JPS6130003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide an improved construction device for constructing the lining of a refining furnace and a molten metal container, especially a converter, using a monolithic refractory for pouring. That is.

Conventionally, the linings of converters, ladles, etc. were generally constructed with various types of refractory bricks, but for several years now, so-called unstable-shaped bricks have been promoted from the viewpoint of labor-saving, speedy, and energy-saving construction. As already described in Japanese Patent Publication No. 48-40522, large cylindrical inner frames (construction frames) are stacked one after another from below inside the steel shell, and a vertically movable structure is inserted into the steel shell from above. There is a method for constructing refractory linings for converters in which the stamping material is filled into the gaps using a stamping device installed on the hanging support, but in practice it is not possible to construct the bottom of the furnace, and the inner frame is The installation work is complicated and the stamping work requires skill, and it also has drawbacks such as "uneven tightness" which makes it difficult to install an even lining.

On the other hand, construction methods in which castable or other unshaped refractories are poured into the gap between the construction frame attached to the steel shell and filled and hardened can generally provide a more uniform lining more easily than the stamp construction method. Recently, it has been considered to apply this to the lining construction of converters, and it has already been expanded by pasting an airtight rubber layer on the front and back sides and pressurizing air, as described in Japanese Patent Application Laid-Open No. 53-4711. There is a core device for constructing monolithic refractories for containers, whose main part is a flexible core (inner frame) made of canvas whose shape matches the inner surface shape of the lining of converters, etc. , it is difficult to install the bottom of the furnace (actually, it needs to be installed separately in advance), and it is also difficult to install a vibrating device or heating device on the inner frame, so the packing density is high and it is difficult to install an even lining. Moreover, there are disadvantages such as longer construction time and longer construction period. In addition, a technology that can be used is as described in Japanese Patent Application Laid-Open No. 52-9605, in which large hollow truncated right conical inner frames, which are fabricated in advance in several blocks in the height direction, are stacked one after another from the bottom. There is a blast furnace lining construction method that involves installing and filling the gap with monolithic refractories.
Compared to blast furnaces, the use of so-called disposable construction frames for converters, which require repeated relining, increases construction costs and makes installation to the steel shell complicated, making it impractical. There are drawbacks such as not being

The present invention is a converter lining pouring construction device completed in order to eliminate these various drawbacks, and does not require a conventional large construction frame (corresponding to the inner mold of the converter lining). Then, from a small construction frame that is divided in advance in the furnace height direction and partially manufactured in a fraction of the circumferential direction,
Select items according to each level (height) and carry them into the steel shell through the relatively narrow furnace opening above.
After fixing to the required construction frame mounting base, it sequentially rotates in the circumferential direction to form a solid gap between the steel shells, etc., and the filling density with the pouring material can be adjusted without any special skill. It is possible to safely and reliably construct a high-quality monolithic lining.

The present invention will be explained in detail below based on drawings showing one embodiment of a converter, but the present invention is not limited to this in any way, and can also be applied to a ladle or a chimney. .

That is, the first step of construction using the apparatus of the present invention is, for example, as shown in FIG. First, use a small crane (not shown) to attach the furnace bottom construction frame 17 to the furnace bottom 8.
After that, similarly attach the base 3 to the furnace opening (hardware).
2 and fix it. Next, the lifting device 13 is operated by remote control to slowly lower the construction frame mount 16 (indicated by a phantom line) that has been reduced and stored inside the base 3 in advance. The worker who entered the furnace stretched and enlarged it, tightened the nuts and firmly attached the furnace bottom construction frame 17, and then removed the furnace bottom construction frame 17, especially the side plate 21 and the curved furnace. A gap 30 having a desired shape is formed between the iron skin 23 of the bottom part 8 or a heat insulating material (not shown) pasted with mortar in advance.

The most important thing in this process is to form a solid gap 30 to prevent the pouring material 31 from leaking out during vibration filling, etc. After attaching the furnace bottom construction frame 17 to the section 19, etc., the attached fixing device 22, such as a small power cylinder (conductor wires omitted), is evenly extended near its tip, and the iron shell 23 is attached. Press it against the construction frame mounting base 16
is fixed in a predetermined position, but at this time, a sealing material (not shown) with some cushioning properties, such as a thin hard rubber, is inserted in advance between the side plate 21 and the iron skin 23. Good. Note that the furnace bottom construction frame 17 (including construction frames such as the hearth slope construction frame 24) must be carried into the furnace bottom 8 before the construction frame mounting base 16 is lowered into the steel shell 23 in advance. There is no need to keep the central area 1.
8 and lowered at the same time, and may be removably attached to the arm portion 19 by tightening a nut as described above.

