JPH08281417A - Device for driving rotary nozzle - Google Patents

Abstract

PURPOSE: To prolong the service life of an electric motor and the other electric devices by arranging the electric motor and the other electric devices on a ladle supporting frame apart from a ladle and driving a rotary nozzle through a connecting part, reduction gear, etc., with this output. CONSTITUTION: Rotating of the electric motor 20 is transmitted to a movable set through a ladle supporting side driving shaft 34, ladle supporting side connecting part 36, ladle side connecting part 32, ladle side driving shaft 31, reduction gear and a rotor in the rotary nozzle. On the other hand, since a second driving shaft 34b is freely tiltable while using a pin as a supporting point and supported with a connecting part driving device 38 freely ascendable/ descendable at the top part, the shock at the time of laying a ladle 41 is relaxed. By this constitution, a driving source part of the electric motor and a coupler for electricity at the ladle side are unnecessary, and the electric motor 20 is difficult to affect by radiant heat from molten metal and the service life of the electric motor and the other electric devices can be prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary nozzle which is mounted on the bottom of a ladle and which controls the amount of molten metal poured by rotating a movable cassette to adjust the opening of a nozzle hole with a fixed cassette. The present invention relates to a drive device.

[0002]

2. Description of the Related Art Rotary nozzles are widely used in ladles for carrying and pouring molten metal into molds, and tundish for receiving molten metal from a ladle and pouring it into a mold. Such a rotary nozzle is mounted on the outer surface of the bottom of a ladle or the like directly or on a base mounted through a member, and outputs from a drive source such as an electric motor to a rotor equipped with a movable cassette through a speed reducer. By transmitting and rotating the rotor, that is, the movable cassette, the opening of the nozzle hole with respect to the fixed cassette is adjusted.

FIG. 6 is an explanatory view for explaining an example of a state in which molten metal is cast by a conventional rotary nozzle, FIG. 7 is a bottom view of a ladle, FIG. 8 is an AA enlarged sectional view of FIG. 9 is a block diagram of the drive system of the rotary nozzle. In the figure, 41 is a ladle, 42 is its bottom, and 1 is a rotary nozzle mounted on the outer surface of the bottom 42. Rotary nozzle 1
2 is a base fixed to the bottom portion 42 of the ladle 41 by bolts 3, and is equipped with a fixed cassette 4 made of refractory brick and having a nozzle hole 5. Reference numeral 6 is an upper nozzle which is inserted into the bottom portion 42 of the ladle 41 and the hole penetrating the base 2 and is connected to the fixed cassette 4. Reference numeral 7 denotes a fixed frame (door) rotatably connected to the base 2 by a hinge 8.

Reference numeral 9 denotes a rotor housed in the fixed frame 7 and rotatably arranged on the movable frame 14 via a ball bearing 10, and a drive motor as a drive source on the outer periphery via a speed reducer 21. Gear 11 meshing with gear 22 connected to 20
And a movable cassette 1 facing the fixed cassette 4 and having a nozzle hole 13 made of refractory bricks.
2 are housed. A collector nozzle 15 is attached to the rotor 9 and is connected to the movable cassette 12. 16
Is a plurality of spring seats provided inside the fixed frame 7 so as to face the movable frame 14 and along the outer circumference of the rotor 9, and coil springs 17 are respectively interposed between the movable frame 14 and the fixed frame 7. 9 is pressed to press the movable cassette 12 onto the fixed cassette 4.

Reference numeral 23 is a celsin installed at the bottom of the ladle 41 for detecting the rotation of the drive motor 20, and 24 is an air seal pipe connected to the collect nozzle 15 of the rotary nozzle 1. Reference numeral 25 is an electric automatic coupler, 26 is an electric manual coupler, 27 is a position detection unit for detecting the position of the nozzle hole 13 of the movable cassette 12, 28 is a driving power supply unit, 29 is a target opening control unit of the nozzle holes 5 and 13. is there. 43 is a tundish, 44 is an immersion nozzle, and 45 is a mold of a continuous casting machine.

