Method for dismantling and removing pig iron ingots inside a mixed iron truck

Abstract

This invention provides a method for dismantling and removing solidified pig iron masses accumulated inside a pig iron mixing vehicle, enabling more efficient and shorter removal times. [Solution] The method includes a core-removal step in which the pig iron mass 40 is core-removed in a cylindrical shape in the area directly below the tapping port 51c to form a core-removal vertical cavity 41 that penetrates the pig iron mass 40 vertically, and a splitting and removal step in which multiple vertical pressure holes 43 penetrating in the vertical direction and vertical pressure holes 44 extending in the horizontal direction Y are drilled into the pig iron mass 40 remaining around the core-removal vertical cavity 41 at predetermined intervals from the core-removal vertical cavity 41, and outward pressure is applied to these formed pressure holes 43, 44, thereby splitting the pig iron mass 40 with the inner surface 41a of the core-removal vertical cavity 41 as a free surface, and the split pieces 40b are dismantled and removed toward the core-removal vertical cavity 41.

Description

Technical Field

[0001] The present invention relates to a method for disassembling and removing solidified pig iron lumps deposited inside a hot metal mixer, for disassembling and removing the pig iron lumps inside the hot metal mixer.

Background Art

[0002] For example, in a steelworks, hot metal obtained by melting pig iron is transported by a hot metal mixer, also called a torpedo car (TPC), from, for example, a blast furnace plant to a steelmaking plant, and preferably undergoes preliminary treatment to remove impurities such as desiliconization treatment, dephosphorization treatment, and desulfurization treatment during transportation inside the hot metal mixer. After transportation, the hot metal is discharged from a tapping hole arranged in the central part of the hot metal mixer. However, the hot metal that could not be completely discharged will solidify and accumulate inside as pig iron lumps.

[0003] Also, for example, when a power outage occurs due to natural disasters such as earthquakes or lightning strikes, the operation in the factory may be temporarily stopped for safety reasons. At this time, the hot metal contained inside will cool and solidify, and accumulate inside as pig iron lumps. As the solidified pig iron lumps accumulate inside, the capacity of the hot metal that can be transported by the hot metal mixer decreases. Therefore, it has been proposed to remove the pig iron lumps deposited inside the hot metal mixer to restore the transportation volume (see, for example, Patent Document 1).

[0004] Conventional methods for removing pig iron ingots preferably involve pouring new molten iron from the taphole and discharging the solidified and accumulated pig iron ingots by the heat of the poured molten iron. However, with such removal methods, depending on the height of the accumulated pig iron ingots, the space for pouring molten iron inside the mixing truck is limited, making it difficult to pour in a sufficient amount of molten iron to melt the pig iron ingots. For these reasons, the method for removing pig iron ingots described in Patent Document 1 involves the following steps: forming multiple interconnected holes of a predetermined depth from the top to the bottom of the pig iron ingot through the tapping port of a molten iron mixer, so as to surround the entire cylindrical area to be removed in an annular shape when viewed from above; cutting the area to be removed from the pig iron ingot horizontally using a wire saw through the bottom of the interconnected holes; and pulling up and removing the area to be removed from the pig iron ingot above the cut bottom. These steps form a bottomed cylindrical cavity in the accumulated pig iron ingot, thereby expanding the space into which molten iron can be poured.

[0005] Furthermore, since the mixing truck is a special, dedicated piece of equipment developed and manufactured to efficiently transport molten iron at individual factories, preferably while performing preliminary processing, and is also expensive, the method for removing pig iron ingots described in Patent Document 1 involves removing the required amount of accumulated pig iron ingots, then appropriately repairing the mixing truck for reuse. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2022-36656 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, the method for removing pig iron lumps described in Patent Document 1 requires considerable effort to cut horizontally the pig iron lumps accumulated inside the mixing truck through the bottom of the continuously formed holes using a wire saw. Furthermore, even if the space for pouring molten iron is expanded by forming a bottomed cylindrical cavity, the heat of the poured molten iron alone is insufficient to melt a small amount of pig iron lumps in a single pour. Therefore, in order to remove as many solidified pig iron lumps as possible accumulated inside the mixing truck, the work must be repeated over a long period of time. For this reason, there is a need for the development of a new technology that can remove solidified pig iron lumps accumulated inside the mixing truck more efficiently and in a shorter period of time.

[0008] The present invention aims to provide a method for dismantling and removing pig iron lumps that have accumulated in a solidified state inside a pig iron mixing vehicle, which can be removed more efficiently and in a shorter time. [Means for solving the problem]

[0009] The present invention relates to a method for dismantling and removing a solidified mass of pig iron accumulated inside a pig iron mixing truck, comprising: a core-removal step in which the pig iron mass is core-removed in a columnar shape to a depth from the upper end to the lower end of the pig iron mass in the region directly below the tapping port provided on the upper surface of the central part in the longitudinal direction of the pig iron mixing truck, thereby forming a core-removal vertical cavity that penetrates the pig iron mass vertically; and a vertical pressure hole that penetrates the pig iron mass in the vertical direction in the remaining pig iron mass around the core-removal vertical cavity at a predetermined distance from the core-removal vertical cavity. The above objective is achieved by providing a method for dismantling and removing a pig iron mass inside a pig iron mixer, which includes a splitting and removal step, comprising: forming multiple holes around the core-removing vertical cavity, and / or forming multiple lateral pressure holes extending in the width direction of the pig iron mixer on a surface at a predetermined distance from the core-removing vertical cavity in the longitudinal direction of the pig iron mixer, and applying outward pressure to these formed pressure holes, thereby splitting the pig iron mass and removing the split pieces toward the core-removing vertical cavity.

