Hearth brick laying work platform

Abstract

To provide a work rack for laying furnace bottom bricks, which can suppress collapse of furnace bottom bricks from pallets installed at the bottom of a converter furnace and requires less labor for laying furnace bottom bricks.SOLUTION: A work rack 20 for laying furnace bottom bricks has: a rotary table 21 installed in the furnace bottom of a converter 1; a pallet mounting part 31 mounted on the rotary table 21; a pallet 23 mounted on the pallet mounting part 31, on the pallet 23 the furnace bottom surrounding wear bricks 5b installed in the furnace bottom are mounted; a pair of vertical walls 32A and 32B arranged so as to sandwich the pallet 23 and rise from the pallet mounting part 31; and a pair of brick take-out frontage 35 and 36 formed by a pair of vertical walls 32A and 32B and opened in two opposite directions (longitudinal A1) among the horizontal directions to send out the furnace bottom surrounding wear bricks 5b on the pallet 23 from between the pair of vertical walls 32A and 32B.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a work platform for laying hearth bricks. [Background technology]

[0002] A steelmaking converter usually has a two-layer brick refractory structure in which permanent bricks are attached to the inside surface of the steel shell, and wear bricks are installed inside the permanent bricks. The wear bricks are directly exposed to molten iron. For this reason, the wear bricks are prone to deterioration over time and are replaced at predetermined intervals. A brick installation device used for replacing bricks inside a converter is known (see, for example, Patent Documents 1 and 2). When replacing wear bricks, the old bricks are removed from the converter, and new bricks are then laid in place. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-249498 A [Patent Document 2] Japanese Patent Application Publication No. 1-152213 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, the hearth of a converter is roughly classified into two types, a replaceable hearth and a non-replaceable hearth, and the brick laying method is different for each type.

[0005] Converters with replaceable hearths are divided into two types: replaceable hearths and fixed hearths, and even among replaceable hearths, there are two main methods for laying bricks. The first method is to connect the replacement hearth, which has bricks already loaded on it, to the converter body outside the steel shell, and then load bricks for the fixed hearth from the side of the replacement hearth. In this method, bricks for the fixed hearth are generally loaded using an electric chain block (hoist). The second method is to use a furnace tower to load all the upper bricks from the fixed hearth, and then connect the replacement hearth to the converter body.

[0006] In converters with a non-returnable hearth, it is common to use an electric chain block to lay the bricks for the hearth, and then use a furnace tower to lay the bricks above the hearth.

[0007] Among the above-mentioned hearth brick stacking methods, in particular, in the stacking of hearth bricks using an electric chain block in a replaceable hearth, first, a minimum number of hearth bricks are stacked on the hearth. Then, a pallet on which a number of hearth bricks are placed is placed on the stacked hearth bricks. Then, after the hearth bricks on the pallet are lifted by the electric chain block, the hearth bricks are stacked on the hearth. In this stacking work, if the hearth bricks fall off the pallet and the load collapses, it is necessary to place the collapsed hearth bricks back on the pallet, which is time-consuming. For this reason, it is possible to prevent the load collapse of the hearth bricks by providing vertical walls around the pallet. However, the hearth bricks are assembled in large numbers along the circumferential direction of the hearth when viewed from above, centered on the pallet. For this reason, if there is a vertical wall for preventing the load collapse, the hearth bricks cannot be removed in the direction in which the vertical wall exists, and the work of stacking the hearth bricks is time-consuming.

[0008] The present invention has been made to solve such problems, and has an object to provide a work platform for stacking hearth bricks, which can prevent the hearth bricks from collapsing from the pallet installed at the bottom of the converter furnace and reduces the labor required for stacking the hearth bricks. [Means for solving the problem]

[0009] The present invention relates to the following hearth brick laying work platform.

[0010] (1) A rotating table installed at the bottom of the converter; A pallet placement unit that is placed on the rotating table and can be rotated about a vertical axis by the rotating table; A pallet is placed on the pallet placement section, and a pallet on which hearth bricks to be installed in the hearth are placed; A pair of vertical walls arranged to sandwich the pallet and rising from the pallet placement portion; A pair of brick removal openings formed by the pair of vertical walls and opened in two opposite directions in a horizontal direction for sending out the hearth bricks on the pallet from between the pair of vertical walls; A work platform for laying hearth bricks, comprising:

[0011] (2) The hearth brick stacking work platform described in (1) above, further comprising an anti-sway mechanism for suppressing the swaying motion of the hearth brick being lifted and sent out from the brick removal opening.

[0012] (3) The anti-sway mechanism includes: A pad on which the hearth bricks delivered from the brick removal opening are placed; A damping part connected to the pad and damping an impact applied to the pad; The hearth brick laying work platform according to (2) above,

[0013] (4) The work platform for laying hearth bricks described in (3) above, wherein the pad includes a chain chain formed by combining a plurality of chain elements.

[0014] (5) The attenuation portion is A fixing portion fixed to the vertical wall; a movable part supported by the fixed part and movable in conjunction with the pad; The hearth brick laying work platform according to (3) or (4), comprising:

[0015] (6) The fixing portion includes a tube, The hearth brick laying work platform according to (5) above, wherein the movable part includes a rod that is inserted into the cylinder so as to be capable of frictionally sliding.

[0016] (7) A work platform for laying hearth bricks as described in (5) or (6) above, wherein the movable part is arranged diagonally upward, inclining upward as it moves from the fixed part side to the pad side.

[0017] (8) A taper guide is provided at the upper end of the vertical wall, The hearth brick laying work platform according to any one of (1) to (7), wherein the taper guide is inclined so as to move away from the pallet as it advances to the upper side.

[0018] (9) The hearth brick-laying work platform according to any one of (1) to (8), further comprising a rib for preventing the vertical wall from tilting.

