JP7257894B2 - molten metal container lid - Google Patents

Description

TECHNICAL FIELD The present invention relates to lids for molten metal vessels such as ladles, vacuum degassers, and tundishes used in iron manufacturing processes.

Molten metal containers such as ladles, vacuum degassers, and tundishes are provided with lids on the top to prevent outside air from entering and to retain heat. This lid has a structure in which a heat-insulating refractory material is lined on the inside of the steel shell, but the refractory lining deteriorates and wears as the number of times it is used increases, so the refractory lining needs to be repaired. In that case, it is necessary to remove the lid from the molten metal container, move the lid, and turn the lid over at the work site (repair site) where the repair is performed so that the refractory lining side faces upward.

Here, the reversing method for the conventional general tundish lid shown in FIG. 6 will be described below. 6(a) is a top view of the tundish lid, FIG. 6(b) is a bottom view of the tundish lid, FIG. 6(c) is a front view of the tundish lid, and FIG. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1(a);
A tundish lid 1 shown in FIG. 6 has a quadrangular shape in which opposite sides are not parallel, and a monolithic refractory 12 is lined inside a steel shell 11 . In addition, the first suspension rings 2 are provided at four locations in total, two on each side of the long side surface of the steel shell 11 on the upper surface 13 side. These four first suspension rings 2 are provided by welding a rectangular metal plate having suspension holes 21 to the steel shell 11, and when the lid 1 is attached to or removed from the tundish, the lid 1 is attached. It is provided for lifting with a crane.

When the lid 1 of the tundish is turned over, as shown in FIG. 7, hooks 31 are hooked to the hanging holes 21 of the two opposing first hanging rings 2, respectively, and hung by the crane 3 at two points. The lid 1 is lifted up so that it is almost vertical by , and the lid 1 is turned over by moving the crane 3 in the horizontal direction (the direction of the arrow in FIG. 7(c)) while the bottom of the lid 1 is in contact with the floor. rice field.
However, in such a reversing method, three people, the crane operator, the signal person, and the reversing worker (assistant) of the lid, need to lift the heavy lid high, and the lid when the ground is cleared. However, there is a problem that the rotation of the lid is stopped by touching the lid near the lid, which is dangerous.

In order to address such a problem, Patent Document 1 discloses that "a main hanger for the furnace lid is provided below the center of gravity of the furnace lid and is eccentric in the left-right direction. A refining characterized by providing an auxiliary hoisting tool near the end on the side of reversing to the other side, suspending the auxiliary hoisting tool with a rope, and providing a rope guide that allows the rope to be wound around the furnace lid. A furnace lid reversing device” has been proposed (see the scope of utility model registration claims). However, in the case of a cover with a spherical upper surface like the lid for a refining furnace disclosed in Patent Document 1, it is possible to wind the cable following the cable guide, but as shown in FIG. A rectangular plate-shaped lid such as the lid of a tundish cannot be provided with a cable guide and cannot be applied.

In addition, in Patent Document 2, "A reversing frame for reversing together with a heavy object such as an upper lid of a degassing tank horizontally placed and fixed on a pedestal is provided on both sides of the reversing frame at the center of gravity of the reversing frame. rotatably supported via a pair of rotating shafts eccentrically disposed from the center, a sheave for reversing is fixed to one of the rotating shafts, and wires for forward and reverse rotation are attached to the outer circumference of the sheave A reversing device for heavy objects such as the upper lid of a degassing tank, characterized in that the reversing device is characterized by being fixed and provided with movable back and forth stoppers for locking the reversing frames on the mounts perpendicular to the pair of rotating shafts. has been proposed (see claims). However, in this reversing device, it is necessary to manufacture a stand and a reversing frame for each shape of the lid to be reversed, and it is necessary to set up a place for the reversing device including the stand and the reversing frame in the lid repair shop. It is practically impossible to apply in existing repair yards because of the limited effective use area.

Microfilm of Japanese Utility Model Application No. 61-68709 (Japanese Utility Model Application No. 62-181893) JP-A-4-133995

The problem to be solved by the present invention is to provide a molten metal container that can be turned over by a small number of people without touching the lid, is not affected by the shape of the lid during the turnover operation, and does not require large-scale capital investment. To provide a lid.

According to one aspect of the present invention, the following molten metal container lid is provided.
A molten metal container lid provided with a first suspension ring and a second suspension ring,
The first suspension ring is provided such that the center of the suspension hole passes through the center of gravity of the lid and is located on the upper surface side of a plane parallel to the bottom surface of the lid and is eccentric from the center of gravity of the lid,
The second hanging ring is provided at least two places so that the center of the hanging hole passes through the center of gravity of the lid and is positioned closer to the bottom than a plane parallel to the bottom of the lid and is eccentric from the center of gravity of the lid. Molten metal vessel lids.

