JP3469035B2 - Insulation lid for molten metal pot - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a heat insulating lid for a molten metal ladle (hereinafter simply referred to as a heat insulating lid).

[0002]

2. Description of the Related Art Molten steel as molten metal contained in a molten metal pan (hereinafter simply referred to as a ladle) or a ladle to prevent heat radiation from a refractory lining and to maintain a good working environment. Putting a heat-retaining lid on the upper end of the ladle is the actual opening.
No. 158354, the entire lower surface of the heat insulating lid is usually castable and lined.

[0003]

However, in a ladle containing molten steel of about 350 tons, the diameter of the heat-insulating lid is 4 to 5 m, and if the entire lower surface of the heat-insulating lid is lined with castables, the heat-insulating lid will be The weight becomes very heavy, and a large load is applied to the crane for hoisting and carrying the ladle, which is not preferable. In order to reduce this weight, it is assumed that the castable material is replaced with a lightweight chemical fiber-based refractory material such as glass fiber, asbestos and slag fiber. However, when the converter slag and the metal remaining in the ladle are tilted and discharged as shown in FIG. 3, the converter slag being discharged and the lower end (the tip of the heat retaining lid with the metal open) ) Part, it is melted and damaged at an early stage, and there is a problem that it must be repaired frequently. INDUSTRIAL APPLICABILITY The present invention is lightweight, and even if the converter slag and the metal are in contact with each other, the life is not shortened, and
It is an object of the present invention to provide a heat retaining lid that does not deteriorate maintainability.

[0004]

Means for Solving the Problems The present invention has been made in order to solve the above-mentioned problems, and means 1 thereof has a rear portion rotatably provided at an upper one end of a ladle. In a heat retaining lid for retaining heat of a lined refractory or molten steel contained in the ladle, the back of the tip of the heat retaining lid is a brick or castable refractory, and the inner back is a fibrous refractory.
Further, the means 2 is provided with a gate-type support member on the upper surface of the heat-retaining lid, and when another heat-retaining lid is overlaid on the gate-type support member, the back surface portion of the heat-retaining lid that comes into contact with the gate-type support member < The heat-insulating lid according to the above-mentioned means 1, wherein B is a brick or castable refractory. The means 3 is provided with a guide member having an inclined surface that spreads downward from the upper part to the lower part on the stiffener above the trunnion of the ladle so that the inclined surface faces outward, and guides the inclined surface of the guide member. Has been
The means 1 or 2 in which the heat-retaining lid is provided with a foot for self-standing capable of standing on the stiffener. Also, means 4
Is one of means 1 to 3 in which the diameter of the heat retaining lid is smaller than the inner diameter of the ladle.

In the present invention, as in the case of the above-mentioned means 1, while the tip of the back surface of the heat retaining lid, that is, the ladle is tilted to discharge the converter slag and the metal in the ladle, the converter The slag, the part that comes into contact with the metal is made of brick or castable refractory with good erosion resistance to prevent erosion of the refractory, and the other parts are made of fiber refractory to reduce weight. is there. As the brick, a refractory brick of high alumina type, magnesia type, magnesia-carbon type , alumina-carbon type or the like can be used, and as castable, high alumina type, alumina-magnesia type or chamotte type can be used. Further, as the fiber of the fiber type, an alumina-silica type, an alumina-silica-zirconia type, or a silica type can be used.

Further, like the means 2, when a gate-shaped support member is provided on the upper surface of the heat-insulating lid and another heat-insulating lid is overlaid on the gate-shaped support member, the gate-shaped support member comes into contact with the heat-insulating lid. By using brick or castable refractory for the back side of the upper heat-insulating lid, the refractory will not be deformed or damaged due to the weight of the upper heat-insulating lid that has become stronger and piled up, and frequent repairs will be performed. It is not necessary and is preferable.

Further, like the means 3, on the stiffener which surrounds the upper outer periphery of the ladle in a ring shape so that the inclined surface faces outward, a guide member having an inclined surface spreading downward from the upper portion to the lower portion is provided. In addition, by providing the upper part of the trunnion of the ladle, guided by the inclined surface of this guide member, by providing the heat-retaining lid with a self-standing foot that can stand on the stiffener, the heat-retaining lid is provided in the trunnion side direction of the ladle. It can always be placed in place on the ladle without slipping. Further, the heat-retaining lid can be placed horizontally by making the self-supporting foot stand on the stiffener, and when the heat-retaining lid is automatically attached / detached, the attaching / detaching device does not become complicated, which is preferable.

