TECHNICAL FIELD
The present invention relates to a ladle crane that is installed in an iron mill, a steel mill, or the like.
BACKGROUND ART
As a typical ladle crane, for example, that disclosed in Patent Citation 1 is known.
Patent Citation 1: Japanese Unexamined Patent Application, Publication No. HEI-11-268881
DISCLOSURE OF INVENTION
However, the ladle crane disclosed in Patent Citation 1 is configured such that both end sections of auxiliary girders on which an auxiliary trolley travels are directly coupled (connected) to substantially the central parts of end ties (bridges) . Thus, there is a problem in that the construction period at the time of new installation or reassembly and the construction period at disassembly are extended because at the time of new installation or reassembly, first, the auxiliary girders must be attached to the end ties, and then, the auxiliary trolley must be installed on the auxiliary girders, and, at the time of disassembly, first, the auxiliary trolley must be removed from the auxiliary girders, and then, the auxiliary girders must be removed from the end ties.
The present invention has been conceived in light of the above-described situation, and an object thereof is to provide a ladle crane capable of shortening the construction period at the time of new installation or reassembly and the construction period at disassembly.
The present invention employs the following solutions to solve the above-described problem.
In the ladle crane according to the present invention, a melting pot suspended by a main hoisting hook of a main
hoisting gear installed on a main trolley that travels on first transverse rails laid along two main girders is tilted by an auxiliary hoisting hook of an auxiliary hoisting gear installed on an auxiliary trolley that travels on second transverse rails laid along two auxiliary girders, and thereby, molten metal contained in the melting pot is poured out, wherein first end sections of the auxiliary girders and second end sections of the auxiliary girders are respectively connected to each together via connecting beams.
According to such a ladle crane, a first end section of a first auxiliary girder and a first end section of a first connecting beam are coupled; a first end section of a second auxiliary girder and a second end section of the first connecting beam are coupled; a second end section of the first auxiliary girder and a first end section of the second connecting beam are coupled; and a second end section of the second auxiliary girder and a second end section of the second connecting beam are coupled. Therefore, the two auxiliary girders and the two connecting beams can be configured as an integrated structure; the rigidity of the integrated structure constituted of the two auxiliary girders and the two connecting beams can be improved; and the two auxiliary girders and the two connecting beams can be transported as an integrated structure.
Accordingly, the construction period at the time of new installation or reassembly and the construction period at disassembly can be shortened.
It is preferable that the above-mentioned ladle crane be constituted such that the auxiliary girders, the connecting beams, the auxiliary trolley, and the auxiliary hoisting hook are configured to be transportable as an integrated structure.
According to such a ladle crane, since the auxiliary girders, the connecting beams, the auxiliary trolley, and the
auxiliary hoisting hook can be transported as an integrated structure, the construction period at the time of new installation or reassembly and the construction period at disassembly can be shortened.
It is preferable that the above-mentioned ladle crane be constituted such that the second transverse rails are respectively arranged on opposing wall surfaces of first and second auxiliary girders.
According to such a ladle crane, since the second transverse rails are arranged so as to be positioned lower than the upper surfaces of the auxiliary girders, the heightwise dimension when the auxiliary trolley is placed on the second transverse rails can be reduced.
Accordingly, transportation is possible while the auxiliary trolley is placed on the second transverse rails, i.e., while the auxiliary trolley and the auxiliary hoisting gear (including the auxiliary hoisting hook) are placed on the integrated structure constituted of the two auxiliary girders and the two connecting beams, and the construction period at the time of new installation or reassembly and the construction period at disassembly can be shortened even more.
A method of assembling a ladle crane according to the present invention is a method of assembling a ladle crane in which melting pot suspended by a main hoisting hook of a main hoisting gear installed on a main trolley that travels on first transverse rails laid along two main girders is tilted by an auxiliary hoisting hook of an auxiliary hoisting gear installed on an auxiliary trolley that travels on second transverse rails laid along two auxiliary girders, and thereby, molten metal contained in the melting pot is poured out, wherein the auxiliary girders, the auxiliary trolley, the auxiliary hoisting hook, and the connecting beams that couple first end sections of the auxiliary girders which each other
and second end sections of the auxiliary girders with each other are assembled as an integrated structure at a location different from an installation location where the ladle crane is installed, and the integrated structure is transported to the installation location using transporting means, and then the integrated structure is installed at a predetermined location using installing means.
According to such a ladle crane, since the auxiliary-girders, the connecting beams, the auxiliary trolley, and the auxiliary hoisting hook are transported and installed (assembled) as an integrated structure, the construction period at the time of new installation or reassembly can be shortened.
According to the present invention, there is an advantage in that the construction period at the time of new installation or reassembly and the construction period at disassembly can be shortened.
BRIEF DESCRIPTION OF DRAWINGS
[FIG. 1] FIG. 1 is a schematic structural diagram of an embodiment of a ladle crane according to the present invention.
