JP2000248308A - Device for removing foreign matter in steel tapping hole of electric furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the foreign matter stuck to the inner part at the steel tapping stage from a steel tapping hole in an eccentric furnace bottom steel tapping type electric furnace in a short time and to efficiently exchange a refractory for steel tapping hole. SOLUTION: A breaker rod 49 fitted to a breaker 45 provided for a steel tapping hole foreign matter removing device, is elevated/lowered with a plunger 40 in a hydraulic cylinder for extending/shrinking, where a slide frame 32 for supporting the breaker rod is arranged in the inner part of an outer frame 30. Further, the breaker rod 49 is made rockable in orthogonal two directions with two hydraulic cylinders 38 orthogonally arranged at the lower part of the outer frame 30 to safely and surely remove the foreign matter stuck to the inner part at the steel tapping stage from the steel tapping hole of the electric furnace for short time. Then, a steel tapping hole exchanging jig is fitted on a breaker case 44 so as to be attachable/detachable, and the exchange of the damaged refractory for steel tapping hole is efficiently executed by using the jig.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapping port foreign matter removing device for an electric furnace having a tapping port of an eccentric hearth tapping type.

[0002]

2. Description of the Related Art Generally, there is known an electric furnace for steelmaking in which iron scrap as a main raw material is melted and refined using an electric arc as a heat source. Electric furnaces include an AC electric furnace and a DC electric furnace, and a bottom-bottomed steel type is often used. In an AC electric furnace, three graphite electrodes are inserted into the furnace from above the furnace via a furnace lid, and an arc is generated between the electrodes mainly through scrap or molten steel. Also, as shown in FIG.
In the DC electric furnace 1, one graphite electrode 10 is inserted into the furnace from above the furnace via the furnace lid 3, and a DC arc is formed using the columnar iron electrode 11 embedded in the furnace bottom 4 as the other electrode. It is generated and melted and refined.

[0003] The furnace body 2 and the furnace lid 3 are formed of iron shell and refractory brick, and the spherical furnace bottom 4 is configured to roll on the upper surface of the base 17. The example of FIG. 20 shows an eccentric hearth tapping type, in which a tapping portion 5 is provided at an eccentric portion where a part of the hearth 4 is extended in the radial direction. Is provided. The DC electric furnace 1 can be tilted by a tilting hydraulic cylinder 9 provided in the furnace body 2. The tap hole 6 is provided with an opening / closing gate 7 which turns from below and closes the tapping port.
Is waiting, and the molten steel discharged from tap hole 6 is ladle 8
Received within.

The ladle 8 includes a bracket 16 formed at the lower end of a pair of ladle trunnions 15 provided on the upper sides of both sides.
It is supported by being mounted on a pair of ladle supports 14 provided on the movable carriage 13. After receiving the steel, the movable carriage 13 travels on the rail 12 via the wheels 20, and the ladle 8 is moved to the next step. It is transported to a continuous casting device. Reference numeral 25 denotes a leveling jig. By the way, the tapping hole 6 provided in the tapping part 5 of the DC electric furnace 1 is located at a position higher than the deepest part of the furnace bottom 2, and the tapping of the tapping port 6 is performed by closing the opening / closing gate 7. This is done by filling the steel mouth 6 with sand. Tapping from the DC electric furnace 1
After the opening and closing gate 7 is opened, sand is extracted from the tapping port 6 to start. During the tapping, the furnace body 2 is tilted using the tilting hydraulic cylinder 9 so that the molten steel comes to the tapping port 6 to prevent the slag floating on the molten steel from flowing out.

At the end of tapping, since the amount of molten steel in the furnace decreases, foreign matters such as solidified slag floating in the molten steel or slag, exfoliated refractories, or broken graphite electrodes clog the tapping port 6. In some cases, tapping cannot be performed. In this case, after the furnace body 2 is tilted to move molten steel from the top of the tapping port 6 to the furnace bottom 4 side, an operator inserts an iron pipe into the tapping port 6 from above the tapping port 6. Then, oxygen gas is supplied to dissolve and remove foreign matter by using the heat of oxidation of the iron pipe. However, when the refractory or graphite electrode is clogged in the tap hole 6,
It cannot be dissolved and opening is difficult. Normally, two DC electric furnaces 1 are installed, and they are operated alternately with a staggered operation cycle, but for removing foreign matter clogged in the tap hole 6.
If it takes more than 30 minutes, it will adversely affect the subsequent continuous casting operation. However, the removal of foreign matter using the conventional heat of oxidation often takes more than 30 minutes, and it has been desired to reduce the time.

