JP2575209Y2 - Electric control device of stopper for casting nozzle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an electric motor for a continuous or semi-continuous casting immersion nozzle stopper for supplying a molten metal to a mold having an open upper end which is used for continuously casting a slab of metal or alloy. The present invention relates to a control device, and more particularly to an improvement in an electric control device of a stopper for an immersion nozzle suitable for a continuous or semi-continuous casting method for supplying molten metal to a mold having a large number of strands.

[0002]

2. Description of the Related Art Continuous casting is a method of melting molten metal in a tundish,
Alternatively, the molten metal discharged from a melting furnace into a gutter is poured into a water-cooled copper mold, cooled by the mold to solidify the molten metal sequentially, and a slab is continuously drawn from the mold. In order to stably cast slabs with few casting defects by continuous or semi-continuous casting method,
Perform uniform heat removal in the mold, supply sufficient mold flux to cover the top of the molten metal, maintain lubricity between the mold and the slab, and keep the amount of molten metal supplied to the mold constant. It is important to prevent mold flux from getting into the mold. In general, as a mold for continuous or semi-continuous casting of a metal or alloy slab, a short through mold composed of a pair of mold long pieces as well as a pair of opposed mold short pieces is used. When supplying the molten metal into the mold from the tundish or the gutter, an immersion nozzle is attached to the lower part of the tundish or the gutter, and the molten metal is ejected from the lower part of the nozzle and injected into the mold.

Conventionally, there are several types of outlets of the immersion nozzle, and nozzles suitable for the type of molten metal to be cast and the shape of a mold have been used. For example, when a slab slab of a copper-based alloy is cast by a continuous or semi-continuous casting method, the reverse T-shape shown in FIG. The use of a two-hole nozzle 1 has become common. The nozzle 1 generally has a cylindrical jet port 2 along a center line of a cross section perpendicular to the casting direction, and the jet port 2 is provided with a tundish such that the molten metal is jetted in parallel with the long side of the mold 3. Or it is attached to the gutter 4. The nozzle 1 is provided with a nozzle stopper 5 as shown in FIG.
Is operated up and down by an air cylinder or a hydraulic cylinder 6 attached to a tundish or gutter 4. Further, as an electric control device of a stopper for a casting nozzle, Japanese Patent Application Laid-Open No. 3-193 proposed by the present applicant has been proposed.
No. 263 is disclosed.

[0004]

However, in the conventional nozzle stopper control devices described above, the nozzle stopper is moved up and down directly to the nozzle by an air cylinder or a hydraulic cylinder to open and close the nozzle, thereby controlling the molten metal supply amount. Since the tundish or gutter is bent downward due to the weight and high heat of the molten metal and the center between the nozzle and the nozzle stopper is displaced, it becomes impossible to control the supply of the molten metal uniformly to each mold. There was a problem. Further, at the start of casting and at the end of casting, the nozzle stopper needs to be quickly fully opened or fully closed. However, the conventional control device has a disadvantage that a slight time lag occurs.

In the conventional control device, when the number of strands (the number of ingots to be cast at the same time) increases, it is important to keep the level of the molten metal of each mold constant in order to make the quality of each slab uniform. Therefore, it is necessary to finely adjust each nozzle stopper opening independently, but there is a problem that the operation is difficult. Further, there is a problem that the fluctuation of the molten metal level in each mold causes intensification of the convection of the molten metal, and the quality of the cast slab is deteriorated due to the entrainment of the flux. Further, in the electric control device of the stopper for the casting nozzle described in the above-mentioned Japanese Patent Application Laid-Open No. 3-193263, the joint portion 25 of the transmission shaft is formed of one universal joint. It is difficult to quickly attach and detach the fitting portion 26 at the lower end of the shaft and the fitting hole 10a at the upper end of the nozzle handle portion 10.

The present invention has been made in view of the above circumstances, and in particular, has improved the electric control device of the stopper for the casting nozzle described in Japanese Patent Application Laid-Open No. 3-193263, and has a simple structure for the weight and heat of the molten metal. Even when the gutter is deformed and the center axis of the fitting portion at the lower end of the transmission shaft and the fitting hole at the upper end of the nozzle handle are misaligned, the attachment / detachment is facilitated.
Provided is a controller for a continuous or semi-continuous casting stopper which can operate a number of nozzle stoppers simultaneously or independently, and can control the nozzle stopper opening degree so as to keep the level of the molten metal in each mold constant. The purpose is.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention has a drive motor on the upper part, and a square shaft connected to a lower output shaft of the drive motor extends into a cylindrical guide case. A transmission shaft for transmitting a rotational force is fitted to the shaft so as to be slidable in the vertical direction, and a square fitting portion at the lower end of the transmission shaft is screwed to the nozzle at the upper portion of the nozzle stopper screwed to the support. An electric control device of a nozzle stopper used for a continuous or semi-continuous casting nozzle configured to be able to drop into a square fitting hole provided at an upper end of a handle portion, wherein a lower end portion of the transmission shaft has a compression coil spring on an outer periphery. 24 and the intermediate member 2
5c to form a double universal joint having
The intermediate member 25c of the two universal joints is inclined so that the lower end of the transmission shaft, which is parallel to the transmission shaft in the vertical direction, is provided at the upper end of the nozzle handle above the nozzle stopper. It is characterized in that it is configured so that it can be dropped and fitted into a fitting hole whose position is shifted.

