JPH11230680A - Dismantling apparatus for melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the efficiency of dismantling or repairing work of melting furnace which conventionally requires a long waiting time before the furnace is cooled down after delivering molten steel. SOLUTION: The apparatus for dismantling a melting furnace 1 comprises a beam section 7 disposed substantially horizontally above an electric furnace 3, a body 8 turnable by 360 deg. about the axis P, an outer boom 11 provided swingingly on the turning body 9, an inner boom 13, and a breaker 15 for crushing refractory bricks 5. The turning body 9 and the outer boom 11 are operated at an operating section. Since the apparatus 1 can be operated from the outside of the electric furnace 3, operation can be started even if the temperature is too high for a worker to enter into the furnace. The working time can be shortened from about 5 hours to only 2.5 hours.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melting furnace dismantling device for dismantling a melting furnace by crushing a structure such as a refractory brick used in the melting furnace using a concrete breaker or the like.

[0002]

2. Description of the Related Art Iron chips are put into an electric furnace which is rotatable about a horizontal axis, and arc discharge is performed from an electrode placed in the furnace from above, thereby melting the iron chips and removing the furnace itself. Shake to discharge molten steel (tapping).

[0003] The inside of an electric furnace is mainly made of refractory bricks. However, the refractory bricks are also eroded by high temperatures. Therefore, it is necessary to crush the eroded portions once a month and replace them with new refractory bricks. There is. For example, in the case of a furnace having a diameter of about 6 m, first, an electrode or the like disposed above the furnace is removed, an iron plate is put into the furnace, and a shovel excavator (hereinafter, referred to as an excavator) is placed on the iron plate. Put on. A concrete breaker (hereinafter also referred to as a breaker) attached to the front attachment of the excavator was operated to crush the damaged bricks, and the fragments were taken out of the furnace together with the iron plate and repaired with new refractory bricks. .

[0004]

The excavator is occupied by an operator, but the inside of the furnace immediately after tapping is extremely hot, and has a temperature of about 500 to 1000 ° C. Moreover, it is hard to cool,
Even after 4 hours from the injection of water, the temperature was still as high as 80 ° C., and the time required for the operator to wait for the temperature to drop was a major cause of inefficiency.

[0005] In a part where the excavator does not reach (the center of the furnace), an operator enters the furnace with a breaker and crushes the brick, but there is a similar problem. In addition, in any case, when the high-temperature brick is crushed, there is a problem that the tip of the breaker is worn faster than when crushing asphalt or concrete.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to improve the efficiency of the melting furnace dismantling operation. A second object of the present invention is to make the dismantling device according to the first embodiment resistant to a shock at the time of crushing.

The present invention described in claim 3 proposes an embodiment suitable for realizing the disassembly device described in claim 2. A fourth object of the present invention is to extend the life of the tip of the breaker when crushing a brick in the dismantling apparatus according to any one of the first to third aspects.

[0008]

Means for Solving the Problems and Effects of the Invention The present invention according to claim 1, which has been made to solve such problems, uses a concrete breaker or the like to provide a refractory brick or the like used in a melting furnace. A melting furnace dismantling device for dismantling the melting furnace by crushing the structure of the melting furnace, wherein the melting furnace is traversed above the melting furnace and disposed substantially horizontally by supporting both ends in the longitudinal direction. A girder portion, disposed from the girder portion toward the melting furnace, locating a tip on the structure in the melting furnace, and attaching and operating at least the concrete breaker on the tip. It is characterized by comprising a manipulator that is enabled, and an operation unit that is provided outside the melting furnace and that operates a tip of the manipulator.

That is, an overhanging girder portion is provided in the furnace, and a manipulator is provided in this. In advance,
After removing the electrodes and the like from the furnace, the manipulator is put into the furnace, and the refractory bricks and the like are crushed using a breaker at the tip. Since the girder portion is supported at both ends, the manipulator can be supported with a simple structure, and the manipulator itself may have enough strength to withstand the reaction force accompanying crushing.

On the other hand, if the girder has a cantilever structure or a manipulator only structure, the disassembly device is required to support an extra load, especially the weight of the manipulator (in the former case, the girder) at one end. The whole becomes large,
In particular, it is necessary to adopt a structure having high strength, but according to the present invention, this is not the case.

Since the manipulator is operated from outside the furnace through the operation unit, even if the temperature is so high that no worker can enter the furnace, the breaker or the manipulator does not cause an abnormality due to heat. If it is temperature, work can be started. Therefore, the dismantling work time can be significantly reduced.

According to a second aspect of the present invention, in the melting furnace disassembly apparatus according to the first aspect, the girder portion has both ends in the longitudinal direction extending vertically and substantially horizontally with the girder portion. And a hand mechanism which is suspended from at least one end of the both ends of the girder portion and clamps the rail at its tip, further comprising the hand mechanism and the girder portion. Is characterized by being axially mounted with a shear pin.

That is, the disassembling apparatus is mounted on a rail and fixed by clamping the rail with a hand mechanism. In addition, the hand mechanism is a shear pin, which is pivotally mounted on the spar. This prevents the shear pin from breaking when an excessive force is applied to the hand mechanism, thereby preventing the dismantling device itself and the rail from being damaged or deformed.

