JP7436813B2 - Blast furnace repair tools and their installation method - Google Patents

Description

The present invention relates to a blast furnace repair tool and a method for installing the same.

Conventionally, safety nets have been installed inside blast furnaces to ensure the safety of work inside the blast furnaces during blast furnace renovation work. That is, the safety net is used to prevent deposits attached to the inner walls of the blast furnace from falling onto the heads of workers. In this state, the bottom of the hearth will be dismantled and a safety ceiling will be installed to divide the work space into upper and lower sections. For example, staves are repaired above the safety ceiling, and refractories are repaired below the safety ceiling.

It usually takes about 10 days to complete the series of work such as "cooling of the contents inside the furnace by water injection cooling → removal of various obstacles for scraping out the contents inside the furnace → opening and scraping work → installation of a safety ceiling." It takes. Furthermore, installation of the safety net is subject to various restrictions such as installation location, installation time, installation method, etc., and requires approximately two to three working days.

For example, the conventional upper safety net setting method is performed by the following steps 1) to 4).
1) After opening the steel shell and scraping out obstacles in the lower part of the blast furnace (usually the tuyere part), the wire is suspended from the upper part of the blast furnace to the lower part of the blast furnace.
2) A wire (suspension wire) for suspending a safety net from the upper part of the blast furnace is drawn into the blast furnace via the wire, and one end of the suspension wire is connected to the safety net outside the blast furnace. Note that a wire for fixing the lower end to the blast furnace wall (wire for fixing outside the furnace) is provided at the lower end of the safety net.
3) Hoist the hanging wire from the top of the blast furnace using a winch.
4) Using a jig such as a key rod, guide one end of the wire for fixing outside the furnace to the outside of the blast furnace through an existing opening provided in the middle stage of the blast furnace. There are usually 8 to 16 existing openings provided in the middle stage of the blast furnace, and the wire for fixing outside the furnace is provided corresponding to each of these openings.

In order to perform step 2), at least one worker needs to perform the step inside the blast furnace. Furthermore, since the weight of the hanging wire is from several tons to more than ten tons, multiple people are required to perform step 3) manually, making it impossible for a single worker to perform step 3). It is. Further, when performing step 4), it is necessary to take in the wire for fixing outside the furnace corresponding to each opening, but since the openings are generally narrow, the field of view is also narrow. Therefore, the step 4) is difficult.

As described above, the installation of the safety net requires a large amount of man-hours by the worker, and the work is performed while checking for objects falling from the upper part of the furnace, resulting in poor work efficiency.

Patent Document 1 discloses a fall prevention device for material deposited on the inner wall of a blast furnace. The fall prevention device divides the furnace mouth and tuyeres of the blast furnace into a plurality of sections in the circumferential direction, and installs wires between corresponding furnace mouths and tuyeres in each section, and A plurality of wire gauze or net units are installed in the furnace height direction between two adjacent wires of the main wire, and in the circumferential direction inside the furnace from the furnace mouth to the tuyere and in the furnace height direction. It has a structure that extends over the entire area.

According to Patent Document 1, the fall prevention device prevents accidents caused by objects falling from the upper part of the blast furnace, such as unstable bricks, etc., from the top during intermediate repairs of the furnace or removal of objects adhering to the furnace inner walls. It has been reported that it is effective.

Patent Document 2 discloses a method for maintaining and repairing the safety of the inner wall of a blast furnace. The method for maintaining and repairing the safety of the inner wall of a blast furnace involves inserting a wire net using a wire rope or the like into the furnace through at least one opening at or near the furnace mouth, fixing the upper end to the inner periphery of the furnace mouth, and winding the wire net into a roll. After unraveling the wire rope so that the lower end reaches a predetermined depth inside the furnace, the wire rope is pulled from the outside of the furnace to the shell side through multiple openings in the furnace wall, and the wire rope is pulled inside the furnace. It is characterized by being fixed to the wall.

According to Patent Document 2, the blast furnace inner wall safety maintenance and repair method reliably maintains the furnace inner wall safely in a short period of time so that workers can safely enter and work inside the furnace, and significantly shortens the repair period. It describes what you can do.

Publication No. 58-48335 Japanese Unexamined Patent Publication No. 63-312908

However, the conventional techniques described above have several problems.

In the fall prevention device disclosed in Patent Document 1, the removal of deposits on the furnace inner wall, or the exposure of the furnace inner wall portion required for repair or renovation, must be done by removing the wire mesh or net unit in the corresponding range. In that case, a safety problem will occur and the construction itself will not be possible. In addition, the fall prevention device has wires installed in each of the plurality of sections, and a plurality of wire gauze or net units are installed in the direction of the furnace height between two adjacent wires from the mouth of the blast furnace to the tuyere. It is necessary to repeat the work of lining the entire area in the circumferential direction inside the furnace and in the furnace height direction up to the point. Therefore, the fall prevention device requires a large amount of man-hours and time of the worker, and the period of repair work is significantly extended. There is also the issue of what safety measures to take during the wire mesh installation work itself.

