JP2007275914A - Plasma heating apparatus of tundish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma heating apparatus which allows a tundish to be moved without causing a plasma torch and a torch support apparatus to perform ascending movement in advance by suspending a junction of the plasma torch and the torch support in a rockable manner when the tundish is moved by the occurrence of the moving motion of the tundish in such a state that the plasma torch is inserted into the tundish. <P>SOLUTION: The plasma heating apparatus heats the molten steel in the tundish with the plasma by inserting the plasma torch of the plasma heating apparatus from a torch insertion port 10 formed in a cover 4 covering the upper part of the tundish 1 placed on a travelable tundish car, wherein the plasma torch 9 is suspended in a freely rockable manner in the moving direction of the tundish 2 in the freely elevatable torch support apparatus 11 supporting the plasma torch 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, when a plasma torch for plasma heating of molten steel in a tundish is inserted in a continuous casting facility, when the tundish is moved and the tundish is moved, the plasma torch is raised in advance. A plasma heating apparatus that does not need to be provided is provided.

  In a continuous casting facility, molten steel in a tundish is continuously supplied to a mold from a casting nozzle provided at the bottom of the tundish. A plasma heating apparatus is used for heating the molten steel in the tundish (see Patent Documents 1 and 2).

  In the tundish plasma molten steel heating device of Patent Document 1, the upper part of the tundish that can be moved by a tundish car is closed by a cover, and in this cover, a nozzle insertion hole for inserting a ladle nozzle into the tundish, A torch insertion port for inserting a plasma torch into a heating chamber formed under the cover is provided. A plasma torch support device that heats the molten steel is mounted above the tundish. The plasma torch support device supports a plasma torch that generates a plasma arc between the molten steel in the tundish and the plasma torch in the vertical direction. A torch insertion device, a lifting device that moves the plasma torch and the torch insertion device together, and a centering device that moves the plasma torch back and forth.

  In the heating of the molten steel, the plasma torch is lowered into the tundish, and a plasma arc is generated between the plasma torch and the molten steel to heat the plasma.

  If emergency evacuation is necessary in the event of an abnormality such as a coolant leak circulating inside the plasma torch, move the elevating device and torch insertion device to remove the plasma torch from the torch insertion port, and then remove the tundish car. Move.

In Patent Document 2, in the plasma heating apparatus for molten steel in tundish, a torch lifting / lowering driving force portion is provided at the lower part of a torch lifting / lowering apparatus constituted by a plasma torch and a torch support arm, The ascending limit of the plasma torch is retracted by the rotational force of the ascending / descending driving force, but in the event of a power failure, the ascending / descending driving force is separated by a clutch and the ascending limit is retracted by a counterweight connected to the torch support arm via a wire. It is possible.
JP-A-6-198401 JP-A-9-122849

  Because the torch in the conventional plasma heating device was rigidly joined to the torch support device, the tundish was evacuated with a tundish car due to a breakout or abnormal slide nozzle when the torch was inserted into the heating chamber through the cover. When the need arises, since the torch is rigidly joined to the torch support device, it is necessary to pull up the plasma torch in advance, and it takes time to raise the plasma torch. Further, the movement of the tundish car may cause the plasma torch and the torch support device to be pulled by the tundish cover and be damaged.

  Therefore, the present invention makes it possible to swing the joint between the plasma torch and the torch support device when the tundish is moved by the occurrence of the tundish moving operation in a state where the plasma torch is inserted in the tundish. The tundish can be moved without hanging down and moving the plasma torch and the torch support device in advance, and there is no risk of destroying the plasma torch or the torch support device even if the tundish is moved by mistake. A plasma heating apparatus is provided.

  The present invention is a plasma that plasma-heats molten steel in a tundish by inserting a plasma torch of a plasma heating device from a torch insertion port formed in a cover that covers an upper part of the tundish mounted on a tundish car capable of traveling The heating device is characterized in that the plasma torch is suspended so as to be swingable in the moving direction of the tundish on a liftable torch support device that supports the plasma torch.

  In the above configuration, the torch support device can be supported by an arm that moves up and down and turns or moves forward and backward.

  In the present invention, when the tundish is moved due to the movement of the tundish in a state where the plasma torch is inserted in the tundish, the plasma torch is suspended so as to swing at the joint portion of the torch support device. Therefore, the tundish can be moved immediately without causing the plasma torch and the torch support device to move up in advance.

  Further, it is possible to avoid a situation where the plasma torch and the torch support device are destroyed when the tundish is accidentally evacuated.

  FIG. 1A is a plan view around a tundish where a plasma heating apparatus of the present invention is arranged, FIG. 1B is a schematic longitudinal sectional view thereof, and FIGS. 1A and 1B are provided with two plasma torches. Although it is an apparatus, the configuration is the same in the case of one plasma torch.

