JPH10237532A - Oxygen blowing device for electric furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxygen blowing device for an electric furnace capable of individually regulating the oxygen blowing angel and the oxygen blowing height from a lance relative to the molten metal level. SOLUTION: A lance 6 for blowing oxygen which is projected from a working hole 2b provided on a circumferential wall 2a of an electric furnace 2 is tiltable in the vertical direction so that oxygen blowing angle θ and the oxygen blowing height H relative to the molten metal level 2c are changed and regulated by the tilting operation. In addition, the lance 6 is freely operable in the parallel movement, and only the oxygen blowing height H is changed and regulated by the parallel movement without changing the oxygen blowing angel θ.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen blowing apparatus for an electric furnace, which is used to blow oxygen into the electric furnace when melting unmelted scrap or refining steel by the electric furnace.

[0002]

2. Description of the Related Art In a conventional oxygen blowing apparatus for an electric furnace of this type, generally, as shown in FIG. 16, an oxygen blowing lance 6 is provided in an electric furnace 2 through a working port 2b provided on a peripheral wall 2a thereof. It is configured so that the oxygen G can be ejected from the tip 6a at the tip of the lance toward the molten metal surface 2c. By the way, when oxygen G is ejected from the lance 6,
If the oxygen jetting angle θ and the oxygen jetting height H from the lance 6 with respect to c are not appropriate, a large amount of molten metal is scattered or the metallurgical properties are reduced, and good refining or the like cannot be performed. on the other hand,
The appropriate oxygen ejection angle θ and the oxygen ejection height H are different depending on the oxygen injection conditions (metallurgical conditions, oxygen ejection amount, etc.) and are different.

Therefore, in a conventional oxygen blowing apparatus for an electric furnace (hereinafter referred to as a "conventional apparatus"), the oxygen blowing lance 6 is tilted up and down as illustrated by a solid line or a chain line in FIG. The jetting angle θ and the oxygen jetting height H are devised so that they can be changed and adjusted according to the oxygen blowing conditions. That is, by tilting the lance 6 upward, the oxygen ejection angle θ can be reduced and the oxygen ejection height H can be increased. Conversely, by tilting the lance 6 downward, the oxygen ejection angle θ can be reduced. The oxygen jetting height H can be made large and small.

[0004]

However, by such a tilting operation of the lance 6, the oxygen jetting angle θ and the oxygen jetting height H are always changed in a constant inverse proportional relationship. It is not possible to make adjustments such as making the ejection angle θ and the oxygen ejection height H smaller or conversely larger, or changing only one of both θ and H. Therefore, depending on the oxygen blowing conditions, it is not possible to set both the oxygen jetting angle θ and the oxygen jetting height H to appropriate values, and the yield is deteriorated due to scattering of molten metal and deterioration of metallurgical properties. Was likely to occur.

In view of the above, the present invention can independently change and adjust the oxygen jetting angle and the oxygen jetting height in accordance with the oxygen blowing conditions, so that refining and the like can be performed satisfactorily. An object of the present invention is to provide an oxygen injection device for an electric furnace.

[0006]

According to the present invention, an oxygen blowing lance, which is inserted into an electric furnace through a working port provided on a peripheral wall thereof, can be tilted up and down freely. In the oxygen blowing device for an electric furnace configured to be able to change and adjust the ejection angle and the oxygen ejection height, in order to achieve the above object, in particular, the lance is freely movable up and down by a lance elevating mechanism, The present invention proposes a configuration in which the oxygen ejection height can be changed and adjusted without changing the oxygen ejection angle by the parallel movement operation.

[0007] According to this configuration, the oxygen ejection angle and the oxygen ejection height can be independently changed and adjusted independently by tilting and translating the oxygen injection lance up and down. For example, if the lance is tilted to set the oxygen ejection angle appropriately and then the lance is moved in parallel, only the oxygen ejection height can be adjusted with the oxygen ejection angle properly maintained. . Therefore, unlike the conventional device in which the oxygen ejection angle and the oxygen ejection height can only be adjusted in a certain inverse proportional relationship, the optimum oxygen ejection angle and oxygen The ejection height can be secured.