In the pouring equipment as described above, the ladle 41 containing the molten metal is transported to the continuous casting machine, and the nozzle holes 5 and 13 of the rotary nozzle 1 and the air seal pipe 2 are conveyed.
It is temporarily stored in the tundish 43 via the nozzle 4 and then injected into the mold 45 via the immersion nozzle 44. At this time, the amount of the molten metal injected from the ladle 41 into the tundish 43 is determined by the position detection unit 27 which outputs a rotation signal corresponding to the rotation speed of the drive motor 20 detected by the Celsin 23.
In addition to the above, the position detecting unit 27
The position of the nozzle hole 13 (specifically, the position of the left edge A and the right edge B of the nozzle hole 13) is detected, and the position signal is transmitted to the target opening control unit 29.

In the target opening control unit 29, when the nozzle holes 5 and 13 do not reach the target opening due to the above position signal, the power circuit is turned on and the drive motor 20 is driven by the drive power supply unit 2.
8, the drive motor 20 is driven to rotate the movable cassette 12 via the rotor 9 of the rotary nozzle 1, and the opening of the nozzle hole 5 of the fixed cassette 4 and the nozzle hole 13 of the movable cassette 12 is adjusted. Adjustment is made, and when the target opening is reached, the power supply circuit is turned off and the drive motor 20 is stopped.

[0008]

In such a pouring equipment, the bottom portion 42 of the ladle 41 in which the drive motor 20 and the like are installed is a limited space, and moreover, the radiant heat at high temperature from the molten metal is always present. Since it is exposed, it is in an extremely harsh environment for electric equipment such as the drive motor 20 and the Celsin 23. Therefore, the life is short and the reliability is low even if a high degree of insulation measures is taken.

In the continuous casting machine, the weight of the molten metal in the tundish 43 is kept constant and the head pressure of the molten metal injected into the mold 45 is kept constant. Nozzle holes 5, 13
The opening degree is controlled, but the coarse method is performed by the feedback control of the celsin 23, although the opening degree control is extremely important.

That is, the main purpose of control of the conventional drive motor 20 is to utilize the left edge A and the right edge B of the nozzle hole 13 of the movable cassette 12 of the rotary nozzle 1 to control the drive power source of the drive motor 20 by VVVF. By controlling the discharge amount of the molten metal and utilizing the left and right edges A and B, it is possible to obtain an economical effect by using the fixed cassette 4 and the movable cassette 12 many times. However, in the VVVF control, due to the characteristics of the drive motor 20, the torque at the time of high speed is high, but the torque at the time of low speed is low, so that the required opening positions of the nozzle holes 5 and 13 cannot be controlled with high accuracy. For this reason, when performing delicate control of the nozzle holes 5 and 13, the pulsed driving force is applied to the drive motor 20 so that the drive motor 20 is positioned within a certain range. In the present situation, the positional accuracy of the movable cassette 12 becomes rough because each is different.

Further, when the molten metal is poured, the drive motor 2
0, control device (not shown), electrical couplers 25, 26,
Alternatively, when an electrical failure such as a failure in the electrical wiring, poor contact, disconnection, or burnout occurs, the nozzle holes 5 and 13 cannot be closed to stop the discharge of the molten metal, which may cause equipment damage. is there. As a similar problem, when the molten metal is poured, a failure such as biting of the metal of the rotary nozzle 1 may occur, but the drive motor 20 installed in a limited narrow place of the bottom 42 of the ladle 41 is Since the capacity cannot be increased, it may cause an overload, and the nozzle holes 5 and 13 may not be closed.

The present invention has been made to solve the above problems, and prolongs the life of the electric device including the drive means of the rotary nozzle and controls the opening degree of the nozzle hole of the rotary nozzle with high accuracy. Further, it is an object of the present invention to obtain a safe and highly reliable rotary nozzle drive device capable of forcibly closing the nozzle hole when a failure occurs in the electric system.

[0013]

[Means for Solving the Problems]

(1) A rotary nozzle drive device according to the present invention is provided with a drive means installed on a ladle device stand for driving a movable cassette of the rotary nozzle, and a drive means installed on a ladle mount stand and driven by a drive means. Driving force transmitting means and second driving force transmitting means installed on the outer surface of the bottom of the ladle and detachably connected to the first driving force transmitting means for transmitting the driving force of the driving means to the movable cassette of the rotary nozzle. It is equipped with.