  The tundish 1 is placed on the tundish car 2 and moves on the rail 3 in the direction of the arrow shown in FIG. The upper part of the tundish 1 is covered with a cover 4. The cover 4 has a nozzle insertion hole 6 for inserting a ladle nozzle (not shown) of the ladle 5 conveyed above the tundish 1 into the tundish, and a heating chamber formed under the cover 4. 7 is provided with a torch insertion port 10 into which the plasma torch 9 of the plasma heating device 8 is inserted. The torch insertion opening 10 is sized such that the plasma torch 9 is inclined by the movement of the tundish 1 and the tip of the torch is positioned above the torch insertion opening 10.

  In FIG. 1, a plasma heating device 8 hangs a plasma torch 9 swingably in the moving direction of a tundish car 2 on which a tundish 1 is placed on a torch support device 11. The torch support device 11 is supported by an arm 12 that moves up and down. As the arm 12 moves up and down, the torch support device 11 and the plasma torch 9 supported by the torch support device 11 also move up and down. Further, the arm 12 may be further turned or moved forward and backward in relation to the work space.

  FIG. 2A is a front view showing a joining portion between a plasma torch and a torch support device, and FIG. 2B is a side view thereof.

  To the arm fixing member 13 that fixes the torch support device 11 to the arm 12, a torch mounting member 14 for mounting the plasma torch 9 is suspended by a pin 15 so as to be swingable in the moving direction of the tundish 1. The torch mounting member 14 swings to a state indicated by a one-dot chain line in FIG.

  FIG. 3 is an explanatory view of the operation of the tundish and the plasma torch in the present invention.

  As shown in FIG. 3A, in a steady state, a plasma torch 9 is inserted from the torch insertion port 10 of the cover 4 of the tundish 1, and a plasma arc is generated between the plasma torch 9 and the molten steel to cause plasma heating. Then, the temperature is kept, and is continuously supplied from the casting nozzle at the bottom of the tundish 1 to the mold.

  In the state in which the plasma torch is inserted in the tundish, when emergency evacuation of the tundish becomes necessary due to a breakout or an abnormality in the dandish slide nozzle, the operation of the plasma torch 9 is stopped, and then FIG. As shown in (b), when the tundish 1 is moved by the tundish car, the plasma torch 9 is relatively moved in the moving direction of the tundish 1 and comes into contact with the torch insertion port 10.

  Further, when the tundish 1 is moved, as shown in FIG. 3C, the plasma torch 9 is rotated and inclined by the edge of the torch insertion port 10, and the tip of the plasma torch 9 is raised.

  Further, when the tundish 1 is moved, the tip of the plasma torch 9 is placed on the cover 4 and pulled out from the torch insertion port 10 as shown in FIG. In this state, the tundish 1 is moved to a predetermined position as it is, and the plasma torch 9 is moved up to the predetermined position by the arm 12 or further turned or moved forward and backward.

  The tip of the torch is slightly dragged on the cover 4 by the movement of the tundish 1, but even if it is damaged, it is manufactured so that it can be easily replaced as a consumable, so that it can be easily replaced.

  When returning to the steady operation, the tundish 1 is returned to the operating position by the tundish car 2, and the plasma torch 9 is inserted into the torch insertion port 10 of the cover 4 by the lowering operation of the arm.

(A) is a plan view around the tundish in which the plasma heating apparatus of the present invention is arranged, and (b) is a schematic longitudinal sectional view thereof. (A) is a front view which shows the junction part of a plasma torch and a torch support apparatus, (b) is the same side view. It is explanatory drawing of operation | movement of the tundish and plasma torch in this invention.

Explanation of symbols

1: Tundish 2: Tundish car 3: Rail 4: Cover 5: Ladle 6: Nozzle insertion hole 7: Heating chamber 8: Plasma heating device 9: Plasma torch 10: Torch insertion port 11: Torch support device 12: Arm 13 : Arm fixing member 14: Torch mounting member 15: Pin

Claims (3)

In the plasma heating device for plasma heating the molten steel in the tundish by inserting the plasma torch of the plasma heating device from the torch insertion port formed in the cover that covers the upper part of the tundish mounted on the tundish car that can travel,
A tundish plasma heating apparatus, characterized in that a plasma torch is suspended from a liftable torch support device supporting a plasma torch so as to be swingable in a tundish movement direction.   2. The tundish plasma heating apparatus according to claim 1, wherein the torch support device is supported by an arm that moves up and down.   3. The tundish plasma heating apparatus according to claim 2, wherein the arm can move forward and backward or turn freely.

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