozzle. The lower end of the nozzle is immersed in a tundish and poured. The long nozzle is held by a suitable holding bar or holding arm so as to be vertically movable and horizontally movable in accordance with the movement of the ladle itself and the operation of an opening / closing slide (sliding plate) having a molten steel pouring port, and is held by the sliding plate. Be attached. After pouring, the long nozzle is removed from the ladle, reheated or repaired or inspected as necessary at another place, transported to the long nozzle table, and put on standby for the next use.

Conventionally, a long nozzle is attached to a molten steel pouring port of a ladle by carrying the long nozzle from a table of the long nozzle to a ladle position by a forklift, holding the long nozzle at the tip of a seesaw type holding bar, and manually inputting the holding nozzle. A method of operating the rear end to press the upper end of the long nozzle against the sliding plate has been adopted. There is also known a push-type long nozzle attaching / detaching device that holds a horizontal telescopic arm holding a long nozzle on an elevating post that can pivot about a vertical axis and automatically attaches / removes a long nozzle by remote control. . In addition, a long nozzle holding device has been developed in which a swinging arm supporting a long nozzle is operated by a drive cylinder via a parallel link mechanism, and the long nozzle is moved up and down, back and forth, and turned.

[0004]

The structure in which the operation for attaching and detaching the long nozzle is operated by a driving cylinder or the like via a parallel link mechanism requires a large-scale apparatus, and increases equipment costs. In addition, a simple long nozzle holding device that manually moves and positions the holding portion of the long nozzle in an arbitrary direction requires a great deal of labor and skill in operating the holding portion, and has a problem in terms of safety. In addition, the press-type long nozzle attaching / detaching device must be mounted on the ladle and use the driving force for pressing the long nozzle until pouring into the tundish is completed, which consumes a large amount of power. In the pressing method, if the adhesion between the long nozzle and the sliding plate is poor, air may be injected into the long nozzle, and if the pouring is continued in this state, the quality of the steel material may be impaired.

According to the present invention, a long nozzle can be automatically attached and detached with a simple structure by using attachment / detachment means by screwing or rotating engagement in place of the conventional pressing type. It is an object of the present invention to provide a long nozzle attaching / detaching device for a continuous casting machine which eliminates the danger of air injection.

[0006]

According to the present invention, there is provided an elevating mechanism, which is provided upright on a base frame so as to be rotatable about a vertical axis, and an elevating drive unit, and a drive mechanism for rotating the elevating mechanism. A telescopic arm held on the elevating mechanism, a telescopic drive unit thereof, and a long nozzle for detachably holding a long nozzle at a distal end of the telescopic arm
In a long nozzle attaching / detaching device having a holding mechanism,
The long nozzle holding mechanism can rotate around the vertical axis
Long Nozzle Holder Support Cylinder and Its Rotary Drive Mechanism
And the long nozzle holder support cylinder so as to be rotatable integrally.
And a rotary attachment / detachment mechanism for the nozzle on the ladle side.
And a long nozzle holder for a continuous casting machine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway side view showing a long nozzle attaching / detaching apparatus according to an embodiment of the present invention, and FIG. 2 is a partially cutaway plan view of FIG. An elevating frame guide post 10 is erected on a base frame 7 serving as a base of the apparatus via a swivel 26 to be described later, and a cylindrical elevating frame 24 is mounted on the guide post 10 so as to be able to elevate and lower. The guide post 10 and the elevating frame 24 can slide with respect to each other, but cannot rotate with respect to each other. Therefore, the guide post 10
The cross-sectional shape of the lifting frame 24 is a quadrangle (polygon) other than a circle. If the cross section is circular, it is necessary to interpose a key between the guide post 10 and the lifting frame 24. A substantially horizontal cylindrical telescopic arm guide frame 25 is fixed to the upper part of the elevating frame 24, and the rear part of the telescopic arm 12 is inserted into the guide frame 25. The telescopic arm 12 is moved in and out in the arm axis direction by a telescopic drive cylinder 9 provided on the guide frame 25.

A swivel 26 is rotatably supported on the base frame 7, and the elevating frame guide post 10 is erected on the swivel 26. A rolling bearing is provided between the swivel 26 and the base frame 7. 8 are interposed. The lifting drive cylinder 11 is mounted between the swivel 26 and the lifting frame 24. An annular external gear 28 is fixed to the outer periphery of the base frame 7 (in the embodiment, provided on the bearing 8 on the base frame 7 side), and the external gear 28 is mounted on a revolving base 26. The small gear 29 of the output shaft of the driving device 6 meshes with the small gear 29, and the small gear 29 rolls on the external gear 28, whereby the swivel 26 rotates, and the lifting frame 24 moves around the axis via the guide post 10. Rotate.