According to the lid of the molten metal container of the present invention, the center of the suspension hole of the second suspension ring is located closer to the bottom than the plane passing through the center of gravity of the lid and parallel to the bottom of the lid. Since it is installed eccentrically from the center of gravity, the reversing work can be done by a small number of people without touching the lid.

1 shows a lid of a tundish (molten metal container) that is a first embodiment of the present invention, (a) is a top view, (b) is a sectional view along line AA of (a), and (c) is a front view. FIG. 2 is an explanatory diagram showing a method of reversing the lid shown in FIG. 1; Sectional drawing which shows the lid|cover of the tundish (molten-metal container) which is 2nd embodiment of this invention. 4 shows a second hanging ring provided on the lid shown in FIG. 3, (a) being an enlarged cross-sectional view along line BB of FIG. 3, and (b) being a view along line CC of (a). FIG. 4 is an explanatory diagram showing the lid of the tundish (molten metal container) that is the second embodiment of the present invention. 1 shows a conventional general tundish lid, (a) is a top view, (b) is a bottom view, (c) is a front view, and (d) is a sectional view taken along line AA of (a). FIG. 7 is an explanatory view showing a method of reversing the lid shown in FIG. 6;

<First Embodiment>
FIG. 1 shows a lid of a tundish (molten metal container) which is a first embodiment of the present invention.
This tundish lid 1 is the same as the conventional tundish lid 1 shown in FIG. The two second suspension rings 4 are provided by welding a rectangular metal plate having suspension holes 41 to the steel shell 11, as shown in FIGS. 1(b) and 1(c). The center of the hanging hole 41 of the second hanging ring 4 is positioned closer to the bottom surface 14 than a plane 6 passing through the center of gravity 5 of the lid and parallel to the bottom surface 14 of the lid (hereinafter referred to as "center of gravity plane") 6, And it is eccentric from the center of gravity 5 of the lid. Moreover, the line segment connecting the centers of the suspension holes 41 of the second suspension ring 4 at two locations does not intersect the straight line passing through the center of gravity 5 of the lid and perpendicular to the bottom surface 14 of the lid.
On the other hand, the center of the hanging hole 21 of the first hanging ring 2 is positioned closer to the upper surface 13 than the center of gravity plane 6 and is eccentric from the center of gravity 5 of the lid.
Note that the center of gravity 5 of the lid actually exists as a point inside the lid 1 . Also, in this tundish lid 1, the bottom surface 14 and the top surface 13 are parallel.

Next, a method for inverting the lid 1 of this tundish will be described with reference to FIG.
As shown in FIGS. 2(a) and 2(b), when the hook 31 is hooked to the hanging hole 41 of the second hanging ring 4 and the lid 1 is lifted up by the crane 3, the lid 1 is lifted as shown in FIG. 2(c). The lid 1 is separated from the floor and the bottom surface 14 is up. In this state, when the lid 1 is lowered onto the floor, the bottom surface 14 faces upward as shown in FIG. 2(d), and the lid 1 is turned over. At this time, manual assistance is not required, and only one operator of the crane 3 can safely and efficiently perform the work.

Thus, in this embodiment, the center of the suspension hole 41 of the second suspension ring 4 is located closer to the bottom surface 14 than the center of gravity plane 6 and is eccentric from the center of gravity 5 of the lid. 4 is used to lift the lid 1, the lid 1 is in a slanted state so that the bottom surface 14 faces upward. The longer the distance between the center of the suspension hole 41 of the second suspension ring 4 and the center-of-gravity plane 6, the greater the inclination when the lid 1 is lifted and the easier it is to turn over.

<Second embodiment>
FIG. 3 shows a lid of a tundish (molten metal container) according to a second embodiment of the present invention. 3 corresponds to the AA section of FIG. 1(a).

In this second embodiment, in the conventional tundish lid 1 shown in FIG. A second hanging ring 7 is detachably provided.

