JPS6360084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an apparatus for opening a tap hole in a blast furnace using oxygen gas.

(Prior technology) The tap hole of a blast furnace is a facility in which the hole is opened 8 to 10 times on a normal day and then closed with mud after tapping, and the tap hole is operated in a high temperature and dusty working atmosphere. This required a great deal of work time and manpower, as it was not easy to drill holes in the plugging material that had hardened under high heat.

Therefore, many attempts at mechanization have been proposed with the aim of improving work efficiency and saving labor.

For example, Japanese Patent Application Laid-Open No. 53-54103 discloses a means for opening a hole by irradiating a laser into a closed taphole, and Japanese Patent Application Laid-Open No. 58-39711 discloses
Immediately after the taphole is closed by the matud, with only the vicinity of the inner end surface of the matud having been fired, the matudo gun is removed, and the taphole opening machine inserts a round steel bar into the matudo to open the taphole. A method is shown in which the machine is evacuated and only the round steel bar is left in the mound, and after the mound is fired and hardened, the round steel bar is pulled out and a tap hole is opened when necessary.

Furthermore, in Japanese Patent Publication No. 58-189311, in a method of opening the tap hole by irradiating a laser to the plugged mat of the blast furnace taphole, when closing the taphole after the completion of tapping of the blast furnace, the blockage refractory A material that is easily vaporized by combustion is filled in advance in the material, and the next time the iron is tapped, the blocked taphole is irradiated with a laser and auxiliary gas for combustion of the easily vaporized material is simultaneously injected. , discloses means for smoothly opening the blocked tap hole by combusting and vaporizing the easily vaporized substance in the tap hole.

In addition, the present inventors previously invented a taphole opening machine shown in FIG. 7 and filed an application for the same.

The main feature of this drilling machine is to use an oxygen lance delivery device 5 which faces the tap hole 2 of the blast furnace 1 and holds a straight tube-shaped oxygen lance 4 so as to be freely delivered, and 6 is a driving motor such as an air motor 6a. An oxygen lance gripping roller 7 rotatably driven by a rotary arm 8 is engaged with the oxygen lance delivery device 5 by a rod rotatably suspended by a pivot arm 8.
The swing arm 8 is mounted on a bearing device 10 fixed to a frame 9 and is rotatably driven by a rotation motor, such as an air motor 11, so that the oxygen lance 4 is positioned so as to directly face the tap hole 2.

The steel rod 3 and plugging material 3a remained in the taphole or were buried in advance.
The steel rod 3 and The hole is opened while burning and melting the plugging material.

(Problems to be Solved by the Invention) As a result of trying to develop a blast furnace taphole opening device as described above, the present inventors found that there were still some problems left with the conventional means. Ivy.

That is, the invention described in JP-A No. 53-54103 (hereinafter referred to as invention A) requires a considerably high equipment cost and requires a tap hole with a predetermined hole diameter and a straight axis. Technical problems remain in drilling a round steel bar left in a closed mud, and in the invention described in JP-A-58-39711 (hereinafter referred to as the B invention), when pulling out a round steel bar left in a closed mud, The steel bar tends to break off and remain in the closed rod, and in that case, it becomes necessary to manually blow oxygen gas onto the remaining round steel bar using an oxygen gas blowpipe to melt and remove it, which actually reduces the time required for opening the hole. There is a problem in that it tends to become long.

Furthermore, the invention described in Japanese Patent Application Laid-Open No. 58-189311 (hereinafter referred to as the C invention) has the same problems as the A invention that the equipment cost is quite high and maintenance is not easy. Technical challenges remain, such as the hole probe being easily damaged due to high heat and requiring extremely sophisticated techniques to operate.

Furthermore, in the taphole opening machine explained in Fig. 7, 20
Since a straight tube-shaped oxygen lance with a length of ~30 m is used, a large amount of manpower is required to set the oxygen lance 4 in the oxygen lance feeding device 5 or to manually hold the rear end portion of the oxygen lance 4. Since connecting, transporting, storing, etc. the oxygen lance 4 requires a lot of work time, there is a demand for labor saving and improved work safety, although the hole drilling work itself is efficient.

As explained above, technical problems remain with the inventions A, B, and C, and improvements are considered necessary.