[0019] (10) A work platform for stacking hearth bricks as described in any one of (1) to (9), wherein a gap width, which is a value obtained by subtracting the width of the pallet from the distance between a pair of the vertical walls, is set to be less than the width of the hearth brick having the smallest width among the plurality of hearth bricks placed on the pallet. Effect of the Invention

[0020] According to the present invention, it is possible to prevent the collapse of hearth bricks from the pallet installed at the bottom of the converter, and the labor required for stacking the hearth bricks is reduced. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic cross-sectional view of a converter on which bricks have been laid using a hearth brick-laying work platform according to one embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of the periphery of the furnace bottom shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view for explaining the renewal work of wear bricks of the hearth brick portion. [Figure 4] FIG. 4 is a front view showing a state in which a hearth brick laying work platform is installed on the hearth center wear brick, and is partially shown in cross section. [Diagram 5] FIG. 5 is a side view of the work platform. [Figure 6] FIG. 6 is a plan view of the work platform. [Figure 7] FIG. 7 is a diagram showing an example of the pad, and only a part of the pad is shown. [Figure 8] FIG. 8 is a diagram for explaining the work of stacking hearth-bottom surrounding wear bricks. [Figure 9] FIG. 9 is a diagram for explaining the work of stacking hearth-bottom surrounding wear bricks. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0023] Fig. 1 is a schematic cross-sectional view of a converter 1 on which bricks have been loaded using a hearth brick loading work platform according to one embodiment of the present invention. Fig. 2 is an enlarged view of the periphery of the hearth 6 in Fig. 1. Note that in each drawing, the boundary lines between bricks and the like are partially omitted in the portion behind the cross section.

[0024] 1 and 2, the converter 1 is used, for example, to refine (e.g., decarburize) molten iron taken out from a blast furnace. The converter 1 may be used as an electric furnace that melts iron scrap by electric energy. In this embodiment, unless otherwise specified, the converter 1 is described based on the state where it is in an upright position (position during refining).

[0025] The converter 1 has a shell 2 and a refractory structure 3 installed on the shell 2.

[0026] The shell 2 is a metal member formed into a hollow container shape. The upper end of the shell 2 is open. The shell 2 has a tapered portion whose diameter increases downward, and a substantially cylindrical portion. The lower end of the shell 2 extends so as to close the hollow portion. A fireproof structure 3 is provided on substantially the entire inner surface of the shell 2.

[0027] The refractory structure 3 is provided for receiving molten iron and includes a number of permanent bricks 4 arranged adjacent to the shell 2 and a number of wear bricks 5 arranged inside the converter 1 relative to the permanent bricks 4.

[0028] The permanent bricks 4 are, for example, MgO bricks, and are formed in a block shape. A large number of the permanent bricks 4 are arranged on the inner surface of the steel shell 2 along the circumferential direction C1 and the vertical direction of the converter 1.

[0029] The wear bricks 5 are bricks that are directly exposed to the molten iron, for example, MgO-C bricks, and are formed in a block shape. A large number of wear bricks 5 are arranged on the inner surface of the permanent bricks 4. The wear bricks 5 are arranged along the circumferential direction C1 and the vertical direction, similar to the permanent bricks 4.

[0030] The converter 1 having the above-mentioned configuration includes a furnace bottom 6, a straight body section 7 arranged above the furnace bottom 6, and a tapered inclined section 8 extending from the straight body section 7 upwardly of the straight body section 7 and having a diameter that decreases with increasing distance from the straight body section 7.

[0031] The furnace bottom 6 has a hearth shell 2 a and a hearth brick section 10 which is a part of the refractory structure 3 that is installed in the furnace bottom 6 .

[0032] The hearth shell 2a is a part of the shell 2, and is disposed so as to close the bottom of the molten iron storage space 14. A hearth brick section 10 is disposed on the hearth shell 2a.

[0033] The hearth brick section 10 has a two-layer brick structure constituted by perm bricks 4 and wear bricks 5 arranged in the hearth bottom section 6 .

[0034] The hearth 6 has a hearth center 11 and a hearth peripheral portion 12 formed around the hearth center 11 .

[0035] The hearth center 11 is a portion provided at the center of the hearth 6, and has a diameter of, for example, about 1 m to several meters. The hearth center shell 2b as the hearth shell 2a in the hearth center 11 is formed of a separate member from the hearth peripheral shell 2c as the hearth shell 2a in the hearth peripheral portion 12, and can be separated from the hearth peripheral shell 2c.

[0036] The hearth center 11 has a hearth center iron shell 2b, a hearth center permanent brick 4a as a permanent brick 4 installed on the hearth center iron shell 2b, and a hearth center wear brick 5a as a wear brick 5 installed on the hearth center permanent brick 4a.

[0037] The hearth peripheral portion 12 is a portion of the hearth 6 other than the hearth central portion 11. A hearth peripheral shell 2c as the hearth shell 2a in the hearth peripheral portion 12 is integrally formed with the shell 2 in the straight body portion .

[0038] The hearth peripheral portion 12 has a hearth peripheral iron shell 2c, a hearth peripheral permanent brick 4b as the permanent brick 4 installed on the hearth peripheral iron shell 2c, and a hearth peripheral wear brick 5b as the wear brick 5 installed on the hearth peripheral permanent brick 4b. A cylindrical straight body portion 7 extending vertically is disposed above the hearth bottom portion 6 having the above-mentioned configuration.

[0039] The straight body portion 7 has an iron shell 2 in the straight body portion 7 and a straight body brick portion 15 as a portion of the fireproof structure 3 arranged in the straight body portion 7.

[0040] The straight body brick section 15 is composed of permanent bricks 4 arranged in the straight body section 7 and wear bricks 5 arranged on the inner surface side of the permanent bricks 4. A tapered inclined section 8 is arranged above the straight body section 7 having the above-mentioned configuration.

