JPH0765094B2 - Vacuum degassing tank bullion recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a vacuum degassing apparatus for performing secondary refining of molten steel in a steelmaking plant, and in particular, two vacuum degassing tanks are provided and Alternately used for molten steel processing position,
At the standby position, the lower tank exchange cart is used to replace the lower tank, or the inside of the tank is heated.

<Prior Art> In a vacuum degassing apparatus, when the internal temperature of a vacuum degassing tank (hereinafter referred to as a degassing tank) is low during secondary refining of molten steel, it may be difficult to process the molten steel. However, it is necessary to heat the inside to keep heat even during the process interruption (hereinafter referred to as non-process time).

This heating is generally performed by burning a fuel gas with a burner arranged above the degassing tank to heat the gas.
(Japanese Patent Laid-Open No. 2-77517, etc.) And, in many cases, the combustion exhaust gas generated at this time is discharged from the immersion pipe at the lower part of the degassing tank and guided to the outside of the apparatus through the exhaust gas duct to be discharged.

Further, in the degassing tank, the molten steel being processed is scattered during the processing of the molten steel and adheres to the degassing tank to form a so-called ingot. This metal needs to be recovered because it melts and drops when the degassing tank is heated.

FIG. 6 shows an example of the bullion recovery device shown in the above-mentioned Japanese Patent Laid-Open No. 2-77517.

In the figure, the degassing tank A is heated by burning the fuel gas by the burner B at the time of non-treatment. Then, the combustion exhaust gas is discharged from the immersion pipe S into the bag E, and is further guided to the outside of the device by the duct D to be diffused. At this time, degassing tank A
The metal M in the inside also drops and accumulates in the bag E.

The bag E is placed on the trolley C, carried in and out of the lower portion of the degassing tank A, and moved up and down by the elevating device L so as to be detachable from the dipping pipe S and the duct D.

Further, as shown in FIG. 7, two degassing tanks A ₁ and A ₂ are prepared. For example, while one degassing tank A ₁ is being degassed at the processing position I, the other degassing tank A _{2 is} At the standby position II, the lower tank is exchanged with the exchanging cart BC ₁ and the inside of the tank is heated. On the contrary, while the other degassing tank A ₂ is being degassed at the processing position I, one degassing tank A ₁ is at the standby position III as described above.
The lower tank is exchanged with the exchange cart BC ₂ , and the inside of the tank is heated. In this case, the degassing tanks A ₁ and A ₂ are moved by the carriages AC ₁ and AC ₂ in the arrow X direction, and the lower tank exchange carriages BC ₁ and B 2
C ₂ moves in the direction perpendicular to the paper surface of the drawing (Y direction).

Even when two degassing tanks are provided in this way, the heating during standby does not change in structure from that shown in FIG.

<Problems to be Solved by the Invention> Usually, the degassing tank is divided into upper and lower parts, and the lower tank is often replaced and repaired by a lower tank replacement cart. Therefore,
In order to install the trolley C, each device in the vicinity of the degassing tank is complicated and the work area is unnecessarily narrowed, and the moving route between the lower tub exchanging trolley and the trolley is also complicated, and its operation is also difficult. Not only will it be troublesome, but the equipment costs will also be large.

Particularly, in the degassing apparatus having two degassing tanks shown in FIG. 7 to which the present invention is applied, the apparatus itself is already complicated, and simplification of the metal processing apparatus has been desired.

Further, although the bag E needs to be discharged to the outside of the apparatus by the trolley C, the bullion needs to be discharged. However, the worker is placed in the bag E containing high-temperature bullion in order to remove the lid or open the bullion discharge port. They had to approach each other, which was troublesome, and they were forced to work hard.

INDUSTRIAL APPLICABILITY The present invention solves the problems of the conventional techniques as described above, the equipment cost as a bullion recovery device for a degassing tank is low, and the combustion exhaust gas hood also serves as the lid of the container containing the bullion. It is an object of the present invention to provide a new bullion recovery device which is capable of being automatically attached to and detached from a bullion container.

<Means for Solving the Problems> The present invention has two degassing tanks, and the degassing tanks are alternately used at a standby position and a common degassing processing position, and each of them is used. A metal collecting device for a degassing tank in a vacuum degassing device having a lower tank exchanging truck for a degassing tank at a standby position, the entire upper surface of which is opened and placed on each of the lower tank exchanging trucks when used. It has two lower metal containers for collecting metal and a hanging hand, and has an opening on the top surface into which the immersion pipe of the vacuum degassing tank can be inserted and a connecting duct for combustion exhaust gas. One upper hood placed on the lower container for collecting metal on the lower tank exchange trolley, a self-propelled trolley having a suspension member for suspending and holding the upper hood, and a work floor The self-propelled type installed on the bottom surface bypassing the degassing treatment position of the vacuum degassing tank. The problem of the conventional art is solved by forming the metal collecting device from the rail for guiding the carriage to the upper part of the moving path of the lower tank exchanging carriage in the vicinity of each standby position of the vacuum degassing tank.