[0008]

Next, the operation of the present invention will be described. When a continuous or semi-continuous casting is started, a support supporting a large number of nozzle stoppers is connected to a tan with the tip of the plug body of the nozzle stopper leading to the nozzle. Rotate immediately above a number of openings provided in the dish or gutter bottom, pull down the transmission shaft from the guide case, and fit a square fitting at the lower end of the nozzle at the top of the nozzle stopper screwed to the support. It fits into the square fitting hole provided at the upper end of the handle part. At this time, even if the gutter is deformed due to the weight or heat of the molten metal and the center axis of the transmission shaft and the nozzle stopper is displaced, the lower end of the transmission shaft is formed of two universal joints having the intermediate member 25c. Even if the lower end of the transmission shaft is bent above and below the intermediate member 25c and the intermediate member 25c is inclined, the upper and lower members 25a and 25b of the two universal joints can be parallel in the vertical direction. The fitting portion is easily and accurately fitted into the square fitting hole in which the positions of the center axes of the transmission shaft and the nozzle stopper are misaligned with each other. The stopper and the stopper are detachably connected.

Thereafter, when the drive motor is driven to rotate, the rectangular shaft is rotated by the torque of the drive motor via the torque limiter, and the transmission shaft, which is slidably mounted on the square shaft in the vertical direction, is further rotated. Due to the rotation, the nozzle stopper in which the quadrangular fitting portion at the lower end is dropped and fitted is rotated via a double universal joint portion having a compression coil spring on the outer periphery. Therefore, at the start of casting or at the end of casting, each nozzle stopper screwed to the support by each drive motor is smoothly rotated via a double universal joint portion having a compression coil spring on the outer periphery, and the tundish is rotated. Alternatively, a number of nozzle openings at the bottom of the gutter are simultaneously closed or opened. Further, when the molten metal is being poured at the time of casting, the drive motor is controlled so as to keep the level of the molten metal in each mold constant by the signal of the molten metal level sensor provided in each mold, and the nozzle stopper is independently controlled. Operate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electric control device for a stopper for a continuous casting nozzle according to the present invention will be described with reference to the drawings. 1 to 3 show one embodiment of the present invention.
FIG. 2 shows a state where the electric control device and the nozzle stopper are connected, and FIG. 3 shows a state where the connection between the two is disconnected and the transmission shaft is housed in the guide case. In the figure, a two-hole immersion nozzle 1 has a cylindrical jet port 2 along the center line of a section perpendicular to the casting direction, and the immersion nozzle 1 is attached to the bottom of a gutter 4. A hole 4a drilled at the bottom of the gutter 4 communicates with the flow passage 1a communicating with the jet port 2. Alternatively, the upper part of the hole 4a, that is, the bottom part of the gutter 4 is a funnel-shaped valve seat 4b.
Is formed.

On the other hand, a nozzle stopper 7 for opening or closing the valve seat 4b has a plug body 8 made of a carbon material at the tip, an intermediate part having a male screw part 9 formed, and a plurality of rods on the upper part. And a handle portion 10 having a protruding portion 10a, and a square fitting hole 10b is formed in an upper portion thereof. The male screw portion 9 is provided with the nozzle stopper 7.
Is screwed to a female screw portion 12 provided on the horizontal rod 11a of the support 11 holding the support. The support 11 is rotated about the point P by the hydraulic cylinder 13. Reference numeral 3a indicates the molten metal in the mold 3.

On the other hand, a plurality of stopper electric control devices A are provided on a gate-shaped fixing member (not shown) on the upper extension of the nozzle 1, respectively. The stopper electric control device A is provided with a drive motor 14 at an upper part, and an output shaft of the drive motor 14 is connected to a square shaft 16 via a torque limiter 15.
It is connected to. The rectangular shaft 16 has a circular cross section from the connection with the torque limiter 15 to the rotary bearing 17, and is rotatably supported on the housing 18 by the rotary bearing 17. The cross-sectional shape of the drive shaft 16 from the rotation bearing 17 to the tip is a triangle or a quadrangle.

