JPS5848335Y2 - Device to prevent debris from falling on blast furnace inner walls - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for preventing the falling of deposits on the inner wall of a blast furnace, and more specifically, to ensure safety during repair or intermediate renovation of the blast furnace, the device prevents deposits on the inner wall of the blast furnace from falling. The purpose is to propose a device that prevents falls.

In general, in blast furnaces that have undergone blowdown, deposits and unstable bricks remain on the inner walls of the furnace, and when working tools enter the furnace from the tuyere level for intermediate furnace renovations or internal repairs, Accidents may occur due to deposits or falling brick blocks, which poses a safety problem.

Conventionally, as shown in Fig. 1, a bitty scaffolding 5 was constructed from below in the circumferential direction of the furnace, or the furnace opening 6 was installed as shown in Fig. 2 before entering the furnace from the tuyere level. A circular scaffold 3 that has been assembled in advance by a winch 2
is suspended by a wire 7, and a working tool rides on it to remove deposits 4 from the inner wall of the furnace.

After removing this level of deposits, lower the scaffold 3 with the winch 2 again, spread the scaffold 3 in the radial direction of the furnace to stabilize the space between it and the furnace wall, and then repeat the process of removing the deposits 4. The deposits 4 on the inner wall of the furnace were removed by the following steps.

However, the method shown in FIG. 1 poses a safety problem since there is a risk that the material 4 deposited on the upper furnace inner wall may fall while the bitty scaffolding 5 is being assembled sequentially from the bottom to the top.

In addition, in the method shown in Fig. 2, since the deposits are removed sequentially from above, it is safe from falling deposits, but since the scaffold 3 is suspended from the top,
If the overall balance is not maintained at all times, there is a danger that the work tools on the suspended scaffolding will tip over or fall, and the work of installing the stairs 15 going down from the furnace mouth 6 to the suspended scaffolding 3 as it goes downwards, and the scaffolding It becomes difficult to go up and down.

As described above, both methods shown in FIG. 1 and FIG. 2 have the disadvantage that it is difficult to safely remove the deposits 4 on the furnace inner wall.

The present invention was developed to solve the above-mentioned drawbacks, and is designed to prevent deposits from falling on the inner wall of the blast furnace when the furnace is empty after blowdown, and to enable safe work inside the furnace. The present invention provides a device for preventing the fall of material deposited on the inner wall of a furnace.

This invention is a device to ensure the safety of work inside the blast furnace when performing intermediate repairs or removing deposits on the furnace inner wall while the blast furnace is in the blow-down state. This is a fall prevention device installed all over the inside of the furnace to prevent accidents caused by falling bricks, etc.

In other words, the circumferential direction of the blast furnace mouth and siding is divided into a plurality of sections, wires are installed between the corresponding furnace mouth and siding in each section, and the wires are Then, between two adjacent wires, in the direction of the furnace height, multiple units of wire mesh, hemp, nylon, etc. A wire mesh or net strip from the mouth of the blast furnace to the siding, which is fixed with fixing metal fittings such as bolts protruding from holes or openings after removal of the cooling plate, is installed from the mouth of the blast furnace to the siding. This is a device that is installed all over the inside of the furnace in the circumferential direction and the height direction of the furnace to prevent deposits from falling on the inside walls of the blast furnace.

Note that the removal of deposits on the furnace inner wall, or the exposure of the furnace inner wall portion necessary for repair or renovation is carried out by removing the wire mesh or net unit in the relevant range.

Next, the present invention will be explained with reference to drawings of an apparatus showing an example of its embodiment.

FIG. 3 is a drawing of an embodiment of the present invention, in which 1 is a blast furnace body, 2 is a winch, 4 is a material deposited on the furnace inner wall, 7 is a wire, 8 is a bell, and 9 is a prevention of falling material deposited on the furnace inner wall. It is made of wire mesh, linen, nylon, etc. that can be expanded and contracted in the short circumferential direction.

Numeral 10 is a bolt for fixing the wire mesh or net 9, which is inserted into the furnace from the outside of the iron shell using the fixing bolt hole of the stave 13 for cooling the furnace body or the opening after the cooling plate is removed.
Hang a wire mesh or net 9 and fix it to the steel shell side of the tensile furnace body.

The details of the fixing bolts are shown in Fig. 4.

11 is a tuyere, 12 is a winch for winding one end of the wire 7, and 13 is a stave or cooling plate for cooling the blast furnace body.

Further, FIG. 5 shows a state in which a wire mesh or net 9 is detachably attached between two wires 7 using metal fittings 14.

In addition, in FIG. 6, the net 9 is double-strung to ensure safety in the event of damage.

The procedure for installing the device of the present invention inside the blast furnace in the blowdown state will be described below (see Fig. 3).