<Operation> The metal collecting container is divided into a lower container and an upper hood, and the lower container for collecting metal (hereinafter simply referred to as the lower container) has its entire upper surface open so that the metal can be easily taken out when discharging the metal. did. In addition, two lower containers are prepared, and they can be moved and moved up and down by being placed on the lower exchange carts of the degassing tanks,
No special loading and unloading equipment is required for the bullion recovery work, and the handling of the lower container is simple.

On the other hand, the upper hood is provided with an opening for inserting the immersion pipe of the degassing tank on the upper surface thereof and a connecting duct for combustion exhaust gas. Furthermore, a lifting handle is attached to this upper hood.

Then, a self-propelled trolley having a hanging member for engaging and suspending the upper hood and suspending and holding the upper hood, and bypassing the degassing treatment position of the degassing tank on the lower surface of the work floor. A rail was provided for guiding the self-propelled carriage to the vicinity of each standby position of the degassing tank.

Therefore, it suffices to prepare one of the upper hoods, and it can be used by alternately carrying it to the degassing tank to be heated at the standby position among the two degassing tanks. Further, the hanging hand of the upper hood and the hanging member of the self-propelled carriage can be naturally attached / detached by the movement and lifting operation of the lower tank exchange truck of the degassing tank.

<Embodiment> FIGS. 1 to 5 are drawings showing an embodiment of a metal collecting device for a degassing tank according to the present invention. FIG. 1 is a sectional view of a lower container and an upper hood, and FIG. 2 is an upper portion. A plan view of the hood seen from above,
FIG. 3 is a front view of a self-propelled trolley and rails, FIG. 4 is a layout explanatory view of rails, and FIG. 5 is an explanatory view of a loading / unloading procedure of a bullion recovery device at a degassing tank standby position.

In FIG. 1, reference numeral 1 is a lower container, and the container is a trunnion.
11 and 11 are provided, and the entire upper surface is open. And 10 is an iron skin and 10 'is a refractory material. The trunnions 11 and 11 may be omitted, but it is more convenient to mount them in order to automate the tilting when discharging the collected metal.

Reference numeral 2 is an upper hood, which is placed on the upper surface of the lower container 1 when used as shown in FIG. Numerals 21 and 21 are trunnions serving as lifting hands, which engage with a hanging member 31 of the self-propelled carriage 3 shown in FIG. 3 described later to hold the upper hood. Reference numeral 22 denotes an opening into which the immersion pipe S of the degassing tank A is inserted, which has a diameter slightly larger than the outer diameter of the immersion pipe S. Reference numeral 23 denotes a connection duct for connecting to the combustion exhaust gas duct D, and the trunnion 21, the opening 22, and the connection duct 23 are arranged in this example as shown in FIG.

Further, reference numeral 24 is a stopper for preventing a displacement when it is piled up on the lower container 1, and is a strip-shaped iron piece, a steel bar or the like attached to the lower portion of the upper hood 2 by an appropriate number of welding. 20 is an iron skin and 20 'is a refractory material.

Next, referring to FIG. 3, a self-propelled carriage 3 for conveying the upper hood 2 will be described. The self-propelled carriage 3 has a frame 30 provided with a pair of hooks 31, 31 vertically. In the standby position of the degassing tank, the degassing tank is on the opening side. (See FIG. 5) Further, in this self-propelled carriage, the wheels 32 rotated by the traveling drive device 33 can roll and move on the rails 4.

The rail 4 is provided on the lower inner flange of the shaped steel 41, and the shaped steel 41 is installed on the lower surface of the work floor F by the support member 42.

The installation state of the rail 4 and the operation of the self-propelled carriage 3, that is, the upper hood 2 will be described with reference to FIG. The rail 4 is installed so as not to interfere with the degassing tank A ₁ during the degassing process, up to ZZ above the moving path of the lower tank exchanging cart near the standby positions II and III of each degassing tank. There is. Then, the self-propelled carriage 3 carries the upper hood 2 to the vicinity ZZ of the position II of the degassing tank A ₂ which is about to start heating. At this time, the connecting duct 23 of the upper hood 2 is directed outward of the device. Conversely, degassing tank A ₂ performs degassing processing, and A ₁ is in the standby position.
When starting heating at III, the vicinity of position III ZZ
Carry upper hood 2 to. At this time also the connection duct
The direction of 23 is the outside of the device.

The position of ZZ is the degassing tank A and the upper hood 2 in standby.
Must be in a position that does not interfere with. When the upper hood 2 is not used, the upper hood 2 is hung on the self-propelled carriage 3 and stands by at an appropriate place where it does not interfere with the work.

Next, referring to FIG. 5, a procedure for loading and unloading the bullion recovery device in the degassing device according to the present invention will be described.

In FIG. 5, the lower container 1 is placed outside the degasser on the lift table LT of the lower tank exchanging carriage BC, for example, by a crane (not shown), and first, at the position J in the drawing (Z-Z in FIG. 4).
It is loaded in the direction of arrow Ya up to the line).

