JPH0744362Y2 - Support device for electric control device of stopper for casting nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a casting immersion nozzle for supplying molten metal to a mold having an open upper end, which is used when continuously or semi-continuously casting a metal or alloy slab. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting device for an electric control device for a stopper for electric power, and more particularly to a supporting device for an electric control device for a stopper for an immersion nozzle, which is suitable for a continuous casting method for supplying molten metal to a mold having a large number of strands.

[Conventional technology]

Continuous or semi-continuous casting method (hereinafter referred to as continuous casting method) is the molten metal in the tundish, or the molten metal discharged from the melting furnace into the gutter is poured into a water-cooled copper mold and cooled in the mold to solidify the molten metal sequentially, It is a method of continuously pulling out a slab from a mold.

In order to stably cast slabs with few casting defects in the continuous casting method, heat must be uniformly removed in the mold, and sufficient mold flux to cover the upper part of the molten metal must be supplied to lubricate the mold and slabs. It is important to maintain the property and to prevent the entrainment of mold flux in the slab by keeping the amount of molten metal supplied to the mold constant.

Generally, as a continuous casting mold, a short penetrating mold composed of a pair of opposed mold short pieces and a pair of long mold pieces is used.

When the molten metal is supplied from the tundish or the gutter into the mold, 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 jet nozzle shapes of this immersion nozzle, and a nozzle suitable for the type of molten metal to be cast and the shape of the mold is used. For example, when casting a copper-based alloy slab slab by the continuous casting method, the inverted T-shaped nozzle shown in FIG. 1 is used because of the casting surface of the slab and the occurrence of pinholes inside the slab. It is generalized.

This nozzle 1 generally has a cylindrical jet port 2 along the center line of the vertical cross section in the casting direction. The jet port 2 is a tundish so that the molten metal jets in parallel to the long side of the mold 3. Or it is attached to the gutter 4.

A nozzle stopper 5 is provided for the nozzle 1 as shown in FIG. 5, and the conventional nozzle stopper 5 is operated up and down by an air cylinder or a hydraulic cylinder 6 attached to a tundish or a gutter 4. It has become so.

Further, as this type of apparatus, there are JP-A-46-4358 and JP-A-
Those described in JP-A-46-5501, JP-A-49-92631, JP-A-50-142432 and the like are known.

[Problems to be Solved by the Invention] However, in any of the above-mentioned conventional nozzle stopper control devices, the nozzle stopper is directly moved in the vertical direction by the air cylinder or the hydraulic cylinder to open and close the nozzle to control the molten metal supply amount. Because it does
If the tundish or gutter bends downward due to the weight and high heat of the molten metal, and the centers of the nozzle and nozzle stopper are misaligned, there is a problem that it is not possible to control the uniform supply of molten metal to each mold. It was

Further, at the start of casting and at the end of casting, it is necessary to quickly open the nozzle stopper or fully close it, or there is a drawback that a conventional control device causes some time lag,
Especially, it is necessary to remove the metal remaining in the gutter after the casting with a crane, but the conventional control device has a structure that hinders the removal work.

Furthermore, in the conventional controller, when the number of strands (the number of ingots that are cast at the same time) becomes large, it is important to keep the molten metal surface 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 fluctuations in the molten metal surface in each mold lead to intensification of molten metal convection, resulting in deterioration of the quality of the slab due to the inclusion of flux.

