JPH0311675Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the improvement of a multiple arc furnace equipped with two furnace bodies and a set of furnace lids and electrode devices. It has been made possible.

[Conventional technology]

In a steelmaking arc furnace that uses scrap as a raw material, operation is carried out by repeating the basic cycle of inputting scrap, melting by energizing, removing slag (once or multiple times), and tapping.

In the operation of such an arc furnace, a major issue is shortening the operation cycle time by shortening the scrap input time, slag removal, and steel tapping time.

Therefore, as an alternative to a single furnace that uses one set of furnace lid and electrode device for one furnace body, a multiple arc furnace 1 as shown in FIG. 4 has been adopted.

This double arc furnace 1 has furnace bodies 3, 3a installed on two adjacent tilting beds 2, 2a that enable slag tapping and steel tapping. , 1 that can be pivoted above 3a
A rotating floor 6 on which a set of furnace lids 4 and an electrode device 5 are attached is installed.

In operation, after loading scrap into one furnace body 3, the rotating bed 6 is rotated, the furnace lid 4 and the electrode device 5 are attached, and melting by arc heat is started.

When a predetermined amount of melting is completed, the furnace cover 4 and the electrode device 5 are rotated and retracted, and slag removal and tapping are performed.

On the other hand, in the other furnace body 3a, scrap is input during melting in the furnace body 3, preparation for melting is proceeding, and the furnace body 3 is in the tapping state and the furnace cover 4 and electrode device 5 are no longer required. When the temperature is reached, the rotating bed 6 is rotated, the furnace lid 4 and the electrode device 5 are attached to the prepared furnace body 3a, and melting is started.

In this way, the furnace lids 4 are placed alternately on the two furnace bodies 3 and 3a.
By installing the electrode device 5, the operating cycle time is shortened.

[Problem that the invention attempts to solve]

In such a multiple arc furnace 1, although the operation cycle time can be shortened compared to a single furnace, the furnace lid 4
Since the electrode device 5 cannot be tilted, the furnace lid 4 must be left open when the furnace bodies 3, 3a are tilted for slag removal or tapping.

As a result, the temperature of the molten steel decreases, causing heat loss and causing dust generation, causing environmental deterioration.

Therefore, it is desired to develop a multiple arc furnace that can conduct electricity while tilting within a certain tilting range, usually within a range of ±10 degrees, like a single furnace.

This invention was made in view of such a demand, and is an attempt to provide a multiple arc furnace that can be energized even in a tilted state with a simple mechanism.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention is based on the idea that two furnace bodies are installed adjacent to each other on a tilting floor that can be tilted for slag removal and tapping, and one set of furnace bodies is moved over these two furnace bodies. The furnace cover and the electrode device are attached to a rotating floor that is rotatably supported via an insertable and removable rotating center support mechanism, and the rotating floor and one of the tilting floors from which this rotating center support mechanism is removed. The present invention is characterized by providing a tilting connection mechanism that integrally connects and tilts.

[Effect]

The two furnace bodies of a double arc furnace are each attached to a tilting bed so that they can be tilted to perform slag removal and tapping, and the rotary bed, on which the furnace cover and electrode device are attached, is mounted on each furnace body. A swing center support mechanism is inserted only when turning so that the swing bed can be rotated, and a tilting connection mechanism that connects the swing bed and the swing bed together allows the swing bed from which the swing center support mechanism is removed to be tilted. It also allows for tilting when the power is on.

〔Example〕

Embodiments of this invention will be described in detail below based on the drawings.

Figures 1 and 2 are a plan view of an embodiment of the multiple arc furnace of this invention, and -
It is an arrow sectional view.

The double arc furnace 10 includes two furnace bodies 11, 11a, and tap ports 12, 12a and tap ports 13, 13a are provided at the front and rear of each furnace body 11, 11a.
The furnace body 1 is placed on tilting floors 14, 14a which are installed so as to be able to tilt toward the tapping ports 12, 12a or the slag ports 13, 13a.
1, 11a is installed.

On the other hand, a rotating floor 15 whose rotating center is at a point equidistant from the center of these two furnace bodies 11, 11a is provided adjacent to the tilting floors 14, 14a, and its rotating center O is a rotating center support mechanism 16. Supported.

As shown in FIG.
The rotation support shaft 18 inserted into and removed from the fluid pressure cylinder 1
9, and is inserted into the support portion 17 only when the revolving bed 15 rotates.

In addition, in order to make the rotation of the rotation floor 15 smooth, two arc-shaped rotation rails 20 centered on the rotation center O are divided into two tilting floors 14 and 14a and attached to the lower surface of the rotation floor 15. Swivel rail 20
A turning wheel 21 that rolls on the top is attached,
It is designed to be driven to swing by a swing drive device (not shown).

