JPH091298A - Connecting device of power supply circuit for tundish plasma heating device - Google Patents

Abstract

PURPOSE: To obtain an elevation type pincer machine capable of coping with one cylinder by forming a power feeding circuit with pinching a fixed terminal by upper/lower moving terminals arranged to an upper/lower pinching part so as to eliminate electric discharge due to contacting defect. CONSTITUTION: Above and under a flat fixed terminal 9 connected to a furnace bottom electrode 7 through a water cooling cable 8, upper/lower moving terminals 11, 12 of V shaped tip connected to a braided conductive body 10 are arranged and pinching action is executed by actuation of a cylinder. The cylinder is actuated from open state in pushing direction and then the upper moving terminal 9 is descended to be brought into contact with the fixed terminal 9. Further when the actuation in pushing direction is continued, the lower moving terminal 12 and cylinder 15 are ascended and then the fixed terminal 9 is brought into contact with the lower moving terminal 12, the fixed terminal 9 is pinched with the upper/lower moving terminals 11, 12 and then a furnace bottom electrode side power feeding circuit is formed. Thus, the device is made possible with short stroke driving one piece of the cylinder 15 for the upper/ lower moving terminals 11, 12 so as to reduce a weight and size of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit connecting device for a plasma heating device used for heating molten steel in a tundish during continuous casting.

[0002]

2. Description of the Related Art In continuous casting of steel, an operation of heating molten steel and appropriately maintaining the temperature is performed, and a plasma heating device may be used as the molten steel heating means. FIG. 4 is an explanatory diagram showing an example of a plasma heating device provided in a tundish. In this heating device, a plasma torch 2 which is a cathode is arranged above a tundish 1,
The furnace bottom electrode (anode) 7 is arranged with its end portion in contact with the molten steel 23, and a plasma arc 24 is generated between the plasma torch 2 and the molten steel 23 to heat the molten steel 23. Reference numeral 35 is a power generator, 25 is an elevator for attaching and lifting a plasma torch, 5 is a tundish car, and 26 is a tundish immersion nozzle.

By the way, the plasma torch 2 attached to the elevator 25 is directly connected to the power source generator 35 by the power cable 27, but the feeder circuit on the furnace bottom electrode 7 side is provided with a connector 28 for division. There is. The reason for this is that tundish 1 is often used in continuous casting.
This is because the exchange is performed. When the tundish 1 is replaced, the plasma torch 2 can be moved up and down with the power supply circuit connected, which allows the plasma torch 2 to be inserted and removed, but the furnace bottom electrode 7 moves because it is fixed to the tundish 1. Therefore, each time the tundish 1 moves, the circuit can be connected or disconnected.

The connecting device for the feeder circuit on the bottom electrode 7 side is as follows. A fixed terminal 29 connected to the furnace bottom electrode 7 is attached to the upper surface of the tundish 1, and a power supply cable 27 guided from a power supply generation device 35 has a movable terminal via a water cooling cable 31 in a cable guide 30. Three
2 are connected. Then, the movable terminal 32 is moved in the vertical direction together with the water-cooling cable 31 and the elevating frame 34 of the movable terminal by the hoisting machine 33 of the movable terminal, and the movable terminal 32 and the elevating frame 34 are attached to the fixed terminal 29 by gravity. Therefore, even if the tundish 1 moves up and down, a circuit connection failure does not occur.

[0005]

The atmosphere in the vicinity of the tundish 1 in continuous casting is caused by a splash and a variety of factors when the molten steel is supplied to the tundish 1 from a molten steel ladle (not shown) above the tundish 1. There is a bad environment due to indoor dust. Under such circumstances, in the above-mentioned conventional connecting device, the elevating frame 34 and the movable terminal 3 are used.
Although the two terminals are crimped by their own weight, since the contact surfaces of the fixed terminal 29 and the movable terminal 32 are horizontal and face upward, the splash or dust accumulates on the fixed terminal 29, resulting in poor contact. Sometimes.

Further, the above-mentioned conventional connecting device has a hoisting machine 33 and a lifting frame 3 above the tundish 1 on the pouring operation side.
4 and the cable guide 30 and the like are indispensable, space constraints are obliged, and there are many constituent elements, so there is a problem in terms of equipment cost.

[0007] The present invention has been made to solve the above problems, and the object thereof is to provide:
It is an object of the present invention to provide a compact and inexpensive connecting device for a power supply device for a tundish plasma heating device, which does not cause a circuit connection failure and can cope with space restrictions.

[0008]

In order to achieve the above object, the present invention provides a plate-shaped fixed terminal which is horizontally installed above a fixed deck of a tundish car and connected to a bottom electrode of a furnace via a water cooling table. It is attached to the upper and lower pinching parts of the lift type pincer placed on the fixed floor and the casting position. It follows the inclination of the fixed terminal by receiving the pinching force via the spherical seat and the buffer spring between the pincer and the pincher. At the same time, by sandwiching the fixed terminals by the upper and lower movable terminals having tip shapes capable of making line contact, a power supply circuit that does not cause contact failure is formed.

