KR20180003754A - Water cooled stopper for tundish - Google Patents

Abstract

The present invention relates to a water-cooled stopper for a tundish, comprising: a cylindrical body formed in a vertical tube shape having a closed end and provided on a coaxial line with a melt inlet port (210) formed on a bottom surface of a tundish (200) A stopper body 110 for lifting and lowering the melt inlet 210 by opening and closing the melt inlet 210; A water supply passage 120 formed in a tubular shape having both ends open to be spaced apart from each other at a deep portion of the stopper body 110 and having a water supply port 121 formed at a rear end thereof to introduce cooling water; A drain line 130 provided in a space separated from the inner diameter portion of the water line 120 and the stopper body 110 and having a drain port 131 formed at the rear end thereof to discharge the cooling water; A heat insulating sheet 140 attached to an outer circumferential surface of the stopper body 110 to block heat transfer between the inside and outside of the stopper body 110; A hollow 151 having a predetermined depth corresponding to the outer diameter of the stopper body 110 is formed to be coupled with the stopper body 110 and a conical shape corresponding to a slope of the nozzle 220 provided at the melt inlet 210 The use of the refractory cap 150 having the opening and closing part 152 has an advantage that the service life of the stopper 100 can be remarkably extended as compared with the conventional art.

Description

{WATER COOLED STOPPER FOR TUNDISH}

The present invention relates to a water-cooled stopper for a tundish, and more particularly, to a stopper for controlling the flow rate of a molten material accommodated in a tundish of a continuous casting facility to a mold, The present invention relates to a water-cooled stopper for a tundish capable of eliminating various problems such as frequent replacement caused by direct exposure.

In general, the tundish of the continuous casting equipment used in the steelmaking process is designed to compensate for the difficulty in controlling the flow rate and temperature of the melt when the melts are directly injected into the mold from the ladle, which is a container for transferring the molten melt in the melting furnace Respectively. Therefore, the tundish stabilizes the melt while controlling the supply flow rate, speed and temperature of the melt, thereby allowing a smooth continuous casting process to proceed.

In a continuous casting facility, a schematic configuration of a tundish is described, wherein a tundish is provided in the form of a container of a predetermined size to accommodate the melt, and a plurality of melt inlets are formed in the bottom surface of the tundish to inject the melt into the mold. The melt inlet is provided with a nozzle, the melt is injected into the mold through the nozzle, and the nozzle is fixed by the refractory block.

In addition, a stopper for opening and closing the melt inlet is provided on the upper side of the nozzle of the tundish to control the supply amount of the melt. As a conventional stopper, as disclosed in Registration Utility Model No. 20-0184886, the inlet of the immersion nozzle mounted on the outlet of the tundish can be opened and closed in multiple stages by using a stopper rod repeating ascending and descending by the tumbler, To control the flow rate of the melt to be injected.

The stoppers of the tundish are generally made of refractory or metallic materials. However, since the stopper is directly exposed to the ultra-high temperature melt of about 1300 DEG C or more while repeating the operation of opening and closing the melt inlet, deformation, cracks and defects are frequently caused, and the operation is stopped to replace the stopper several times a day It is inevitable.

Regarding the above-mentioned problems, the registered utility model No. 20-0396541 discloses a refractory nozzle stopper having a heat block, so that a schematic configuration thereof will be described.

In order to selectively supply the molten material supplied to the tundish from the ladle of the steelmaking plant to the mold, the tip of the tundish is inserted through the operating hole of the tundish cover to be opened or closed by a separate operating rod In constructing the refractory nozzle stopper to operate in a downward direction, the operation hole of the tundish lid is provided with a heat block, and the refractory nozzle stopper is inserted into the through hole of the heat block, and is operated to move up and down.

Registration Utility Model No. 20-0184886 Registration Utility Model No. 20-0396541 Patent No. 10-0263367 Patent No. 10-0605698

A refractory nozzle stopper having the above-described conventional heat trap has a configuration in which a heat trap is provided at the upper end of the refractory nozzle stopper.

Therefore, although the heat generated from the melt in the tundish prevents direct heat from being applied to the connecting portion between the stopper and the working rod and the working rod, the stopper itself is still exposed to the melt.

As a result, in the conventional technique, deformations, cracks, and defects caused by direct contact with the melt frequently occur as in the conventional stoppers, so that it is still difficult to overcome the problem of having to be replaced several times during operation.

The problem of frequent replacement of the conventional tundish stopper is not only deteriorated in work efficiency due to stoppage of operation but also occurs when the stopper replacement time is delayed and the melted material leaks to the outside and the equipment is damaged, Since there is a risk of accidents, serious complaints are raised in the industry and urgent improvement is required.