Furthermore, between each tilting floor 14, 14a and the rotating floor 15, there is a space between the rotating floor 15 and the rotating floor 15 to restrict the pivoting, and with the pivoting support shaft 18 of the pivoting center support mechanism 16 being pulled out from the support part 17. tilting floor 1
4 and 14a are integrally connected and tilted,
A plurality of lock pins 22 (two in the illustrated example) arranged horizontally on the lower surface of the rotating bed 15 are attached integrally with the rods of the hydraulic cylinder 23, and horizontal holes are formed in each of the tilting beds 14, 14a. Lock pin receivers 24, 24a are attached.

Swivel floor 1 that allows you to select between rotation and tilting in this way
Furnace lid support arms 25 are attached to both sides of the furnace lid 5, and the furnace lid 26 can be raised and lowered by a lifting device (not shown). Furthermore, the furnace lid support arm 2
Between 5 and 5, an electrode lifting device 27 moves three electrodes 28
The electrode 28 is connected to a transformer 31 of an electric structure 30 via a secondary conductor 29.

Melting work using the multiple arc furnace 10 configured as described above is performed by first lifting the furnace lid 26 with the lifting device of the furnace lid support arm 25 provided on the revolving floor 15, and lifting the electrode with the electrode lifting device 27. 28 is raised, and the pivot support shaft 18 of the pivot center support mechanism 16 is inserted into the support portion 17 of the pivot bed 15.

Then, each tilting floor 14, 14a to which the furnace body 11, 11a is attached is placed in a horizontal state, and the swing rail 2
0 is continuous, and the tilting floors 14, 14
The lock pin 22 connecting the rotating bed 15 and the rotating bed 15 is not fitted into any of the lock pin receivers 24, 24a.

After that, the furnace lid 26 and electrode 28 together with the rotating bed 15 are rotated and moved from above the furnace body 11, and
Steelmaking raw materials such as scrap are put into the furnace, and the rotating bed 15 is rotated in the opposite direction again to position the furnace cover 26 and the electrode 28 on the furnace body 11. The lock pin 22 is inserted to connect the rotating bed 15 and the tilting bed 14 together, and the swing support shaft 18 of the swing center support mechanism 16 is removed.

In this way, after the preparation for melting in the furnace body 11 is completed, the electrode 28 is energized to start melting, and steelmaking raw materials such as scrap are put into the other furnace body 11a in preparation for the next melting. put.

As the melting progresses, slag is removed.
Tilt everything. Then, the rotating bed 15 also locks the lock pin 2.
2 and the lock pin receiver 24, the rotating bed 15 can also be tilted, and the furnace lid 26 and electrode 28 can also be tilted, so that sludge can be removed while the electrode 28 is energized.

In addition, when the unmolten scrap is soaked in hot water to melt it, it is tilted toward the tapping side or the slag removal side, or when it is tilted slightly toward the tapping side to prevent molten steel from spilling from the slag removal port when the hot water level rises. Even when tilting is required for operational reasons, it can be tilted while energized.

When tapping in the furnace body 11 is completed in this way, the tilting bed 14 is brought into a horizontal state, the swing support shaft 18 is inserted into the support part 17 of the swing bed 15, and the lock pin 22 is removed from the lock pin receiver 24, so that the swing bed 15 is placed in a horizontal state. Make it possible to turn.

Then, the furnace lid 26 and electrode 28 attached to the furnace body 11 are raised and retracted by the lifting device on the furnace lid support arm 25 and the electrode lifting device 27, respectively.

After this, the rotating floor 1 is moved by a rotating drive device (not shown).
5 is turned around the turning center support shaft 18 as the turning center.

Then, the rotating floor 15 rotates smoothly as the wheels 21 roll along the rotating rail 20 on the tilting floor 14 and the rotating rail 20 on the tilting floor 14a.
The furnace lid 26 and electrode 28 are placed on the other furnace body 11a.

Then, when the rotating floor 1 is at the specified position,
The lock pin 22 of No. 5 is fitted into the lock pin receiver 24a of the tilting floor 14a, and the swing support shaft 18 is pulled out from the support portion 17 of the swing bed 15.

Thereafter, a furnace lid 26 and an electrode 28 are attached, and melting, slag removal, and tapping are performed in the same manner as in the case of the furnace body 11. In parallel with this, the furnace body 11 for which tapping has been completed is subjected to the next preparation for melting.

In this way, the two furnace bodies 11, 11a are alternately rotated around the rotating bed 15, the furnace cover 26 and the electrode 28 are attached, and melting is performed.

In such a double arc furnace 10, melting can be performed alternately by rotating a set of furnace lids 26 and electrodes 28 on the two furnace bodies 11 and 11a, and one furnace body 1
Since the other furnace body 11a can be prepared for melting during melting in step 1, the operation cycle time can be shortened.