[0041] The inclined portion 8 has an inclined shell 2 and an inclined brick portion 20 as a portion of the fireproof structure 3 arranged in the inclined portion 8. An opening 1a of the converter 1 is formed in the inclined portion 8.

[0042] The wear bricks 5 (hearth-bottom peripheral wear bricks 5b) of the hearth brick section 10 in the hearth 6 of the converter 1 having the above-mentioned configuration are renewed by the method described below.

[0043] 3 is a cross-sectional view for explaining the renewal work of the wear bricks 5 of the hearth brick section 10. With reference to FIG. 3, when the wear bricks 5 in the converter 1 are renewed, the wear bricks 5 in the converter 1 are first removed. Then, new wear bricks 5 are loaded in the shell 2.

[0044] When the wear bricks 5 of the hearth brick section 10 are renewed, first, the hearth center shell 2b is separated from the hearth peripheral shell 2c and removed from the converter 1 (the hearth peripheral shell 2c). Then, outside the converter 1, the hearth center wear bricks 5a are stacked manually on the hearth center permanent brick 4a using an electric chain block or the like. This completes the hearth center 11. The hearth center 11 is inserted into the converter 1 through the through hole 2d formed in the hearth peripheral shell 2c. Then, with the hearth center shell 2b fitted into the through hole 2d, the hearth center shell 2b is joined to the hearth peripheral shell 2c. After that, the hearth peripheral wear bricks 5b are stacked on the hearth peripheral permanent brick 4b.

[0045] Fig. 4 is a front view showing a state where the hearth brick laying work platform 20 is installed on the hearth center wear brick 5a, and a part of the work platform is shown in cross section. In the following, the hearth brick laying work platform 20 is also simply called the work platform 20. Fig. 5 is a side view of the work platform 20. Fig. 6 is a plan view of the work platform 20.

[0046] 3 to 6, the work platform 20 is temporarily installed on the hearth center wear brick 5a. The work platform 20 is used to install the hearth peripheral wear brick 5b on the hearth peripheral permanent brick 4b. An operator uses the work platform 20 and a lifting device such as an electric chain block 16 installed above the work platform 20 to install the hearth peripheral wear brick 5b on the hearth peripheral permanent brick 4b.

[0047] The electric chain block 16 is attached to a crane or the like (not shown) installed on the converter 1. The electric chain block 16 has a main body 16a including an electric motor, and uses the output of the electric motor to move a hook 16c attached to a flexible rope 16b up and down. When the converter 1 is viewed from above, the rope 16b (electric chain block 16) is installed, for example, at a 90° pitch in the circumferential direction C1 of the converter 1 with the hearth center 11 as the center. With this configuration, the electric chain block 16 to be used can be changed depending on the position where the hearth peripheral wear bricks 5b are stacked. In this embodiment, the hearth peripheral wear bricks 5b can be stacked by simultaneously using a pair of electric chain blocks 16, 16 facing each other at 180° in the circumferential direction C1.

[0048] In addition, as described later, the work platform 20 has a portion that can rotate along the circumferential direction C1 of the converter 1. With these configurations, the work of stacking the hearth peripheral wear bricks 5b at any position in the circumferential direction C1 can be efficiently performed.

[0049] In this embodiment, the hearth surrounding wear bricks 5b are placed on the pallet 23 in a stacked state from the opening 1a of the converter 1 onto the pallet placement portion 31 of the work platform 20.

[0050] The hearth peripheral wear brick 5b is formed in a long and narrow block shape. In this embodiment, the hearth peripheral wear brick 5b has a rectangular cross section perpendicular to the longitudinal direction at any point in the longitudinal direction of the hearth peripheral wear brick 5b. In addition, the cross-sectional area of ​​the cross section is continuously reduced from one end of the hearth peripheral wear brick 5b to the other end. In this embodiment, the cross-sectional shape of the hearth peripheral wear brick 5b may be square or rectangular. A hoisting tool 5c that is hung on the hook 16c of the electric chain block 16 is fixed to the other end of the hearth peripheral wear brick 5b. The hoisting tool 5c is, for example, an eye bolt. The hearth peripheral wear brick 5b is lifted up while the hoisting tool 5c is hung by the hook 16c, and is taken out of the pallet 23.

[0051] A scaffold 18 is installed on the hearth center wear brick 5a, and a work platform 20 is installed on the scaffold 18. The scaffold 18 has a plurality of block-shaped legs and a deck placed horizontally on the legs. The deck is a flat member, and the work platform 20 is placed on the deck in a horizontal position.

[0052] The work platform 20 has a rotating table 21 installed on scaffolding 18 at the bottom of the converter 1, a platform main body 22 placed on the rotating table 21, a pallet 23 placed on the platform main body 22, and anti-sway mechanisms 25, 26 installed on the platform main body 22.

[0053] The rotating table 21 is, for example, a thrust bearing. The lower race of the rotating table 21 is placed on the scaffolding 18, and the upper race of the rotating table 21 can rotate around an axis perpendicular to the lower race of the rotating table 21. By providing the rotating table 21, the rack body 22 and the hearth peripheral wear bricks 5b can be rotated by light manual force.

[0054] The frame body 22 is formed in a U-shape when viewed from the front, and is formed so as to cover the hearth peripheral wear bricks 5b when viewed from the front. The frame body 22 can be rotated around a vertical axis by a rotating table 21.

[0055] The stand main body 22 has a pallet mounting portion 31 as the bottom of the stand main body 22, a pair of vertical walls 32A, 32B arranged to sandwich the pallet 23 and rising from the pallet mounting portion 31, taper guides 33A, 33B provided at the upper ends of the pair of vertical walls 32A, 32B, and a rib 34 for preventing the pair of vertical walls 32A, 32B from tilting.