[0008]

FIG. 1 is a block diagram showing an embodiment of the present invention.
7 and FIGS. 8 to 15 will be specifically described.

FIGS. 1 to 7 show a first embodiment. An oxygen blowing apparatus 1 for an electric furnace according to the present invention according to the present invention, as shown in FIGS. A swing arm 4 installed on a work floor 3 provided outside and supported horizontally and freely swingable on the work floor 3, an arm swing operation mechanism 5 for horizontally swinging the swing arm 4, and a swing arm 4 An appropriate number (two in this example) of oxygen lances 6, which are connected so as to be able to move up and down, rotate horizontally and swing up and down freely,
6, a lance opening / closing operation mechanism 7 for moving the oxygen blowing lances 6, 6 into and out of the electric furnace 2 in conjunction with the horizontal rotation of the swivel arm 4, and a lance tilting for tilting the oxygen blowing lances 6, 6 up and down. An operating mechanism 8 and a lance lifting / lowering operating mechanism 9 for moving up and down in parallel are provided.

As shown in FIG. 3, the swivel arm 4 has a base end supported by a swivel table 11 installed on the work floor 3 so as to be horizontally rotatable, and has a predetermined length outside the electric furnace 2. Horizontal turning is possible between a work position (solid line position in FIG. 1 and a dashed line position in FIG. 2) and a standby position (solid line position in FIG. 2).

The arm turning operation mechanism 5 is provided on the turning arm 4 as shown in FIGS.
Traveling wheels 12 rolling on the work floor 3 in order to horizontally turn
And a traveling-wheel drive mechanism for driving this forward and reverse.
The running wheel 12 is made of metal, and a horizontal shaft 1 orthogonal to the longitudinal direction of the turning arm 4 is provided on the lower surface of the tip of the turning arm 4.
The pivot arm 3 is rotatably supported on the work floor 3 so as to be horizontally rotatable. That is, the swing arm 4 is horizontally supported on the work floor 3 via the swivel 11 and the traveling wheels 12 at both ends (a base end and a distal end). Further, the traveling wheel drive mechanism may be any mechanism that drives the traveling wheel 12 in the normal and reverse directions, and the configuration thereof is arbitrary. In this example, the traveling wheel drive mechanism is attached to the distal end of the turning arm 4 via the bracket 14. A reverse rotation motor, for example, a geared motor 15, and a rotational force transmitting means 16 comprising a sprocket wheel and a roller chain for interlockingly connecting an output shaft thereof and a horizontal shaft 13 as a running wheel shaft;
It consists of Thus, this arm turning operation mechanism 5
According to the above, the traveling arm 12 is driven forward and reverse by the geared motor 15 to roll and travel on the work floor 3, so that the turning arm 4 is horizontally supported on the work floor 3 at both ends. It can be turned horizontally between the working position and the standby position. By the way, according to such an arm turning drive mechanism 5, the turning drive of the turning arm 4 is performed by rolling the running wheel 12 provided at the tip of the arm farthest from the turning center on the work floor 3. As a result, the driving force required to turn the turning arm 4 is as small as possible, as compared with a general arm turning drive mechanism in which the turning center portion is incorporated into the turning table 11 to drive the turning center. The geared motor 15 as a driving source can be made as small as possible.
Moreover, since the arm turning drive mechanism 5 is composed of the running wheels 12 and the running wheel drive mechanisms 15 and 16 mounted on the outer surface of the turning arm 4, the arm turning drive mechanism 5 has a larger size than the general arm turning drive mechanism described above. The configuration becomes extremely simple.
Therefore, the entire apparatus 1 including the swing arm 4 and the swing drive mechanism 5 can be greatly simplified and downsized, and the stable swing of the swing arm 4 allows the oxygen lances 6, 6 to enter and exit. It can be done smoothly.

