KR20030001662A - The gate tube changer of tundish - Google Patents

Abstract

PURPOSE: A nozzle exchange apparatus is provided which exchanges a nozzle promptly and accurately to prevent clogging of the nozzle of a tundish in casting process and which is automated to simply perform nozzle exchange operation at the optimum position considering working conditions of the tundish in operating the apparatus. CONSTITUTION: In an apparatus for exchanging a submerged nozzle in which a nozzle cassette for exchanging the nozzle(50) is mounted on a certain position of a tundish to remove a waste nozzle and mount a new nozzle around the nozzle cassette, the apparatus comprises a travelling cart(60) which is independently traveled along the circumference of the tundish around the nozzle cassette with an operator got into the travelling cart; a drive base(64) comprising a swing block(63) which is mounted on the travelling cart so that one end of the drive link(61) is rotationally mounted on the swing block by a hinge(62) to control a transport direction of the nozzle(50), and which rotationally drives the drive link around the hinge; a drive link(61) which is mounted on the drive base(64) by a hinge so that the drive link is rotated around an arbitrary rotation radius by a driving part of the swing block; and a submerged nozzle moving part(67) comprising a moving rod(66) which rotationally fixes one end of the drive link through a fixed block(65), to which the fixed block is fixed so that the moving rod is interlockingly operated along the rotation radius of the drive link by means of the fixed block, and to the front end of which the submerged nozzle is fixed so that the submerged nozzle is moved in a straight line, wherein the travelling cart(60) comprises a control board consisting of a control panel(68) and a drive/steering controller(69), and a sensor(70) for measuring and controlling displacement is mounted on the submerged nozzle moving part(67).

Description

Immersion nozzle changer {The gate tube changer of tundish}

The present invention relates to an immersion nozzle exchange apparatus for tundish or ladle used for melting and casting metals, and more particularly, to quickly and easily exchange immersion nozzles. In addition, by replacing the immersion nozzle replacement equipment in the tundish structure to improve the exchange workability and stability, to maintain the overall continuity of the casting process.

A tundish or ladle is a metal container mainly used for melting and casting operations for melting and casting metals. In particular, tundish is lined with refractory materials whose inner walls are heat resistant. The nozzle is attached as a hot water outlet.

1 is a schematic view of a vertical continuous casting machine for explaining a vertical continuous casting method in dissolving and casting a metal, in which a molten metal 10 is heated from a furnace to a ladle 1 provided with an auxiliary heating device and lined with refractory materials. Is moved to a tundish 30 which may have several outlets. Then, it flows into the water-cooled mold 2, and heat is quickly transmitted and discharged, and a drawing pull roll 4 and a bending roll 5 for plastic deformation are provided.

In the continuous casting process, the solidified molten metal 10 is injected into a precisely assembled vibrating water-cooled mold. The casting shape is determined according to the shape of the mold. The end of the solidified metal is grasped and pulled out of the mold and cut through the guide roll to a constant length until the final product is obtained.

The tundish 30 used in the casting process is designed with a nozzle 50 so that the inner wall is lined with refractory to withstand the high temperature of the molten metal and the molten metal can be smoothly sent to the destination. Since it is in contact with the (10), the characteristics of the semi-permanent consumables do not deviate, and thus the maintenance of the refractory or the replacement of the immersion nozzle 50 is a situation that is made regularly and irregularly whenever necessary. In particular, the replacement of the immersion nozzle 50 requires replacement when the nozzle is clogged or damaged by a scheduled plan during casting or by refractory during casting, and a sudden immersion nozzle replacement may be required during casting.

Replacing or repairing the immersion nozzle 50 in a normal manner is subject to many limitations in reality. The immersion nozzle 50 checks before casting to correct clogging or damage in advance to dissolve or tap the molten metal, but the blockage of the nozzle 50 is mainly generated in the state of containing the molten metal. The cause is mainly caused in casting operations, such as lining material falling by molten metal to block the hole of the nozzle. If the nozzle is to be replaced in the casting operation, the molten metal may be removed and the temperature in the container may be reduced to room temperature for a long time, and the nozzle may be replaced or the hole blockage may be repaired. This is a long way from productivity and economics because it requires a long time.

In the casting process of metal, such nozzle exchange occurs frequently, and GTC (Gate Tube Changer) work for nozzle replacement is common and a replacement device is proposed accordingly.

The submerged nozzle exchange apparatus of Korean Patent Registration No.0207852 has been described in detail with respect to the submerged nozzle. This technique is proposed in consideration of the importance of the shortening of the casting process according to the immersion nozzle, the rapid accuracy of the nozzle change, and the direction selectivity of the nozzle.