Next, in the second construction process, after the lower end of the material hose 9 made of, for example, nylon is firmly fixed between the gap 30, the kneading and pressure feeding device 12 is operated by remote control, and water or other binder is At the same time, the well-known pouring material 31, which has been added and kneaded, is pumped under relatively low pressure and continuously supplied from above. The vibrator 28, which is a vibrator or a rotary vibrator with an unbalanced weight, is operated for several minutes to thoroughly fill the liquid. Note that when using a pouring material 31 with particularly good workability, the vibrating device 28 is not necessary, but in general, after the vibrating filling, the heating device 29, such as an electric heater or a steam heater, is installed. Heating (warm temperature) shortens the curing time and speeds up the construction work.

The poured material 31 is poured into a required gap 30 formed in advance with the furnace bottom construction frame 17, etc.
A castable refractory with fluidity or thixotropy to the extent that it can be pumped and filled by the kneading and pumping device 12, such as a castable to which a well-known deflocculant is added. Aggregates such as mag and mud linker are used, with the addition of fine brick scraps, pitch, and appropriate deflocculants and coagulants. Depending on the circumstances of the work, the pouring material 31 to which a necessary well-known binder has been added and kneaded elsewhere may be forced to the kneading and pressure feeding device 12 using another pressure feeding device (not shown), without being kneaded. , may be supplied to the gap 30 as is.

In the third and final construction process, after the pouring material 31 has hardened, the lifting device 13 is operated in reverse again by remote control, the wire 14 is gradually rolled up, and the furnace bottom construction frame 17 is unframed upward. After the worker removes one of the side plates 21, the operator holds the turntable 5 at the required angle (equivalent to the angle between the side plates 21, generally
45°) in the direction of the other side plate 21, and the operation is performed almost in accordance with the first and second steps described above, and if necessary, the above steps can be performed by rotating (furnace By repeating this process a required number of times in the (circumferential) direction and filling the remaining center hole 32 (indicated by a phantom line) with the pouring material 31 and curing it, the pouring of the lining 25 of the furnace bottom 8 is completed. However, during the final construction, before forming the gap 30, it is necessary to also remove the other side plate 21 that was previously attached to the construction frame mount 16 or the like.

After the construction of the hearth bottom part 8 is completed, the worker installs the construction frame 24 for the hearth inclined part and the other construction frames for the straight body part as shown in FIG. By sequentially attaching and detaching the construction frames for the sloped part of the furnace mouth (none of which are shown) and repeating the above steps in the circumferential direction at each height the required number of times, the entire lining 25 is filled with the poured material 31. can be constructed safely and reliably.

In addition, for example, if you want to build only the charging side of the straight body part (furnace belly) 33 thicker than other parts, when rotating the construction frame in the circumferential direction, the width of the side plate 21 (equivalent to the thickness of the lining 25) ) with the larger construction frame for the straight body, and pour the pouring material 3 in the same way.
After filling and curing 1, all you have to do is return it to the original construction frame. After constructing the entire lining 25 in this way, the various construction frames are placed on the reduced construction frame mounting base 16 again and carried up, and then the base 3 is moved from the furnace opening 2 by a crane. Since the construction frame and other equipment can be used many times over a long period of time, it is possible to save on materials and furnace construction costs, and to reduce the number of times required for conventional bricklaying work. There is no need for any assistants, resulting in a huge labor savings.

Note that the above explanation is based on the construction frame mounting base 16.
This was done based on the case of installing the base construction frame, but the construction work can be further speeded up by using a device with multiple units installed approximately symmetrically at appropriate intervals. .

Next, the apparatus of the present invention will be described in detail.

The apparatus of the present invention forms a solid gap 30 for filling the pouring material 31 in the so-called upper recessed steel shell 23, where the furnace mouth 2 is narrower than the straight body 33, and can be filled with a small number of people. It is constructed for the purpose of safely and reliably constructing a uniform lining 25 of high density, and its features are as described below.