[0010] Furthermore, the present invention preferably includes a vertical cavity widening step, in which the core-removing vertical cavity formed in the area directly below the tapping port of the pig-mixing vehicle is widened in the lateral direction to the side walls on both sides of the pig-mixing vehicle, thereby forming a widened cavity.

[0011] Furthermore, in the method for dismantling and removing a pig iron mass inside a pig iron mixing vehicle of the present invention, it is preferable that the widened cavity portion is formed by widening the coreless vertical cavity portion to the side wall portions on both sides, through a vertical groove forming step, in which a vertical groove is formed in the center in the longitudinal direction on the inner surface of the coreless vertical cavity, extending from the inner surface to the side wall portions on both sides in the lateral direction, and a plurality of vertical pressure holes are drilled at predetermined intervals on both sides in the longitudinal direction from the formed vertical groove, penetrating the remaining pig iron mass in the vertical direction, and / or a plurality of lateral pressure holes are drilled between the coreless vertical cavity portion and the side wall portion in the lateral direction, and by applying outward pressure to these formed pressure holes, the inner surface of the vertical groove becomes a free surface, and the widened portion splitting and removal step is performed to dismantle and remove the split pieces that have been split from the pig iron mass toward the vertical groove side.

[0012] Furthermore, the present invention's method for dismantling and removing pig iron in a pig iron mixer involves, after the vertical cavity widening step, drilling multiple vertical pressure holes that penetrate vertically into the pig iron ingots remaining on both sides of the core-removed vertical cavity and the widened cavity in the longitudinal direction, on surfaces spaced at predetermined intervals in the longitudinal direction from the core-removed vertical cavity and the widened cavity, and / or extending horizontally between the side wall portions on both sides of the pig iron mixer in the lateral direction. Preferably, a first longitudinal splitting and removal process is performed in which a plurality of pressure holes are drilled in a vertical direction on a surface at a predetermined distance in the longitudinal direction from the core-removing vertical cavity and the cavity widening section, and by applying outward pressure to these formed pressure holes, the inner surfaces of the core-removing vertical cavity and the cavity widening section become free surfaces, and the split pieces of the pig iron mass are broken apart and removed towards the core-removing vertical cavity and the cavity widening section.

[0013] Furthermore, in the method for dismantling and removing a pig iron mass inside a pig iron mixer according to the present invention, it is preferable that, after the first longitudinal splitting and removal step, a second longitudinal splitting and removal step is performed, in which, in the pig iron mass remaining on both ends in the longitudinal direction beyond the first transverse splitting surface formed in the first longitudinal splitting and removal step, a plurality of vertical pressure holes penetrating in the vertical direction are drilled in a plane at a predetermined distance in the longitudinal direction from the first transverse splitting surface, and / or a plurality of lateral pressure holes extending in the transverse direction between the side wall portions on both sides of the pig iron mixer, a plurality of lateral pressure holes extending in the transverse direction are drilled in a plane at a predetermined distance in the longitudinal direction from the first transverse splitting surface, and a second longitudinal splitting and removal step is performed, in which the split mass obtained by splitting the pig iron mass with the first transverse splitting surface as a free surface is dismantled and removed toward the core-removed vertical hole cavity and the cavity widening portion.

[0014] Furthermore, the present invention preferably includes a method for dismantling and removing pig iron lumps inside a pig iron mixing vehicle, in which the lumps that have been split in the first longitudinal splitting and removal step and / or the second longitudinal splitting and removal step are further broken into smaller pieces inside the pig iron mixing vehicle that can be transported out through the tapping port.

[0015] Furthermore, in the method for dismantling and removing pig iron in a pig iron mixer according to the present invention, it is preferable that the pressurizing means that applies outward pressure to the vertical pressurizing holes or the horizontal pressurizing holes is a jack or blasting.

