Pig iron drilling device and method for removing pig iron mass

Abstract

The present invention provides a pig iron drilling device that, with a simple configuration, can easily form multiple vertically drilled holes in a precisely connected manner along a circular cut line. [Solution] The system comprises a lower fixing plate-shaped metal fitting 11 fixed to the inside of a circular cut line 53 on the upper surface 51a of the pig iron mass 51 via a fixing anchor member 21, an upper swivel plate-shaped metal fitting 15 rotatably superimposed on the lower fixing plate-shaped metal fitting 11 with a rotational slide mechanism 12 interposed between it and the lower fixing plate-shaped metal fitting 11, and a drilling device 18 equipped with a drilling machine 16 and a guide mast 17 installed on the upper swivel plate-shaped metal fitting 15. While rotating the upper swivel plate-shaped metal fitting 15 at predetermined angles, a plurality of drilling holes 52 are formed in a continuous manner along the circular cut line 53, drilled vertically down to the lower end of the pig iron mass 51.

Description

Technical Field

[0001] The present invention relates to a pig iron perforating device and a method for removing pig iron blocks, and more particularly, to a pig iron perforating device for forming a plurality of perforations vertically drilled in pig iron blocks deposited in a solidified state in a state where they are continuously arranged along a circular cut line, and a method for removing pig iron blocks using the pig iron perforating device.

Background Art

[0002] For example, in a steelworks, hot metal melted from 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, in the hot metal mixer, pretreatment for removing impurities such as desiliconization treatment, dephosphorization treatment, and desulfurization treatment is performed during transportation. After transportation, the hot metal is discharged from the hot metal outlet disposed at the central portion of the hot metal mixer. However, the hot metal that could not be completely discharged will solidify and accumulate inside as pig iron blocks.

[0003] Also, for example, when a power failure 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 blocks. As the solidified pig iron blocks accumulate inside, the capacity of the hot metal that can be transported by the hot metal mixer decreases. Therefore, a technique has been developed to remove the pig iron blocks deposited inside the hot metal mixer to restore the transportation volume (see, for example, Patent Document 1).

[0004] In addition, the hot metal mixer is a special dedicated product developed and manufactured in individual factories, etc., preferably capable of efficiently transporting hot metal while performing pretreatment, and is also expensive. Therefore, in the method for removing the solidified pig iron blocks inside the hot metal mixer described in Patent Document 1, after removing the required amount of the deposited pig iron blocks, the hot metal mixer is appropriately repaired so that it can be reused.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-36656 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] On the other hand, the method for removing solidified pig iron mass inside a pig iron mixing vehicle described in Patent Document 1 includes the steps of: forming multiple holes in the pig iron mass, which is accumulated in a solidified state inside the pig iron mixing vehicle, from the top surface toward the bottom to a predetermined depth, along a circular cut line set on the top surface of the pig iron mass, in a continuous manner; and cutting the lower end of the inner region surrounded by the multiple continuous holes using a wire saw, and then removing the portion above the cut lower end as the portion to be removed, by lifting it out of the pig iron mixing vehicle.

[0007] Furthermore, in the method for removing pig iron ingots described in Patent Document 1, in the step of forming multiple perforations in a series along a circular cut line, these perforations are formed by using a drilling machine, which is installed on a large temporary stage assembled to straddle the mixing cart and positioned above the tapping port formed on the upper surface of the central part of the mixing cart. The drilling machine is guided along a guide mast, and the tip bit of the drilling machine is lowered through the tapping port toward the upper surface of the pig iron ingots accumulated inside the mixing cart while drilling.

[0008] However, in the method for removing pig iron ingots described in Patent Document 1, when forming multiple holes along a circular cut line, the drilling equipment for drilling the holes must be installed on a large temporary stage assembled to straddle the mixing cart and positioned above the taphole. This requires a lot of labor and cost to assemble the temporary stage, and when drilling holes with the drilling machine's tip bit, the stress path from the drilling equipment installed on the temporary stage to the top surface of the pig iron ingot becomes long, making it difficult to obtain reaction force during drilling, and making it difficult to accurately and precisely position the drilling machine's tip bit at the predetermined position along the circular cut line.

[0009] Furthermore, when dismantling and removing pig iron lumps that have solidified and accumulated not only in a molten iron truck, but also in a molten iron ladle or blast furnace, for example, there is a need for the development of a technology that allows for the easy and precise formation of multiple vertically drilled holes in a predetermined circular cut line, without requiring the assembly of large temporary stages or the use of large drilling equipment, using a simpler configuration.

[0010] The present invention aims to provide a pig iron drilling device that can easily form multiple vertically drilled holes in a precisely connected manner along a circular cut line with a simple configuration, and a method for removing pig iron lumps using the pig iron drilling device. [Means for solving the problem]

[0011] The present invention relates to a pig iron drilling device for removing a solidified pig iron mass, which is installed on the upper surface of the pig iron mass and drills vertically, forming multiple holes in a continuous manner along a planned circular cut line, comprising: a lower fixing plate-shaped metal fitting fixed to the inside of the circular cut line on the upper surface of the pig iron mass via a fixing anchor member; an upper swivel plate-shaped metal fitting rotatably superimposed on the lower fixing plate-shaped metal fitting with a rotational slide mechanism interposed between them; and a drilling device equipped with a drilling machine and a guide mast installed on the upper swivel plate-shaped metal fitting, wherein the upper swivel plate-shaped metal fitting is The above objective is achieved by providing a pig iron drilling device in which the rotation center side portion is rotatably locked to a central anchor member fixed to the center of a circular cut line, and the outer protruding end is positioned to extend to the outside of the circular cut line, the drilling device is guided by the guide mast and slides up and down at the outer protruding end, and the upper swivel plate-shaped metal fitting is rotated at predetermined angles to form a plurality of the drills drilled vertically to the lower end of the pig iron mass in a series along the circular cut line.

