JPH0459914A - Device for recovering metal in vacuum degassing vessel - Google Patents

Abstract

PURPOSE:To extremely easily execute discharge of metal while using a tilting device without needing the specific truck and lifting device by dividing a metal recovering device into upper and lower two parts of a lower vessel and an upper hood, and making the lower vessel shiftable and liftable with a lower vessel exchange truck. CONSTITUTION:Trunnions 11, 11 are arranged on the lower vessel 1 and the whole upper face is made to opening condition. The lower vessel 1 is outer part of a degassing apparatus and laid on a lifting table LT in the lower vessel exchanging truck AC with e.g. crane, etc., and carried to the arrow mark Xa direction to the position J. By operating the lifting device L in the lower vessel exchanging truck AC, the lower vessel 1 is lifted, and after abutting the upper face thereof on lower face of the upper hood 2, the vessel 1 is lifted further a little together with the upper hood 2. Then, by returning back the lower vessel exchanging car-truck toward the reverse arrow mark Xb direction to the carry-in direction, hooking members 3 and hangers 21 in the upper hood 2 are naturally detached. The lower vessel 1 conveyed to out of the degassing apparatus, is conveyed to a position of metal discharging pit, etc., and after fitting to the lower vessel tilting device through the trunnions 11, 11 by tilting this, the metal can easily be discharged.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a vacuum degassing device for performing secondary refining of molten steel in a steel factory, and particularly relates to a DH having a lower tank exchange cart for a vacuum degassing tank. Or it relates to a bullion recovery device in an RH type vacuum degassing device.

<Prior art> Vacuum degassing equipment is difficult to process molten steel if the internal temperature of the vacuum degassing tank (hereinafter referred to as the degassing tank) is low during secondary refining of molten steel. Even when processing is interrupted (hereinafter referred to as non-processing time), it is necessary to heat the inside to maintain heat.

This heating is generally performed by burning the fuel gas using a burner placed above the degassing tank.

(Japanese Unexamined Patent Publication No. 2-77517, etc.) The combustion exhaust gas generated at this time is often discharged from a submerged pipe at the bottom of the degassing tank, and guided out of the apparatus through an exhaust gas duct.

Further, when the degassing tank processes molten steel, the molten steel being processed scatters and adheres to the degassing tank, becoming so-called base metal. This metal must be recovered because it melts again when the degassing tank is heated and falls.

FIG. 4 shows an example of the bullion recovery device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-77517.

In the figure, degassing tank A is heated by burning fuel gas with burner B when not undergoing treatment. The combustion exhaust gas is then discharged from the immersion pipe S into the bag E, and is further guided out of the apparatus through the duct D and dissipated. At this time, the metal M in the degassing tank A also falls and is deposited in the bag E.

The bag E is placed on a trolley C and transported to the lower part of the degassing tank A, and can be raised and lowered by a lifting device to be connected to and disengaged from the dipping tube S and the duct D.

<Problems to be Solved by the Invention> Usually, a degassing tank is divided into an upper and a lower part, and the lower tank is often replaced and repaired using a lower tank exchange trolley. Therefore,
In order to install the trolley C, each device near the degassing tank becomes complicated and the work area becomes unnecessarily narrow, and the movement route between the lower tank exchange trolley and the trolley becomes complicated, and its operation becomes difficult. Not only will this be a hassle, but the equipment costs will also be large.

Furthermore, it is necessary to discharge the bullion after the bung E is carried out of the device using the cart C, but after removing the lid or opening the bullion discharge port, the bung E must be tilted in some way to discharge it. . Therefore, it is necessary for the worker to approach the bung E containing the high-temperature metal, which requires time and effort and is forced to perform difficult work.

The present invention solves the problems of the conventional technology as described above, and provides a bullion recovery device for a degassing tank that has low equipment cost and can easily perform bullion discharge work. purpose.