In addition, since the revolving floor 15 can be tilted as well as rotated, the furnace lid 26 can
There is no need to remove the electrode 28, so there is no time loss, heat loss is reduced, and dust generation can be reduced, resulting in energy savings and environmental improvement.

Furthermore, if tilting is required during melting or scouring due to operational reasons, the tilting can be done while energizing, which prevents cooling of the molten steel, saves energy, enhances the scouring effect, and improves product quality. In addition to measuring, heating during tilting also improves productivity.

Next, another embodiment of this invention shown in FIG. 3 will be described.

In this embodiment, the configuration of the tilting connection mechanism between the tilting floors 14, 14a and the rotating floor 15 is changed, and the configuration of other parts is the same as that shown in FIG. 2.

The swing rail 20' attached to the tilting floor 14, 14a has an H-shaped steel cross section, and the swing rail 20' is attached to the tilting floor 15.
A set of two wheels 21' attached to the swivel rail 20' are fitted on the turning rail 20' so that the wheels 21' are adapted to roll while being restricted in the vertical direction. This turning rail 2
0' is laid in a concentric circular arc shape centered on the turning center O, similar to that shown in FIG.

Therefore, these swing rails 20' and wheels 2
1', the tilting floor 14, 14a and the rotating floor 15
Vertical movement between the two is restricted.

Therefore, in order to restrict and connect the other two directions, that is, the front and back and left and right directions, a lock pin 22' that is inserted and removed in the vertical direction is attached to the revolving bed 15 and is driven by a hydraulic cylinder 23'. floor 1
A cylindrical lock pin receiver 24' is attached in the vertical direction to each of the lock pins 4 and 14a, and by inserting the lock pin 22' into the lock pin receiver 24', the movement in the front and rear and left and right directions is restricted.

Note that other identical components are given the same numbers and explanations will be omitted.

Even if a tilting connection mechanism is configured with such a swing rail 20', wheels 21', lock pin 22', and lock pin receiver 24', it is not possible to make the swing floor 15 swingable or to connect it integrally with the tilt floors 14, 14a. Therefore, the same effects as those of the above-mentioned embodiments are achieved.

Note that in each of the above embodiments, explanations of the swing drive device and the tilt drive device of the swing bed have been omitted, but various mechanisms may be used, such as one using a fluid pressure cylinder or one that combines an electric motor or the like with a gear mechanism. I can do it.

Similarly, the drive mechanisms for the swing support shaft and lock pin are not limited to those shown in the drawings.

[Effect of idea]

As explained above in detail with the embodiments, according to this invention, two furnace bodies of a multiple arc furnace are attached to a tilting floor, and a rotating floor on which a set of furnace lid and electrode device are attached can be inserted and removed. A pivoting center support mechanism enables pivoting movement, and a tilting connection mechanism is provided that connects the tilting floor and the pivoting floor and tilts them together, making it possible to tilt the tilting floor at the same time as each furnace body is tilted. It is now possible to tilt the
Compared to retracting the furnace lid and electrodes every time they are tilted, the number of man-hours required is reduced, the operation cycle can be completed in a shorter time, and productivity is improved.

Furthermore, since the furnace lid and electrodes are not retracted every time the furnace lid is tilted, there is no time or heat loss due to opening the furnace lid, and less dust is generated, resulting in energy savings and environmental improvements.

Furthermore, the structure is simple and can be manufactured at low cost, and it can also be easily applied to existing multiple arcs.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the multiple arc furnace of this invention; Figure 1 is a plan view, Figure 2 is a sectional view taken along the - arrow in Figure 1, and Figure 3 is a cross-sectional view of this invention. A sectional view corresponding to FIG. 2 according to another embodiment, No. 4
The figure is a plan view of a conventional multiple arc furnace. 10... Multiple arc furnace, 11, 11a... Furnace body, 14, 14a... Tilting bed, 15... Rotating floor,
16... Turning center support mechanism, 18... Turning support shaft, 20... Turning rail, 21... Wheel, 22...
...Lock pin, 24...Lock pin receiver, 25...
Furnace cover support arm, 26...furnace cover, 27...electrode lifting device, 28...electrode, O...rotation center.

Claims (1)

[Scope of utility model registration request] Two furnace bodies are installed adjacent to each other on a tilting floor that can be tilted for slag removal and tapping, and a set of furnace lids and electrode devices that are moved onto these two furnace bodies can be inserted and removed. A tilting device that is attached to a rotating floor that is rotatably supported via a rotating center support mechanism, and integrally connects and tilts the rotating floor from which the rotating center support mechanism is removed and one of the tilting floors. A multiple arc furnace characterized by being equipped with a coupling mechanism.