Accordingly, the present invention has been made to solve the above-mentioned problems,

And is lifted up and down by a cylinder 160 coupled to the rear end of the tundish 200 and is provided on the upper side of the coaxial line with the melt inlet 210 formed on the bottom surface of the tundish 200, A stopper body 110 for opening / closing the stopper body 110;

A water supply passage 120 formed in a tubular shape having both ends open to be spaced apart from each other at a deep portion of the stopper body 110 and having a water supply port 121 formed at a rear end thereof to introduce cooling water;

A drainage passage 130 provided in a space separated from the inner diameter portion of the stopper body 110 by the water supply passage 120 and formed with a drainage hole 131 at a rear end thereof to discharge cooling water;

A heat insulating sheet 140 attached to an outer circumferential surface of the stopper body 110 to block heat transfer between the inside and the outside of the stopper body 110;

A hollow 151 having a predetermined depth corresponding to the outer diameter of the stopper body 110 is formed to be coupled with the stopper body 110 and a conical shape corresponding to the inclined surface of the nozzle 220 provided at the melt inlet 210 And a refractory cap 150 having an opening / closing part 152 of the refractory cap 150.

Further, the refractory cap 150 is prepared by kneading a monolithic refractory in the form of particles or powder, molding and drying to retain a certain strength;

A plurality of anchors 153 are fixed at predetermined intervals in the contact portion between the stopper body 110 inserted into the hollow 151 of the refractory cap 150 to firmly attach the refractory cap 150 to the stopper body 110 It is possible to effectively cool the stopper 100 and extend the service life thereof.

The present invention prolongs the service life of the stopper for controlling the supply amount of the melt by opening and closing the melt inlet of the tundish so that the service life of the stopper can be maintained for about one week or more, There is an advantage.

Accordingly, it is possible to improve productivity and safety by eliminating the problem of frequent stopping of the stopper in order to replace the stopper, thereby improving efficiency of the melt transfer operation, and ultimately, uniformity of quality can be achieved through continuation of the operation .

1 is a perspective view of an embodiment of a water-cooled stopper for a tundish of the present invention.
2 is a cross-sectional view of an embodiment of a water-cooling stopper for a tundish of the present invention.
3 is a schematic illustration of a use state of an embodiment of a water-cooled stopper for a tundish of the present invention.

Hereinafter, the structure and operation of the water-cooled stopper for tundish according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of an embodiment of a water-cooling stopper for a tundish according to the present invention, and Fig. 3 is a cross-sectional view of a water-cooled stopper for a tundish according to an embodiment of the present invention As well as a schematic usage state example according to FIG.

The water-cooled stopper 100 for a tundish to which the technique of the present invention is applied is characterized in that a stopper, which is provided to control the flow rate in the process of supplying the molten material transferred from the ladle 300 in the continuous casting facility to the mold, Cooling stopper 100 having a self-cooling structure so as to eliminate various problems such as frequent replacement due to exposure.

1 and 2, the water-cooled stopper 100 for a tundish according to the present invention includes a stopper body 110 for opening and closing a melt inlet 210, A heat insulating sheet 140 adhered to the outer circumferential surface of the stopper body 110 and a refractory cap 150 coupled to a front end of the stopper body 110. [

The stopper body 110 is formed in a vertical tube shape having a closed end and is provided on a coaxial line with the melt inlet 210 formed on the bottom surface of the tundish 200 and is connected to the rear end by a cylinder 160 So that the melt inlet 210 is opened and closed.

The cylinder 160 may be a conventional pneumatic or hydraulic reciprocating means and may be coupled with a flange (not shown) provided at the rear end of the stopper body 110 to raise and lower the stopper body 110.

The water supply passage 120 is formed in a tubular shape having both ends opened and spaced apart from each other at a deep portion of the stopper body 110, and a water supply port 121 is formed at a rear end thereof to introduce cooling water.

The drainage passage 130 is provided in a space separated from the inner diameter portion of the stopper body 110 and the water supply passage 120. A drainage hole 131 is formed at the rear end to discharge the cooling water.

The cooling water flowing into the water supply passage 120 formed at the deep portion of the stopper body 110 through the water supply port 121 passes through the stopper body 110 through the discharge passage formed along the inner peripheral surface of the stopper body 110 The cooling water is discharged to the outlet so that the cooling water can be circulated.

Since the rear end of the stopper body 110 is provided outside the tundish 200, the cylinder 160, the water inlet 121, and the water outlet 131 are also provided outside the tundish 200, And to form a coupling relationship with the means and the water supply / draining means.

The heat insulating sheet 140 is attached to the outer circumferential surface of the stopper body 110 to block heat transfer between the inside and the outside of the stopper body 110.

That is, when the stopper body 110 is supercooled by the cooling water, melts may adhere to the outer circumferential surface of the stopper body 110 due to a sudden temperature difference, resulting in a phenomenon of solidification and growth in an irregular shape. Therefore, by adhering the heat insulating sheet 140, a sudden temperature difference is reduced on the inner and outer surfaces of the stopper body 110 to form a film having a relatively uniform thickness even if the melt is adhered to the outer circumferential surface of the refractory cap 150 The stopper body 110 may be configured to have a function of protecting the metal stopper body 110 rather than the melt adhered thereto.

