JPS6126349Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a torpedo car heat retention cap.

High-temperature hot metal produced in a blast furnace is generally transported by torpedo car to a planned treatment plant such as a steel mill, and after discharging the hot metal into a refining vessel or other container, the car is returned empty to the blast furnace factory. It will be injected and loaded with hot metal again and will be operated to the planned hot metal processing plant.

In transporting such hot metal, empty cars and empty cars are repeated for the high-temperature molten metal. Therefore, the refractory lining layer on the inner surface of the torpedo car is alternately exposed to a high temperature state when the car is empty, and a drop in heat radiation temperature when the car is empty. Such repeated high-heat conditions and temperature drops in the refractory lining layer subject the lining refractory to extremely severe thermal conditions, causing wear and tear and significantly shortening the life of the lining layer.

The temperature drop in the refractory lining layer of the Torpedo car mentioned above, that is, the heat radiation, is caused not only by the heat radiation from the car body shell, but also by the heat radiation from the hot metal injection and discharge port (hereinafter simply referred to as the pig iron receiving port) provided at the top of the car body. Significant. For this reason, various devices have been proposed to prevent heat radiation from the pigtail hole.
It is published in Publication No. 14359 or Publication of Japanese Utility Model Application No. 34850/1983. However, all of these heat radiation prevention devices for the torpedo car pigtail hole are in the form of a heat retaining lid that is held on an opening/closing device or a slide device provided on the car body, and are provided with a durable lid that can be used repeatedly. Therefore, in the case of these known heat-retaining lid devices, equipment with a complicated structure is installed around the outer periphery of the vehicle body, or there is a risk of metal adhesion to the top surface of the pig iron receiving port due to molten metal scattering such as splashes. This caused problems such as the movement of the heat insulating lid being obstructed and the lid being unable to be installed reliably.

The purpose of the present invention is to provide an extremely easy-to-use heat retaining cap that solves the above-mentioned problems.

This invention receives pig iron from above while it is suspended in the torpedo car receiving hole, and the hot metal is softened by the heat of the hot metal.
This is a consumable heat-retaining cap designed to be melted, dropped by the hot metal flow, and mixed into the hot metal.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Figure 1 is a perspective view of the heat retention cap according to the present invention.
2 and 3 show a plan view and a side view, respectively. Moreover, FIG. 4 shows the state in which it is attached to a torpedo car. In the figure, reference numeral 1 denotes a heat insulating cap main body formed in a conical shape, and two heat insulating cap parts 2 and 3 each formed into a half-split conical shape are made of two thin steel plates that are soft and meltable by the heat of hot metal. The opposite sides are overlapped and bonded and fixed. In the present invention, the shape of the conical bottom portion 4 of the heat retaining cap body 1 is not particularly limited, and is preferably circular or oval, or the same shape as the pigtail hole of the torpedo car.

Additionally, if the periphery of the bottom of the heat insulating cap body becomes larger outward from the inner edge of the pig iron receiving hole, it will become difficult for the heat insulating cover to soften and melt due to the heat of the injected hot metal, and it will become difficult to fall down after the hot metal injection is completed. In this case, the bottom part of the heat retaining cap body remains on the edge of the pigtail hole, which requires a lot of effort in post-processing such as removal. Therefore, the size of the bottom portion 4 of the heat retaining cap body 1 should be made approximately equal to or slightly smaller than the inner edge of the pig iron receiving port to facilitate falling due to the heat of the injected hot metal.
If the heat retaining cap body 1 is too small, the gap between it and the inner edge of the pigtail hole will become large, increasing heat radiation. Reference numeral 5 denotes an overlapping margin for joining the heat retaining cap segments 2 and 3, and is formed in a shape that widens toward the end so that the overlapping margin 5 gradually increases from the top 6 of the heat retaining cap main body 1 toward the bottom.

There is no particular limitation on the means for forming the overlapped margin that widens toward the end at the joint of the heat-retaining cap segments 2 and 3, but the opposite side of the conical cap original thin plate is formed in a V-shape from the center toward the outer side. Before cutting or joining the directly cut original plates, each original plate is formed into a half cone shape, so that the opposing sides of each joint are formed in a V shape. It is possible to obtain an overlap margin that widens from the center toward the outer sides.

In the present invention, the above-mentioned overlap margin at the joint part is necessary to maintain the shape of the heat retention cap body, and it is sufficient as long as the shape can be maintained until the hot metal is poured. Since it will be difficult to fall due to the injection flow, an appropriate size should be selected. In addition, in the present invention, the overlapping margin 5 is shaped to widen from the top 6 to the bottom 4 of the thermal cap main body 1, so that
The heat retaining cap body can be efficiently constricted by hot metal heat and hot metal flow pressure during pig iron receiving, making it easy to fall. Therefore, in the present invention, the degree of divergence of the overlapping margin of the joint portion should be appropriately selected within the scope of the purpose of the present invention. In addition, when joining the half-conical heat retention cap sides 2 and 3, a notch 7 is provided at the center of the joining side in a direction perpendicular to, for example, a direction perpendicular to the joining side, and the notches are interlocked with each other to join. By doing so, it is possible to stably and accurately join both the joining pieces.

