JPH11323589A - Method for calibrating magnetic sensor used for detection of abnormal electrode in electrolytic smelting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for calibrating magnetic sensors used for detecting an abnormal electrode which correctly executes the detection of the abnormal electrode by executing span adjustment by using standard magnetism of which the magnitude of the magnetism is exactly known. SOLUTION: This method for calibrating the magnetic sensors specifies and detects the abnormal position of electrode plates by alternately immersing many cathode plates K and anode plates A in an electrolytic cell 30 in which an electrolyte is stored, respectively in the state of conductively supporting these plates and simultaneously measuring the magnetism near the contacts of conductors and the plural cathode plates and/or near the contacts of the conductors and the plural anode plates by the many magnetic sensors 13. In such a case, the magnetic sensors capable of making stable measurement are used as the sensors for measuring the magnetism and at the time of their use, the magnetism measurement is first carried out in a place where the magnetism of the electrolytic cell is not detected. Zero adjustment is then carried out and thereafter the standard permanent magnet of which the magnitude of magnetic force is known is brought near to the magnetic sensor. The sensor is then so weighted and corrected that the read value thereof attains the magnitude of the known magnetism of the standard permanent magnet. The weighting and correction are carried out with all the magnetic sensors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for calibrating a large number of magnetic sensors used for detecting abnormal electrodes in electrolytic smelting,
In particular, the present invention relates to a method for calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting, in which a calibration operation can be performed by an operator simply and in a short time.

[0002]

2. Description of the Related Art First, an outline of an electrolytic smelting facility will be described (see FIG. 11). The electrolytic cell 30 is a rectangular parallelepiped tank opened upward, and a common conductor 32 (bus bar) is provided on the upper surface of the long side wall 30c. The electrolyzer 30 is shown in FIG.
As shown best at 0, they are installed adjacent to each other in the vertical and horizontal directions, the total number of which is several hundred tanks. The electrolytic solution of each electrolytic cell 30 includes a plurality (typically, about 20 to 50 sheets) of cathode seed plates (cathode plates) in the case of Cu.
K is immersed in such a manner that the anodes A (anode plate) A are alternately parallel to each other. Each cathode plate K is suspended from a cathode support rod (crossbar) 34. Both ends of the crossbar 34 and the ears of the anode plate A are supported by a common conductor 32 provided on the upper surface of one of the left and right electrolytic cell side walls 30c and the other electrolytic cell side wall 30c.

In the Walker-type current supply system shown in FIG. 10, a total of four electrolytic cells 30 each having two rows and columns are used as a set so that current flows from all anode plates A to all cathode plates K of each electrolytic cell 30. It is wired to. As a power source for electrolytic smelting, a low voltage, a large current is required, and a large capacity voltage can be adjusted according to the conditions of the electrolytic operation while having a large capacity, so a thyristor type or diode type semiconductor rectifier is used. Can be

Factors that hinder normal operation in such electrolytic smelting include generation of dendrites and bumps on the cathode surface, curvature of the cathode, and bridging by large anode fragments. For example, if bumps are locally generated on the cathode surface and become enlarged, the anode plate A and the cathode plate K are short-circuited (short-circuit), and the electrolytic current is concentrated on the short-circuited portion. (See FIGS. 5A and 5B). In order to detect such abnormalities, a tank inspection operation is performed by operating a movable iron magnet magnet while walking on thousands to tens of thousands of electrolytic cells every day. However, since the number of inspection locations is enormous as described above, a great deal of labor is required, and this also causes a positional shift of the electrode plate due to a worker walking on the electrolytic cell.

[0005]

As a method for finding these abnormalities, there are a method for measuring an electric current flowing through a cathode supporting rod (crossbar) and an ear of an anode, and a method for detecting the abnormalities. There is a method of measuring an abnormality by using an infrared sensor, paying attention to the fact that is locally increased. However, in the former method, it is difficult to directly measure and monitor the fluctuation of the current itself in terms of accuracy. Further, in the latter method, accurate detection is difficult to be performed from above the heat retaining sheet, and it takes time until the temperature of the short-circuit portion becomes high, so that it cannot be detected early. In addition, there is a problem that it is not possible to detect an abnormality in which no current flows through the electrode plate (poor contact, passivation).