[0056] In this embodiment, the direction in which the pair of vertical walls 32A, 32B extend parallel to each other in a plan view is defined as a vertical direction A1, and the direction perpendicular to the vertical direction A1 in a plan view is defined as a horizontal direction B1.

[0057] The pallet mounting portion 31 is placed on the upper part of the rotating table 21, and the pallet mounting portion 31 of the frame body 22 is the portion that comes into contact with the upper raceway of the rotating table 21. The pallet mounting portion 31 is formed in a size that allows the pallet 23 to be placed thereon, and in this embodiment, is formed in a rectangular flat plate shape.

[0058] In this embodiment, the pallet 23 is formed in a flat block shape of a rectangular parallelepiped. The pallet 23 is placed on the pallet placement portion 31 so as not to protrude from the pallet placement portion 31 in a plan view. A plurality of hearth peripheral wear bricks 5b are placed on the pallet 23 in a horizontal position. The hearth peripheral wear bricks 5b are stacked in multiple stages (four stages in this embodiment). In each stage, the hearth peripheral wear bricks 5b are stacked in multiple rows (five rows in this embodiment) so that the positions of one end of each are aligned in the horizontal direction B1. In addition, the hearth peripheral wear bricks 5b in each stage are arranged such that the positions of one end and the other end are opposite to those of the hearth peripheral wear bricks 5b in the stage adjacent to the upper or lower side. That is, on the pallet 23, the other end of another hearth peripheral wear brick 5b is placed on one end of the hearth peripheral wear brick 5b, and such an arrangement is repeated.

[0059] The pallet 23 and the multiple hearth surrounding wear bricks 5b placed on the pallet 23 are lowered through the opening 1a of the converter 1 using a conveying device not shown, with the frame body 22 and the anti-vibration mechanisms 25, 26 installed at the hearth, and placed on the pallet placement section 31.

[0060] A pair of vertical walls 32A, 32B are installed so as to sandwich the pallet 23 therebetween.

[0061] The vertical walls 32A and 32B are provided as protective walls in the event that the hearth surrounding wear bricks 5b on the pallet 23 collapse. The vertical walls 32A and 32B are also provided as support parts for supporting the anti-vibration mechanisms 25 and 26. The vertical walls 32A and 32B are provided on two parallel sides of the four sides of the pallet placement part 31, and in this embodiment, they are provided over the entire area of ​​these two sides. The vertical walls 32A and 32B are arranged in a vertical position and are fixed to the pallet placement part 31 in a state parallel to each other along the vertical direction A1. The vertical walls 32A and 32B are each formed in a rectangular flat plate shape, and cover the pallet 23 and each hearth surrounding wear brick 5b on the pallet 23 in a side view.

[0062] The pallet 23 is disposed between the vertical walls 32A and 32B. A gap of length L1 is formed between one vertical wall 32A and the pallet 23, and a gap of length L2 is formed between the other vertical wall 32B and the pallet 23. The pallet 23 may be disposed in contact with either one of the vertical walls 32A and 32B to form a gap of length L1+L2 between the other vertical wall. This length L1+L2 is the gap width obtained by subtracting the width of the pallet 23 from the interval between the pair of vertical walls 32A and 32B. On the other hand, there is a hearth peripheral wear brick 5b having the smallest horizontal width L3 (length L3 in the horizontal direction B1) among the multiple hearth peripheral wear bricks 5b placed on the pallet 23. In this embodiment, the horizontal widths of all the hearth peripheral wear bricks 5b are uniform, but they may be different.

[0063] Moreover, it is preferable that the gap width L1 + L2 is set to be less than the smallest lateral width L3 (L1 + L2 < L3). When such dimensional relationship is established, even if the furnace bottom peripheral wear bricks 5b on the pallet 23 collapse accidentally, the furnace bottom peripheral wear bricks 5b will not get into the space between the pallet 23 and the vertical walls 32A and 32B. Thereby, it is possible to suppress the occurrence of a large collapse.

[0064] At both ends of the pair of vertical walls 32A and 32B in the vertical direction A1, there are brick removal openings 35 and 36. The brick removal openings 35 and 36 are formed by the pair of vertical walls 32A and 32B, and are openings that are opened in two opposite horizontal directions (vertical direction A1) for sending out the furnace bottom peripheral wear bricks 5b on the pallet 23 from between the pair of vertical walls 32A and 32B. In the present embodiment, the brick removal openings 35 and 36 are formed by the pallet placement portion 31 in addition to the pair of vertical walls 32A and 32B, and form a U-shaped opening that is open upward in the front view shown in FIG. 4.

[0065] The tapered guides 33A and 33B are guides for arranging the pallet 23 and the furnace bottom peripheral wear bricks 5b that descend from above the gantry body 22 toward the gantry body 22 between the pair of vertical walls 32A and 32B. In the present embodiment, the tapered guides 33A and 33B are formed using flat plate members. The tapered guides 33A and 33B are provided at the upper ends of the vertical walls 32A and 32B as described above, and are inclined so as to move away from the pallet 23 (pallet placement portion 31) as they go upward. That is, the tapered guides 33A and 33B are inclined so that the distance between them increases as they go upward from the lower ends fixed to the vertical walls 32A and 32B. In the present embodiment, the tapered guides 33A and 33B are formed over the entire area of the vertical walls 32A and 32B in the vertical direction A1, but they may be formed only in a partial area. The height of the tapered guides 33A and 33B above the vertical walls 32A and 32B is set as appropriate. Note that only one of the tapered guides 33A and 33B may be provided.

[0066] By providing such inclined taper guides 33A, 33B, the pallet 23 and hearth surrounding wear bricks 5b descending from above the stand body 22 toward the stand body 22 can be smoothly inserted between the pair of vertical walls 32A, 32B.

[0067] A rib 34 is provided on the outer side in the lateral direction B1 of the vertical walls 32A, 32B and the taper guides 33A, 33B.