[0016] Furthermore, in the method for dismantling and removing a pig iron mass inside a pig iron mixing vehicle according to the present invention, it is preferable that in the core removal step, the pig iron mass is cored out in a cylindrical shape to a depth from the upper end to the lower end of the pig iron mass and then removed. [Effects of the Invention]

[0017] According to the present invention's method for dismantling and removing pig iron lumps inside a pig iron mixing vehicle, pig iron lumps that have accumulated in a solidified state inside the pig iron mixing vehicle can be removed more efficiently and in a shorter period of time. [Brief explanation of the drawing]

[0018] [Figure 1] It is a schematic longitudinal sectional view seen from the width direction perpendicular to the length direction of the mixing mill for explaining the mixing mill in which pig iron lumps deposited inside are removed by the method for disassembling and removing pig iron lumps according to a preferred embodiment of the present invention. [Figure 2] It is a schematic cross-sectional view seen from the length direction of the mixing mill for explaining the mixing mill in which pig iron lumps deposited inside are removed by the method for disassembling and removing pig iron lumps according to a preferred embodiment of the present invention. [Figure 3] It is a schematic top view of the pig iron lumps deposited inside the mixing mill for explaining a situation where a plurality of perforations drilled in the vertical direction are formed continuously along a circular cut line in the core drilling process. [Figure 4] It is a schematic longitudinal sectional view for explaining a situation where the pig iron lumps are core-drilled into a columnar shape and removed in the core drilling process. [Figure 5] It is a schematic top view of the pig iron lumps deposited inside the mixing mill for explaining the core-drilled vertical hole cavity formed in the core drilling process. [Figure 6] It is a schematic sectional view of the main part along A-A of FIG. 2 for explaining the vertical hole cavity widening process carried out after the pig iron lumps are core-drilled into a columnar shape and removed. [Figure 7] It is a schematic top view of the pig iron lumps deposited inside the mixing mill for explaining the vertical groove forming process of the vertical hole cavity widening process. [Figure 8] It is a schematic top view of the pig iron lumps deposited inside the mixing mill for explaining the widened part splitting and removing process of the vertical hole cavity widening process. [Figure 9] It is a schematic top view of the pig iron lumps deposited inside the mixing mill for explaining the first length direction splitting and removing process carried out after forming the cavity widened part in the vertical hole cavity widening process. [Figure 10] It is a schematic front view for explaining a situation where a pressure hole extending in the width direction between the side wall parts on both sides of the mixing mill is drilled and formed in the first length direction splitting and removing process and the second length direction splitting and removing process. [Figure 11]A schematic longitudinal sectional view taken along line B-B of FIG. 9 for explaining the first lengthwise splitting and removal process carried out after forming a cavity widening portion in the vertical hole cavity widening process. [Figure 12] A schematic cross-sectional view taken along line C-C of FIG. 9 for explaining the first lengthwise splitting and removal process carried out after forming a cavity widening portion in the vertical hole cavity widening process. [Figure 13] A schematic longitudinal sectional view taken along line B-B of FIG. 9 for explaining the second lengthwise splitting and removal process carried out after forming a first widthwise splitting surface in the first lengthwise splitting and removal process. [Figure 14] (a) to (d) are schematic longitudinal sectional views taken along line B-B of FIG. 9 for explaining the situation of removing split pieces split in the first lengthwise splitting and removal process and the second lengthwise splitting and removal process. [Figure 15] A schematic cross-sectional view taken along line C-C of FIG. 9 for exemplifying another form of the pressure hole formed by extending and boring between the side wall portions on both sides of the milling vehicle in the first lengthwise splitting and removal process and the second lengthwise splitting and removal process. [Figure 16] A schematic top view of the pig iron lumps deposited inside the milling vehicle for exemplifying another form of the splitting and removal process.

Embodiments for Carrying out the Invention

[0019] The method for disassembling and removing pig iron lumps according to a preferred embodiment of the present invention is used in a steelworks or the like as a method for disassembling and removing the solidified pig iron lumps 40 deposited in a solidified state inside the furnace body 51 of the milling vehicle 50 shown in FIGS. 1 and 2, which conveys molten pig iron from, for example, a blast furnace plant to a steelmaking plant. In the disassembling and removing method of this embodiment, the part other than the tapping hole 51c is surrounded by the outer casing 51a and the refractory bricks 51b, and by being deposited inside the furnace body 51 which is a closed space all around, the free surface becomes only the upper surface portion 40a, and the solidified pig iron lumps 40 which are difficult to disassemble can be disassembled and removed efficiently and in a short period of time.

[0020] Furthermore, the method for dismantling and removing a pig iron mass in a mixing truck according to this embodiment is a method for dismantling and removing a pig iron mass 40 that is solidified and accumulated inside the furnace body 51 of a mixing truck 50, and comprises a core-removal step (see Figures 1 to 5) in which the pig iron mass 51 is preferably core-removed into a cylindrical column shape to a depth from the upper end to the lower end of the pig iron mass 40, thereby forming a core-removal vertical cavity 41 that penetrates the pig iron mass 40 vertically, and a vertical pressure hole 43 that penetrates the pig iron mass 40 vertically, in the pig iron mass 40 remaining around the core-removal vertical cavity 41. The system includes a splitting and removal process (see Figures 14(a), (b)) in which multiple holes are drilled around the core-removing vertical cavity 41 at predetermined intervals from the core-removing vertical cavity 41 (see Figure 16), and / or multiple lateral pressure holes 44 are drilled on a surface 46a of the furnace body 51 of the iron mixing truck 50 at predetermined intervals in the longitudinal direction X from the core-removing vertical cavity 41, extending in the lateral direction Y of the furnace body 51 of the iron mixing truck 50 (see Figures 9 to 12), and by applying outward pressure to these formed pressure holes 43, 44, the inner surface 41a of the core-removing vertical cavity 41 becomes a free surface, and the split pieces 40b of the pig iron mass 40 are broken down and removed towards the core-removing vertical cavity 41.

