JPH062023A - Slag stopper for torpedo ladle car - Google Patents

Abstract

PURPOSE:To reduce flow-out quantity of slag from a torpedo ladle car to a molten iron ladle by holding one end of a supporting arm to a horizontal rod so as to be rotatable and absorbing the variation of molten metal surface height in the torpedo ladle car. CONSTITUTION:A gantry frame 8 is arranged as parallel with the travelling direction of the torpedo ladle car 6. The horizontal rod 16 is fitted to posts 10 at both sides of the gantry frame 8 so as to be liftable and rotatable. One end of the supporting arm 22 is fitted to the central part of the horizontal rod 16 so as to be rotatable. A refractory-made slag stopper body 24 is fitted to the tip part of the supporting arm 22. Then, by holding the one end of the supporting arm 22 to the horizontal rod 16 so as to be rotatable, the variation of the molten metal surface height in the torpedo ladle car 6 is absorbed. The gantry frame is suspended on rail arranged at the upper part through a travelling device. By this method, the efficiency of discharging operation for molten iron can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag stopper for a mixed pig car, and more particularly to a slag stopper which is not attached to the mixed pig car and is provided in a raw material yard of a steelmaking plant and prevents slag from flowing out when the molten pig metal is discharged. .

2. Description of the Related Art A mixed pig metal containing hot metal from a blast furnace is mixed with a small amount of blast furnace slag at the time of receiving hot metal, and recently, a pretreatment such as desiliconization, dephosphorization, and desulfurization is performed during transportation to a steelmaking plant. Therefore, the pretreatment agent is slag. Therefore, when tapping hot metal from a hot metal car to a hot metal ladle in a steelmaking plant, the slag floating on the hot metal surface inside the hot metal car may flow out to the hot metal ladle.
There is a risk of re-phosphorization and re-sulfurization, so it must be minimized. Even in a hot metal truck, the residual dephosphorization and desulfurization slag interferes with the subsequent pretreatment, so that the residual slag is completely discharged after the hot metal is discharged. However, when the slag is discharged with the tilting angle of the hot metal car being fully tilted, a small amount of hot metal remains, and in the past, it was attempted to scrape out the slag after discharging it completely into the hot metal ladle. In addition to high heat work, there was a drawback that the hot metal yield was lowered.

In order to eliminate such drawbacks, many techniques have been disclosed for preventing slag from being mixed in when hot metal is discharged from a conventional hot metal wheel. The outline of the conventional technique will be described below. JP-A-56-93807: The gist of the present invention is as follows. That is, "a slug stopper for a towed vehicle, which includes a stopper support member that can be attached to and detached from a position where the hole of the towed vehicle is straddled, and a stopper with a handle that is rotatably mounted around the mounting position of the stopper support member." Is. This invention adopts a system in which a rod-shaped slag stopper is inserted into the inside of the towed pig wheel, rotated by 90 degrees, and hooked on the towhole of the towed piggy car. However, this invention cannot rotate the rod-shaped slag stopper 90 degrees inside the tow truck when the level of the molten metal is high, or when a large amount of solid slag or metal is attached around the taphole, Therefore, there is a problem that it requires a lot of time and labor for mounting.

JP-A-62-146208: The gist of the present invention is as follows. That is, “a gas injection nozzle is provided in a gas header that is rotatably supported by a support base that is detachably installed in a state of straddling the hot metal outlet on the hot metal car and that is connected to a pressure gas supply source. At the same time, a balance weight for maintaining a constant gas injection angle of the nozzle is provided on the gas header. This invention
A gas header is rotatably attached to a support table that is provided in a state of straddling the hot metal outlet, and a method is adopted in which gas is injected to push the slag floating on the hot metal toward the back. However, this invention has a problem that the slag is scattered by the gas injection and that the surface of the hot metal is easily cooled and oxidized.