Further, in the fall prevention device disclosed in Patent Document 1, the net unit is fixed between the tuyere and the furnace mouth, so the fixed height of the net unit cannot be changed freely. .

Furthermore, in the blast furnace inner wall safety maintenance and repair method disclosed in Patent Document 2, a plurality of wire mesh nets are required to cover the entire furnace inner circumferential wall with the wire mesh net. Therefore, in Patent Document 2, although it is preferable to attach it to the entire inner peripheral wall of the furnace, it is said that it is sufficient to provide it only in places where there is a particular risk of flying and falling objects. However, since it is difficult to predict the locations where flying and falling objects will occur, a large amount of worker effort is required to ensure worker safety.

In addition, in blast furnace renovation work, the repair work usually changes from bottom to top over time in the height direction. In the method for maintaining and repairing the safety of the inner wall of a blast furnace disclosed in Patent Document 2, the range of the covering portion must be corrected every time work is performed on the relevant part, which makes the work extremely complicated.

As described above, the conventional method requires a lot of time and effort to install a safety net to ensure the safety of workers inside the blast furnace, and has poor workability. The present invention was devised in view of the above-mentioned problems, and its purpose is to reduce the number of man-hours required for workers to install repair tools such as safety nets in the blast furnace, and to To provide a safety net and its installation method that eliminates the need for workers to enter the furnace and has good installation workability.

The blast furnace interior repair tool according to the present invention is used by being suspended in the blast furnace from the upper part of the blast furnace (hereinafter referred to as "furnace upper part") via a hanging wire. Moreover, the blast furnace interior repair tool according to the present invention includes a fall prevention member connected to the hanging wire, and an expansion member attached to the fall prevention member and into which a pressure medium is introduced. Furthermore, the blast furnace interior repair tool according to the present invention is characterized in that the expansion member expands by injecting a pressure medium into the interior thereof so as to be in contact with the entire circumference of the blast furnace inner wall.

The blast furnace repair tool according to the present invention has a structure in which an expansion member is arranged at a predetermined position in the furnace height direction when installed in the blast furnace. Therefore, by expanding the expansion member with a pressure medium such as air until it touches the inner wall of the blast furnace, a frictional force can be generated between the expansion member and the inner wall of the blast furnace. The frictional force acts to prevent the expansion member from sliding downward, and thus acts as a supporting force to hold the fall prevention member at a desired height position.

In addition, according to the blast furnace interior repair tool according to the present invention, a series of operations such as "cooling of the contents in the furnace by water injection cooling → removal of various obstacles for scraping out the contents in the furnace → opening and scraping work" During this process, the fall prevention member is lowered from the upper part of the furnace via a hanging wire, and the expansion member can be expanded or contracted at a desired height position.

In the above structure, the blast furnace repair tool may be configured such that the expansion member is provided at a lower end of the fall prevention member.

Moreover, in the said structure, the said blast furnace repair tool may be provided with the said expansion member in multiple numbers.

Further, in the above structure, the blast furnace repair tool may be configured such that the expansion member expands and contracts in a bellows shape.

Further, in the blast furnace interior repair tool, the expansion member may be made of lightweight fiber in the configuration.

Moreover, in the above-mentioned structure of the above-mentioned blast furnace repair tool, the fall prevention member may be a sheet-like member.

Moreover, in the above-mentioned configuration of the blast furnace internal repair tool, the fall prevention member may be a net-like member.

Further, in the above structure, the blast furnace repair tool is configured such that the fall prevention member is composed of a net-like member and a sheet-like member, and a part or the whole of the net-like member is covered with the sheet-like member. It's okay.

Moreover, in the above-mentioned configuration of the blast furnace internal repair tool, the mesh size of the net-like member may be 1 mm or more and 50 mm or less.

Further, in the above-mentioned configuration of the blast furnace internal repair tool, the fall prevention member may be made of lightweight fiber.

Moreover, in the said structure, the said blast furnace repair tool may be comprised so that the said fall prevention member may be equipped with the support wire couple|bonded with the blast furnace side surface.

The present invention also provides a method for installing the blast furnace repair tool according to the present invention.
A method for installing a repair tool in a blast furnace according to the present invention includes a step of suspending attachment wires corresponding to each of the suspension wires from the upper part of the furnace, a step of coupling each of the suspension wires to the attachment wire, and a step of: suspending the blast furnace repair tool in the blast furnace via the attachment wire and the hanging wire; and pressurizing a pressure medium into the expansion member to expand the expansion member so as to contact the inner wall of the blast furnace. It is characterized by having a process.

Moreover, in the method for installing a blast furnace repair tool according to the present invention, the attachment wire may be attached to the center of the upper part of the furnace.

Moreover, in the method for installing a repair tool in a blast furnace according to the present invention, the attachment wire may be attached on a single circumference centered on the center of the upper part of the furnace.