The present invention has been made in view of the above circumstances, and has a simple structure and can easily withdraw a large number of nozzle stoppers simultaneously or independently, which facilitates metal removal work after casting is completed. It is an object of the present invention to provide a support device for a stopper control device for a continuous casting nozzle.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is used in a continuous or semi-continuous casting immersion nozzle, and has a male threaded portion of a nozzle stopper composed of a plug body section at the tip, a male threaded section in the middle, and a rotary operation section at the top. Is a supporting device of an electric control device of a nozzle stopper screwed to a female screw portion provided on the horizontal rod of a vertically rotatable support body composed of a horizontal rod and a supporting rod, An electric control device for rotationally controlling the nozzle stopper is rotatably supported by a gate-shaped housing and has a drive motor on an upper part thereof. A drive shaft connected to a lower output shaft of the drive motor has a cylindrical guide. A transmission shaft that extends in the case and has a transmission shaft that transmits a rotational force is vertically slidably fitted to the drive shaft.
The lower end of the transmission shaft is characterized in that the lower end of the transmission shaft can be fitted into the fitting portion above the nozzle stopper, and is used for a continuous or semi-continuous casting nozzle. Each of the male screw portions of the plurality of nozzle stoppers composed of the male screw portion and the upper rotary operation portion is provided on the horizontal rod of the vertically rotatable support body composed of the horizontal rod and the supporting rod. A supporting device for an electric control device for a nozzle stopper screwed to each of a plurality of female screw parts, the electric control device controlling rotation of each nozzle stopper is rotatably supported by a gate-shaped housing, and is provided at an upper portion. Each drive motor is equipped with a drive shaft that is connected to the lower output shaft of each drive motor and extends inside a cylindrical guide case.The transmission shaft that transmits rotational force is transmitted to each drive shaft. Is configured to be slidable in the vertical direction, the lower end of each transmission shaft can be fitted into the fitting portion above the nozzle stopper by being fitted, and the drive motors are It is characterized in that it is configured to be controlled independently by a signal so that the molten metal level in each mold is kept constant.

[Action]

Next, the operation of the present invention will be described. When starting continuous casting, a support body that supports a large number of nozzle stoppers is provided on a tundish or a gutter bottom portion where the tip of the plug body portion of the nozzle stopper communicates with the nozzle. The transmission shaft is pulled down from the guide case, and the lower end of the transmission shaft is fitted into the fitting portion above the nozzle stopper.

When the drive motor is subsequently driven to rotate, the drive shaft is rotated by the rotational force of the drive motor, and the transmission shaft that is slidably fitted on the drive shaft in the vertical direction is also rotated. The fitted nozzle stopper is rotated.

Therefore, at the start of casting or at the end of casting, the nozzle stoppers screwed to the support by the drive motors simultaneously close or open a large number of nozzle openings in the tundish or the gutter bottom.

In addition, when the molten metal is being injected during casting, the drive motor is controlled by the signal of the molten metal level sensor provided in each mold so as to keep the molten metal in each mold constant, and each nozzle stopper is independent. To operate.

Further, after the casting is completed, the transmission shaft is pushed up and housed in a cylindrical guide case, and the electric control device rotatably supported by the gate-shaped housing is pivotally retracted upward, and then metal removal work is performed. do.

〔Example〕

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 an embodiment of the present invention, FIG. 2 shows a state in which an electric control device and a nozzle stopper are connected, and FIG. The shaft is shown stored in the guide case.

In the figure, a two-hole immersion nozzle 1 has a cylindrical ejection port 2 along the center line of a vertical cross section in the casting direction. The immersion nozzle 1 is attached to the bottom of a gutter 4, and the immersion nozzle 1 A hole 4a bored in the bottom of the gutter 4 communicates with the flow passage 1a leading to the jet port 2. Alternatively, the upper portion of the hole 4a, that is, the bottom portion of the gutter 4 is formed as a funnel-shaped valve seat 4b.

On the other hand, the nozzle stopper 7 that opens or closes the valve seat 4b has a plug portion 8 made of a carbon material at its tip, an intermediate portion having a male screw portion 9, and a plurality of rods at its upper portion.
The handle portion 10 is provided with a protruding portion 10a, and a square fitting hole 10b is formed in the upper portion. The male screw portion 9 is a support body that holds the nozzle stopper 7.
It is screwed to a female screw portion 12 provided on a horizontal rod 11a of the shaft 11. The support 11 is rotated by the hydraulic cylinder 13 about the point P.