JP-A-63-219515: The gist of the present invention is as follows. That is, "a slug / stopper is composed of a frame that straddles the upper portion of the furnace mouth or pot of a torch car, and a stopper body suspended on the lower surface of this frame, and the substantially C-shaped hook of the frame is used as a furnace. Attach the frame to the torpedo wheel or pot by dropping it into a pin bracket provided on the mouth or the outer periphery of the pot, and project the stopper body into the furnace mouth or pot, and the stopper body is the toorwheel or pot. A furnace port lid type slag stopper device in which support pins at both ends of the main body that are parallel to the tilt center of the main body are freely engaged with V-shaped guide holes on the frame side. As is clear from the above-mentioned gist, the present invention adopts a method of attaching the slide-type outflow prevention plate to the receiving port. However, the slide plate and the mounting plate are large, and the attachment and detachment of these are large, which requires time and labor for mounting, and there is a drawback that if the slag adheres to the slide plate, it is difficult to remove.

Japanese Patent Application Laid-Open No. 54-99706: The present invention is an invention of "application method and apparatus for hot metal from mixed pig iron" according to the applicant's application, and the summary thereof is as follows. That is, "1. When tapping hot metal from a hot metal car, the spout part of the hot metal car is covered with a blocking plate from the outside in the process of tapping the hot metal slag outflow passage of the spout, while A method for discharging hot metal, etc. from a hot metal car, characterized in that only hot metal is allowed to flow out from the hole 2. A support frame is provided on the hood carriage that is located on the hot metal pot when the hot metal is discharged from the hot metal car, and the support frame is provided on the support frame. A mounting rod, to which a blocking plate for preventing the outflow of molten slag from the towing car was fixed, was swingably mounted, and the free end of the cylinder for swinging was engaged with the rear end of the mounting rod. Discharge device for molten pig iron, etc. As is apparent from the above-mentioned gist, the present invention is a system in which the perforated plate is pressed into the receiving hole and the slag is pressed backward. However, in the present invention, hydraulic equipment such as a hydraulic cylinder is directly subjected to radiant heat of hot metal, which may cause malfunction due to high heat. There is a problem that it is difficult for the up and down movement of the arm that supports the base to follow the fluctuation of the molten metal surface.

[0006] Actual Kaihei 2-87053: The gist of this invention is as follows. That is, "a slag lid for a mixed pig car piggyhole, wherein a slag lid for separating and removing the slag of molten pig iron is provided in the pig iron mouth of the piggy car." This device has a structure in which a lid made of a refractory material with holes formed in the top and bottom is attached to the piggyhole, and only the hot metal is allowed to flow out from the lower opening, but it takes time to remove the lid and the mounting bolt An operator must approach the hot iron receiving port for removal, and if slag adheres to the inside of the lid, it must be completely removed for reuse, but this problem is difficult. is there.

JP-A-2-197512: The gist of the present invention is as follows. That is, "1. A mixed pig iron car with a detachable weir for slag cutting on the outer surface of the taphole. 2. When the weir comes into contact with the outer surface of the taphole, air is replaced at the top of the taphole. The mixed pig iron according to claim 1, wherein the void is formed in a shape that forms a void for hot metal discharge in the lower portion. " That is, according to the present invention, an opening / closing lid having an upper part and a lower part cut is attached to a taphole, and molten pig iron is allowed to flow out from a lower void,
It is a device that tries to confine the slag inside. However, also in the present invention, for example, during hot metal pretreatment, for example, when blowing a dephosphorizing agent, when the splash of hot metal occurs and adheres to the rotating part of the lid, etc., the lid cannot be opened and closed, and the hot metal due to splash and If the slag adheres to the tap hole, the lid will not be completely closed, and there is a problem that the hot metal flows out from the gap and scatters.

[0008]

DISCLOSURE OF THE INVENTION Problems to be solved by the prior art of the slag stopper in the above-mentioned towed piggy car have been studied, and the following conclusions have been obtained. (B) As a device for preventing the outflow of slag from the mixed pig iron, it is inappropriate to additionally install it in the vicinity of the receiving pig iron port of the mixed pig iron. The reason for this is that since pre-treatment such as dephosphorization and desulfurization is performed on the mixed pig iron, it is easy for deposits of metal and slag to be generated at the pig iron port due to splash of molten pig iron, etc. Difficult to do. (B) Therefore, the slag outflow prevention device should be installed independently in the raw material yard of the steelmaking plant that discharges it to the hot metal ladle.
Since the environment is high temperature and dust generation, it is necessary to simplify the structure and minimize the functions. (C) Since the molten metal level changes each time due to tilting of the hot metal wheel, it is difficult to make the slag stopper follow the molten metal fluctuation accurately.