[0021] Furthermore, in the method for dismantling and removing a pig iron mass inside a pig iron mixer according to this embodiment, preferably as shown in Figures 6 to 9, the method includes a vertical hole widening step in which the core-removing vertical hole cavity 41 formed in the area directly below the tapping port 51c of the furnace body 51 of the pig iron mixer is widened in the lateral direction Y to the side wall portions 51d on both sides of the furnace body 51 of the pig iron mixer, thereby forming a widened cavity 42.

[0022] In the vertical cavity widening process, preferably, a vertical groove forming process (see Figures 6 and 7) is performed to form a vertical groove 45 in the center of the length direction X on the inner surface 41a of the coreless vertical cavity 41, extending from the inner surface 41a to the side wall portions 51d on both sides in the width direction Y. This process involves drilling multiple vertical pressure holes 43 at predetermined intervals on both sides in the length direction X from the formed vertical groove 45, penetrating the remaining pig iron mass 40 in the vertical direction, and applying outward pressure to these pressure holes 43, thereby creating a free surface on the inner surface 45a of the vertical groove 45. The resulting split pieces 40b are then dismantled and removed towards the vertical groove 45 side, thereby widening the coreless vertical cavity 41 to the side wall portions 51d on both sides, forming the widened cavity 42 described above.

[0023] In this embodiment, the torpedo car 50, in which solidified pig iron ingots 51 are deposited inside, is a known trolley used to transport molten iron tapped from a blast furnace to a molten iron pretreatment facility for removing impurities or to a converter plant for producing molten steel, as shown in Figures 1, 2, and 10. Since it moves using a railway track 55a (see Figure 10), it is equipped with a bogie trolley 55 (see Figure 10) at the bottom. A furnace body 51, which is a heat-resistant container shaped like a torpedo (cylindrical in the center and conical at both ends), is installed on the bogie trolley 55. The furnace body 51 is composed of, for example, an outer shell 51a made of steel plate and refractory bricks 51b lined inside the outer shell 51a (see Figures 1 and 2). A circular tapping port 51c, for example with a diameter of about 1700 mm, is formed in the upper central part of the furnace body 51. The molten iron received (tipped) from the tapping port 51c is transported to, for example, a converter plant, and then the furnace body 51 is rotated so that the tapping port 51c faces downwards, allowing the molten iron to be discharged (tipped).

[0024] Furthermore, when molten iron is transported inside the mixing truck 50, any molten iron adhering to the inside after tapping will remain, and this remaining molten iron will accumulate as solidified pig iron ingots (metal) 40. Even if the truck becomes unable to move or tap for any reason during transport, the contained molten iron will accumulate inside as solidified pig iron ingots (metal) 40. The pig iron ingots 40 accumulated inside in this way reduce the capacity of the furnace body 51 of the mixing truck 50, and therefore need to be dismantled and removed.

[0025] In this embodiment, when dismantling and removing the pig iron mass 40 that has accumulated in a solidified state inside the furnace body 51 of the mixing truck 50, a hollow core-removed vertical hole cavity 41, preferably cylindrical, is formed in advance as a hollow core-removed portion in the pig iron mass 40 in the area directly below the taphole 51c, and the pig iron mass 40 is dismantled efficiently by following this.

[0026] In the core removal step of the pig iron mass dismantling and removal method of this embodiment, as shown in Figures 1 and 2, preferably using the pig iron drilling device 10 described in Japanese Patent Application No. 2024-230942, filed on the same date as this application, multiple interconnected holes 22 can be formed in the upper surface 40a of the pig iron mass 40, along a planned circular cut line 21 (see Figure 3), extending vertically from the upper surface 40a to the lower end of the pig iron mass 40. In other words, the pig iron drilling device 10 comprises a lower fixing plate-shaped metal fitting 11 which is preferably fixed to the upper surface 40a of the pig iron mass 40 via a central anchor member 20 or the like, an upper swivel plate-shaped metal fitting 12 which is rotatably superimposed on the lower fixing plate-shaped metal fitting 11 with a rotational slide mechanism interposed between it and the lower fixing plate-shaped metal fitting 11, and a drilling device 15 which is installed on the upper swivel plate-shaped metal fitting 12 and includes a drilling machine 13 and a guide mast 14. The upper swivel plate-shaped metal fitting 12 is rotatably locked to a central anchor member 20 which is fixed to the center of a circular cut line 21, and is mounted to rotate around the central anchor member 20. The drilling device 15 is designed to slide the drilling machine 13 up and down, guided by the guide mast 14, and rotates the upper swivel plate-shaped metal fitting 12 at predetermined angles, so that multiple holes 22 are drilled vertically down to the lower end of the pig iron mass 40, and are formed in a ring-like pattern along the circular cut line 21, as shown in Figure 3.

