JPH03126807A - Method for maintaining metallurgical vessel and opening hole thereof and device for using to these - Google Patents

Abstract

PURPOSE:To secure automation and safely of steel tapping operation of a metallurgical vessel and maintenance operation after steel tapping by arranging a molten metal discharging hole having the prescribed angle to vertical axis of the furnace at the bottom part of the melting furnace of the refining furnace. CONSTITUTION:The molten metal discharging hole 2 is arranged upward with the prescribed angle at the part from corner part of the furnace bottom to the furnace belly part in a converter 1. This molten metal discharging hole 2 is opened by breaking through packing layer formed by sintering therein with operation of a remote controlling mechanical device. Further, after discharging the molten metal, the inner face of molten metal discharging hole 2 is prepared with the operation of the remote controlling mechanical device. The above hole opening device 3 has such constitution that a pushing rod 10 for opening hole fitted to a supporting lever 12 is worked in advancing/retreating directions with an air cylinder 13. Further, the above preparing device 4 has such constitution that rotation and percussion force and given with a drifter 16 moving to advancing/retreating direction to a bit 14 having a little smaller diameter than that of the molten metal discharging hole 2 fitted to a road 15 through a guide cell 17. Further, it is desirable that these devices 3, 4 are fitted to a traversing carriage 7 under assembling and traversely shifted and faced to the above discharging hole 2.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a metallurgical container such as a converter, a method for opening and maintaining a molten metal outlet (tapping port) provided at the bottom of the furnace, and It concerns the equipment used.

(Prior art) Refining furnaces such as converters have a tapping port at the top of the furnace body, so steel is tapped by tilting the furnace body greatly using a tilting device. If a tapping port that can be opened and closed is provided at the bottom of the converter, steel can be tapped without tilting the furnace body, and the drop in the temperature of molten steel in the furnace can be suppressed, reducing wear and tear on the bricks in the upper part of the furnace body. . Furthermore, this converter will enable scrap melting (PSR method) work, and in the future, in combination with degassing treatment, the reduced pressure furnace bottom tapping method (steel tapping directly from the bottom of the furnace into a vacuum vessel) will be adopted. This can be expected to lead to the elimination of the degassing process.

(Problem to be solved by the invention) However, when a tap hole is provided at the bottom of the furnace, the tap hole must be opened every time steel is tapped, and sometimes the hole may become clogged and cannot be discharged. .

As a means of dealing with this, holes are manually opened using a jet lance that can melt metal and slag by passing oxygen gas through the steel pipe and burning it from the tip of the steel pipe. One possible method is to perform post-steel maintenance. However, it is extremely dangerous to drill holes and tap steel while the furnace is in an upright position, and there are also safety issues such as high radiant heat from the steel shell and falling metal and slag. Work-dependent drilling and maintenance work is not possible.

The present invention was made to solve such problems,
The object of the present invention is to provide a metallurgical vessel having a tap hole provided at the bottom of a refining furnace such as a converter, a method for opening and maintaining the tap hole in this case, and an apparatus used for these methods.

(Means for Solving the Problems) In order to achieve the above object, the metallurgical container according to the first aspect of the present invention is provided with a metallurgical container that holds molten metal at a predetermined angle with respect to the vertical axis of the furnace at the bottom of a melting furnace or a refining furnace. This means that a discharge port is provided.

Further, in the metallurgical vessel according to the second aspect of the present invention, a molten metal discharge port is provided upward at a predetermined angle from the bottom corner of the melting furnace or the refining furnace to the furnace belly.

Further, the method for opening and maintaining the molten metal outlet of the metallurgical vessel according to the third aspect of the present invention is such that the molten metal outlet of the metallurgical vessel according to the first aspect of the present invention is opened and maintained within the molten metal outlet by operating a mechanical device by remote control. This is a method in which the sintered packed layer is destroyed and holes are opened.

A fourth aspect of the present invention is a method of servicing the inner surface of the molten metal discharge port by operating a remotely controlled mechanical device after the molten metal is discharged.

In a fifth aspect of the present invention, as a hole-opening device used in these methods, a hole-hole punch rod supported by a support rod is moved forward and backward by the operation of an air cylinder.

Further, the hole opening/maintenance device according to the sixth aspect of the present invention is equipped with a jet lance provided with piping for supplying oxygen and gas, a holding means for the jet lance, and a means for operating the opening/exit of the discharge port.

Further, the seventh invention provides a bit connected to the rod end;
It is provided with a drifter that applies rotational and impact force to this, and a guide cell that moves the drifter forward and backward.

Furthermore, in the eighth aspect of the present invention, the hole-drilling device and the hole-drilling/maintenance device are mounted on the traversing truck, and if necessary, each device is positioned opposite to the molten metal discharge port to perform the intended operation. It is something.

(Function) With the metallurgical vessel, method, and equipment as described above, the molten metal outlet, which is provided at the bottom of the furnace at a predetermined angle to the vertical axis of the furnace, requires manual work to open and maintain. Everything can be done mechanically. In addition, the furnace itself can be tapped without being tilted at all, and maintenance readiness can be established with very little tilting, and the purpose can be achieved by selecting appropriate maintenance equipment.

(Example) An embodiment of the present invention will be described above based on the drawings.

1 is a converter, and a molten metal discharge port 2 is provided at the bottom corner of the converter. This molten metal outlet 2 is located at 1 point with respect to the vertical axis of the furnace.
It is installed with an inclination angle of 0 to 90 degrees, which secures the installation space for the molten metal discharge hole opening device and maintenance device, which will be described later, and enables scrap melting (PSR) without significantly tilting the furnace. This makes it possible to conduct operations such as the method (method) and refining using the bottom tapping method.

