JPH0322445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oxygen drilling device used for drilling a taphole in a blast furnace in the steel industry.

[Conventional technology]

When opening the taphole of a blast furnace using an oxygen blowpipe, an oxygen blowpipe supply device of a type in which a straight tube-shaped oxygen blowpipe is held freely by a pinch roll device is used, and the oxygen blowpipe supply device is suspended by a revolving arm. JP-A-60-135508 discloses means for advancing and retracting the iron in the direction of the tap hole.

Therefore, in order to further improve the safety of furnace front work and the efficiency of taphole opening work, the present inventors have developed the fifth
As shown in the schematic explanatory diagram of the figure, a winding drum device 2 winds a steel oxygen blowpipe 1 so that it can be freely unwound and unwound, and the oxygen blowpipe 1 wound around the winding drum device 2 is pulled out and held between the two so that it can be pulled out and retracted freely. A pinch roll device 3 and an oxygen blowpipe 1 fed from the pinch roll device 3
Bending rollers 4a to 4c that straighten the pipe into straight pipes
An oxygen blowpipe supply device 7 constituted by a frame mount 6 on which a straightening device 5 is mounted; We developed a blast furnace taphole oxygen opening machine 11 consisting of a guiding support device 10, and succeeded in greatly improving efficiency and safety.
First application filed as No. 294744.

In FIG. 5, 12 is a blast furnace, and 13 is a steel rod for drilling that is inserted into the taphole 9 in advance or remains in the tap.

Further, the support device 10 includes a link mechanism (not shown) that allows the swing arm 14 and the support bearing device 16 of the swing arm 14 fixed to the frame 15 around the furnace and the suspension device 8 to face directly to the tap hole 9. It consists of

The blast furnace taphole oxygen opening machine 11 transfers the oxygen blowpipe 1 wound around the winding drum device 2 to the pinch roll device 3.
(The drive device is not shown) is used to pull it out, push it into the bending rolls 4a to 4c and straighten it into a straight tube, and then the straight tube-shaped oxygen blowpipe 1 is brought into contact with the tap hole 9 to advance combustion opening. It is operated so as to enter the taphole 9.

When the drilling operation is completed, the swing arm 14 is operated via a drive device (not shown) to move the oxygen blowpipe supply device 7 to a position that does not interfere with the tapping operation.
However, the oxygen blowpipe supply device 7 is moved by the lifting device 8 and a link mechanism (not shown) while maintaining a posture parallel to the posture during the hole-drilling operation. In the present invention, this is referred to as being translated in parallel.

During this parallel movement, the oxygen blowpipe 1 is pulled back into the oxygen blowpipe supply device 7 by the pinch roll device 3 to an extent that does not interfere with movement, and is then rewound onto the winding drum device 2.

Since this method requires less space, it is effective in maintaining safety and efficiency of work around the taphole, which is usually very narrow and has many equipment such as matsuto guns.

Now, in the operations described above, the oxygen blowpipe 1
The drawer is pulled out and pulled back while being pinched by the pinch roll device 3, the details of which will be explained with reference to the drawings.

Therefore, the pinch roll device 3 is disclosed in Japanese Patent Application Laid-Open No. 1986-
Similar to the one disclosed in Japanese Patent No. 135508, it is constructed so that the oxygen blowpipe is held while being pressed by a spring, and the situation is shown in FIG. The pinch roll device 3 is composed of a driven roll 3a and a driving roll 3b, and the driven roll 3a is supported by a spring-type pressing support device 17 on a frame mount 6 (the whole is not shown), and is driven as shown in the figure. It rotates while being pressed in the direction of the roll 3b.

The drive roll 3b is rotated via a chain 19 by a drive motor, for example an air motor 18.

Thereupon, the oxygen blowpipe 1 moves back and forth in the direction of the taphole 9 while receiving a thrust of approximately 30 to 100 kg, for example, to perform the oxygen drilling operation.

In addition to the above-mentioned device for pinching and pressing the oxygen blowpipe 1 using the pinch roll device 3 having a spring, a device having exactly the same structure is disclosed in Japanese Patent Application Laid-open No. 87806/1983. , the device is equipped with an additional cylinder that cooperates only if the pressing force of the spring is insufficient.

When the blast furnace taphole oxygen opening machine 11 inserts the oxygen blasting pipe 1 into the taphole 9 and opens the combustion hole, a predetermined pressing force is applied to the oxygen blasting pipe 1, and the straightening device 5, the pinch roll device 3 applies a pressing force of, for example, 200 to 400 kg to the oxygen blowpipe 1 in order to straighten the oxygen blowpipe 1. Therefore, if a reaction force is generated in the oxygen blowpipe 1 in the taphole 9 for some reason, a force will be exerted to push back the oxygen blowpipe supply device 7 through the oxygen blowpipe 1, so either the insertion of the oxygen blowpipe 1 should be stopped, or Or, if the oxygen blowpipe supply device 7 is not retreated, the oxygen blowpipe 1 will buckle, making hole drilling work extremely difficult or impossible.

Now, the timing of the reaction force generated in the oxygen blowpipe 1 cannot be predicted, and its magnitude fluctuates considerably, so as a countermeasure, Japanese Patent Application Laid-Open No. 135508/1983 proposes a variable displacement piston and a relief valve. , a means using a torque motor, etc. has been proposed, and a configuration is shown in which the pinch roll device is stopped when the reaction force becomes larger than a limit, and starts operating when the reaction force becomes smaller. Therefore, the present inventors operated the driving air motor 18 of the pinch roll device 3 at a set torque to feed out the oxygen blowpipe 1 at a predetermined speed _S1 , so that the combustion consumption rate _S2 was lowered and the reaction force was reduced. When the speed exceeds the set value, the swing arm 14 is operated to retreat and the speed of the air motor 18 is reduced, and when the combustion consumption speed _S2 becomes large, the speed of the air motor 18 is increased. The reaction force was detected and controlled using a cam and a limit switch attached to the swing arm 14.

[Problem that the invention seeks to solve]

The inventors of the present invention discovered the following points that should be improved as a result of carrying out long-term tap hole oxygen hole opening work using the blast furnace taphole oxygen hole opening machine.

That is, when the aforementioned air motor for driving the pinch roll device is operated to feed out the oxygen blowpipe at a speed _S1 , when the combustion consumption rate _S2 of the oxygen blowpipe in the taphole is equal to the speed _S1 , the taphole The drilling operation is carried out at speed S ₁ . However, in order to accurately operate the swing arm 14 based on the fluctuation of the reaction force due to the change in the combustion consumption rate _S2 , and at the same time adjust the speed of the air motor 18 to an appropriate speed, considerable skill is required and adjustment is difficult. If it is inappropriate, there is a problem that a hunting phenomenon occurs.

Another factor that makes adjustment difficult is that control is often performed using a pneumatic system.

In other words, there is a high-temperature fire called the blast furnace taphole.
In addition, since oxygen gas is used in a humid atmosphere, electrical control is avoided due to concerns about accidents, and pneumatic control systems are adopted.As is well known, pneumatic control systems have a fast response time and are suitable for delicate control. Since it has unsuitable characteristics, there is a problem in that it cannot cope with the speed control described above and is likely to cause hunting phenomenon.

Furthermore, with the aim of reducing the hunting phenomenon, the present inventors suspended the oxygen blowpipe supply device 7 from a forward tilting girder 20 so as to be freely movable, as shown in FIG. The reaction force causes the oxygen blowpipe supply device 7 to
As a result of fabricating and testing a mechanism that moves smoothly forward and backward, it was surprisingly possible to move forward smoothly, but when moving backward, there was a set reaction force.
New knowledge was obtained that it requires 1.5 to 2 times more force and is extremely difficult to control.

The reason for this is not clear, but it is assumed that there are various complicated factors such as machining accuracy and lubrication.
It has been found that the above-mentioned forward-tilting girder system is not suitable for a hole-opening device that requires greater mechanical sturdiness and is subjected to severe handling under extremely adverse atmospheric conditions, and that improvements are needed.

An object of the present invention is to provide an oxygen hole-opening device that smoothly follows changes in the combustion consumption rate and hole-opening speed of an oxygen blowpipe due to various causes and realizes hole opening in a short time when opening a taphole. Another purpose is to avoid applying excessive pressure to the oxygen blowpipe that would cause it to buckle.
It is an object of the present invention to provide an oxygen hole opening device in which the oxygen blowpipe can be freely fed out and unwound, and hole opening work is easy.

[Means for solving problems]

The present invention relates to an apparatus for solving the above-mentioned problems,
The main points are a winding drum device that winds the oxygen blowpipe so that the oxygen blowpipe can be freely unwound and unwound, a pinch roll device that pinches the oxygen blowpipe so that it can be pulled out and pulled back, and a straight pipe that connects the oxygen blowpipe that is fed from the pinch roll device. an oxygen blowpipe supply device consisting of a frame mount on which a straightening roll for straightening is mounted; a suspension device that suspends the oxygen blowpipe supply device so as to be able to change its inclination angle and is equipped with rolling wheels for running a horizontal holding girder as described below; , a rotating beam that rotatably suspends a horizontal holding girder that supports the suspension device in a freely movable manner at its tip and allows the horizontal holding girder to be moved in parallel by a link mechanism; A blast furnace taphole oxygen opening device characterized by comprising a bearing device that rotatably supports a swinging beam, and a cylinder device for advancing and retreating the lifting device installed between the horizontal holding girder and the lifting device. This makes it possible to achieve the above objective.

[Effect]

The device of the present invention operates extremely smoothly because the oxygen blowpipe supply device is suspended from the horizontal holding girder via a suspension device so that it can move forward and backward in the horizontal direction while maintaining a forward tilted position, and the gravity is balanced. Can be done.

Further, a cylinder device for advancing and retracting the lifting device is installed between the horizontal holding girder and the lifting device, and mutual force transmission with the oxygen blowpipe is directly performed via the oxygen blowpipe supply device and the lifting device. Therefore, the pressing force can be adjusted quickly and accurately.

Furthermore, since the oxygen blowpipe supply device is suspended so that the angle of inclination can be changed, it is possible to change the delivery angle of the oxygen blowpipe to best suit the conditions of the taphole, thereby improving the efficiency of taphole drilling work. .

In addition, the oxygen blowpipe supply equipment is configured to be quickly parallel moved from the open hole position to the standby position by a rotating beam via a lifting device and a horizontal holding girder, allowing for safe and efficient operation. It is.

〔Example〕

Hereinafter, the oxygen hole opening device of the present invention will be explained in detail according to examples.

FIG. 1 is a schematic side view of a blast furnace taphole oxygen hole-opening device 22 (hereinafter simply referred to as hole-opening device) according to the present invention in a hole-opening position, and the oxygen blowpipe 1 is rotatably mounted on a frame mount 6. It is wound around a winding drum device 2 so that it can be freely fed out and rewinded.

The oxygen blowpipe 1 is fed out by pinch roll devices 3c and 3d, and the oxygen blowpipe 1 is moved through a straightening device 5 consisting of bending rollers 4a to 4c.
The guide tube 25 is straightened into a straight tube and fixed to a guide rack 24 having a joint fitting 23, and is inserted into a tap hole (not shown).

In the figure, 26a is a lateral guide roll of the oxygen blowpipe 1, 26b and 26c are lateral guide rolls, 26d is an upper guide roll, and 26e is a clamping guide roll.

The pinch roll devices 3c, 3d and the winding drum device 2 are driven by an air motor 27 fixed to the upper part of the frame mount 6. Reference numeral 28 is a chain wheel for power transmission, but there is also a drive chain, a sprocket wheel, etc. are omitted for convenience of explanation.

Next, the oxygen blowpipe supply device 7, which includes the frame mount 6, the first winding drum device 2 mounted on the frame mount 6, the pinch roll devices 3c, 3d, the straightening device 5, etc., is connected to the swing cylinder 2.
9. It is suspended by a suspension device 31 having a bendable arm 30 so that the angle of inclination can be changed.

The suspension device 31 is movably supported by a horizontal holding girder 32 via running wheels 33a and 33b. It is suspended in a rotatable manner.

Further, the cylinder device 35 for advancing and retracting the suspension device is attached at its base end to the horizontal holding girder 32, and its distal end cylinder rod is attached to the suspension device 31.

Therefore, the cylinder device 35 for advancing and retracting the lifting device is in an open position and presses the oxygen blowpipe supply device 7 toward the tap hole direction through the lifting device 31 at a set pressure, and the force exceeding the set reaction force is When it is transmitted through the blowpipe 1 and the oxygen blowpipe supply device 7, it operates to immediately retreat.

Now, when the hoisting device 31 is moved back and forth in the horizontal direction in this way, unless the feeding angle of the oxygen blowpipe 1 is changed each time, there will be a mismatch with the inclination angle of the taphole, which will hinder the drilling work. It can be thought of as follows. However, research conducted by the present inventors has confirmed that as long as the oxygen blowpipe 1 is inserted into the tap hole 9, there is no need to change the payout angle.

Therefore, the pressing force control of the oxygen blowpipe 1 necessary for the taphole drilling operation can be achieved by a small amount of horizontal movement of the lifting device 31, which is mechanically extremely simple, for example, within 500 mm, resulting in a fast response. Extremely quick and accurate. In addition, in the figure, 36 is a pulley used for bending the guide rack 24, which will be described later.
Reference numeral 7 indicates an air motor for driving the swing arm 14.

Next, FIG. 2 is a schematic plan view of the hole-drilling posture of the hole-drilling device 22, showing the swing arm 14 and the horizontal holding girder 3.
A link mechanism 38 is provided between the two to move the oxygen blowpipe supply device 7 in parallel to improve the efficiency and safety of the hole drilling operation.

