JPS6262182A - Duplex type arc furnace facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiple arc furnace facility in which two arc furnaces are operated alternately.

(Prior art) General arc furnace equipment is configured such that the furnace body is installed on a tilting floor, and the electrodes and furnace lid related equipment can be rotated horizontally as appropriate from the top of the furnace body to a predetermined standby position. are doing. In double arc furnace equipment, electrodes and
It also serves as furnace lid-related equipment, allowing electrodes and furnace lids to be moved onto the furnace body as needed.

In conventional multiple arc furnace equipment, the following two methods have been proposed as methods for moving the electrodes and furnace lid.

(A) Two furnaces are installed on the same tilting floor, and a rotating bed that is shared by the two furnaces and equipped with electrodes and a lid lifting mechanism is installed in the center between the inner furnace bodies on the same tilting floor. A method that tilts during rotation.

(B) A method in which a tilting bed is provided for each furnace separately, a hydraulic ram is installed in the center between the inner furnace bodies, and the furnace lid and electrode-related equipment and structures are pushed up and rotated by the hydraulic ram so that the two furnaces can be shared.

[Problem that the invention seeks to solve]

However, in the case of method (A), since the two furnaces are installed on the same tilting floor, there is a drawback that even the furnace on the standby side (preheating side), which does not require tilting, is tilted. In other words, the furnace on the standby side is charged with scrap and preheated, and tilting it means that the unmelted raw material scrap is transferred to the furnace wall by 1.
! ! There are disadvantages such as: (1) adverse effects such as deformation of the furnace shell plate due to a large load being applied to the furnace wall; and (2) uneconomical because unnecessary tilting energy is consumed.

In addition, in the case of method (B), the equipment and structures of the furnace lid and M pole are pushed up with a ram and rotated, and the load is transferred to the furnace body and the ram is lowered. There are disadvantages such as: equipment and structures entrusted to the furnace body are easily affected by heat from the furnace body; (1) a large bending load is applied to the hydraulic ram, which tends to cause galling; and (2) the furnace body is easily deformed.

An object of the present invention is to provide a multiple arc furnace facility that eliminates the drawbacks of the above two systems.

[Means for Solving the Problems] The present invention solves the above problems by installing two furnaces on different adjacent tilting floors, and using electrodes and furnace lids that are common to both furnaces. It is characterized by a structure in which a pedestal equipped with related equipment is movable on an inwardly tilting floor.

Further, the second invention is such that the pedestal equipped with the electrode/furnace lid related equipment is placed on a trolley that can run and move on an inwardly tilting floor,
It is also characterized in that the pedestal is provided so as to be able to rotate in the horizontal direction with respect to the cart.

[Effect]

When performing arc melting operation on one furnace with A and the other furnace with 8, move the pedestal to the tilting floor installed on the operating side of furnace A, fix it, and remove the electrodes and furnace lid. Set the equipment to furnace A and start operation. During this time, furnace B
Now, perform preheating operation, etc.

During operation, when the tilting floor is operated to tilt the furnace A, the pedestal on the tilting floor also tilts. When the operation of furnace A is finished and furnace B is to be operated next, the pedestal is moved to the furnace B.
The furnace moves onto the tilting floor where the furnace B is installed, and the furnace B starts operating in the same way as the furnace A.

〔Example〕

The present invention will be explained in detail below.

FIG. 1 shows an embodiment of the present invention, and the reference numeral 1 in the figure shows an embodiment of the present invention.
A and 1B are the furnace bodies, and 2 is a lid that is shared by the two furnaces. Each of the furnace bodies IA and IB is installed on independent and adjacent tilting floors 3A and 3B. Reference numeral 4 indicates a rotating floor (frame) that is shared by the two furnaces, and 5 indicates a furnace lid lifting arm that projects upward from the rotating floor 4. Further, 6 and 7 are electrodes and furnace secondary conductors that are shared by the two furnaces, respectively, and 8 is a flexible cable that connects the power source (furnace transformer) 9 that is shared by the two furnaces and the furnace secondary conductor 7. It shows.

Each furnace body 1A, IB and each tilting floor 3A, 3B are provided so as to be symmetrical with respect to each other, including a furnace lid 2, a furnace lid lifting arm 5. Electrode 6. The electrodes and furnace lid related equipment that are shared by the two furnaces, such as the secondary conductor 7 on the furnace, are attached to these symmetrical furnace bodies 1A and 1B.
It is set symmetrically with respect to That is, when setting the electrodes and furnace lid related equipment that were set for the furnace body 1A to the furnace body B, the equipment can be set by rotating the rotating bed 4 at a predetermined angle around the point p on the axis of symmetry 1. It is now possible to do so.

A deck 10 is provided around the tilting floors 3A and 3B. This deck 10 has tilting floors 3A, 3 in a horizontal state.
[It is on the same level as 3. Deck 10 and inward tilting floor 3
On the top surface of A and 3B, there is a circular orbit 11.11 centered on point P.
A and 11B are installed. In this case, the tilting floor 3A,
The circular orbits 11A and 11B on the deck 3B are connected to the orbit 11 on the deck 10 with the tilting floors 3A and 3B being horizontal, respectively.

Further, four wheels 12 are provided on the lower surface of the revolving floor 4 on which the electrode/furnace lid related equipment is mounted so that it can run on the circular tracks 11.11A and 11B.

Incidentally, a known means is provided between the tilting floors 3A, 3B and the rotating floor 4 to fix the rotating bed 4 in rotation and rotation during operation. Swiveling fixation refers to fixing the rotating bed so that it does not move when the furnace body is tilted, and is generally fixed by inserting a bottle from the rotating bed into the tilting bed (cylinder drive).