[0027] Furthermore, in the core removal process, once multiple perforations 22 are formed in a circular pattern along a circular cut line 21, as shown in Figures 4 and 5, preferably in the area directly below the tapping port 51c located on the upper surface of the central part of the longitudinal X direction of the furnace body 51 of the mixing wheel 50, the pig iron mass 40 is removed by core removal, preferably in a cylindrical shape, to a depth from the upper surface 40a to the lower end, thereby forming a core removal vertical cavity 41 that penetrates the pig iron mass 40 vertically. That is, for example, the drilling device 15 is removed and the upper rotating plate-shaped metal fitting 12 is removed, and the lifting jig 58 is welded and joined to a predetermined position on the upper surface of the exposed lower fixing plate-shaped metal fitting 11 (see Figure 6). By connecting, for example, the lower end of the lifting wire 60 to the joined lifting jig 58, and securing the upper end of the lifting wire 60 to, for example, a lifting device 57 using a hook member, it becomes possible to lift and remove the pig iron mass 40' in the inner region via the lifting jig 58, for example, by a crane.

[0028] In this embodiment, in the core removal process, once a core removal vertical cavity 41 is formed in the pig iron mass 40 in the area directly below the tapping port 51c, preferably prior to the first longitudinal splitting and removal process and the second longitudinal splitting and removal process described later, the above-described vertical cavity widening process is carried out to widen the core removal vertical cavity 41 in the lateral width direction Y perpendicular to the longitudinal direction X of the furnace body 51 of the mixing wheel 50.

[0029] In other words, in the vertical cavity widening process, in the vertical groove forming process of the vertical cavity widening process, as shown in Figures 6 and 7, preferably in the center of the length direction X on the inner surface 41a of the coreless vertical cavity 41, a known drilling device is used to drill multiple holes in a vertical direction, extending toward each of the side wall portions 51d on both sides in the width direction Y, so as to overlap the lower and upper ends of the holes. This creates a vertical groove 45 in which these multiple holes are continuous in the vertical direction, traversing the center of the length direction X in the coreless vertical cavity 41 in the width direction Y. The vertical groove 45 can also be formed by working from inside the hollow core-punched vertical cavity 41, for example, by using a known heating means such as a jet lance to dissolve the pig iron mass 40 between the inner surface 41a and the side wall portion 51d in the central part of the core-punched vertical cavity 41 in the longitudinal direction X.

[0030] Furthermore, in the widening section splitting and removal process of the vertical cavity widening process, as shown in Figure 8, multiple vertical pressure holes 43 are drilled from the vertical groove 45 formed in the vertical groove formation process on both sides in the length direction X at predetermined intervals of, for example, about 600 to 800 mm, using a known drilling device, by working from the upper surface 40a of the pig iron mass 40, to penetrate the remaining pig iron mass 40 in the vertical direction. Subsequently, by applying outward pressure to these formed pressure holes 43, preferably by known pressurizing means such as jacks or blasting, the pig iron mass 40 is split with the inner surface 45a of the vertical groove 45 as a free surface, and the split pieces 40b are dismantled toward the vertical groove 45 side and removed through the tapping port 51c. This makes it possible to form a cavity widening section 42 by widening the core-removed vertical cavity 41 in the lateral direction Y to the side wall portions 51d on both sides (see Figure 9).

[0031] Here, in the widening section splitting and removal process of the vertical cavity widening process, for example, along surfaces spaced at predetermined intervals on both sides in the longitudinal direction X from the vertical groove 45 formed in the vertical groove forming process, a known drilling device is used to drill multiple lateral pressure holes 44 that penetrate the pig iron mass 40 remaining between the coreless vertical cavity 21 and the side wall portion 51d in the lateral width direction Y, arranged vertically. By applying outward pressure to these formed pressure holes 44, the inner surface 45a of the vertical groove 45 becomes a free surface, and the split pieces 40b of the pig iron mass 40 are broken apart and removed towards the vertical groove 45.

[0032] In this embodiment, after the vertical cavity widening process, as shown in Figures 10 to 12, horizontal pressure holes 44 are made on the pig iron mass 40 remaining on both sides in the longitudinal direction X of the core-removed vertical cavity 41 and the cavity widened section 42, extending in the lateral width direction Y between the side wall portions 51d on both sides of the furnace body 51 of the mixing cart 50, for example, on a surface 46 preferably at a predetermined distance of about 650 to 850 mm in the longitudinal direction X from the core-removed vertical cavity 41 and the cavity widened section 42. In (see Figure 11), preferably, multiple holes are drilled in parallel in the vertical direction, and by applying outward pressure to these formed pressure holes 44, a first longitudinal splitting and removal process is performed in which the split pieces 40b, which are created by splitting the pig iron mass 40, are dismantled and removed toward the core-removed vertical hole cavity 41 and the cavity-widening section 42, with the inner surfaces 41a and 42a of the core-removed vertical hole cavity 41 and the cavity-widening section 42 being free surfaces.