Furthermore, in the method for installing a blast furnace repair tool according to the present invention, the attachment wire may be attached on the circumference of a plurality of concentric circles centered on the center of the upper part of the furnace.

Furthermore, in the method for installing a blast furnace repair tool according to the present invention, the attachment wires may be attached at equal intervals on the circumference.

Furthermore, in the method for installing a blast furnace repair tool according to the present invention, the attachment wire may be attached to a raw material input port, a gas collection mantel opening, and an ore receiver attachment port.

Moreover, in the method for installing a blast furnace repair tool according to the present invention, the attachment wire may be attached to at least six locations on the same circumference.

Moreover, the method for installing the blast furnace interior repair tool according to the present invention may include a step in which the fall prevention member is provided with a support wire, and the support wire is attached to a side surface of the blast furnace.

Further, in the method of installing the blast furnace repair tool according to the present invention, air may be introduced into the expansion member at room temperature and atmospheric pressure at a pressure of 1 MPa or less.

Moreover, the method for installing the blast furnace interior repair tool according to the present invention may include press-fitting the pressure medium using a press-fitting device having a pressure indication value and a pressure regulating valve.

Further, the method for installing the blast furnace repair tool according to the present invention includes, after the step of expanding the expansion member so as to contact the blast furnace inner wall, reducing the pressure of the expansion member to reduce the height of the blast furnace repair tool. The method may also include a step of changing the horizontal position and expanding the expansion member again at the changed vertical position of the blast furnace repair tool.

According to the present invention, it is possible to reduce the number of man-hours required of a worker for installation, reduce the work that should be considered in terms of labor safety, and improve work efficiency. In turn, it becomes possible to shorten the period for repairing the blast furnace.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows the state in which the blast furnace repair tool 1 of 1st Embodiment of this invention was installed in a blast furnace. In the blast furnace repair tool 1 according to the first embodiment of the present invention, this is a configuration example in which the expansion member 30 is provided at the lower end of the fall prevention member 20. This is a modification of the blast furnace interior repair tool 1 according to the first embodiment of the present invention, and has a structure in which it is hung using a plurality of hanging wires. (A) to (C) are schematic views of the use state of the fall prevention member 20 in a state where the expansion member 30 of the blast furnace interior repair tool 1 of FIG. 2-1 is in contact with the entire circumference of the blast furnace inner wall. This is a modification of the blast furnace interior repair tool 1 according to the first embodiment of the present invention, in which the fall prevention member 20 is configured by combining a net-like member and a sheet-like member. This is a modification of the blast furnace repair tool 1 according to the first embodiment of the present invention, in which support wires 25a and 25b are provided so that the blast furnace repair tool 1 can be stably fixed at a desired height. be. 3A and 3B are diagrams showing a configuration example of an inflatable member 30, in which (A) is a schematic outline of the torus-shaped inflatable member 30, (B) is a schematic outline of an inflatable member that can be expanded and contracted in a bellows shape, and (C) is a diagram showing a schematic outline of the inflatable member 30. This is a schematic outline of an expansion member 30 formed in a spiral shape. It is a figure explaining the method of moving the blast furnace repair tool 1 to a desired height position. It is a schematic sectional view showing the state where blast furnace repair tool 1 of a 2nd embodiment of the present invention is installed in a blast furnace. It is a schematic sectional view showing the state where blast furnace repair tool 1 of a 3rd embodiment of the present invention is installed in a blast furnace. FIG. 3 is a diagram showing a configuration example of the expansion member 30, in which a plurality of expansion members are arranged concentrically in the height direction, and communication pipes through which pressure medium can freely flow are arranged radially between the expansion members adjacent in the height direction. This is what I did. It is a figure explaining the process of installing the blast furnace repair tool 1 in a blast furnace of 2nd Embodiment of this invention. It is a figure explaining the process of installing the blast furnace repair tool 1 in a blast furnace of 2nd Embodiment of this invention. It is a figure explaining the process of installing the blast furnace repair tool 1 in a blast furnace of 2nd Embodiment of this invention.

Next, first to third embodiments of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar symbols. However, it should be noted that the drawings are schematic and the ratio of each part may differ from the actual one.

In addition, the first to third embodiments shown below illustrate devices and methods for embodying the technical idea of the present invention. The material, shape, arrangement, etc. are not limited to those shown below. The technical idea of the present invention can be modified in various ways within the technical scope described in the claims.

<First embodiment>
FIG. 1-1 is a diagram illustrating a blast furnace interior repair tool 1 according to a first embodiment of the present invention. The blast furnace 100 illustrated in FIG. 1-1 is a blast furnace equipped with a so-called bellless charging device that charges raw materials using a rotating chute. When the blast furnace 100 is renovated, the rotating chute is removed and the raw material inlet 111 is left open. The blast furnace interior repair tool 1 includes a hanging wire 11 suspended from a raw material input port 111 of a furnace upper part 110 of a blast furnace 100, a drop prevention member 20 connected to the suspension wire 11, and a fall prevention member 20 attached to the fall prevention member 20. , and an expansion member 30 into which a pressure medium is introduced.