[0009]

The problems of the prior art of the above-mentioned slag stopper for a towed pig car can be solved by the present invention having the following gist. (1) In the slag stopper for a mixed pig car that prevents the outflow of slag when the molten pig iron is discharged from the mixed pig car, a gate-shaped frame that is arranged parallel to the traveling direction of the mixed pig car and the posts on both sides of the gate-shaped frame are lifted and lowered. And a rotatably attached horizontal rod, a support arm having one end rotatably attached to the center of the horizontal rod, and a refractory slug stopper body attached to the tip of the support arm. A slag stopper for a tow truck, wherein one end of the support arm is rotatably held by a horizontal rod to absorb a change in height of a molten metal surface in the tow truck. (2) The gate-shaped frame is the slug stopper for a towed vehicle according to the above (1), which is suspended via a traveling device from a rail that is supported and provided in parallel with the traveling direction of the towed vehicle. .

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view showing the relationship between the mixed piggy car in the hot metal pit and the slag stopper of the present invention. FIG. 2 is a schematic cross-sectional view showing the slag stopper at the start of hot metal dispensing. First, the structure of the slug stopper 2 of the present invention will be described. A gate-shaped frame 8 is installed in a position across the hot metal pit 4 in parallel with the traveling direction of the mixed piggy car 6. A horizontal rod 16 is provided on each of the posts 10 on both sides of the gate frame 8 so as to be able to move up and down and rotate via an elevating device 12 and a rotating device 14.
Is provided. A support arm 22 is rotatably attached to the center of the horizontal rod 16 via a lever 18 and a pin 20.
Is attached, and a slug stopper body 24 is provided at the tip of the support arm 22.

The slag stopper body 24 is made of a refractory material, has a specific gravity intermediate between that of the slag and the hot metal, and is free from corrosion by the slag and melting loss by the hot metal. 1 and 2 show an embodiment in which the gate frame 8 is installed on the floor, while FIGS. 3 and 4 show an embodiment in which it is suspended on the rail 26. That is, a rail 26 supported from above is provided in parallel with the traveling direction of the towed piggy car 6, and the gate-shaped frame 8 is suspended on the rail 26 via a traveling device 28, and the lower end of the post 10 of the gate-shaped frame 8 is suspended. The horizontal swing stop 30 provided on the floor can prevent shaking.

[0012]

When the torpedo car 6 enters the raw material yard and stops in the hot metal pit 4, the horizontal rod 16 is lowered by the elevating device 12, and the slag stopper body 24 is appropriately rotated by the rotating device 14 to move the slag stopper main body 24 into the tow car 6 Insert into the opening 32.
As the torch car 6 is tilted, the slag stopper body 24
Is immersed in the slag 34 and floats on the hot metal 36. When the tilting of the hot metal wheel 6 is further increased, the hot metal 36 becomes hot metal ladle 3.
8, the slag 34 almost never flows out because the slag stopper main body 24 serves as a weir to close the opening 32. If the tilting of the hot metal wheel 6 continues, the molten metal level of the hot metal 36 also decreases as shown by the dotted line in FIG. 2 or FIG. 4, but in the present invention, the horizontal rod 16 is lowered by the lifting device 12 and one end of the support arm 22 is lowered. Is rotatably attached to the lever 18 of the horizontal rod 16 via the pin 20, so that the slag stopper body 24 is always floating on the hot metal 36.

Therefore, a change in the level of the molten metal can be easily followed by raising and lowering the horizontal rod 16. Even if the elevation of the horizontal rod 16 is delayed a little, the slug stopper body 24 only rotates about the pin 20, so that the position inside the towing car 6 is only slightly displaced. Even after the molten pig iron 36 has been discharged, the slag 34 can be prevented from flowing out because the inclination of the support arm 22 approaches horizontal and the horizontal distance extends, as shown by the dotted line in FIG. 2 or 4. Further, by rotating the horizontal rod 16 by 180 degrees using the rotating device 14 with respect to the adjoining mixed piggy wheel 6 as well, the slag stopper body 24 is inserted into the mixed piggy car 6 in the same procedure to prevent the slag from flowing out. Can be planned. In the mobile embodiment shown in FIGS. 3 and 4, rail 26 and travel device 28 are shown.
By this action, the entire slag stopper 2 can be easily pulled out and moved from the hot metal pit 4, so that parts replacement work and maintenance work can be performed safely.