(2) In the rotary nozzle driving device of the above (1), the driving means is composed of a vector-controlled electric motor, and is provided with control means for receiving a rotation signal of the electric motor and performing speed feedback control. is there. (3) Further, the drive means of (1) or (2) above is provided with an emergency drive means.

[0015]

When the ladle containing the molten metal is placed on the placing table, the first driving force transmitting means is mechanically connected to the second driving force transmitting means. Then, the electric motor is energized from the drive power source, the movable cassette is rotated through the rotor of the rotary nozzle, and the nozzle hole is opened to the target opening. While pouring molten metal, the position of the movable cassette is constantly detected from the rotation speed of the electric motor and the position signal is added to the target opening control unit, and the rotation signal is output to the speed detection unit to output the speed signal. Then, this is sent to the driving power supply unit. The driving power supply unit vector-controls the power supply based on this speed signal. When the nozzle hole of the movable cassette does not reach the target opening, the speed-feedback vector-controlled power supply is supplied to the electric motor to rotate the movable cassette to adjust the opening of the nozzle hole.

When a failure occurs in an electric device such as an electric motor or an electric system during pouring molten metal and the nozzle hole cannot be closed, the emergency driving means forcibly rotates the electric motor to rotate the movable cassette. Move to close the nozzle hole.

[0017]

1 is an explanatory view of an embodiment of the present invention, FIG. 2 is a bottom view of a ladle, and FIG. 3 is a block diagram of a drive system of a rotary nozzle. The same parts as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted. In the present invention, only the rotary nozzle 1 and the speed reducer 21 are attached to the outer surface of the bottom portion 42 of the ladle 41, and no electrical device is attached. Reference numeral 31 is a ladle-side drive shaft (second driving force transmission means) connected to the input side of the speed reducer 21, and the tip end portion thereof is a ladle 41.
Is extended to the outside of the bottom portion 42, and a ladle side connecting portion 32 such as a bevel gear is attached.

Reference numeral 51 denotes a ladle support frame which constitutes the ladle mounting table 50. As shown in FIGS. 4 and 5, both arm portions 53a and 53b have upper arms 54a and 54b and a lower arm 5.
5a and 55b (54b and 55b are not shown) are substantially U-shaped, and ladle receiving arms 56a and 56b are fixed to both arm portions 53a and 53b. And
Ladle fulcrum 5 provided on the ladle receiving arms 56a and 56b
7a and 57b include shafts 41a and 41b (41b) of the ladle 41.
(Not shown) is supported.

The electric motor 20 as a driving means is installed on the horizontal portion 52 of the ladle supporting frame 51, and is connected to the ladle supporting side drive shaft 34 (first driving force transmitting means) via the gear box 33. This ladle support side drive shaft 34 is connected
Is extended orthogonally to the ladle support frame 51, and a ladle support side connecting portion 36 such as a bevel gear is attached to the tip end portion thereof. The ladle support side drive shaft 34 is the electric motor 2
The first drive shaft 34a on the 0 side and the second drive shaft 34 on the ladle side
and both drive shafts 34a and 34b.
Are connected by pins 35.

37 is a brake for the drive shaft 34 on the ladle support side, 3
Reference numeral 8 denotes a connecting portion drive device including, for example, a hydraulic cylinder, and is configured to tilt the second drive shaft 34b up and down with the pin 35 as a fulcrum and to hold the second drive shaft 34b in a substantially horizontal position. Reference numeral 39 is an emergency drive device such as an air motor connected to the rotary shaft of the electric motor 20.

Reference numeral 30 denotes a speed detection unit, 40 denotes a rotation detector for detecting the rotation speed of the electric motor 20, and a rotation signal corresponding to the rotation speed of the electric motor 20 detected by the rotation detector 40 is added to the position detection unit 27. The nozzle hole 13 of the movable cassette 12
Is sent as a position signal to the target opening control unit 29 and is sent to the speed detection unit 30 to detect the speed of the electric motor 20, and the output (speed) signal is output to the drive power supply unit 28. Vector-controls the power supply based on this speed signal.

