JP2594776Y2 - Power supply circuit connection device for tundish plasma heating device - Google Patents

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 equipped with a plasma heating device for heating molten steel using a plasma torch on a tundish during continuous casting, and a power supply circuit for the tundish plasma heating device. Connection device.

[0002]

2. Description of the Related Art The influence of casting temperature during continuous casting causes deterioration of cast slab quality, clogging of nozzles, and a great obstacle. As a countermeasure, a temperature control operation is performed to heat the molten steel in the tundish to maintain the molten steel at a target temperature. For this heating, a high-temperature heat source is obtained, and a plasma heating apparatus with a clean atmosphere is effective.

[0003] In this plasma heating apparatus, a negative (or positive) pole plasma torch support device is provided above a tundish, and electrodes are arranged so that molten steel on the tundish side becomes a positive (or negative) pole. Is a device for generating a plasma arc between a plasma torch and molten steel to heat the molten steel.

[0004] The tundish is mounted on a tundish car, and the plasma torch can be moved up and down by fixed columns. On the tundish side, which is frequently moved and replaced, it is necessary to provide an electrode connection portion so that it can be sequentially connected to the power supply side of the tundish car side. As the power supply means, there has been a case in which a connector is connected and disconnected by connecting and disconnecting a cable manually as needed. Since the power supply current for plasma heating is large, usually about 5000 A to 7000 A, a flexible cable or a water-cooled cable is used as the electrode wiring conductor.

[0005] To attach and detach the connector manually,
Usually, a plurality of cables must be connected, and the connection time is long. When a water-cooled cable is used, a heavy one is difficult to handle, and a long time is required for connection work.

Therefore, for example, Japanese Unexamined Utility Model Publication No. 3-120946 discloses a connection device of a power supply circuit for a tundish electric heating device shown in FIG. The feature of this technique is that the connecting device includes a fixed contact body 6a formed of a metallic flat plate fixed to the tundish 2 and a movable contact body 5a supported on a fixed floor and capable of reciprocating in the normal direction of the fixed contact body 6a. The opening / closing action surface of the electric circuit is a surface formed by the traveling axis and the elevating axis of the tundish car. The movable contact body side is made of an alloy, and is connected to a reciprocating device so as to be movable on two axes.

[0007]

[Problems to be Solved by the Invention] In order to move a tundish containing molten steel to a casting position, heat the power supply and start casting at an appropriate molten steel temperature, the preparation work is made as simple as possible. It is important to reduce the preparation time.

Needless to say, the equipment cost is minimized, but the following problems are raised to solve this problem. Before loading and unloading the tundish, it takes time to reciprocate the moving connection. A driving device for reciprocating the moving-side connecting body is required, and equipment costs are required. Since the connecting body slides up and down, the connecting body becomes a consumable and requires maintenance cost. Requires personnel to operate the mobile connection. As described above, there are problems of time, equipment cost, and personnel.

[0009] The present invention has been made to solve the above problems, and the purpose thereof is as follows.
An object of the present invention is to provide a connection device for a power supply circuit for a tundish plasma heating device, which can automatically connect a power supply circuit for a tundish plasma heating device simply by loading a tundish on a tundish car.

[0010]

Means for Solving the Problems The present invention proposes to achieve the above-mentioned object, and its gist is as follows.

(1) A contact plate provided with a power supply bus bar is provided on the lower surface of the tundish loaded on the tundish car, and a plurality of contacts capable of contacting the contact plate are provided on an upper portion of the tundish car. provided is supported by resilient support, and a tip shaped to substantially line contact with the contacts and the contact plate, and the contactor by the weight of the tundish
A contact device for a power supply circuit for a tundish plasma heating device, wherein the contact plate is pressed against the contact plate .

(2) A support provided on the tundish car
When placing a tundish on the contact plate above the holding frame
A contact that presses against the support frame
Provide a centering pin for centering when placing the
Ball bearing that can be moved two-dimensionally on the lower surface of the support frame
Wheels, and the support frame is
That a spring for restoration that always restores to the normal position has been installed.
A connection device for a power supply circuit for a tundish plasma heating device according to the above (1), characterized in that:

[0013]

[Function] Since the present invention has the above structure, when a tundish containing molten steel is loaded on a tundish car,
The contact plate on the lower surface of the tundish contacts the plurality of contacts supported by the elastic support on the upper portion of the tundish car, and the power supply circuit is automatically connected.

In the present invention, a plurality of contacts are provided in a divided manner, and each of the contacts is supported by the elastic support, so that the contacts reliably contact the contact plate. In addition, since the tip of the contact is shaped like a roof and sharpened so as to make almost line contact, a strong contact pressure can be secured at the contact portion, and there is no problem of electric discharge due to poor contact.

Further, the support frame for supporting the contacts is provided with wheels made of ball bearings so as to be movable in all directions in a plane, and the support frame is provided with centering pins for centering the tundish. So
The tundish and centering can be reliably performed, and the contact plate on the lower surface of the tundish and the contact can be surely brought into contact with each other at a fixed position.

Since the restoring spring for restoring the support frame to the home position is provided, even if the support frame on which the contact is mounted is slightly displaced from the tundish when centering, it can be restored to the home position. In addition, it is now possible to replace another tundish without any problems.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention;

As shown in the overall view of the tundish plasma heating apparatus in FIG. 1, a fixed-side connecting member 6 is provided on a tundish car through a bus bar 7, and a bus bar 8 is provided immediately above the fixed connecting member. The moving-side connector 5 is attached to the lower surface of the tundish 2, and when the tundish 2 is loaded on the tundish car 1, the moving-side connector 5 and the fixed-side connector 6 are brought down and in contact with each other.

