KR102163553B1 - Tundish Slide Gate Device with Improved Structure - Google Patents

Abstract

A tundish slide gate apparatus for adjusting a flow rate of molten steel in a continuous casting process according to the present invention comprises: an upper cover having a spring cartridge or a jig to maintain pressure in an up and down direction; a body complete connected to the upper cover by a bolt or a plurality of coupling units, and having an immersion nozzle fixated to a lower part thereof; a slide unit arranged between the upper cover and the body complete to adjust a flow rate of molten steel in the immersion nozzle; and an immersion nozzle exchange cylinder exchanging and moving the immersion nozzle. The slide unit includes: an upper fixation plate and a lower fixation plate both of which have a hole; a slide plate arranged between the upper fixation plate and the lower fixation plate to horizontally move and communicate with the holes; and a flow rate adjustment cylinder horizontally moving the slide plate. The immersion nozzle exchange cylinder can change positions while being arranged at both sides on the same axial line to easily exchange the immersion nozzle.

Description

Tundish Slide Gate Device with Improved Structure}

The present invention relates to a tundish slide gate device in a continuous casting process for manufacturing metal casts such as blooms, billets, and slabs, and more particularly, to a tundish slide gate device that improves usability and durability by improving the structure and material. About.

The continuous casting process refers to a process in which molten metal, that is, molten steel (melted metal) is injected into a mold and cooled while continuously manufacturing metal casts such as blooms, billets, or slabs. The molten steel is injected into the mold from the ladle and tundish through the immersion nozzle. The flow of molten steel flowing into the mold and the initial solidification process are one of the factors that determine the quality of the continuous casting completed metal cast.

For example, when molten steel directly falls into the mold and flows into the mold, the penetration depth becomes deep, so that the formation of a solidification layer under the mold becomes unstable, and the supply of molten steel to the molten steel surface may not be smooth, resulting in a problem that the molten steel surface solidifies. On the other hand, if there is a strong floating flow in the molten steel in the direction of the hot water surface, the hot water surface becomes unstable and the formation of a solidified layer on the hot water surface becomes non-uniform, which may deteriorate the quality of the metal cast.

It is very important to control the flow of molten steel as described above, and for this purpose, efforts to control the flow of molten steel in the mold by improving the structure or control method of the immersion nozzle are continuing.

In particular, the Tundish Slide Gate, which plays a role of controlling and supplying molten steel during the manufacturing process, discharges molten steel to the bottom according to the opening operation, and passes through the mold through the immersion nozzle (SEN), and the bending device ( Bending Device) and continuously produced through such a process are cut to a certain length by a torch cutter and transferred to the product yard through a roller table.

As such, for continuous production, the immersion nozzle must be replaced after a certain period of use, and the immersion nozzle exchange is performed by changing the hydraulic cylinder forward/backward (replacement time about 4 to 5 seconds).

By the way, the fastening structure of the tundish slide gate for the exchange of the immersion nozzle is provided in a cantilever bar type, and the exchange is carried out by pulling the immersion nozzle, so that the force of the cylinder is distributed and the cylinder must be fixedly attached to the tundish slide gate. Accordingly, a lot of related components or parts are required. In this way, there is a problem that the asymmetry of cylinder mounting and the complicated structure, usability and durability are deteriorated due to other additional configurations.

In addition, when replacing the SEN, the immersion nozzle is caught in the exchange guide in the slide gate space, causing intermittent problems such as inability to replace and interruption of operation, and may cause inoperability due to deformation of the hydraulic cylinder rod.

In addition, since the main frame of the tundish slide gate is made of molten welded steel (SS400) due to its complicated structure or shape, there is a problem that premature deformation and welding stress occur.

Registered Patent No. 10-1916811 (announced on November 08, 2018)

The present invention has been conceived in view of the above-described problems, and an object of the present invention is to provide a tundish slide gate device with improved usability and durability by improving the structure and material of the tundish slide gate device.

