JPH0318494Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oxygen drilling device used for drilling a taphole in a blast furnace in the steel industry.

[Conventional technology]

As is well known, air drills were often used to open the tapholes of blast furnaces, but in order to improve productivity by shortening the tapping time and reduce maintenance costs, an oxygen blowpipe was used to drill the tapholes. A device has been developed and put into practical use that melts and burns a closed muzzle at the taphole and a steel rod for opening the hole that has been buried in the closed muzzle in advance by blowing oxygen gas onto the taphole.

For example, in Japanese Patent Application Laid-Open No. 60-135508,
As shown in the figure, the oxygen blowpipe 1 is held between a pinch roller device 4 consisting of a holding roller 2 and a drive roller 3, and the oxygen blowpipe 1 is inserted into the tap hole 5 while the pressing force is controlled. ) has been disclosed.

By the way, since the device A uses a long straight oxygen blowing tube, for example, a long oxygen blowing tube measuring 30 to 40 m, the oxygen blowing tube is coiled and the oxygen blowing tube is straightened into a straight tube shape before use. A hole punching device (hereinafter referred to as B device) that feeds the hole in the direction of the pig hole was developed and filed by the present applicant as Utility Model Application No. 119682/1982.

FIG. 8 is a schematic plan view of the B device 6, in which an oxygen blowpipe 1 is attached to a coil at the tip of a swing arm 9 that is rotatably operated via a swing drive device 8 fixed to a structure 7 around the blast furnace. A winding drum device 10 wound into a shape, a pinch roller device, and an oxygen blowpipe supply device 11 equipped with a straightening device (both not shown) are rotatably suspended.

FIG. 8 shows the hole-drilling operation, and when the hole-drilling operation is completed, the swing arm 9 is driven, and in this example, the swing arm 9 is driven.
Turn it 180 degrees and move it to the standby position.

When opening the hole, the oxygen blowpipe supply device 11
The oxygen blowpipe 1 is continuously straightened into a straight pipe shape and fed out from the tap hole 5, and then inserted after coming into contact with the tap hole 5.
The wood and/or steel rods filled in the pipe are burned and melted. For convenience of explanation, the explanation of the oxygen gas supply device and the drive device will be omitted.

Therefore, the oxygen blowpipe 1 described above uses a steel pipe with a relatively small diameter, for example, about 10A (refer to JIS G3452 carbon steel pipes for piping), or a colorized steel pipe obtained by colorizing them. The distance between the holes must be at least 3 to 4 meters due to equipment or operational constraints, and some kind of guide device is required to bring the oxygen blowpipe 1 into accurate contact with the tap hole 5. must be established.

Therefore, the device B is provided with a short guide pipe 12 on the exit side of the pinch roller device to guide the oxygen blowpipe toward the tap hole.

As the guide device, in addition to the short guide tube 12, a guide frame that can move forward and backward is provided, and a device to avoid buckling or bending of the oxygen blowpipe by using a long guide tube has been developed and separately proposed by the present applicant. An application has been filed.

[Problem that the invention attempts to solve]

As a result of long-term drilling of blast furnace tapholes using the above-mentioned oxygen hole-opening device, the inventors of the present invention discovered that when the hole was opened, melted pig iron, slag, etc. (containing molten matter) spews out violently, scattering onto the winding drum device and straightening device, and some of it sticks to the device, making it difficult to operate the device, causing damage to equipment, and posing a safety risk to workers. It turned out to be a problem.

The present invention provides a blast furnace taphole oxygen opening device that does not cause damage to equipment due to flying pig iron (a general term for melted materials such as the aforementioned pig iron, slag, blowpipe, and mud) and poses no danger to workers. The purpose is to

[Means for solving problems]

In order to achieve the above object, the present inventors straightened the oxygen blowpipe wound on a winding drum device installed in the winding drum device into a straight tube shape through a pinch roller device and a straightening device, and then took the oxygen blowpipe out through a guide device for the oxygen blowpipe. An oxygen blowpipe supply device that feeds out and unwinds in the direction of the pig hole, and the oxygen blowpipe supply device is suspended via a suspension device so as to be rotatable in the horizontal direction and can freely change the tilt angle, and the oxygen blowpipe supply device is opened. A blast furnace taphole oxygen opening device comprising a supporting device movably supported between a hole position and a standby position, the blast furnace having a heat-resistant shield for preventing flying pig iron on the opposite side of the taphole of the oxygen blowpipe supply device. We developed a taphole oxygen supply system, solved the problems, and succeeded in achieving our goals.

[Effect]

The blast furnace taphole oxygen supply device (hereinafter simply referred to as the hole punching device) of the present invention has a heat-resistant shield (hereinafter simply referred to as the heat-resistant shield) for preventing flying iron on the side facing the taphole of the oxygen blowpipe supply device.
Because of this, even if severe flying pig iron is scattered during oxygen hole drilling work, the flying pig iron will not collide with or adhere to the winding drum or pinch roller device, and equipment damage will not occur. In addition, it is possible to avoid injury to workers caused by flying pig iron.