Like the means 4, by making the diameter of the heat retaining lid smaller than the inner diameter of the ladle, the heat retaining lid can be inserted into the ladle, and the gap between the ladle and the heat retaining lid is narrowed. It is possible to improve the heat retention effect.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS.
Will be described with reference to. 1 is a perspective view showing a state in which the heat retaining lid of the present invention is placed on a ladle , FIG. 2 is a plan view showing the back of the heat retaining lid of the present invention , and FIG. FIG. 4 is a side view showing a state where slag and metal are discharged , FIG. 4 is a perspective view showing a state in which heat insulating lids are piled up, and FIG. 5 is a side sectional view taken along the line AA in FIG.

In FIGS. 1 and 2, reference numeral 1 is a heat-retaining lid that covers the upper end of the ladle 2. The heat-retaining lid 1 has a circular inverted concave frame 1a having an upper surface and a side peripheral surface made of an iron plate, two frames 1c fixed to the upper surface of the frame 1a, and provided at both ends of each frame 1c. In addition, a foot 1b for self-standing having a lower end obliquely cut by 30 ° or more with respect to the horizontal, a lid hanging piece 1d provided on the upper surface of each frame 1c, and this lid hanging piece 1d.
Two gate-shaped support members 1f provided between the frames 1c at the outer side position, a turning hook 1e provided on the rear portion (right side in FIG. 1) of the frame 1a, and a recess of the frame 1a It is composed of 1 g of refractory material.

The refractory 1g is made of chamotte castables 1ga and 1gc on the lower surface (upper side in FIG. 2) and lower surface (left and right side in FIG. 2) of the frame 1a, and chemicals applied inside. Since 1 gb of the fiber-based alumina-silica fiber is stretched, the weight can be reduced by about 50% compared to the case where the entire surface is castable. Further, the heat retaining lid 1 is smaller than the diameter of the upper end opening of the ladle 2 by about 20 mm to 40 mm.

Reference numeral 4 is a guide member having a slanting cutting surface 4a extending downward from the upper part. The cutting surface 4a is located above the trunnion 6 of the ladle 2 so that the cutting surface faces the outside (front side in FIG. 1). It is fixed on the stiffener 5. 7
Is a bracket which is provided on the stiffener 5 of the ladle 2 and is rotatably engaged with the turning hook 1e provided on the heat retaining lid 1. Reference numeral 8 is an eyelot used for discharging the converter slag / metal 12 remaining in the ladle 2, one end of which is engaged with the auxiliary winding hook 9 of the crane and the other end of which is rotated to the bottom of the ladle 2. It is movably installed.

[0013] The ladle 2 is finished receiving the molten steel from the converter (not shown) in a state that does not have me placing the heat insulation cover 1, cover hanging piece 1d warmth lid hanging crane hooks (both not shown) Then, the crane for hanging the heat-retaining lid adjusts the position of the heat-retaining lid 1 with the ladle 2 while lowering the hook.
The ladle is placed on the ladle 2 and conveyed to the next step. When the heat retaining lid 1 is placed on the ladle 2, the rotating hook 1e of the heat retaining lid 1 engages with the bracket 7 provided on the upper portion of the ladle 2, and the self-supporting foot 1b is cut by the cut surface 4a of the guide member 4. while being guided by that the placing on the stiffener 5, heat insulation cover 1
Can be always located at a predetermined place in the ladle 2 as shown in FIG.

When the molten steel in the ladle 2 has been supplied to the continuous casting equipment, the trunnion 6 of the ladle 2 is hung by the hook 10 of the pot hanging crane (not shown). The auxiliary lapping hook of the crane is hung on the eyelot 8 and the auxiliary lapping hook 9 is wound up to tilt the ladle 2. As a result, the heat retaining lid 1 is gradually opened with the bracket 7 as a fulcrum, and the state shown in FIG. 3 is reached. The converter slag / metal 12 remaining in the ladle 2 is accompanied by the tilting of the ladle 2
It begins to be discharged from inside. At this time, if the discharged converter slag / metal 12 is scattered and hits the back end of the heat-retaining lid 1, or if there is a large amount of the converter slag / metal 12 remaining in the ladle 2, it is fully opened. There is a case where it contacts the back surface tip of the heat retention lid 1 which is not open, but since the castable 1ga is lined inside the back surface tip, the damage is slight.

Further, as shown in FIG. 4, when stacking and temporarily placing on the temporary placing table 11, the refractory lining on the lower surface of the upper heat retaining lid 1 in contact with the gate type support member 1f provided on the lower heat retaining lid 1 ( By making the castable 1gc (left and right in FIG. 2), the castable 1gc is not deformed or damaged by the weight of the upper heat retaining lid 1, and can be maintained in a normal state for a long time.