In the present invention constructed as described above, when the ladle 41 containing the molten metal is transported and reaches the continuous casting machine, it is laid down by the ladle crane on the ladle mounting table 50, and its shaft. 41a and 41b are ladle receiving arms 56
The ladle fulcrums 57a and 57b of a and 56b are fitted and supported. At this time, the rotary nozzle 1 and the speed reducer 21 are mounted on the bottom portion 42 of the ladle 41, and the ladle side connecting portion 32 provided on the ladle side drive shaft 31 of the speed reducer 21 is connected to the ladle 41.
It is located outside the outer wall of the.

Further, since the ladle-side drive shaft 31 and the ladle-support-side drive shaft 34 can be vertically engaged with each other and are centered to the left and right, the ladle 41 is attached to the ladle receiving arm 56.
When transferred to a and 56b, the ladle-side connecting portion 32 and the ladle-supporting-side connecting portion 36 are mechanically connected easily and reliably. As a result, the rotation of the electric motor 20 causes the ladle support side drive shaft 34, the ladle support side connection part 36, the ladle side connection part 32, the ladle side drive shaft 31, the speed reducer 21, and the rotor 9 of the rotary nozzle 1. After that, it is transmitted to the movable cassette 12. On the other hand, the second drive shaft 34b is tiltable about the pin 25 as a fulcrum, and is supported by the connecting portion drive device 38 whose top portion can be raised and lowered, so that the impact when the ladle 41 is placed is alleviated. It

Prior to the start of pouring, electric power is supplied to the electric motor 20 from the drive power supply 28 via the target opening controller 29, the movable cassette 12 is rotated via the rotor 9, and the nozzle holes 5 and 13 are closed. Open to the target opening. At this time, the electric motor 20
Is detected by the rotation detector 40, and the rotation signal is sent to the position detector 27. Based on this rotation signal, the position detector 27 detects the position of the nozzle hole 13 of the movable cassette 12, for example, the left edge portion. The position of A is detected and the position signal is added to the target opening control unit 29, and the rotation signal is sent to the speed detection unit 30 and is output to the drive power supply unit 28 as the speed signal of the electric motor 20.

When the position signal of the nozzle hole 13 applied to the target opening control unit 29 does not reach the target value, the power supply circuit is turned on and the drive power supply unit is vector-controlled based on the speed signal. The output of 28 is supplied to the electric motor 20, and the movable cassette 12 of the rotary nozzle 1 is rotated to control the openings of the nozzle holes 5 and 13. Such action is continuously performed from the start of pouring to the end of pouring, and the nozzle holes 5, 1
The opening degree of 3 is always controlled to the target value. During this time, the braking device 37 is activated as necessary to operate the ladle supporting side drive shaft 34.
Can also be stopped and held in that position.

When the pouring is completed, the nozzle holes 5 and 13 of the rotary nozzle 1 are closed. Since the ladle-side connecting portion 32 is connected to the ladle-side connecting portion 36 while being placed above the ladle supporting-side connecting portion 36, the ladle 41 can be lifted as it is. In addition, when some overload is applied to the connecting portions 32 and 36, the connecting portion driving device 38 acts as a buffer mechanism. In addition, when an electrical accident occurs for some reason when the nozzle holes 5 and 13 are opened, the rotor 9 of the rotary nozzle 1, and hence the movable cassette 12 cannot rotate, and the nozzle holes 5 and 13 cannot be closed, The emergency drive device 39 is operated to forcibly rotate the electric motor 20 to rotate the rotor 9 of the rotary nozzle 1 and close the nozzle holes 5 and 13.

As described above, according to the present invention, the electric motor 20 and other electric devices are separated from the ladle 41 and the ladle support frame 51 is provided.
Since the rotary nozzle 1 is installed above, and the output thereof drives the rotary nozzle 1 via the connecting portions 36, 32, the speed reducer 21, etc., the ladle side does not require a drive power source section for an electric motor or an electric coupler. Further, the electric motor 20 is less likely to receive radiant heat from the molten metal. Therefore, it is possible to extend the life of the electric motor 20 and other electric devices without worrying about insulation measures for the electric motor 20 and the like.