Therefore, according to this dismantling device, even if the breaker hits the metal sticking to the refractory brick, the manipulator is destroyed by the reaction force or the dismantling device falls into the furnace by the reaction. There is no. Furthermore,
According to a third aspect of the present invention, in the melting furnace dismantling apparatus according to the second aspect, at least one of the rails is a melting furnace closed dust collector (Sky House) in which the melting furnace is installed. A wheel provided at the lower end of the vehicle also serves as a running rail.

In this case, it is not necessary to newly install one of the rails. In particular, when a plurality of melting furnaces are arranged in parallel with this rail, the melting furnace dismantling device can be installed simply by laying the other rail for each furnace. Of course, if possible, the other rail may be a rail for running wheels attached to the sky house.

According to a fourth aspect of the present invention, in the melting furnace dismantling apparatus according to any one of the first to third aspects, a tip cooling unit for injecting air to a tip of the concrete breaker attached to a tip of the manipulator. , Is provided. In this case, since the tip of the breaker heated by crushing the refractory brick or the like is cooled, abrasion can be minimized.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 is a front view showing a state in which a refractory brick 5 of an electric furnace 3 is crushed using a melting furnace dismantling device 1 according to one embodiment of the present invention. As shown in the figure, the melting furnace dismantling apparatus 1 includes a girder 7 installed substantially horizontally above the electric furnace 3, and a swivel provided to be able to turn around the axis P by 360 ° below the girder 7. Body 9 and revolving body 9
Outer boom 1 provided to be able to swing around axis Q
1, an inner boom 13 fitted inside the outer boom 11, and a breaker 15 attached to a front attachment (not shown) provided at the tip of the inner boom 13. The revolving superstructure 9, the outer boom 11, the inner boom 13, and a hydraulic cylinder (described later) for driving these correspond to the manipulator of the present invention.

In this drawing of the girder portion 7, legs 2
1 and 23 are provided, each of which is a rail 25,
27. The rail 25 is a rail on which wheels provided at the lower end of a melting furnace closed type dust collector (Sky House) in which the electric furnace 3 is installed run, and usually,
The sky house is opened and closed by running the wheels on this rail.

The swing of the outer boom 11 is performed by the rod 31 extending and contracting by hydraulic pressure. The inner boom 13 is extended and contracted by a hydraulic cylinder 33 provided inside the outer boom 11 and indicated by a broken line.
Further, the front attachment can be tilted about the point R as an axis, and is tilted when the rod 35 is expanded and contracted by hydraulic pressure. The tip of the breaker 15 can be located at an arbitrary position in the electric furnace 3 by the four-axis movement obtained by adding the rotation about the axis P to the three-axis movement. Although a hydraulic pressure is used, this pressure source is generated by a hydraulic unit indicated by reference numeral 41. By designating a hydraulic cylinder to be pressurized (or depressurized) on an operation panel (not shown), the tip of the breaker 15 can be moved to a desired position.

The manipulator has booms 11 and 13
And the hydraulic cylinder 33 and the like, it is strong against the reaction force received during the crushing operation. Note that 45
Is a tap hole of the electric furnace 3, and 47 is a tap hole. FIG. 2 shows a state in which the melting furnace dismantling apparatus 1 is viewed from above. As shown in this figure, the girder part 7 is positioned so as to pass through the center of the circular electric furnace 3, and the rotating body 9 is rotated as shown by the arrow T. When the electric furnace 3 is restarted after the repair,
The melting furnace dismantling device 1 is detached from the rails 25 and 27.

The attachment of the melting furnace dismantling device 1 and the rail 27 is shown in FIG. FIG. 3 is an enlarged perspective view of the vicinity of the leg 23. In addition, for convenience of explanation, the description is omitted as appropriate and a part is shown in perspective. As shown in this figure, leg 2
No. 3 is in a state where it is merely riding on the rail 27 at the recess at the lower end. And approximately in the center of the two legs 23,
The clamp device 51 is suspended with a shear pin at the position of the shaft U. The clamping device 51 includes a gripper 53 for clamping the rail 27 and a hydraulic cylinder 55 for driving the gripper 53.
The gripping section 53 clamps the rail 27 by the hydraulic pressure supplied from the hydraulic unit 41. When removing the melting furnace dismantling device 1 from the rails 25 and 27,
The hydraulic cylinder 55 is depressurized to open the grip 53, and the clamp is released. Note that the gripping portion 53 and the end of the piston operated by the hydraulic cylinder 55 are also fixed with a shear pin (position V). The shear pin itself breaks when a load equal to or more than a predetermined value is applied, thereby preventing damage to surrounding structures. The clamp device 51 corresponds to a hand mechanism of the present invention.