[0006] As another means for removing foreign matter other than dissolving foreign matter, Japanese Utility Model Application Laid-Open No. 7-12892 discloses that a foreign matter removing jig is gradually lowered from above the tapping hole while being rotated. A device for removing a clogged foreign substance is disclosed. However, since the inside of the furnace is hot at the stage of tapping, the foreign matter removing jig is exposed to high temperature when the foreign matter removing jig is lowered from above the tapping port, and the foreign matter removing jig is melted. There is a problem that it is not possible and involves dangerous work in a high temperature environment.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art by using a vibration breaker for any foreign matter clogged in a tapping port. It is an object of the present invention to enable easy and safe removal from below a tap hole even during tapping. Furthermore, when the refractory material forming the tap hole is worn out, foreign matters such as metal and slag adhered to the tap hole and the vicinity thereof are removed, and the damaged tap hole forming the tap hole is advanced. It is an object of the present invention to provide a foreign matter removing device for an electric furnace tap hole which is suitable for securely and safely performing a task of removing a refractory material and a task of attaching a refractory block forming a new tap hole. is there.

[0008]

According to a first aspect of the present invention, there is provided an apparatus for removing foreign matter from a tapping hole of an electric furnace, wherein a breaker rod to which a breaker rod is detachably mounted is held. A breaker case, a support frame connected to the breaker case, a telescopic device for expanding and contracting the support frame, and a support frame rocking device for supporting and rocking the support frame. This is a device for removing foreign matter at the tap hole of an electric furnace.

According to a second aspect of the present invention, there is provided an apparatus for removing foreign matter at a tapping hole of an electric furnace, wherein a breaker case holding a breaker having a breaker rod detachably mounted upward and a support connected to the breaker case. An apparatus for removing foreign matter from a tapping hole of an electric furnace, comprising: a frame; a telescopic device for expanding and contracting the support frame; and a support frame rocking device for supporting and rocking the support frame together with the telescopic device. It is.

According to a third aspect of the present invention, there is provided an apparatus for removing foreign matter from a tapping hole of an electric furnace, comprising: a breaker case holding a breaker having a breaker rod detachably mounted upwardly; and a support connected to the breaker case. What is claimed is: 1. A tapping port foreign matter removing device for an electric furnace, comprising: a supporting frame swinging device that supports and swings a frame; and an elevating device that moves the supporting frame up and down together with the supporting frame swinging device. .

According to a fourth aspect of the present invention, the support frame includes a slide frame and an outer frame fitted to the outside of the slide frame, and the outer frame is swingably movable through a bearing and a trunnion. 3. The electric device according to claim 1, wherein the trunnion frame is supported on a device support base via a bearing and a trunnion so as to be swingable through a trunnion frame surrounding the upper side surface of the frame. 4. This is a device for removing foreign matter from the tap hole of a furnace.

According to a fifth aspect of the present invention, there is provided a guide rail which is disposed in parallel with each other in the length direction of each outer surface formed by the slide frame, and wherein the guide rail is disposed on the outer frame. 5. The apparatus according to claim 4, further comprising a guide roller for guiding the outer surface of the slide frame from four surfaces between guide rails disposed on the slide frame. .

According to a sixth aspect of the present invention, the oscillating device connected to each of two orthogonal side surfaces at the lower end of the outer frame and supported by the device support base is a cylinder. Item 6. An apparatus for removing foreign matter at a tapping hole of an electric furnace according to Item 4 or 5. According to a seventh aspect of the present invention, a cover for preventing collision of foreign matter is attached to an upper end of a breaker case in which the breaker is stored and set. An apparatus for removing foreign matter at a tapping hole of an electric furnace as described above.

