JPS6148509A - Method for removing deposit on throat of converter by heating and cutting - Google Patents

Abstract

PURPOSE:To reduce the cutting resistance of a deposit on the throat of a converter and to remove easily and smoothly the deposit by cutting in a short time without damaging the throat by heating the deposit and cutting it by making use of the tilting force of the converter. CONSTITUTION:While a converter placed with the throat B down to discharge slag tilts in the direction of an arrow W, a cutting edge 6 is moved toward the converter. Before the edge 6 reaches a deposit C on the throat B, gaseous fuel is blown from a nozzle 10 and fired to soften the deposit C by heating. The edge 6 is them brought into contact with the deposit C, and the deposit C is removed by cutting with the edge 6, utilizing the tilting force of the converter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of cutting and removing deposits on the furnace mouth when the converter is tilted by using the tilting force of the converter.

[Prior art]

As a method for removing deposits from the converter mouth,
As disclosed in Japanese Patent Publication No. 24129, a fixed cutting blade surrounding the converter is used to utilize the tilting force of the converter when the converter is tilted, and the fixed cutting blade is used to cut and remove deposits on the converter mouth. (2) A method of blowing oxygen gas onto deposits from a nozzle to fuse and remove the deposits, as disclosed in Japanese Patent Application Laid-Open No. 51-110401, is known.

[By problem to be solved]

The conventional method (1) above has the disadvantage that it cannot be applied when the converter mouth deposits are cut and removed because the converter cannot tilt, etc., and the conventional method (2) above cannot be applied when the converter mouth deposits are melted. There are disadvantages in that the furnace opening may be damaged and it takes a long time to remove deposits from the furnace opening.

[Means to solve the problem] There is.

The method of the present invention will be explained in detail below with reference to Examples.

〔Example〕

First, a cutting and removing device that implements the method of the present invention will be briefly described.

FIG. 1 is a bottom view of the cutting and removing device, FIG. 2 is a side view of the fc 1-, excluding the driving portion, and FIG. 3 is a detection calculation command circuit diagram.

As shown in FIGS. 1 and 2, in this cutting and removing device, a handle 5 is slidably moved by a roller 4 of a guide roller ZX 3 hanging down from a pedestal 2 suspended from the lower surface of a converter working floor 1. A cutting tool 7 is supported and has an arc-shaped cutting blade 6 at the tip of the handle 5; a nozzle 10 extending toward the cutting blade 6 from a heating header 9 fixed to the lower surface of a base 8 of the cutting blade 6; A heating device having a flexible tube 13 that connects the header 9 and the fuel gas supply connection part 12 of the mount, and a spur gear 1 that meshes with a rack 14 fixed to the handle 5 of the cutting tool 7.
5 and a driving hydraulic motor 18 connected to the support shaft 16 of the spur gear 15 via a reducer 17, and as shown in FIG. A three-way solenoid valve 19 that performs forward rotation, reverse rotation, and stop, a relief valve 20 that discharges oil when the oil pressure of the hydraulic motor exceeds a certain predetermined pressure, and the cutting blade 6, that is, the nozzle 10, rotate! A signal from a position detector 21 that detects the position of the nozzle 1o as it moves forward toward the furnace, and a signal from a gas injection start position setting device 22 that sets the position of the nozzle 10 to inject fuel gas. Compare gas supply
A comparator 25 sends a signal to start gas supply to a flow rate regulator 24 provided on the tube 23, and a signal from a cutting position setter 26 sets the cutting position at which the cutting blade 6 cuts and removes deposits from the furnace mouth. The current position of the blade 6 is compared with the signal from the detector 21, and a signal to stop the cutting blade 6 at the cutting position is sent to the cutting blade command circuit 27, and the flow rate is adjusted so that the amount of injection from the nozzle 10 becomes a predetermined amount. Comparator 2 providing a signal to regulator 24
8 and a detection control device.

Note that 29 is a flame detector, and 30 is a cutoff valve that shuts off the gas supply in response to a signal from the flame detector.

The cutting and removing device described above operates as follows.

As shown in FIG. 4, while the converter A is tilted in the direction of arrow W from the slag discharge position with the furnace mouth B directly below, the hydraulic motor is driven to advance the cutting blade 6 in the direction of the converter A. Furnace deposits C
The gas injection start position setting device 22
The comparator 25 compares and detects that the position χ has been reached based on the signal from the position detector 21, and the flow regulator 24 is opened to inject the fuel gas from the nozzle 10 and ignite it. At this time, the front side of the converter tilting kimono C is heated by the ignited flame, but it has not come into contact with the cutting blade.

The cutting blade 6 and the nozzle 10 continue to advance, while the converter also moves W.
leaning in the direction. Then, the signal from the cutting position setter 26 and the signal from the position detector 21 are detected by the comparator 28 to indicate that the cutting blade has reached the predetermined cutting position y, and the signal is input to the command circuit 27 to control the three-way switching valve. 19 to stop the cutting blade 6 and nozzle 10 from advancing, and at the same time switch the flow rate regulator 2
4 further to increase the amount of fuel gas supplied. At this time, the tilting front end of the furnace mouth deposit C (FIG. 4) comes into contact with the cutting blade 6, and cutting is started.

Before being cut by the cutting blade, the furnace mouth deposits C are heated by flame from the nozzle 10 and become softened, and the softened deposits are removed by cutting with the cutting blade.

The thickness of deposits that can be removed by cutting and removing as shown in FIG. 1 is greatly increased compared to the case without heating, and the flatness of the cut surface is improved.

FIG. 5 shows an example of the thickness and flatness of one cut when the method of the above embodiment is used to remove the material by cutting without heating. FIG. 4 shows that the cutting thickness obtained by the method of this embodiment is approximately twice that of the case without heating, and the flatness is also extremely good.

〔Effect of the invention〕

According to the present invention, since the deposits on the furnace mouth are heated prior to cutting and removal, the cutting resistance of the deposits on the furnace mouth is reduced, and even if the cutting thickness is such that the converter cannot be tilted without heating, the converter will not be able to tilt. The flatness of the cut surface is improved. In addition, compared to conventional fusing removal methods, the time required to remove deposits can be greatly shortened, and the furnace mouth is not damaged.

According to the apparatus to which the above embodiment is applied, the method of the present invention can be carried out automatically, and even if the flame goes out, this is detected and the supply of fuel gas is stopped, so there is an advantage that work can be carried out safely.

[Brief explanation of the drawing]

Figure 1 is a bottom view of the device used in the example, and Figure 2
The figure is a side view of Figure 1 excluding the driving part, Figure 3 is a detection calculation command circuit diagram, Figure 4 is an explanatory diagram showing the tilting of the converter, the cutting blade, and the forward position of the nozzle, and Figure 5 is the main FIG. 3 is a diagram showing the cutting thickness and flatness of the invention method and those of the conventional method. A... Converter, B... Furnace mouth, O...
・・・Adherence, 6... Cutting blade, 10°...
nozzle. Agent Patent Attorney Masaaki Aki Sawa 2 Mitsugai 7t'1 Figure Piece 2 Figure W3 Figure 7?4 Figure ttC

Claims (1)

[Claims] (1) A method for cutting and removing deposits on the furnace mouth using the tilting force of a converter, the method comprising heating the deposits on the furnace mouth prior to the cutting and removal. .