JPS6126719A - Method for removing deposit on converter port with cutting knife capable of moving back and forth - Google Patents

Abstract

PURPOSE:To cut off efficiently deposits on a converter port by moving a cutting knife capable of moving back and forth to the cutting position after molten steel is tapped from the converter, cutting off deposits on the furnace port while the converter is inclined, and then moving the cutting knife back to a standby position. CONSTITUTION:Molten iron in a converter B is blown by the signal from a sequence controller of the converter operation, and the converter is inclined after the completion of blowing to tap the molten steel. The furnace port A is then moved to the lowest position to tap slag. The signal of said position is outputted from said controller, and a cutting knife 6, which is provided to the working floor 1 for the converter operation and can be moved back and forth, is moved from a standby position (x) to a cutting position (y) by the operation of a hydraulic motor, etc. (not shown in the figure). At this position (y), the leading end 28 of the cutting knife 6 is positioned on a trajectory Z of the revolving peripheral part C of the furnace port A. Then the converter B is inclined in the direction indicated by the arrow W, and deposits D on said peripheral part C is cut off by the cutting knife 6. After the converter B is returned to an upright position, the cutting knife 6 is moved back to the standby position (x) by the signal of said position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for removing deposits on the mouth of a converter for recovering exhaust gas by using a cutting blade during tilting of the converter.

[Prior art]

The above-mentioned conventional cutting blade is a fixed cutting blade provided surrounding the converter as disclosed in Japanese Utility Model Publication No. 55-24129, and the fixed cutting blade is used while the converter is tilting. The deposits on the furnace mouth are removed by cutting, but if there is a large amount of deposits on the furnace mouth or the deposits have a property of high cutting resistance, the converter may become unable to tilt, or There is a drawback that the tilting device and cutting blade of the converter may be damaged.

Therefore, the present applicant has developed a device for cutting and removing deposits at the mouth of a converter, which has a cutting blade that can move forward and backward into the converter, and has filed a patent application.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for efficiently cutting and removing deposits on the furnace mouth using the above-mentioned movable cutting blade.

[Structure of the invention]

The present invention advances the cutting blade to the cutting position by a specific position signal of the converter after the completion of tapping of the converter operation sequence control device, cuts off the deposits on the furnace mouth during tilting of the converter, and completes the cutting. The method further comprises a step of retracting the cutting blade to a standby position using a specific position signal of the converter of the converter operation sequence control device, thereby achieving the above object.

Hereinafter, one embodiment of the method of the present invention will be described in detail.

First, a device for cutting and removing deposits on the mouth of a converter to which the method of this embodiment is applied will be schematically explained with reference to FIGS. 1, 2, and 3.

FIG. 1 is a top view of the cutting and removing device, FIG. 2 is a side view of FIG. 1 with the drive portion removed, and FIG. 3 is a piping diagram of the hydraulic motor. As shown in Fig. 1.2, this cutting/removing device has a handle 5 that is slidable by rollers 4 of a guide roller box 3 that hangs down from a pedestal 2 that is vertically installed on the lower surface of the converter work floor j. The noid 7 is supported and has an arc-shaped cutting blade 6 at the tip of the handle 5.
゜Accordingly, the cutting blade 6 is connected to a drive shaft 9 equipped with a spur gear (not shown) meshing with a rack 8 fixed to the handle 5, and a drive hydraulic pressure connected via a reducer lot. It is moved forward and backward relative to the converter by a motor 12 (FIG. 3). The hydraulic motor 12 is connected to a hydraulic bonder 13 and an oil tank 44 through a nozzle 15.16, and the nozzle 15 is connected to an IJ valve 17. Pressure gauge18. Pressure switch 19. Pressure transmitter 20. Flow rate adjustment valve 21. It has a three-way switching solenoid valve 22, and the nozzle 16 has a relief valve 23.
, lE force meter 24° flow rate adjustment valve 25. It has a three-way switching solenoid valve 22.

Number 3, 26 in the figure is a relief valve 17.23+! : A type that connects with the oil tank 14. 27 is a drain pipe of the hydraulic motor 12.

Next, an embodiment method of cutting and removing a converter kimono using the above-mentioned cutting and removing device having a movable cutting blade will be described.