The main part is an immersion nozzle cylinder 22 fixedly provided under the sliding valve device 21 provided for controlling the discharge of molten metal at the bottom of the molten metal container 10 as shown in FIG. An immersion nozzle holding cylinder 22 having a piston rod 23 movable vertically with respect to the piston rod, and fixedly mounted to the piston rod for vertical movement with the piston rod, and having a horizontal guide groove formed on an opposite inner surface thereof. A guide arm unit (24) having a pair of horizontal guide rails having open opposite ends, each of the guide rails (25) having guide grooves fitted on tops of the immersion nozzles on opposite inner surfaces of each guide rail (25); A guide having a length suitable for slidingly receiving the fitting provided on the case and for holding three or more of the nozzle cases. Immersion nozzle replacement for moving the immersion nozzle 27 with the arm unit 26 and the fitting portion fitted into the guide groove to the nozzle mounting position just below the molten metal outlet of the sliding valve device along the guide groove 26. As the cylinder 28, it is provided with the press member 29 which can move horizontally in and out of the guide arm unit, and the immersion nozzle cylinder 22 moves a piston rod and a guide rail upwards, and a immersion nozzle is a nozzle mounting position. , The upper end of the immersion nozzle is pressed against the bottom of the sliding valve device, the pressing member is operated to move the immersion nozzle, and then the piston rod and the guide arm unit are moved downwardly away from the nozzle mounting position. It is a structure including an immersion nozzle replacement cylinder. Reference numeral 30 in FIG. 2 is a hydraulic cylinder, 31 is an insertion nozzle, 33 is a bottom plate, 34 is a sliding plate, and 35 is a nozzle case.

This technique includes a sliding valve device for controlling the flow rate of molten metal flowing out of the molten metal container 10 such as a tundish, a holding cylinder supported vertically under the sliding valve device, and a piston rod of the cylinder. It has a guide arm supported in a horizontal state, the guide arm has a pair of guide rails parallel to each other, the nozzle case at the top three or more submerged nozzles extending in the horizontal direction on the surface facing each other the guide rail portion The replacement cylinder for pumping the new submerged nozzle retained by fitting to the nozzle mounting position is provided.

However, this technology is equipped with a sliding valve device, a guide arm, a guide rail, a nozzle case, and a replacement cylinder to control the flow rate of molten metal around the nozzle to replace the nozzle. It does not include surrounding conditions related to nozzle replacement and transportation, nozzle positioning, and post nozzle replacement treatment, which are simply related to nozzle replacement.

As another technique related to nozzle clogging, a technique for preventing nozzle clogging is known as Korean Utility Model Publication No. 1999-0018028, 'Tundish Nozzle Clogging Structure.'

However, this technique is intended to improve the problem of clogging nozzles with non-metallic inclusions on the inner surface of tundish nozzles intended to supply molten steel from the tundish to the mold. It is a technique for preventing the problems caused by clogging of nozzles.

It is therefore an object of the present invention to provide a nozzle changer for changing nozzles quickly and accurately in preparation for nozzle clogging of tundish in the casting process.

Another object of the present invention is to provide an automated nozzle changer that can simplify the nozzle change operation at an optimum position in consideration of the working atmosphere of the tundish in operating the nozzle changer.

Immersion nozzle exchange apparatus of the present invention for achieving this object,

A nozzle cassette for nozzle replacement at a predetermined position of a tundish is mounted, and a nozzle exchanger for removing a waste nozzle centering on the nozzle cassette and mounting a new nozzle,

A traveling cart that can frequently run along the periphery of the tundish with the operator on the nozzle cassette;

A drive base having a swing block mounted at the driving cart and rotatably mounted at one end of the drive link to control a conveying direction of the nozzle and driving the drive link around the hinge;

A drive link mounted to the drive base and hinged to rotate at a predetermined radius of rotation by a drive unit of a swing block,

Immersion nozzle including one end of the drive link is rotatably fixed through a fixed block and the fixed block is fixed by interlocking with the rotation radius of the drive link and the moving rod for fixing the immersion nozzle in a linear manner. It is characterized by consisting of a moving part.

Another aspect of the invention, the step of loading and clamping the immersion nozzle to be replaced by the operator riding the cart to the moving rod of the immersion nozzle moving portion;

When the immersion nozzle is mounted on the moving rod is completed by moving the traveling cart to the replacement position to drive to the working position,

After moving to the exchange position to align the working position,

Replacing the immersion nozzle by releasing the clamping by seating the nozzle by the immersion nozzle moving unit after the position alignment step;

Reloading the waste immersion nozzle exchanged in the above step into the moving rod of the immersion nozzle moving unit and taking out the immersion nozzle retrieving unit to return the moving rod and the immersion nozzle moving unit horizontally after clamping;

It characterized in that the immersion nozzle replacement method comprising the step of driving the running cart in order to discard the waste immersion nozzle, dropping the waste immersion nozzle to a designated place and moving back to the standby position.