[FIG. 2] FIG. 2 is a plan view from above of a main section of the ladle crane according to this embodiment.
[FIG. 3] FIG. 3 is a sectional view taken along a line A-A in FIG. 2.
[FIG. 4A] FIG. 4A is an enlarged view of the main section of FIG. 3 and is an enlarged view of the main section of an auxiliary girder positioned on the left side in FIG. 3.
[FIG. 4B] FIG. 4B is an enlarged view of the main section of FIG. 3 and is an enlarged view of the main section of an auxiliary girder positioned on the right side in FIG. 3.
Explanation of Reference:
1: main girder
1A: auxiliary girder
la: first transverse rail
lb: second transverse rail
2: main trolley
3: auxiliary trolley
5: main hoisting hook
7A: auxiliary hoisting hook
8: melting pot
10: main hoisting gear
11: auxiliary hoisting gear
12: connecting beam
14: wall surface
100: ladle crane
B: auxiliary girder block body (integrated structure)
Fe: molten metal
Best Mode for Carrying Out the Invention
An embodiment of a ladle crane according to the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic structure diagram of a ladle crane 100. As illustrated in FIG. 1, the ladle crane (ladle crane) 100 is a type of ceiling crane and is installed in an iron mill or a steel mill for use in an operation such as pouring molten steel 8 into a tundish or a converter, which are not shown, by tilting a melting pot (ladle) 8 after transferring molten steel (molten metal) Fe from an open hearth furnace, an electric furnace, or the like, which are not shown, to the melting pot 8 and transporting the melting pot 8. Since the ladle crane 100 handles the melting pot 8, which is a high temperature object, the molten steel Fe is taken out from the melting pot 8 with hoisting the melting pot 8 by a main
hoisting gear 10 and tilting the melting pot 8 by lifting the lower part of the melting pot 8 with an auxiliary hoisting gear 11.
Next, the above-mentioned operation will be described with reference to FIG. 1. As illustrated in FIG. 1, a main trolley 2 provided with the main hoisting gear 10 is installed on first transverse rails la, which are laid on main girders 1 running along traveling lanes 9 laid in a ceiling of a facility (not shown), and an auxiliary trolley 3 provided with the auxiliary hoisting gear 11 is installed on second transverse rails lb laid on auxiliary girders 1A (see FIGs. 2 to 4B) . In some cases, cranes, etc. receiving large hoisting loads may have two hoisting mechanisms, where the above-mentioned main hoisting gear hoists a heavy load at low speed and the above-mentioned auxiliary hoisting gear hoists a light load at high speed.
The main hoisting gear 10 engages a main hoisting hook 5 with a shaft 8a of the melting pot 8 and suspends the melting pot 8 on a wire 4. The auxiliary hoisting gear 11 moves the auxiliary trolley 3 to move an auxiliary hoisting hook 7A, which is suspended on a wire 6, close to the melting pot 8 and hooks the auxiliary hoisting hook 7A onto a tilting metal piece 8b provided on a sidewall of the melting pot 8. Then, the auxiliary hoisting gear 11 tilts the melting pot 8 around the shaft 8a by raising the auxiliary hoisting hook 7A (see the two-dot chain line in the drawing), and pours the molten steel (Fe) contained in the melting pot 8 into the tundish, etc.
FIG. 2 is a plan view from above of a main section of the ladle crane 100 according to this embodiment, and FIG. 3 is a sectional view taken along a line A-A in FIG. 2. FIGs. 4A and 4B are enlarged views of main sections in FIG. 3.
First, as illustrated in FIG. 2, both end sections of the
two auxiliary girders 1A are coupled (connected) by connecting beams 12, respectively. That is, the two auxiliary girders 1A and the two connecting beams 12 form an integrated structure. In other words, the two auxiliary girders 1A and the two connecting beams 12 are configured such that they can be transported as an integrated structure. Moreover, an integrated structure (hereinafter referred to as "auxiliary girder block body") B constituted of the two auxiliary girders 1A and the two connecting beams 12 is configured such that the lower surfaces of the two connecting beams 12 and the upper surfaces at substantially the central parts of two end ties 13 contact (surface-contact) each other, i.e., such that the auxiliary girder block body B can be placed on the end ties 13.
Both end sections of the two main girders 1 are respectively coupled (connected) to both end sections of the two end ties 13 via securing means (for example, bolts and nuts), and the auxiliary girder block body B placed on the end ties 13 via coupled (connected) to the end ties 13 with securing means (for example, bolts and nuts).