[0012] Furthermore, in the pig iron drilling device of the present invention, it is preferable that a guide hole is formed at the outer protruding end of the upper rotating plate-shaped metal fitting through which the drilling machine of the drilling device is inserted.

[0013] Furthermore, it is preferable that the pig iron drilling device of the present invention comprises an inner annular rib and an outer annular rib that are provided protruding in an annular shape from the upper surface of the lower fixing plate-shaped metal fitting and extending concentrically at radial intervals, and a plurality of bearing materials that are housed in an annular groove formed between these paired inner annular ribs and outer annular ribs.

[0014] Furthermore, in the pig iron drilling device of the present invention, it is preferable that the central anchor member is driven vertically and fixed down to the lower end layer of the pig iron mass, which is solidified and deposited in multiple layers.

[0015] Furthermore, in the pig iron drilling device of the present invention, it is preferable that the lower fixing plate-shaped metal fitting is fixed to the inside of the circular cut line on the upper surface of the pig iron mass via a fixing anchor member, with a mortar layer laid between it and the upper surface of the pig iron mass.

[0016] Furthermore, it is preferable that the pig iron drilling device of the present invention be used when removing solidified pig iron deposits that have accumulated inside a pig iron mixing vehicle.

[0017] Furthermore, the present invention relates to a method for removing a solidified pile of pig iron using the pig iron drilling device described above, comprising the steps of: driving and fixing the central anchor member vertically from the upper surface of the pig iron mass to the center of a planned circular cut line; and fixing the lower fixing plate-shaped metal fitting to the upper surface of the pig iron mass via the fixed central anchor member, and attaching the upper swivel plate-shaped metal fitting rotatably on top of the lower fixing plate-shaped metal fitting via the swivel slide mechanism, and the drilling device comprising a drilling machine and a guide mast on the upper swivel plate-shaped metal fitting. The above objective is achieved by providing a method for removing a pig iron mass, comprising the steps of: installing a drilling device; using the installed drilling device, rotating the upper swivel plate-shaped metal fitting at predetermined angles, and forming multiple drilling holes in the vertical direction up to the lower end of the pig iron mass, in a continuous manner along the circular cut line; and thereafter, removing at least the drilling device from above the upper swivel plate-shaped metal fitting, and lifting and removing the pig iron mass in the inner region surrounded by the multiple drilling holes formed in a continuous manner along the circular cut line using a lifting device.

[0018] And, prior to the step of driving and fixing the central anchor member in the vertical direction, the present invention's method for removing pig iron lumps includes a step of performing core boring at the center of the circular cut line. In the step of fixing the central anchor member, it is preferable that the central anchor member is driven in the vertical direction through the boring hole formed in the step of performing core boring.

[0019] Also, in the step of driving and fixing the central anchor member in the vertical direction in the present invention's method for removing pig iron lumps, it is preferable that the central anchor member is driven in a length from the upper surface portion to the layer at the lower end portion of the pig iron lumps in a solidified state deposited in multiple layers.

[0020] Furthermore, in the step of lifting and removing the pig iron lumps in the inner region in the present invention's method for removing pig iron lumps, it is preferable that the lifting device lifts the pig iron lumps in the inner region through a lifting jig joined to the lower fixed plate-shaped metalware.

[0021] Moreover, in the present invention's method for removing pig iron lumps, it is preferable that the lower fixed plate-shaped metalware is fixed to the upper surface portion of the pig iron lumps through a fixed anchor member.

[0022] Also, in the present invention's method for removing pig iron lumps, it is preferable that it is used when removing pig iron lumps deposited in a solidified state inside a mixer car.

Advantages of the Invention

[0023] According to the present invention's pig iron perforating device or method for removing pig iron lumps, with a simple configuration, a plurality of perforations drilled in the vertical direction can be easily formed in a state where they are accurately continuously arranged along a circular cut line.

Brief Description of the Drawings

[0024] [Figure 1]The schematic cross-sectional view illustrates the state in which the pig iron drilling device according to a preferred embodiment of the present invention is used when removing the pig iron mass deposited inside the mixer car. [Figure 2] The cross-sectional view of the main part of the pig iron drilling device shows the main part of the pig iron drilling device omitting the drilling machine and the guide mast. [Figure 3] It is a plan view of the main part seen from above in FIG. 2. [Figure 4] (a) is a top view for explaining the lower fixed plate-shaped metalware and the rotary slide mechanism constituting the pig iron drilling device, and (b) is a cross-sectional view taken along line A-A of (a). [Figure 5] (a) is a top view for explaining the upper swing plate-shaped metalware constituting the pig iron drilling device, and (b) is a cross-sectional view taken along line B-B of (a). [Figure 6] The schematic cross-sectional view illustrates the process of lifting and removing the pig iron mass in the inner region surrounded by the continuously drilled holes along the circular cut line.