[0068] In this embodiment, the rib 34 is formed using a steel material such as an H-shaped steel. In this embodiment, the rib 34 has a lower beam rib 41, a column rib 42 connected to the lower beam rib 41, an upper beam rib 43 connected to the column rib 42, and a guide rib 44 connected to the upper beam rib 43 and supporting the taper guides 33A and 33B.

[0069] The lower beam rib 41 is provided as a base for the rib 34 and is provided to reinforce the lower ends of the vertical walls 32A and 32B. The lower beam rib 41 is a beam with the longitudinal direction being the vertical direction A1, and is fixed to the pallet placement portion 31 and the vertical walls 32A and 32B. The column rib 42 is a column that is erected vertically from the lower end to the upper end of the vertical walls 32A and 32B. In this embodiment, three column ribs 42 are arranged at equal intervals in the vertical direction A1 on one vertical wall 32A side, and three column ribs 42 are arranged at equal intervals in the vertical direction A1 on the other vertical wall 32B side. The column rib 42 is fixed to the lower beam rib 41 and the vertical walls 32A and 32B. The upper beam rib 43 is provided to reinforce the upper ends of the vertical walls 32A and 32B. The upper beam rib 43 is a beam whose longitudinal direction is the vertical direction A1, and is fixed to the vertical walls 32A, 32B and the taper guides 33A, 33B.

[0070] In this way, by providing the ribs 34, the vertical walls 32A, 32B can be prevented from tilting due to the load from the anti-sway mechanisms 25, 26. In addition, the ribs 34 can prevent the vertical walls 32A, 32B from tilting when the pallet 23 comes into contact with the vertical walls 32A, 32B during the time when the pallet 23 and the hearth surrounding wear bricks 5b descend from above the rack body 22 and are placed on the pallet placement section 31.

[0071] Next, the anti-vibration mechanisms 25 and 26 will be described.

[0072] The anti-sway mechanisms 25, 26 are provided to suppress the vibration of the hearth surrounding wear bricks 5b that are lifted and sent out from the brick removal openings 35, 36. The anti-sway mechanism 25 suppresses the vibration of the hearth surrounding wear bricks 5b sent out from the brick removal opening 35, and the anti-sway mechanism 26 suppresses the vibration of the hearth surrounding wear bricks 5b sent out from the brick removal opening 36.

[0073] The anti-vibration mechanism 25 has a pad 51 against which the hearth surrounding wear bricks 5b sent out from the brick removal opening 35 are placed, and damping parts 52A, 52B connected to the pad 51 and damping the impact applied to the pad 51.

[0074] The pad 51 is provided to stop the pendulum movement of the hearth surrounding wear brick 5b when the hearth surrounding wear brick 5b lifted by the electric chain block 16 moves in a pendulum motion by contacting the hearth surrounding wear brick 5b. The pad 51 is a flexible member supported at both ends by the movable parts 55A, 55B of the damping parts 52A, 52B described later. Since the pad 51 has flexibility, it comes into contact with the hearth surrounding wear brick 5b and changes from a hanging state to a tensioned state. When the pad 51 is in a free state not receiving an external force and in a hanging state, the height distance L4 between the part of the pad 51 connected to the damping parts 52A, 52B and the lower end of the pad 51 is appropriately set. The greater the height distance L4, the greater the amount of movement of the hearth surrounding wear brick 5b to the outside of the pedestal body 22 from when the hearth surrounding wear brick 5b comes into contact with the pad 51 until the damping sections 52A, 52B start to operate.

[0075] Examples of the above-mentioned flexible member for the pad 51 include a fiber rope and a chain chain as shown in Fig. 7. Fig. 7 is a diagram showing an example of the pad 51, showing only a part of the pad 51. As shown in Fig. 7, the pad 51 is preferably a chain chain formed by combining a plurality of chain elements.

[0076] In the case where the pad 51 is a chain, when the hearth surrounding wear brick 5b suspended from the electric chain block 16 comes into contact with the pad 51, the hearth surrounding wear brick 5b slides appropriately against the pad 51, so that excessive load is not applied to the pad 51 and the damping parts 52A and 52B. In addition, the strength of the pad 51 itself can be increased. Therefore, the durability of the anti-sway mechanism 25 can be increased.

[0077] In this embodiment, for convenience of explanation, the pad 51 will be described as a rope except in FIG.

[0078] 3 to 6 again, the damping parts 52A, 52B are arranged on the outer surface sides of the vertical walls 32A, 32B in the horizontal direction B1 in this embodiment. One damping part 52A is installed on a base plate 53A fixed to the column rib 42 on one vertical wall 32A side. The base plate 53A is a plate-like member arranged vertically, and is formed in a shape inclined with respect to the horizontal direction along the direction in which the damping parts 52A, 52B extend. The other damping part 52B is installed on a base plate 53B fixed to the column rib 42 on the other vertical wall 32B side. The base plate 53B is a plate-like member arranged vertically, and is formed in a shape inclined with respect to the horizontal plane along the direction in which the damping part 52B extends.

[0079] In this embodiment, the damping units 52A, 52B are configured to operate without using an external power source such as electricity or hydraulic pressure. When the ware bricks 5 are renewed, the inside of the converter 1 is hot and dusty, and the equipment having an external drive source is relatively prone to failure in this environment. For this reason, it is preferable to be able to operate the anti-sway mechanism 25 without using an external drive source, as in this embodiment.

[0080] The attenuation sections 52A and 52B are disposed obliquely upward so as to progress upward with increasing distance from the center of the gantry body 22 along the vertical direction A1.

[0081] The damping portions 52A, 52B include fixed portions 54A, 54B fixed to the vertical walls 32A, 32B via base plates 53A, 53B, and movable portions 55A, 55B supported by the fixed portions 54A, 54B and movable in conjunction with the pad 51.