Reference numeral 3a indicates the molten metal in the mold 3. On the other hand, in the gate-shaped housing B, a large number of electric stopper control devices A are rotatably provided on the upper extension of the nozzle 1. This stopper electric control device A has a drive motor 14 at the top.
The output shaft of the drive motor 14 is connected to the drive shaft 16 via the torque limiter 15. This drive shaft 16 has a circular cross section from the connection with the torque limiter to the rotating bearing 17,
The subsequent section has a triangular or quadrangular shape, and is rotatably supported by the housing 18 by the rotating bearing 17.

The lower part of the housing 18 is a guide case 19, both of which have a double structure in which a heat insulating material is filled to have heat resistance, and a rotation stopper 20 is provided at the lower end thereof via an arm. Has been.

Further, a transmission shaft 22 made of a stainless steel hollow tube is connected to the drive shaft 16 via an upper and lower bearing 21 that transmits a rotational force and can slide up and down,
This transmission shaft 22 is also a double-structured pipe having a heat insulating material inside for providing heat resistance. A circular handle 23 is provided on the lower portion of the transmission shaft 22, and a lower end of the circular handle 23 is provided with a joint portion 25 around which a coil spring 24 is wound.
A fitting portion 26 that is fitted into the rectangular fitting hole 10b formed in the upper handle portion 10 of the nozzle stopper 7 is provided so as to project.

Next, the operation of this embodiment will be described.

When starting the continuous casting, the support body 11 supporting a large number of nozzle stoppers 7 is provided with a funnel-shaped valve seat provided at the bottom of the gutter 4 in which the tip of the plug body portion 8 of the nozzle stopper 7 communicates with the nozzle 1. When it is rotated right above 4b, the electric control device A for the stopper, the nozzle stopper 7, and the nozzle 1 are positioned on the vertical line.

After that, remove the circular handle 23 from the rotation stopper 20,
The transmission shaft 22 is pulled down from the guide case 19, and the fitting portion 26 at the lower end thereof is dropped into and fitted into the fitting hole 10b of the nozzle handle portion 10.

When the drive motor 14 is rotationally driven in this state, the drive motor 14
The drive shaft 16 is rotated via the torque limiter 15 by the rotational force of 14, and the rotational force is transmitted to the transmission shaft 22 by the upper and lower bearings 21.
Since the fitting portion 26 at the lower end is rotated via 25, the nozzle stopper 7 is rotated at the same time, and the nozzle stopper 7 is rotationally moved downward by the female screw portion 12 of the horizontal portion 11a of the support body 11,
The nozzle plug portion 8 closes the valve seat 4b.

In the above closed state, the molten metal is discharged to the gutter 4, and when a certain amount is reached, the drive motors 14 are reversely rotated to rotate the nozzle stoppers 7 all at once upward, and the nozzles are fully opened to the mold 3. The molten metal is supplied through No. 1 and a certain amount of the molten metal is stored in the mold, and then solidified vertically downward to start the drawing of the slab.

After that, each drive motor is controlled so that the molten metal level is kept constant by an unillustrated molten metal level sensor provided in each mold 3.
Since the nozzles 14 are controlled, the nozzle stoppers 7 can be operated independently of each other, and the opening degree of each nozzle stopper 7 can be maintained at an appropriate amount. At the end of casting, each nozzle stopper 7
Can be operated all at once to be in a fully closed state.

Further, according to the present embodiment, when it is difficult to continue normal operation such as breakout or nozzle blockage during operation, or failure of the electric motor, or due to work convenience, the electric control device A is promptly operated. When retracting, the circular handle 23 under the transmission shaft 22 can be lifted to disconnect the electric control device from the fitting hole 10b of the nozzle stopper 7 and be housed in the upper guide case 19.

Moreover, according to the present embodiment, even when the electric control device is disconnected as described above, the rod 10a of the handle portion 10 is operated by the fishing rod 27 to control the opening degree of the nozzle stopper 7 or to close it. it can.