Mode for Carrying Out the Invention

[0025] The pig iron drilling device 10 according to a preferred embodiment of the present invention shown in FIG. 1 is preferably installed inside the mixer car 50 and is used as a transport vehicle for transporting hot metal melted with pig iron from, for example, a blast furnace plant to a steelmaking plant. When removing the pig iron mass 51 deposited in a solidified state inside the mixer car 50, a plurality of holes 52 are drilled from the upper surface to a predetermined depth of the pig iron mass 51 along the circular cut line 53 (see FIG. 3) set on the upper surface portion 51a of the pig iron mass 51. It is used as a device for accurately forming a plurality of holes 52 in a continuous state. The pig iron drilling device 10 of the present embodiment has a function of easily forming a plurality of vertically drilled holes 52 accurately along the circular cut line 53 in a simple configuration without requiring a large-scale temporary stage for installing a drilling crane.

[0026] Furthermore, the pig iron drilling device 10 of this embodiment is a drilling device installed on the upper surface 51a of a pig iron mass 51 when removing a pig iron mass 51 that has accumulated in a solidified state inside a mixing truck 50, for example, to form multiple vertically drilled holes 52 in a continuous manner along a planned circular cut line 53.As shown in Figures 2 and 3, the device comprises a lower fixed plate-shaped metal fitting 11 which is preferably fixed to the upper surface 51a of the pig iron mass 51 inside the circular cut line 53 via a central anchor member 20 and a fixed anchor member 21, an upper swivel plate-shaped metal fitting 15 which is rotatably superimposed on the lower fixed plate-shaped metal fitting 11 with a rotational slide mechanism 12 interposed between it and the lower fixed plate-shaped metal fitting 11, and a drilling device 18 (see Figure 1) which is installed on the upper swivel plate-shaped metal fitting 15 and includes a drilling machine 16 and a guide mast 17. The upper swivel plate-shaped metal fitting 15 is mounted so as to rotate around the central anchor member 20, with its rotation center side portion 15a rotatably locked to the central anchor member 20 fixed to the center of the circular cut line 53, and its outer protruding end 15b is positioned to extend to the outside of the circular cut line 53. The drilling device 18 is designed to allow the drilling machine 16 to slide up and down at the outer protruding end 15b, guided by the guide mast 17, and to form a series of holes 52 along the circular cut line 53, drilled vertically to the lower end of the pig iron mass 51, while rotating the upper swivel plate-shaped metal fitting 15 at predetermined angles.

[0027] Furthermore, as shown in Figures 4(a) and (b), the cast iron drilling device 10 of this embodiment consists of a rotating slide mechanism 12 which preferably protrudes in an annular shape from the upper surface of a lower fixing plate-shaped metal fitting 11 and extends concentrically at radial intervals, and a plurality of bearing materials 14 which are housed in an annular groove 13c formed between these paired inner annular ribs 13a and outer annular ribs 13b.

[0028] In this embodiment, the torpedo car 50 (see Figure 1), which has solidified pig iron ingots 51 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. Since it moves using rails, it is equipped with a bogie trolley (not shown) at the bottom. A furnace body 50a, which is a heat-resistant container shaped like a torpedo (cylindrical in the center and conical at both ends), is installed on top of the bogie trolley. The furnace body 50a is composed of an outer shell 50b made of steel plate, for example, and refractory bricks 50c lined inside the outer shell 50b. A circular tapping port 50d, for example with a diameter of about 1700 mm, is formed in the upper central part of the furnace body 50a. The molten iron received (tipped) from the tapping port 50d is transported to, for example, a converter plant, where the furnace body 50a is rotated so that the tapping port 50d faces downwards, allowing the molten iron to be discharged (tipped).

[0029] Furthermore, when molten iron is transported inside the mixing truck 50, some molten iron remains inside after tapping, and this remaining molten iron solidifies and accumulates as pig iron ingots (metal) 51. Even if the truck becomes unable to move or tap for any reason during transport, the molten iron inside will solidify and accumulate as pig iron ingots (metal) 51. The pig iron ingots 51 accumulated inside in this way reduce the capacity of the mixing truck 50 and therefore need to be dismantled and removed.

[0030] The pig iron drilling device 10 of this embodiment is used to efficiently dismantle and remove pig iron lumps 51 that have accumulated in a solidified state inside the pig iron mixing vehicle 50. It is preferably installed inside the pig iron mixing vehicle 50 and is used to accurately form multiple drilling holes 52 that are drilled from the top surface to the bottom of the pig iron lumps 51 to a predetermined depth, in a continuous manner along a circular cut line 53 (see Figure 3) set on the top surface 51a of the pig iron lumps 51.