Accordingly, the present applicant has developed a method for simultaneously measuring the magnetism near the contact point between the conductor and the plurality of cathode plates and / or near the contact point between the conductor and the plurality of anode plates with a large number of Hall element type magnetic sensors. And filed a patent application (Japanese Patent Application No. 9-65376).
issue). However, this is disadvantageous in that the equipment investment is extremely high because the sensor is manufactured by special order. Further, when the abnormal position is directly determined based on the measured value of each magnetic sensor, for example, a non-abnormal one is determined to be abnormal due to a change in the measured value due to a difference in current (voltage) between daytime and nighttime. On the other hand, there is a disadvantage that the determination is made, and conversely, the value is determined to be a normal value even though there is an abnormality.

Further, in order to accurately measure the magnetism in each part, the output is set to zero when there is no magnetism (zero adjustment), and the current flows normally (the current value is also known). That is, it is necessary to measure magnetism in the electrolytic cell 30 having no abnormality such as a short circuit, and adjust (span adjust) the amplifier so that the output value becomes a set value. Such “zero adjustment” operation is performed for all the magnetic sensors in a place where the magnetism of the electrolytic cell 30 is not detected, and then the span adjustment is performed again for all the magnetic sensors on the electrolytic cell 30 having no abnormality. However, even in the case where no abnormality can be found in appearance, the current value of the part to be magnetized is slightly different for each part for various reasons, and therefore, the amount of magnetism is also slightly different. In the above-described conventional calibration method, it is not possible to ensure complete accuracy because the span adjustment is performed on the assumption that this is constant. In addition, an operator who works to bring each magnetic sensor close to a predetermined part of the electrolytic cell 30 and a computer in a control room installed separately from the place where the electrolytic cell 30 is installed are used for such work. There was a drawback that two people were required to be used. Since the adjusting operation is a joint operation performed by two workers, if the number of magnetic sensors is large, the adjusting operation takes a long time, for example, 56 times.
It has also been pointed out that it takes more than two hours to adjust the magnetic sensor.

In view of the above, the present invention provides a method of detecting an abnormal electrode in which span adjustment is performed using a standard magnet having a precisely known magnetic magnitude, whereby abnormal electrodes can be detected correctly. It is an object of the present invention to provide a method for calibrating a magnetic sensor used for a computer. Another object of the present invention is to provide a method of calibrating a magnetic sensor used for detecting an abnormal electrode in which a single operator can easily and quickly perform zero adjustment and span adjustment of many magnetic sensors. .

[0009]

In order to solve the above-mentioned problems, the present invention according to claim 1 is characterized in that an electrolytic solution containing an electrolytic solution is fixed to the upper surface of both opposite side walls of the electrolytic solution. A cathode plate on the cathode side of the conductor and an anode plate on the anode side are alternately immersed in a conductively supported state, respectively, in the vicinity of the contact between the conductor and the plurality of cathode plates and / or the conductor and the plurality of anodes. A method of calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting, in which an abnormal position of an electrode plate is specified and detected by simultaneously measuring the magnetism near a contact point with a plate with a large number of magnetic sensors. As a sensor to measure, a magnetic sensor capable of stably measuring magnetism is used, and at the time of use, first, perform a magnetic measurement in a place where the magnetism of the electrolytic cell is not detected and perform zero adjustment. I know the standard A method of electrolytic smelting, comprising: bringing a magnet close to the magnetic sensor, correcting the weight so that the reading value becomes a known magnetic magnitude of the standard permanent magnet, and performing this for all the magnetic sensors. Provided is a method for calibrating a magnetic sensor used for detecting an abnormal electrode.