As mentioned above, blast furnace taphole opening equipment is used in high-temperature, dusty, and usually cramped work environments, so it is simple, easy to operate, compact, and less likely to break down. Although it is desirable to have a device that can be operated efficiently by a small number of people, is safe, and does not require much maintenance and maintenance costs, no device has yet been provided that satisfies these requirements.

(Means for solving the problem) Therefore, as a result of long-term research, the present inventors found that
A blast furnace taphole in which a consumable oxygen lance is brought into contact with a steel rod that has been buried in a taphole plug in advance, and oxygen gas is injected to melt the steel rod and the consumable oxygen lance while opening the taphole. An oxygen lance feeding device which is a hole punching device and includes an expendable oxygen lance wound around a winding drum and a straight feeding device for the expendable oxygen lance; the oxygen lance feeding device is rotatable and movable. a swinging arm suspended from the shaft and rotatably supported by a structure near the taphole; a pushing force applying device that always applies a set pushing force in the direction of the taphole to the swinging arm; a clutch mechanism with a return device that separates the swing arm from the rotation mechanism in a posture and makes it freely rotatable; We have succeeded in solving the above-mentioned problems by developing a blast furnace taphole opening device characterized by comprising a device for adjusting the feeding speed of the straight feeding device of the consumable oxygen lance.

(Function) The structure and function of the present invention will be explained below with reference to the drawings.

FIG. 2 is a schematic explanatory diagram showing the main structure of the hole-opening device according to the present invention.
2 is wound around a winding drum 14 which is rotatably supported by an oxygen lance feeding device 13, and is straightened and straightened by a straightening feeding device 15.
It is paid out in the direction of the tap hole 17 of 6.

Reference numeral 18 indicates a steel rod that was cut and remained in the taphole during the extraction operation, or was buried in advance, and since the shapes of the two existing in the taphole are almost the same, the present invention In this case, both are considered to be the same steel rod, and in that sense, they are defined as "pre-buried steel rods."

Next, reference numeral 19 is a flexible hose for oxygen supply, which is connected to the oxygen supply device 20, and the flexible hose 19 is a consumable oxygen lance that is wound around the winding drum 14 via a swivel joint (not shown). 12 (hereinafter simply referred to as oxygen lance)
It is connected to the.

The swing arm 21 rotatably suspends the oxygen lance delivery device 13 via a suspension rod 22, and is further mounted on a bearing device 24 fixed to a frame 23 such as a pillar, beam, or deck around the blast furnace. It is supported on a shaft and is rotatably driven by a driving motor such as an air motor 25. In the present invention, this means that the swing arm is rotatably supported by the structure. Next, 26 is a clutch mechanism with a return device which will be described in detail later, and the rotating arm 2
1 from the rotating mechanism mainly composed of the air motor 25, and allows the rotating arm 21 to rotate freely. Reference numeral 27 denotes a pressing force applying device having a tension wire 28 which has one end locked to the rotating arm 21 and the other end wound around a rotary drum (not shown) so as to be freely wound and unwound.

Next, FIG. 3 shows an outline of the structure of the oxygen lance feeding device 13 and the straightening feeding device 15.

The oxygen lance 12 is passed from the winding drum 14 through a horizontal guide roll 29 to an air motor 3 for driving.
A feeding force is applied by a feeding roller 30 whose rotational speed is variable and which is driven in a forward and reverse direction by a motor 0a. 31a to 31d are straightening roller groups, and the oxygen lance 12 is straightened while passing through the roller groups 31a to 31d, and is fed out from the guide 32 in the direction of the tap hole. 33 is a shaft that supports the entire oxygen lance feeding device 13, and is pivotally supported by the suspension rod 22. The frame 34 has an angle changing device (not shown) and has a function of changing the elevation angle of the oxygen lance feeding device 13 with respect to the shaft 33, and therefore adjusts the inclination angle of the oxygen lance 12 and performs hole drilling operation. Although it is intended to make it easier, it is free to provide such a mechanism as appropriate.

Next, FIG. 1 is a schematic perspective view of a blast furnace taphole opening device according to the present invention, and the same reference numerals as in FIGS. 2 and 3 are the same members.

Now, it is difficult to install the taphole opening device directly facing the taphole 17 due to its relationship with the furnace front work and many work devices, and the oxygen lance 12 is normally only used during hole opening work. It is necessary to directly face the pigtail hole 17. Therefore, a bearing device 24 and an air motor 25 are fixed to a suitable structure 23 such as a tuyere deck around the taphole, and the swing arm 2 is attached to the bearing device 24.
1 is rotatably attached to the shaft, and an oxygen lance feeding device 13 is rotatably suspended from the tip thereof by a suspension rod 22.