[0031] In this embodiment, the lower fixing plate-shaped metal fitting 11 constituting the pig iron drilling device 10 is made of a steel plate member with a thickness of, for example, about 32 mm, as shown in Figures 3(a) and (b), and has a circular planar shape with a diameter of, for example, about 1200 mm. A central fastening hole 11a is formed in the central part of the lower fixing plate-shaped metal fitting 11 for fastening the upper end portion of the central anchor member 20, which will be described later. At a position approximately 400 mm radially away from the center of the central fastening hole 11a, fixing fastening holes 11b are formed at predetermined intervals in the circumferential direction, for example, eight locations, for fastening and fixing the upper end portion of the fixing anchor member 21, which will be described later.

[0032] Furthermore, on the upper surface of the lower fixing plate-shaped metal fitting 11, the inner annular rib 13a and the outer annular rib 13b, which constitute the rotational slide mechanism 12, are arranged concentrically and fixed in pairs by welding or the like. In this embodiment, the paired inner annular rib 13a and outer annular rib 13b are arranged concentrically and preferably in two pairs, one in the radially outer region and the other in the radially inner region.

[0033] Furthermore, in this embodiment, the guide rail fitting 22 is arranged concentrically with the inner annular rib 13a and the outer annular rib 13b along the peripheral edge of the upper surface of the lower fixing plate-shaped fitting 11, and is fixed and attached in a continuous annular shape by welding or the like. The guide locking fitting 23, which is attached to the lower surface of the upper swivel plate-shaped fitting 15 (described later), is slidably locked to the guide rail fitting 22 in the circumferential direction (see Figure 2), so that the rotation of the upper swivel plate-shaped fitting 15 around the central anchor member 20 is performed more stably and smoothly.

[0034] In this embodiment, the lower fixing plate-shaped metal fitting 11 is preferably fixed to the upper surface 51a of the pig iron mass 51 via a central anchor member 20 and a fixing anchor member 21, inside the circular cut line 53, with a mortar layer 24 laid between it and the upper surface 51a (see Figure 2). This makes it possible to fix the lower fixing plate-shaped metal fitting 11 to the upper surface 51a of the pig iron mass 51 in a more stable state, even if there are irregularities on the surface of the upper surface 51a of the accumulated pig iron mass 51, by absorbing such irregularities with the mortar layer 24.

[0035] In this embodiment, the rotating slide mechanism 12 constituting the pig iron drilling device 10 consists of an inner annular rib 13a and an outer annular rib 13b extending concentrically at a distance from each other in the radial direction, and a plurality of bearing materials 14 housed in an annular groove 13c formed between these paired inner annular ribs 13a and outer annular ribs 13b. The paired inner annular ribs 13a and outer annular ribs 13b are arranged concentrically and two pairs are provided in the radially inner and radially outer regions of the lower fixing plate-shaped metal fitting 11. Each of the inner annular rib 13a and outer annular rib 13b has a rectangular cross-sectional shape with a width of approximately 19 mm and a height of approximately 46 mm, and is erected from the lower fixing plate-shaped metal fitting 11 and fixed at a distance of approximately 56 mm in the radial direction. As described above, these paired inner annular ribs 13a and outer annular ribs 13b are arranged concentrically and provided in two pairs in the radially outer region and radially inner region. Two annular grooves 13c, each about 56 mm wide, are formed in the space between them and are positioned on the upper surface of the lower fixing plate-shaped metal fitting 11 such that the centerlines of these annular grooves trace, for example, a circle with a radius of 250 mm and a circle with a radius of 425 mm from the center of the lower fixing plate-shaped metal fitting 11.

[0036] Furthermore, in this embodiment, the multiple bearing materials 14 housed in the two annular grooves 13c are preferably spherical bearings with a diameter of about 50 mm, and are arranged tightly and rotatably in each annular groove 13c. The bearing materials 14 made of spherical bearings have a diameter of about 50 mm, so that their upper ends protrude slightly above the top surfaces of the inner annular ribs 13a and outer annular ribs 13b on both sides of the annular groove 13c. This ensures that the lower surface of the upper swivel plate-shaped metal fitting 15 is in firm contact with the bearing materials 14, allowing the upper swivel plate-shaped metal fitting 15 to rotate smoothly around the central anchor member 20 as the bearing materials 14 rotate.

[0037] In this embodiment, the upper swivel plate-shaped metal fitting 15 constituting the pig iron drilling device 10 is made of a steel plate member with a thickness of, for example, about 50 mm, and is formed to have a planar shape that is, for example, a semi-elliptical shape, as shown in Figures 5(a) and (b). The upper swivel plate-shaped metal fitting 15 has a planar shape that is a semi-elliptical shape with a semicircular side portion having a radius of about 400 mm in the longitudinal direction of the semi-elliptical shape as the rotation center side portion 15a, and an isosceles trapezoidal outer protruding end portion 15b is integrally extended on the opposite side. At the center position of the rotation center side portion 15a of the upper swivel plate-shaped metal fitting 15, a swivel fastening hole 15c is formed to fasten the upper end portion 20a of the central anchor member 20, corresponding to the position of the central fastening hole 11a of the central portion of the lower fixed plate-shaped metal fitting 11.