Further, after the casting is completed, the transmission shaft 22 is pushed up to be housed in the cylindrical guide case 19, and the electric control devices supported by the gate-shaped housing B are rotated and retracted upward, respectively, and then the metal removing work is performed. Alternatively, as shown in FIG. 4, the horizontal rod to which the electric control device of the gate-shaped housing B is attached is rotated and retracted upward by the motor m through the bevel gear to remove the metal.

[Effect of device]

According to the present invention described above, the transmission shaft is slidably fitted on the drive shaft to transmit the rotational force of the drive motor, and the lower end of the transmission shaft is dropped into the fitting portion above the nozzle stopper. Since it is fitted, when performing continuous casting, it is possible to operate the nozzle stopper by the drive motor to put all nozzles into the fully closed state or the fully opened state at the same time. The nozzle stoppers are independently controlled by the signals of the molten metal level sensors, so that the molten metal in each mold can be kept constant.

Also, in the case of operational troubles such as breakout and nozzle blockage, and failure of the electric motor, the transmission shaft can be quickly separated from the nozzle stopper, and safe operation can be performed.

Further, after casting, the transmission shaft is pushed up and housed in a cylindrical guide case, and the electric control device supported by the gate-shaped housing is rotated and retracted upward, after which the metal remaining in the gutter is removed. Can be performed easily and safely.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a side sectional view showing a usage state of the present embodiment, and 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 the same separated state, FIG. 4 is a perspective view showing a supporting state of this embodiment, and FIG. 5 is a side cross-sectional view of a conventional example. 1 ... Nozzle, 3 ... Mold, 4 ... Gutter, 7 ... Nozzle stopper, 8 ... Plug, 10 ... Handle, 10b ... Fitting hole, 11 ... Support, 14 ... Drive motor, 16 …… Drive shaft, 19 …… Guide case, 20 …… Rotation stopper, 22
...... Transmission shaft, 23 ...... Circular handle, 26 …… Insertion part, A …… Electric control device, B …… Gate type housing.

Claims (2)

[Scope of utility model registration request] 1. A nozzle for continuous or semi-continuous casting,
The male screw portion of the nozzle stopper composed of the plug portion at the tip, the male screw portion in the middle, and the rotating operation portion on the upper portion is the horizontal of the vertically rotatable support body composed of the horizontal rod and the supporting rod. A supporting device for an electric control device of a nozzle stopper screwed to a female screw portion provided on a rod, the electric control device controlling rotation of the nozzle stopper is rotatably supported by a gate-shaped housing, and has an upper portion. A drive shaft connected to the 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 slid on the drive shaft. A support device for an electric control device for a casting nozzle stopper, wherein the transmission shaft is movably fitted so that the lower end of the transmission shaft can be dropped and fitted into a fitting portion above the nozzle stopper. 2. Used in a continuous or semi-continuous casting nozzle,
A support body in which each male screw portion of a plurality of nozzle stoppers composed of a plug portion at the tip, a male screw portion in the middle, and a rotating operation portion on the upper portion is vertically rotatable and constituted by a horizontal rod and a supporting rod. Is a supporting device of an electric control device for a nozzle stopper screwed to a plurality of female screw portions provided on the horizontal rod, respectively, and the electric control device for controlling the rotation of each nozzle stopper is rotated in a gate-shaped housing. Supported as possible,
In addition, each drive motor is equipped with an upper part, and a drive shaft connected to the lower output shaft of each drive motor extends in a cylindrical guide case. It is slidably fitted in the direction, and the lower end of each transmission shaft is configured to be fitted into the fitting part above the nozzle stopper by fitting.
Each of the drive motors is configured to be independently controlled by a signal of a molten metal level sensor so as to keep the molten metal in each mold constant, and a supporting device for an electric control device for a stopper for casting nozzles. .