The tundish slide gate device for adjusting the molten steel flow rate in the continuous casting process according to the present invention is connected to the upper cover by an upper cover, a bolt, or a plurality of fastening means for maintaining pressure in the vertical direction provided with a spring cartridge or jig. A body compact to which an immersion nozzle is fixed to a lower portion, a slide unit provided between the upper cover and the body compact to adjust the molten steel flow rate of the immersion nozzle, and an immersion nozzle exchange cylinder for exchanging and moving the immersion nozzle, and the slide The unit includes an upper fixing plate having a hole, a lower fixing plate, a slide plate provided between the upper fixing plate and the lower fixing plate and horizontally moving, and a flow control cylinder for horizontally moving the slide plate and a slide plate provided to communicate with the hole. do.

In particular, the present invention is characterized in that the position of the immersion nozzle exchange cylinder can be changed, but is provided on both sides of the same axis to facilitate exchange of the immersion nozzle.

In addition, at least one of the upper cover, the slide unit, and the body compact is provided with a material having a tensile strength of 480 N/mm2 or more, but is preferably made of an SC49 material according to the KS standard.

In addition, the immersion nozzle exchange cylinder is detachable but is provided in a symmetrical type compatible with the X-Y axis, thereby improving usability and durability, and further including a separate cylinder suspension configuration to facilitate replacement.

In addition, a fastening means or a locking means is further provided so that the immersion nozzle exchange cylinder can be firmly mounted when the immersion nozzle exchange cylinder is attached or detached.

In addition, it further includes a sensor unit that checks the status and life information of the immersion nozzle and an alarm unit that informs the user of the information confirmed by the sensor unit, and the user can attach/detach the immersion nozzle replacement cylinder according to the information. It is characterized in that to determine.

In addition, the information is stored and processed in a database, and by using deep learning or machine learning technology, the information is predicted and the information about the replacement timing of the immersion nozzle is predicted and the user is alerted.

The tundish slide gate device according to the present invention can improve usability and durability by improving the mounting structure of the immersion nozzle exchange cylinder and using a material having excellent tensile strength.

1 is a perspective view of a tundish slide gate device according to the present invention,
2 is a plan view of a tundish slide gate device according to the present invention,
3 is a side view of a tundish slide gate device according to the present invention;
4 is a cross-sectional view AA′ of the tundish slide gate device according to FIG. 2;
5 is an exploded perspective view of a tundish slide gate device according to the present invention,
6 is an explanatory image of a tundish slide gate device according to the present invention.

Hereinafter, with reference to the accompanying drawings, a tundish slide gate device according to an embodiment of the present invention will be described in detail so that those of ordinary skill in the art can easily implement it. The present invention is not limited to the embodiments described herein, and may be implemented in various different forms. In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are attached to the same or similar components throughout the specification.

Throughout the specification of the present invention, molten metal and molten steel refer to a liquid state in which metal is melted during casting. Since it refers to a state in which the metal is dissolved, it is solidified after cooling to change into a metal cast. In this case, the metal cast may be a slab, bloom, or billet. Specifically, when casting steel, the molten metal may refer to molten steel.

Continuous casting is a method of continuously solidifying molten metal into a mold while cooling it. Billets, blooms, and beam blanks are produced. Billets are reinforced and small-sized section steels, and blooms are medium-sized section steels and beam blanks. Becomes the material of the H-beam.

The molten metal, that is, molten metal, is continuously poured into the mold (mold, frame) and solidified to produce a plate, rod, wire, and pipe for use. In continuous casting, pouring continuously from the top of the water-cooled mold and subtracting the bottom of the mold The next hardened ingot can be continuously pulled downward to produce long metal casts ranging from several meters to tens of meters.