[0010] The magnetism is measured and zero-adjusted in a place where the magnetism of the electrolytic cell is not detected, and then a standard permanent magnet is brought close to the magnetic sensor so that the reading is the same as the known magnetism of the standard permanent magnet. Modify the weighting so that Since the magnitude of the magnetic force of the standard permanent magnet is accurately known, the span can be adjusted accurately.

According to a second aspect of the present invention, there is provided a magnetic sensor calibration method for detecting an abnormal electrode in electrolytic smelting according to the first aspect, wherein zero adjustment and weight correction are performed. The present invention is characterized in that the number of a magnetic sensor is input to a computer electrically connected to a large number of magnetic sensors via a hand-held calibrator and executed. Zero adjustment and weight correction are performed by entering the number of the magnetic sensor through the hand-held calibrator, so that only one worker is required and the work can be performed in a short time because there is no cooperative work with other workers. it can.

According to a third aspect of the present invention, there is provided a method for calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting according to the first or second aspect. If the weighting correction results in a reading of the standard permanent magnet from the magnetic sensor that matches the known magnitude of the standard permanent magnet, an indication indicating the completion of the correction,
If the values do not match even after the correction has been performed a predetermined number of times, a display indicating that the correction has not been completed is provided.
By providing the calibrator with an indication of whether or not the correction has been correctly performed, the operator can quickly know the end of the calibration, and the working efficiency is dramatically improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for calibrating a magnetic sensor used for detecting an abnormal electrode according to the present invention will be described in detail based on the illustrated preferred embodiment. FIG. 1 is a schematic perspective view showing an embodiment of a system for detecting an abnormal electrode in electrolytic smelting. A large number of arranged electrolytic vessels 30 for refining Cu are vessels for storing an electrolytic solution such as dilute sulfuric acid.
The whole is frame-fixed and placed on the floor so as not to rattle with the plurality of legs 35. In each electrolytic cell 30, an anode plate A as an anode electrode and a cathode plate K as a cathode electrode are alternately supported and arranged in parallel. The positioning means 20 is attached to the upper side of the electrolytic cell 30.

The overhead traveling crane 18 has a suspension member 1
6, hanging device 15, position guiding means 10, positioning means 2
The magnetic sensor mounting frame 15d and the stopping device 25 are mounted below the hanging device 15 (see FIG. 2). The overhead moving crane 18
Vertical direction X or horizontal direction Y of a plurality of electrolytic cells 30 arranged in parallel
(In FIG. 1, a plurality of electrolytic cells 3 are continuously provided only in the horizontal direction Y.
0), and the rail 18b
It has a slide body 18c that moves upward in the X-axis direction, and a motor 18a is installed on the slide body 18c. The rail 18b is laid in a frame (not shown), and the frame moves in the Y-axis direction. A pair of first cylindrical guide members 18d is attached to the lower surface of the slide body 18c, and a suspension member 16 that can be raised and lowered by a first wire 16b is suspended.

On the upper surface of the suspension member 16, a pair of first guide rods 16a are inserted inside the first cylindrical guide member 18d in a nested manner so as not to rattle. This is because when the overhead moving crane 18 is moved horizontally,
This is to prevent the suspended member 16 suspended by the inertial force from swinging. On the lower surface of the suspension member 16, a pair of cylindrical second cylindrical guide members 16d whose lower ends are flared are attached, and the hanging device 15 is moved by a hoist (not shown). It is suspended so as to be able to move up and down by a second wire 15b attached so as to be able to take up and unwind. The second wire 15b can be individually operated by a plurality of hoists, or can be operated by one hoist using a power transmission mechanism such as a chain. In this embodiment, the suspension member 16 is interposed between the overhead moving crane 18 and the hanging device 15 in order to move the hanging device 15 while avoiding obstacles on the electrolytic cell 30. Of course, the present invention is not limited to this.
May be attached.