[0082] In this embodiment, the fixed parts 54A and 54B are tubes, more specifically, cylindrical. The fixed parts 54A and 54B are fixed to the base plates 53A and 53B. The shape and size of the fixed parts 54A and 54B are appropriately set according to the size of the movable parts 55A and 55B. In this embodiment, the tip parts of the fixed parts 54A and 54B protrude from the vertical walls 32A and 32B in a side view.

[0083] In this embodiment, the movable parts 55A, 55B include rods that are inserted into the fixed parts 54A, 54B so as to be frictionally slidable. The movable parts 55A, 55B are elongated rods that are inclined with respect to the horizontal plane. More specifically, the movable parts 55A, 55B are disposed obliquely upward, inclining upward from the fixed parts 54A, 54B side toward the pad 51 side. The degree of this inclination is appropriately set according to the degree of movement of the movable parts 55A, 55B.

[0084] End members 56A, 56B such as eyebolts are fixed to the tips (upper ends) of the movable parts 55A, 55B. The end members 56A, 56B are formed in a shape that hooks onto the open ends of the fixed parts 54A, 54B. This allows the movable parts 55A, 55B to be supported by the fixed parts 54A, 54B. Ends of the pads 51 are fixed to the end members 56A, 56B.

[0085] Stoppers 57A, 57B may be provided at the base ends (lower ends) of the movable parts 55A, 55B. The stoppers 57A, 57B are disposed at the portions of the movable parts 55A, 55B that protrude from the fixed parts 54A, 54B. The stoppers 57A, 57B are configured to come into contact with the fixed parts 54A, 54B when the protrusion amount of the end members 56A, 56B from the fixed parts 54A, 54B reaches a predetermined value. This makes it possible to prevent the movable parts 55A, 55B from falling off the fixed parts 54A, 54B.

[0086] The above is the configuration of the anti-sway mechanism 25. Next, the anti-sway mechanism 26 will be described.

[0087] The anti-vibration mechanism 26 has a pad 61 against which the hearth surrounding wear bricks 5b sent out from the brick removal opening 36 are placed, and damping parts 62A, 62B connected to the pad 61 and damping the impact applied to the pad 61.

[0088] The pad 61 has the same configuration as the pad 51, so a description thereof will be omitted.

[0089] In this embodiment, the damping parts 62A and 62B are disposed outside the vertical walls 32A and 32B and outside the damping parts 52A and 52B of the anti-vibration mechanism 25 in the horizontal direction B1. One damping part 62A is installed on a base plate 63A fixed to the column rib 42 on one vertical wall 32A side. The base plate 63A is a plate-like member disposed symmetrically with the base plate 53A in the vertical direction A1 in a side view, and is disposed outside the damping part 52A in the horizontal direction B1 so as to avoid the damping part 52A. The other damping part 62B is installed on a base plate 63B fixed to the column rib 42 on the other vertical wall 32B side. The base plate 63B is a flat-plate-like member disposed symmetrically with the base plate 53B in the vertical direction A1 in a side view, and is disposed outside the damping part 52B in the horizontal direction B1 so as to avoid the damping part 52B.

[0090] In this embodiment, the attenuation sections 62A and 62B have the same configuration as the attenuation sections 52A and 52B, and therefore a description thereof will be omitted.

[0091] The above is a schematic configuration of the work platform 20. Next, the work of stacking the hearth surrounding wear bricks 5b using the work platform 20 will be described.

[0092] 8 and 9 are diagrams for explaining the work of stacking the hearth-surrounding wear bricks 5b. With reference to FIG. 8, when stacking the hearth-surrounding wear bricks 5b, the hoisting tool 5c of which is arranged closer to the brick-removal opening 35 of the brick-removal openings 35 and 36, on the hearth, a worker hooks the hook 16c of the electric chain block 16 closer to the brick-removal opening 35 onto the hoisting tool 5c. Next, the electric chain block 16 is operated to lift the hook 16c. When the hook 16c is lifted, the hearth-surrounding wear bricks 5b are lifted up and take an upright position as shown by the arrow E1. At this time, the main body 16a of the electric chain block 16 is arranged at a position outside the frame main body 22 in a plan view. Therefore, the hearth surrounding wear brick 5b hoisted by the hook 16c moves away from the stand body 22 through the brick removal opening 35 so as to move directly under the main body 16a of the electric chain block 16.

[0093] As a result, the hearth peripheral wear brick 5b comes into contact with the pad 51 of the anti-sway mechanism 25. The center of the pad 51 moves in the vertical direction A1 away from the rack body 22. As a result, the pad 51 receives the load from the hearth peripheral wear brick 5b. The movable parts 55A and 55B, which receive the load from the hearth peripheral wear brick 5b through the pad 51, frictionally slide against the fixed parts 54A and 54B while being displaced so as to extend from the fixed parts 54A and 54B (the fixed part 54B and the movable part 55B are not shown in Figs. 8 and 9).

[0094] That is, the energy of the swinging motion of the hearth peripheral wear brick 5b is converted into the frictional motion between the movable parts 55A, 55B and the fixed parts 54A, 54B, and the lifting motion of the movable parts 55A, 55B, and is attenuated (consumed). In this way, the energy of the swinging motion is absorbed by the work caused by the sliding motion of the movable parts 55A, 55B. The amount of work is determined by the weight of the movable parts 55A, 55B, the sliding distance of the movable parts 55A, 55B relative to the fixed parts 54A, 54B, and the frictional resistance between the fixed parts 54A, 54B and the movable parts 55A, 55B. The amount of work can be easily adjusted by changing the weight of the movable parts 55A, 55B.