Although the positions of the fall prevention member 20 and the expansion member 30 are not particularly limited, in this embodiment, the fall prevention member 20 is connected to the lower end of the hanging wire 11, and the expansion member 30 is attached to the lower side of the fall prevention member 20. .
The expansion member 30 may be provided at the lower end of the fall prevention member 20 as shown in FIGS. 1-2. With such a configuration, the lower part 24 of the fall prevention member 20 is not required.

The suspension wire 11 suspends the fall prevention member 20 and the expansion member 30 from the upper part 110 of the blast furnace. In FIG. 1-1, the blast furnace interior repair tool 1 according to the first embodiment of the present invention has a structure in which it is suspended by only one hanging wire 11 through the raw material inlet 111, but it is temporarily installed in the furnace upper part 110. The number of hanging wires is not particularly limited as long as the weight allows the worker to insert the blast furnace repair tool 1 into the blast furnace from the deck.

Further, in an example of a blast furnace equipped with a bell-type charging device (not shown), the hanging wire 11 may not be suspended from the raw material inlet 111. In such a case, as will be described later, the blast furnace repair tool 1 may be suspended with a plurality of hanging wires through the gas collection mantel opening 112 and/or the ore receiver attachment port 113 and other furnace upper openings. Just do it.

In addition, in the case of a structure in which the fall prevention member 20 and the expansion member 30 are suspended by a plurality of hanging wires 11, the hanging wires 11 may be in an eccentric state, but the hanging wires 11 may be in an eccentric state. It is preferable to place the This is to maintain balance so that the expansion member 30 becomes horizontal when the expansion member 30 is expanded by pressurizing a pressure medium such as air into the expansion member 30. For example, as shown by the broken line in FIG. 1-1, from the gas collection mantel opening 112 and the ore receiver attachment port 113 in a point symmetrical manner with respect to the raw material inlet 111 provided at the center of the upper part of the furnace. A plurality of hanging wires 11 may be introduced into the blast furnace, and the lower ends of the hanging wires 11 may all be coupled to the upper end portion 21 of the fall prevention member 20.

FIG. 2-1 shows a modification of the blast furnace interior repair tool 1 according to the first embodiment of the present invention. The blast furnace interior repair tool 1 shown in FIG. 2-1 has a structure in which a hanging wire 112a is connected to a connecting part 21a provided on the fall prevention member 20, and a hanging wire 113a is connected to the expansion member 30 or the vicinity thereof. In this blast furnace repair tool 1, hanging wires 112a and 113a are connected to the blast furnace from a gas collection mantel opening 112 and an ore receiver attachment opening 113, respectively, which are provided in the upper part of the furnace 110 so as to be symmetrical about the raw material input port 111. It is configured such that the fall prevention member 20 and the expansion member 30 can be appropriately expanded by operating the hanging wire 113a that is suspended inside.

In addition, when there are a plurality of hanging wires suspended from the upper part of the blast furnace, as shown in FIG. 2-1, the hanging wires other than the hanging wire 11 are 11 as a center, it is preferable that the hanging wires 11 be attached concentrically at different height positions on the fall prevention member 20 from the attachment position of the suspension wire 11 (upper end portion 21 of the fall prevention member 20).

FIG. 2-2(A) is a schematic diagram of the use state of the fall prevention member 20 in a state where the expansion member 30 of the blast furnace interior repair tool 1 of FIG. 2-1 is in contact with the entire circumference of the blast furnace inner wall. In addition, as shown in FIG. 2-2(B), when the fall prevention member 20 is in use, the upper end portion 21 is connected to the hanging wire 112a suspended from the gas collection mantel opening 112 and the fall prevention member 20 is in use. It may be arranged below the connecting portion 21a with the member 20. Further, as shown in FIG. 2-2(C), when the fall prevention member 20 is in use, the coupling portion 21a is attached so as to be relatively lower than the upper end portion 21 and the expansion member 30. It's okay.

The fall prevention member 20 protects workers at the lower part of the blast furnace from falling deposits on the furnace inner wall and deteriorated refractory bricks. The material of the fall prevention member 20 has properties such as strength, elongation, and elasticity that can withstand falling deposits, and allows the worker to insert the blast furnace repair tool 1 into the blast furnace from a deck temporarily installed in the upper part of the furnace 110. There are no particular limitations as long as it is weight. In order to improve the workability of the blast furnace interior repair tool 1, the fall prevention member 20 may be constructed using, for example, lightweight fiber such as carbon fiber, high strength glass fiber, glass cloth, or the like.

When the blast furnace repair tool 1 is handled by multiple workers, the blast furnace repair tool 1 should be configured so that the weight of the blast furnace repair tool 1 is 20 tons or less, and the weight of the fall prevention member 20 is 10 tons or less. is preferred. However, in order to reduce the burden on the worker, it is particularly preferable that the weight of the blast furnace repair tool 1 be 1 ton or less, and the weight of the fall prevention member 20 be 500 kg or less.