In addition, tilting fixation refers to fixing the rotating bed to prevent it from lifting up when the furnace body is tilted, and generally an L-shaped hook is attached from the rotating floor, and an inverted hook is attached to the tilting floor. The structure is such that both hooks engage in a fixed position.

Next, the operation of the multiple arc furnace equipment having the above configuration will be explained.

Now, FIG. 1 shows a state in which the furnace body 1A side is in operation and the furnace body 1B is in the early stages. At this time, the rotating floor 4 is the tilting floor 3
The electrode and furnace lid related equipment are set on the furnace body 1A. In this state, if the furnace body 1A is tilted, the rotating bed 4 on the tilting bed 3Δ will also tilt in the same way.

When the operation of the furnace body 1A is completed and the operation of the furnace body 1B is started, first, both the tilting beds 3A and 3B are kept horizontal and the tracks 11A and 11.118 are connected. Then, the rotating bed 4 is moved to the tracks 11A, 11. It runs on IIB and moves onto the tilting floor 3B as shown by the arrow (a). After moving, the rotating bed 4 is rotated and fixed relative to the tilting bed 3B, and the electrodes and furnace cover related equipment are set in the furnace body 1B, and operation is started.

In this way, in this equipment, the rotating bed 4 is connected to the track 11.
By simply moving along lines 11A and 11B, the electrode/furnace lid related equipment can be automatically moved to a fixed position relative to the furnace. In addition, when performing electrode joint work, etc., the inner furnace bodies IA, 1B
The work can be carried out by moving the rotating bed 4 to an intermediate position.

In the case of this embodiment, a case is shown in which the rotating bed 4 is rotated around a substantial point P.

In other words, the case where the orbits 11.171A and 11B are circular orbits is shown. However, depending on the set position of the electrode/furnace lid related equipment with respect to the furnace bodies 1A and IB, it is not necessarily necessary to configure the furnace to run on a circular orbit.

In that case, it would be more appropriate to call it a trestle rather than a revolving floor.

Next, another embodiment of the present invention will be described with reference to FIG.

In the equipment of this embodiment, wheels are not directly provided on the rotating floor (frame) 4, and the rotating floor 4 is placed on a truck 13 having wheels 12 so as to be able to rotate horizontally about a pivot center Q. ,
This cart 13 is the furnace body IA.

It is characterized by being configured so that it can run and move in the direction in which the lines 1B are lined up.

The wheels 12 in this case are oriented in a direction in which they can move linearly in the direction in which the furnace bodies 1A, 1B are lined up. Also, this embodiment does not have a circular orbit unlike the previous embodiments. Other points are similar to the embodiment shown in FIG. 1, so the same reference numerals as in FIG. 1 are used.

In the equipment of this embodiment, for example, from the furnace body 1A to the furnace body IB
When moving the electrode/furnace lid related equipment, first, from the state shown in FIG. 2, move the moving cart 13 as shown by the arrow (b) and place the moving cart 13 on the tilting floor 3B. Next, the rotating bed 4 on the movable trolley 13 is rotated around the point Q as shown by the arrow (c), and the electrodes and equipment related to the furnace n are set on the furnace body 1B.

Then, the operation of the furnace body 1B begins.

According to the equipment of this embodiment, when opening and closing 2 in the furnace for additional charging of raw materials, it is only necessary to rotate only the rotating bed 4 while keeping the movable cart 13 fixed, so the opening and closing time is short. I'm done. In addition, when moving the rotating bed 4 to the other furnace,
Since the movement route is short, it has the advantage of being able to move C for a short time.

In the above two embodiments, the present invention is applied to three-phase AC arc furnace equipment, but the present invention can of course also be applied to DC arc furnace equipment.

〔Effect of the invention〕

According to the present invention, the following effects are achieved.

■Since the frame equipped with electrodes and furnace cover-related equipment is configured to be movable, there are no restrictions on the arrangement of the shutters, making it flexible and allowing for wide spacing between the shutters.

This allows you to secure sufficient work space.
Does not impair workability.

■Since each inner furnace is mounted on an independent tilting floor, each furnace body can be tilted independently.

Therefore, unlike the conventional system in which the inner furnace is provided on the same tilting floor, there is no need to tilt the 1 liter furnace (on the preheating side) that is on standby and does not require tilting, which is safe and economical.

■Since the electrodes and furnace lid related equipment are installed on the pedestal, no load is applied to the furnace body, there is no effect on the furnace body, and it is less susceptible to heat effects from the furnace body.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of the present invention, and FIG. 2 is a plan view of another embodiment. 1A, 1B...Furnace body, 2...Furnace cover, 3
A, 3B...Tilting floor, 4...Rotating floor (
mount), 5... Furnace lid-lifting arm, 6...
...Electrode, 7...Furnace/1 secondary conductor, 8...
...Flexible cable, 9...Power supply, 10...
...Detsuki, 11. IIA, 11B...Circular orbit, 12...Wheels, 13...Moving trolley, P, Q...Turning center. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 1

Claims (2)

[Claims] (1) The two furnaces are installed on separate adjacent tilting floors, and a pedestal equipped with electrodes and furnace lid-related equipment common to both furnaces is configured to be able to run and move on both tilting floors. Dual arc furnace equipment. (2) The two furnaces are installed on different adjacent tilting floors, and a stand equipped with electrodes and furnace lid-related equipment for both furnaces is placed on a trolley that can be moved on both tilting floors. Compound arc furnace equipment characterized by being mounted so that it can rotate horizontally.