According to an eighth aspect of the present invention, a jig for exchanging a tapping hole is detachably provided on an upper surface of a breaker case for storing and setting the breaker. 3. The apparatus for removing foreign matter at a tapping hole of an electric furnace according to 3, 4, 5, 6, or 7. According to a ninth aspect of the present invention, the apparatus support base is placed on the ladle support of the ladle moving carriage, and a positioning guide provided on the apparatus support base is provided near the ladle support base. The foreign matter removing device for a tapping hole of an electric furnace according to claim 1, wherein the foreign matter is fitted into the positioning post.

According to a tenth aspect of the present invention, in the first, second, third, fourth, fifth, sixth, seventh, or eighth aspect, the support frame for the apparatus is installed on a dedicated movable carriage. This is a device for removing foreign matter at a tap hole of an electric furnace.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the present invention, a movable carriage 13 for transporting the ladle 8 shown in FIG. 20, which has been conventionally used, is used. The case where the ladle 8 is removed from the support base 14 and the apparatus for removing foreign matter at the tapping hole of the electric furnace according to the present invention on the movable carriage 13 will be described.
It should be noted that the present invention is not limited to this, but it is possible to manufacture a dedicated movable trolley, on which a foreign matter removing device for an electric furnace tapping hole according to the present invention can be fixedly installed. Not even.

The present invention, as shown in FIGS.
A positioning post 18 is erected at one end of an existing ladle support 14 provided on the moving carriage 13, and a device support base 19 is placed on the ladle support 14. At this time, a pair of positioning guides having a vertical opening at the lower end of the support frame 19 for the device.
21 is fitted into the positioning post 18 erected on the ladle support 14 and set so as not to be displaced in the horizontal direction.

The support frame 19 for the apparatus has a lower floor 22, a middle floor 23 and an upper floor 24, and a rectangular trunnion frame 27 is provided on the middle floor 23 via trunnions 28 arranged on both side surfaces. Is rotatably supported. As shown in FIGS. 3 and 4, a square outer frame 30 is arranged inside the trunnion frame 27. The outer frame 30 is rotatably supported by a bearing bearing 29 provided on the other side surface of the trunnion frame 27 via a trunnion 31. Therefore, the pair of trunnions 28 and the pair of trunnions 31 have a configuration in which the respective axes swing so as to intersect in the trunnion frame 27, and in this drawing, the trunnions 28 and 31 are orthogonal to each other in the same plane of the trunnion frame 27. Arrangement.

A square slide frame 32 is slidably fitted into the outer frame 30 from above.
In the upper part, guide rollers 34 are provided on the four sides
They are arranged in columns. Although the outer frame 30 and the slide frame 32 are shown as squares, they may be slidable, and may have a circular or polygonal shape. Further, as shown in FIGS. 5 and 6, the guide roller 34 is disposed in the upper and lower openings 37 provided in the outer frame 30. As shown in FIGS. 7 and 8, a groove 35 is provided on an outer side surface of the slide frame 32 in a vertical direction, and a guide rail 36 is fitted into the groove 35.
It is fixed using embedded bolts. Guide roller 34
Guides the outer surface of the slide frame 32 between the two rails 36 through the two upper and lower openings 37, whereby the slide frame 32 is smoothly raised and lowered (see FIG. 3).

As shown in FIG. 9, two rocking hydraulic cylinders 38 as rocking devices are connected to the lower outer surface of the outer frame 30 so as to be orthogonal to each other in a horizontal direction. Each swing hydraulic cylinder 38 is supported by a bracket 39 taken out from the lower floor 22 so as to be able to turn horizontally via a vertical shaft 48. As shown in FIG. 10, the outer frame 30 and the slide frame
A telescopic hydraulic cylinder 33 is arranged as a telescopic device in the space defined by 32. The telescopic hydraulic cylinder 33 is supported upward on the inner bottom surface of the outer frame 30 via a bearing 42 and a pin 43,
Plunger that expands and contracts upward from hydraulic cylinder 33
The tip of 40 is connected to the ceiling surface of the slide frame 32 (corresponding to the lower surface of the breaker support member 41) via a bearing 42 and a pin 43. The plunger 40 of the telescopic hydraulic cylinder 33
Has a stroke necessary to remove foreign matter from the tapping opening 6.

