KR20040019739A - Apparatus for measuring an amount of wear for porous plug in ladle - Google Patents

Abstract

PURPOSE: An apparatus for measuring a damage of a porous plug of a ladle is provided to precisely detect factors causing the damage to the porous plug of the ladle by measuring the damage of the porous plug using a laser distance sensor. CONSTITUTION: An apparatus for measuring a damage of a porous plug includes a laser distance sensor(8) and a control/signal processing section(10). The laser distance sensor(8) and the control/signal processing section(10) are mounted on a base section. A sensor moving section(7) is provided to protect the laser distance sensor(8) while driving the laser distance sensor(8). A plurality of laser distance sensors(8) is aligned on a sensor base in series. The sensor base is inserted into a linear motion guide. The damage of a porous plug detected by the laser distance sensors(8) is transmitted into a monitoring system(12) through the control/signal processing section(10).

Description

Loss measurement device for forus plug for ladle {APPARATUS FOR MEASURING AN AMOUNT OF WEAR FOR POROUS PLUG IN LADLE}

The present invention relates to an apparatus for measuring the loss amount of a forrus plug for ladle, and more particularly, a laser distance sensor (Laser distance sensor) for the loss amount and shape of a porou plug used for a ladle in a steelmaking refining process. This invention relates to an apparatus for measuring the loss of a forlas plug for a ladle to rationalize the maintenance of the ladle by clarifying the point of replacing the forsing plug by accurately measuring using a).

In general, there is a secondary refining process in which the post-treatment is performed according to the characteristics of the product required by the demand before casting the molten steel cast out of the converter in the steelmaking refining process. , Desulfurization of molten steel by basic slag, reduction action such as deoxidation, uniformity of molten steel temperature and components by gas blowing, and removal of impurities in molten steel.

In particular, the molten steel is stirred through blowing of an inert gas such as argon (Ar) to equalize the molten steel temperature and components and float and remove impurities of the molten steel to significantly improve the product quality of the subsequent process.

Gas blowing is a method of spraying at a high pressure through the lance (Lance) from the upper ladle, and the method of injecting the gas (3) through the porous plug (2) installed on the bottom of the ladle (1), molten steel (4) The latter is mainly used because it is efficient in terms of stirring (5) and impurities in molten steel.

The porous plug 2 is a porous refractory mainly composed of aluminum oxide (Al 2 O 3), and is located at the lower end of the ladle 1.

The molten steel which stays in the refining process of molten steel for a long time, and melt loss is caused by molten steel flow by gas blowing. If the molten steel of the porous plug 2 is excessively generated and cracks occur in the porous plug 2 or the molten steel contacts the gas blowing nozzle, hot molten steel flows out to the bottom of the ladle 1, which may cause a safety accident. If the critical melt amount of the porous plug 2 occurs, it is necessary to replace it.

Conventionally, after using a certain number of the melted amount of the porous plug after visual observation, it was determined empirically the replacement time. However, depending on the steel type, the molten steel residence time in the ladle is different and the gas blowing time is not constant, and the amount of melted porosity of the plug is not constant. It has been limited to determine the amount of melting of the above objects in a distance of 5m or more and ladle environment of high dust.

As a means for solving the above problems, a method of measuring the amount of melt by installing a structure on the upper end of the ladle and lowering the scaled iron rod to the porous plug is used, but the iron rod is deformed by the high temperature heat of the ladle. Not only was it difficult to maintain, but there were also a lot of errors,

There is a method of placing the low melting point metal near the gas inlet in the porous plug so that the gas inlet is blocked when the porous plug is gradually melted and the metal is melted. However, this is related to the safe operation of the porous plug. There was no.

In order to solve the above problems, the present invention by installing a distance sensor using a laser on the upper end of the ladle, by measuring the loss amount and shape of the porous plug from the specific data measured therefrom by measuring the loss amount of the operation conditions and the porous plug An object of the present invention is to provide a loss amount measuring apparatus for a forus plug of a ladle capable of evaluating a main factor of melting loss.

1 is a schematic diagram of agitation of molten steel in a ladle with argon gas bubbling through a porous plug;

2 is an overall configuration diagram of the apparatus for measuring the amount of loss for the porous plug of the ladle according to the present invention;

3 is a configuration diagram of the operation unit of the apparatus for measuring the amount of loss for the porous plug of the ladle according to the present invention;

4A is a photographic view of a forrus plug in ladles;

Figure 4b is a three-dimensional graph showing the results measured by the apparatus for measuring the loss amount of the porous plug according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

1: Radar 2: Forus plug 3: Argon gas 4: Molten steel 5: Molten steel flow

6: Device base 7: Sensor moving part 8: Laser distance sensor 9: LM guide

Reference Signs List 10 signal processing unit 11: cab 12 monitoring system 13: central control unit 14 shutter

15: gas spray nozzle 16: heat radiation window

In order to achieve the above object, the present invention includes a plurality of laser distance sensor is installed on the device base installed on the upper portion of the ladle to correspond to the poros plug of the lower surface of the ladle and moved by a sensor moving unit; A signal processor connected to the laser distance sensor and electrically installed on the device base; A cab monitoring system electrically connected to the signal processor; Provides a loss amount measuring device for a forlas plug of the ladle, characterized in that the control system is connected to the monitoring system and electrically controlled to control the entire device.

