JPH09182942A - Upper cover of tundish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent thermal deformation without increasing a handling time and to maintain good heat insulation by pressing each other gaps of split upper covers and arranging an elastic member and stopper to suppress air leakage from the gaps. SOLUTION: The gaps of each split upper cover 2 are pressed each other by a stopper 8 and an elastic member 9 (spring) arranged to the upper face of a tundish main body 1. Further, the split upper covers 2 are bound by a connecting bar 6 along the longitudinal direction of the tundish 1, both ends of the connecting bar are locked to the tundish main body 1 by a fastening fitting 7. By this method, the gaps are closely adhered during operation and air leakage is suppressed. Further, the split covers can be handled together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tundish upper lid, and more particularly to a tundish for a continuous casting machine for molten steel which is required to be strictly airtight in terms of product quality, or which is continuously used in tilted waste. Related to the top lid.

[0002]

2. Description of the Related Art Conventionally, the upper lid of a tundish used in a continuous casting machine for molten steel is usually divided into several pieces and placed on the body of the tundish. As a typical example thereof, one used in a two-strand slab continuous casting machine is shown in FIG. 2, in which the upper lid 2 is divided into three parts. As shown in FIG.
When it is used, that is, when molten steel is injected, the thermal deformation (convex downward) of the upper lid 2 is large when it is one piece as shown in
Also, the residual deformation (convex upward) is large, which is not desirable from the viewpoint of heat insulation. For heat insulation, the tundish body 1 and the upper lid 2 may be fixed with a bolt nut 5, but if the rigidity of the upper lid 2 is increased, excessive tension is applied to the bolt 5, and if the rigidity is decreased, the bolt is lowered. Although the tension of No. 5 was small, there was a defect that the residual deformation was increased.

Therefore, recently, from the viewpoint of reducing the cost of the refractory lining material of the tundish 1, instead of using the tundish 1 having a new refractory construction for each casting, when the casting is finished, the tundish is finished. There is an increasing number of operations in which the molten steel and the slag remaining in the No. 1 are tilted by about 90 ° to be discharged and reused. On that occasion,
It is necessary to prevent the upper lid 2 from falling, and as a means for solving all of the above problems, as shown in FIG. 4, it is divided into multiple parts to reduce deformation, and bolts 5 are used to prevent falling. In this way, since the deformation of the upper lid 2 is small, the tensile force applied to the bolt 5 can be suppressed to a small value.

However, the upper lid 2 as shown in FIG. 4 does not cause a problem during use, but the tundish body 1
When installing or removing to and from, bolt nut 5
There was a drawback that the upper lids 2 had to be handled after removing the above. This delays the casting operation and adversely affects the productivity and cost of the slab.

[0005]

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a tundish upper lid capable of preventing thermal deformation and maintaining good heat insulating property without increasing the trouble of handling. I am trying.

[0006]

In order to achieve the above object, the inventor has eagerly made efforts to develop an upper lid which satisfies the requirements of reduction of handling labor, prevention of falling when the tundish is tilted, thermal deformation and heat insulation. The present invention embodies the results thereof, that is, a tundish of upper lids for temporarily insulating and holding molten steel to be injected into a casting machine, wherein a gap between the divided upper lids. Which are pressed against each other to prevent air leakage from the gaps and the both sides of the tundish in the longitudinal direction of the tundish, and the divided upper lids are bound together, and are pressed against the upper surface of the tundish or pulled from the upper surface. An upper lid of a tundish comprising: two connecting rods to be raised; a supporting member for the upper lid of the connecting rod; and stoppers for locking both ends of the connecting rod to the tundish.

The present invention also provides a tundish upper lid characterized in that the stopper of the connecting rod is constructed so as not to be released when the tundish is tilted. Since the upper lid of the tundish has such a structure, the labor required for handling is reduced as compared with the conventional one, and the thermal deformation can be prevented and the heat insulating property can be more excellently secured. As a result, it is possible to improve the productivity of the slab, reduce the production cost, and save labor.

[0008]

1 shows an example of a tundish upper lid according to the present invention. Since the upper lid 2 is divided into three, the deformation due to heat is relieved as usual. The gap between the divided upper lids 2 is pressed against each other by a stopper 8 and an elastic member (spring) 9 provided on the upper surface of the tundish main body 1. As a result, the gap is in close contact during use and air leakage from the gap is suppressed. The elastic member may have a pressing effect equivalent to that of a spring, and a hydraulic cylinder may be used, for example. Further, the thermal expansion of each of the upper lids is released by the entire three upper lids by this pressing.

Further, in the present invention, the divided upper lid is
The tundish 1 is bound by a connecting rod 6 along the longitudinal direction, and both ends of the connecting rod 6 are locked to the tundish main body 1 by the stoppers 7. Therefore, the divided upper lids can be handled collectively at the time of handling. A plurality of supporting members 10 for supporting the connecting rod 6 are attached to each of the divided upper lids, and the size of the connecting rod 6 is such that it can be lifted by a crane or the like.

Further, in the present invention, in consideration of the tilting of the tundish, the stopper 7 for locking the connecting rod is structured so as not to be disengaged by the tilting. For example, the stopper 7 shown in FIG. 1 has such a shape that the upper lid does not drop even when the tundish 1 is tilted so that its bottom surface comes to the front of the paper surface. That is, at a constant tilt angle, the connecting rod does not drop from the cut in the recess of the metal fitting. Further, depending on the case, a structure may be adopted in which a bolt or the like is arranged at the break to stop it.

Since the tundish shown in FIG. 1 has a slag outlet on the back side, the slag is made to flow out from the slag outlet 11 by tilting the tundish to the far right with respect to the paper surface. . As for the implementation results, due to the tundish inclination,
In a two-strand slab continuous casting machine that discharges slag and the like, the results of comparing the conventional type upper lid shown in FIG. 4 with the upper lid of the present invention (FIG. 1) are shown. Although the degree of breakage of air in the tundish was the same for both, (1) the life of the upper lid according to the present invention was 1.2 times that of the conventional one (deformation was suppressed due to escape of thermal expansion). (2) The replacement time of the upper lid (2) can be significantly shortened to 1 hour as compared with the conventional 8 hours.

[0012]

As described above, according to the present invention, it is possible to provide a tundish upper lid capable of preventing thermal deformation and maintaining good heat insulating property without increasing the handling labor compared with the conventional one. Further, by attaching the upper lid of the present invention, the tundish can be easily tilted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an upper lid of a tundish according to the present invention.

FIG. 2 is an example of a conventional tundish top cover.

FIG. 3 is another example of a conventional tundish upper lid.

FIG. 4 is another example of a conventional tundish upper lid.

[Explanation of symbols]

 1 Tundish (main body of tundish) 2 Top lid 3 Hole directly above immersion nozzle 4 Filling port from ladle to tundish 5 Bolt (bolt nut) for attaching top lid 6 Connecting rod 7 Stopper 8 Stopper 9 Elastic member 10 Support

Claims (2)

[Claims] 1. A tundish of upper lids for temporarily insulating and holding molten steel to be injected into a casting machine, wherein gaps between the divided upper lids are pressed against each other to prevent air leakage from the gaps. An elastic member and a stopper to be restrained, two connecting rods located on both side surfaces in the longitudinal direction of the tundish, bound the divided upper lids, pressed against the upper surface of the tundish or pulled up from the upper surface, and the connecting rod. An upper lid for a tundish, comprising: a support tool for the upper lid and stoppers for locking both ends of the connecting rod to the tundish. 2. The upper lid of the tundish according to claim 1, wherein the stopper of the connecting rod has a structure which is not released when the tundish is tilted.