JPS6234003A - Method for measuring refractory lining profile of ceramic furnace container - Google Patents

Abstract

PURPOSE:To accurately measure the thickness of a refractory wall, by a pair of coils (sensor heads), each of which is formed by winding non-magnetic conductors and arranged symmetrically with respect to the normal line of an iron skin being a symmetric line so as to provide an interval, a moving mechanism and a measuring mechanism etc. CONSTITUTION:A drive apparatus 3 moves a sensor head 1 up and down as well as before and behind through an arm 2 and rotated the same by using the arm 2 as a shaft. Further, the apparatus 3 moves the arm 2 up and down and rotates the same and moves on a revolving bar 4. This bar 4 performs revolving motion on the rail 5 placed on the flange of a ladle through wheels 6. By this mechanism, the head 1 can move to the circumferential direction in the ladle. A high frequency power source 8 supplies a high frequency current to a transmission coil and the induced voltage generated in a receiving coil is converted to the distance H between the head 1 and an iron skin 16 by a signal processor 12. The distance (h) between the head 1 and a refractory wall 15 is separately calculated and, by the signal processing of H-h, the thickness of the wall 15 at each measuring point is calculated. At each measuring point, the up-and-down moving quantity of the arm 2 and the revolving angle of the bar 4 are detected and the position of the bar 4 is determined by signal processing.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a refractory lining for a furnace vessel, in which a conductive continuous flat or curved outer shell is lined with a non-conductive refractory. Regarding the method of measuring the profile.

(Prior art) Accurately measuring the thickness of the refractory wall of a kiln vessel requires
It is extremely important for the repair and maintenance of refractory walls. That is, by accurately measuring the thickness of the refractory wall and performing repairs according to the amount of erosion in each part, the balance of erosion in the entire container can be maintained and the refractory can be used efficiently.

Currently, there are the following methods for measuring the thickness of refractory walls. (For example, Japanese Unexamined Patent Publication No. 147510/1983) (1) Using waves such as lasers and microwaves, these waves exit from the generator, are reflected by a refractory wall, and return to the generator. The distance between the refractory wall and the generator is determined from the time it takes for the refractory to come, and the amount of erosion and the thickness of the refractory wall are calculated from the change in this distance.

(2) Specify two specific points on the container, set a reference line between these two points with a piano wire, etc., measure the distance between this reference line and the refractory wall with a ruler, etc., and Calculate loss and thickness.

As mentioned above (11, (2+), first of all, the common problem is the error caused by the deformation of the iron shell.For example, the first problem with the ladle is
If the refractory wall is deformed as shown in Figure 0, the thickness of the refractory wall will apparently become thinner in the Oa direction, but still thicker in the ob force direction. Furthermore, in methods (1) and (2), the distance between the reference point (or line) and the refractory wall is measured to determine the amount of erosion of the refractory and calculate the remaining dimension. Therefore, if the distance from the first measurement at a certain location is not known, the amount of erosion loss from the beginning to the current measurement cannot be determined, and the remaining dimensions cannot be calculated. Therefore, in these methods, the layer side portion is limited to the first measurement point, making it difficult to know the thickness of the refractory wall over a wide range.

Therefore, repairs based on accurate and wide-ranging information on the thickness of the refractory wall cannot be performed, and in the worst case, it may lead to a hot water leakage accident.

(Problems to be Solved by the Invention) An object of the present invention is to provide a method for accurately measuring the thickness of a refractory wall without having the drawbacks of the conventional measuring methods.

(Means for Solving the Problem) The refractory wall thickness measurement method of the present invention involves winding a non-magnetic conducting wire and installing the wires at symmetrical intervals with the normal line of the iron shell as the axis of symmetry. a pair of coils (hereinafter referred to as sensor heads), a mechanism that moves the sensor head so that the axis of symmetry is always perpendicular to the steel shell, and a mechanism that moves the sensor head so that the axis of symmetry is always perpendicular to the steel skin, and A mechanism that stops and measures the distance between the sensor head and the refractory wall, calculates the distance between the sensor head and the refractory wall at each measurement point from the induced voltage of the coil, and then calculates the distance between the sensor head and the refractory wall and the distance between the sensor head and the refractory wall. It consists of a calculation function that calculates the thickness of the refractory wall from the difference in distance between the two, and a display function that displays the thickness of the refractory wall at all measurement points.