<Means for Solving the Problems> The present invention provides a bullion recovery device for a vacuum degassing tank having a lower tank exchange cart, which has a trunnion whose entire top surface is open and tilts when discharging bullion. In this case, the lower container for metal recovery is placed on the lower tank exchange trolley, has a hanger, has an opening on the top surface into which the immersion pipe of the vacuum degassing tank can be inserted, and has a connecting duct for combustion exhaust gas. an upper hood that is provided and placed on the lower container for collecting bullion when in use;
The bullion recovery device is composed of a hanging member installed on the underside of the work floor to hang and hold the upper hood at a position above the moving route of the lower tank exchange cart so that it does not interfere with the degassing tank when the upper hood is not in use. By doing so, the above-mentioned problems in the conventional technology were solved.

<Function> The bullion recovery container is divided into a lower container and an upper hood, and the entire upper surface of the lower container for bullion recovery (hereinafter simply referred to as the lower container) is left open so that bullion can be easily taken out when bullion is discharged. In addition, since a trunnion is provided, the container itself can be easily tilted and automation is possible.

Further, since the lower container can be placed on the lower tank replacement cart of the degassing tank and moved and moved up and down, no special transport equipment is required for bullion recovery work.

On the other hand, the upper hood is provided with an opening on its upper surface so that the immersion pipe of the degassing tank can be inserted therein, and a connecting duct for the combustion exhaust gas. Furthermore, a hanger is attached to this upper hood.

A hanging member is provided on the underside of the work floor to hang and hold the upper hood at a position above the moving path of the lower tank exchange cart so that it does not interfere with the degassing tank when the upper hood is not in use.

Therefore, when the upper hood is not in use, it can be held by the hanging member provided on the lower surface of the work floor and stand by.

The hanging member and the upper hood hanger are used to move the lower tank exchange trolley by bringing the upper surface of the lower container placed on the lifting platform of the lower tank exchange trolley into contact with the lower surface of the upper hood and slightly lifting it. It can be used to attach and detach naturally.

<Example> Figures 111i9 to 3 are drawings showing an embodiment of the degassing tank bullion recovery device according to the present invention, in which Figure 1 is a sectional view of the lower container and the upper hood, and Figure 2 is the upper hood. FIG. 3 is an explanatory diagram of the loading and unloading procedures within the degasser.

In FIG. 1, reference numeral 1 denotes a lower container, which is provided with a trunnion 11.degree. 11, and its upper surface is entirely open. 10 is an iron shell, and 10' is a refractory.

Reference numeral 2 denotes an upper hood, which is placed over the upper surface of the lower container 1 as shown in FIG. 1 when in use. Reference numeral 21.21 is a trunnion serving as a hanging hand, which engages with a hanging member 3 shown in FIG. 3, which will be described later, to hold the upper hood. Reference numeral 22 denotes an opening into which the immersion tube S of the degassing tank A is inserted, and has a diameter slightly larger than the outer diameter of the immersion tube S. 23 is a connecting duct for connecting to the combustion exhaust gas duct D; these trunnions 21. The opening 22 and the connection duct 23 are arranged as shown in the second example.

Further, reference numeral 24 denotes a stopper for preventing displacement when stacked on the lower container 1, and is made by attaching an appropriate number of rectangular iron pieces or steel bars to the lower part of the upper hood 2 by welding. 20 is an iron shell and 20' is a refractory material.

In the third article, the procedure for loading and unloading the bullion recovery device in the degassing device according to the present invention will be explained, as well as explaining the hanging member 3.

In FIG. 3, the lower container 1 is placed on the lifting platform LT of the lower tank exchange trolley AC by, for example, a crane (not shown) outside the degassing device, and is first moved to the position J shown in the figure by the arrow Xa.
Loaded in the force direction.

On the other hand, upper hood 2 is degassed P! Above the movement path of the lower tank exchange cart AC that does not interfere with the lower tank exchange cart AC, it is suspended via a hanger 21 by a hanging member 3 attached to the lower surface of the work floor F, and is waiting. In this example, the hanging member 3 is a hook,
The hanging hand 21 is a trunnion, but this may be reversed. In any case, as will be described later, the hanging hand 21 and the hanging member 3 become engaged when the lower tank exchange cart AC moves in the direction of the arrow Xa force, and vice versa. It is necessary to be configured to detach by moving in the direction of arrow xb force.