A pair of second guide rods 15a are mounted on the upper surface of the hanger device 15 by being nested inside a second cylindrical guide member 16d. This is to prevent the swinging of the hanging device 15 when the overhead moving crane 18 is horizontally moved as described above. This second
Immediately after the position guide means 10 starts engaging with the positioning means 20 by the descent after the hanging device 15 has moved to the predetermined position in the horizontal direction,
The cylindrical guide member 16d is located at a flared portion of the cylindrical guide member 16d. Until the engagement between the position guiding means 10 and the positioning means 20 is completed, the upper end of the second guide rod 15a is connected to the second cylindrical guide member 16d.
It can move inside the part expanded in the shape of a flare. Position guide means 10 for engaging with positioning means 20 provided on the upper side surface of the electrolytic cell 30 is attached to both side surfaces of the hanging device 15 (not shown in FIG. 2).

A mounting shaft 15c is mounted on the lower surface of the hanging device 15 in the longitudinal direction (X-axis direction), and the magnetic sensor mounting frame 15d swings around the mounting shaft 15c and slightly extends in the longitudinal direction. It is mounted so that it can move linearly. In order to measure the magnetism on the cathode K side or the anode A side at a time, a plurality of magnetic sensors 13 are installed on the magnetic sensor mounting frame 15d.
Here, as shown in FIGS. 2 and 3, both ends of the cathode support rod 34 and the anode plate A
Of the common conductor 32 provided on the upper surface of one of the left and right electrolytic cell side walls 30c and the other electrolytic cell side wall 30c.
This is because it is necessary to measure the location where the magnetic flux of the cathode K is measured and the location where the magnetic flux of the anode A is measured at the electrolysis tank side wall 30c at the opposing position.

Although it is possible to attach a sensor for measuring the magnetic flux of the cathode K and a sensor for measuring the magnetic flux of the anode A to the hanging device 15, respectively, the number of magnetic sensors 13 to be installed is doubled and the cost is increased. At the same time, the weight increases, which is not preferable. Therefore, a mounting shaft 15c that can swing in the X-axis direction is provided, and a magnetic sensor mounting frame 15d is mounted on the mounting shaft 15c.
And the same number of magnetic sensors 13 as the number of cathodes K
Are arranged, and these are swung so that the cathode K and the anode A
Are separately measured.

However, since the position where the cathode K and the anode A are supported by the common conductor 32 is displaced by about 5 cm in the X-axis direction, for example, after measuring the cathode K side,
Simply oscillating the magnetic sensor 13 makes the magnetic sensor 13
Is not brought close to the measurement position on the anode A side. Therefore, X
A linear movement guide mechanism is provided on the magnetic sensor mounting frame 15d so as to enable movement in the axial direction. Each magnetic sensor 13 is attached to the tip of a Teflon round bar. This is to avoid damage to the magnetic sensor 13 by bending the Teflon round bar in the event that the magnetic sensor 13 comes in contact with the cathode support rod 34, the electrolytic cell side wall 30c, or the like and runs up. . Further, each magnetic sensor 13 has a cathode plate K and / or an anode plate A.
Is required to be accurately arranged at a predetermined position near the magnetic sensor mounting frame 15d, so that the mounting position on the magnetic sensor mounting frame 15d can be adjusted by a fine movement screw. In this embodiment, as many magnetic sensors 13 as the number of the cathode plates K are provided.

As the magnetic sensor 13, a flux gate type magnetic sensor which can be obtained at a low cost and can stably measure magnetism as shown in FIG. 7 is used. Although this fluxgate magnetometer has not been used for detecting an abnormal electrode in electrolytic smelting, there is an advantage that the signal processing of the element is simple and the price is low because it is a general-purpose type. The flux gate type magnetic sensor can be used, for example, in the case where a heat retaining sheet (not shown) is hung on the electrolytic cell 30 in the vicinity of the ear of the anode plate A and / or the cathode K. This has the advantage that the magnetism in the vicinity of the cathode support rod 34 for suspending and supporting the magnet can be reliably measured.