(Function) The refractory wall soil is moved so that the axis of symmetry of the above sensor head is always perpendicular to the steel skin. The sensor head consists of two coils, a transmitting coil and a receiving coil. First, a high-frequency magnetic field is generated by passing a high-frequency current through a transmitting coil. This will be referred to below as the primary magnetic field. When a conductor such as a steel shell comes close to a primary magnetic field, an eddy current flows due to electromagnetic induction, and a secondary magnetic field is further formed. An induced voltage is generated in the receiving coil by the combined magnetic field of the primary and secondary magnetic fields.

The magnitude of this induced voltage changes depending on the distance between the sensor herald and the iron skin. Therefore, by determining the relationship between the two in advance as a calibration curve, it is possible to determine the distance between the sensor herald and the iron skin from the induced voltage. At the same time, the sensor head is moving or stopped at a specific measurement point to measure the distance between the sensor heradre refractory walls. Automatically calculate the thickness of the refractory wall from the difference between the distance between the sensor heradol iron skin and the distance between the sensor heradol refractory wall and display it on a printer or plotter 〇 (Example) The present invention will be implemented as follows. This will be explained with an example of a failed device.

FIG. 1 shows the case where the invention is implemented in a ladle. In FIG. 1, 1 is a sensor head, 2 is an arm, and 3 is a drive device that moves the sensor head 1 up and down and back and forth via the arm 2, and rotates the sensor head 1 about the arm 2 as a rotation axis. This drive device [3 moves the arm 2 up and down and rotates it, and also moves on the rotation bar 4. Turn 1c
! The J-bar 4 moves four times via wheels 6 on a rail 5 placed on the edge of the ladle and performs a turning movement. This pivoting movement allows the sensor head 1 to move in the same direction within the ladle. Note that the wheels 6 are rotated by a motor (not shown in the figure) attached to the rotation bar 4. The rail 5 is kept horizontal by height adjusting legs 7.

Reference numeral 8 denotes a high-frequency power source that supplies a high-frequency current to the transmitting coil of the sensor head 1 via the transmitting cable 9a. In addition, the induced and electromotive voltage generated in the receiving coil is taken out via the receiving cable 9b, and the high W! Through the J-wave amplifier 10 and the detector 11, the signal processor 12 opens the sensor heradol iron skin! Converted to H.

Further, the distance between the sensor heradre refractory walls is determined by another means, and the thickness of the refractory wall at each measurement point is determined by H-h signal processing.

The measuring point detects the vertical movement amount and the turning angle of the arm 2 (-4), and its position is similarly determined by signal processing.The measuring point and the thickness of the refractory wall at that position are displayed on the display 13. Displayed by

Sensor head direction setting device #14 will be described later.

The refractory material constituting the refractory wall 15 is a non-conductive solid such as alumina or silica, and specifically, the electrical resistance is ρ.
(μΩ theory), it is nonnρ〉14.

An example of measuring the distance between the sensor heradol and the refractory wall is described below.

FIG. 2 is an explanatory diagram showing a method of measuring the distance between the sensor head and the refractory wall by temporarily stopping the sensor head on the measurement point. At the measurement point, the sensor head temporarily stops moving in the circumferential direction or the height direction and approaches the refractory wall 15 until the tip of the heel distance setting rod 17 hits the refractory wall 15. Then, while the tip of the distance setting rod 17 is in contact with the refractory wall 15, the distance between the sensor herald and the iron skin is determined from the induced voltage generated in the receiving coil of the sensor head 1. Further, the length of the distance setting rod 17 is always maintained at a constant value with its tip touching the refractory wall 15. Therefore, the thickness of the refractory wall 15 can be determined by subtracting a certain value from the distance between the sensor heradles.