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration of the present invention.

2 is an overall configuration diagram of the porosity plug loss amount measuring device of the ladle according to the present invention, Figure 3 is a configuration diagram of the operation portion of the porosity plug loss amount measurement apparatus of the ladle according to the present invention.

As shown in FIG. 2, the apparatus for measuring the amount of loss of the porous plug of the ladle according to the present invention is a laser distance sensor 8 for measuring the amount of loss of the porous plug 2 that is melted by the molten steel of the ladle 1. And installing a device base 6 on the upper ladle 1 so that the control and signal processing unit 10 can be installed, and a sensor moving unit for driving the sensor 8 while protecting the laser sensor 8. (7) is installed.

The resolution of the laser sensor 8, which can measure the local melting loss of the forrus plug 2, uses a laser distance sensor that can measure within ± 2 mm of a high temperature object having a diameter of 5 mm within a distance of 30 m. It was.

In addition, in order to measure the melted shape of the porous plug 2, the laser distance sensors 8 are arranged in a row at intervals of 5 to 40 mm and installed in the sensor base 8a, and then the sensor base 8a is mounted on the LM guide. Inserted into (9) and configured to measure the melted hand shape while scanning along the LM guide 9 at intervals of 5 to 40 mm.

The melted shape measured by the distance sensor 8 is transmitted from the control and signal processor 10 to the monitoring system 12 of the cab 11.

In the monitoring system 12, the maximum amount of melt loss according to the number of times of use of each ladle 1 is displayed on the screen, and the current loss amount of the porous plug 2 is displayed on the screen in three dimensions. Signals to replace the forrus plug (2) when exceeded.

In addition, the central control unit 13 receives the main factors of the ladle loss, for example, molten steel residence time, gas bubble time, etc. to build the data to analyze and evaluate the effect of each factor on the forrus plug.

In addition, since the dust is generated in the high temperature ladle 1 environment where the porosity plug loss amount measuring device according to the present invention is installed, the sensor moving part 7 provided with the distance sensor 8 protects the sensor 8. In order to achieve a heat dissipation and dustproof apparatus,

In order to prevent dust, a shutter 14 that can be opened and closed is installed in the heat dissipation window 6 installed at the lower part of the sensor so that it is closed when not measured and opened when measured.

In addition, a gas spray nozzle 15 is installed to inject nitrogen gas in order to prevent cooling and dust inflow of the sensor moving part 7.

That is, when it is not measured, the sensor moving part 7 is always subjected to a positive pressure, and when it is measured, nitrogen gas is blown from the gas spray nozzle 15 at a pressure of 2 atm or less and comes up from the ladle 1. Protects sensor 8 by preventing hot convection and dust.

In addition, a heat dissipation window 16 having a length greater than or equal to twice the scan length of the sensor 8 is installed at the bottom of the sensor moving part 7 in order to minimize radiation radiating to the high temperature ladle 1.

EXAMPLE

A porous plug 2 that is actually damaged and discarded by the loss amount measuring apparatus for the plug of the porous plug according to the present invention is manufactured as shown in FIG. 4A, where the distance between the porous plug 2 and the distance sensor 8 is 8 m away. The three-dimensional results of scanning at 10 mm intervals with 14 sensors at 20 mm intervals are shown in FIG.

It was confirmed that the maximum amount of melt loss relative to the edge of the porous plug 2 was 68 mm, and the maximum amount of melt loss 17 was 67 mm in the measured shape of the porous plug 2 and measured accurately with an error of 1 mm.

As described above, by using the apparatus for measuring the amount of loss of the porous plug of the ladle according to the present invention, it is possible to stably measure the amount of melt and the shape of the melt in a ladle environment of high temperature and high dust, and stably for the porous plug. It is possible to objectize the hand measurement so that the ladle operator can be relieved when determining whether the ladle is repaired, and the operation stability and the maintenance of the ladle can be rationalized.

In addition, by building and analyzing data on the main factors of the ladle melt loss, molten steel retention time, gas bubbling time and the like, the amount of melt loss measured by the number of times of use can be used to develop a long-life porous plug.

Claims (3)

A plurality of laser distance sensors installed on the device base 6 installed on the upper part of the ladle 1 so as to correspond to the POSOS plug 2 on the lower surface of the ladle 1 and moved by the sensor moving part 7 8); A signal processor 10 electrically connected to the laser distance sensor 8 and installed on the device base 6; A monitoring system (12) of the cab (11) electrically connected to the signal processor (10); The loss amount measuring device for a forlas plug of a ladle, characterized in that the control system 13 is electrically connected to the monitoring system 12 to control the entire device. The method of claim 1, The sensor moving part 7 includes a pair of LM guides 9 installed on the device base 6, a sensor base 8a provided with the plurality of laser distance sensors 8 while being guided back and forth through the pair of LM guides 9 and The apparatus for measuring the loss amount of a forrus plug of a ladle, characterized by comprising a gas spray nozzle (15) installed in front and side thereof. The method according to claim 1 or 2, The heat dissipation window 16 having the shutter 14 capable of opening and closing the sensor moving part 7 has a length at least two times greater than the forward and backward moving distance (scan length) of the laser distance sensor 8. The loss amount measuring device for the porous plug of the ladle characterized in that the installation.