JPH09122849A - Plasma heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently secure the working space around a tundish by arranging a torch fitting angle adjusting mechanism at the connection part of a torch supporting arm and a plasma torch and a torch inserting angle adjusting mechanism at the connection part of a torch elevating device and the turning base table of a torch turning device. SOLUTION: The supporting angle of the plasma torch 1 and the inserting the plasma torch 1 into the tundish 2 are made adjustable by providing the adjusting mechanism for fitting angle to the connection part 13 of the plasma torch 1 and the torch elevating device 5 and the connection part 14 of the torch elevating device 5 and the turning base table of the torch turning device 6. By this constitution, the latitude of the setting place of a plasma heating device is extended and the working space around the tundish 2 can sufficiently be secured. Further, in a driving system of the torch elevating device, the deformation of machining parts caused by radiation heat from the tundish 2 and the damage of an electric product can be protected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten steel in a tundish of a continuous casting facility composed of a torch lifting device for supporting and lifting a plasma torch, and a torch turning device for turning the plasma torch and the torch lifting device integrally. Of the plasma heating device.

[0002]

2. Description of the Related Art Conventionally, for heating molten steel in a tundish using a plasma torch, for example, Japanese Patent Publication No.
There are heating devices disclosed in Japanese Patent No. 183946 and Japanese Patent Laid-Open No. 6-198401.

The heating device disclosed in Japanese Patent Publication No. 62-183946 is composed of a support arm for supporting the plasma torch and a support for supporting the support arm. The support column is cantilevered on the support column so that a support arm installed on the work floor can move up and down and turn, and a plasma torch is suspended at the tip. Further, the plasma torch is moved forward and backward by expanding and contracting the support arm itself.

The heating device disclosed in Japanese Patent Laid-Open No. 6-198401 is composed of a torch insertion device for moving the plasma torch in the vertical direction and an elevating device for elevating the torch insertion device diagonally from the upper surface of the tundish to the torch retreat position. The constructed plasma torch support device is provided on the ladle carriage.

[0005]

SUMMARY OF THE INVENTION
It has the following problems. In the plasma heating apparatus according to Japanese Patent Publication No. 62-183946, (a) Since the column supporting the plasma torch is placed near the tundish, the work around the tundish is hindered. (B) Since the installation angle and insertion angle of the plasma torch are fixed, the installation location of the device is restricted.

In the plasma heating apparatus disclosed in Japanese Patent Laid-Open No. 6-198401, (a) the torch elevating and lowering drive system is located above the tundish, so that it is affected by heat, thermal deformation of mechanical parts, breakdown of electrical parts, etc. Easy to invite. (B) The equipment is large and installation places are limited. (C) The drive system of the torch insertion device and the drive system of the torch lifting device are far from the operating floor, and maintainability is poor.

The present invention provides a plasma heating apparatus which eliminates the above-mentioned conventional problems, and an emergency evacuation of the torch is ensured while sufficiently securing a working space around the tundish, which has many equipment constraints. It is equipped with certain functions.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a tundish for a continuous casting facility comprising a torch lifting device for supporting and lifting a plasma torch, and a torch turning device for turning the plasma torch and the torch lifting device integrally. In a plasma heating apparatus for in-molten steel, a connecting portion between the plasma torch and the torch lifting device and a coupling portion between the torch lifting device and the swivel base of the torch lifting device have a function of adjusting an attachment angle, The support angle and the insertion angle for inserting the plasma torch into the tundish can be adjusted. Further, a clutch is provided in the drive system of the torch lifting device, and a counterweight is connected so that the torch support arm can always be raised, thereby making it possible to withdraw the ascent at the time of a power failure, thereby solving the above problems. .

The plasma heating device of the present invention comprises a torch lifting device for supporting and lifting the plasma torch, and a torch turning device for turning the plasma torch and the torch lifting device integrally, and a connecting portion between the plasma torch and the torch lifting device. Also, by installing a function to adjust the mounting angle at the connection part of the torch lift device and the swivel base of the torch lift device, it was possible to adjust the support angle of the plasma torch and the insertion angle for inserting the plasma torch in the tundish. The flexibility of the place has expanded, and it has become possible to secure a sufficient working space around the tundish.

Further, in order to protect the tip of the plasma torch by pulling it up from the inside of the tundish at the time of power failure, a clutch is provided in the drive system of the torch lifting device, and a counterweight is connected so that the torch support arm can always be raised. This enabled the evacuation limit to be retracted during a power failure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a conceptual diagram of a plasma heating apparatus according to the present invention. FIG. 2 shows the support angle and insertion angle of the plasma torch.

FIG. 1 shows a molten steel in a tundish 2 of a continuous casting facility composed of a torch lifting device 5 for supporting and lifting the plasma torch 1 and a torch turning device 6 for turning the plasma torch 1 and the torch lifting device 5 integrally. In the plasma heating apparatus, the plasma torch 1, the connecting portion 13 of the torch support arm 4, and the connecting portion 14 of the torch elevating device 5 and the swivel base 17 of the torch swivel device 6 are provided with an angle adjusting function, so that plasma The support angle of the torch and the insertion angle for inserting the plasma torch into the tundish are adjustable, and this plasma heating device is provided on the working floor 7.