Hereinafter, in the description, the x-axis, y-axis, and z-axis are not limited to three axes on a Cartesian coordinate system, but may be interpreted in a broad sense including them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

In general, a tundish slide gate 1 is installed at the bottom of a ladle containing molten steel in a continuous casting process to control the flow rate of molten steel flowing out to the tundish. The slide gate is disposed in a state in which the slide plate and the upper and lower plates each having holes formed therein so as to serve as valves are in surface contact. That is, while the plate slides, the hole is communicated to form an opening, through which the molten steel of the immersion nozzle can flow out.

In addition, the fixed plate and the slide plate are fixedly installed on the fixed frame and the slide frame, respectively. In more detail, these slide gates are kept in a closed state, where each hole formed on the fixed plate and the slide plate are located on different axes in normal times, and when the hydraulic cylinder connected to the slide frame is operated, the hydraulic cylinder is pushed. When the rod moves the slide frame horizontally and moves the slide plate together, when the three holes formed in the fixed plate and the slide plate coincide with each other, it is opened and the molten steel contained in the tundish is discharged.

That is, the moving distance of the slide frame is adjusted according to the advancing length of the push rod of the hydraulic cylinder, and the degree of opening of the holes formed in the fixing plate and the slide plate is adjusted together, so that the discharge flow rate of molten steel contained in the tundish can be adjusted.

It prevents molten steel from leaking between the plate and the plate by allowing surface pressure to be generated while the fixed plate and the slide plate are in contact with each other. And to stop the discharge flow rate of molten steel contained in the tundish, operate the hydraulic cylinder and move the push rod in the opposite direction, and the slide plate together with the slide frame slides to the initial position while in contact with the surface and moves to the initial position. Lower Plate) and the hole of the slide plate are closed while being located on the other axis to stop the discharge of molten steel.

In this way, as the slide plate of the slide unit or the slide frame moves, the flow rate of the immersion nozzle 410 for moving the molten steel between the tundish and the mold is controlled, and the immersion nozzle prevents the molten steel from contacting the atmosphere so that the molten steel is property. It is possible to minimize the content of non-metallic inclusions in the cast steel by suppressing the formation.

The configuration of the tundish slide gate device 1 is largely composed of an upper cover 100, a slide unit 200, and a body compact 300 based on the attachment standard of the tundish bottom, and at the same time, an upper cover to apply surface pressure. The spring cartridge 120 and the spring are fixed to 100, and the body compact 300 is connected together with the slide frame 231.

The surface pressure is applied to the upper cover 100 by pressing the same pressure through a separate pressing jig and pressing toward the upper cover and the body compact by the outward elastic force of the coil spring to generate surface pressure. At this time, the surface pressure pressurization jig is a movable hydraulic device that applies constant pressure to both cartridges, compresses the coil springs to the same value, and then 4 bolts are connected to the body compression in the upper cartridge to maintain the surface pressure.

With this surface pressure applied, the slide plate can slide and move in close contact with the fixed plate. And the immersion nozzle for moving the molten steel between the tundish and the mold is fixed by applying a certain pressure by the leaf spring to the lower part of the body compact to prevent the molten steel from re-oxidizing.

1 is a perspective view of the tundish slide gate device 1 according to the present invention. As shown, the tundish slide gate is provided between the tundish and the immersion nozzle 410 to control the amount of molten steel permeation of the immersion nozzle. Functions. Hereinafter, a means for performing a gate role and a device, unit, system, etc. including the same may be used interchangeably with the same meaning.

In particular, while the conventional tundish slide gate device is a single cylinder, that is, the immersion nozzle exchange cylinder connected to the immersion nozzle is connected in a cantilever type and is a fixed type that cannot be attached and detached, the tundish slide gate device 1 according to the present invention The immersion nozzle exchange cylinder 400 may be provided by replacing it so as to be symmetric on both sides, and it is possible to attach and detach the device.

Therefore, unlike the conventional tundish slide gate device, which requires a number of parts to fix the immersion nozzle exchange cylinder, and is not symmetrical as it is an outer arm beam type, vibration and stability problems occur, the tundish according to the present invention The slide gate device can increase safety and durability.