Further, a hydraulic breaker 45 is fixedly disposed in a breaker case 44 provided on the breaker support member 41, and a breaker rod 49 is detachably mounted on the hydraulic breaker 45 in an upward direction. A cover 46 is attached to the upper part of the breaker case 44 to prevent foreign substances falling from above from hitting the device. Here, if the swing angle of the outer frame 30, the slide frame 32, and the breaker rod 45 provided with the trunnions 28, 31 provided at the trunnion frame 27 by the operation of the swing hydraulic cylinder 38 as a fulcrum is 5 ° at the maximum, tapping is performed. Mouth 6
It can be removed without leaving foreign matter removal. 47 indicates a safety fence.

In the present invention, the pair of trunnions 28 and the pair of trunnions 31 are arranged so that their axes intersect in the trunnion frame 27, and are located in the space defined by the outer frame 30 and the slide frame 32. Since the telescopic hydraulic cylinder 33 is built in the device, the device is compact and agile. In addition, a mobile trolley that mounts the ladle 19
The movable carriage 13 can be effectively used because the movable carriage 13 can be detachably mounted on the movable carriage 13. Although all the cylinders in the apparatus are described as hydraulic cylinders, it is needless to say that electric or pneumatic cylinders may be used.

Next, the operation procedure of the apparatus for removing foreign matter from the tap hole of an electric furnace according to the present invention will be described. As in the conventional example shown in FIG. 20, the amount of molten steel in the furnace is reduced at the end of tapping of the direct-flow electric furnace 1 of the bottom tapping type, and foreign matters such as separated refractories floating in the molten steel or slag. Is clogged in the tap hole 6, and when tapping cannot be performed smoothly, the molten steel and slag are moved to the furnace bottom 4 on the opposite side of the tap hole 6 by tilting the furnace body 2 to expose the tap hole 6. In this state, the molten steel does not leak from the tap hole 6. Then, after moving the movable trolley 13 on which the ladle 8 which has received steel until the end of tapping at the end of tapping from just below the furnace body 2, it is lifted by an overhead crane (not shown) and transported to the next step. I do. At this time, the molten steel remaining in the furnace bottom 4 remains more than usual, but is used as a hot heel for scrap melting at the next operation.

Subsequently, as shown in FIGS. 1 and 2,
Lifting the equipment support base 19 with an overhead crane
Using the ladle support 14 provided on the 13, the positioning guide 21 is set on the positioning post 18 while being placed thereon. The moving carriage 13 is moved to the position of the DC electric furnace 1 and stopped below the tapping hole 6. Activate the lifting hydraulic cylinder 33 to extend the plunger 40, and
Is raised in the outer frame 30. Thereby, the breaker rod 49 disposed on the slide frame 32 is raised. At this time, the slide frame 32 can be smoothly raised by being guided by the guide rollers 34 provided on the upper four side surfaces of the outer frame 30.

Since the furnace body 2 is tilted until the molten steel is not discharged, the tap hole 6 is tilted at an angle θ (see FIG. 11) with respect to the vertical, so that the breaker rod mounted on the hydraulic breaker 45 is Two rocking hydraulic cylinders 38 connected to the lower part of the outer frame 30 so that 49 matches the inclination of the tapping hole 6
Operate. Trunnion provided in trunnion frame 27
The outer frame 30, the slide frame 32 and the hydraulic breaker 45 are connected to the breaker rod by a combination of swinging in two directions orthogonal to each other with the fulcrums 28 and 31 and horizontal turning of the swinging hydraulic cylinder 38 through the vertical shaft 48. Swings together with 49.

Breaker rod mounted on hydraulic breaker 45
When 49 coincides with the inclination angle of the tap hole 6, the telescopic hydraulic cylinder 33 is operated, and as shown in FIG. 11, a breaker rod 49 attached to the hydraulic breaker 45 is inserted into the tap hole 6 from below, Bonds such as ingots and slag adhered to the taphole refractory 52
Raise it to 50 or clogged refractory 51. Then, the hydraulic breaker 45 is actuated to give an impact to the fixed matter 50 and the clogged refractory 51 from the tip of the breaker rod 49, and breaks and removes it. The falling object from inside the tap hole 6 hits the cover 46 and falls laterally, so that damage to the device can be prevented.