The lower part of the housing 18 is a guide case 19, both of which have a double structure filled with a heat insulating material in order to have heat resistance. 20 are provided. Further, a transmission shaft 22 made of a stainless steel hollow tube is connected to the square shaft 16 via an up / down bearing 21 which transmits a rotational force and can slide up and down. It is a double-structured tube with a heat insulating material inside to make it more versatile. A circular handle 23 protrudes from a lower portion of the transmission shaft 22, and a lower end of the circular handle 23 is provided at an upper end of the upper handle portion 10 of the nozzle stopper 7 through a universal joint 25 around which a compression coil spring 24 is wound. A square fitting portion 26 is provided to project into the square fitting hole 10b. This universal joint 25
Are two universal joints 25a, 25b, 2
5c.

Next, the operation of this embodiment will be described.
When continuous casting is started, a support 11 supporting a large number of nozzle stoppers 7 is connected to a funnel-shaped valve seat provided at the bottom of a gutter 4 that connects the tip of a plug body 8 of the nozzle stopper 7 to the nozzle 1. When it is rotated just above 4b, the electric control device A of the stopper, the nozzle stopper 7, and the nozzle 1 are positioned on a vertical line. Thereafter, the circular handle 23 is removed from the rotation stopper 20 and the transmission shaft 22 is connected to the guide case 19.
Then, the lower end of the square fitting portion 26 is dropped and fitted into a square fitting hole 10b provided at the upper end of the nozzle handle portion 10 above the nozzle stopper 7.

When the fitting portion 26 is dropped into the fitting hole 10b and fitted, even if the gutter is deformed by the weight or heat of the molten metal and the position of the center axis of the transmission shaft 22 and the nozzle stopper 7 is displaced, As shown in FIG. 4, the lower end of the transmission shaft is formed of two universal joints 25a, 25b, and 25c having an intermediate member 25c. Therefore, the intermediate member 25c is bent by bending the intermediate member 25c up and down. Even two upper and lower members of a universal joint 25
Since a and 25b can be parallel in the up and down direction, the square fitting portion 26 at the lower end of the transmission shaft 22 is easily fitted into the fitting hole 10b, and is made linear by the compression coil spring 24 as shown in FIG. When the drive motor 14 is rotationally driven in this state, the drive shaft 16 is rotated by the torque of the drive motor 14 via the torque limiter 15, and the torque is transmitted to the transmission shaft 22 by the vertical bearing 21, and the compression coil Since the fitting portion 26 at the lower end is rotated via the joint portion 25 composed of two universal joints around which the spring 24 is wound, the nozzle stopper 7 is smoothly rotated, and the female screw portion 12 of the horizontal portion 11a of the support 11 is rotated. As a result, the nozzle stopper 7 rotates downward, and the nozzle plug 8 closes the valve seat 4b. Further, when the square fitting portion 26 is fitted into the fitting hole 10b, even if the compression coil spring 24 does not make the transmission shaft 22 completely straight as shown in FIG. The entire universal joint is immediately completely straightened by the rotational force and the force of the compression coil spring 24.

In the closed state, the molten metal is poured into the tundish or the gutter 4 and when a certain amount is reached, the respective drive motors 14 are rotated in reverse to rotate the nozzle stoppers 7 simultaneously upward and fully open. Nozzle 1 to mold 3 as state
The molten metal is supplied to the mold 3 to start continuous drawing of the slab solidified in the mold 3 downward. At this time, the compression coil spring 2
4, the universal joint 25 has a restoring property. Therefore, even if the gutter 4 is deformed by the weight or heat of the molten metal and the center of the transmission shaft 22 and the nozzle stopper 7 is shifted, it is impossible for the drive shaft 16 and the transmission shaft 22 to move. With no force applied, the rotation of the drive motor 14 is smoothly connected, and the nozzle stopper 7 can be smoothly rotated.

Thereafter, each drive motor 14 is controlled by a not-shown level sensor provided on each mold 3 so as to keep the level constant, so that each nozzle stopper 7 is operated independently, and The opening of the nozzle stopper 7 can be held at an appropriate amount. At the end of the casting, the nozzle stoppers 7 are simultaneously operated to bring the nozzles 7 to the fully closed state.

Further, according to the present embodiment, troubles such as breakout and nozzle blockage during operation, and troubles in normal operation such as failure of the electric motor are difficult, or urgent due to operational reasons. The electric control device A is quickly retracted, and when manual control is necessary, the circular handle 23 below the transmission shaft 22 is lifted to quickly disconnect the electric control device from the fitting hole 10b of the nozzle stopper 7, and the upper guide case 19 can be quickly stored. Moreover, according to this embodiment, even when the electric control device is disconnected as described above, the rod 1
By operating the fishing rod 27a with the fishing rod 27, the opening degree of the nozzle stopper 7 can be controlled or closed.