In addition, since the oxygen blowpipe supply device is protected from radiant heat from the taphole and high-temperature objects near the taphole by the heat-resistant shield, the oxygen blowpipe supply device can be moved close to the taphole and removed from the taphole. This makes it possible to accurately abut and insert the oxygen blowpipe into the hole, thereby improving hole-opening efficiency.

Furthermore, in cases where the surface of the heat-resistant shield, that is, the surface on the side from which the flying pig iron flies, is equipped with hardware for adhesion of flying pig iron, a self-coating layer with heat insulation and impact resistance is formed by the adhesion and solidification of the flying pig iron. This makes it possible to perform heat insulation and mechanical protection functions.

〔Example〕

FIG. 1 shows a schematic side view of a blast furnace taphole oxygen opening device (hereinafter simply referred to as the hole opening device) 13 according to the present invention. In the figure, a horizontal holding girder 14 is rotatably suspended from the tip of the swing arm 9 via a pivot device 15.

The running beam 16 is movably mounted on the horizontal holding beam 14 via wheels 17a and 17b, and is configured to move back and forth by an air cylinder (not shown).

The traveling beam 16 also includes a suspension arm 18,
Oxygen blowpipe supply device 1 via liftable arm 19
It is possible to suspend the oxygen blowpipe 1 at a freely tilted angle and adjust its posture so that the oxygen blowpipe 1 accurately contacts the tap hole 5.

The oxygen blowpipe supply device 11 includes pinch rollers 20a and 20b in addition to the winding drum device 10.
A pinch roller device 21 consisting of a straightening device 23 consisting of bending rollers 22a to 22c and guide rollers 24 to 26 are mounted, and the oxygen blowpipe 1 is pulled out from the winding drum device 10 by the pinch roller device 21. After being straightened into a straight tube shape by the straightening device 23, it is fed out through guide rollers 24 and 25 from a guide beam 29, which will be described later, in the direction of the tap hole.

Reference numeral 27 represents a driving motor for the winding drum device 10 and the pinch roller device 21, such as an air motor, and 28 represents a sprocket wheel. For convenience of explanation, power transmission chains, belts, etc., oxygen gas supply devices, air piping, etc. are not shown.

Next, a blowpipe guide straight pipe 30 is fixed to the tip of the guide beam 29, and the guide beam 29 has a hinge mechanism 31 in a portion close to the oxygen blowpipe supply device 11, and an air tube that is engaged with the hinge mechanism 31. It is equipped with a levitation device 32 consisting of a cylinder.

Reference numeral 33 is a heat-resistant shield for preventing flying iron (hereinafter simply referred to as heat-resistant shield) fixed to the side facing the taphole of the oxygen blowpipe supply device 11, and the details of the structure will be described later.

Now, FIG. 2 is a schematic diagram showing the situation in which the taphole 5 is opened using such a hole-opening device 13, and when the oxygen blowpipe 1 is inserted into the taphole 5 and oxygen gas is injected. A large amount of flying pig iron 34 is ejected from the taphole 5, collides with various parts of the hole-drilling device 13, and scatters, but some of it adheres to all the constituent members.

If such flying pig iron 34 adheres to operating members such as the pinch roller device 4 and the straightening device 23, or to the winding drum device 10 of the oxygen blowpipe 1, it will not only cause a malfunction, but also cause the flying pig iron 34 to become difficult to operate. There is a risk of injury to others as well. Therefore, if the heat-resistant shield 33 is provided on the front side of the oxygen blowpipe supply device 11, that is, on the side facing the taphole, most of the flying pig iron 34 will be transferred to the heat-resistant shield 33.
This eliminates the risk of collision and scattering, bouncing back toward the tap hole and causing harm.

According to the experience of the inventors of the present invention, some of the flying pig iron 34 has components that are very likely to adhere to the heat shield 33 during a collision, and a large amount of these components adhere to the heat shield 33. Therefore, the present inventors fixed a metal fitting 35 for attaching flying pig iron made of expanded metal, punched iron plate, wire mesh, etc. to the surface of a heat-resistant shield 33 whose main component is a flat iron plate, and the flying pig iron 34 was attached in a layered manner. It was able to perform heat insulation and mechanical protection functions, reducing damage to equipment and successfully extending the lifespan of the heat shield 33.

The thickness of the self-coating layer formed by the flying pig iron 34 reaches 30 to 50 mm, but if it becomes too thick, it becomes an obstacle to the operation of the guide beam 29, the undulating device 32, etc. In this case, the extra coating layer is removed by hitting with a hammer or the like, and this removal operation can be performed relatively easily and there is no risk of damaging other parts of the drilling device 13.