In this way, when the exchange device for immersion nozzle replacement and configuration is operated around the tundish, the immersion nozzle can be exchanged quickly and accurately, and the immersion nozzle can be safely managed in the transportation and disposal of the immersion nozzle. You can also secure.

1 is an explanatory view of a vertical continuous casting machine and a continuous casting method for explaining the vertical continuous casting method in the melting and casting of metal

Figure 2 is a sectional view of the main part of the conventional immersion nozzle changer

3 is a configuration example of a nozzle exchange cassette of a tundish

4 is a sequence diagram of an immersion nozzle exchange.

5 is a schematic view of a tundish immersion nozzle exchange apparatus according to the present invention, (a) is a plan view (b) is a front view

6 is a view showing an example of a bidirectional exchange operation for explaining an example of the replacement operation of the tundish immersion nozzle according to the present invention;

7 is a view showing the detailed replacement process of the tundish immersion nozzle replacement operation according to the present invention in the order (a) ~ (i), respectively;

* Description of the symbols for the main parts of the drawings *

10: molten metal 40: exchange cassette

50,50a: Nozzle 60: Riding Cart

61: drive link 62: hinge

63: swing block 64: drive base

65: fixed block 66: moving rod

67: immersion nozzle moving part 68: control panel

69: drive / steering controller 70: sensor

71: pin 72: nozzle clamp

73: frame

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

3 is a structural example of a nozzle exchange cassette of a tundish. 4 shows a sequince diagram of immersion nozzle exchange.

Figure 5 is a schematic diagram of a tundish immersion nozzle exchange apparatus carried by the operator according to the present invention, (a) is a plan view (b) is a front view. 6 shows an example of a bidirectional exchange operation for explaining an example of the replacement operation of the tundish immersion nozzle according to the present invention. Figure 7 shows the detailed replacement process of the tundish immersion nozzle replacement operation according to the present invention in the order (a) ~ (i), respectively.

3 is a tundish immersion nozzle replacement cassette 40. This exchange cassette 40 is known. The main parts are a safety blank 41, a tong 42 mounted to one end of the safety plate 41, an immersion nozzle replacement cylinder 43 mounted to one end of the replacement cassette 40, and a safety pin 44. And the hydraulic cylinder 45.

4 is a sequence of an exchange process of the immersion nozzle obtained according to FIG. The new nozzle 50 is seated in the 'A' direction, the new nozzle 50 is mounted on the nozzle insert 51, and the replaced waste nozzle 50a is removed in the 'B' direction. Exchange and removal of the immersion nozzle 50, 50a as shown in Figure 4 is known.

In the present invention, in replacing the immersion nozzles around the nozzle exchange cassette 40 as shown in FIG. 4, the nozzle 50 is transported and mounted to the nozzle cassette 40 and turned until the discarded immersion nozzle 50a is discarded. As a device for transporting the nozzles 50 and 50a around the dish, the main part is equipped with a nozzle cassette 40 for nozzle replacement at a predetermined position of a tundish (molten metal container), as shown in FIG. In the nozzle changer which removes the waste immersion nozzle 50a around the nozzle cassette 40 and mounts the new nozzle 50, the operator frequently rides around the nozzle cassette 40 along the periphery of the tundish. A traveling cart (60) capable of traveling and one end of the drive link 61 are rotatably mounted to the travel cart 60 to control the conveying direction of the nozzle 50 by a hinge 62. The drive link 61 is driven around the hinge 62. A drive base (64) having a swing block (63), a drive link (61) mounted to the drive base (64) and a hinge (62) and rotating with an arbitrary rotation radius by the swing block (63), One end of the drive link 61 is rotatably fixed through the fixing block 65, and the fixing block 65 is fixed so that the drive link 61 is interlocked according to the rotation radius of the drive link 61 and the nozzle 50 is straight. It consists of an immersion nozzle moving portion 67 including a moving rod 66 to secure the movement to the tip.

The traveling cart 60 may have a control panel, which may include a control panel 68 and a drive / steering controller 69. In addition, the immersion nozzle moving unit 67 may be equipped with a sensor 70 for measuring and controlling the movement amount. The nozzle 50 is fixed to the pin 71 so as to be rotatable at the distal end of the movable rod 66 and to be mounted and detached.

The drive / steering controller 69 is a moving device control unit including a steering wheel for driving and steering a driving wheel for driving the traveling cart 60.

The drive base 64 is a device for operating the swing table driving swing block 63 and the drive link 61 lever for fixing the immersion nozzle moving unit 67 as the driving unit of the swing block 63.

The immersion nozzle moving unit 67 is a device that is fixed to the drive base 64 by the drive link 61 and clamps the nozzle 50 to flexibly operate the front and rear rotation and nozzle rotation. 72), an arm, a frame 73, a hinge bracket type fixed block 65, a sensor 70, and the like.