Reference numeral 3 designates a hole-drilling device, 4 a maintenance device, and 5 a hole-drilling/maintenance device. By the operation of the driving cylinder 9, the hole opening device 3 and the maintenance device 4 or the hole opening/maintenance device 5 are moved, and each is arranged to face the molten metal discharge port 2 when necessary.

By the way, the hole-drilling device 3 includes a hole-drilling ram 10, a support rod 12 provided with a fixture 11 for detachably holding the proximal end of the ram 10, and a support rod 12 that connects the ram 10 through the support rod 12. It consists of an air cylinder 13 that moves forward and backward, and destroys the sintered filling layer in the molten metal outlet 2 and opens holes during tapping.

Further, the hole drilling/maintenance device 4 includes a bit 14 for removing and maintaining base metal and slag attached to the inner wall surface of the molten metal discharge port 2 after tapping, a rod 15 to which the bit is attached, and the rod 15. The drifter 16 is provided with a hydraulic or pneumatic drifter 16 that applies rotation and striking motion to the bit 14 through a guide cell 17, and the drifter 16 moves back and forth along a guide cell 17 to move the bit 14 over the entire length of the molten metal discharge port 2. Make maintenance work.

Reference numeral 18 denotes an arm for effectively utilizing the impact force of the bit 14, and connects the guide cell 17 and the furnace body when the centering of the device with respect to the furnace is completed.

Further, the hole opening and maintenance device 5 shown in FIG. Holding means 21 for lance 19, jet lance 1
9 is slowly moved in and out of the molten metal discharge port 2, an actuating means 22 such as a moder cylinder, and a slide frame 2.
It has 3.

The hole drilling device 3, the maintenance device 4, and the hole drilling/maintenance device 5 are as follows:
As explained earlier, each is mounted on the transverse carriage 7 via the frame 8, and each is selectively used as required. This is performed by the slight movement 1ji1 of the truck 7. These devices are located in the lower space of the converter 1, and are therefore located near the molten metal discharge port 2 provided at the bottom of the furnace, and the tapping operation is performed without tilting the furnace body. Maintenance is possible by tilting the furnace body very slightly.

(Effects of the Invention) As described above, according to the present invention, for example, a converter having a molten metal discharge port at the bottom of the furnace, the tapping operation and the maintenance operation after tapping can be remotely commanded. This can be done primarily by mechanical operation, and safety is ensured through automation. Further, according to the present invention, not only can steel be tapped without tilting the furnace body, but also the drop in the temperature of molten steel in the furnace can be suppressed, furthermore, the wear and tear of the upper bricks of the furnace body can be prevented, and scrap melting (PSR method) work can be carried out using a converter. By adopting the reduced pressure furnace bottom ejecting method in combination with degassing treatment, it is expected that the degassing treatment step can be omitted.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view of the entire device including its relationship with the furnace body, and FIG. 2 is a front view of the hole opening/maintenance device using a jet lance. 1 is a converter, 2 is a molten metal discharge port, 3 is a hole opening device, 4 is a maintenance device, 5 is a hole opening and maintenance device, 7 is a traversing truck, 10 is a thrust rod, 12 is a support rod, 13 is an air cylinder, 14 is a bit, 15 is a rod, 16 is a drifter, 117 is a guide cell, 19 is a jet lance, 20 is piping, and 22 is an operating means.

Claims (8)

[Claims] (1) A metallurgical vessel characterized in that a molten metal outlet is provided at the bottom of a melting furnace or a refining furnace at a predetermined angle with respect to the vertical axis of the furnace. (2) A metallurgical vessel characterized in that a molten metal outlet is provided upward at a predetermined angle from a bottom corner of a melting furnace or a refining furnace to a furnace belly. (3) A method for opening a molten metal outlet at the bottom of a furnace, comprising piercing the molten metal outlet of a metallurgical vessel according to claim 1 by operating a remotely controlled mechanical device. (4) After opening the molten metal outlet and discharging the molten metal by the method according to claim 3, deposits on the inner surface of the molten metal outlet are removed by operating a remotely controlled mechanical device. How to maintain the outlet. (5) Used in the method according to claim 3, characterized in that the method comprises a hole-opening punch rod, a support rod that supports the punch rod, and an air cylinder that moves the punch rod forward and backward through the support rod. A device for opening the molten metal outlet at the bottom of the furnace. (6) A claim characterized by comprising a jet lance, a pipe for supplying oxygen gas to the jet lance, a holding means for fixing the jet lance, and an actuating means for moving the jet lance in and out of the molten metal outlet. A device for opening and maintaining a molten metal outlet at the bottom of the furnace used in the method described in Item 3 or 4. (7) A bit with a diameter slightly smaller than the diameter of the molten metal outlet,
A rod connecting the bit, a drifter that applies rotation and impact force to the bit via the rod, and a guide cell that moves the drifter forward and backward every time to insert the bit into the molten metal discharge port. A molten metal outlet maintenance device used in the method according to claim 4. (8) A traversing trolley equipped with a traversing drive device is installed on the work floor,
Any two of the hole opening device according to claim 5, the hole opening/maintenance device according to claim 6, and the maintenance device according to claim 7 are assembled to the traversing truck, and each device is installed at the discharge port when necessary. A device for opening and maintaining a molten metal discharge port at the bottom of the furnace, characterized in that it can be used by moving it laterally so as to be opposite to the bottom of the furnace.