JPS6356285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an oxygen blowpipe used in various industries for operations such as cutting, drilling, or welding metals, as well as for refining.

(Prior Art) In various industries, especially the steel industry, a large amount of oxygen blowpipe is used for cutting metal materials and drilling holes in smelting furnaces.

For example, oxygen drilling using steel pipes has begun to be used instead of drilling holes in blast furnace tapholes, but the amount of steel pipes consumed in one drilling is extremely large. Due to the need to improve the safety of drilling operations, various studies have been carried out, and aluminum is permeated on the surface and iron is made to a thickness of approximately 0.3 to 0.8 mm.
Colorized steel pipes with an aluminum alloy layer have begun to be tested.

Figure 3 shows the steel bar 3 and the filling mat 2 that have been buried in advance in the filling mat 2 of the blast furnace taphole 1.
This is a schematic explanatory view of the operation of opening a hole while bringing an oxygen lance 4 into contact with the steel bar 3 and blowing oxygen gas to burn and melt the steel bar 3 and the filling rod 2. Reference numeral 5 indicates the wall of the blast furnace.

The oxygen lance 4 is guided by a guide device 7 having a group of guide rollers 6 so as to be movable back and forth by a drive device (not shown).

The guide device 7 is a rotating beam 10 that is rotatably supported by a bearing device 9 fixed to a structure provided around the blast furnace hearth, such as a building support column 8.
It is suspended from the tip of.

Next, the oxygen lance 4 receives a supply of oxygen gas from an oxygen supply main pipe (not shown) connected to the rear end, and is operated to spray oxygen gas from the tip onto the steel bar 3 and the mat 2. Because it constantly burns and melts and wears out quickly, colorized steel pipes, which consume less, have come to be used as oxygen lances, as mentioned above.

This colorized steel pipe has a unit length of 20 to 30 m in consideration of the wear and tear per tap hole drilling operation, and since it is hard, all straight pipes are used. Support requires a lot of manpower.

(Problems to be Solved by the Invention) The inventors of the present invention discovered that the oxygen lance has many problems in order to improve the above-mentioned tap hole drilling operation.

First, the colorized steel pipe is straight and hard, making it extremely difficult to handle.Furthermore, the amount of consumption varies widely, from 5 to 20 m per tap hole drilling operation, so one pipe is long, 20 to 30 m. The second problem is that it requires a lot of manpower to handle.The second problem is that a straight pipe section of at least 7 to 8 m is required to accurately drill a tap hole, so curved pipes are difficult to handle. It is not easy to make it more compact by adding a .

Thirdly, the difficulty of drilling the hole varies greatly depending on the furnace conditions of the blast furnace and the thermal and chemical conditions of the tap hole.If there is a large amount of wear and tear, it may be necessary to connect a calorized steel pipe midway through the process. This results in interruption of drilling work.

Part 4 is a long item as mentioned above, so keep it.
It requires a great deal of labor for transportation, installation, etc.

Now, the above-mentioned problems 1 to 4 are common problems regardless of the purpose when using a colorized steel pipe as an oxygen lance, although there may be differences in size.

(Means for Solving the Problems) Therefore, the inventors of the present invention conducted research on compacting oxygen blowing pipes using colorized steel pipes, such as the oxygen lance, and found that the starting end is wound around a winding drum so that it can be pulled out. We have succeeded in solving the above problems by developing an oxygen blowpipe made of coiled calorized steel pipe.

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

As shown in FIG. 4, the present inventors have forcibly wound a colorized steel pipe 11, which has never been wound around a drum, around a winding drum 14 consisting of flanges 12a, 12b and a winding drum 13. 1
1 was formed into a coil shape. As shown in the figure, the colorized steel pipe 11 is provided with a through hole (not shown) in the winding drum 13, and is inserted through the winding start of the colorized steel pipe 11, that is, the start end 11a, and protrudes outward from the inside of the winding drum 13 as shown in the figure. Finally, the end of the winding, that is, the terminal end 11b, is configured so that it can be held freely.

Since the starting end 11 must always be connected to an oxygen supply device, it is necessary to protrude outward as shown in FIG. 4 so that it can be connected to a fluid rotary joint (not shown). In this way, the winding drum 14
It is possible to continue supplying oxygen while rotating the calorized steel pipe 11 and unwinding it.

The starting end 11a is configured in advance as a flexible hose or flexible joint type piping and attached to the inner or outer surface of the winding drum 13 (usually a hollow cylindrical body) of the winding drum 14, and then the colorized steel pipe 11 is installed. It is also possible to perform winding by flange joining, screwing, or welding. In the present invention, including such connection and drawing means, it is defined that the starting end is wound around a winding drum so that it can be drawn out.