[0033] In other words, in the first longitudinal splitting and removal process, a known drilling device 60, for example, as shown in Figure 10, is used to drill multiple lateral pressure holes 44, each with a hole diameter of approximately Φ50 to Φ65, from the outside of the side wall portion 51d of the furnace body 51 of the pig iron mixer 50, on a surface 46a (see Figure 11) at a predetermined interval in the longitudinal direction X from the core-removing vertical hole cavity 41 and cavity widening portion 42, penetrating the outer shell 51a and refractory bricks 51b of the side wall portion 51d of the furnace body 51, and extending in the lateral width direction Y within the pig iron mass 40, so as not to let the force of the loaded explosives 44a escape, preferably up to just before the refractory bricks 51b of the opposite side wall portion 51d, preferably arranged parallel to each other in the vertical direction at a pitch of approximately 150 to 300 mm.

[0034] Furthermore, in this embodiment, in the first longitudinal splitting and removal process, explosives 44a are preferably loaded from the central portion to just before the tip of the lateral pressure hole 44 formed on a surface 46a at a predetermined distance in the longitudinal direction X from the core-removed vertical cavity 41 and the cavity-widening portion 42, so that the pig iron mass 40 is split by blasting. After the pig iron mass 40 is split by blasting, a first lateral splitting surface 47 (see Figures 13 and 4(b)) is formed on the surface 46a at a predetermined distance in the longitudinal direction X from the core-removed vertical cavity 41 and the cavity-widening portion 42.

[0035] In this embodiment, the pressurizing means for splitting the pig iron mass 40 along a surface 46a at a predetermined distance in the longitudinal direction X from the core-removed vertical cavity 41 and the cavity-widening section 42 in the first longitudinal splitting and removal step is blasting using explosives 44a loaded into the tip portion of the lateral pressurizing hole 44. However, the pressurizing means can also be a known jack attached to the lateral pressurizing hole 44. In this case, the lateral pressurizing holes 44, which are formed in multiple locations on the surface 46a (see Figure 11) at a predetermined distance in the longitudinal direction X from the core-removed vertical cavity 41 and the cavity-widening section 42, preferably arranged parallel to each other in the vertical direction, are preferably provided at a pitch of about 120 mm or less.

[0036] In this embodiment, further, after the first longitudinal splitting and removal process, as shown in Figures 13 and 14(c) and (d), a lateral pressure hole 44 is made between the side wall portions 51d on both sides of the furnace body 51 of the mixing truck 50 and the pig iron mass 40 remaining on both ends in the longitudinal direction X of the furnace body 51 of the mixing truck 50, relative to the first lateral splitting surface 47 (see Figure 14(b)) formed in the first longitudinal splitting and removal process, for example, 500 to 10 in the longitudinal direction X from the first lateral splitting surface 47 In a second longitudinal splitting and removal process, a surface 46b (see Figure 13) with predetermined intervals of approximately 00 mm is formed, preferably in parallel in the vertical direction, similar to the first longitudinal splitting and removal process. By applying outward pressure to these formed pressure holes 44, the first lateral splitting surface 47 becomes a free surface, and the split pieces 40b of the pig iron mass 40 are dismantled and removed towards the core-removed vertical cavity 41 and the cavity widening section 42.

[0037] In other words, in the second longitudinal splitting and removal process, similar to the first longitudinal splitting and removal process, a known drilling device 60, for example, as shown in Figure 10, is used to drill multiple lateral pressure holes 44, each with a hole diameter of approximately Φ50 to Φ65, from the outside of the side wall portion 51d of the furnace body 51 of the iron mixing truck 50, on a surface 46b (see Figure 13) at a predetermined interval in the longitudinal direction X from the first lateral splitting surface 47. These holes penetrate the outer shell 51a and refractory bricks 51b of the side wall portion 51d of the furnace body 51, and extend in the lateral direction Y within the pig iron mass 40. This process is performed to prevent the force of the explosive 44a loaded at the tip portion from escaping, preferably up to just before the refractory bricks 51b on the opposite side wall portion 51d, preferably arranged parallel to each other in the vertical direction at a pitch of approximately 150 to 300 mm (see Figure 12).

[0038] Furthermore, in this embodiment, in the second longitudinal splitting and removal step, explosives 44a are loaded into the tip portion of the lateral pressure hole 44 formed on a surface 46b at a predetermined distance in the longitudinal direction X from the first lateral splitting surface 47, similar to the first longitudinal splitting and removal step, so that the pig iron mass 40 is split by blasting. After the pig iron mass 40 is split by blasting, a second lateral splitting surface 48 is formed on the surface 46b at a predetermined distance in the longitudinal direction X from the first lateral splitting surface 47 (see Figure 14(c)).