Note that the leg 21 side is also substantially the same as in this drawing. In other words, the two legs 21 only ride on the rails 25, and the rails 25 are clamped by a clamp device (not shown) suspended at the center of the legs 21. Next, the periphery of the breaker 15 is shown in FIG. As shown in the figure, a nozzle 61 extends from the inner boom 13 to the breaker 15, and the tip 63 of the breaker 15 is cooled by air jetted from the nozzle 61. Thereby, the temperature of the tip portion 63 is reduced, and the promotion of wear due to the heat received from the refractory brick is suppressed. That is, the nozzle 61 corresponds to the tip cooling unit of the present invention. The nozzle 65 is for cooling the pin bush, thereby preventing the pin bush from being damaged by heat. The pressure of the air injected from these nozzles 61 and 65 is set to 4 kg / cm 2, and the air used as a pneumatic source or the like in the factory where the electric furnace 3 is installed is diverted. Reference numeral 67 denotes a pipe for supplying a hydraulic pressure serving as power to the breaker 15.

When the crushing of the refractory brick thus damaged is completed, the breaker 15 is replaced with a bucket (not shown) to remove the debris. According to the melting furnace dismantling apparatus 1 configured as described above, since the girder portion 7 is supported at both ends by the rails 25 and 27, the revolving unit 9 and the outer boom 11 and the like have a simple structure as illustrated. Can be supported.

Since there is no need for a person to enter the electric furnace 3, even if the temperature is so high that no worker can enter, if the breaker 15 and the manipulator are at a temperature that does not cause abnormalities due to heat, Work can begin. When they actually did it, they succeeded in reducing the work that previously took about five hours to two and a half hours. This is a case of partial repair, but it is expected to be further shortened in the work of dismantling and repairing all refractory bricks, which is required about once or twice a year. Conventionally, this operation took about 15 hours, but is expected to be reduced to about 7 and a half hours.

The rails 25, 2 of the melting furnace dismantling device 1
7 is fixed by the shear pin, so even if the manipulator receives a large reaction force during the dismantling work,
Only the shear pin is broken, so that the manipulator is not broken, and the melting furnace dismantling device 1 does not drop onto the electric furnace 3 due to reaction.

Further, the tip 63 of the breaker 15 is cooled by the air blown out from the nozzle 61, so that the abrasion due to the heat received from the refractory brick is suppressed,
3 can be extended. As described above, the melting furnace dismantling apparatus 1 has been described as one embodiment of the present invention, but the present invention is not limited to this embodiment at all and can be implemented in various embodiments.

For example, in the above embodiment, the present invention is applied to an electric furnace. However, if the furnace is made of a refractory brick or, similarly, a material that needs to be periodically dismantled, the melting furnace dismantling apparatus 1 may be used. Good. And, depending on the crushing target, the breaker 1
Other than 5 may be used. Also, the melting furnace dismantling device 1
Furnace and inner boom 13 that are too large to reach
If the furnace is too small to be positioned at every corner (especially at the bottom) inside the furnace even if the furnace is shrunk, the design of the melting furnace dismantling device should be changed and the size should be adjusted to the size of the furnace. It is good to use the melting furnace dismantling device of the above.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a melting furnace dismantling apparatus 1 to which the present invention is applied.

FIG. 2 is a plan view of the melting furnace dismantling device 1. FIG.

FIG. 3 is a perspective view showing a clamp device 51 of the melting furnace dismantling device 1.

FIG. 4 is an explanatory view showing the periphery of a breaker 15;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Melting furnace dismantling apparatus 3 ... Electric furnace 5 ... Refractory brick 7 ... Girder part 9 ... Revolving body 11 ... Outer boom 15 ... Inner boom 15 ... Breaker 21, 23 ... Leg 25, 27 ... Rail 33, 55 ... Hydraulic cylinder 41 ... Hydraulic unit 51 ... Clamping device 53 ... Grip part 61,65 ... Nozzle 63 ... Tip

Claims (4)

[Claims] 1. A melting furnace dismantling apparatus for dismantling a melting furnace by using a concrete breaker or the like to crush structures such as refractory bricks used in the melting furnace, A girder traversing the melting furnace and disposed substantially horizontally by supporting both ends in the longitudinal direction; and a girder disposed from the girder toward the melting furnace, and the structure in the melting furnace includes: A manipulator capable of locating the tip, and attaching and operating at least the concrete breaker at the tip, and an operation unit provided outside the melting furnace for operating the tip of the manipulator. A melting furnace dismantling device comprising: 2. The girder portion is such that both ends in the longitudinal direction are mounted on rails extending vertically and substantially horizontally with the girder portion. 2. A hand mechanism which is hung from at least one end and clamps the rail at the tip thereof, further comprising: a hand pin and the girder part are pivotally mounted by a shear pin. Melting furnace dismantling equipment. 3. The spar section traverses at least over the slag port of the melting furnace, and at least one of the rails is a melting furnace closed dust collector (Sky House) in which the melting furnace is installed. 3. The melting furnace dismantling apparatus according to claim 2, wherein a wheel provided at a lower end of the melting furnace also serves as a running rail. 4. The melting furnace dismantling apparatus according to claim 1, further comprising: a tip cooling unit that injects air to a tip of the concrete breaker attached to a tip of the manipulator.