That is, the first feature of this device is that, as shown in FIG. A disk-shaped rotary table 5 with a bevel gear 4 around the periphery is provided on the upper side of the furnace 3 so that it can be rotated in forward and reverse directions and stopped freely by a roller bearing 6 and a motor 7 with a reduction gear.
A flexible material hose 9 or non-flexible pipe with a length of about 200 mm and an inner diameter of about 200 mm passes through the center of the rotary table 5 and connects the screw feeder 10 or pressure pump and hopper 11. A well-known kneading and pumping device 12 (kneading capacity 10~
20/ton/hour) is connected to the outlet. The kneading and pressure feeding device 12 is usually one unit, and if necessary, multiple units are fixedly installed in the center of the rotary table 5, but depending on the circumstances of the site, it may be installed on a nearby work floor (not shown). It may be left undisturbed. Further, on both sides thereof, a lifting device 13 consisting of usually two winches, but if necessary, three or more winches is provided facing each other, and a steel wire 14 having a length reaching at least the furnace bottom 8 is provided. is passed through an oblong hole 15 formed in the rotary table 5 and wound around the drum. Furthermore, the second feature is that a foldable or expandable steel construction frame mount 16 is horizontally suspended from the lower end of the wire 14, and below it there is a construction frame 17 for the bottom of the furnace, etc. The advantage is that several types of construction frames with different shapes can be attached and detached one after another depending on the situation.

That is, when the construction frame mounting base 16 is passed through (raised and lowered) through the relatively narrow furnace opening 2, it is reduced as small as possible, and after it has stopped at a predetermined location (height) in the furnace, it is expanded. Several types of construction frames are installed, which will be described later.
As shown in Fig.
An arm portion 19 of the required length is attached to the corner of the square center portion 18.
or, as shown in FIG. 2, a well-known extensible and contractible steel frame 20 is installed at the center 18 at a required angle (the angle between the side plates 21 of the construction frame, which will be described later). (identical to) are used, but in both cases, a fixing device 22 consisting of a small power cylinder or the like is provided near the tip of the arm 19 or frame 20 at 90 degrees in four directions. There is.

Next, as shown in Figure 3, the construction frame used for this device is generally made by combining steel plates with a thickness of about 5 to 8 mm into the required shape, and is curved and bent for use in converters. There are a total of four types of construction frames 17 for the hearth bottom and construction frames 24 for the sloped part of the hearth in order to fit well with the steel shell 23. For example, the construction frame 17 for the hearth bottom is shown in Fig. 3a. As shown, a substantially fan-shaped inner plate 2 is curved to match the inner surface of the inner lining 25 of the furnace bottom 8 to be constructed.
6, a pair of side plates 21 whose lower sides are in close contact with the furnace bottom 8 and whose upper sides have a plurality of bolts 27 welded are attached to the angle between the arms 19 (generally 45
It is removably fixed with bolts and nuts at the same angle as ゜), and the above-mentioned vibrating device 28 and heating device 29 are provided on the upper (inner) surface of the inner plate 26. .

Note that the inner plate 26 made of steel has the required diameter and height.
The apparatus of the present invention, in which a construction frame for a cylindrical body consisting of a cylindrical body, etc., is attached in advance to the construction frame mount 16 is placed upright and fixed in advance on a long steel or concrete outer shell (block) that is higher than the base. (none of which are shown), lower the construction frame mounting base 16 to the lowest part from the upper opening, form the gap 30 in the same manner as described above, fill the pouring material 31 and harden it, then the chimney The inner lining 25 can be similarly easily constructed.

As described in detail above, according to the construction device of the present invention, it is no longer necessary to perform bricklaying work for the lining of the converter, which was conventionally performed by many workers in a bad working environment with a lot of dust, and the work can be done in a good manner. It is a huge success because it allows a small number of workers (about half of the traditional number) to safely and reliably construct an integrated lining with uniform and high filling density using castable or other poured materials without requiring any skill. It has many advantages, including the ability to save a lot of labor, save energy by making it amorphous, and significantly reduce the cost of furnace materials.It also allows for partial repair of linings such as ladles, if necessary. It can also be applied to

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional schematic diagram showing the procedure for placing the device of the present invention at the mouth of a converter and pouring the lining. A schematic plan view showing the embodiment, FIG. 3 also relates to the construction frame, a is a sketch of the construction frame for the furnace bottom, b
1 is a sketch showing a state in which a construction frame for a hearth slope part is attached to an arm part to form a gap part. In the figure, 3...base, 5...rotating table, 13...lifting device, 16...construction frame mounting base, 17...construction frame for furnace bottom, 22...fixing device, 25...lining, 3
0...Gap portion, 31...Pouring material.

Claims (1)

[Claims] 1. A base with a rotary table on which a lifting device and a rotation mechanism are mounted, which is rotatably installed approximately in the center and has a central opening, and a retractable base that is suspended from the lifting device and has a fixing device attached near the outside. A converter lining pouring construction device comprising a construction frame mount having a plurality of frames, and a construction frame having a desired shape that can be removably fixed to the construction frame mount. .