Further, in the above-mentioned pincer, the upper and lower movable terminals are attached to the tip of the cylinder rod and the inside of the cylinder clamp arm, and the upper movable terminal is first placed on the fixed terminal by the stroke of this cylinder. It will be in a state of being. Then, the further cylinder stroke raises the cylinder and the lower movable terminal along the guide post, and the lower movable terminal is crimped to the fixed terminal. As a result, the vertically movable terminal is configured to pinch the fixed terminal by the pressing force of the cylinder, thereby forming a compact and inexpensive power supply circuit that can cope with space constraints.

[0010]

In the power supply circuit connecting device of the present invention, the fixed terminal is horizontally arranged on the upper part of the tundish car fixed deck, and the fixed terminal and the bottom electrode are connected by the water cooling cable. Even if it goes up and down, the water-cooled cable only follows up and down the tundish, and the fixed terminal does not go up and down. Therefore, since the positional relationship between the movable terminal and the fixed terminal does not change, the connection is not hindered. Furthermore, since the movable terminal is an up-and-down type impact mechanism, the connection surface between the movable terminal and the fixed terminal is a two-sided connection.
The number of connection terminals can be cut in half.

Further, the upper and lower movable terminals of the pinching structure can be connected to follow the inclination of the fixed terminal by the spherical seat and the buffer spring, and the tip of the movable terminal is made into a V-shape so as to be in line contact. Therefore, the contact portion can secure a strong surface pressure, and since the connection is made on the lower surface that is less susceptible to splash and dust, there is no problem of discharge due to poor contact.

The lift-type pinching machine disposed on the fixed floor at the casting position is driven by a cylinder and has a structure in which the fixed terminal is sandwiched by the movable terminals. Further, the upper and lower movable terminals are attached to the tip of the cylinder rod and the inside of the cylinder clamp arm, and when the fixed terminal is pinched, the upper movable terminal is first placed on the fixed terminal due to the cylinder stroke. Then, the further cylinder stroke raises the cylinder and the lower movable terminal along the guide post, and the lower movable terminal is crimped to the fixed terminal. As a result, the vertically movable terminal has a mechanism for pinching the fixed terminal by the cylinder pressing force. For this reason, the drive cylinder is not required for each of the upper and lower movable terminals, and only one side is required. Moreover, since the fixed terminal is at a constant level regardless of the lifting and lowering of the tundish, the gap between the fixed terminal and the movable terminal is in the tundish traveling. Since a small one that prevents the interference of the above can be used, the cylinder stroke can also be a small stroke, which enables a compact and inexpensive power supply circuit connecting device that can also cope with space constraints.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view schematically showing an arrangement state of an embodiment according to the present invention. 1 is tundish, 2
Is a plasma torch, 3 is an elevator of the plasma torch, and 4 is a connecting device (pinching machine) for the power supply circuit on the bottom electrode side.

In the connecting device of this embodiment, a flat plate-shaped fixed terminal 9 connected to a furnace bottom electrode 7 via a water cooling cable 8 is provided above the fixed deck 6 of the tundish car 5.
Are arranged horizontally. Further, above and below the fixed terminal 9, an upper movable terminal 11 and a lower movable terminal 12 to which the knitting conductor 10 is connected are arranged.

2 and 3 show a pinching structure of a terminal connecting portion in the power supply circuit connecting device of FIG. 1, FIG. 2 is an enlarged view when opened, and FIG. 3 is an enlarged view when connected. Reference numeral 9 is a fixed terminal of a flat plate made of copper, and 11 and 12 are movable terminals made of copper having a V-shaped tip.

The vertically movable terminals 11 and 12 are attached to the elevating pincer 4 together with the knitting conductor 10. The pincer 4 is a lifting guide post 14 suspended from a fixed floor 13.
And a cylinder 15 having an upper movable terminal 11 at the tip of the rod for controlling lifting and pinching, and a clamp arm 17 having the cylinder 15 and the lower movable terminal 12 and provided with an elevating guide 16. In addition, when the electrodes are open, the lifting guide 1
The bottom surface of 6 is placed on the movable terminal positioning block 36 below the guide post 14 by its own weight to secure a gap with the fixed terminal 9 on the tundish car fixed deck 6.

The upper and lower movable terminals 11 and 12 perform a pinching operation by the operation of the cylinder 15. Specifically, when the cylinder 15 is operated in the pushing direction from the open state, the upper movable terminal 11 descends and comes into contact with the fixed terminal 9. Since the cylinder 15 in the middle of the stroke still continues to operate in the pushing direction, the clamp arm 17 having the lower movable terminal 12 and the cylinder 15 itself ascend with respect to the fixed terminal 9 along the guide post 14. Therefore, the lower movable terminal 12
Will rise and come into contact with the fixed terminal 9. As a result, even in this state, since the cylinder 15 has a stroke allowance, the vertically movable terminals 11 and 12 are not attached to the cylinder 15.
The fixed terminal 9 is pinched by the pressing force of, and a power supply circuit on the furnace bottom electrode side is formed.