The converter charges hot metal and blows it according to signals from the converter operation sequence control device, and after the blowing is completed, it is tilted to tap the iron, and then tilted to discharge the slag as shown in Figure 4. The cutting blade 6 of the cutting and removing device is on standby at a distance of 2720 m from the rotational trajectory Z of the converter mouth A until the tilting is stopped in response to a signal from the sequence control device. With the cutting blade on standby at position The hydraulic motor 12 is activated by operating the hydraulic denzo 13.
The cutting blade 6 is moved forward toward the converter by driving the cutting blade 6.
The cutting end 28 is stopped at a cutting position y where the tip 28 circumscribes the rotation locus Z of the furnace mouth. In this embodiment, the cutting blade at this cutting position comes into contact with the peripheral edge O of the furnace mouthpiece while the tilt angle of the converter B changes from 160° to 110°. Converter B begins to tilt counterclockwise as indicated by arrow W, i.e., in Fig. 4, and the tilting angle of the converter reaches 16 (1°).
The cutting blade 6 comes into contact with the deposits on the furnace mouth in the vicinity and starts cutting and removal, and ends in the vicinity of the tilt angle 110'.

If the cutting resistance exceeds the set pressure of the hydraulic motor at a location where there is a large amount of deposits during the above-mentioned cutting and removal, the cutting blade 6 retreats and resumes cutting when the cutting resistance becomes equal to the pressure. The furnace will not be tilted or the tilting device or cutting/removal device will be damaged.

When the amount of deposits is large, the converter is tilted to 160°, and while the tilting angle is 11.0°, cutting is performed 1, and this process is repeated to sufficiently remove the deposits.

The converter is tilted to return to the upright state in response to a signal from the sequence control device indicating the completion of cutting and removing the deposits at the furnace mouth, which is detected by means such as measuring the height of the deposits, and when the converter is upright, the sequence control device The tilting of the converter is stopped by a signal from the converter, and at the same time, the three-way switching solenoid valve is operated by this signal to return the cutting blade 6 to the standby position.

In the above example, the cutting blade was moved to the cutting position by a signal from the 7-case control device that stopped the tilting of the converter when the furnace mouth was directly below the converter. A specific position signal of the converter, such as a signal that detects that the furnace mouth has passed a point at the height of the cutting blade, a signal that detects that the tilt angle of the converter has increased to 110 degrees, and a signal that indicates the end of slag removal work. In addition, in the embodiment, the cutting blade was returned to the standby position by the converter upright stop signal after the cutting removal was completed, but the converter identification after the cutting removal was completed. Position signal, for example, if the tilt angle of the converter is less than 110° (105° or 100°)
The cutting blade may be returned to the standby position by a signal detecting that the temperature has reached 900°, a scrap loading signal, or the like.

〔Effect of the invention〕

In the method of the present invention, the cutting blade is advanced to the cutting position by a specific position signal of the converter after the output of the converter operation jitance control device, and the deposits on the furnace mouth are cut and removed while the converter is tilted. Since the cutting blade is retreated to the standby position by the converter specific position signal of the converter operation sequence control device after the completion of cutting and removal, unmanned and fully automatic operation is possible without requiring any personnel to operate the cutting and removal device. Compared to the case where the cutting blade is moved forward to the cutting position and stopped manually, the time is reduced by approximately 60 seconds, and the deposits on the furnace mouth can be efficiently cut and removed.

[Brief explanation of the drawing]

Figure 1 is a top view of an embodiment of a converter mouth deposit removal device to which the method of the present invention can be applied, and Figure 2 is a side view of Figure 1 (
3 is a piping diagram of the hydraulic motor, and FIG. 4 is an explanatory diagram of the relative positions of the converter and the cutting blade. A... Furnace mouth, B-... Converter, D... Deposits, X...
・Standby position, y... Cutting position, 6... Cutting blade agent Patent attorney Akisawa Masaru 2 outside parties 1 person? Diagram 3

Claims (1)

[Claims] (1) The converter operation sequence control device advances the cutting blade to the cutting position using the specific position signal of the converter after the completion of tapping, and during the tilting of the converter, the cutting blade cuts and removes the deposits on the furnace mouth. A method for removing deposits at the mouth of a converter using a movable cutting blade, characterized in that the cutting blade is retreated to a standby position in response to a specific position signal of the converter of the converter operation sequence control device after completion of cutting and removal.