In the slide gate device according to the present invention, the immersion nozzle exchange cylinder 400 can be mounted on the same axis so that both sides are symmetrical, and the usability and durability of the tundish slide gate device are improved by enabling detachment rather than a fixed method. Let it. Accordingly, since the configuration of the fixing device is omitted, the structure is simplified, and the tundish slide gate device can be efficiently operated according to the user's needs or preset conditions.

As shown, the tundish slide gate device 1 for controlling the flow rate of molten steel in the continuous casting process according to the present invention is provided with a spring cartridge or a jig to maintain the pressure in the vertical direction, the upper cover 100, bolts or plural The body compact 300 is connected to the upper cover 100 and the immersion nozzle 410 is fixed to the lower portion by a fastening means of the immersion nozzle provided between the upper cover 100 and the body compact 300 It includes a slide unit 200 for adjusting the molten steel flow rate of 410 and an immersion nozzle exchange cylinder 400 for exchanging and moving the immersion nozzle.

The slide unit 200 is provided between the upper fixing plate 210, the lower fixing plate 220, and the upper fixing plate 210 and the lower fixing plate 220 in which a hole is formed to move horizontally and communicate with the hole. It includes a slide plate 230 provided and a flow rate control cylinder 240 for horizontally moving the slide plate.

In particular, the immersion nozzle exchange cylinder 400 according to the present invention allows the mounting position to be changed, but can be provided on both sides of the same axis and can be changed according to a user's selection or a preset standard. As shown, although the immersion nozzle exchange cylinder is provided on only one side, it can be mounted in a symmetrical position when necessary or according to a preset standard.

2 and 3 are plan and side views of the tundish slide gate device 1 according to the present invention. The immersion nozzle exchange cylinder 400 needs to be fixed to the tundish slide gate device or the body compact 300. Therefore, it can be seen that parts for fixing are omitted. That is, the structure is simplified, and through this, it is possible to change the material to be described later.

That is, unlike the conventional method in which the immersion nozzle exchange cylinder must be attached to the cassette, the problem of premature deformation of the cassette and spring can be very effectively reduced by providing it in a form that is detachable from the cassette.

Any one or more of the upper cover 100, the slide unit 200, and the body compact 300 may be made of a material having a tensile strength of 480 N/mm2 or more, and is preferably made of an SC49 material according to KS standards. .

That is, the conventional tundish slide gate device has a complex structure by various parts, and accordingly, it is provided with SS400 based on KS, which is a general structural steel. Accordingly, there is a problem in that an early deformation problem occurs and a welding stress occurs. Therefore, by providing the SC49 material, it has excellent tensile strength, durability, and easy disassembly and inspection.

The immersion nozzle exchange cylinder 400 is detachable, but is provided in a symmetrical type compatible with the X-Y axis, thereby improving usability and durability, and further including a separate cylinder suspension configuration to facilitate replacement.

Figure 4 is a cross-sectional detail view of the AA' axis in the flatness of Figure 2, as shown, the immersion nozzle 410 is the flow rate of molten steel is adjusted by the slide unit 200, the immersion nozzle is the body com The plate 300 is fixed by applying a certain pressure by the elastic member 310 provided under the plate 300, thereby preventing the molten steel from being re-oxidized.

In addition, as shown in FIG. 4, the elastic member 310 is provided in the form of a leaf spring, but may be deformed into another form for reducing vibration, and further, a vibration reducing device may be further provided. That is, an elastic member 310 provided under the body compact 300 to fix the immersion nozzle at a constant pressure of 0.15 bar or more, and a vibration reduction device for reducing vibration of the elastic member may be further provided.

