JPH10102125A - Device for removing stuck metal on furnace opening part of converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and surely remove the stuck metal on a furnace opening part with variuous kinds of modes by using a burner arm to be freely vertically shiftable, freely advancable/retreatable and freely turnable in the body peripheral direction and turning a burner arm holding frame in the body peripheral direction. SOLUTION: The burner arm 7a is fitted so as to be freely turn-able to the burner arm holding frame 6, and the tip part 7 of the burner arm is pivotally supported so as to be freely turnable in the body peripheral direction of the burner arm 7a. The tip part 7 of the burner arm is freely turnable by engaging the pivotal part 9b at the lower part of the burner arm holding frame 6 with the engaging members 8a, 8b. A burner 11 is fitted to the tip part 7 of this burner arm and freely turnable by using a pivotal part 9f as the supporting point and freely turned downward and upward by using a pivotal part 9e as the supporting point. The tip part 7 of the burner arm is freely vertically shiftable and freely advancable/retreatable. At the time of cutting off the stuck metal on the furnace opening part of the converter, after positioning the furnace body to an optional angle, the burner 11 at the tip part of the burner arm 7a is shifted to the metal cutting-off starting position and directed to a prescribed swing angle and a turning, angle of elevation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing ingots attached to a converter furnace mouth.

[0002]

2. Description of the Related Art As a device for removing ingots from a converter mouth, there has been proposed a method in which a tip of a burner is provided in front of a converter mouth so as to be movable up and down, forward and backward, and cut and remove the ingots. −
No. 87710. Japanese Patent Application Laid-Open No. 6-25728 discloses that a burner is movably provided by combining vertical movement, horizontal movement, vertical movement and horizontal movement.

[0003]

As is well known, the converter furnace opening has a curved inclined structure, and the metal is attached in various forms such as a curved form and a difference in thickness. Therefore, it is extremely difficult to reliably remove even if the metal is simply cut (blown). That is, in the operation of the burner as described above, since the metal is cut transversely partially in the thickness direction, not only when the metal ingot thickness is thick, but also when the metal ingot is thin, the cutting distance is long and a long time is required. . In addition, it is difficult to accurately cut the furnace wall over the entire length of the cut portion, and there is a problem that the metal cannot be reliably removed. In addition, in the adhered metal, unspecified amounts of slag (oxide) are mixed in unspecified locations, making it difficult to perform high-speed cutting with a burner. There are issues such as inability to do so. The apparatus of the present invention has been made to solve such a problem advantageously, and it is an object of the present invention to provide an apparatus for removing ingots attached to a converter furnace mouth, which can surely cut and remove ingots. Things.

[0004]

A feature of the present invention is that a burner arm is provided above a burner arm holding frame so as to be movable up and down, forward and backward, and rotatable in a trunk circumferential direction. A device for removing ingots from a converter furnace mouth, wherein a holding frame is provided rotatably in a trunk circumferential direction, and a tip of the burner is provided at a tip portion of the burner arm so as to be freely rotatable and raised.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, it is difficult to reliably remove ingots attached to a converter furnace mouth by simple cutting depending on the thickness, attachment position, slag content, and the like. In addition, when cutting metal, the refractory and the steel shell of the converter furnace body may be melted and damaged by the heat at the time of cutting, so that the burner requires precise operation. Further, the slab removal operation is restricted in terms of time since the smelting and refining of molten steel in the converter and then tapping take a little time during preparation for the next smelting to remove the slab. As a result, the present inventors have conducted various studies on a suitable cutting form for quickly and reliably removing the converter without damaging it, and as a result, the deposited metal was thin, and there was no time to spare. When the damage of the refractory of the inclined part 4 of the converter furnace body shown in FIG. 6 is slight, as shown in FIG.
1 is sequentially moved to positions a, b, and c, and after cutting 3 (radial cutting mode) of the metal core adhering metal 2a of the metal core 2 of the furnace, the burner 11 is operated and moved to the position of d to incline. Cutting the metal 2b of the part 4 (inclined part radial cutting mode)
As shown in FIG. 8, the ring-shaped ingot is cut into three pieces by radial cutting as shown in FIG. 8, and as shown in FIG. , Can be reliably removed. In addition, when the adhered metal 2 is thick and the refractory in the inclined portion of the converter body is greatly damaged, the burner 11 is operated as shown in FIG. 10 to cut the metal 2 as shown in FIG. Mode), it is possible to surely separate the refractory from the furnace port, and at the same time, it is possible to protect the inclined portion 4 refractory and prolong the life of the converter.