The oxygen lance feeding device 13 and the rotating arm 2
For example, a parallel link device 37 is interposed between 1 and 2, so even if the swing arm 21 rotates,
The oxygen lance 12 is oriented in the direction of the tap hole 17.

Now, when the swing arm 21 is rotated from the standby position and reaches the hole opening preparation position and touches a stopper (not shown), the clutch mechanism 26 with a return device, for example, an air clutch, is activated and the swing arm 21
is rotatable, but the rotating arm 21 has a pressing force that is always set to face the tap hole direction, for example.
A force from a pressing force applying device 27 applying 20-30 kg is applied through a pull wire 28. 2
7a is a one-way torque motor, and 35 is a rotating drum of the tension wire 28.

On the other hand, the oxygen lance 12 is operated by a feeding roller operated by an air motor (not shown).
Since it is delivered with a force of 300 kg, the oxygen lance 12
The steel rod 18 is combusted and melted by the ejected oxygen gas, and the steel rod 18 is thrust into the tap hole 17 and the hole is opened.

Therefore, while the feeding of the oxygen lance 12 and the melting and disappearance are in balance, the oxygen lance 12 is always pushed with a constant force in the direction of the tap hole by the force of the one-way torque motor 27a, and the drilling operation is performed smoothly. However, if the melting speed slows down for some reason during this hole-opening operation, a repulsive force proportional to the feeding force applied to the oxygen lance 12 via the feeding roller 30 will occur, and the repulsive force will exceed the setting described above. If the pressing force is exceeded, the pivot arm 21 will retreat.
At this time, if the rotation of the swing arm 21 in the backward direction is detected and the rotational speed of the air motor 30a for feeding out the oxygen lance 12 is reduced to balance the melting speed and the feeding speed, unreasonable force is not applied to the oxygen lance 12. Therefore, there is no possibility that an accident such as the oxygen lance 12 being bent or broken occurs.

Next, when the melting speed increases and exceeds the feeding speed of the oxygen lance 12, the swing arm 21 rotates toward the tap hole due to the set pressing force, and as a result, the air motor 30 for driving the feeding roller is rotated.
The supply amount of the actuating air (a) is changed, the rotational speed is restored, the feeding speed of the oxygen lance 12 becomes faster, and the drilling operation progresses.

In FIG. 1, 36 is a bearing of the winding drum 14, and 37 is a bearing between the rotating arm 21 and the oxygen lance feeding device 13 in order to make the oxygen lance feeding device 13 directly face the two directions of the tap hole, as described above. This is a link rod provided between the two, and the illustration of the link arm and the like is omitted.

Next, FIG. 4 shows a schematic top view of the taphole opening device according to the present invention, and FIG. 5 shows a schematic side view thereof, in which the same symbols as in FIGS. 1 to 3 indicate the same members. Therefore, the explanation will be omitted.

(Example) As mentioned above, the apparatus of the present invention is equipped with a mechanism for automatically maintaining a good melting state at all times, and this mechanism will be explained in more detail with reference to FIG. 6.

FIG. 6 is an explanatory diagram of the principle of the mechanism, in which the rotating arm 21 is always connected to the tension wire 28 and the rotating drum 3.
5. As described above, it is operated in the tap hole direction by the pressing force applying device 27 consisting of the one-way torque motor 27a.

A gear 38 operated by the air motor 25 meshes with a gear 39 fixed to the rotating shaft of the swing arm 21, so that the swing arm 21 is rotatably operated by the air motor 25. is configured to come into contact with the stopper 44 when the hole-opening operation position is reached, and this contact activates the clutch mechanism 26, e.g., an air clutch, and the gear 38 is disengaged from the air motor 25. .

Next, as described above, when the swing arm 21 turns in the opposite direction due to the repulsive force transmitted through the oxygen lance, the rotation is transmitted to the gear 40 that meshes with the gear 39, and is locked to the gear 40. The cam 41 rotates, the cushion valve 42 operates, and the amount of compressed air sent to the aforementioned air motor 30a for driving the delivery roller is automatically adjusted in accordance with the amount of rotation of the swing arm 21. As a result, the air motor 3
At 0a, the rotational speed is slow or the rotational speed is stopped, so from then on, the pressing force applying device 27 is mainly used.
As the pressing force of is applied to the swing arm 21,
Until the molten state improves, no force is applied to the oxygen lance 12 that would cause it to bend or break.