The flux gate type magnetic sensor has a configuration as shown in FIG. 8, but such a configuration is well known in the art, and a detailed description thereof will be omitted. However, as a power source used on the pulse oscillation side, a battery installed independently of a driving source such as an overhead moving crane 18 or the like is used so that each magnetic sensor 13 can perform stable magnetic measurement. It is preferable to apply. Thereby, it is possible to avoid a measurement error due to an output fluctuation due to turning on / off of the driving power supply of the magnetic sensor 13. Furthermore, the battery can be configured to be switched between two systems and used continuously by charging the battery not used. Each magnetic sensor 13
Before use, according to the calibration method of the present invention, first, the magnetism is measured at a place where the magnetism of the electrolytic cell 30 is not detected, and zero adjustment is performed. Thereafter, a standard permanent magnet whose magnetic force is known is brought close to the magnetic sensor 13 and the weight is corrected so that the reading value becomes the known magnetic intensity of the standard permanent magnet. Is performed for the magnetic sensor of. Such an operation is performed once every three days by the operator using the computer 50 via the calibrator 40 held by the operator, and sequentially executes the zero adjustment and the span calibration for all the magnetic sensors 13.

FIG. 9 is a front view of one embodiment showing the arrangement of such a calibrator and related equipment. The calibrator 40
It is connected to the data processing device 11 fixed on the upper surface of the hanging device 15 via a flexible electric wire 42. The calibrator 40 includes a numeric keypad 40a for inputting the number of the magnetic sensor 13 to be adjusted, and a
And a liquid crystal display 40b for displaying the correction number, correction completion and correction not-completed, and a switch 4 for selecting zero adjustment.
0c and switch 40d for selecting span adjustment
And an adjustment start switch 40e. In the calibrator 40, when the span cannot be adjusted even after performing a plurality of correction operations, for example, when the operator has to check the magnetic sensor 13 such as when the magnetic sensor 13 has failed, N to let you know
A G lamp 40f may be provided. Of course, various displays other than the above-described information can be performed on the liquid crystal display 40b.

In the computer 50 installed in the control room separated from the place where the electrolytic cell 30 is installed, the data processing device 1 fixed on the upper surface of the hanging device 15
In step 1, the A / D-converted measured value is compared with a set value 50a stored in the computer, and if not, the weighting 50b is modified to match the two. Regarding the conversion formula used for correcting the weight 50b,
Conventionally known various conversion formulas can be used. If the two do not match after a predetermined number of corrections, for example, three times, an NG signal is returned to the calibrator 40.

A stop device 25 is attached to the magnetic sensor attachment frame 15d attached to the lower part of the hanging device 15. The stopping device 25 is, as a rule, a locking member 2.
5a, stopper 25b, disk 26, detector 27, deceleration sensor 29a, stop sensor 29b, emergency stop sensor 29c
Is configured. The locking member 25a is slidably attached to two locations substantially at both ends in the longitudinal direction of the magnetic sensor mounting frame 15d, and moves the magnetic sensor mounting frame 15d in the vertical direction (Z-axis direction) around the mounting shaft 15c. On the other hand, when it is swung 45 degrees in either the left or right direction, it is positioned vertically (see FIG. 3). The reason why the locking members 25a are attached to the two positions is to eliminate the inclination of the hanging device 15 by independently controlling two motors (not shown) for lifting and lowering the hanging device 15. is there.

At the upper end of the locking member 25a, a locking member 2 is provided.
A stopper 25b for preventing falling is provided so that 5a does not fall off. On the other hand, at the lower end of the locking member 25a,
A disk 26 is attached as contact means for contacting a reference position serving as a starting point of positioning. This disk 26
Is large enough to contact a plurality of cathode support rods 34 and is free to rotate in the circumferential direction. At a predetermined position of the locking member 25a, a detection body 27 that is sensed by a non-contact type proximity switch is attached.