As shown in FIG. 12, in the cutting 3 of the base metal 2 as described above, the heating agent injection port 23 of the burner 11 composed of the heating gas injection port 22 and the heating agent injection port 23.
However, as shown in FIG. 13, the extruder moves so as to precede the burner 11 in the advancing direction, cuts the metal, thereby spraying the exothermic agent to the position of the metal 2 cut 3, and then heating gas (from the heating gas injection port 22). By blowing oxygen gas or the like), the exothermic agent is burned to raise the temperature of the three cut portions to improve the cutting ability. In order to improve the cutting ability in this way, for example, when moving the burner 11 in an arc shape, the cutting 3
The heating agent injection port 23 of the burner 11 which rotates along the
Is configured to be rotatable so as to be positioned at three cutting positions in advance, whereby the base metal 2 can be quickly and efficiently removed. That is, in the apparatus of the present invention, in response to the frequent use of the metal ingot on the converter furnace port, quickly and reliably,
Moreover, it can be optimally cut so that it can be easily removed without damaging the converter furnace body.

[0007] By selecting the metal cutting mode of the arc cutting, the radial cutting, and the radial cutting of the inclined portion, if the shape, capacity, and the like of a commonly used oxygen top-blowing furnace are used, the form of the metal is attached. Accordingly, the metal can be cut and removed reliably and quickly. However, in the metal cutting mode as described above due to the shape of the converter, if the metal is in a form in which it is difficult to cut the metal quickly, it can be easily removed. The metal cutting mode is changed to a metal cutting mode that can be cut and removed, or is added to or partially replaced with the metal cutting mode as described above to remove adhered metal.

Next, as a mechanism for reliably cutting the bullion in accordance with the bullion cutting mode as described above, the burner is configured to be movable up and down, forward and backward, and rotatable in the horizontal direction. As shown in FIG. 7, the control mechanism is configured to be capable of moving in an arc-like and radial manner, and the burner main body is configured to be rotatable and to be movable crossing the turning direction (upward and downward).
As shown in (1), the burner 11 is provided with a control mechanism capable of moving the burner 11 from the inside of the furnace port to the surface of the base metal 2 by curving. Further, the burner main body is configured to be rotatable, and a control mechanism for rotating the burner 11 in accordance with the cutting direction is added as shown in FIG. With such a mechanism, it is possible to reliably and efficiently cut the metal in accordance with the local metal cutting mode. Moreover, by employing such a mechanism, the burner can be moved in the direction of the burner in accordance with the tilt angle of the converter, so that the furnace wall can be cut accurately and the metal can be reliably removed. Such an ingot removing device can quickly remove the ingot by cutting the ingot with one or a plurality of machines depending on the size of the converter furnace opening and the like.

[0009] Such a bullion removing device cuts and removes the bullion by automatic control to improve work efficiency and save labor. As the automatic control mechanism, for example, a converter tilt angle detecting mechanism is disposed on the tilt axis of the converter, and when tilting is stopped at the position of the slab removing device, the tilt angle is detected and a metal cutting mode selection instruction is issued. The mechanism is guided to recognize the relative position (distance) and relative angle between the burner and the converter furnace opening. When a moving mechanism is added to the metal removal device, a position recognition mechanism is provided on the metal removal device or the fixed floor to recognize the relative position with respect to the converter. On the other hand, the ingot cutting mode selection instructing mechanism memorizes the ingot cutting mode, and the operator selects the ingot cutting mode from the form of ingot adhesion to the converter furnace mouth by a camera or visually and selects the ingot cutting mode. Instruct the selection instructing mechanism, and at the same time, instruct the trajectory calculation of the burner according to the instruction mode from the ingot cutting mode selection instructing mechanism to the ingot cutting orbit controller mechanism. It can be operated along to automatically cut the bullion based on the instruction mode.