Now, as shown in FIG.
As a result of straightening and straightening treatment (hereinafter simply referred to as straightening) by passing the colorized steel pipe 11 pulled out from the winding drum 14 through a straightening device (hereinafter simply referred to as straightening machine) 17 consisting of 6b, the colorized steel pipe 1
New knowledge was obtained that the material No. 1 does not crack or collapse due to straightening, which was initially feared, and can be used satisfactorily as an oxygen blowpipe.

In addition, after making the steel pipe into a coil shape,
A coiled colorized steel tube that had been subjected to colorization treatment was installed on a winding drum and straightened, but it was found that it could be used without any cracks or crushing that had been feared. .

In the present invention, "winding on a winding drum" is used in both of the above meanings.

Since the oxygen blowpipe of the present invention has the above-mentioned configuration, it is compact in terms of operation and effect and is extremely economical in terms of transportation, handling, use, storage, etc. When used in drilling work, etc., it not only brings about a dramatic improvement in the efficiency of the work, but also increases the safety of the work, and the economic effects thereof are great, and will be explained in detail below using Examples.

(Example) FIG. 6 is a schematic perspective view of the taphole opening device 18, and a bearing device 21 fixed to a frame 20 of a structure near the taphole 19, such as a frame 20 of a tuyere deck, has a rotating beam. 22 is rotatably supported.

The swing beam 22 is rotated by a drive motor, for example, an air motor 23, which is fixed to the frame 20 in the same way as the bearing device 21, and a winding drum 14 and a straightener are connected to the tip of the swing beam 22 via a lifting device 24. A blowpipe feeding device 25 equipped with a blowpipe 17 is rotatably suspended.

Furthermore, a link device 26 is attached to the rotating beam 22, so that even if the rotating position of the rotating beam 22 changes, the lifting device 24 and the blowpipe feeding device 2
5 is constructed so as to always directly face the direction of the tap hole 19.

Next, the colorized steel pipe 11 is fed out from a guide 27 through a winding drum 14 and a straightener 17 so as to be able to move forward and backward, and burns and melts the steel bar 3 that has been buried in the filling mat in the tap hole 19 in advance. However, if the combustion melting slows down for some reason, and the amount of combustion melting of the steel bar 3 and the colorized steel tube 11 itself and the insertion amount of the oxygen blowpipe 11 are out of balance, the colorization will continue unless the feeding speed of the colorized steel tube 11 is slowed down. Unreasonable force is applied to the steel pipe 11, causing the oxygen blowpipe to bend or break.

In that case, the rotation speed of the pinch rolls of the straightening machine 17 should be lowered, or in some cases, the rotation speed should be reversed to wait for the combustion and melting situation to normalize. On the other hand, if the combustion and melting speed becomes faster, the colorized steel pipe 11 should be paid out. Increase speed.

It is one of the features of the present invention that the oxygen lance can be operated by winding and rewinding freely according to changes in the situation, and it is new knowledge that such operations are possible without fear of damage. be.

In FIG. 6, 28 is the take-up roller 29.
A tension wire that applies rotational force to the rotating beam 22 in the direction of the tap hole 19 by the torque air motor 30 via the rotating beam 22.
The rotation of the driving air motor 23 is stopped in the open position of the tap hole 19, and thereafter the swing beam 22 is rotated in the direction of the tap hole 19 only by the energization of the torque air motor 30. It is composed of

Next, the present inventors used coiled oxygen lances for general purpose steel pipes (JISG3421), high temperature and high pressure steel pipes (JISG3423), chemical industry steel pipes (JISG3426), and non-ferrous metals such as aluminum pipes, copper pipes, and brass pipes. I have tested all of the methods, including winding, straightening, and drilling, but I have found that all of them wear out very quickly, or are uneconomical for their purpose due to breakage, and cannot be used effectively. Experienced.

As mentioned above, the objective was achieved by using a colorized steel pipe, but the colorized steel pipe is made by burying the steel pipe in a penetrating agent and heating it to 900 to 1000 degrees Celsius in a sealed state to penetrate aluminum into the surface layer of the steel pipe. It is manufactured by forming an aluminum alloy layer and is known as a heat-resistant steel pipe, and mild steel, chrome steel, stainless steel, etc. can be used as the steel pipe material.

In addition to the structure shown in Figure 4, the structure of the oxygen blowpipe is
A suitable example is the oxygen blowpipe shown in the schematic vertical cross-sectional view of FIG. In the figure, a winding drum 34 consisting of flanges 32a, 32b with support shafts 31a, 31b and a hollow cylindrical winding drum 33 is rotatably supported by a bearing (not shown), and the colorized steel pipe 11 is arranged in multiple layers. It is wrapped. Further, the starting end 11a of the colorized steel pipe 11 is bent through a through hole 35 provided in the winding drum 33, and is connected to a fluid rotary joint 36 at a position where it exits a hollow support shaft 31b.

The fluid rotary joint 36 is connected to an oxygen supply hose (not shown).

In addition, the winding drum 33 and the flanges 32a, 32b are fixed in advance, and then the colorized steel pipe 11
It is also possible to wrap the flange 32a around the winding drum 3.
After removing the flange 32a, the colorized steel pipe 11, which has been wound in advance, is inserted into the winding drum 33, and then the flange 3
2a may also be employed, and in the present invention both are said to be wound together.

Next, FIG. 2 is a schematic vertical sectional view of an oxygen blowpipe according to a different embodiment, in which flanges 38a and 38b having support shafts 37a and 37b can be expanded and contracted in the radial direction via a slide mechanism or a link mechanism (not shown). The winding drum 40 is detachably attached to a winding drum 39, and the winding drum 40 is attached to a support column 42 erected on a frame 41 via the support shafts 37a and 37b.
a, 42b, and bearings 43a, 43b so as to be rotatable.

44 is a gear fixed to the support shaft 37b,
It meshes with a drive device such as a pinion (not shown).

A rotary joint 45 indicated by a broken line is connected to a flexible hose 46 that passes through the support shaft 37b and is fixed to the surface of the flange 38b, and the starting end of a colorized steel pipe (not shown) is connected to the flexible hose 46.

Thus, the bearing 37a, the support column 42a, and the flange 3
8a as a removable engagement mechanism, and after removing these, the winding drum 3 with a reduced diameter colorized steel pipe that has been temporarily wound into a coil shape is removed.
9, attach the flange 38a, then attach the support column 42a and the bearing 37a, and then expand the winding drum 39 to improve the contact with the colorized steel tube and smooth the extraction of the colorized steel tube. This colorized steel pipe is inserted into the winding drum 40.
It is also possible to remove the entire unit, and efficiency is further improved by preparing a number of oxygen blowing pipes made of coiled colorized steel pipes wound around a winding drum in advance, and using a so-called cartridge type in which these are replaced one after another during actual operation. However, if consumption is low, it may be more economical to insert coiled colorized steel pipes on-site.

In an example in which the oxygen blowpipe of the present invention was used to open a taphole in a blast furnace with an iron output of 10,000 tons/day, the diameter was 16 mm and the length was 16 mm.
Using a 60 to 80 m long calorized steel pipe wound around a single winding drum, the work efficiency was improved by 20 to 50% compared to using a straight calorized steel tube, and safety was improved. It has become much better, and the number of workers has also increased.
decreased by 30-40%.

(Effects of the Invention) As mentioned above, the oxygen blowpipe of the present invention is compact and easy to handle, so it not only allows for significant labor savings, but also greatly improves work efficiency and reduces expenses such as storage and transportation. I can do it.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of an oxygen blowpipe according to the present invention, FIG. 2 is a schematic vertical cross-sectional view of a different oxygen blowpipe,
Fig. 3 is a schematic explanatory diagram of a taphole opening device using a straight calorized steel pipe, Fig. 4 is a schematic front view of an oxygen blowpipe according to the present invention, and Fig. 5 is a calorized oxygen blowpipe according to the present invention. Diagram explaining the principle of straightening steel pipes, Part 6
The figure is a schematic perspective view of a blast furnace taphole opening device using an oxygen blowpipe of the present invention. 1,19...Blast furnace taphole, 2...Filling mud, 3...
Steel bar, 4, 11a...oxygen lance, 5...blast furnace wall,
6... Guide roller group, 7... Guide device, 8, 42a,
42b... Support column, 9, 21... Bearing device, 10, 2
2...Swivel beam, 11...Calorized steel pipe, 11a
...Calorized steel pipe starting end, 11b...Carolized steel pipe terminal end, 12a, 12b, 32a, 32b, 38
a, 38b...flange, 13,33,39...winding drum, 14,34,40...winding drum, 15a-1
5e... Straightening roller group, 16a, 16b... Pinch roller, 17... Straightening machine, 18... Tap hole opening device, 2
0,41...Frame, 23,30...Air motor, 24...Elevating device, 25...Blowpipe feeding device,
26... Link device, 27... Guidance guide, 28... Tension wire, 29... Winding roller, 31a, 31
b, 37a, 37b...Support shaft, 35...Through hole, 3
6, 45... Fluid rotary joint, 43a, 43b... Bearing, 44... Gear, 46... Flexible hose.

Claims (1)

[Claims] 1. An oxygen blowpipe characterized by being made of a coiled colorized steel pipe whose starting end is wound around a winding drum so that it can be pulled out.