First, the wire 7 is inserted into the furnace from several places in the circumferential direction of the furnace mouth, and is lowered in the furnace height direction to the level of the tuyere 11.

These wires 7 are pulled out from the tuyere 11 onto the work floor and wound onto a winding drum of a winch 12 installed on the work floor.

Next, a unit of wire mesh or net 9 is installed on the scaffold provided in the furnace at the furnace mouth, and both ends of the wire mesh or net 9 are attached to two adjacent wires among the previously attached wires. Attach it using the metal fittings 14 (see Figure 5).

This operation is repeated in the circumferential direction to stretch the wire mesh or net 9 to a height of one unit in the circumferential direction.

Then, by loosening the wire 7 with the winch 2 and winding it up with the winding winch 12 at the same time, one unit of wire mesh or net 9 is rolled up on the scaffold provided in the furnace at the mouth of the furnace.
The unit is then taken down onto the scaffold, and the fittings 14 are used to connect the unit between the wires following the previous wire mesh or net unit.

By repeating these operations, the wire mesh or net can be stretched in the direction of the furnace height up to the tuyere level.

The wire mesh or net 9 that remains stretched in this way can also prevent the falling of the materials deposited on the furnace inner wall to some extent, but in order to provide even more strength, the furnace body cooling stave 13 must be Insert fixing fittings 10 such as fixing bolts into the furnace by using the openings from which some of the fixing bolts have been removed or by using the openings after removing the cooling plate.
By pulling the wire mesh or net 9 toward the furnace wall, it is possible to more completely prevent the deposits 4 on the furnace inner wall from falling.

In the above embodiment, the wire mesh or net was taken in from the furnace mouth, but if the iron skin at the tuyere level is opened, a folded wire mesh or net formed in advance to fit the inside dimensions of the furnace as shown in Fig. 7 may be used. - An appropriate method can be adopted, such as introducing a cylindrical wire mesh or net that can be viewed through the opening.

The repair work procedure for the furnace bottom bricks and shaft portion, which is performed after the safety measures have been taken by attaching the device for preventing the fall of materials deposited on the furnace inner wall to the blast furnace body as described above, will be explained.

In order to repair the furnace bottom bricks, after installing the above-mentioned device to prevent the fall of deposits on the furnace inner wall, workers open the steel skin at the tuyere level, enter the furnace, and excavate the furnace bottom below the siding level. , repair work on furnace bottom bricks can be carried out safely without worrying about the danger of objects falling from above.

In addition, in order to repair or repair the shaft above the tuyere level, it is necessary to remove the deposits on the furnace inner wall, which requires assembling and removing the bidet scaffolding shown in Figure 1 from the tuyere or hearth bottom level. One unit of the wire mesh or net 9 corresponding to the required position of the furnace inner wall deposits is removed, and using it as a catch, the furnace inner wall deposits at the removed locations are successively removed.

By repeating this operation, you can completely remove the deposits on the furnace inner wall of the shaft section, and after the danger of falling objects has been eliminated, loosen the wire mesh or net 9's fixing pole 10 and move it forward. The installation described allows the necessary repairs to the shaft to be safely carried out after the preventer has been removed by reversing the method.

This invention is a safety feature that allows work to be carried out without falling from above, such as scaffolding for repairing the bottom of a blast furnace or removing deposits on the furnace inner walls, from below. The blast furnace body equipped with the device of the present invention has a great effect on ensuring safety during intermediate blast furnace repair work and the like.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of a conventional method for removing deposits from the inner wall of a furnace, and Figure 3 is a schematic diagram showing an embodiment of the present invention.
Fig. 4 is an explanatory diagram of fixing bolts, Fig. 5 is an explanatory diagram showing an example of wire attachment of a wire mesh or net, Fig. 6 is a detailed explanatory diagram of a furnace wall curing net, and Fig. 7 is a means for lifting the net. It is an explanatory view showing one example. 1...Furnace body shell, 2...Winch, 3
...Hanging scaffolding, 4...Furnace inner wall deposits,
5... Biday scaffolding, 6... Furnace mouth, 7.
...Wire, 8...Bell, 9...
・Wire mesh or net, 10... Fixing bolt, 11... Tuyere, 12... Winch,
13...Stave, 14...Metal fittings, 15...Stairs.

Claims (1)

[Scope of utility model registration request] In the blowdown state of the blast furnace, the circumferential direction of the blast furnace mouth and siding is divided into a plurality of sections, and wires are installed between the corresponding furnace opening and siding in each section. A structure in which multiple wire gauze or net units are removably attached in the direction of the furnace height between two adjacent wires of the wires, and are fixed with fixing fittings protruding from the opening of the furnace body cooling device. , a device for preventing falling of material deposited on the inside wall of a blast furnace, which is installed over the entire area of the inside of the blast furnace in the circumferential direction and in the furnace height direction from the furnace mouth to the tuyere.