Further, in addition to the above-mentioned automatic control mechanism, a mechanism which enables remote control and which can freely switch between automatic and remote control is employed. This makes it possible to easily change the cutting trajectory when a slag lump that is extremely difficult to melt appears in the metal, or when the amount of metal is large and there is a concern that the device may be damaged due to contact with the burner. In addition, when the cutting ability is insufficient due to a sudden change in the thickness of the metal during cutting or the appearance of slag, it is possible to return the cutting position or reduce the speed. Further, it is possible to quickly evacuate in an emergency such as damage to the apparatus due to the fall of the metal or melting of the burner due to heat or the like. As described above, by using the automatic control and the remote control together, the most efficient and safe metal removal can be reliably performed.

[0011]

Next, an embodiment of the present invention will be described. Figure 1,
2 and 3, a burner arm 7a is rotatably mounted on a pivot 9c above the burner arm holding frame 6, and a burner arm tip 7 is rotatably mounted on the burner arm 7a in the circumferential direction of the burner arm 9d. The lower part of the burner arm holding frame 6 is mounted on the shaft 9b, and the engaging members 8a, 8b are mounted on the shafts 9b, 1b.
The burner arm holding frame 6 is tilted in the forward retreating direction of the burner arm 7a and the engaging member 8a in the vertical direction with the shaft attachment 9b at the lower part of the burner arm holding frame 6 engaged as a fulcrum. As shown in FIG. 4, the tip 7 of the burner arm is configured to be movable up and down and forward. Further, the burner arm holding frame 6 is rotatably mounted on the base 5 so as to be rotatable in the trunk circumferential direction, and the burner arm 7 provided on the burner arm holding frame 6 is configured to be rotatable. A burner 11 is attached to the tip of such a burner arm tip 7 via a mounting member 12 with a pivot 9f as a fulcrum.
It is provided so that it can be raised and lowered (moves crossing in the turning direction) with the shaft attachment 9e as a fulcrum. In the figure, reference numeral 13 denotes a driving motor.

As described above, when cutting metal in the arc cutting mode, the converter is tilted to position the furnace body at an arbitrary angle near the horizontal, and then the fulcrums 9a, 9b and 9c are rotated. Thus, the burner 11 at the tip of the burner arm 7a is moved to the metal cutting start position, and the fulcrums 9e and 9f are rotated to turn the burner 11 to a predetermined turning angle and elevation angle calculated from the tilt angle of the furnace body. . afterwards,
While injecting oxygen gas or the like from the burner 11, the burner arm 7 is rotated in the circumferential direction around the shaft 9d.
The a, 9b, 9c, 9e and 9f are tuned and rotated to move the burner 11 along the furnace wall of the substantially circular furnace port while rotating, thereby cutting the arc into a set radius. When cutting the metal in accordance with the radial cutting mode, the burner 11 is similarly moved to the metal cutting start position of the furnace port, and then the burner 11 is moved by rotating 9a, 9b, 9c, 9e and 9f to cut the metal. I do. Thereafter, the burner arm 7 is rotated in the circumferential direction of the body, and by operating the respective shafts in the same manner, the burner arm 7 is moved to the next cutting start position, and is sequentially positioned at the radial cutting site to perform cutting. Further, when cutting the metal in the inclined part radial cutting mode, 9a, 9
After operating the shafts b and 9c to position the burner 11 on the inclined portion inside the furnace port, the burner arm 7 is sequentially moved to the cut portion.
Is rotated in the body circumferential direction, and the optimum swivel angle and the elevation angle that does not damage the refractory are calculated from the inclination angle of the inclined part and the furnace inclination angle, and 9e and 9f are operated to move the burner 11 to incline. Is cut radially from the part to the outside of the furnace opening. As described above, in each metal cutting, the burner 11 can be cut transversely along the furnace wall, and it can be reliably cut longitudinally along the metal surface in the thickness direction of the metal to the furnace wall. Cutting that can reliably remove the metal in a short time without damage can be performed.