[0039] In this embodiment, after the second longitudinal splitting and removal process, if necessary, lateral pressure holes 44 are made between the side wall portions 51d on both sides of the furnace body 51 of the mixing truck 50, extending in the lateral direction Y, with respect to the pig iron mass 40 remaining on both ends in the longitudinal direction X of the furnace body 51 of the mixing truck 50, at a predetermined distance of, for example, about 1000 mm from the second lateral splitting surface 48 in the longitudinal direction X, similar to the second longitudinal splitting and removal process. On surfaces 46c and 46d (see Figures 13 and 14(c)), a process similar to the second longitudinal splitting and removal process is carried out, preferably by drilling multiple holes parallel to each other in the vertical direction, and by applying outward pressure to these formed pressure holes 44, the split pieces 40b of the pig iron mass 40 are dismantled and removed towards the core-removed vertical cavity 41 and cavity widening section 42, with the second lateral splitting surface 48 etc. being a free surface.

[0040] A process similar to this second longitudinal splitting and removal process is repeated as needed until the remaining pig iron masses 40'' at both ends in the longitudinal direction X of the furnace body 51 of the pig mixing truck 50 are removed, as shown in Figure 14(d). Finally, the remaining pig iron masses 40'' at both ends are removed, making it possible to remove the pig iron masses 40 that have solidified and accumulated inside the furnace body 51 of the pig mixing truck 50.

[0041] In this embodiment, the first longitudinal splitting and removal process, the second longitudinal splitting and removal process, and the split pieces 40b split in the same process as the second longitudinal splitting and removal process are each transported out of the mixing truck 50 through the tapping port 51c and removed together with the pig iron lumps 40'' at both ends (see Figures 14(b) to (c)). For example, each split piece 40b and the pig iron lumps 40'' at both ends are transported out of the tapping port If the fragments are too large to be removed from 51c, a smaller fragmentation process is preferably carried out inside the mixing truck 50 to break the fragments 40b or pig iron mass 40'' into smaller pieces that can be removed through the tapping port 51c. In this smaller fragmented state, the fragments 40b or pig iron mass 40'' can then be removed from the mixing truck 50 through the tapping port 51c (see Figures 14(b) and (c)).

[0042] As a result, according to the method for dismantling and removing pig iron lumps inside a pig iron mixing vehicle of this embodiment, the pig iron lumps 40 that are accumulated in a solidified state inside the pig iron mixing vehicle 50 can be broken into fragmented lumps 40b on the side of the core-removed vertical hole cavity 41, thereby making it possible to remove them more efficiently and in a shorter period of time.

[0043] It should be noted that the present invention is not limited to the above embodiments and can be modified in various ways. For example, in the first longitudinal splitting and removal process and the second longitudinal splitting and removal process, it is not always necessary to drill multiple lateral pressure holes in a vertical line in the core-removed vertical cavity and cavity widening section, or on a surface at a predetermined distance from the first lateral splitting surface. Instead, multiple vertical pressure holes penetrating vertically can be drilled in a horizontal line in the core-removed vertical cavity and cavity widening section, or on a surface at a predetermined distance from the first lateral splitting surface. By applying outward pressure to these pressure holes, the split pieces of the pig iron mass can be split and removed by dismantling them towards the core-removed vertical cavity.

[0044] Furthermore, in the first longitudinal splitting removal process and the second longitudinal splitting removal process, the core-removed vertical hole cavity and cavity widening section, and the lateral pressure holes 44 which are drilled in a vertical arrangement on surfaces 46a and 46b at predetermined intervals from the first lateral splitting surface, do not necessarily need to be formed in a state parallel to the vertical direction. For example, as shown in Figure 15, they can also be formed in a state where they are extended randomly in the lateral direction on the predetermined interval surfaces 46a and 46b and arranged in a vertical direction.

[0045] Furthermore, as shown in Figure 16, for example, without performing the above-mentioned vertical cavity widening process, in the splitting and removal process, after the core removal process, multiple vertical pressure holes 43 penetrating vertically are drilled around the core removal vertical cavity 41 at predetermined intervals from the core removal vertical cavity 41 in the pig iron mass 40 remaining around the core removal vertical cavity 41. By applying outward pressure to these formed pressure holes 43, the inner surface 41a of the core removal vertical cavity 41 becomes a free surface, and the split pieces 40b, which are formed by splitting the pig iron mass 40, can be dismantled and removed towards the core removal vertical cavity 41. [Explanation of Symbols]

[0046] 10 Pig iron drilling equipment 11 Lower fixing plate-shaped metal fittings 12 Upper swivel plate-shaped metal fitting 13 Drilling machine 14 Guide mast 15 Drilling device 40,40',40” pig iron ingot 40a Top part 40b Split mass 41 Core removal vertical hole cavity 41a Inside surface 42 Cavity widening section 43 Vertical pressure holes 44 Lateral pressure holes 44a Explosives 45 vertical grooves 45a Inside surface 46a, 46b Surfaces spaced at predetermined intervals 47 1st width split surface 48 2nd width split surface 50. Torpedo Car 51 Furnace body 51a Outer shell 51b Firebrick 51c Taphole 51d side wall part X Length direction of the iron smelting machine (furnace body) Y (Width)