Sticking object 50 adhered to inside of tap hole refractory 52
When the removal of the clogged refractory 51 is completed, the operation reverse to that described above is performed to pull out the breaker rod 49 from the inside of the tapping hole 6.
After retreating the movable carriage 13 from immediately below the furnace body 2, the overhead crane (not shown) moves the ladle support table 14 from the ladle support table 14 to the apparatus support platform.
Lift and move 19 to the waiting area. After turning the gate 7 from below to close the tap hole 6, the tap hole 6 is filled with sand to prepare for the next melting and refining. The molten steel remaining in the furnace will be used as hot heat in the next refining.

Next, the tap hole refractory 52 which has been damaged and can no longer be used is removed using the electric furnace tap hole foreign matter removing device of the present invention, and a new tap hole 6 is removed. The procedure for exchanging the tapping hole for mounting the refractory will be described. When the damaged tap hole 6 is to be removed, foreign matter such as a fixed substance 50 adhered to the inside of the tap hole refractory 52 forming the tap hole 6 is first removed. In this case, since the molten steel and the slag in the furnace have been discharged, the furnace body 2 is upright, and the tap hole 6 is vertical. For this reason, devices such as the breaker rod 49 mounted on the hydraulic breaker 45 may be kept almost vertically. The procedure for removing foreign matter is performed in accordance with the removal of foreign matter in the tapping port 6 at the end of tapping, and therefore the description thereof is omitted.

When the removal of the foreign matter adhering to the tap hole 6 is completed, a tap hole exchanging jig 53 having a structure shown in FIGS. 12 to 14 is mounted on a breaker case 44 in which a hydraulic breaker 45 is contained. Using this, tapping hole exchange work is performed efficiently. The tapping outlet exchange jig 53 has a circular saucer 54 at the top, and the circular saucer 54
Has a circular opening 57 at the center, a rectangular connection flange 55 at the bottom, and a rectangular opening 58 at the center of the rectangular connection flange 55. At the circular saucer 54, hanging portions 56 are provided at four places on the circumference, and a rectangular connection flange 55 is provided.
Bolt holes 60 are provided at the four corners. Reference numeral 59 denotes a reinforcing rib of each part.

When replacing the damaged tap hole 6, first, the tap hole exchanging jig 53 is lifted by the overhead crane via the hanging portion 56, and the breaker rod 49 is mounted on the hydraulic breaker 45. After being moved above the breaker case 44, the tapping outlet changing jig 53 is lowered and the breaker case 44
Put on top. The reason why the breaker rod 49 is left attached is to save the time required for removal, and to play a role in preventing the tapping refractory 52 from falling down when removed as described later. Bolts 61 are inserted through bolt holes 60 provided at the four corners of the square connection flange 55, and the tapping port exchange jig 53 is fixed to the upper surface of the breaker case 44 (see FIG. 12). Although the bolt holes 60 and the bolts 61 are used, a pin hole and a pin may be used.

As shown in FIG. 15 by moving the mobile trolley 13,
The position is adjusted so that the breaker rod 49 is below the tapping opening 6. Operate the telescopic hydraulic cylinder 33 in the extension direction,
The breaker rod 49 attached to the hydraulic breaker 45 is raised and inserted into the tapping hole 6 from below. As shown in FIG.
The circular tray 54 of the tapping hole exchange jig 53 is brought into contact with the lower end flange 63 of the tapping port 6 to be in a supported state. When the bolt 64 is removed and the telescopic hydraulic cylinder 33 is slightly actuated in the contraction direction, the sandy exfoliation layer 62 filling the outside of the cylindrical tap hole refractory 52 forming the tap hole 6 becomes cylindrical. Furnace bottom refractory 65
And move downward. As a result, the tap hole 6 is supported on the circular tray 54. As shown in FIG. 17, when the telescopic hydraulic cylinder 33 is operated in the contracting direction, the sandy exfoliation layer is formed.
Steel tap refractory including lower end flange 63 by peeling of 62
52 is extracted downward together with the tapping outlet exchange jig 53.

When the removal of the damaged tap hole refractory 52 is completed, a new tap hole refractory 52 is mounted together with the lower end flange 63, but the procedure is reversed. However, in this case, only the tap hole refractory 52 together with the lower end flange 63 is placed on the circular saucer 54 of the tap hole exchange jig 53, and the tap hole 6
Is set in a cylindrical furnace bottom side refractory 65 that forms Thereafter, the tapping hole 6 is formed by filling the gap formed by the tapping refractory 52 and the furnace bottom refractory 65 with the sandy exfoliation layer 62.

The apparatus for removing foreign matter from the tap hole of an electric furnace according to the present invention is not limited to the above-mentioned structure, and may be, for example, a structure as shown in FIG. That is, the positioning post 18 is erected at one end of the existing ladle support 14 provided on the movable carriage 13, and the device support base 19 is placed on the ladle support 14, and a pair of positioning The guide 21 is fitted into the positioning post 18 and set so as not to be displaced in the horizontal direction as in the case described above.

[0034] The 2 is provided on the apparatus support base 19 at a distance.
An elevating carriage 67 is provided on the guide column 66 so as to be able to move up and down. A bearing 69 is attached to a bracket 68 provided on a side surface of the lifting carriage 67. An elevating hydraulic cylinder 71 is arranged between the bearing 69 and a bearing 70 attached to the upper end of the device support base 19, and the elevating carriage 67 is moved up and down along the guide column 66. The lifting carriage 67
Although the lifting hydraulic cylinder is shown as the lifting and lowering, a rack and pinion system, a ball screw system and the like can also be used as the lifting and lowering mechanism. If the guide roller 34 shown in FIG. 3 is arranged on the lift carriage 67, it is possible to smoothly move up and down along the guide columns 66.

A support frame 73 is provided on the horizontal support frame 72 provided on the lifting carriage 67, and the outer frame shown in FIGS.
Similarly to 27, a rectangular trunnion frame 27 is rotatably supported by a pair of bearings 26 via trunnions 28 on both side surfaces, and a square support frame 73 is disposed inside the trunnion frame 27. . The support frame 73 is rotatably supported via trunnions 31 on bearing bearings 29 provided on the other side surfaces of the trunnion frame 27. Note that the support frame 73 is square, but can be circular.

As shown in FIG. 9, two rocking hydraulic cylinders 38 are connected to the lower outer surface of the support frame 73 as a rocking device so as to be orthogonal to each other in the horizontal direction. Each swing hydraulic cylinder 38 is supported by a bracket 39 taken out from the lower floor 22 downward so as to be able to turn horizontally via a vertical shaft 48. A hydraulic breaker 45 is fixed in a breaker case 44 provided at the upper end of the support frame 73, and a breaker rod 49 is mounted on the hydraulic breaker 45 upward.

In the case of this device, the lifting and lowering operations of the breaker rod 49 provided at the upper end of the support frame 73 are performed by raising and lowering the lifting carriage 67 along the guide columns 66 by the lifting hydraulic cylinder 71. Also, support frame 73
In the swing operation, two swing hydraulic cylinders 38 connected to the lower part of the support frame 73 so as to be orthogonal to each other in the horizontal direction are operated. As a result, swinging in the right-angle direction with the trunnions 28 and 31 provided on the trunnion frame 27 as a fulcrum and horizontal turning of the swinging hydraulic cylinder 38 via the vertical shaft 48 are performed, and the upper end of the support frame 73 is formed. , The breaker rod 45 is freely swung in two orthogonal directions. The operation of removing the foreign matter adhered to the tap hole 5 is the same as the above-described case, and the description thereof will be omitted. In addition, the tapping hole exchange jig 53 having the structure shown in FIGS. 12 to 14 is mounted on the upper portion of the breaker case 44 in which the hydraulic breaker 45 is contained, and the exchange operation is efficiently performed using the jig. Same as in the case.

Further, the foreign matter removing device shown in FIG. 19 can be used. The point at which the apparatus support base 19 is mounted on the movable trolley 13 and the oscillating mechanisms such as the bearing 26, the trunnions 28 and 31 have the same mechanism. This is an example of when you cannot do it. The support frame is divided into a support frame 73A on which the breaker rod 49 side is mounted and another support frame 73B provided with a swing mechanism, and both are connected by parallel links 74A and 74B. Reference numeral 75 denotes a link for transmitting a driving force to the parallel links 74A and 74B, and a lifting hydraulic cylinder 74 is connected to the link 75. In this drawing, each link 74A, 74
It is bonded to B, but it may be either one. Note that 76
Are the links 74A, 74B and the link 75, the support frames 73A, 73
A pin for connecting B is shown, and a swing operation is applied to the support frame 73B by the swing hydraulic cylinder 38. Oscillating hydraulic cylinder 38
Is shown in one line, but has two lines as in FIG.