[0038] Furthermore, guide locking hardware 23 is attached to the upper swivel plate-shaped hardware 15, projecting downward from the bottom surface at a position approximately 600 mm away from the center of the swivel fastening hole 15c on the outer protruding end 15b side, corresponding to the radius of the lower fixed plate-shaped hardware 11. The guide locking hardware 23 is fixed to the bottom surface of the upper swivel plate-shaped hardware 15 by welding or the like at, for example, three locations spaced apart in the arc direction, corresponding to the position of the aforementioned guide rail hardware 22 which extends circumferentially along the peripheral edge of the circular lower fixed plate-shaped hardware 11. As described above, these guide locking hardware 23 are slidably locked to the guide rail hardware 22 of the lower fixed plate-shaped hardware 11, making it possible to rotate the upper swivel plate-shaped hardware 15 around the central anchor member 20 in a more stable and smooth manner.

[0039] Furthermore, in this embodiment, a guide hole 15d is formed in the region outside the position where the guide locking fitting 23 is attached to the isosceles trapezoidal outer protruding end 15b of the upper swivel plate-shaped fitting 15, for inserting the casing pipe 16b of the drilling device 18, which has a tip bit 16a attached to its lower end, to guide its vertical retraction. A known drilling device 18, which includes a drilling machine 16 and a guide mast 17, is installed integrally on the upper swivel plate-shaped fitting 15 (see Figure 1).

[0040] In this embodiment, the central anchor member 20, which is fixed to the center of the planned circular cut line 53, is made of an anchor bolt with an outer diameter of approximately 48 mm, as shown in Figures 1 and 2. Preferably, the central anchor member 20 is driven in and fixed in the vertical direction using a borehole 55 formed by core boring performed on the pig iron mass 51, which is deposited in a solidified state inside the pig iron mixing cart 50, in order to check in advance for the presence or absence of cracks in the pig iron mass 51 and to confirm the layer structure of the pig iron mass 51.

[0041] In other words, in this embodiment, core boring is preferably performed in the central part of the planned circular cut line 53 in the area directly below the tapping port 50d of the mixing wheel 50. The borehole 55 formed by core boring is used as a fixing hole to fix the central anchor member 20, and the central anchor member 20 is driven in to a predetermined depth. At the same time, the solidifying material 54 such as grout injected into the borehole 55 solidifies, making it possible to firmly fix the central anchor member 20 with, for example, the upper end portion 20a on which the male screw portion is formed protruding upward from the upper surface portion 51a of the pig iron mass 51 by a predetermined length.

[0042] Furthermore, the upper end portion 20a of the fixed central anchor member 20, which has a male threaded portion formed thereon and protrudes upward from the upper surface portion 51a of the pig iron mass 51, is inserted through the central fastening hole 11a of the lower fixing plate-shaped metal fitting 11, thereby penetrating the lower fixing plate-shaped metal fitting 11 which is installed on the upper surface portion 51a of the pig iron mass 51 with the mortar layer 24 in between. A ring-shaped distance piece 20b is attached to the upper end portion 20a of the central anchor member 20 that is inserted through the central fastening hole 11a of the lower fixing plate-shaped metal fitting 11. The upper end portion 20a of the central anchor member 20, to which the distance piece 20b is attached, is further inserted into the pivot fastening hole 15c of the pivot center side portion 15a of the upper pivot plate-shaped metal fitting 15, which is positioned on top of the lower fixing plate-shaped metal fitting 11 with the rotation slide mechanism 12 and the distance piece 20b interposed therebetween, and protrudes above the upper pivot plate-shaped metal fitting 15.

[0043] Then, a tightening nut 20d is screwed onto the upper end portion 20a of the central anchor member 20, which is inserted through the central tightening hole 11a of the lower fixing plate-shaped metal fitting 11, the distance piece 20b, and the swivel tightening hole 15c of the upper swivel plate-shaped metal fitting 15, with a spacer ring 20c interposed between them. As a result, the lower fixing plate-shaped metal fitting 11 is fastened and fixed to the upper surface portion 51a of the pig iron mass 51, and the upper swivel plate-shaped metal fitting 15 is fastened in a state where it can swivel and overlap the lower fixing plate-shaped metal fitting 11. The central anchor member 20 can also function as a fixing anchor member for fixing the lower fixing plate-shaped metal fitting 11 to the upper surface portion 51a of the pig iron mass 51.

[0044] If, for example, a crack 56 (see Figure 2) is found in the accumulated pig iron mass 51 through the core boring described above, it is preferable that the central anchor member 20 is driven in vertically and fixed down to the lower end layer 51b below the crack 56 in the pig iron mass 51. This makes it possible to lift and remove the inner region of the pig iron mass 51' (see Figure 6), which is surrounded by multiple drilling holes 52 formed in series along the circular cut line 53 as described later, using a lifting device 57, even if a crack 56 has occurred in the pig iron mass 51, by lifting the inner region of the pig iron mass 51' along its entire length in the vertical direction, from the top surface 51a to the bottom surface.

[0045] In this embodiment, as the fixing anchor member 21 for fixing the lower fixing plate-shaped metal fitting 11 to the upper surface 51a of the pig iron mass 51, a known resin anchor, preferably with an anchor bolt having an outer diameter of about 20 mm, can be used. The fixing anchor member 21 made of resin anchors is installed in the area inside the circular cut line 53, with anchor holes drilled at positions corresponding to the eight fixing fastening holes 11b of the lower fixing plate-shaped metal fitting 11 to be installed, to a depth of, for example, about 200 mm from the upper surface 51a of the pig iron mass 51, and the fixing fastening holes 11b are aligned with the drilled anchor holes. With the lower fixing plate-shaped metal fitting 11 positioned on the upper surface 51a of the pig iron mass 51, the fixing anchor member 21 is driven into each of the anchor holes, and the hardened resin firmly fixes it to the upper surface 51a of the pig iron mass 51.