In FIG. 1-1, the fall prevention member 20 is made of a net-like member, but it may be made of a sheet-like member. Furthermore, the fall prevention member 20 may be configured by combining a net-like member and a sheet-like member. When a net-like member is used as the fall prevention member 20, the rougher the mesh, the better the visibility and ventilation inside the upper blast furnace. There is an increased possibility that the worker will hit the worker below the fall prevention member 20. The mesh size can be set to a desired value of more than 0 mm, but for the above reason it is preferably 1 mm or more and 50 mm or less, more preferably 5 mm or more and 50 mm or less.

Further, the fall prevention member 20 may be configured by overlapping a net-like member and a sheet-like member. By stacking the net-like member and the sheet-like member, safety can be further improved.

FIG. 3 shows a modification of the blast furnace interior repair tool 1 according to the first embodiment of the present invention. D ₀ is the maximum distance between inner walls among the distances between inner walls in the horizontal plane at any height of the blast furnace. In the fall prevention member 20 of the blast furnace interior repair tool 1 shown in FIG. 3, a region 22 with a diameter ΦD centered on the upper end 21 is composed of a net-like member, and an outer region 23 is composed of a sheet-like member. . Note that the diameter ΦD may be, for example, the same size as the outer diameter of the attachment part 114 of the rotating chute into which the raw material is introduced. Further, in the modification shown in FIG. 3, holes may be provided in the sheet-like member in the outer region 23, through which wires suspended from the furnace upper part 110 or the like are passed. By configuring as shown in FIG. 3, the fall prevention member 20 can be made lighter than when configured by simply overlapping a net-like member and a sheet-like member.

Further, the fall prevention member 20 may be provided with a support wire 25 that is coupled to the inner wall of the blast furnace or a support portion on the outside of the blast furnace. FIG. 4 shows a modification of the blast furnace interior repair tool 1 according to the first embodiment of the present invention, in which support wires 25a and 25b are provided at the lower end of the lower side 24 of the fall prevention member 20. The blast furnace repair tool 1 having the structure shown in FIG. 4 has a structure in which one ends of the support wires 25a and 25b can be led out to the outside of the blast furnace through openings 40a and 40b provided on the side surface of the blast furnace. Therefore, the blast furnace interior repair tool 1 shown in FIG. The support force provided by the wires 25a and 25b allows the fall prevention member 20 to be more stably placed at a desired height.

Further, the support wires 25a and 25b may be provided at a plurality of locations in the height direction and circumferential direction of the blast furnace, or may be provided in the expansion member 30. Similarly, the openings 40a and 40b may be provided at a plurality of locations in the height direction and circumferential direction of the blast furnace so that the blast furnace repair tool 1 can be stably fixed at a desired height.

The expansion member 30 is configured to be able to expand with a pressure medium such as air via a pressure medium introduction pipe 31 until it comes into contact with the inner wall of the blast furnace. For example, the expansion member 30 is made of a highly airtight material made of a nylon material with a heat resistance temperature of 50° C. or higher, a plastic resin such as rubber, and/or a lightweight fiber such as carbon fiber, and is made of a material with high airtightness such as a pressure medium inlet and an outlet. The structure may be such that the pressure medium is sealed so that the pressure medium does not leak from other than the outlet. The pressure medium may be air, nitrogen gas, or a liquid such as water. Moreover, it is preferable that the weight of each expansion member 30 is 50 kg or less.

The expansion member 30 is designed to ensure visibility of the upper part of the blast furnace, reduce the weight of the blast furnace repair tool 1, prevent the central portion of the expansion member 30 from deflecting, and reduce the labor of the operator. It is preferable that the outer shape is approximately annular when expanded until contacting the inner wall of the blast furnace. For example, the outer shape when expanded may be a torus shape as shown in FIG. 5(A). Alternatively, as shown in FIG. 5(B), the expansion member 30 may be configured to expand and contract in a bellows-like manner using a nylon material with a heat resistance temperature of 50° C. or higher, a plastic resin such as rubber, and/or a lightweight fiber. good. Further, as shown in FIG. 5(C), the expansion member 30 may be configured in a spiral shape.

When the expansion member 30 is expanded, the expansion member 30 can be brought into contact with the inner wall of the blast furnace over the entire circumference at a desired height position in the blast furnace, when the expansion member 30 is viewed from the upper part of the furnace. It is attached to the fall prevention member 20. "Contacting over the entire circumference" is not strictly limited to the case where the expansion member 30 is in contact with the blast furnace inner wall at all 360° circumferential positions, and the expansion member 30 is in contact with the blast furnace inner wall at some circumferential positions. This also includes cases where there is a gap with the inner wall of the blast furnace.