Claims

1. A method for dismantling and removing solidified pig iron masses accumulated inside a pig iron mixing vehicle, In the region directly below the tapping port located on the upper surface of the central part of the lengthwise direction of the mixing truck, the core of the pig iron mass is removed by core-punching it in a columnar shape to a depth from the upper end to the lower end, thereby forming a core-punching vertical cavity that penetrates the pig iron mass vertically. A method for dismantling and removing a pig iron mass inside a pig iron mixing vehicle, comprising: a splitting and removal step, in which, in the pig iron mass remaining around the core-removing vertical cavity, a plurality of vertical pressure holes drilled around the core-removing vertical cavity, penetrating in the vertical direction, at predetermined intervals from the core-removing vertical cavity, and / or a plurality of horizontal pressure holes drilled on a surface at predetermined intervals from the core-removing vertical cavity in the longitudinal direction of the mixing vehicle, extending in the lateral direction of the mixing vehicle, and by applying outward pressure to these formed pressure holes, the pig iron mass is split, with the inner surface of the core-removing vertical cavity being a free surface, and the split pieces are dismantled and removed toward the core-removing vertical cavity.

2. A method for dismantling and removing a pig iron mass inside a pig iron mixing vehicle according to claim 1, comprising a vertical hole widening step, which involves widening the core-removing vertical hole cavity formed in the area directly below the tapping port of the pig iron mixing vehicle in the lateral width direction to the side wall portions on both sides of the pig iron mixing vehicle, thereby forming a widened cavity.

3. A method for dismantling and removing a pig iron mass in a mixing truck, according to claim 2, comprising: a vertical groove forming step of forming a vertical groove in the center of the length direction on the inner surface of the coreless vertical cavity, extending from the inner surface to the side wall portions on both sides in the width direction; and a widened section splitting and removal step of forming a split piece that penetrates the remaining pig iron mass vertically at predetermined intervals on both sides in the length direction from the formed vertical groove, and / or drilling a plurality of horizontal pressure holes that penetrate between the coreless vertical cavity and the side wall portion in the width direction, and applying outward pressure to these formed pressure holes, thereby splitting the pig iron mass with the inner surface of the vertical groove as a free surface, and dismantling and removing the split piece toward the vertical groove, thereby widening the coreless vertical cavity to the side wall portions on both sides.

4. After the process of widening the vertical cavity, multiple vertical pressure holes penetrating vertically are drilled into the pig iron mass remaining on both sides of the core-removed vertical cavity and the widened cavity in the longitudinal direction, on a surface at a predetermined distance from the core-removed vertical cavity and the widened cavity, and / or horizontal pressure holes extending in the width direction between the side wall portions on both sides of the mixing cart are drilled from the core-removed vertical cavity and the widened cavity. A method for dismantling and removing a pig iron mass in a mixed pig iron vehicle according to claim 2 or 3, wherein a first longitudinal splitting and removal step is performed, in which a plurality of holes are drilled in a plane at predetermined intervals in the longitudinal direction, arranged vertically, and pressure is applied outward to these formed pressure holes, thereby splitting the pig iron mass and removing the split pieces toward the core-removing vertical hole cavity and the cavity-widening section, with the inner surfaces of the core-removing vertical hole cavity and the cavity-widening section being free surfaces.

5. A method for dismantling and removing a pig iron mass in a mixing truck according to claim 4, wherein, after the first longitudinal splitting and removal step, a second longitudinal splitting and removal step is performed, wherein, in the pig iron mass remaining at both ends in the longitudinal direction beyond the first transverse splitting surface formed in the first longitudinal splitting and removal step, a plurality of vertical pressure holes penetrating in the vertical direction are drilled in a plane at a predetermined distance in the longitudinal direction from the first transverse splitting surface, and / or a plurality of lateral pressure holes extending in the transverse direction between the side wall portions on both sides of the mixing truck are drilled in a plane at a predetermined distance in the longitudinal direction from the first transverse splitting surface, and a plurality of lateral pressure holes extending in the transverse direction are drilled in a plane at a predetermined distance in the longitudinal direction from the first transverse splitting surface, and an outward pressure is applied to these formed pressure holes, thereby dismantling and removing the split mass obtained by splitting the pig iron mass with the first transverse splitting surface as a free surface, toward the core-removed vertical hole cavity and the cavity widening portion.

6. A method for dismantling and removing a pig iron mass inside a pig iron mixer according to claim 5, further comprising a subdivision step of subdividing the subdivision mass, which has been subdivided in the first longitudinal subdivision removal step and / or the second longitudinal subdivision removal step, into smaller pieces of a size that can be transported out through the tapping port inside the pig iron mixer.

7. The method for dismantling and removing a pig iron mass in a pig iron mixing vehicle according to claim 1 or 2, wherein the pressurizing means for applying outward pressure to the vertical pressurizing hole or the horizontal pressurizing hole is by means of a jack or blasting.

8. The method for dismantling and removing a pig iron mass in a mixed pig iron vehicle according to claim 1 or 2, wherein in the core removal step, the pig iron mass is cored into a cylindrical shape to a depth from the upper end to the lower end of the pig iron mass and removed.

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