The second suspension ring 7 in the second embodiment consists of a suspension ring main body 71 and a pressing plate 72 as shown in FIGS. 4(a) and 4(b).
The suspension ring portion main body 71 has a detachable portion 712 and a suspension ring portion 713 . The detachable portion 712 has a U-shaped horizontal cross section and covers three surfaces of the first suspension ring 2 . Also, the detachable portion 712 has a bolt hole 714 . Further, a hanging ring portion 713 extends from the attaching/detaching portion 712 , and a hanging hole 715 is provided in the hanging ring portion 713 .
The bolt hole 714 of the second suspension ring 7 is aligned with the suspension hole 21 of the first suspension ring 2, and the bolt 73 is passed through the second suspension ring 7. The bolt 73 is fixed by tightening the pressing plate 72 with the nut 74. Thus, it is detachably provided in the suspension hole 21 of the first suspension ring 2 .
The center of the suspension hole 715 of the second suspension ring 7 is located closer to the bottom surface 14 than the gravity center plane 6 and is eccentric from the gravity center 5 of the lid, as in the first embodiment. Moreover, the line segment connecting the centers of the suspension holes 41 of the second suspension ring 4 at two locations does not intersect the straight line passing through the center of gravity 5 of the lid and perpendicular to the bottom surface 14 of the lid.

In this way, by attaching the second suspension ring 7 so as to surround the three surfaces of the first suspension ring 2, it is possible to prevent the second suspension ring 7 from being displaced when the lid is lifted. The force applied to the first suspension ring 2 can be dispersed. Further, the suspension ring main body 71 (detachable portion 712) and the pressing plate 72 sandwich the surface around the suspension hole 21 of the first suspension ring 2 and tighten it with the bolt 73 to prevent displacement.

By making the second hanging ring detachable, the second hanging ring can be attached only when the lid is turned over, and can be removed while the lid is in use. does not become an obstacle as a protrusion, and can be easily attached to the existing lid suspension ring (first suspension ring).

<Third Embodiment>
FIG. 5 shows a lid of a tundish (molten metal container) according to a third embodiment of the present invention.
In this third embodiment, in the conventional tundish lid 1 shown in FIG. A suspension ring 7 is detachably provided.
The configuration of the second suspension ring 7 is the same as that of the second embodiment shown in FIG.

In this third embodiment, as shown in FIG. 5, hooks 31 are hooked to hanging holes 715 (see FIG. 4) of two second hanging rings 7 provided on one of the long sides of the lid 1. is reversed, but compared to the case where the second hanging rings are provided on the two long side surfaces facing each other as in the first and second embodiments, the height for lifting the lid when reversing can be reduced. Therefore, the lid can be turned over in a narrow space, and work safety is improved.
In this third embodiment, a chain 32 whose length is adjustable is used so that when the lid is lifted as shown in FIG. are doing.

In the above embodiment, a hook of a crane or the like is directly hung on the hanging hole of the second hanging ring, but the hook may be attached via an auxiliary tool such as a shackle.
Also, in the above embodiment, the second suspension rings are provided at two locations, but they may be provided at only one location, or at three or more locations. However, in order to smoothly and safely turn over the lid, it is preferable to provide at least two second suspension rings.
Moreover, the first suspension ring does not necessarily have to be provided at four locations, and may be provided at only one location. However, in order to smoothly and safely hoist the lid with a crane when attaching or detaching the lid, it is preferable to provide at least three first suspension rings, and in the case of a square lid, it is more preferable to provide the first suspension rings at four locations.

If it is difficult to find the position of the center of gravity of the lid, for example, a member corresponding to the second hanging ring can be temporarily attached and lifted by a crane so that the lid can be positioned while checking the inclination. At this time, if the second hanging ring is detachable as in the second and third embodiments, positioning can be easily performed.

1 tundish (molten metal container) lid 11 iron shell 12 monolithic refractory 13 top surface 14 bottom surface 2 first suspension ring 21 suspension hole 3 crane 31 hook 32 length-adjustable chain 4 second suspension ring 41 suspension Hole 5 Lid Center of Gravity 6 Gravity Center 7 Second Suspension Ring 71 Suspension Ring Body Part 712 Detachable Part 713 Suspension Ring Part 714 Bolt Hole 715 Suspension Hole 72 Holding Plate 73 Bolt 74 Nut

Claims (2)

A molten metal container lid provided with a first suspension ring and a second suspension ring,
The first suspension ring is provided such that the center of the suspension hole passes through the center of gravity of the lid and is located on the upper surface side of a plane parallel to the bottom surface of the lid and is eccentric from the center of gravity of the lid,
The second hanging ring is provided at least two places so that the center of the hanging hole passes through the center of gravity of the lid and is positioned closer to the bottom than a plane parallel to the bottom of the lid and is eccentric from the center of gravity of the lid. Molten metal vessel lids. 2. The lid for a molten metal container according to claim 1, wherein the second suspension ring is detachably provided in the suspension hole of the first suspension ring.

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