Figure 6 schematically shows the operating situation of the nozzle changer of the present invention centering on the tundish 10, it is possible to simultaneously replace the nozzles on both sides.

In the nozzle replacement method according to the present invention, the operator loads and clamps the nozzle 50 to be replaced by riding in the traveling cart 60 to the moving rod 66 of the immersion nozzle moving unit 67, and the nozzle 50 is When the mounting rod is completed, the moving cart 60 is moved to the replacement position driving to the work position, the moving position is moved to the exchange position, the movement position is aligned after the movement, and the immersion nozzle moving part after the position alignment step. The nozzle 50 is seated by the 67 to release the clamping to replace the nozzle 50a, and the replaced waste nozzle 50a is reloaded into the moving rod 66 of the immersion nozzle moving part 67 and clamped. After discharging the waste immersion nozzle 50a for returning the moving rod 66 and the immersion nozzle moving part horizontally, the traveling cart 60 is reversed to dispose of the immersion nozzle. Drop 50a) and move it back to stand-by position The process proceeds to the steps of group.

More specifically, it can be seen through the exchange process of FIG. (a) and (b) are the loading and clamping of the nozzle and the initial rotation of the drive link 61. (c) is a state in which the nozzle 50 is brought close to the replacement site by rotating the brave link 61. (d) is a state where the new nozzle 50 is aligned with the waste nozzle (50a) in position, and (e) replaces the new nozzle (50) with the waste nozzle (50a) in place of the waste nozzle (50a) It is a waiting step for mounting the new nozzle 50 and discharging the waste nozzle 50a through the moving rod instead.

(f) is an initial stage in which the waste nozzle is inclined at an angle to take out the waste nozzle 50a, and (g) is the waste nozzle 50a rotated in a substantially horizontal state to a position parallel to the moving rod 66. An intermediate step (h) is a state in which the entire immersion nozzle moving unit 67 is picked up by rotating the drive link 61 to lift the waste nozzle 50a. (i) is a standby state for further rotating the drive link 61 to completely drop the waste nozzle 50a from the tundish 10, which is similar to step (a) which is a working standby state. As described above, the submerged nozzle exchanged in the steps (a) to (i) does not require a direct operator to hold the nozzle 50 and clamp it to the tundish 10. It can be taken out and discarded through the eastern part 67, and thus the work stability is high, and the nozzle can be exchanged by using the equipment, so that the replacement work can be performed quickly and accurately, and the work error and error are small.

Thus, in the present invention, in order to replace the tundish immersion nozzle, by using a traveling cart for clamping and replacing the nozzle around the tundish and the apparatus provided in the traveling cart, the nozzle can be exchanged for speed and accuracy of nozzle replacement. It is possible to significantly reduce the work waiting time in the casting process has the effect of maintaining the continuity of the process.

In addition, since the nozzle can be replaced while the operator controls the various devices in the traveling cart, the work stability is also improved, and the work completion is improved because it does not require high skill.

Claims (4)

In an immersion nozzle exchanger, a nozzle cassette for replacing a nozzle is mounted at a predetermined position of a tundish, and a waste nozzle is removed around the nozzle cassette and a new nozzle is mounted. A traveling cart that can frequently run along the periphery of the tundish with the operator on the nozzle cassette; A drive base having a swing block mounted on the driving cart and having one end of a drive link rotatably mounted to control the carrying direction of the nozzle, and rotatably driving the drive link about the hinge; A drive link mounted to the drive base and hinged to rotate at a predetermined radius of rotation by a drive unit of a swing block, One end of the drive link is rotatably fixed through the fixing block and the fixing block is fixed to the interlocking drive according to the rotation radius of the drive link through the media and the immersion nozzle including a moving rod for fixing to the front end to enable a linear movement Immersion nozzle exchange device, characterized in that consisting of the immersion nozzle moving. The method of claim 1, The traveling cart has a control panel, the control panel immersion nozzle exchange apparatus, characterized in that consisting of a control panel and a drive / steering controller. The method of claim 1, The immersion nozzle changer is equipped with a sensor for measuring and controlling the movement amount in the immersion nozzle moving unit. Loading and clamping an immersion nozzle to be replaced by a worker in a traveling cart on a moving rod of the immersion nozzle moving unit; When the immersion nozzle is mounted on the moving rod is completed by moving the traveling cart to the replacement position to drive to the working position, After moving to the exchange position to align the working position, Replacing the immersion nozzle by releasing the clamping by seating the nozzle by the immersion nozzle moving unit after the position alignment step; Reloading the waste immersion nozzle exchanged in the above step into the moving rod of the immersion nozzle moving unit and taking out the immersion nozzle retrieving unit to return the moving rod and the immersion nozzle moving unit horizontally after clamping; And immersing the driving cart in order to discard the immersion nozzle, and dropping the waste immersion nozzle in a designated place and moving back to the standby position.