As another example of raising and lowering the support frame 73A by a link mechanism, each link of 74A and 74B is used as a support arm of the support frame 73A, and a rack and pinion structure, a ball screw structure and the like are mounted on the support frame 73B. The same operation can be performed even if the support arm is attached so as to be able to drive up and down. In the above-described embodiment, the case where the present invention is applied to the DC-type electric furnace for steelmaking has been described. However, it is needless to say that the present invention can be similarly applied to the AC-type electric furnace for steelmaking. .

[0040]

As described above, according to the tapping foreign matter removing device for an electric furnace according to the present invention, foreign matter adhering to inside during tapping from an eccentric bottom tapping type tapping port is removed. The breaker rod attached to the breaker provided in the mouth foreign matter removing device is operated by using a supporting frame supporting the same and a supporting frame swinging device that swings in two directions orthogonal to a telescopic (elevating / lowering) device. From a short time, and safely,
Since it can be reliably removed, stable operation of the electric furnace and the next process is achieved.

Also, a detachable tap hole replacement jig is mounted on the breaker case, the damaged tap hole refractory is removed by using the jig, and the tap hole mounting port for attaching a new tap hole refractory is used. Can be performed efficiently, and the effect obtained is enormous.

[Brief description of the drawings]

FIG. 1 is a side view showing an apparatus for removing foreign matter at a tapping port of an electric furnace according to the present invention.

FIG. 2 is a front view showing an apparatus for removing foreign matter at a tapping hole of an electric furnace according to the present invention.

FIG. 3 is a partially enlarged side view showing the structure of the upper part of the outer frame of the present invention in a half on the right side.

FIG. 4 is a sectional view showing the direction of arrow AA in FIG. 3;

FIG. 5 is a side view showing an outer frame of the present invention.

FIG. 6 is a sectional view showing the direction of arrow AA in FIG. 5;

FIG. 7 is a side view showing the slide frame of the present invention.

FIG. 8 is a cross-sectional view showing the direction of arrow AA in FIG. 7;

FIG. 9 is a side view showing an arrangement of a swing hydraulic cylinder arranged at a lower portion of the outer frame of the present invention.

FIG. 10 is a side view showing an arrangement of an outer frame, a slide frame, an extendable hydraulic cylinder, and a breaker rod mounted on a breaker according to the present invention.

FIG. 11 is an explanatory diagram showing a situation in which foreign matter attached to a tapping hole is removed using a breaker rod mounted on the breaker of the present invention.

FIG. 12 is a cross-sectional view showing a tapping-exchange jig of the present invention.

FIG. 13 is a plan view showing the direction of arrow AA in FIG. 12;

FIG. 14 is a plan view showing the direction of arrow BB in FIG. 12;

FIG. 15 is an explanatory diagram showing a state before starting the removal of a tapping hole refractory using the tapping port exchange jig of the present invention.

FIG. 16 is an explanatory view showing a state in which the tapping-exchange jig of the present invention is connected to the tapping port.

FIG. 17 is an explanatory view showing a state in which a tap hole refractory is removed using the tap hole exchanging jig of the present invention.

FIG. 18 is a side view showing another tapping port foreign matter removing device of the present invention.

FIG. 19 is a side view showing another tapping port foreign matter removing device of the present invention.

FIG. 20 is an overall view showing an arrangement of a conventional eccentric hearth tapping type direct-current electric furnace and a movable cart on which a ladle is placed.