[0046] Furthermore, a nut is fastened to the upper end portion 21a of the fixing anchor member 21, which is fixed to the upper surface portion 51a of the pig iron mass 51. This upper end portion 21a has a male threaded portion that protrudes upward from the lower fixing plate-shaped metal fitting 11. The lower fixing plate-shaped metal fitting 11 is then firmly fixed to the upper surface portion 51a of the pig iron mass 51 with the mortar layer 24 in between by the eight fastened nuts. The upper end portion 21a of the fixing anchor member 21 is provided to protrude upward from the lower fixing plate-shaped metal fitting 11 at a height that does not exceed the height of the inner annular rib 13a, the outer annular rib 13b, or the distance piece 20b.

[0047] The drilling device 18, which is installed on the upper swivel plate-shaped metal fitting 15, has a simpler configuration compared to general drilling heavy machinery, mainly consisting of a drilling machine 16 and a guide mast 17 (see Figure 1). The guide mast 17 is made of, for example, a known rectangular prism-shaped steel pipe member, and is firmly fixed on the upper swivel plate-shaped metal fitting 15 in a state where it stands vertically from the upper swivel plate-shaped metal fitting 15 by joining its lower end edge by welding or the like in the area between the swivel fastening hole 15c and the guide hole 15d on the upper surface of the upper swivel plate-shaped metal fitting 15. A slide guide portion 17a is integrally provided on the side of the guide mast 17 on the guide hole 15d side, extending vertically to guide the vertical movement of the attached drilling machine body 16c. A positioning guide portion 17b is attached to the lower end portion of the guide mast 17 so as to protrude toward the guide hole 15d side.

[0048] The drilling machine 16 of the drilling device 18 is composed of a drilling machine body 16c and a hollow rod-shaped casing pipe 16b that is gripped by the drilling machine body 16c and positioned to penetrate the drilling machine body 16c vertically. The rotational drive mechanism of the drilling machine body 16c is driven to rotate the gripped casing pipe 16b, while the drilling machine body 16c is moved up and down along the guide mast 17. This allows the lower end of the casing pipe 16b, to which the tip bit 16a is attached, to be pushed into the pig iron mass 51 from above while rotating, thereby drilling multiple holes 52 that are arranged in a series along the circular cut line 53. A supply hose 16d is connected to the upper end of the casing pipe 16b via a rotary joint 16e to supply spray water into the hollow interior of the casing pipe 16b to reduce friction when drilling the pig iron mass 51 with the tip bit 16a. Furthermore, it is desirable that the casing pipe 16b be positioned so as not to interfere with the opening edge of the tapping port 50d, and that the supply hose 16d be made of a flexible material.

[0049] For example, when dismantling and removing a solidified pig iron mass 51 accumulated inside a mixing truck 50, in order to form multiple vertically drilled holes 52 in a continuous manner along a planned circular cut line 53 using the pig iron drilling device 10 of this embodiment having the above configuration, a planned circular cut line 53 is set in the area directly below the tapping port 50d on the upper surface 51a of the pig iron mass 51 inside the mixing truck 50, and a central anchor member 20 is driven vertically from the upper surface 51a of the pig iron mass 51 and fixed to the center of the set circular cut line 53. Furthermore, the lower fixing plate-shaped metal fitting 11 is fixed to the upper surface 51a of the pig iron mass 51 by the fixing anchor member 21 via the fixed central anchor member 20, preferably with a mortar layer 24 interposed between them. The upper swivel plate-shaped metal fitting 15 is attached to the lower fixing plate-shaped metal fitting 11 in a rotatable manner by interposing a rotational slide mechanism 12, and the drilling device 18 is installed on top of the upper swivel plate-shaped metal fitting 15.

[0050] Then, a drilling device 18 installed on the upper swivel plate-shaped metal fitting 15 rotates the upper swivel plate-shaped metal fitting 15 at predetermined angles relative to the lower fixed plate-shaped metal fitting 11, forming multiple holes 52 that are drilled vertically to the lower end of the pig iron mass 51, in a continuous manner along the circular cut line 53. Here, the drilling device 18 on the upper swivel plate-shaped metal fitting 15 is positioned close to the upper surface 51a of the pig iron mass 51, and is installed in a manner that significantly reduces the stress path from the drilling device 18 to the upper surface 51a of the pig iron mass 51. This makes it possible to accurately position the tip bit 16a of a known, such as a drill-shaped solid bit or core cutter, at the lower end of the casing pipe 16b at a predetermined position along the circular cut line 53, and to obtain a stronger drilling reaction force. In particular, even when the drilling length of the holes 52 is long, it becomes possible to drill the holes 52 accurately in a stable vertical direction. Furthermore, this eliminates the need to make the overlapping portion of adjacent holes 52 along the circular cut line 53 larger to account for deviations during drilling, allowing it to be set smaller. This increases the effective length of the line cut and also makes it possible to obtain sufficient reaction force even when the drilling speed is high.