From the viewpoint of generating sufficient frictional force between the outer surface of the expansion member 30 and the blast furnace inner wall, it is preferable that the expansion member 30 is in contact with the blast furnace inner wall at all 360° circumferential positions. For example, it is preferable to shape the expansion member 30 so that the expansion member 30 can expand to a diameter D ₃₀ that is approximately the same as the maximum distance between inner walls D ₀ . Further, the expansion member 30 is attached to the fall prevention member 20 at a distance corresponding to the desired height position from the upper end 21 of the fall prevention member 20.

In order to move the blast furnace interior repair tool 1 to a desired height position, as shown in FIG. When the repair tool 1 is moved and the blast furnace repair tool 1 reaches a desired height position, the expansion member 30 is moved until the expansion member 30 comes into contact with the blast furnace inner wall as shown in FIG. 1-1 (B). A pressure medium may be introduced into the chamber 30. In this manner, by adjusting the internal pressure of the expansion member 30, the frictional force between the expansion member 30 and the inner wall of the blast furnace can be adjusted. The inner diameter of the blast furnace changes depending on the height of the blast furnace, but as shown in FIG. 6, the blast furnace repair tool 1 can be moved to a desired height position and stably placed.

<Second embodiment>
FIG. 7 is a diagram illustrating a blast furnace interior repair tool 1 according to a second embodiment of the present invention. The blast furnace interior repair tool 1 of the second embodiment suspends the fall prevention member 20 and the expansion member 30 using hanging wires 11, 112a, and 113a, and connects one end of the support wires 25a and 25b to an opening 40a provided on the side surface of the blast furnace. , 40b to the outside of the blast furnace.

<Third embodiment>
FIG. 8 is a diagram illustrating a blast furnace interior repair tool 1 according to a third embodiment of the present invention. The blast furnace interior repair tool 1 of the third embodiment has a structure including a plurality of expansion members 30 arranged concentrically. Moreover, in the blast furnace repair tool 1 of the third embodiment, the expansion members 30a, 30b, 30c, 30d, and 30e are arranged so as to be located at different height positions when suspended in the blast furnace by the hanging wire 11. and placed at desired height positions. A pressure medium such as air is pressurized into the expansion members 30a, 30b, 30c, 30d, and 30e via pressure medium introduction pipes 31a, 31b, 31c, 31d, and 31e, respectively.

Furthermore, in the third embodiment, a fall prevention member is provided between vertically adjacent expansion members. The fall prevention member 20a that is directly suspended by the hanging wire 11 is the fall prevention member in other sections, that is, the fall prevention member 20b between the expansion members 30a and 30b, the fall prevention member 20c between the expansion members 30b and 30c, and the expansion member. The fall prevention member 20d between 30c and 30d and the fall prevention member 20e between expansion members 30d and 30e may be formed using the same material, or may be formed using different materials. For example, only the fall prevention member 20a may have a mesh structure, and all or some of the fall prevention members 20b to 20e in other sections may be formed of sheets.

Although not shown, the blast furnace interior repair tool 1 of the third embodiment may have a structure in which at least one of the expansion members 30a to 30e and fall prevention members 20b to 20e is suspended from the upper part of the furnace using a hanging wire. can.

In addition, the expansion members 30a to 30e of the blast furnace repair tool 1 of the third embodiment have a structure in which communication pipes through which pressure medium can freely flow are arranged radially between the expansion members 30 adjacent in the height direction. It's good as well. Such a simple structure may be a structure in which all adjacent inflatable members 30 of the inflatable members 30a to 30e are connected by a communication pipe, and at least one set or more of vertically adjacent inflatable members 30 are connected. A structure in which they are connected through a communication pipe may also be used.

FIG. 9 shows a modification of the expansion members 30a to 30e in which communication pipes 33a are arranged radially around the upper end 21 between the expansion members 30a and 30b adjacent to each other above and below the blast furnace repair tool 1. The drop prevention member 20b is provided in the gap surrounded by the expansion members 30a, 30b and the communication pipe 33a, but a structure in which the expansion members 30 adjacent to each other above and below the blast furnace repair tool 1 are connected by a communication pipe is provided. For the sake of clarity, the description of the fall prevention member 20b has been omitted.

<How to install repair tools inside the blast furnace>
Next, a method for installing the blast furnace repair tool according to the present invention will be explained. The method for installing a repair tool in a blast furnace according to the present invention basically includes the following steps (1) to (6). In addition, the following explanation is a method of installing the blast furnace repair tool of the second embodiment in the blast furnace, but the installation method of the blast furnace repair tool of other embodiments is basically the same as the installation method described below. is the same as

(1) First, select a location where the suspension wire is to be suspended, and introduce the attachment wire into the blast furnace from the selected location where the suspension wire is to be suspended. Specifically, as shown in FIGS. 10(A) and 10(B), the attachment wires 1121a to 1121h corresponding to the eight gas collection mantel openings 112, 112-a to 112-h, are connected to the One gas collection mantel is hung from each of the eight gas collection mantel openings 112.