Next, an example in which the above-described sliver removing device is operated by an automatic control mechanism will be described. In FIG.
A tilt angle detecting mechanism 14 and a relative position recognizing mechanism 21 are provided on a tilt shaft portion of the converter 1, and the converter 1 is tilted to remove a metal ingot 15
When the tilt angle and the relative position are guided to the slab cutting mode selection instructing mechanism 16 when the stop position is in front of the slab, the relative position and the relative angle between the converter 1 (furnace slab slab 2) and the slab removing device 15 are checked. At the same time, the camera 17 transmits the adhesion form of the metal 2 to the cutting state monitoring mechanism 18 including the image processing device,
Based on this, the operator determines the sliver cutting mode and inputs it to the sliver cutting mode selection mechanism 16,
From the bullion cutting mode selection instructing mechanism 16 to the burner bullion cutting trajectory controller mechanism 19, the trajectory based on the cutting mode, the holding distance between the burner 11 and the bullion, the bullion cutting range, etc. are determined as the trajectory of the burner 11 as the trajectory. Based on this, the bullion removing device 15 is automatically controlled to cut and remove the bullion.

During the cutting of the metal 2, the camera 1
When the cutting status is grasped in step 7 and the cutting (fusing) flame changes and the cutting speed is reduced due to slag mixed in the metal, etc., the position and direction of the burner 11 are changed or the burner moving speed is changed. , Further increase of oxygen gas supply, addition of LPG,
Based on the judgment of the necessity of addition of Al as a heating agent, the operator operates the remote control mechanism 20 including the cutting capacity adjusting device, the burner remote operation mechanism, and the automatic remote switching mechanism based on the judgment, thereby changing the operation of the burner. By taking measures such as increasing the supply amount of oxygen gas, it is possible to cut metal more reliably and quickly, which is effective.

[0015]

According to the apparatus of the present invention, cutting can be performed according to various cutting modes depending on the form of adhesion of the slab, and the slab can be quickly and reliably removed. Also,
Ingots can be removed quickly, the operation rate of the converter can be improved, and productivity can be increased. Further, excellent effects such as labor saving of the slab removal operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the device of the present invention.

FIG. 2 is a plan view showing an embodiment of the device of the present invention.

FIG. 3 is a rear view showing the embodiment of the device of the present invention.

FIG. 4 is a side view showing an embodiment of the device of the present invention.

FIG. 5 is a flowchart showing an embodiment of the apparatus of the present invention.

FIG. 6 is a side view showing the state of adhesion of the metal.

FIG. 7 is a side sectional view showing a cutting state of a metal.

FIG. 8 is a front view showing a metal cutting mode.

FIG. 9 is a side sectional view showing a removal state after cutting the metal.

FIG. 10 is a perspective view showing a cutting state of a bullion.

FIG. 11 is a front view showing a metal cutting mode.

FIG. 12 is a perspective view of a burner.

FIG. 13 is a plan view showing a cutting state of a bullion.

[Explanation of symbols]

 6 Burner arm holding frame 7 Burner arm 11 Burner

Claims (3)

[Claims] 1. A burner arm is provided above a burner arm holding frame so as to be vertically movable, forwardly retreatable, and rotatable in a body circumferential direction, and the burner arm holding frame is provided so as to be rotatable in a body circumferential direction. An apparatus for removing ingots attached to a converter furnace mouth, wherein a tip of a burner is provided at a tip of an arm so that the tip of the burner can be freely turned and raised. 2. An automatic control mechanism comprising a converter tilt angle detecting mechanism, a metal cutting mode selection instructing mechanism, and a burner metal cutting track controller mechanism, which are linked to each other. A device for removing ingots from converter mouths. 3. The converter furnace port attachment according to claim 1, wherein a remote control mechanism comprising a burner remote operation mechanism and an automatic remote switching mechanism and a cutting status monitoring mechanism are linked. Ingot removal device.