Further, since the electric motor 20 having a large capacity can be used, even if the metal is caught, it can be solved without causing an accident due to overload. Further, when the electric system fails due to some cause in the opening of the nozzle holes 5 and 13 and the electric motor 20 cannot rotate, the emergency drive device 39 is operated to operate the nozzle holes 5 and 1.
Since 3 is closed, safe equipment can be realized.

Further, the electric motor 2 for controlling the opening / closing of the nozzle holes.
Since the speed feedback is incorporated into 0, it is possible to handle from very low speed to high speed, and the vector control method is adopted in the power supply device to control the operation of the electric motor 20, so that the opening angle position of the nozzle hole of the rotary nozzle is highly accurate. Can be controlled with.

[0030]

【The invention's effect】

(1) A rotary nozzle driving device according to the present invention comprises a driving means installed on a ladle mounting table for driving a movable cassette of the rotary nozzle, and a driving means installed on the ladle mounting table and driven by a driving means. Second driving force transmitting means for transmitting the driving force of the driving means to the movable cassette of the rotary nozzle by detachably connecting the first driving force transmitting means installed on the outer surface of the bottom of the ladle Since it was composed by
The following effects can be obtained.

Since the driving means and other electric devices are not affected by the radiant heat of the high temperature molten metal, it is possible to easily take insulation measures and prolong the service life. Therefore, the facility cost and the maintenance cost can be reduced. . Further, since the installation space of the driving means is large, it is possible to install the driving means having a large capacity. Therefore, even if an accident such as biting of the metal during pouring occurs, there is no risk of an accident due to overloading of the driving means, and it is possible to obtain a safe and reliable drive device for the rotary nozzle. it can.

(2) An electric motor incorporating speed feedback is used as a driving means for controlling the opening and closing of the nozzle hole, and it is possible to support from a low speed to a high speed. Further, a vector control system is adopted in the driving power source section to drive the electric motor. Since it is controlled, the opening degree of the nozzle hole of the rotary nozzle can be controlled with high accuracy, and a highly reliable rotary nozzle drive device can be obtained.

(3) Further, the drive means is provided with an emergency drive means, and when the electric motor or the electric system fails due to some cause in the opening of the nozzle hole and the drive means cannot operate, the emergency drive means. Since the nozzle hole during molten metal pouring is blocked by the above, it is possible to prevent a failure such as equipment damage due to the outflow of molten metal, and to obtain a safe and highly reliable rotary nozzle drive device. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of the present invention.

2 is a bottom view of the ladle of FIG. 1. FIG.

3 is a block diagram of a rotary nozzle drive system in FIG. 1. FIG.

FIG. 4 is a side view of a ladle support device.

5 is a perspective view of the ladle support frame of FIG. 4. FIG.

FIG. 6 is an explanatory diagram showing an example of a molten metal casting state by a conventional rotary nozzle.

FIG. 7 is a bottom view of the ladle shown in FIG.

8 is an enlarged cross-sectional view taken along the line AA of FIG.

9 is a block diagram of the rotary nozzle drive system of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary nozzle 20 electric motor 21 speed reducer 27 position detection unit 28 drive power supply unit 29 target opening control unit 30 speed control unit 31 ladle side drive shaft (second driving force transmitting means) 32 ladle side connection unit 34 ladle Support side drive shaft (first drive force transmitting means) 35 pin 36 Ladle support side connection part 37 Braking device 38 Connection part drive device 39 Emergency drive device 40 Rotation detector

Claims (3)

[Claims] 1. A driving means installed on a ladle mounting table for driving a movable cassette of a rotary nozzle, and a first driving force transmitting means installed on the ladle mounting table and driven by the driving means. And second driving force transmitting means installed on the outer surface of the bottom of the ladle, detachably connected to the first driving force transmitting means, and transmitting the driving force of the driving means to the movable cassette of the rotary nozzle, A drive device for a rotary nozzle, comprising: 2. The rotary according to claim 1, wherein the driving means is a vector-controlled electric motor, and further comprising control means for receiving a rotation signal of the electric motor and performing speed feedback control of the electric motor. Nozzle drive device. 3. The drive device for a rotary nozzle according to claim 1, wherein the drive means includes an emergency drive means.