The method for installing the repair tool in the blast furnace of the second embodiment is carried out in a structure in which one hanging wire is hung from each of eight locations of the gas collection mantel opening and eight locations of the ore receiving metal fitting opening. However, the hanging wires may be hung at, for example, six or more positions symmetrically with respect to the center of the upper part of the furnace. If there are few places to suspend the hanging wire, the gap between the fall prevention member and the blast furnace inner wall tends to become large, so from the viewpoint of safety for workers below the fall prevention member, it is preferable that there are at least four places.

In addition, as in the second embodiment, when suspending the blast furnace repair tool 1 with a plurality of hanging wires via an attachment wire, the attachment wires are provided at locations on the circumference centered on the center of the upper part of the furnace. It is preferable that there be two, and it is more preferable that they are spaced at equal intervals. Further, the attachment wires may be provided at equal intervals on the circumference of concentric circles centered on the center of the upper part of the furnace. In the second embodiment, the gas collection mantel openings 112 from which the attachment wires 1121a to 1121h are suspended are located at equidistant positions on the circumference centered on the attachment portion 114 of the rotating chute in the upper furnace portion 110. They are provided at 112-a to 112-h. Further, in the second embodiment, the ore receiver attachment port 113 from which the attachment wires 1131a to 1131h are suspended is formed on the circumference of a concentric circle with respect to the positions 112-a to 112-h in the furnace upper part 110. There are eight locations 113-a to 113-h.

(2) Next, worker A, who is waiting on the deck 120 temporarily installed in the upper part of the furnace 110, moves the attachment wires 1121a to 1121h and the attachment wires 1131a to 1131h to the deck 120 side, as shown in FIG. 11(A). Attract.

(3) The worker A connects one corresponding hanging wire to each of the attachment wires. Specifically, the worker A connects the attachment wire 1111 suspended from the raw material input port 111 to the suspension wire 11, connects the suspension wires 112a to 112h to each of the attachment wires 1121a to 1121h, and Suspension wires 113a to 113h are connected to 1131a to 1131h, respectively.

As shown in FIG. 11(B), in the blast furnace repair tool 1 of the second embodiment, hanging wires 112a to 112h are attached at equal intervals on the same circumference on the fall prevention member 20, and hanging wires 113a to 112h are attached at equal intervals on the same circumference. 113h are attached to the expansion member 30 at equal intervals.

(4) The worker A draws the hanging wire to the selected location to be hung via the attachment wire. Specifically, the hanging wire 11 is drawn to the raw material input port 111 via the attachment wire so that the hanging wire 11 is suspended from the raw material input port 111 . Similarly, the hanging wires 112a to 112h and the hanging wires 113a to 113h are drawn to the positions 112-a to 112-h and the positions 113-a to 113-h, respectively, and the blast furnace repair tool 1 is placed inside the blast furnace. Be suspended.

(5) The operator A adjusts the lengths of the suspension wires 11, suspension wires 112a to 112h, and suspension wires 113a to 113h in the blast furnace until the expansion member 30 reaches a desired height.

(6) After the expansion member 30 reaches the desired height, press-fitting of a pressure medium such as air into the expansion member 30 is started as shown in FIG. The operator A presses a pressure medium such as air into the expansion member 30 until the expansion member 30 contacts the inner wall of the blast furnace. The pressure inside the expansion member 30 can be adjusted using a press-fitting device 150 having a pressure indicating device 150a and a pressure regulating valve 150b. For example, the operator A may gradually open the pressure regulating valve 150b while looking at the pressure indicating device 150a to introduce air at a pressure of 1 MPa or less.

After confirming that the expansion member 30 has expanded until it contacts the blast furnace inner wall at a desired height, the operator A fully closes the pressure regulating valve 150b. Note that the pressure regulating valve 150b may be provided with a pressure regulator (not shown) to control the pressure inside the expansion member 30 to be constant.

Furthermore, support wires 25a and 25b are provided at the lower end of the fall prevention member 20. One ends of the support wires 25a, 25b can be led out to the outside of the blast furnace through openings 40a, 40b provided on the side surface of the blast furnace, and can be attached and fixed to the side surface of the blast furnace from the outside.

In order to change the height direction position of the blast furnace repair tool 1, after reducing the pressure in the expansion member 30 by reducing the pressure while watching the pressure indicating device 150a, move the blast furnace repair tool 1 to the desired position. All you have to do is move it to the height of . Next, by performing the step of expanding the expansion member 30 again at the height position after the movement, the blast furnace repair tool 1 can be moved to the desired height position even if the inner diameter of the blast furnace changes depending on the height of the blast furnace. can be stably placed. In addition, in the conventional technology, a lower safety net and an upper safety net may be installed depending on the work stage, but the blast furnace auxiliary tool 1 of the present invention can be used as both the lower safety net and the upper safety net. can.

According to the present invention, it is possible to reduce the number of man-hours required of workers for installation, reduce the work that should be considered in terms of labor safety, improve work efficiency, and shorten the period for refurbishing a blast furnace. possible.