The torch lifting device 5 comprises a plasma torch 1 and a torch support arm 4, and the torch lifting device 5
Rotational force by the torch lifting drive force section 8 arranged at the lower part of the
The plasma torch 1 can be moved up and down via the torch support arm 4 connected to the traveling moving body 15. As a result, in the drive system of the torch lifting device 5, it is possible to prevent deformation of mechanical parts and breakdown of electrical parts due to radiant heat from the tundish 2.

In a normal emergency evacuation, the torch lift drive force unit 8 is used.
The plasma torch 1 is retracted to the upper limit by the rotational force of the torch lifter. However, in the event of a power failure, the clutch 9 provided in the drive system of the torch lifter 5 disengages the torch lift drive force unit 8 and the torch support arm 4 via the wire 11. The torch support arm 4 can be always lifted by the counterweight 12 connected as a unit, so that the ascending end of the torch support arm 4 can be withdrawn.

FIG. 2A shows the support angle θ of the plasma torch.
1 and FIG. 2 (b) show the insertion angle θ2 of the plasma torch. Connection part 1 between plasma torch 1 and torch lifting device 5
3, the torch elevating device 5 and the connecting portion 14 of the turning base of the torch turning device 6 can change the mounting angle.

As an example of the torch support angle adjusting mechanism, as shown in FIG. 3, the torch handling part 18 is rotatably fixed to the tip end part of the torch support arm 4 via the rotary shaft 16, and the torch handling part 18 is also provided. A screw 19 for fixing to the tip of the torch support arm 4 is provided. Further, a turnbuckle 20 that connects the torch handling unit 18 and the torch support arm 4 is provided. When adjusting the support angle θ 1, loosen the fixing screw 19 and then adjust the turnbuckle 20 to determine the torch support angle,
The torch handling unit 18 is again fixed to the torch support arm 4 by the fixing screw 19. As an example of the torch insertion angle adjusting mechanism, if the torch elevating device 5 and the swivel base of the torch swivel device 6 are connected to each other by a hydraulic cylinder, the torch elevating device 5 of the heavy torch elevating device 5 can be connected. The insertion angle θ 2 can be adjusted.

Thus, the support angle θ1 of the plasma torch is
Also, since the insertion angle θ2 for inserting the plasma torch into the tundish can be adjusted, the degree of freedom of the installation location of the plasma heating device can be increased, and a working space around the tundish 2 can be sufficiently secured.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0019]

As described above, according to the plasma molten steel heating apparatus of the present invention, (1) the connecting portion between the plasma torch and the torch lifting device and the connecting portion between the torch lifting device and the swivel base of the torch lifting device. By providing a function to adjust the mounting angle and adjusting the support angle of the plasma torch and the insertion angle for inserting the plasma torch into the tundish, the degree of freedom in the installation location of the plasma heating device is expanded, and the tundish surroundings are expanded. Will be able to secure a sufficient working space. (2) In the drive system of the torch lifting device, it is possible to protect the mechanical components from being deformed and the electrical components from being broken due to radiant heat from the tundish. (3) A clutch is provided in the drive system of the torch lifting device, and a counterweight is provided so that the torch support arm can always be lifted. Therefore, it is possible to reliably retract the lift limit in case of a power failure. And the like.

[Brief description of the drawings]

FIG. 1 shows a conceptual diagram of a plasma heating apparatus according to the present invention.

FIG. 2 is an explanatory view showing a support angle and an insertion angle of the plasma torch according to the present invention.

FIG. 3 is a partial view and an AA arrow view showing an example of a torch support angle adjusting mechanism.

[Explanation of symbols]

 1 Plasma torch 2 Tundish 3 Molten steel surface 4 Torch support arm 5 Torch lifting device 6 Torch turning device 7 Working floor 8 Torch lifting drive force unit 9 Clutch 10 Jack screw 11 Wire 12 Counterweight 13 Torch support angle adjustment mechanism 14 Torch insertion Angle adjustment mechanism 15 Traveling moving body 16 Rotating shaft 17 Turning base 18 Torch handling part 19 Fixing screw 20 Turnbuckle θ1 Support angle θ2 Insertion angle

Claims (2)

[Claims] 1. A plasma heating device for molten steel in a tundish of a continuous casting facility comprising a torch lifting device for supporting and lifting a plasma torch, a torch swiveling device for swiveling the plasma torch and the torch lifting device integrally, A torch and a torch lifting device are connected by a torch support arm, a torch mounting angle adjusting mechanism is arranged at the torch support arm and plasma torch connecting part, and a connection part between the torch lifting device and the turning base of the torch turning device. A plasma heating device characterized in that a torch insertion angle adjusting mechanism is provided in the. 2. A torch elevating device and a torch elevating drive force unit are connected by a clutch, and a traveling moving body for supporting the plasma torch and the torch support arm on the torch elevating device is hung by a wire, and the wire is suspended. The plasma heating apparatus according to claim 1, wherein one end of the plasma torch is raised and retracted in the event of a power failure by connecting one end to a counterweight.