FIG. 3 and FIG.
3A and 3B are a side cross-sectional view and a plan cross-sectional view of a rotation attachment / detachment mechanism provided at a distal end portion of FIG. A rotary detachable drive hydraulic motor 13 and a speed reducer 14 are mounted near the tip of the telescopic arm 12, and a nozzle holder support cylinder 20 is supported at the tip of the arm so as to be rotatable about a vertical axis. The support mechanism includes a flange 30 formed on the periphery of the support tube 20 to ensure smooth rotation of the support tube 20.
And a plurality of rolling balls 3 interposed between the upper and lower surfaces of the flange portion 30 and the ball accommodating portion 32 of the telescopic arm 12.
The support cylinder 20 receives a vertical thrust by these balls. Further, a large sprocket 17 is formed around the nozzle holder support cylinder 20, and a chain 16 is provided between the large sprocket 17 and the small sprocket 15 provided on the output shaft of the speed reducer 14.
Is driven, and the nozzle holder support cylinder 20 is rotated forward and reverse around its axis by the drive of the hydraulic motor 13 via the chain 16.

As shown in FIG. 3, a long nozzle holder 19 is supported on the upper portion of the nozzle holder support tube 20. This long nozzle holder 19
Is a hollow member, into which the long nozzle 3 is inserted from above, and an inner flange portion 33 which supports the long nozzle 3 at the bottom of the holder 19 by engaging with a step portion below the head of the long nozzle 3. Are formed, and a support projection 34 extending on both sides in the diameter direction is formed on the outer side. At the upper end of the long nozzle holder support cylinder 20, substantially V- or U-shaped cutout grooves 35 are formed on both sides in the diameter direction.
5, the support projection 34 of the long nozzle holder 19 is engaged,
As a result, the long nozzle holder 19 is
Supported by With this structure, the long nozzle holder 1
Reference numeral 9 denotes a rotation operation of the support tube 20, which rotates integrally with the support tube 20, and a long nozzle holder support tube 20 can be detached downward from the long nozzle holder 19 by a descending operation of the telescopic arm 12.

The bayonet engaging groove 3 shown in detail in FIGS.
6 are formed at four locations in the circumferential direction. Also, as shown in FIGS. 6A and 6B, four outer circumferential portions corresponding to the bayonet engaging grooves 36 are provided on the outer periphery of the lower portion of the ladle side nozzle 18 mounted on the ladle side sliding plate 2. A bayonet engaging projection 37 is formed. By raising the long nozzle holder 19 in a state of being aligned with the axis of the ladle side nozzle 18, the ladle side nozzle 1
8 is inserted into the upper part of the long nozzle holder 19, and then the long nozzle holder 19 is rotated by a predetermined angle around the axis, so that the bayonet engagement groove 36 and the bayonet engagement protrusion 37 of the ladle side nozzle 18 are engaged. Then, in this state, the upper end surface of the long nozzle 3 is in close contact with the lower end surface of the ladle side nozzle 18, and the long nozzle 3 is mounted on the ladle side nozzle 18.
When removing the long nozzle holder 19 from the ladle side nozzle 18, the bayonet engagement groove 36 and the bayonet engagement between the bayonet engagement groove 37 and the engagement protrusion 37 are released by rotating the long nozzle holder 19 in the reverse direction.

Although the above description partially overlaps with the above description, the operation of attaching and detaching the long nozzle to and from the ladle of the long nozzle attaching and detaching apparatus having the above structure will be described below. The telescopic arm 12, which has received the long nozzle 3 from the long nozzle table 23, is turned by the turning drive device 6 to the position below the waiting ladle 1 to operate the lifting drive cylinder 11 and the telescopic drive cylinder 9. The axial center of the long nozzle holder 19 at the tip of the arm 12 and the ladle side nozzle 18
And the lifting drive cylinder 11 is further raised, and the ladle side nozzle 18 is inserted into the long nozzle holder 19. And a hydraulic motor 1 for rotating and detaching drive
By driving the long nozzle holder support cylinder 20 to engage the bayonet engagement groove 36 with the engagement protrusion 37 by the driving of the third nozzle 3 as described above, the telescopic arm 12 is lowered by the lifting drive cylinder 11. , The long nozzle holder support cylinder 20 is detached downward from the long nozzle holder 19,
The mounting of the long nozzle 3 is completed. The ladle 1 equipped with the long nozzle 3 descends from above the tundish 4 at the casting position and pours molten steel 5 into the tundish 4.

During casting, the telescopic arm 12 is retracted to another fixed position, and the urging of the elevation drive cylinder 11 is started again from a position below the long nozzle 3 of the ladle 1 which has moved to a predetermined position after casting. The telescopic arm 12 is lifted by the
9 is inserted into the long nozzle holder support tube 20, and the support tube 20 is rotated in the opposite direction to disengage the bayonet engagement between the ladle 1 and the long nozzle 3. 19 together with the telescopic drive cylinder 9 and the turning drive 6
Moves to the long nozzle preheating device 22 to deliver the long nozzle 3 to the preheating device 22 for the next use.
In addition, the turning drive device 6, the lifting drive cylinder 11,
Both the telescopic drive cylinder 9 and the rotary detachable drive hydraulic motor 13 can be controlled by remote control.