The two lances 6 and 6 for blowing oxygen are shown in FIGS.
As shown in FIG. 7, together with the powder blowing lance 17, it is integrally connected in parallel at the base end by a lance mounting body 18, and via a lifting body 19, a rotating body 20, and a tilting table 21, the turning arm 4 is connected. Can be moved up and down at the tip of
It is connected to swing up and down. That is, an elevating body 19 is vertically movably engaged with and connected to the distal end of the revolving arm 4. A rotating body 20 is pivotally supported by the elevating body 19 so as to be horizontally rotatable. A tilting table 21 is pivotally supported 21a so as to be able to swing up and down. The bases of the lances 6, 6, 17 are mounted on the tilting table 21 via a lance mounting body 18. The connection mechanism between the turning arm 4 and the lifting / lowering body 19 may be any as long as it can connect the lifting / lowering body 19 to the turning arm 4 so as to be vertically movable within a certain range.
In this example, the opposing end faces of the two 4 and 19 are formed in a dovetail structure so that the two are connected so as to be relatively slidable in the vertical direction. That is, as shown in FIG.
A pair of guide bodies 4 a having a trapezoidal cross section are provided on the side of the swing arm 4.
4a, and each guide body 4a
A pair of upper and lower dovetails 1 that are slidably engaged with the upper and lower
9a and 19a are protruded. In addition, each lance 6,17
Although the shape and the configuration are arbitrary, in this example, Japanese Patent Application No.
No. 14168, Japanese Patent Application No. 7-14169, Japanese Patent Application No. 7-1
No. 4,170, each lance 6 for oxygen injection.
Is configured as a water-cooled type having a shape in which a front end portion is bent upward. A lance tip 6a for ejecting oxygen G obliquely downward is provided at the tip end of each oxygen blowing lance 6. This lance tip 6a
Is also configured with the structure disclosed in the above-mentioned Japanese Patent Application No. 7-14168.

As shown in FIGS. 1 to 6, the lance moving mechanism 7 includes a rotating body 19 for connecting the base ends of the lances 6, 6, and 17 to the rotating arm 4 so as to be horizontally rotatable. 1
1. Position adjustment lever 2 supported in a horizontal swingable position
2, a hydraulic cylinder 23 interposed between one end of the position adjusting lever 22 and an appropriate position of the swivel table 11, and a swivel arm 4
A vertical support shaft 24 rotatably supported at a substantially central portion of the vertical support shafts, and upper and lower links 25, 2 fixed to upper and lower ends of the vertical support shaft 24.
6, a lower connecting link 27 connecting the free end of the lower link 26 and the other end of the position adjusting lever 22, and an upper link 25.
Connection link 28 connecting the free end of the shaft and the rotating body 20
Consists of Thus, according to the lance in / out operation mechanism 7,
When the turning arm 4 is horizontally turned between the working position and the standby position while the position adjusting lever 22 is held at the intermediate swinging position (the solid line position in FIG. 1 and the solid line position in FIG. 2) by the hydraulic cylinder 23, The lances 6, 6, and 17 are relatively horizontally rotated about the pivot point 20a of the rotating body 19 by the link mechanisms 25 to 28, and the lances 6, 6, and 17 are moved from the working port 2b formed in the peripheral wall 2a of the electric furnace 2 to the inside of the electric furnace 2. The operation is performed between a blowing action position (solid line position in FIG. 1 and a dash-dot line position in FIG. 2) projecting out of the electric furnace 2 and a storage position (solid line position in FIG. That is, the traveling wheels 12 are driven to rotate forward and the turning arm 4 is turned from the working position to the standby position, so that the lances 6, 6, 17 are rotated and displaced in a direction in which the lances 6, 6, 17 are folded. While retracting out of the electric furnace 2 through the work port 2b, the electric furnace 2 is stored in a predetermined storage position that does not interfere with operations other than the blowing operation (such as tapping operation). In addition, the traveling wheels 12 are driven to rotate in the reverse direction, and the turning arm 4 is turned from the standby position to the working position, so that the lances 6, 6, 17 are rotationally displaced relative to the turning arm 4 in the opposite direction. While entering the electric furnace 2 from the working port 2b, the electric furnace 2 is located at a blowing operation position suitable for blowing oxygen or powder. Further, by displacing the position adjusting lever 22 from the intermediate swing position by the hydraulic cylinder 23,
For example, as shown by a chain line in FIG. 1 or a two-dot chain line in FIG. 2, the lances 6, 6, 17 can be displaced in the horizontal direction, so that the blowing action position or the storage position can be adjusted within a certain range. ing. The connecting portion at both ends of the link 28 is formed of a universal joint in order to cope with a relative vertical displacement by the lance lifting / lowering operation mechanism 9 between the swing arm 4 and the lances 6, 6, 17 described later.