[0095] When the movable parts 55A, 55B are moved by a predetermined amount (for example, stroke amount st1) so as to extend from the fixed parts 54A, 54B, the hearth-bottom-periphery wear brick 5b reaches just below the main body 16a of the electric chain block 16, and the vibration of the hearth-bottom-periphery wear brick 5b is suppressed by the vibration-stop mechanism 25. That is, the hearth-bottom-periphery wear brick 5b reaches just below the main body 16a of the electric chain block 16 with the lifting of the center of the pad 51 when the pad 51 is stretched and the sliding of the movable parts 55A, 55B.

[0096] Next, as shown in Fig. 9, the hearth peripheral wear brick 5b is further raised as shown by the arrow E2 by the operation of the electric chain block 16, and the hearth peripheral wear brick 5b is released from contact with the pad 51. Then, the movable parts 55A, 55B move downward by their own weight. Then, the movable parts 55A, 55B descend to their original positions, that is, to the positions where the end members 56A, 56B contact the fixed parts 54A, 54B. The hearth peripheral wear brick 5b is also moved downward as shown by the arrows E3, E4 by the electric chain block 16, and is thereby stacked on the hearth peripheral permanent brick 4b.

[0097] In addition, when the hearth peripheral wear brick 5b, whose lifting tool 5c is arranged closer to the brick removal opening 36 of the brick removal openings 35, 36, is stacked on the hearth, the hearth peripheral wear brick 5b is removed from the pallet 23 through the brick removal opening 36. In this case, the hearth peripheral wear brick 5b is stacked on the hearth peripheral permanent brick 4b while the vibration is suppressed by the vibration prevention mechanism 26 by the same operation as described above as the work of removing the hearth peripheral wear brick 5b from the brick removal opening 35.

[0098] In addition, in a plan view, the range in which the hearth surrounding wear bricks 5b can be removed from the rack body 22 is the sector-shaped areas R1 and R2 in a plan view of Fig. 6. The area R1 is an area between the pair of vertical walls 32A and 32B at the brick removal opening 35, and the area R2 is an area between the pair of vertical walls 32A and 32B at the brick removal opening 36.

[0099] Then, the upper raceway of the turntable 21 and the frame body 22 are moved appropriately according to the position where the hearth peripheral wear bricks 5b are to be stacked on the hearth, thereby changing the positions of the sector-shaped regions R1 and R2. By such an operation, the hearth peripheral wear bricks 5b can be stacked on the hearth over the entire circumferential area of ​​the converter 1.

[0100] When the loading of the hearth peripheral wear bricks 5b is completed, the work platform 20 and the scaffolding 18 are removed from inside the converter 1. Thereafter, wear bricks 5 in other locations such as the body portion 7 are assembled inside the shell 2 using a furnace construction tower (not shown) or the like.

[0101] As described above, according to this embodiment, the hearth peripheral wear bricks 5b on the pallet 23 are lifted by the electric chain block 16, and then the hearth peripheral wear bricks 5b are stacked on the hearth peripheral permanent bricks 4b. In this stacking operation, if the hearth peripheral wear bricks 5b fall off the pallet 23 on the frame body 22, the collapsed hearth peripheral wear bricks 5b must be placed back on the pallet 23, which is time-consuming. However, since the vertical walls 32A and 32B are provided on the sides of the pallet 23, the collapse of the hearth peripheral wear bricks 5b can be suppressed. In addition, the hearth peripheral wear bricks 5b are assembled in large numbers along the circumferential direction C1 of the converter 1 in a plan view, centered on the pallet 23 (the hearth central portion 11). On the other hand, if the vertical walls 32A and 32B are present, the hearth peripheral wear bricks 5b cannot be removed from the pallet 23 in the horizontal direction B1 where the vertical walls 32A and 32B exist. However, the pallet 23 can be rotated in the circumferential direction C1 by the rotating table 21. This allows the brick removal openings 35, 36 to be rotated and moved to any position in the circumferential direction C1. Therefore, the vertical walls 32A, 32B do not get in the way of the work of stacking the hearth peripheral wear bricks 5b, and the work of stacking the hearth peripheral wear bricks 5b can be reduced. As a result, it is possible to prevent the hearth peripheral wear bricks 5b from collapsing from the pallet 23 installed at the converter hearth, and the work of stacking the hearth peripheral wear bricks 5b can be reduced.

[0102] In addition, according to this embodiment, the brick removal openings 35, 36 are provided on both sides of the rack body 22 in the vertical direction A1. As a result, the hearth surrounding wear brick 5b with the hoisting tool 5c arranged on the brick removal opening 35 side can be removed from the brick removal opening 35, and the hearth surrounding wear brick 5b with the hoisting tool 5c arranged on the brick removal opening 36 side can be removed from the brick removal opening 36. As a result, the hearth surrounding wear brick 5b can be removed from two directions, and the hearth surrounding wear brick 5b can be efficiently carried out from the pallet 23.

[0103] In addition, according to this embodiment, when the hearth peripheral wear bricks 5b are stacked using the electric chain block 16, the lifted hearth peripheral wear bricks 5b swing significantly. If you wait for this touching motion to stop naturally, it will take too much time and be inefficient. In addition, since the weight of the hearth peripheral wear bricks 5b exceeds 50 kg, for example, it is difficult to manually stop the swinging motion using a jig such as a metal hand hook. Therefore, it is possible to directly suppress the swinging motion of the hearth peripheral wear bricks 5b by hand to stop the swinging. In this case, physical strength is required to stop heavy bricks weighing more than 50 kg by hand. Due to the above-mentioned problems, an efficient swing-stop technology for the hearth peripheral wear bricks 5b that does not rely on human power has been required. And in this embodiment, the swing-stop mechanism 25, 26 is provided, so that the swinging motion of the hearth peripheral wear bricks 5b lifted by the electric chain block 16 can be efficiently suppressed without using human hands.