Next, FIG. 3 is a schematic diagram showing the situation in which the hole-drilling device 13 is moved to the standby position by the swivel arm 9 after the hole-drilling operation is completed, and the guide beam 29 is placed in an upright position by the hoisting device 32 and is moved. The structure is designed to prevent accidents such as damage due to collision with other equipment. In this case, the guide beam 29
The blowpipe guide straight pipe 30 and the heat-resistant shield 33 must be designed so that they do not interfere with each other in consideration of the formation of the self-coating layer.

Next, the details of the heat-resistant shield 33 are shown in the front view in Fig. 4 and in Fig. 5.
The explanation will be made according to the side view of the figure and the partially enlarged view of FIG. The heat-resistant shield 33 in this example is the upper frame 11a and the lower frame 11 of the oxygen blowpipe supply device 11.
A flat steel plate 36 stretched between b and an expanded metal 35a bolted to the surface of the flat steel plate 36.
A lower heat-resistant shield 33a consisting of a lower heat-resistant shield 33a, an L-shaped overhanging frame 37 welded to the flat steel plate 36, a flat steel plate 38 erected on the frame 37, and the flat steel plate 38
Expanded metal 3 bolted to the surface of
The upper heat-resistant shield 33b consists of 5b.

39a to 39c are reinforcing support plates,
Through holes 40a and 40b shown in the front view of FIG. 4 are openings for the guide beam 29 to protrude from, and 41 represents an opening for the oxygen blowpipe 1 to protrude from.

[Effect of idea]

The hole drilling device of the present invention does not cause failures due to flying pig iron, so the operating rate of the equipment is high, and the equipment life is long due to the thermal and mechanical protection effect of the heat shield, so it contributes to productivity improvement. This is a very useful device in practice.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the blast furnace taphole oxygen hole opening device according to the present invention, Fig. 2 is a schematic explanatory diagram of the hole drilling operation, and Fig. 3 is a schematic illustration of the hole opening device immediately before moving to the standby position. 4 is a front view of the heat shield according to the present invention, FIG. 5 is a side view thereof, FIG. 6 is a partially enlarged view of the vicinity of the reinforcing support plate, and FIG. 7 is a schematic explanation of a conventional hole punching device. FIG. 8 is a schematic plan view of the hole punching device according to the prior application. Explanation of symbols, 1...Oxygen blowpipe, 2...Press roller, 3...Drive roller, 4...Pinch roller device, 5...Taphole, 6...Drilling device, 7...Framework, 8 ...Swivel drive device, 9...Swivel arm, 1
0... Winding drum device, 11... Oxygen blowpipe supply device, 12... Short guide tube, 13... Blast furnace taphole oxygen opening device, 14... Horizontal holding girder, 15...
... Pivot support device, 16... Traveling beam, 17a, 17
b... Rolling wheel, 18... Hanging arm, 19... Liftable arm, 20a, 20b... Pinch roller,
21... Pinch roller device, 22a to 22c...
Bending roller, 23... Straightening device, 24~
26... Guide roller, 27... Air motor,
28... Sprocket wheel, 29... Guide beam, 30... Blowpipe guide straight pipe, 31... Hinge mechanism, 32... Lifting device, 33... Heat resistant shield for preventing flying pig iron, 33a... Lower heat shield, 33b ... Upper heat shield, 34 ... Flying pig iron, 35 ... Hardware for attaching flying pig iron, 3
5a, 35b...expanded metal, 36...
Flat steel plate, 37... L-shaped overhang frame, 38...
Flat steel plate, 39a to 39c...Reinforcement support plate, 40
a, 40b... through hole, 41... through hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Straightening the oxygen blowpipe wound on a winding drum device installed in the winding drum device into a straight tube shape through a pinch roller device and a straightening device, and then tapping the oxygen blowpipe through a guide device. An oxygen blowpipe supply device that feeds out and rewinds in the mouth direction, and a suspension device that suspends the oxygen blowpipe supply device so as to be rotatable in the horizontal direction and whose inclination angle can be varied, and an opening position of the oxygen blowpipe supply device. and a support device movably supported between standby positions, the blast furnace taphole oxygen opening device comprising a support device movably supported between a standby position and a blast furnace taphole oxygen opening device, the blast furnace taphole oxygen hole opening device comprising a support device movably supported between a standby position and a blast furnace taphole oxygen hole opening device comprising a heat shield for preventing flying pig iron on the opposite side of the taphole of the oxygen blowpipe supply device. Mouth oxygen opening device. (2) The blast furnace taphole oxygen opening device according to claim 1, wherein the heat-resistant shield for preventing flying pig iron is provided with hardware for adhesion of flying pig iron on its surface.