As shown in FIGS. 5 and 6, the lance tilting operation mechanism 8 connects the base ends of the lances 6, 6, 17 to the pivot arm 4.
Tilting table 21 for vertically connecting to a swinging unit, a swinging lever 31 supported vertically by a rotating body 20 that pivotally supports 21a, and one end of the swinging lever 31 And a hydraulic cylinder 33 interposed between the other end of the swing lever 31 and the rotating body 20, and the lances 6, 6, 17 are provided with hydraulic pressure. By extending and contracting the cylinder 33, the cylinder 33 can be vertically displaced about the pivot point 21 a of the tilting table 21. That is, lance 6,6
With the hydraulic cylinder 3 held in the blowing position.
3 can be vertically displaced by expanding and contracting, so that the oxygen ejection angle θ and the oxygen ejection height H from each lance tip 6a with respect to the molten metal surface 2c can be changed and adjusted in a certain inverse proportional relationship. (See the solid line in FIG. 5 and the dashed line).

As shown in FIGS. 3 and 4, the lance lifting / lowering operating mechanism 9 includes a lifting / lowering body 19 for connecting the lances 6 and 6 to the swing arm 4 so as to be vertically movable, and a swingable vertical movement to the swing arm 4. A supported operating lever 35, a connecting link 36 connecting one end of the operating lever 35 to the elevating body 20, a hydraulic cylinder 37 interposed between the other end of the operating lever 35 and the turning arm 4. When the hydraulic cylinder 37 is expanded and contracted, the elevating body 19 is moved up and down relative to the revolving arm 4 so that the lances 6 and 6 can be moved in parallel in the vertical direction. That is, the lances 6, 6 can be moved up and down by moving the hydraulic cylinder 37 in a state where the lances 6 and 6 are held at the blowing position, so that the lances 6 and 6 can be moved in parallel up and down without changing the oxygen ejection angle θ and the oxygen ejection height H Can be adjusted only (Fig. 5, solid line,
One-dot chain line, see FIG. 6).

FIGS. 8 to 15 show a second embodiment. An oxygen blowing apparatus 101 for an electric furnace according to the present invention in this embodiment is, as shown in FIGS. A swing arm 104 installed on a work floor 3 provided outside the furnace 2 and supported on the work floor 3 so as to be horizontally swingable; an arm swing operation mechanism 105 for horizontally swinging the swing arm 104; A suitable number (two in this example) of oxygen lances 6,6 and powder lances 17, and lances 6,6, which are connected to 104 in a vertically movable, horizontally rotatable, and vertically swayable manner. A lance in / out operation mechanism 107 for operating the electric furnace 2 in and out in cooperation with the horizontal rotation of the arm 104, a lance tilting operation mechanism 108 for vertically moving the lances 6, 6 and a lance elevating operation mechanism 109 for moving the lances 6 and 6 in parallel. Comprising a.

As shown in FIG. 10, the swing arm 104
It is a long one whose base end is rotatably supported on a swivel table 111 installed on the work floor 3 and has a predetermined work position (position in FIG. 8) and a standby position (solid line in FIG. 9) outside the electric furnace 2. Position).