[0051] Furthermore, when the multiple perforations 52, which are arranged in a continuous manner along the circular cut line 53, penetrate the pig iron mass 51, the tip bit 16a at the lower end of the casing pipe 16b penetrates the pig iron mass 51 and reaches the refractory brick 50c at the bottom of the mixing cart 50. Since the refractory brick 50c has softer physical properties compared to the pig iron mass 51, the change in cutting resistance makes it easy to detect that the refractory brick 50c has been reached.

[0052] Once multiple holes 52 are formed vertically along the planned circular cut line 53, penetrating the pig iron mass 51 and arranged in a continuous ring shape, as shown in Figure 6, at least the drilling device 18 is removed from above the upper swivel plate-shaped metal fitting 15, preferably the upper swivel plate-shaped metal fitting 15 is also removed, and the pig iron mass 51' in the inner region surrounded by the multiple holes 52 formed in a continuous ring along the circular cut line 53 is lifted and removed using a lifting device 57, for example, a hook member suspended from the boom of a crane.

[0053] That is, for example, once multiple holes 52 are formed in a continuous line along a circular cut line 53, penetrating the pig iron mass 51, the drilling device 18 and the upper rotating plate-shaped metal fitting 15 are preferably 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. The lower end of a lifting wire 60 is connected to the joined lifting jig 58, and the upper end of the lifting wire 60 is locked to a lifting device 57, for example, a hook member, thereby making it possible to lift the pig iron mass 51' in the inner region via the lifting jig 58, for example, by a crane.

[0054] Therefore, the method for removing solidified pig iron masses using the pig iron drilling device 10 of this embodiment involves the steps of: driving a central anchor member 20 vertically into the center of a planned circular cut line 53 from the upper surface 51a of the pig iron mass 51 and fixing it in place; fixing a lower fixing plate-shaped metal fitting 11 to the upper surface 51a of the pig iron mass 51 via the fixed central anchor member 20, and attaching an upper swivel plate-shaped metal fitting 15 to the lower fixing plate-shaped metal fitting 11 in a rotatable overlapping state with the upper swivel plate-shaped metal fitting 11 via a rotating slide mechanism 12; and placing a drilling machine 16 and The process includes the steps of: installing a drilling device 18 equipped with a guide mast 17; using the installed drilling device 18 to rotate the upper swivel plate-shaped metal fitting 15 at predetermined angles while forming multiple vertical holes 52 along a circular cut line 53, extending down to the lower end of the pig iron mass 51; and subsequently removing at least the drilling device 18 from above the upper swivel plate-shaped metal fitting 15, and then lifting and removing the pig iron mass 51' in the inner region surrounded by the multiple holes 52 formed along the circular cut line 53 using a lifting device 58.

[0055] Furthermore, in the method for removing the pig iron mass of this embodiment, it is preferable that the process includes a step of performing core boring at the center of the circular cut line 53 prior to the step of driving and fixing the central anchor member 20 in the vertical direction, and in the step of fixing the central anchor member 20, it is preferable that the central anchor member 20 is driven in vertically through the borehole 55 formed in the core boring step.

[0056] Furthermore, in the method for removing the pig iron mass of this embodiment, in the step of driving and fixing the central anchor member 20 in the vertical direction, it is preferable that the central anchor member 20 is driven in to a length from the upper surface 51a to the lower end layer 51b of the solidified pig iron mass 51 which is piled up in multiple layers.

[0057] As a result, according to the pig iron drilling device 10 of this embodiment and the pig iron mass removal method using the pig iron drilling device 10, it is possible to easily form a plurality of vertically drilled holes 52 precisely connected along a circular cut line 53 in a pig iron mass 51 that is solidified and accumulated inside a mixing truck 50, for example, with a simple configuration.

[0058] It should be noted that the present invention is not limited to the embodiments described above and can be modified in various ways. For example, the pig iron drilling device of the present invention is not limited to pig iron lumps accumulated in a molten iron cart, but can also be used in the same way when dismantling and removing pig iron lumps that have been accumulated in a solidified state in a molten iron ladle or blast furnace, or other various solidified pig iron lumps, by installing it on the upper surface of these lumps. The rotational slide mechanism interposed between the lower fixed plate-shaped metal fitting and the upper rotating plate-shaped metal fitting does not necessarily have to consist of an inner annular rib and an outer annular rib that protrude in an annular shape from the upper surface of the lower fixed plate-shaped metal fitting and extend concentrically at radial intervals, and a plurality of bearing materials housed in an annular groove formed between these paired inner annular ribs and outer annular ribs. Various other rotational slide mechanisms can also be used. [Explanation of Symbols]