FIG. 3 is another explanatory diagram showing a method of measuring the distance between the sensor heradre refractory walls by temporarily stopping the sensor head 1 at a measurement point. A plurality of distance setting rods 17 are arranged in the longitudinal direction of the sensor head 1, and are connected to the sensor head 1 by a spring 18. Sensor head 1 in this state! When the distance setting rod 17 approaches the refractory wall 15, the tip of the distance setting rod 17 hits the refractory wall 15, and the springs 1
8 contracts and a force is generated. This force is monitored for all springs 18 and movement of the sensor head 1 is stopped when the spring 18 connected to the last distance setting rod 17 is compressed.

At this time, all the springs 18 are in a compressed state, and therefore a force is generated. This force was detected numerically and from Hooke's law the length of the rebound was 18! can be found. The maximum spring length is 18! The length of the max distance setting rod 17 is t
Then, t+Amax becomes the value closest to the distance between the sensor heradre refractory walls at the most eroded portion in the section of length L. The first method to find the distance between the sensor heradol and iron skin is
This is the same as when explaining the figure. Therefore, the value obtained by subtracting t0max from the distance between the sensor herald steel skins becomes the value closest to the thickness of the most eroded portion. In order to more accurately measure the thickness of the area most damaged by erosion, the number of distance setting rods 17 may be increased and the distance between the distance setting rods 17 may be narrowed.

FIG. 4 is an explanatory diagram showing a method of simultaneously measuring the distance between the sensor head 1 and the refractory wall while the sensor head 1 is moving. The distance setting rod 17 is attached to the center of the sensor head 1, and a spring 18 is connected thereto as in FIG. This spring 18 is also equipped with a device that detects its force when it is compressed, as in FIG. 3. Furthermore, a wheel 19 is attached to the tip of the distance setting rod 17. The wheels 19 allow the distance setting rod 17 to be moved while its tip remains in contact with the refractory wall 15. In this state, the spring 18 compresses and a force is generated. This force is detected numerically and the length of the spring 18 is determined using Hooke's law. If the length of the distance setting rod 17 is t, then t+1 becomes h.

Incline diagram 5 is another explanatory diagram showing a method of simultaneously measuring the distance between the sensor heradre refractory walls while the sensor head 1 is moving. Two waveguides 20 and 21 are attached to the center of the sensor head 1, and one emits sound waves or electromagnetic waves, and these waves reflected on the I refractory wall 15 return to the other. ing. h is determined by measuring the time from when these waves appear until they return.

Next, a method of moving the sensor head 1 so that the axis of symmetry of the sensor head 1 coincides with the normal line of the iron skin will be described.

Figure 6 shows the measurement situation of the thickness of the ladle refractory wall 15, viewed from above, and as shown in this figure, the sensor head 1
If the axis of symmetry does not match the normal line of the steel shell, the state of the magnetic field will change compared to when data for the calibration curve was taken, causing an error. Therefore, the axis of symmetry 22 of the sensor head 1 must coincide with the normal line 23 of the iron skin during measurement. In general, in the case of a ladle, deformation in the longitudinal section as shown in FIG. 7(a) is small, but deformation in the cross section as shown in FIG. 7(b) often occurs. Therefore, when the sensor head 1 is moved, the symmetry axis 22 of the sensor head 1 and the iron skin's law @23 coincide with each other, following the deformation within this cross section.
You must do so. A specific example is shown in FIG. 14a is a direction setting rod whose direction always coincides with the axis of symmetry 22 of the sensor head 1. 1, the direction setting rod 14a is electrically conductive and one end thereof is always in contact with the upper surface of the rotary disk 14b. The rotary disk 14b is a non-conductor, but the narrow linear band 14c on the upper surface of the rotary disk 14b and the rotating shaft 14d are conductive. The band portion 14 c and the rotating shaft 14 d are electrically connected, and each time the band portion 14 c makes one rotation, it comes into contact with one end of the direction setting rod 14 a, and at this time, the band portion 14 c
Current flows from the direction setting rod 14a to the direction setting rod 14a. FIG. 9(a) is a diagram of the state before measurement, viewed from directly above, and at this time, the band portion 14c.