The arm turning operation mechanism 105 is shown in FIGS.
As shown in FIG. 3, a gear driving means provided on the swivel base 111 and a pair of running wheels 112 provided on the swivel arm 104,
112. The gear driving means includes, as shown in FIGS. 8 to 10, a large-diameter driven gear 41 provided at the base end of the turning arm 104 concentrically with the center of rotation thereof, and a turning table 111.
Small driving gear 4 which is provided at the
2 and a driving device (not shown) for driving the driving gear 42 in the normal and reverse directions. By driving the driving gear 42 in the normal and reverse directions, the turning arm 104 is horizontally turned between the working position and the standby position. It is constituted so that it can be performed.
The running wheels 112, 112 are made of metal,
The rotating arm 104 is mounted on the working floor 3 with the horizontal swing of the swing arm 104. That is, as shown in FIGS. 8 to 13, the traveling wheel support means includes a pair of support legs 43, 43 suspended from the turning arm 104, and a slider supported by each support leg 43 so as to be vertically slidable within a certain range. 44
A spring 45 provided on each support leg 43 to urge the slider 44 downward, and running wheels 112 and 11 at both ends.
2 is rotatably supported, and the middle portion is
The traveling wheel case 46 is pivotally supported by the support wheels 4 and 44, and supports the traveling wheels 112 and 112 via the springs 45 and 45 so that the traveling wheels 112 and 112 can move up and down. Therefore, as in the device 1 described above, the swing arm 104 is horizontally supported on the work floor 3 via the swivel table 1111 and the running wheels 112 at both end portions (the base end portion and the distal end portion). Moreover, running wheel 1
Even when the working floor on which the wheels 12 and 112 run have irregularities, the running wheels 112 and 112 swing or move up and down following them, so that the turning arm 104 is turned in a constant horizontal posture. Thus, the stable movement of the swing arm 104 allows the oxygen lances 6, 6 to smoothly move in and out.

Each of the lances 6 and 17 has the same structure as the lance in the above-mentioned apparatus 1, and as shown in FIGS. 10 to 13, a swing arm 104 via an elevating body 119, a rotating body 120 and a tilting table 121. Are connected to the tip of the robot so as to be vertically movable, horizontally rotatable, and vertically swingable. That is, a pivot 120 is pivotally supported at the tip of the pivot arm 104 so as to be horizontally rotatable.
9 is supported so as to be able to move up and down, and a tilting table 121 is pivotally supported by an elevating body 119 so as to be able to swing up and down. The tilting table 121 has base ends of the lances 6, 6 and 17 attached to the lance. It is attached via 118,118.

The lance moving mechanism 107 is shown in FIGS.
As shown in FIG. 5, the base of the lances 6, 6, 17
19 and a rotating body 120 supported by the rotating arm 104 so as to be horizontally rotatable via the tilting table 121, and a telescopic operating rod 47 stretched between the rotating table 111 and the rotating body 120.
And a telescopic operating means (not shown) such as a hydraulic cylinder for operating the operating rod 47 to extend and retract, and by operating the operating rod 47 in accordance with the turning position of the turning arm 104,
The lances 6, 6, and 17 are relatively horizontally rotated about a pivot point 120a of the rotating body 120 so that the peripheral wall 2 of the electric furnace 2 is rotated.
The operation is performed between a blowing action position (position shown in FIG. 8) protruding into the electric furnace 2 from a working port 2b formed in the electric furnace 2 and a storage position (position shown in FIG. 9) which is retracted and stored outside the electric furnace 2. Have been. That is, when the driving gear 42 is driven to rotate forward and the turning arm 104 is turned from the working position (the position in FIG. 8) to the standby position (FIG. 9), and the operating rod 47 is sequentially extended, the lance 6, 6, 17 are swivel arms 1
While being rotated and displaced in a direction to be folded with respect to the electric furnace 04, the electric outlet 2b is withdrawn out of the electric furnace 2 and stored in a predetermined storage position which does not hinder operations other than the blowing operation (such as tapping operation). It has become. When the driving gear 42 is driven to rotate in the reverse direction to turn the turning arm 104 from the standby position to the working position, and the operating rod 47 is sequentially reduced, the lances 6, 6, 17 move with respect to the turning arm 104. While rotating and displacing in the opposite direction to the above, the electric furnace 2
And into a blowing position suitable for blowing oxygen or powder. Also,
The lances 6, 6, and 17 can be swingably displaced in the horizontal direction by extending and retracting the operating rod 47 with the turning arm 104 in the working position. The dashed lines and the dashed lines in FIG. The blowing position can be adjusted arbitrarily in the range. Similarly, the lances 6, 6, and 17 can be swung horizontally by extending and retracting the operating rod 47 with the turning arm 104 at the standby position, and the storage position can be adjusted within a certain range. It is possible to do it.