[0019]

According to the present invention described above, in the electric control device of the nozzle stopper, the transmission shaft is fitted to the square shaft so as to be slidable up and down to transmit the rotational force of the drive motor. The lower end of the transmission shaft is formed as a double universal joint having a compression coil spring 24 on the outer periphery and having an intermediate member 25c.
A fitting portion at the lower end of the transmission shaft, which is made to be parallel to the transmission shaft in the vertical direction by inclining the intermediate member 25c of the universal joint, is provided at the upper end of the nozzle handle at the upper part of the nozzle stopper. The lower end of the transmission shaft is in the middle even if the gutter is deformed by the weight or heat of the molten metal and the center axis of the transmission shaft and the nozzle stopper is displaced because it can be dropped and fitted into the shifted square fitting hole. It consists of two universal joints having a member 25c. Even if the intermediate member 25c is bent by bending the intermediate member 25c up and down to incline the intermediate member 25c, the upper and lower members 25a and 25b of the two universal joints are parallel in the vertical direction. Therefore, the square fitting portion at the lower end of the transmission shaft, which is parallel to the transmission shaft in the vertical direction, can be easily inserted into the fitting hole. It can be accurately fitted narrowing down, therefore easily and the transmission shaft and to absorb the positional deviation of the center axis transmission shaft and nozzle stopper and nozzle stopper, and can be safely detachably connected. In addition, at this time, the two universal joints have a restoring property by the compression coil spring, so that when the transmission shaft is rotated, the rotation force and the force of the compression coil spring immediately cause the rotation of the transmission shaft.
The entire universal joint is completely straight, and no excessive force is applied to the square shaft and transmission shaft.The rotation of the drive motor is transmitted smoothly and the nozzle stopper can be rotated smoothly, so during casting The molten metal supply amount can be accurately and quickly controlled, and when continuous casting is performed thereon, the nozzle stopper can be operated by a drive motor to simultaneously bring all the nozzles into a fully closed state or a fully opened state.

Further, even when the transmission shaft is removed during casting and manual control is urgently required, the transmission shaft can be quickly and reliably separated. It is possible to prevent a serious trouble such as an excessive amount of the molten metal from overflowing from the mold. In addition, in case of troubles such as breakout or nozzle clogging, troubles in which rotation of the transmission shaft and nozzle stopper becomes impossible, a heavy load will be applied to the electric motor, damage or trouble of the electric motor, etc. Quickly transfer the transmission shaft from the nozzle stopper,
And safe operation is possible because it can be reliably separated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a use state of the present embodiment.

FIG. 2 is a longitudinal sectional view showing a state where the present embodiment is connected to a nozzle stopper.

FIG. 3 is a vertical cross-sectional view showing a separated state.

FIG. 4 is a vertical cross-sectional view of a joint portion when a shaft center is shifted.

FIG. 5 is a longitudinal sectional view of the restored joint portion.

FIG. 6 is a side sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 3 Mold 4 Gutter 7 Nozzle stopper 8 Plug part 10 Handle part 10b Fitting hole 11 Support 14 Drive motor 16 Square shaft 19 Guide case 20 Rotation stopper 22 Transmission shaft 23 Circular handle 24 Compression coil spring 25 Universal joint 26 Fitting part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takashi Shimada 3 Kurami-cho, Samukawa-cho, Koza-gun, Kanagawa Japan Minami Kurami Plant (56) References JP-A-3-193263 (JP, A) JP-A-55 -42761 (JP, A) JP-A-58-163824 (JP, A) Japanese Utility Model Application Laid-open No. Sho 62-94940 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A drive motor is provided at an upper part, and a rectangular shaft connected to a lower output shaft of the drive motor is extended in a cylindrical guide case, and a transmission shaft for transmitting a rotational force is vertically mounted on the shaft. The transmission shaft is slidably fitted in the direction, and the square fitting portion at the lower end of the transmission shaft is dropped into the square fitting hole provided at the upper end of the nozzle handle portion above the nozzle stopper screwed to the support. In the electric control device of the nozzle stopper used for the continuous or semi-continuous casting nozzle configured so as to be able to perform, the lower end portion of the transmission shaft
Is provided with a compression coil spring 24 on the outer periphery thereof, and
formed in duplicate universal joint with c, the
Inclined intermediate member 25c of two universal joints
The transmission shaft in parallel with the transmission shaft in the vertical direction.
Insert the fitting at the lower end of the shaft with the
Are provided at the upper end of the
An electric control device for a stopper for a casting nozzle, characterized in that it can be dropped and fitted into a fitted fitting hole .