[0014]

In view of the problems of the conventional device, the slag stopper for a mixed pig car according to the present invention is provided independently in the raw material yard of a steelmaking factory, for example, without being additionally provided in the vicinity of the mixed pig car receiving port. In addition, the structure is simplified so that the slag stopper main body 24 only needs to move up and down the horizontal rod 16 so that the slag stopper body 24 can be used even in a high temperature and dusty atmosphere.
Since it is configured to move following the tilting associated with the payout of 6,
The drawbacks of the conventional device were eliminated and the following great effects could be obtained. (A) Since the action of the slag stopper according to the present invention is extremely effective, the amount of slag flowing from the mixing pig wheel to the hot metal ladle can be reduced to 10 to 20% of the conventional amount. (B) By turning the entire horizontal rod 180 degrees, it is possible to successively carry out the hot metal discharge of two adjacent hot metal cars, and the efficiency of the hot metal discharge work has been dramatically improved. (C) Since (a) eliminates the need to remove slag from the hot metal ladle,
It was possible to improve the hot metal yield while reducing the load on the operator. (D) Since the slag removal work is unnecessary and the hot metal payout time is shortened, the temperature drop of the hot metal is reduced by 2 to 5 ° C. (E) Since the amount of slag spilled from the hot metal truck has been significantly reduced,
The melting loss of the slag line refractory in the hot metal ladle was reduced, and the basic unit of refractory could be reduced by 2 to 5%. (F) Since no dust was generated when slag was removed from the conventional hot metal ladle, the working environment was improved and the dust collection function had a margin. (G) Since there is no re-phosphorization and re-sulfurization due to slag slag outflow, it was possible to reduce the unit consumption of auxiliary raw materials in the converter. (H) Since the amount of outflow slag is extremely small, the weight of the hot metal charged into the converter can be accurately grasped, which makes it possible to improve the accuracy of the initial value of the converter blowing process, and as a result, the basic unit of auxiliary raw materials can be reduced. It was (I) The slag stopper according to the present invention has a simple structure, but its action and effect are extremely large. Since the slag stopper acts by following the tilting movement of the tow truck only by the vertical movement of the horizontal rod, the load on the operator is small and the number of personnel increases. No need of.

[Brief description of drawings]

FIG. 1 is a front view showing a relationship between a hot metal wheel in a hot metal pit and a slag stopper of the present invention.

FIG. 2 is a schematic cross-sectional view showing the slag stopper of the present invention at the start of hot metal dispensing.

FIG. 3 is a front view showing a relationship between a hot metal wheel in a hot metal pit and a slag stopper according to another embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view showing a slag stopper according to another embodiment of the present invention at the start of hot metal dispensing.

[Explanation of symbols]

 2 Slug stopper (whole) 4 Pit 6 Torch car 8 Gate type frame 10 Post 12 Lifting device 14 Rotating device 16 Horizontal rod 18 Lever 20 pin 22 Support arm 24 Slug stopper main body 26 Rail 28 Traveling device 30 Horizontal swinging 32 Opening 34 Slag 36 Hot metal 38 Hot metal pan

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Okamoto 1-chome, Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (no address) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (72) Inventor Shigeru Omiya Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture Chome (No house number) Kawasaki Steel Co., Ltd. Mizushima Steel Works

Claims (2)

[Claims] 1. A slag stopper for a mixed pig car that prevents slag from flowing out when the molten pig metal is discharged, and a gate-shaped frame arranged parallel to the traveling direction of the mixed pig car,
A horizontal rod rotatably and vertically mounted on posts on both sides of the gate frame, a support arm rotatably attached at one end to a central portion of the horizontal rod, and a fireproof device attached to a tip of the support arm. A slag stopper body made of a product, wherein one end of the support arm is rotatably held by a horizontal rod to absorb fluctuations in the height of the molten metal in the mixed piggy car. Slag stopper. 2. The slug stopper for a towed vehicle according to claim 1, wherein the gate-shaped frame is suspended via a traveling device on a rail provided in parallel with the traveling direction of the towed vehicle and supported from above.