On the rod tip of the cylinder 15 and on the inside of the clamp arm 17, there is attached a male side spherical seat 19 on the circumference of which a buffer spring 18 can be attached in order to freely support the movable terminals 11 and 12. On the movable terminals 11 and 12 side, a female-side spherical seat 20 that makes spherical contact with the movable terminals 11 and 12 and on which a buffer spring 18 can be attached is attached to the movable terminals 11 and 12 via an insulating material 21. It is fixed at 22.

The male side spherical seat 19 and the female side spherical seat 20
A plurality of buffer springs 18 are provided between the movable terminals 11,
The structure is suspended or suspended so that 12 can be horizontally tilted. When the vertically movable terminals 11 and 12 pinch the fixed terminal 9 due to the spherical structure and the buffer spring system, the tilting of the fixed terminal 9 can be freely tracked and pinched.

[0020]

As described above, according to the power supply circuit connecting device of the present invention, since the fixed terminal is attached to a place unrelated to the lifting and lowering of the tundish, a mechanism for following the lifting and lowering of the tundish is provided. It is not necessary and the initial reliable terminal connection can be maintained. Since the movable terminal is a lifting type pinching mechanism, the terminal connection surface is a connection with two upper and lower surfaces, the number of connection terminals can be halved and it is compact, and the connection on the lower surface that is not easily affected by splash, dust, etc. Also, the problem of discharge due to poor contact can be solved. Since the cylinder body is a pinching mechanism that moves up and down, the drive source need only be one cylinder for the vertically movable terminals.
It has a simple structure with a buffer spring and a spherical seat, and the gap between the fixed terminal and the movable terminal when opened is the minimum that prevents interference during tundish running, so the cylinder stroke can be reduced and space is restricted. However, it is possible to reduce the weight and size so that it is possible to contribute to cost reduction.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an arrangement state of an embodiment according to the present invention.

FIG. 2 is an enlarged view showing a pinching structure of a terminal connecting portion in the power feeding circuit connecting device of FIG. 1, when the terminal connecting portion is opened.

FIG. 3 is an enlarged view of the pinching structure in FIG. 2 when connected.

FIG. 4 is an overall side view showing an example of a conventional plasma heating apparatus.

[Explanation of symbols]

 1 Tundish 2 Plasma torch 3 Elevator of plasma torch 4 Connection device (feeder) for the bottom side electrode side power supply circuit 5 Tundish car 6 Tundish car fixed deck 7 Bottom electrode 8 Water cooling cable 9, 29 Fixed terminal 10 Editer Conductor 11, 12, 32 Movable terminal 13 Fixed floor 14 Elevating guide post 15 Cylinder 16 Elevating guide 17 Clamp arm 18 Buffer spring 19 Male spherical surface seat 20 Female spherical surface seat 21 Insulation material 22 Bolt / nut 23 Molten steel 24 Plasma arc 25 Plasma torch lift 26 Immersion nozzle 27 Power cable 28 Power supply circuit connection device 30 Cable guide 31 Water cooling cable 33 Hoisting machine 34 Lifting frame 35 Power generator 36 Movable terminal positioning block

Front Page Continuation (72) Inventor Kazuo Ayagaki 1-1-51 Mukohara-oki, Oita-shi, Oita Taihei Kogyo Co., Ltd. Oita Branch (72) Inventor Yoshitaka Yamaguchi 46-59, Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Plant Design Co., Ltd. (72) Inventor Nobuyoshi Hirotsu 46-59 Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture Nippon Steel Corporation Machinery & Plant Division

Claims (3)

[Claims] 1. A fixed deck of a tundish car,
A fixed terminal connected to the furnace bottom electrode via a water-cooling table is provided.On the other hand, an elevator type pincer connected to a power generator is placed on the fixed pouring position floor. A connecting device for a power supply circuit for a tundish plasma heating device, wherein a movable terminal is provided and the fixed terminal is sandwiched by the vertically movable terminals to form a power supply circuit. 2. A spherical bearing is formed in each of the upper and lower pinching portions of the lifting type pincer, and upper and lower movable terminals are arranged through a buffer spring, and the tip shape of the movable terminal is line-contacted. The connection device of the power supply circuit for the tundish plasma heating device according to claim 1, wherein the connection device has a shape that is possible. 3. A vertically movable terminal is provided on each of the clamp arms, a cylinder is connected to the upper movable terminal, and an elevating guide is provided at the clamp arm.
An elevating guide post for guiding the elevating guide is installed outside the system, and a positioning block is provided at the lower end of the guide post, and the upper movable terminal is moved by the cylinder,
The device for connecting a power supply circuit for a tundish plasma heating device according to claim 1 or 2, wherein the clamp arm is moved integrally and the fixed terminal is pinched by the upper and lower movable terminals. .