In a state where the molten steel 4 is contained in the tundish 2, an arc is generated between the externally provided plasma torch 3 and the molten steel 4, so that the molten steel 4 passes through the bus bar 8,
A current flows from the moving-side connector 5 to the bus bar 7 through the fixed-side connector 6, and the power supply circuit becomes a closed circuit.

When the tundish 2 is lifted after the casting is completed, the movable connecting member 5 and the fixed connecting member 6 are separated from each other.
The power supply circuit becomes an open circuit.

FIGS. 2, 4 and 6 show an example of the movable connecting body on the tundish side of the present invention, and FIGS.
FIG. 7 shows an example of the fixed connection body on the tundish car side of the present invention. 2 and 3 are side views, FIGS. 4 and 5 are front views, and FIGS. 6 and 7 are plan views of one side.

A contact plate 23 obtained by sintering a tungsten alloy on a flat copper plate to which a bus bar 8 is connected is sandwiched by an insulating plate 10 and attached to a mounting table 9, and the mounting table 9 is mounted below the tundish 2. .

Therefore, by loading the tundish 2 on the tundish car 1, the contact plate 23 of the movable side connection 5 is fixed to the fixed side connection 6 of the tundish car 1.
The connector 13 provided with the compression spring 14 on the back surface is pressed down to make contact.

A base 19 is provided below the frame 15 of the fixed connection body 6 via a ball bearing 16, and an extension spring 17 that operates in a horizontal direction is mounted inside the base 19.

Further, the base 19 is attached to the upper surface of the tundish car 1 through an insulating plate 20.

As shown in FIGS. 4 and 5, a flat contact plate 2 is provided.
When the tundish 2 is mounted via the mounting table 9 and the moving-side connecting body 5 provided with the moving-side centering pin guides 11 at both ends, the moving-side Guided by the pin guide 11, the fixed-side centering pins 12 at both ends are inserted, and as a result, the moving-side contact plate 23 and the fixed-side contactor 13 come into contact with each other.

[0027]

According to the present invention, the power supply circuit can be connected at the same time only by placing the tundish on the tundish car, and the power supply preparation work is not required.

Also, as shown in FIG. 7, the contact method of the contact 13 is a line contact, and furthermore, a block of a plurality of fixed contacts is formed into an aggregate of blocks, so that the tundish is deformed or Problems such as discharge due to poor contact can be solved.

With the above advantages, it is possible to greatly reduce the time required for work preparation, save labor, and reduce equipment costs.

[Brief description of the drawings]

FIG. 1 is an overall view of a tundish plasma heating apparatus according to the present invention.

FIG. 2 is a side view of the movable connector according to the embodiment of the present invention;

FIG. 3 is a side view of the fixed connector according to the embodiment of the present invention;

FIG. 4 is a front view of the moving-side connector according to the embodiment of the present invention;

FIG. 5 is a front view of the fixed connector according to the embodiment of the present invention;

FIG. 6 is a plan view of one side of the moving-side connector according to an embodiment of the present invention;

FIG. 7 is a plan view of one side of the fixed connection body according to the embodiment of the present invention;

FIG. 8 is an overall view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tundish car 2 Tundish 3 Plasma torch 4 Molten steel 5 Moving side connection body 5a Movable contact body 6 Fixed side connection body 6a Fixed contact body 7 Bus bar 8 Bus bar 9 Mounting stand 10 Insulator 11 Moving side centering pin guide 12 Fixed side Centering pin 13 Contact 14 Compression spring (elastic support) 15 Frame (contact support frame) 16 Ball bearing 17 Extension spring (restoration spring) 18 Busbar mounting plate 19 Base 20 Insulating plate 21 Guide stopper 22 Contact tip 23 Contact Plate 24 Intermediate Conductor 25 Connector 26 Power Cable 27 Air Cylinder

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Osamu Wakita 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Machinery & Plant Business Department (72) Inventor Yoshitaka Yamaguchi Tobata, Kitakyushu-shi, Fukuoka 46-59, Naka-ku, Nippon Steel Plant Design Co., Ltd. (72) Inventor Takashi Tochihara 46-59, Naka-hara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Plant Design Co., Ltd. (56) References JP, A) Hikaru Hira 3-120946 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 11/10 310 B22D 41/01

Claims (2)

(57) [Scope of request for utility model registration] 1. A contact plate having a power supply bus bar attached thereto is provided on the lower surface of a tundish loaded on a tundish car, and a plurality of contacts capable of contacting the contact plate are provided on an upper portion of the tundish car. provided to support the support, and a tip shaped to substantially line contact with the contacts and the contact plate, the said contactor by the weight of the tundish
A connection device for a power supply circuit for a tundish plasma heating device, wherein the contact plate is in pressure contact . 2. A support fin provided on said tundish car.
When placing a tundish on the contact plate above the frame
A contact is provided, and a tundish is attached to the support frame.
A centering pin is provided for centering when the
Ball bearing that can be moved flat on the lower surface of the frame
Wheels, and the support frame is
It is noted that a restoring spring that always restores
The connection device for a power supply circuit for a tundish plasma heating device according to claim 1 .