On the other hand, the upper hood 2 is hung by the hanging member 31 attached to the lower part of the self-propelled trolley 3 above the moving path of the lower tub exchanging trolley BC that does not interfere with the degassing basin A via the hangers 21 and stands by. is doing. In this example, the hanging member 31 is a hook and the hanging hand 21 is a trunnion, but this may be reversed, and in any case, as described below, the lower hand tank exchanging cart BC moves in the direction of the arrow Ya and the hanging hand 21. The hanging member 31 becomes engaged and the arrow
It is necessary to be configured to be separated by movement in the Yb direction (or movement of the self-propelled carriage 3 in the Ya direction).

In the state shown in FIG. 5, the lower container 1 is raised by operating the elevating device L of the lower tank exchange cart BC, and the upper surface of the lower container 1 is brought into contact with the lower surface of the upper hood 2 and then slightly lifted together with the upper hood 2. . Then, when the lower tank exchange cart is returned in the direction of the arrow Yb opposite to the carrying-in direction, the hanging member 31 and the hanging hand 21 of the upper hood 2 are naturally separated.

After that, the whole is once lowered, further moved in the direction of the arrow Yb, and stopped at a position H directly below the degassing tank A. In that state, while aligning the opening 22 of the upper hood 2 and the immersion pipe S, the whole is raised to bring the immersion pipe S into the opening 22 (FIG. 1), and the connecting duct 23 and the duct D are connected. Connect and get ready.

After the heating of the degassing tank is completed, the reverse operation is performed to suspend the upper hood 2 on the suspension member 31 of the self-propelled carriage 3 on the lower surface of the work floor F and put it in the standby state. It is carried out to the outside of the degassing device by the lower tank exchange truck together with the contained metal.

The lower container 1 carried out of the degassing device is carried to a position such as a bullion discharge pit by a crane or the like (not shown), and mounted on the lower container tilting device via the trunnions 11, 11 and then tilted backward. By rolling, the metal can be discharged very easily.

<Effects of the Invention> As described above, the metal collecting device of the degassing apparatus according to the present invention divides the metal collecting container into a lower container and an upper hood, which are vertically divided into two.
Since the lower container is moved and lowered by the lower tank exchange cart, no special cart or lifting device is required, and the provision of the trunnion allows the tilting device to be used to discharge the metal very easily.

Further, the upper hood is automatically detachable by using the operation of the hanging member of the self-propelled trolley and the lower tank exchanging trolley on which the lower container is placed. Since only the lower container can be carried out to the outside of the degassing device by suspending it on the mobile trolley, it is not necessary to attach or detach the lid or the like, and the worker does not have to approach the hot metal container.

Also, there is an advantage that one upper hood can be used as two degassing tanks.

Therefore, it is possible to construct a device for collecting the bullion extremely inexpensively, and the working environment is significantly improved.

[Brief description of drawings]

1 to 5 are drawings showing an embodiment of a metal collecting device for a degassing tank according to the present invention. FIG. 1 is a sectional view of a lower container and an upper hood, and FIG. 2 is an upper hood from above. The plan view,
FIG. 3 is a front view of a self-propelled trolley and rails, FIG. 4 is an explanatory view of the layout of the rails, and FIG. 5 is an explanatory view of the loading / unloading procedure of the bullion recovery device at the degassing tank standby position. FIG. 6 is a drawing showing an example of a conventional bullion recovery device, and FIG. 7 is an explanatory view of the arrangement of a degassing device using two degassing tanks. 1 …… Lower container for collecting metal, 10 …… Steel skin, 10 ′ …… Refractory, 11 …… Trunnion, 2 …… Upper hood, 20 …… Steel skin, 20 ′ …… Refractory, 21 …… Hanger, 22 …… Opening, 23 …… Connecting duct, 24 …… Stopper, 3 …… Self-propelled trolley, 30 …… Truck frame, 31 …… Suspending member, 32 …… Wheels, 33 …… Traveling drive device , 4 ... Rail, 41 ... Shaped steel, 42 ... Supporting material, A ... Degassing tank, D ... Combustion exhaust gas duct, BC ... Lower tank exchange cart, F ... Working floor, S ... Immersion tube.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Yokoyama 1-chome, Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (No address) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (56) Reference JP 62-17117 (JP, A) ) Japanese Patent Laid-Open No. 2-77517 (JP, A) Jitsuko Sho 60-32873 (JP, Y2)

Claims (1)

[Claims] 1. A degassing tank having two degassing tanks, wherein the degassing tanks are alternately used at a standby position and a common degassing processing position, and the lower parts of the degassing tanks are provided at the respective standby positions. A metal collecting device for a degassing tank in a vacuum degassing device having a tank exchanging truck, wherein two upper lower portions for collecting metal are opened on the entire upper surface and placed on the respective lower tank exchanging trucks when in use. It has a container and a hanging hand, and has an opening on the top surface into which the immersion pipe of the vacuum degassing tank can be inserted and a connecting duct for combustion exhaust gas. One upper hood placed on the lower gold collecting container, a self-propelled cart having a hanging member for suspending and holding the upper hood, and a vacuum degassing tank installed on the lower surface of the working floor. The self-propelled carriage is bypassed to the degassing treatment position of the Bullion collecting apparatus for a vacuum degassing chamber, characterized in that it is composed of a rail for guiding up movement path above the lower vessel changing carriage standby position near the.