A fastening means or a locking means (not shown) may be further provided so that the immersion nozzle replacement cylinder 400 can be firmly mounted when the immersion nozzle replacement cylinder 400 is detached, and if necessary, a sensor that checks the detachable state and the fastening degree of the immersion nozzle replacement cylinder More (not shown) may be provided. The sensor may use a physical measurement, for example, a displacement sensor that checks the position of the immersion nozzle and the cylinder with infrared rays, or checks the proximity of the immersion nozzle.

5 is a detailed exploded view of the tundish slide gate device according to the present invention, including an upper cover, a slide unit, a body compact, and an immersion nozzle exchange cylinder provided on a side surface. Of course, this configuration is not limited to all illustrated configurations, and may be omitted or changed and substituted if necessary.

6 is an image illustrating the operation of the tundish slide gate device according to the present invention. As shown in the figure, the cylinder can be detachably mounted at a position symmetrical with the push direction of the immersion nozzle exchange cylinder. The capacity of molten steel can be controlled by horizontal movement of the included slide unit.

In addition, it may further include a sensor unit (not shown) to check the state and life information of the immersion nozzle and an alarm unit to inform the user of the information confirmed by the sensor unit, the user exchanges the immersion nozzle according to the information The timing and location of cylinders can be determined.

In addition, the information is stored and processed in a database, and by using deep learning or machine learning technology, the information can be predicted and alarmed to the user when the immersion nozzle is exchanged.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and simple substitutions, modifications, and changes within the technical spirit of the present invention will be apparent to those of ordinary skill in the art.

The tundish slide gate device according to the present invention can be used in a tundish slide gate device having improved usability and durability by improving the structure and material.

1: tundish slide gate device 100: top cover
110: upper cover axle 120: spring cartridge cover
200: slide unit
210: upper fixing plate 220: lower fixing plate
230: slide plate 231: slide frame
240: flow control cylinder (slide drive) 250: cylinder bracket
260: cylinder extension 270: cylinder guide
300: body complete 310: elastic member
400: immersion nozzle exchange cylinder 410: immersion nozzle
420: cylinder slide plate 430: cylinder cover

Claims (6)

In the tundish slide gate device that controls the flow rate of molten steel in a continuous casting process,
An upper cover provided with a spring cartridge or a jig to maintain pressure in the vertical direction;
A body compact connected to the upper cover by bolts or a plurality of fastening means and fixed to the immersion nozzle at the lower part;
A slide unit provided between the upper cover and the body compact to adjust the molten steel flow rate of the immersion nozzle;
An immersion nozzle exchange cylinder for exchanging and moving the immersion nozzle;
A sensor unit that checks state and life information of the immersion nozzle so that the user determines the timing and position of the immersion nozzle replacement cylinder; And
An alarm unit notifying a user of the information checked by the sensor unit; It further includes,
The slide unit includes an upper fixing plate having a hole, a lower fixing plate, and a slide plate provided between the upper fixing plate and the lower fixing plate and horizontally moving, and a flow control cylinder for horizontally moving the slide plate and the slide plate provided to communicate with the hole. Including,
The position of the immersion nozzle exchange cylinder can be changed, but provided on both sides of the same axis and changed according to the user's selection or preset criteria. By providing, usability and durability are improved, and a separate cylinder suspension configuration is further included to facilitate replacement, and a fastening means or a locking means is further provided so that the immersion nozzle exchange cylinder can be firmly mounted when detaching and detaching the
Tundish slide gate, characterized in that the position of the immersion nozzle and the cylinder are checked by infrared rays to check the detachment state and the degree of fastening of the immersion nozzle exchange cylinder, and whether proximity between each component is checked using a displacement sensor. Device.
The method of claim 1,
Tundish slide gate device, characterized in that at least one of the upper cover, the slide unit and the body compact is made of a material having a tensile strength of 480 N/mm2 or more, but is made of a SC49 material according to KS standards.
delete delete delete The method of claim 1,
The information is stored and processed in a database, and by using deep learning or machine learning technology, the information is predicted and alarmed to the user when the immersion nozzle is exchanged.

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