As shown in FIGS. 11 and 12, the lance tilting operation mechanism 108 includes a tilting table 121 to which the base ends of the lances 6, 6, and 17 are attached, and the pivoting base 121 which can swing vertically.
Elastic member 4 interposed between rotating body 120 and 21a
8, and by expanding and contracting the elastic member 48,
The lances 6, 6, and 17 are configured to be able to swing up and down around a pivot point 121 a of the tilting table 121. That is, the lances 6, 6 can be vertically displaced by the expansion and contraction operation of the expansion and contraction member 48 while holding the lances 6 and 6 at the blowing position, and the oxygen ejection angle θ from the lance to the molten metal surface 2c and the oxygen The ejection height H can be changed and adjusted with a constant inverse proportional relationship (see the solid line and the dashed line in FIG. 11). The elastic member 48
, Regardless of whether it is due to artificial manipulation,
Any structure can be used as long as it can be extended and contracted so as to swing the tilting table 121 up and down and can be held at an arbitrary swinging position. For example, it can be constituted by a screw structure or a hydraulic cylinder.

As shown in FIGS. 10 to 15, the lance lifting / lowering operation mechanism 109 includes lifting / lowering support means for supporting the lifting / lowering body 119 on the rotating body 120 so as to be movable up and down, and lifting / lowering operation interposed between the two bodies 119 and 120. Means. The lifting support means,
A pair of legs 49, 49 suspended from the elevating body 119 while being positioned on both sides of the rotating body 120, and a pair of engagement projections 50, 50 projecting from the legs 49 and extending in the vertical direction. ,
The engaging projection 5 of each leg 49 is attached to the rotating body 120.
12 and a pair of U-shaped guides 51 and 51 for engaging and holding the upper and lower members 0 and 50 slidably up and down.
(Position) and the highest position (position shown in FIG. 13) separated from the upper surface of the rotating body 120 by a predetermined amount upward. The lifting / lowering operation means pivotally supports 53b the brackets 52, 52 attached to the lower surface of the rotating body 120 at the intermediate portion of the cylinder portion 53a, and pivotally connects the tip of the rod portion 53c to the lifting / lowering body 119.
The lifting / lowering body 119 can be moved up and down between the lowest position and the highest position by extending and contracting the hydraulic cylinder 53, and can be arbitrarily held at the raising / lowering position. It has become. Therefore, according to the lance lifting / lowering operation mechanism 109, the lances 6 and 6 are extended and retracted by operating the hydraulic cylinder 53 in a state where the lances 6 and 6 are held at the blowing position, so that, for example, the position indicated by the solid line in FIG. It can be moved up and down between the positions shown in the figure, and only the oxygen ejection height H can be adjusted without changing the oxygen ejection angle θ.

According to the oxygen blowing devices 1 and 101 for the electric furnace configured as described above, the oxygen blowing lances 6 and 6 are provided.
Is brought to the blowing action position by the arm turning drive mechanisms 5, 105 and the lance in / out operation mechanisms 7, 107, and is tilted by the lance tilting operation mechanisms 8, 108, and is vertically translated by the lance elevating operation mechanisms 9, 109. By the operation, the oxygen blowing angle θ and the oxygen blowing height H can be adjusted to the optimum values according to the blowing conditions. That is, first, the oxygen blowing lances 6, 6 are tilted up and down by operating the hydraulic cylinder 33 or the telescopic member 48 to expand and contract as illustrated by the solid line and the dashed line in FIG. Adjust θ properly.
Next, the oxygen injection lances 6 and 6 are connected to the hydraulic cylinder 3.
By expanding and contracting 7, 53, as shown in FIG. 5 by a solid line and a two-dot chain line, in FIG. 6 by a solid line and a one-dot chain line, or in FIG. Move to adjust the oxygen blowing height H appropriately. Due to the lance parallel movement, the oxygen blowing angle θ does not change, and the value determined by the previous tilting operation is maintained. As described above, since the oxygen blowing angle θ and the oxygen blowing height H can be adjusted independently of each other, the oxygen blowing angle θ and the oxygen blowing height H can be adjusted optimally according to the blowing conditions, and the It is possible to satisfactorily blow oxygen G while effectively preventing a large amount of metal from scattering and a reduction in metallurgical properties. As a result, refining and the like can be favorably performed without incurring a decrease in yield. In addition,
There is no particular problem before and after the adjustment of the oxygen blowing angle by the lance tilting mechanisms 8 and 108 and the adjustment of the oxygen blowing height by the lance lifting / lowering operation mechanisms 9 and 109, and it goes without saying that either may be performed first.