Next, as illustrated in FIG. 3, the auxiliary girders 1A are each formed such that the shape thereof in a cross-sectional view presents a right-angle trapezium. That is, side surfaces (side surfaces at which a first auxiliary girders 1A opposes a second auxiliary girder 1A) 14 (see FIGs. 4A and 4B) positioned on the inner sides of the auxiliary girders 1A are tilted such that they gradually approach each other toward the bottom. Moreover, as illustrated in FIGs. 4A and 4B, pedestals 15 are individually provided at the lower parts of the side surfaces 14 to support the second transverse rails lb. The pedestals 15 include horizontal plates 16 in which the rails lb are placed on upper surfaces thereof and ribs 17 that support the horizontal plates 16. Reference numeral 18 in
FIGs. 4A and 4B represents the wheels of the auxiliary trolley 3 that roll on the second transverse rails lb.
At new installation or reassembly of the ladle crane 100, the auxiliary girders 1A, the auxiliary trolley 3, the auxiliary hoisting hook 7A, and the connecting beams 12 are assembled as the auxiliary girder block body (integrated structure) B at a location (for example, assembly plant) different from the installation location where the ladle crane is installed (or assembly location where the ladle crane 100 is assembled (or reassembled)), and the auxiliary girder block body B is transported to the installation location (in the building mentioned before) using transporting means (for example, a trailer, a ship, etc.); then, the auxiliary girder block body B can be installed at a predetermined location of the installation location, using installing means (for example, a crane).
In the ladle crane 100 according to this embodiment, a first end section of a first auxiliary girder 1A and a first end section of a first connecting beam 12 are coupled; a first end section of a second auxiliary girder 1A and a second end section of the first connecting beam 12 are coupled; a second end section of the first auxiliary girder 1A and a first end section of the second connecting beam 12 are coupled; and a second end section of the second auxiliary girder 1A and a second end section of the second connecting beam 12 are coupled. Therefore, the two auxiliary girders 1A and the two connecting beams 12 can be transported as the auxiliary girder block body B. That is, the two auxiliary girders 1A and the two connecting beams 12 can be attached to an integrated structure constituted of the two main girders 1 and the two end ties 13 as the auxiliary girder block body B. Moreover, the two auxiliary girders 1A and the two connecting beams 12 can be removed from the integrated structure constituted of
the two main girders 1 and the two end ties 13 as the auxiliary girder block body B.
Accordingly, the construction period at the time of new installation or reassembly and the construction period at disassembly can be shortened.
Since the second transverse rails lb are arranged so as to be positioned lower than the upper surfaces of the auxiliary girders 1A, i.e., below the auxiliary girders 1A, the heightwise dimension when the auxiliary trolley 3 is placed on the second transverse rails lb can be reduced. With the ladle crane 100 according to this embodiment, the conventional dimension of approximately 5 m can be reduced to approximately 3.5 m.
Accordingly, transportation is possible while the auxiliary trolley 3 is placed on the second transverse rails lb, i.e., while the auxiliary trolley 3 and the auxiliary hoisting gear 11 (including the auxiliary hoisting hook 7A) are placed on the auxiliary girder block body B constituted of the two main girders 1 and the two connecting beams 12, and the construction period at the time of new installation or reassembly and the construction period at disassembly can be shortened even more.

WE CLAIM:
1. A ladle crane in which a melting pot suspended by a main
hoisting hook of a main hoisting gear installed on a main
trolley that travels on first transverse rails laid along two
main girders is tilted by an auxiliary hoisting hook of an
auxiliary hoisting gear installed on an auxiliary trolley that
travels on second transverse rails laid along two auxiliary
girders, and thereby, molten metal contained in the melting
pot is poured out,
wherein first end sections of the auxiliary girders and second end sections of the auxiliary girders are respectively connected to each together via connecting beams.
2. The ladle crane according to Claim 1, wherein the
auxiliary girders, the connecting beams, the auxiliary
trolley, and the auxiliary hoisting hook are configured to be
transportable as an integrated structure.
3 The ladle crane according to Claim 1, wherein the second transverse rails are respectively arranged on opposing wall surfaces of first and second auxiliary girders.
4. A method of assembling a ladle crane in which a melting pot suspended by a main hoisting hook of a main hoisting gear installed on a main trolley that travels on first transverse rails laid along two main girders is tilted by an auxiliary hoisting hook of an auxiliary hoisting gear installed on an auxiliary trolley that travels on second transverse rails laid along two auxiliary girders, and thereby, molten metal contained in the melting pot is poured out,
wherein the auxiliary girders, the auxiliary trolley, the auxiliary hoisting hook, and the connecting beams that couple
first end sections of the auxiliary girders which each other and second end sections of the auxiliary girders with each other are assembled as an integrated structure at a location different from an installation location where the ladle crane is installed, and the integrated structure is transported to the installation location using transporting means, and then the integrated structure is installed at a predetermined location using installing means.
5. A ladle crane substantially as herein described with reference to and as illustrated by the accompanying figures.
6. A method of assembling a ladle crane substantially as herein described with reference to and as illustrated by the accompanying figures.