Also, 39 is a wire used to fold the guide rack 24 in the standby position, and is installed around the blast furnace via a pulley 36 installed at the tip of the horizontal holding girder 32, a guide pulley 40 installed approximately at the center of the swing arm 14, and a wire 39 installed around the blast furnace. When the pivot arm 14 is turned to the standby position, the guide rack 24 is connected to the joint fitting 23.
It functions to bend it.

Components having the same symbols as those in FIG. 1 are the same members, so a description thereof will be omitted.

Next, referring to FIGS. 3 and 4, the hole-opening attitude and standby attitude of the hole-opening device 22 will be explained.

In the schematic side view of FIG. 3, for convenience of explanation, the standby posture is shown with a dashed line and slightly shifted to the right.

As described above, in the hole-opening position, the swing cylinder 29 is actuated, the oxygen blowpipe supply device 7 is placed in a forward tilted position, and the oxygen blowpipe 1 is paid out at an angle of inclination of the tap hole (not shown) or at an angle close to it. In the standby position, as shown at 7a, the oxygen blowpipe supply device is placed in a horizontal position, and the guide rack is bent as shown at 24a so that the tip is approximately erect so as not to interfere with other operations.

Further, as shown in the schematic plan view of FIG. 4, the oxygen blowpipe supply device 7 is moved in parallel by the link mechanism 38 until it reaches the standby position 7a shown by the dashed line, so that it can be moved between the standby position and the opening position. It is extremely smooth and can be moved safely and quickly even around the blast furnace taphole, which is normally extremely narrow due to the large number of devices.

〔Effect of the invention〕

The device of the present invention can quickly respond to changes in the combustion consumption rate of the oxygen blowpipe, can open holes while always maintaining an appropriate pressing force, and has a simple mechanism with extremely few failures. Its practical effects are enormous.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a blast furnace taphole oxygen opening device according to the present invention, FIG. 2 is a schematic plan view thereof, and FIG.
FIG. 4 shows a schematic side view and a plan view for explaining the hole-drilling attitude and the standby attitude of the hole-drilling device. Fig. 5 is a schematic explanatory diagram of the blast furnace taphole oxygen opening device according to the earlier application, Fig. 6 is a schematic explanatory diagram of the operating status of the pinch roll device, and Fig. 7 is the blast furnace taphole oxygen according to the forward tilting girder system. FIG. 2 is a schematic explanatory diagram of a hole punching device. [Explanation of symbols], 1... Oxygen blowpipe, 2... Winding drum device, 3... Pinch roll device, 3a...
Driven roll, 3b... Drive roll, 3c, 3d...
... Pinch roll device, 4a to 4c... Bending roller, 5... Straightening device, 6... Frame mount, 7... Oxygen blowpipe supply device, 8... Lifting device,
9...Taphole, 10...Support device, 11...Blast furnace taphole oxygen opening machine, 12...Blast furnace, 13...Steel rod, 14...Swivel arm, 15...Structure, 16
... Bearing device, 17 ... Spring type press support device, 18 ... Air motor, 19 ... Chain,
20...Forward tilting girder, 21...Balance air cylinder, 22...Blast furnace taphole oxygen opening device,
23...Joint fittings, 24...Guide rack, 25
... Guide tube, 26a, 26b, 26c ... Lateral guide roll, 26d ... Upper guide roll, 2
6e... Holding guide roll, 27... Air motor, 28... Chain wheel, 29... Swing cylinder, 30... Flexible arm, 31
... Hanging device, 32 ... Horizontal holding girder, 33
a, 33b...Traveling wheel, 34...Rotating hanging tool,
35... Cylinder device for advancing and retreating the lifting device, 36...
...Pulley, 37...Drive air motor, 38...
Link mechanism, 39...wire, 40...guide pulley, 41...framework, 42...fastener.

Claims (1)

[Claims] 1. A winding drum device for winding the oxygen blowpipe so that the oxygen blowpipe can be freely unwound and unwound; a pinch roll device that pinches the oxygen blowpipe so that the oxygen blowpipe can be freely drawn out and pulled back; and a straightening roll that straightens the oxygen blowpipe fed from the pinch roll device into a straight pipe. an oxygen blowpipe supply device consisting of a frame mount on which the oxygen blowpipe supply device is mounted; a suspension device that suspends the oxygen blowpipe supply device so as to be able to change its inclination angle and is equipped with rolling wheels for running a horizontal holding girder, which will be described later; A rotating beam that rotatably suspends a horizontal holding girder that supports a holding device in a freely movable manner and moves the horizontal holding girder in parallel using a link mechanism; A blast furnace taphole oxygen opening device comprising a bearing device that supports the shaft, and a cylinder device for advancing and retreating the lifting device installed between the horizontal holding girder and the lifting device.