In the present invention, in addition to the bayonet engaging means described above, a screw-in engaging means can be used as the rotation attaching / detaching mechanism of the long nozzle 3. In this case, a male screw groove is formed on the ladle side nozzle 18 and a female screw groove is formed on the inner periphery of the long nozzle holder 19, and the two are engaged and disengaged by the rotation of the long nozzle holder 19 in the same operation as described above.

Further, as the rotation driving means of the long nozzle holder supporting cylinder 20, a meshing means using a worm and a pinion can be used. 7A and 7B are a plan sectional view and a partial side sectional view showing an embodiment in this case. A worm 40 is attached to the output shaft of a rotary drive motor 39 provided on the inner side near the tip of the telescopic arm 12, and a pinion 41 that meshes with the worm 40 is fixed to the outer periphery of the long nozzle holder support cylinder 20. The long nozzle holder 19 and the ladle side nozzle 18 are engaged and disengaged by the forward and reverse rotations of. If necessary, a worm speed reducer is connected to the rotary drive motor 39.

[0016]

As described above, according to the present invention, the rotary nozzle by bayonet engagement or screw engagement is used instead of the conventional pressing method for attaching and detaching the long nozzle and the ladle side nozzle. Quick and simple structure
The long nozzle can be attached and detached automatically without fail.After the long nozzle is mounted, the arm holding the long nozzle is moved to another fixed position and the long nozzle is immediately mounted on the ladle waiting for the next casting. To hit the action,
Alternatively, the long nozzle can be removed from the ladle that has moved after casting has been completed, thereby improving work efficiency and mounting the long nozzle more reliably than the push type. Alternatively, there is an effect that the danger of injecting air into the nozzle during use can be eliminated.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view of a long nozzle attaching / detaching apparatus according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the long nozzle attaching / detaching device shown in FIG.

FIG. 3 is a side cross-sectional view of a rotation attachment / detachment mechanism provided at a distal end portion of a telescopic arm.

FIG. 4 is a plan sectional view of the rotation attachment / detachment mechanism shown in FIG. 3;

5A and 5B are a plan view and a side view showing details of a bayonet engaging groove at the tip of a long nozzle holder according to an embodiment of the present invention.

FIG. 6 is a plan sectional view and a side view showing details of a bayonet engaging projection of a ladle-side nozzle that engages with the bayonet engaging groove shown in FIG. 5;

FIG. 7 is a plan sectional view and a partial side sectional view showing another example of the rotation driving means of the long nozzle holder supporting cylinder according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ladle 3 long nozzle 6 rotation drive device 9 telescopic drive cylinder 10 elevating guide post 11 elevating drive cylinder 12 telescopic arm 13 rotary hydraulic motor for detachable drive 15 small sprocket 17 large sprocket 18 ladle side nozzle 19 long nozzle holder 20 long nozzle Holder support cylinder 24 Elevating frame 25 Telescopic arm guide frame 26 Swivel table 34 Support projection 35 Notch groove 36 Bionet engaging groove 37 Bionet engaging projection

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kihachi Ikebe 1 Konomi-cho, Kokurakita-ku, Kitakyushu-shi, Fukuoka Sumitomo Metal Industries Co., Ltd. (72) Inventor Yasuhiro Kawasaki 1 Konomi-cho, Kokurakita-ku, Kitakyushu-shi, Fukuoka No. Sumitomo Metal Industries, Ltd. Ogura Works (56) References JP-A-7-80610 (JP, A) JP-A-56-139259 (JP, A) JP-A-62-168661 (JP, A) JP-A-7-185754 (JP, A) JP-A-59-190466 (JP, U) JP-A-59-194359 (JP, U) JP-A-58-28771 (JP, A) U) Japanese Utility Model Hei 3-120949 (JP, U) Japanese Utility Model Sho 58-66065 (JP, U) Japanese Utility Model Utility Model 56-131959 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) ) B22D 11/10 320 B22D 11/10 330 B22D 41/56

Claims (1)

(57) [Claims] An up-and-down mechanism mounted on a base frame so as to be rotatable about a vertical axis;
A drive mechanism for rotating the elevating mechanism, a telescopic arm held on the elevating mechanism and its telescopic drive,
A long nozzle is detachably attached to the tip of the telescopic arm.
Of a long nozzle having a long nozzle holding mechanism
In the attaching / detaching device, the long nozzle holding mechanism may be a vertical
Long nozzle holder support cylinder rotatable around the axis
And its rotary drive mechanism and the long nozzle holder support cylinder
To be rotatable integrally with the nozzle on the ladle side
And a long nozzle holder with a rotary attachment / detachment mechanism.
Continuous casting machine for long nozzle attachment apparatus, characterized in that that.