1 Blast furnace repair tools 11 Hanging wire 20 Fall prevention members 20a to 20e Fall prevention members 25a, 25b Support wire 30 Expansion members 30a to 30e Expansion member 31 Pressure medium introduction pipes 31a to 31e Pressure medium introduction pipe 33a Communication pipes 40a, 40b Blast furnace Openings provided on the side surface 100 Blast furnace 110 Furnace upper part 111 Raw material inlet 112 Gas collection mantel openings 112a to 112h Hanging wire 113 Ore receiver attachment ports 113a to 113h Hanging wire 114 Swivel chute attachment portion 120 Deck 150 Press-in device 150a Pressure indicating device 150b Pressure regulating valves 1121a to 1121h Mounting wires 1131a to 1131h provided in gas collection mantel openings 112 (112-a to 112-h) Ore receiver mounting ports 113 (113-a to 113-h) ) mounting wire provided on

Claims (22)

A blast furnace repair tool that is suspended from the upper part of the blast furnace into the blast furnace via a hanging wire,
a fall prevention member connected to the hanging wire;
an expansion member attached to the fall prevention member and into which a pressure medium is introduced;
The suspension wire includes one or more suspension wires coupled to the upper end of the fall prevention member, and a plurality of suspension wires coupled to or near the expansion member,
The blast furnace repair tool is characterized in that the expansion member expands when a pressure medium is injected into the inside of the expansion member so as to be in contact with the entire circumference of the blast furnace inner wall. The blast furnace interior repair tool according to claim 1, wherein the expansion member is provided at a lower end of the fall prevention member. The blast furnace interior repair tool according to claim 1 or 2, wherein a plurality of said expansion members are provided. The blast furnace interior repair tool according to any one of claims 1 to 3, wherein the expansion member expands and contracts in a bellows shape. The blast furnace interior repair tool according to any one of claims 1 to 4, wherein the expansion member is made of lightweight fiber. The blast furnace interior repair tool according to any one of claims 1 to 5, wherein the fall prevention member is a sheet-like member. The blast furnace interior repair tool according to any one of claims 1 to 5, wherein the fall prevention member is a net-like member. Any one of claims 1 to 5, wherein the fall prevention member comprises a net-like member and a sheet-like member, and the net-like member is partially or entirely covered with the sheet-like member. Blast furnace repair tools listed in section. The blast furnace repair tool according to claim 7 or 8, wherein the mesh of the net-like member is 1 mm or more and 50 mm or less. The blast furnace interior repair tool according to any one of claims 6 to 9, wherein the fall prevention member is made of lightweight fiber. The blast furnace interior repair tool according to any one of claims 6 to 10, wherein the fall prevention member includes a support wire that is coupled to a side surface of the blast furnace. A method for installing a repair tool in a blast furnace according to any one of claims 1 to 11, comprising:
suspending mounting wires corresponding to each of the hanging wires from the top of the blast furnace;
each of the suspension wires being coupled to the attachment wire;
suspending the blast furnace repair tool in the blast furnace via the attachment wire and the hanging wire;
A method for installing a repair tool in a blast furnace, comprising the step of pressurizing a pressure medium into the expansion member and expanding the expansion member so as to contact the inner wall of the blast furnace. 13. The method of installing a repair tool in a blast furnace according to claim 12, wherein the attachment wire is attached to the center of the upper part of the blast furnace. 14. The method for installing a repair tool in a blast furnace according to claim 12 or 13, wherein the attachment wire is attached on a single circumference centered on the center of the upper part of the blast furnace. 14. The method for installing a repair tool in a blast furnace according to claim 12 or 13, wherein the attachment wire is attached on the circumference of a plurality of concentric circles centered on the center of the upper part of the blast furnace. The method for installing a repair tool in a blast furnace according to claim 14 or 15, wherein the attachment wires are attached at equal intervals on the circumference. 16. The method for installing a repair tool in a blast furnace according to claim 15, wherein the attachment wire is attached to a raw material input port, a gas collection mantel opening, and an ore receiver attachment port. The method for installing a repair tool in a blast furnace according to claim 14 or 15, wherein the attachment wires are attached at at least six locations on the same circumference. A support wire is provided on the fall prevention member,
The method for installing a repair tool in a blast furnace according to any one of claims 12 to 18, characterized in that the support wire is attached to a side surface of the blast furnace. 13. The method for installing a repair tool in a blast furnace according to claim 12, characterized in that air is introduced into the expansion member at room temperature and atmospheric pressure at a pressure of 1 MPa or less. 13. The method for installing a repair tool in a blast furnace according to claim 12, wherein the pressure medium is press-fitted into the expansion member using a press-fitting device having a pressure indication value and a pressure regulating valve. After the step of expanding the expansion member so as to contact the inner wall of the blast furnace,
The method further includes the step of reducing the pressure of the expansion member, changing the height direction position of the blast furnace repair tool, and expanding the expansion member again at the changed height direction position of the blast furnace repair tool. The method for installing a repair tool in a blast furnace according to any one of claims 12 to 21, characterized in that:

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