[0104] In addition, according to this embodiment, the anti-sway mechanism 25 has the pad 51 and the attenuation parts 52A and 52B that attenuate the impact applied to the pad 51. According to this configuration, the impact applied to the pad 51 from the hearth peripheral wear brick 5b is attenuated by the attenuation parts 52A and 52B. This can reduce the impact on the pad 51 and the hearth peripheral wear brick 5b, increase the durability of the pad 51, and suppress damage to the hearth peripheral wear brick 5b. Note that the anti-sway mechanism 26 can also exert the same effect as the anti-sway mechanism 25, so the description of the effect of the anti-sway mechanism 26 may be omitted.

[0105] In addition, according to this embodiment, the damping parts 52A, 52B include movable parts 55A, 55B, which are rods supported by the fixed parts 54A, 54B, which are cylinders, and which can move in conjunction with the pad 51. The movable parts 55A, 55B are inserted into the fixed parts 54A, 54B so as to be frictionally slidable. With this configuration, the movable parts 55A, 55B are driven by the load from the hearth peripheral wear bricks 5b, and it is not necessary to prepare a separate drive source for operating the movable parts 55A, 55B. Therefore, the configuration of the anti-sway mechanism 25 can be simplified, and the anti-sway mechanism 25 is less likely to break down, and even if the anti-sway mechanism 25 does break down, it can be easily repaired.

[0106] In addition, according to this embodiment, the movable parts 55A, 55B are arranged obliquely upwards, inclining upwards as they move from the fixed parts 54A, 54B side to the pad 51 side. With this configuration, the movable parts 55A, 55B can slide relative to the fixed parts 54A, 54B under the load from the hearth peripheral wear brick 5b, and then return to their original positions by their own weight. This eliminates the need to separately prepare a drive source for operating the movable parts 55A, 55B. Therefore, the configuration of the anti-sway mechanism 25 can be further simplified.

[0107] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made to the present invention as long as they fall within the scope of the claims.

[0108] For example, a counterweight may be provided on the movable parts 55A and 55B at a position spaced apart from the end members 56A and 56B. By providing the counterweight, the movable parts 55A and 55B can absorb more energy from the hearth peripheral wear bricks 5b, and the vibration prevention effect of the hearth peripheral wear bricks 5b can be improved.

[0109] In addition, in the damping parts 52A, 52B of the anti-vibration mechanisms 25, 26, the fixed parts 54A, 54B are cylinders and the movable parts 55A, 55B are rods. However, this is not necessarily the case. For example, an electric motor may be used to return the movable parts 55A, 55B to their original positions after they slide relative to the fixed parts 54A, 54B. Furthermore, hydraulic dampers or the like may be used as the damping parts 52A, 52B. [Industrial Applicability]

[0110] The present invention can be widely applied as a work platform for laying hearth bricks. [Explanation of symbols]

[0111] 1 Converter 5b Hearth Surrounding Wear Bricks (Hearth Bricks) 20. Hearth brick laying work platform 21 Rotating table 23 Palette 25,26 Anti-vibration mechanism 31 Pallet placement section 32A,32B Vertical wall 33A, 33B Taper Guide 34 Ribs 35,36 Brick removal frontage 51,61 Hit 52A, 52B, 62A, 62B Attenuation section 54A,54B Fixed part 55A,55B Movable part L1+L2 gap width L3 Width of hearth brick

Claims

1. A rotating table installed at the bottom of the converter; A pallet placement unit that is placed on the rotating table and can be rotated about a vertical axis by the rotating table; A pallet is placed on the pallet placement section, and a long hearth brick is placed on the hearth in a horizontal position. The hearth brick is placed on the pallet placement section in a vertical position. A pair of vertical walls arranged to sandwich the pallet and rising from the pallet placement portion; A pair of brick removal openings formed by the pair of vertical walls and opened in two opposite directions in a horizontal direction for sending out the hearth bricks on the pallet from between the pair of vertical walls; a vibration prevention mechanism for preventing the hearth bricks, which are lifted from the brick removal opening and delivered in a vertical position, from swinging out of the space between the pair of vertical walls through the brick removal opening due to the lifting action; Equipped with The anti-sway mechanism includes: A pad on which the hearth bricks sent from the brick removal opening are placed, the pad being a flexible member that is bridged between a pair of the vertical walls at the brick removal opening; A pair of damping parts connected to the pad and installed on both sides of the pad in a longitudinal direction to damp an impact applied to the pad; having The pair of damping sections include a pair of fixed sections fixed to the pair of vertical walls, and a pair of movable sections supported by the pair of fixed sections and movable in conjunction with the pad, A work platform for laying hearth bricks, in which a pair of movable parts receive the load from the swaying hearth bricks through the pads, and perform a sliding movement relative to a pair of fixed parts, thereby damping the swaying movement.

2. The hearth brick laying work platform according to claim 1 , wherein the pad includes a chain formed by combining a plurality of chain elements.

3. The fixing portion includes a tube, 3. The hearth brick laying work platform according to claim 1, wherein the movable portion includes a rod that is inserted into the cylinder so as to be capable of sliding by friction.

4. The work platform for stacking hearth bricks according to any one of claims 1 to 3, wherein the movable part is arranged diagonally upward, inclining upward as it proceeds from the fixed part side to the pad side in the direction in which the pair of brick removal openings are aligned.

5. A taper guide is provided at the upper end of the vertical wall, The hearth brick laying work platform according to any one of claims 1 to 4, wherein the taper guide is inclined so as to move away from the pallet as it advances upward.

6. The hearth brick laying work platform according to any one of claims 1 to 5, further comprising a rib for suppressing inclination of the vertical wall.

7. A work platform for stacking hearth bricks as described in any one of claims 1 to 6, wherein the gap width, which is the value obtained by subtracting the width of the pallet from the distance between a pair of the vertical walls, is set to be less than the width of the hearth brick having the smallest width among the plurality of hearth bricks placed on the pallet.

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