Adjust so that the direction setting rod 14a and the normal line of the iron skin are in the same direction. From this state, start measurement and
If the sensor head 1 moves at a constant speed, the rotary plate 14b
The rotational speed of is also constant, and the band portion 14c always returns to its original position at the same time. Therefore, if the direction setting rod is deviated from the position of (a) as shown in FIG. 9(b), the band 1
4. Time for c to reach the position shown in Fig. 10(a) and band portion 14
A difference occurs between the time when c contacts the direction setting rod 14a and the current flows. By detecting this time shift and correcting the direction of the direction setting rod 14a so that it becomes zero, the sensor head 1 can be adjusted so that the axis of symmetry 22 of the sensor head 1 coincides with the normal line 23 of the iron skin. It can be moved.

A wheel 14e is attached to the lower end of the rotating shaft, and a rotating shaft fixing base 14f holds the rotating shaft so that the wheel 14e always rolls on the side surface of the ladle.

(Effects of the Invention) In the present invention, the thickness of the refractory wall can be measured at any position within the furnace container without being affected by shell deformation.

Therefore, the lining profile can be determined over a wide range with high precision, making it possible to perform effective repairs that maintain the balance of erosion and loss in each part. This makes it possible to use the furnace container until each part reaches its melting limit without any part of the refractory walls limiting the lifespan, thereby achieving an extension of life and a reduction in unit consumption.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional explanatory diagram of a measuring device for implementing the present invention, Fig. 2 is a cross-sectional explanatory diagram showing a method for setting the distance between the sensor head and the refractory wall, and Fig. 3 is the distance between the sensor head and the refractory wall. An explanatory diagram showing another example of the setting method, Figures 4 and 5 are explanatory diagrams showing further examples, and Figure 6 is a state in which the axis of symmetry of the sensor head does not match the normal line of the iron skin. Figure 7 (a) and (b) are cross-sectional diagrams showing the deformation of the steel shell, and Figure 8 is the symmetry 41 of the sensor head.
A perspective explanatory view of a sensor head direction setting device that moves the sensor head so that j1 and the normal line of the iron skin coincide;
Figure 9 (a) is an explanatory diagram showing the state in which the direction setting rod and the band are aligned with the normal line of the steel shell before measurement, and Figure 9 (b) is an explanatory diagram showing the state in which the direction setting rod and the band are aligned with the normal line of the steel shell. An explanatory diagram showing a state where the
FIG. 10 is an explanatory diagram showing an example of the shape of the ladle shell before and after deformation. l is the sensor head, 2 is the arm, 3 is the drive device, 4 is the turning bar, 5 is the rail, 6 is the wheel, 7 is the height adjustable leg, 8
is a high frequency power supply, 9a is a cable for transmitting waves, 9b is a cable for receiving waves, 10 is a high frequency amplifier, 11 is a detector, 12 is a signal processor, 13 is a display, 14 is a sensor head direction setting device, 14a is a Direction setting rod, 14b is a rotary disk, 14
c is a belt, 14 d is a rotating shaft, 14 e is a wheel, 14
f is a rotating shaft fixing base, 15 is a refractory wall, 16 is a ladle shell, 17 is a distance setting rod, 18 is a spring, 19 is a wheel, 20
, 21 is the waveguide, 22 is the symmetry axis of the sensor head, 23
is the normal of the iron skin. Patent Applicant Nippon Steel Corporation Yakokuniya e) Figure

Claims (1)

[Claims] A pair of coils is made up of a conductive continuous flat or curved outer shell with a non-magnetic conducting wire wound around the inner surface of a wall lined with a non-conductive solid. When determining the wall thickness from the induced voltage in the other coil when an alternating current voltage is applied to one coil, two The axis of symmetry of the coil is always perpendicular to the outer shell, and the distance between the coil and the wall is measured while moving or at a specific measurement point, and then the distance between the coil and the wall is measured using the induced voltage in the coil. A method for measuring the refractory lining profile of a kiln furnace vessel, characterized in that the thickness of the wall is determined by subtracting the distance between the coil and the wall from the distance between the outer shells.