Furthermore, in order to return the swing arm 21 to the standby position, a return device (not shown) supplies compressed air to the clutch mechanism 26, such as an air clutch, to restore engagement.

Further, the forward and reverse rotation of the air motor 30a for driving the feeding roller 30 is performed by remotely operating the switching valve 43. For example, forward rotation (feeding) in line 45a and reverse rotation (rewinding) in line 45b.
It is operated as follows.

The above-mentioned device is not limited to this example, and may be replaced with a member having the same function and action within a free range of design discretion without departing from the purpose.

Accordingly, in the present invention, a device having the above-mentioned effect is provided.
It is referred to as a device that adjusts the feeding speed of the straightening device for feeding out the consumable oxygen lance in conjunction with the rotating arm that rotates in response to an increase or decrease in the repulsive force applied to the consumable oxygen lance during melting. and,
Although it is possible to perform the above-described operations and functions of the present invention using an electrical device, a mechanically operated device that uses compressed air as in this example of the present invention can generate high heat and dust. There are no accidents such as fires in the atmosphere, and maintenance and inspection are safe, with fewer breakdowns.

(Effects of the Invention) According to the present invention, a long oxygen lance is wound around a winding drum and can be unwound to a desired length according to the amount of consumption without any manual effort. The lance is always fed out in accordance with the optimal melting conditions, and no excessive force is applied to the oxygen lance, such as bending or breaking it, allowing for safe and efficient drilling work and remote control. Therefore, the labor-saving effect is outstanding and the practical value is extremely large.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of the device of the present invention;
The figure is a schematic explanatory diagram showing the main configuration of the device of the present invention, FIG. 3 is a schematic explanatory diagram of the structure of the oxygen lance delivery device, and FIG. 4 is a schematic top view of the device according to the present invention.
FIG. 5 is a schematic side view thereof, FIG. 6 is a schematic explanatory diagram of the operation of the rotating arm, and FIG. 7 is a schematic explanatory diagram of a tap hole opening device using a straight pipe oxygen lance. 1,16...Blast furnace, 2,17...Tackle mouth, 3,18
...Steel rod, 4...Oxygen lance, 5, 13...Oxygen lance feeding device, 6...Oxygen lance gripping roller, 6
a, 11, 25, 30a...Air motor, 7, 2
2... Hanging rod, 8, 21... Swivel arm, 9, 2
3... Frame, 10, 24... Bearing device, 12... Consumable oxygen lance, 14... Winding drum, 15... Straightening and feeding device, 19... Flexible hose, 20...
Oxygen supply device, 26...Clutch mechanism, 27...Pushing force applying device, 28...Tension wire, 29...Horizontal guide roll, 30...Feeding roller, 31a~
31d... straightening roller group, 32... guidance guide, 3
3...Axis, 34...Frame, 35...Rotating drum, 3
6... Bearing, 37... Link rod, 38, 39,
40...Gear, 41...Cam, 42...Cushion valve,
43...Switching valve, 44...Stopper.

Claims (1)

[Claims] 1. Blast furnace tapping, in which a consumable oxygen lance is brought into contact with a steel rod that has been buried in the taphole plugging material in advance, and oxygen gas is injected to melt the steel rod and the consumable oxygen lance while opening the taphole. An oxygen lance feeding device which is a mouth opening device and includes an expendable oxygen lance wound around a winding drum and a straightening device for feeding out the expendable oxygen lance; rotating and moving the oxygen lance feeding device; a swing arm that is freely suspended and rotatably supported by a structure near the tap hole;
a pressing force applying device that always applies a set pressing force in the direction of the tap hole to the swinging arm; a clutch mechanism with a return device that disconnects the swinging arm from the swinging mechanism in the hole-opening operation position and makes it freely rotatable; and a device that adjusts the feeding speed of the straightening feeding device for the expendable oxygen lance in conjunction with the rotating arm that rotates in response to an increase or decrease in the repulsive force applied to the expendable oxygen lance during melting. Features: Blast furnace taphole opening device.