[Explanation of symbols]

 Reference Signs List 1 DC electric furnace 2 Furnace 3 Furnace lid 4 Furnace bottom 5 Tapping section 6 Tapping port 7 Opening gate 8 Ladle 9 Tilting hydraulic cylinder 10 Graphite electrode 11 Iron electrode 12 Rail 13 Moving carriage 14 Ladle support 15 Ladle trunnion 16, 39, 68 Bracket 17 Foundation 18 Positioning post 19 Device support stand 20 Wheel 21 Positioning guide 22 Lower floor 23 Suspended floor 24 Upper floor 25 Leveling jigs 26, 42, 69, 70 Bearing 27 Trunnion Frame 28, 31 Trunnion 29 Bearing bearing 30 Outer frame 32 Slide frame 33 Telescopic hydraulic cylinder 34 Guide roller 35 Groove 36 Guide rail 37 Opening 38 Hydraulic cylinder for swing 40 Plunger 41 Breaker support member 43 Pin 44 Breaker case 45 Hydraulic breaker 46 Cover 47 Safety fence 48 Vertical axis 49 Breaker rod 50 Fixed object 51 Clogged refractory 52 Tap hole refractory 53 Tap hole exchange jig 54 Circular pan 55 Square connection flange 56 Lifting hook 57 Shape opening 58 Square opening 59 Reinforcement rib 60 Bolt hole 61, 64 Bolt 62 Sandy layer 63 Lower flange 65 Furnace bottom refractory 66 Guide column 67 Elevating carriage 71 Elevating hydraulic cylinder 72 Horizontal support frame 73 Support frame 74A, 74B Parallel link 75 link 76 pin

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor: Shin Ueda 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Pref. 1-chome (without address) Kawatetsu Machinery Co., Ltd. F-term (reference) 4K014 CD14 4K056 AA02 AA05 BA03 BA06 BB08 CA01 EA01

Claims (10)

[Claims] An apparatus for removing foreign matter from a tapping outlet of an electric furnace, comprising: a breaker case holding a breaker having a breaker rod detachably mounted upwardly; a support frame connected to the breaker case; and a support frame connected to the breaker case. An apparatus for removing foreign matter at a tapping outlet of an electric furnace, comprising: a telescopic device that expands and contracts; and a support frame swing device that supports and swings the support frame. 2. A device for removing foreign matter at a tapping outlet of an electric furnace, comprising: a breaker case holding a breaker having a breaker rod detachably mounted upwardly; a support frame connected to the breaker case; An apparatus for removing foreign matter at a tapping outlet of an electric furnace, comprising: a telescopic device for expanding and contracting; and a supporting frame rocking device for supporting and rocking the support frame together with the telescopic device. 3. An apparatus for removing foreign matter at a tapping hole of an electric furnace, wherein a breaker case holding a breaker in which a breaker rod is detachably mounted upward and a support frame connected to the breaker case are supported to swing. A supporting frame swinging device,
An elevating device for raising and lowering the support frame together with the support frame rocking device. 4. The support frame includes a slide frame and an outer frame fitted outside the slide frame, and the outer frame swingably surrounds an upper side surface of the outer frame via a bearing and a trunnion. 3. The removal of foreign matter at a tapping hole of an electric furnace according to claim 1, wherein the trunnion frame is supported by a supporting frame for the apparatus so as to be swingable via a bearing and a trunnion. apparatus. 5. A guide rail disposed in parallel with each of the outer surfaces formed by the slide frame and spaced apart in a length direction of each outer surface, and a guide disposed on the outer frame and disposed on the slide frame. 5. The apparatus as claimed in claim 4, further comprising a guide roller for guiding the outer surface of the slide frame from four sides between the rails. 6. The electric device according to claim 4, wherein the oscillating device connected to each of two orthogonal side surfaces at a lower end of the outer frame and supported by an apparatus support base is a cylinder. Furnace outlet foreign matter removal equipment. 7. The electric furnace according to claim 1, wherein a cover for preventing foreign matter collision is attached to an upper end of a breaker case for storing and setting the breaker. Steel tapping foreign material removal equipment. 8. A jig for exchanging a tapping hole is detachably provided on an upper surface of a breaker case in which the breaker is housed and set. Or a tapping foreign matter removing device for an electric furnace according to 7. 9. The apparatus support gantry is placed on a ladle support of a ladle moving trolley, and a positioning guide provided on the apparatus support gantry is attached to a positioning post provided near the ladle support. 3. A fitting according to claim 1, wherein
3. The apparatus for removing foreign matter at a tapping hole of an electric furnace according to 3, 4, 5, 6, 7, or 8. 10. The apparatus according to claim 1, wherein the supporting frame for the apparatus is installed on a dedicated movable cart.
4. The apparatus for removing foreign matter at a tapping hole of an electric furnace according to 4, 5, 6, 7 or 8.