The refractory cap 150 is connected to the stopper body 110 by forming a hollow 151 having a predetermined depth corresponding to the outer diameter of the stopper body 110 and has a nozzle 220 And a conical opening / closing part 152 corresponding to the inclined surface.

The refractory cap 150 is provided to correspond to the depth of the melted material accommodated in the tundish 200 and is coupled to the outer side of the heat insulating sheet 140 at the front end of the stopper body 110.

The refractory cap 150 is preferably formed by kneading a monolithic refractory in the form of particles or powders and molding and drying the same so that the refractory cap 150 has durability even under repetitive operation within a melt having a constant strength, will be.

A plurality of anchors 153 are fixed at predetermined intervals in the contact portion between the stopper bodies 110 inserted into the hollow 151 of the refractory cap 150 so that the refractory cap 150 is attached to the stopper body 110 Tightly coupled.

The anchor 153 is welded to the stopper body 110 by welding a lower end of a support member (not shown) supported in the refractory cap 150, such as a U or V shape, By interlocking the stopper body 110, the refractory cap 150 is prevented from falling off even during repeated elevation operations in the melt.

An operation state of the water-cooled stopper 100 for tundish to which the technique of the present invention having the above-described structure is applied will be described below.

3, the continuous casting facility includes a ladle 300, which is a container for transferring molten melt in the melting furnace, and a tundish 200 for transferring the melt from the ladle 300 to the mold, .

The stopper 100 of the present invention has the stopper body 110 at the tip end inside the tundish 200 to open and close the melt inlet 210 provided at the bottom of the tundish 200, As shown in FIG.

In particular, the water-cooled stopper 100 of the present invention supplies cooling water through a water supply port 121 provided at a rear end of the stopper body 110 and supplies the cooling water to the water supply path 120 along the direction indicated by an arrow in FIG. 2 or 3, The cooling water circulating process for cooling the temperature of the stopper body 110 and discharging the cooling water through the drain port 131 is repeated.

The stopper body 110 is moved upward and downward by the lifting operation of the cylinder 160 coupled to the rear end of the stopper body 110 to control the flow rate and the flow rate of the melt supplied to the mold from the tundish 200, The tip of the stopper body 110 having the heat insulating sheet 140 and the refractory cap 150 is lifted and lowered inside the melted material accommodated in the tundish 200, Respectively.

Since the nozzle 220 for forming the inclined surface is provided in the melt inlet 210, the conical opening / closing part 152 provided at the tip of the refractory cap 150 is formed to correspond to the inclined surface of the nozzle 220, The flow rate and the flow rate of the molten material supplied to the mold through the melt inlet 210 can be controlled by adjusting the height of the stopper 100 or the elevation speed of the stopper 100 as needed.

Therefore, the water-cooled stopper 100 for a tundish according to the present invention can prevent the stopper body 110 from being directly exposed to the ultra-high temperature melt by using the heat insulating sheet 140 and the refractory cap 150 A water supply passage 120, a drainage passage 130, and a drainage hole 131 so that the cooling water can be circulated inside the stopper body 110 in order to effectively cool the stopper body 110 itself. The stopper 100 can be effectively cooled and the service life can be prolonged.

Accordingly, the water-cooled stopper 100 for a tundish according to the present invention can maintain its service life for about a week or more as compared with an average of three to four replacements per day in the past. Thus, There is an advantage that various effects such as securing can be derived.

100: Stopper
110: Stopper body
120: Water supply
121: Water supply
130: drainage
131: Drain
140: Heat-insulating sheet
150: Fireproof cap
151: hollow
152:
153: Anchor
160: Cylinder
200: Tundish
210: melt inlet
220: Nozzle
300:

Claims (2)

And is lifted up and down by a cylinder 160 coupled to the rear end of the tundish 200 and is provided on the upper side of the coaxial line with the melt inlet 210 formed on the bottom surface of the tundish 200, A stopper body 110 for opening / closing the stopper body 110;
A water supply passage 120 formed in a tubular shape having both ends open to be spaced apart from each other at a deep portion of the stopper body 110 and having a water supply port 121 formed at a rear end thereof to introduce cooling water;
A drainage passage 130 provided in a space separated from the inner diameter portion of the stopper body 110 by the water supply passage 120 and formed with a drainage hole 131 at a rear end thereof to discharge cooling water;
A heat insulating sheet 140 attached to an outer circumferential surface of the stopper body 110 to block heat transfer between the inside and the outside of the stopper body 110;
A hollow 151 having a predetermined depth corresponding to the outer diameter of the stopper body 110 is formed to be coupled with the stopper body 110 and a conical shape corresponding to the inclined surface of the nozzle 220 provided at the melt inlet 210 And a refractory cap (150) having an opening / closing part (152) of the waterproof cap (150). The method according to claim 1,
The refractory cap 150 may be formed by kneading a monolithic refractory in the form of particles or powder and molding and drying the same to provide a certain strength. Wherein a plurality of anchors (153) are fixed at regular intervals to the stopper body (110) so that the refractory cap (150) is firmly coupled to the stopper body (110).

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