It should be noted that the present invention is not limited to the above-described embodiments, and can be appropriately improved and changed without departing from the basic principle of the present invention. For example, each mechanism 5, 7, 8, 9 or 105, 107, 10
The configurations of the lance tilt operation mechanisms 8 and 108 and the lance elevation operation mechanisms 9 and 109 are particularly arbitrary.
Appropriately changed according to the configuration of the in / out operation means of the oxygen blowing lances 6, 6 (in the above example, the swing arm 4, 104, the arm swing drive mechanism 5, 105, and the lance in / out operation mechanism 7, 107). can do. Further, a traveling rail for the traveling wheels 12 and 112 may be provided on the work floor 3.

[0025]

As can be easily understood from the above description, according to the oxygen blowing apparatus for an electric furnace of the present invention, not only can the lance for blowing oxygen be tilted up and down, but also it can be translated vertically. Since it is made possible, the oxygen blowing angle and the oxygen blowing height can be independently adjusted.
Therefore, under any oxygen blowing conditions, the optimum oxygen blowing angle and oxygen blowing height can be ensured, and oxygen can be blown well without causing scattering of molten metal and deterioration of metallurgical properties. be able to.

[Brief description of the drawings]

FIG. 1 is a plan view of an oxygen blowing apparatus for an electric furnace according to a first embodiment of the present invention.

FIG. 2 is a plan view corresponding to FIG. 1, showing a state different from FIG. 1;

FIG. 3 is an arrow view along the line III-III in FIG. 1;

FIG. 4 is a side view corresponding to FIG. 3, showing a state different from FIG. 3;

FIG. 5 is a vertical sectional front view taken along the line VV of FIG. 1;

6 is a longitudinal sectional side view corresponding to FIG. 5, showing a state different from FIG. 5;

FIG. 7 is an enlarged detail view showing a main part of FIG. 1;

FIG. 8 is a plan view of an oxygen blowing apparatus for an electric furnace according to a second embodiment of the present invention.

FIG. 9 is a plan view corresponding to FIG. 8, showing a state different from FIG. 8;

FIG. 10 is a side view of the same device in the state shown in FIG.

FIG. 11 is a vertical sectional front view taken along the line XI-XI of FIG. 8;

FIG. 12 is a partially cutaway front view showing a main part of FIG. 11 in an enlarged manner.

FIG. 13 is a front view corresponding to FIG. 12, showing a state different from FIG. 12;

14 is a cross-sectional plan view taken along the line XVI-XVI of FIG.

FIG. 15 is a vertical sectional side view taken along line XV-XV in FIG. 12;

FIG. 16 is a longitudinal sectional side view corresponding to FIG. 5 showing a conventional device.

[Explanation of symbols]

1,101 ... oxygen blowing device for electric furnace, 2 ... electric furnace, 2a
... peripheral wall, 2b ... working port, 2c ... hot surface, 4,104 ... revolving arm, 5,105 ... arm revolving drive mechanism, 6 ... lance for oxygen blowing, 7, 107 ... lance in / out operation mechanism, 8, 1
08: Lance tilting operation mechanism, 9, 109: Lance lifting / lowering operation mechanism, 11, 111: Swivel table, θ: Oxygen blowing angle, G
... Oxygen, H ... Oxygen injection height.

Claims (1)

[Claims] 1. An oxygen injection lance protruding from a working port provided in a peripheral wall of an electric furnace can be tilted up and down freely, and by the tilting operation, the oxygen ejection angle and the oxygen ejection height of the lance with respect to the molten metal surface can be reduced. In the oxygen blowing apparatus for an electric furnace configured to be able to change and adjust, the lance can be freely moved up and down by a lance elevating mechanism so that the oxygen ejection height can be changed without changing the oxygen ejection angle by the parallel movement operation. An oxygen injection device for an electric furnace, wherein the oxygen injection device is configured to be able to change and adjust.