The means for joining the above-mentioned joints may be such that they do not separate during use, and may be welded, pinned, wired, etc., but spot welding or the like is more efficient due to the nature of the present invention. Reference numeral 8 denotes a reinforcing rod extending along the inner surface of the heat retaining cap body 1 around the top 6, and in this embodiment, a steel bar bent along the inner surface shape of the heat retaining cap body 1 is welded or otherwise processed. Fixed by means.

The reinforcing rod 8 is fixed to the surface of the heat retaining cap body 1 in a direction perpendicular to the overlap 5 direction of the joint, with the top 6 of the heat retaining cap body 1 as the center, thereby providing reinforcement in the fixing direction and shifting the center of gravity of the heat retaining cap body 1 toward the top 6, thereby obtaining stable installation of the heat retaining cap body 1 in the usage form as shown in Figure 4.

The reinforcing rods 8 are not limited to the inner surface of the heat retaining cap main body as described above, but can also be installed on the outer surface. Further, in the present invention, the reinforcing rod 8 can be replaced with a steel bar and may be of a ribbon-like steel plate type or a ribbon steel plate made in a shape that widens from the center toward both ends. In place of the outer reinforcing rod 8, a plate-shaped or flat reinforcing plate having a relatively small area may be used for the purpose of controlling early melting of the vicinity of the top 6 of the heat-retaining cap body 1. In the present invention, it goes without saying that the reinforcing rod 8 includes the reinforcing plate described above.

Reference numeral 9 denotes a suspension rod for suspending the heat insulating cap body 1 from the pigtail hole, but this suspension rod 9 is not limited to this illustrated example, and may be a handle-shaped suspension fitting or a hook-shaped fitting. Furthermore, it is also possible to integrally form a suspension hook by extending a portion of the opposite end of the heat insulating cap body.

Although the present invention is constructed as described above, its usage will be further described below.

Torpedo car 10 receives high-temperature hot metal from the blast furnace and transports the hot metal to a steelmaking factory, where it is made into steel.
Discharge into a furnace, etc. As illustrated in FIG. 4, at the receiving port 11 of the torpedo car 10 after discharging the hot metal,
By suspending the suspension rod 9 over the upper edge 12 of the pigtail socket 11, the heat insulating cap body 1 is suspended with its top 6 facing down, covering the pigtail socket 11 in a funnel shape. In this way, the heat accumulated inside the torpedo car 10 is prevented from being radiated from the pigtail receiving port 11. Furthermore, when the torpedo car 10 is moved to the blast furnace factory again, the cross-shaped joints and reinforcing rods prevent the cap from deforming, even though the forming plate of the heat insulating cap body is thin and lightweight. Furthermore, in combination with the effect of shifting the center of gravity of the reinforcing rod 8, stable mounting can be achieved.

Furthermore, when receiving pig iron with the heat retaining cap body 1 attached at a blast furnace factory, a small amount of high-temperature hot metal may temporarily remain in the heat retaining cap body 1 attached in a funnel shape at the start of pig iron receiving. As a result, the forming plate of the heat retention cap body is softened, and the base portion 4 of the heat retention cap body is easily narrowed due to the weight of the retained hot metal due to the joining overlap 5 formed in a shape that spreads toward the end, and the pig iron opening 11 of the retained hot metal is easily narrowed. In addition to preventing leakage to the outside, by softening the suspension rod 9, the suspended rod 9 finally falls together with the hot metal flow, making subsequent pig iron receiving easier.

As described above, the heat retaining cap of the present invention has a simple structure and is easy to manufacture, and can be installed stably and easily regardless of the presence or absence of deposits on the top surface of the pigtail hole. It is possible to maintain a stable mounting state without being affected by wind pressure etc. even while driving. Further, the heat retaining cap that remains attached during pig iron receiving can be easily dropped into the torpedo car at the early stage of pig iron receiving due to the high heat of the hot metal, the pressure under the hot metal flow, and the weight of the hot metal.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the thermal insulation cap of the present invention, Figure 2
The figure is a plan view of the same, FIG. 3 is a side view of the same, and FIG. 4 is a diagram showing a state of attachment to a torpedo car. 1... Heat retention cap body, 2, 3... Heat retention cap pieces, 5... Joining overlap allowance, 8... Reinforcement rod. 〓〓〓〓

Claims (1)

[Scope of utility model registration request] A conical cap is formed by joining two thin steel plates, each formed into a half-split conical shape, with their joint sides overlapped.
The torpedo car is characterized in that the overlap margin is made into a shape that gradually increases from the top to the bottom of the conical shape, and further, a reinforcing rod is fixed along the surface of the conical shape orthogonally to the overlap joint. Thermal cap.