[0059] 10 Pig iron drilling equipment 11 Lower fixing plate-shaped metal fittings 11a Central fastening hole 11b Fixing fastening hole 1956 12 Rotation slide mechanism 13a Inner annular rib 13b Outer annular rib 13c Annular groove 14 Bearing material 15 Upper swivel plate-shaped metal fitting 15a Rotation center side portion 15b Outer protruding end 15c Swivel fastening hole 15d guide hole 16 Drilling machine 16a tip bit 16b Casing pipe 16c drilling machine body 16d Supply hose 17 Guide mast 17a Slide guide section 17b Positioning guide section 18 Drilling device 19a Pinion member 20 Central anchor member 20a Upper end part 20b Distance Piece 20c Spacer Ring 20d fastening nut 21 Fixed anchor member 21a Upper end part 22 Guide rail hardware 23 Guide locking hardware 24 Mortar layer 50. Torpedo Car 50a furnace body 50b Outer shell 50c firebrick 50d taphole 51 Pig iron ingots 51' Inner region of pig iron mass 51a Top part 51b Layer at the lower end of the pig iron ingot 51 52 perforation 53 Circular cut lines 54 Solidifying agent 55 boreholes 56 Crack 57 Lifting equipment 58 Lifting jig 60 Suspension wires

Claims

1. A pig iron drilling device for removing a solidified pig iron mass, which is installed on the upper surface of the pig iron mass and drills vertically, forming multiple holes in a continuous manner along a planned circular cut line, The upper surface of the pig iron mass includes, inside the circular cut line, a lower fixing plate-shaped fitting fixed via a fixing anchor member, an upper swivel plate-shaped fitting rotatably superimposed on the lower fixing plate-shaped fitting with a rotational sliding mechanism interposed between them, and a drilling device equipped with a drilling machine and a guide mast, which is installed on the upper swivel plate-shaped fitting. The upper swivel plate-shaped metal fitting is mounted so as to rotate around the central anchor member, with its rotation center side portion rotatably locked to the central anchor member fixed to the center of the circular cut line, and its outer protruding end extends to the outside of the circular cut line. The drilling device is configured such that the drilling machine is guided by the guide mast and slides up and down at the outer protruding end, and while rotating the upper swivel plate-shaped metal fitting at predetermined angles, a plurality of the drilling holes drilled vertically up to the lower end of the pig iron mass are formed in a series along the circular cut line.

2. The pig iron drilling device according to claim 1, wherein a guide hole for inserting the drilling machine of the drilling device is formed at the outer protruding end of the upper rotating plate-shaped metal fitting.

3. The cast iron drilling device according to claim 1 or 2, wherein the rotating slide mechanism comprises an inner annular rib and an outer annular rib that protrude in an annular shape from the upper surface of the lower fixing plate-shaped metal fitting and extend concentrically at radial intervals, and a plurality of bearing materials that are housed in an annular groove formed between these paired inner annular ribs and outer annular ribs.

4. The pig iron drilling device according to claim 1 or 2, wherein the central anchor member is driven vertically and fixed down to the lower end layer of the pig iron mass, which is deposited in multiple layers in a solidified state.

5. The pig iron drilling device according to claim 1 or 2, wherein the lower fixing plate-shaped metal fitting is fixed to the inside of the circular cut line via a fixing anchor member, with a mortar layer laid between it and the upper surface of the pig iron mass.

6. A pig iron drilling device according to claim 1 or 2, used for removing pig iron lumps that have solidified and accumulated inside a pig iron mixing vehicle.

7. A method for removing solidified pig iron deposits using the pig iron drilling device described in claim 1 or 2, The process involves driving the central anchor member into the center of the planned circular cut line, vertically from the upper surface of the pig iron mass, and fixing it in place. The process involves fixing the lower fixing plate-shaped metal fitting to the upper surface of the pig iron mass via the fixed central anchor member, attaching the upper swivel plate-shaped metal fitting to the lower fixing plate-shaped metal fitting in a rotatable manner by interposing the rotational slide mechanism, and installing the drilling device, which includes a drilling machine and a guide mast, on the upper swivel plate-shaped metal fitting. The process involves using the installed drilling device to rotate the upper rotating plate-shaped metal fitting at predetermined angles, thereby forming multiple holes in a continuous manner along the circular cut line, extending vertically down to the lower end of the pig iron mass. A method for removing a pig iron mass, comprising the steps of: removing at least the drilling device from above the upper rotating plate-shaped metal fitting; and then lifting and removing the pig iron mass in the inner region surrounded by the multiple drillings formed in series along the circular cut line using a lifting device.

8. A method for removing a pig iron mass according to claim 7, wherein, prior to the step of driving and fixing the central anchor member in the vertical direction, a step of performing core boring at the center of the circular cut line is included, and in the step of fixing the central anchor member, the central anchor member is driven in the vertical direction through the borehole formed in the step of performing core boring.

9. The method for removing a pig iron mass according to claim 8, wherein in the step of driving and fixing the central anchor member in the vertical direction, the central anchor member is driven in to a length from the upper surface to the lower end layer of the solidified pig iron mass which is piled up in multiple layers.

10. The method for removing a pig iron mass according to claim 7, wherein, in the step of lifting and removing the pig iron mass in the inner region, the lifting equipment lifts the pig iron mass in the inner region via a lifting jig joined to the lower fixing plate-shaped metal fitting.

11. The method for removing a pig iron mass according to claim 10, wherein the lower fixing plate-shaped metal fitting is fixed to the upper surface of the pig iron mass via a fixing anchor member.

12. A method for removing pig iron lumps according to claim 7, used when removing pig iron lumps that have accumulated in a solidified state inside a pig iron mixing truck.

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