In the above embodiment, the refractory lining on the lower surface of the heat retaining lid is made of chamotte castable.
When using high alumina type, alumina-magnesia type castable, high alumina type, magnesia type,
The present invention is also applicable when a refractory brick such as magnesia-carbon type or alumina-carbon type is used. Furthermore,
Although the alumina-silica type fiber is used as the fiber type fiber, the present invention is also applicable to the case where the alumina-silica-zirconia type fiber is used.

[0017]

As described above, according to the present invention as set forth in claims 1 to 4, it is possible to reduce the weight of the heat retaining lid at low cost without deteriorating the life and maintainability,
It has become possible to minimize the adverse effects on the crane. In particular, the present invention according to claim 2 relates to a heat insulation lid.
Since the back side is made of refractory, the weight of the upper heat retaining lid allows the lower heat retaining lid to be stacked on top of it without being deformed or damaged, greatly reducing the temporary storage space for the heat retaining lid. It became possible to do it. Further, claim 3
According to the present invention described above, a guide member having an inclined surface that spreads downward from the upper portion to the lower portion is provided on the stiffener above the trunnion of the molten metal ladle so that the inclined surface faces outward, and the inclination of the guide member is increased. Guided by the surface, since the self-standing foot capable of standing on the stiffener is provided on the heat-insulating lid for the molten metal pan, it is possible to always set the ladle at a predetermined position without shifting the heat-insulating lid, For example, in the case where the heat retention cover is automatically hung and removed, it is possible to eliminate the failure of the heat retention cover attachment / detachment device without complicating the heat retention cover attaching / detaching device. In the present invention according to claim 4, since the diameter of the heat insulating lid is smaller than the inner diameter of the molten metal ladle, the heat insulating lid can be inserted into the ladle, and the gap between the ladle and the heat insulating lid can be narrowed. It is possible to improve the heat retention effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a heat retaining lid of the present invention is placed on a ladle.

FIG. 2 is a plan view showing a back surface of a heat retaining lid of an example of the present invention.

FIG. 3 is a side view showing a state in which a ladle equipped with a heat insulation lid according to the present invention is tilted to discharge a converter slag and metal.

FIG. 4 is a perspective view showing a state in which the heat insulating lids of the examples of the present invention are stacked and placed.

FIG. 5 is a side cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

1 Insulating Lid 1a Frame 1b Self-Standing Foot 1c Frame 1d Lid Hanging Piece 1e Rotating Hook 1f Gate Support Member 1g Refractory 1ga Castable 1gb Fiber 1gc Castable 2 Ladle 4 Guide Member 4a Cutting Surface 5 Stiffener 6 Trunnion 7 Bracket 8 Eyelot 9 Winding hook 10 Hook 11 Temporary stand 12 Converter slag
Bullion

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuyoshi Kashiwara 1 Nishinosu, Oita-shi, Oita Shin-Nippon Steel Co., Ltd. Oita Steel Works (72) Ryo Kojima 1 Nishinosu, Oita-shi, Oita Pref. Oita Steel Co., Ltd. (56) Reference JP-A-50-145326 (JP, A) JP-A-58-116976 (JP, A) Actual development 61-133536 (JP, U) Actual development Sho-56- 142864 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B22D 41/00 F27D 1/18

Claims (4)

(57) [Claims] 1. A heat retaining device for a molten metal pot, wherein a rear part is rotatably provided at one end of an upper portion of the molten metal pot to keep a temperature of a refractory lining of the molten metal pot or the molten metal contained in the molten metal pot. the closure, the front portion rear surface of the molten metal pot for insulation cap as refractory brick or castable, the molten metal pot for insulation lid inside back surface, characterized in that the refractory of the fiber system. 2. A gate-type support member is provided on the upper surface of the heat-insulating lid for the molten metal pan, and when another heat-insulating lid for the molten metal pan is stacked on the gate-type support member, the gate-type support member is brought into contact with the gate-type support member. The heat-insulating lid for a molten metal pot according to claim 1, wherein a back surface portion of the heat-insulating lid for the molten metal pot is made of brick or castable refractory. 3. A guide member having an inclined surface that spreads downward from the upper portion to the lower portion is provided on a stiffener above the trunnion of the molten metal ladle so that the inclined surface faces outward, and the inclined surface of the guide member. The heat-insulating lid for a molten metal pot according to claim 1 or 2, wherein the heat-insulating lid for the molten metal pot is provided with self-standing legs that can be erected on the stiffener. 4. The heat-insulating lid for a molten metal pan according to claim 1, wherein a diameter of the heat-insulating lid for the molten metal pan is smaller than an inner diameter of the melt-metal pot.