In the state shown in FIG. 3, the lower device 1 is raised by operating the lifting device of the lower tank exchange trolley AC, and after the upper surface of the lower device 1 comes into contact with the lower surface of the upper hood 2, the upper hood 2 is slightly lowered.
lift it together. Then, when the lower tank exchange trolley is returned in the direction of arrow xb force opposite to the carrying direction, the hanging member 3 and the upper hood 2
The hanging hand 21 will naturally detach.

Thereafter, the entire assembly is once lowered and further moved in the direction of arrow xb force, and stopped at position H directly below degassing tank A. In this state, while aligning the opening 22 of the upper hood 2 and the dip tube S, raise the entire body and insert the dip tube S into the opening 22.
is inserted into state B (FIG. 1), and the connection duct 23 and duct D are connected to complete preparation.

After heating the degassing tank, perform the reverse operation to the above, put the upper hood 2 in a standby state with the hanging member 3 on the underside of the work floor F, and replace the lower container 1 with the contained metal. It is carried out of the degassing equipment by a trolley.

The lower container 1 carried out of the degassing device was carried by a crane (not shown) to the position of the metal discharge bit, etc., and was mounted on the lower container tilting device via the L-runion 11.11. By tilting backward, the bullion can be discharged very easily. <Effects of the Invention> The bullion recovery device of the degassing device according to the present invention has the bullion recovery device separated from the lower container and the upper hood as described above. Divide into upper and lower parts,
Since the lower container can be moved and raised and lowered using a lower tank exchange trolley, there is no need for a special trolley or lifting device. Can be discharged.

Furthermore, the upper hood's hanging hand controls the movement of the hanging member installed on the lower surface of the work floor on the moving path of the lower tank exchange trolley at a position that does not interfere with the degassing tank, and the lower tank exchange trolley on which the lower container is placed. Since the upper hood can be left on standby and only the lower container can be taken out of the degasser, there is no need to attach or detach the lid, etc., and the operator can avoid high-temperature There is no need to approach the bullion collection container.

Therefore, equipment for recovering bullion can be constructed at extremely low cost, and the working environment is also significantly improved.

[Brief explanation of drawings]

Figures 1 to 3 are drawings showing an embodiment of the vacuum degassing tank bullion recovery device according to the present invention. Figure 1 is a sectional view of the lower container and the upper hood, and Figure 2 is the upper hood viewed from above. FIG. 3 is an explanatory diagram of the loading and unloading procedures within the degassing apparatus, and FIG. 4 is an explanatory diagram showing an example of a conventional bullion recovery apparatus. 1... Lower container for collecting bullion, 10... Iron shell, 10'... Refractory, 11
... Trunnion, 2... Upper hood, 20.
...Iron skin, 20'...Refractory, 21...
Hanging hand, 22... Opening, 23... Connection duct, 24... Stopper 3... Hanging member, A... Vacuum degassing tank, S... Soaking pipe, D... Exhaust gas duct , AC...lower tank exchange trolley, L...lifting device, LT...lifting platform. Patent applicant: Kawasaki Steel Corporation

Claims (1)

[Claims] In a vacuum degassing tank bullion recovery device having a lower tank exchange trolley, the entire upper surface is open and has a trunnion for tilting when discharging bullion, and when in use, the base metal recovery device is placed on the lower tank exchange trolley. It has a lower container for gold recovery and a hanger, and has an opening on the upper surface into which the immersion pipe of the vacuum degassing tank can be inserted, and a connecting duct for combustion exhaust gas. The upper hood is placed on the upper hood, and the upper hood is mounted on the underside of the work floor in order to hang and hold the upper hood at a position above the movement path of the lower tank exchange cart so that it does not interfere with the degassing tank when the upper hood is not in use. 1. A vacuum degassing tank bullion recovery device comprising: