JPH0648139B2 - Repair method for liner container for molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a container for molten metal in which a non-conductive refractory is lined inside a conductive and continuous flat, curved or spherical outer shell. It is related to the repair method of.

[Prior Art] As a method for repairing a container for molten metal, for example, a refractory material is generally sprayed together with a binder or the like for repair. The amount of spray and the sprayed area are very ambiguous, and in order to perform accurate repairs, the thickness of the residual brick should be measured automatically and the melted location and the melted loss should be accurately identified. is necessary.

As a method for automatically measuring the thickness of the residual brick, JP-A-51-147
Utilizing waves such as lasers and microwaves as shown in 510, these waves leave the generator and are reflected by the refractory wall, and from the time until they return to the generator, There is a method of calculating the distance of the generator and calculating the melting point and the amount of melting and the thickness of the refractory wall from the change in this distance, but with this method the amount of deformation of the iron shell during use is unknown, It is not possible to correct it, and when it is combined with a repair device such as a spraying machine, the influence of dust flying in the container causes a large error, so it is not used in combination with the repair device. Absent.

[Problems to be Solved by the Invention] First, the problems of the above-mentioned conventional techniques include an error due to deformation of the metal container. Secondly, the distance between the refractory wall and the generator must be calculated before and after the melting damage because the generator such as laser is at the same position before and after the melting damage. However, it is difficult to know the thickness of the refractory in a wide range.

Further, in the conventional technique, no technique has been found for measuring the thickness of the furnace wall of the molten metal container and finding the melted point based on the measured value, and repairing it with a normal automatic repair device. In the method, if there is unevenness before repairing, the construction body also has unevenness, which is uneconomical in terms of the basic unit of repair material.

Furthermore, if the repair method is a manual adjustment by visually confirming the melted point, the difference between a skilled worker and an unskilled worker clearly appears in the finished state, and it cannot be expected as an established repair method.

The problem to be solved by the present invention is to solve the problems of these conventional techniques.

[Means for Solving the Problems] The repairing method according to the present invention is performed using an apparatus having the following three functions.

(1) Refractory thickness measurement function (2) Melting area analysis function (3) Refractory repair function (1): Non-magnetic conductor wire is wound and symmetrical with the normal of the skin as the axis of symmetry. 2 pieces 1 spaced apart
A pair of coils (hereinafter referred to as sensor head), a function to move the sensor head so that the axis of symmetry is always within ± 10 ° with respect to the iron skin normal, the sensor head is moving, or a specific measurement point A mechanism to stop at and measure the distance between the sensor head and the refractory wall, the distance between the sensor head and the iron skin at each measurement point is determined from the induced voltage of the coil,
This, sensor head-distance between iron skin and sensor head-
It has a calculation function to obtain the thickness of the refractory wall from the difference in the refractory distance.

Regarding (2), based on the data obtained in (1), the erosion point,
It has a function of determining the amount of melt loss, determining the melt loss rate from the number of times of use after the previous repair, determining the amount of refractory to be repaired for each part, and then feeding it back to the repair device.

Regarding (3), based on the data obtained in (2), the blowing lance etc. is accurately moved to the melting point, and the powder spraying material supply amount,
It has the function of controlling the supply speed, nozzle movement speed, spraying time, spraying frequency, etc., and repairing the target container with an appropriate amount of refractory material.

That is, the repair method according to the present invention is as follows.

A refractory of fixed or irregular shape is lined in a container composed of a conductive, continuous flat, curved, and spherical outer shell.
In the method of repairing a liner container for molten metal, the distance from any space point in the container to the outer shell and the value obtained by automatically measuring the distance from the space point to the surface of the refractory lining, the liner After calculating the residual thickness of the refractory, automatically calculating the residual thickness distribution in the lining container, automatically calculating the melting rate of each part, and then spraying the material until the set residual thickness according to each melting rate is reached. A method for repairing a liner container for molten metal, which comprises automatically controlling the amount of supply per unit time, the supply pressure, the nozzle moving speed, the spraying time, and the number of times of spraying.

[Operation] The arm with the sensor head and the blowing lance attached to the tip is attached to the drive device that moves up, down, traverse, and rotate independently, and the axis of symmetry of the sensor head is within ± 10 ° with the normal to the skin. So move along the refractory wall.

The sensor head uses the sensor disclosed in Japanese Patent Laid-Open No. 62-34003 filed by one of the applicants. The head consists of two coils, namely a transmitting coil and a receiving coil. When a high-frequency current is passed through the transmitting coil, a high-frequency magnetic field (primary magnetic field) is generated, and a secondary magnetic field due to an eddy current flows through the target conductor. An induced voltage is generated in the receiving coil by the combined magnetic field of the primary and secondary magnetic fields, but this induced voltage changes to the distance between the sensor head and the iron skin, so the distance between the sensor head and the iron skin can be obtained from this voltage. At the same time, the thickness of the refractory is determined by determining the distance between the sensor head and the refractory and taking the difference between the two values. The inner wall surface of the container for this measurement,
The profile of the refractory thickness is instantly clarified by automatically performing the whole area or a part thereof and calculating it by the computer. From this data, the amount of melt damage and the melt damage point are clarified, and the melt damage rate of each position is also known by inputting the number of times of use. An appropriate refractory thickness can be sprayed and repaired by calculating and feeding back the result to the driving device and the powder supply device and repairing while controlling the spraying amount. These automatic calculations,
Since the control is performed by the computer, the calculation time is short, and it is possible to perform the repair work while performing the measurement operation.

In the present invention, any conventional method may be used as the repair means.Specifically, dry spray repair, wet spray repair, thermal spray repair, etc. are considered, and these repair devices and the sensor are the same. The effect is further enhanced by mounting it on the stand. The repairing means depending on the amount of melt damage at the time of repair is to change the discharge amount and discharge pressure of the sprayed material (including the liquid to be added, gas, etc.) per hour.
The relative moving speed of the surface to be repaired and the spray machine nozzle is changed.
Means such as changing the spraying time and spraying recovery can be considered, but the numerical analysis data of the furnace wall thickness obtained from the sensor is displayed numerically on the control panel, and as a result, it can be adjusted arbitrarily by the above means. It is possible to carry out repairs according to the amount of melting loss, and further, in the control panel to which the above-mentioned data is input, the program for executing the repairing means has a program to perform melting damage of the furnace wall at each location of the molten metal container. This can be done by inputting the amount and controlling each repairing means.

Needless to say, it is possible to control by inputting the furnace wall temperature, atmosphere temperature, etc. at the time of repair to the program, but as a furnace wall temperature measuring means, a thermocouple is used as a distance setting rod for measuring between the sensor and the furnace wall surface. There is also a method of measuring with various functions.

As the above-mentioned repair means, the repair about filling the hollow furnace wall surface due to so-called melting damage such as spray repair with the repair material was explained, but as a means for repairing the convex portion of the furnace wall surface, an air hammer type cutting machine It is also possible to scrape off the convex portion confirmed by the same sensor by using such as. That is, by controlling a device combining a cutting machine and a spraying device depending on the thickness of an arbitrary portion of the furnace wall obtained by the above-mentioned sensor, the furnace wall thickness is uniform and good construction is achieved. It can be expected to produce a perfect molten metal container.

[Example] The present invention will be described in detail below based on an example thereof.
FIG. 1 shows a configuration example of a repair device used in the method of the present invention.

In FIG. 1, 1 is a distance measuring rod for detecting the distance between the sensor and the refractory, 2 is a sensor head, 3 is a sensor head 2
Sensor box with a built-in working transformer with the distance measuring rod 1 attached, 4 is an arm, 5
Is a traverse frame which moves the sensor head in the radial direction of the pan via an arm, and is driven by a traverse motor 8 through screws. Reference numeral 6 denotes an elevating post for moving the arm up and down, which is driven by a rack and pinion through a speed reducer by the elevating motor 9 described above. Numeral 7 is a turning deck for rotating the arm, which is driven by a turning motor 10 and a pin gear through a reduction gear. Reference numeral 11 is a swiveling cable bear, which is a signal and power cable bear for processing the signal and power cables and the cooling air hose.

12 is a spray nozzle, 13 is a spray pipe, 14 is a refractory and spray water supply hose, and 15 is a swivel that supplies the refractory and spray water to the hose rotating on the swivel deck. On the 22 decks, 19 water tanks and compressors (not shown), dryers, valve stands, etc. will be installed. 23 is a pillar of the deck, 24 is a wheel, 25
Is a rail for traveling. Each drive has 26 control panels, and
It is controlled by 27 control panels. Reference numeral 28 is a numerical analysis device for calculating the thickness of the refractory, calculating the amount of melting loss, and calculating the appropriate value of the amount of sprayed refractory. FIG. 4 is a schematic block diagram of the control device.

[Example of repair method] In Fig. 1, when the molten metal container carried by a traverser or the like is set under the pedestal, the arm 4 having the sensor box 3 connected to the tip of the container comes down into the container. The brick thickness was measured while moving on the furnace wall. Regarding the method of measuring the brick thickness at this time, the distance from the sensor head to the iron skin is measured by the sensor 2, and the distance from the sensor head to the brick surface is measured by the distance measuring rod 1 with an operating transformer connected inside, and the data is obtained. Numerical analysis device 28
Sent to (computer). The numerical analysis device (28) calculated the brick thickness from both data and found the brick thickness distribution on the container wall. Then, the melt loss rate at each location is determined from the number of times of use, and for locations where the melt loss rate is high, the location is fed back to the control panel to increase the refractory thickness, and the spray nozzle 4 is set at that location. After moving, spray repair was performed.

In the repairing device used in the method of the present invention, the action and effect of the sensor part and the repairing part, which are the main constituents of the repairing device, differ depending on how the driving means is used. That is,
As shown in FIG. 2A, the sensor drive unit and the repair unit drive unit are provided independently of each other, so that the measurement and the repair can be simultaneously performed by independent operations. Therefore, the measurement and repair can be performed by using the container moving device. It can be carried out continuously or simultaneously. As shown in FIG. 2B, the sensor unit and the repair unit are mounted on the same frame having a turning function, and the sensor unit lifting device and the repair unit lifting device are independently provided, so that the measured data is directly repaired. It is effective for the purpose of automatic repair to input as the data of. As shown in FIG. 2C, by having a turning device and an elevating device on a gantry having a sensor part and a repair part mounted thereon, it is effective for automatic repair as in the case of B, and the number of drive parts can be reduced. At the time of measurement and repair, the sensor and the nozzle are always present in the pot at the same time, so it is important to take measures against dust from the sensor.

FIG. 3 shows an example of a method of measuring the refractory thickness of the ladle while moving the sensor head, and shows an example of the movement pattern of the sensor when seen in the ladle cross section. Six points (Z _{10 to} Z ₆₀ ) are provided as reference points in the height direction of the wall sidewall,
When the start point and end point are selected on the control panel surface and the number of divisions to be measured is set, the sensor starts from the origin or an arbitrary position and sequentially measures from the start point to the end point. Since the measured data are displayed on 28 numerical analysis devices, select the points that have a large amount of melting loss and require repair. When the start point and the end point are newly set as the spraying point, the spraying nozzle starts from the origin or an arbitrary position and sequentially sprays from the start point to the end point.

〔The invention's effect〕

An advantage of the present invention is to provide a method and an apparatus for directly finding the thicknesses of the furnace wall and the bottom of a container for molten metal, which has not been hitherto available, and performing repair according to the actual amount of melting loss. In other words, the unevenness of the furnace wall that was melted by performing it,
After repairing, a container for molten metal with a uniform furnace wall thickness is completed,
Moreover, since the amount of repair material is used according to the appropriate location,
It is economical in terms of the original unit price of repair material.

A comparison of the results using the method according to the invention and the prior art is shown in Tables 1 and 2.

Table 1 is data of spraying effect, and Table 2 is data of ladle lining end point determination. In any case, it is clear that the case of the present invention is superior.

Further, according to the conventional method of visually confirming the melting point and repairing it, a skilled worker is required for the work because the thickness of the furnace wall cannot be quantitatively confirmed, but according to the present invention,
Even a person with little work experience can easily and effectively repair the melted portion, and the repair operation and inspection operation can be performed by one person, which is also effective in saving labor.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of a repair device used in the method of the present invention, and FIG. 2 is an arrangement example of a sensor drive device and a repair part drive device in the repair device used in the method of the present invention. Partial cross-sectional side view shown, FIG. 3 is a side cross-sectional explanatory view showing an example of the movement pattern of the sensor in the ladle when targeting the ladle, and FIG. 4 is the sensor and repair device used in the method of the present invention. FIG. 3 is a schematic block diagram of an example control device for controlling operation. 1 ... Distance setting rod, 2 ... Sensor head, 3 ... Sensor box, 4 ... Arm, 5 ... Traverse frame, 6
...... Lifting post, 7 ...... Turning table, 8 ...... AC for traverse
Servo motor, 9 ... Servo motor for lifting and lowering, 10 ...
Servo motor for turning, 11 …… Cable bear, 12 …… Spraying nozzle, 13 …… Spraying pipe, 14 …… Refractory and spraying water supply hose, 15 …… Swivel, 16 …… Hoist for container, 17 …… Container , 18 …… braider, 19 …… water tank, 20 …… refractory wall, 21 …… ladle iron shell (outer shell), 22 ……
Deck, 23 ... Supports, 24 ... Wheels, 25 ... Rails, 26 ...
… Operation panel, 27 …… Control panel, 28 …… Numerical analysis device, 29 ……
Numerical analysis PC, 30 …… Programmable controller, 31 …… Servo controller lifting axis, 32 …… Servo controller traverse axis, 33 …… Servo controller turning axis, 34 …… Servo controller material cutting, 35,36,3
7,38 …… Servo motor, 39,40,41,42 …… Encoder, 43 …… Sensor, 44 …… Differential transformer, 45,46 ……
amplifier.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoto Kasai 1-1-1 Edamitsu, Hachimanto-ku, Kitakyushu City, Fukuoka Prefecture Inside the Engineering Department, Nippon Steel Corporation (72) Inventor Shigemi Harada Oita City, Oita Prefecture Nishinosu No. 1 Nippon Steel Co., Ltd. Oita Works Co., Ltd. (72) Inventor Masayuki Fujita 1-1 Higashihamamachi, Hachiman Nishi-ku, Kitakyushu, Fukuoka Prefecture Kurosaki Ceramics Co., Ltd. (72) Inventor Hitoshi Ozawa Yawata-nishi, Kitakyushu, Fukuoka 1-1 Higashihamamachi Kurosaki Ceramics Co., Ltd. (72) Inventor Hiroaki Hayashi 1-1 Higashihamamachi, Hachimansai-ku, Kitakyushu, Fukuoka Prefecture 72 Kurosaki Ceramics Co., Ltd. (72) Seiji Aso Oita-shi, Oita 1 Nishinosu Nippon Steel Co., Ltd. Oita Steel Works (56) References JP 62-34003 (JP, A) JP 60-29585 (JP, A) JP 61-178200 (J) , U)

Claims (1)

[Claims] 1. A method for repairing a liner container for molten metal, comprising a refractory material having a fixed or irregular shape lined in a container made of an electrically conductive and continuous flat, curved or spherical shell.
Calculate the remaining thickness of the lining refractory from the value obtained by automatically measuring the distance from the arbitrary space point in the container to the outer shell and the distance from the space point to the surface of the lining refractory, After automatically calculating the residual thickness distribution in the container and automatically calculating the melt loss rate of each part, the amount of sprayed material supplied per hour, supply pressure, nozzle until the set residual thickness according to each melt loss rate is reached. A method for repairing a liner container for molten metal, which comprises automatically controlling by controlling a moving speed, a spraying time, and a spraying frequency.