On the magnetic sensor mounting frame 15d near the locking member 25a, there are provided a deceleration sensor 29a, which is a proximity switch which operates by detecting the approach of the detection body 27, and a stop sensor 29.
b, Emergency stop sensors 29c are mounted at predetermined positions in order from below, and when each sensor detects the approach of the detection body 27, it operates and sends a signal to a lifting motor (not shown) to decelerate and stop the motor. , Emergency stop. In addition, since the magnetic sensor 13 was able to swing so as to be able to measure the magnetic flux of the left and right electrolytic cell side walls 30c of the electrolytic cell 30, in this embodiment, as shown in FIG. A locking member 25a is attached to the sensor 13 in a direction of 45 degrees around the mounting shaft 15c.
Are attached. With such a structure, it is possible to position either of the locking members 25a in the vertical direction regardless of which of the electrolytic cell side walls 30c the magnetic sensor 13 is directed to. That is, the magnetic sensor 1
When 3 is positioned in the right 45 degree direction, b operates, and when the magnetic sensor 13 is positioned in the left 45 degree direction, a operates (see FIG. 3). Therefore, in the present embodiment, a total of four locking members 25a are provided, two each at substantially both ends of the magnetic sensor mounting frame 15d.

In the illustrated preferred embodiment, the magnetic data measured by each magnetic sensor 13 is
5 by the data processing device 11 fixed on the upper surface of
The D-converted data is transmitted to a computer 50 installed in a control room separated from the place where the electrolytic cell 30 is installed. Then, it is printed out by a printer connected to the computer 50 and / or displayed on a monitor. The transmission of the magnetic data at this time is performed by radio communication using a high frequency. Wireless communication can transmit less data than optical communication, but has the advantage of eliminating the need for wiring. Of course, optical communication using an optical fiber can also be used.

Next, the operation of the abnormal electrode detection system in the above-described electrolytic smelting will be described. FIG. 6 is a flowchart of an embodiment of a method for detecting an abnormal electrode by relative evaluation in electrolytic smelting. In this detection method, roughly, in the electrolytic cell in which the electrolytic solution is stored, a cathode plate on the cathode side of the conductor fixed on the upper surface of the opposite side wall of the electrolytic cell,
On the anode side, an anode plate is disposed so as to be alternately immersed in a state where it is conductively supported, and an electrolysis step (step S1) in which electricity is supplied to the anode plates to perform electrolysis (step S1). Simultaneous measurement step of simultaneously measuring the magnetism in each part by bringing a large number of fluxgate magnetic sensors close to the vicinity of the contact between the conductor and the plurality of cathode plates and / or the vicinity of the contact between the conductor and the plurality of anode plates (Step S2), sending a large number of simultaneously measured values to the computer 50, removing 3 to 7 of each of the large and small measured values, and calculating the average of the remaining measured values. The anode and / or cathode plate measured by a magnetic sensor having a larger magnetic measurement value is short-circuited by using a predetermined value 1.3 times or more of this average value as an abnormality determination reference value. An abnormal position detection step of detecting a short circuit) position (step S3), and the output process to print out as a display and / or printed material detection result on the monitor (the step S4), and then the anode plate of the abnormality position and /
Or, a calibration step (step S5) for performing an operation of bringing the cathode plate into a normal state is provided.

In the preferred embodiment described above, a large number of measured simultaneously, the same number as the number of cathodes K in one electrolytic cell, for example, 56 measured values are sent to the computer 50,
Of these measured values, from large to small
An average value of the remaining measured values is obtained by removing seven, for example, five, and a predetermined value 1.3 times or more of this average value, for example, 1.5 times as an abnormality determination reference value, and Those having measured values are detected as short-circuit (short-circuit) positions. Of course, among the measured values measured simultaneously, the number to be removed is not limited to five. Any number may be used as long as an abnormal value is not empirically included in the measured value used for obtaining the average value. The average value of 1.3
Although the predetermined value which is twice or more is set as the abnormality determination reference value, any value may be used as long as it can empirically classify the abnormal position with respect to the average value. For example, a numerical value obtained by adding a predetermined value to the average value can be used instead of dividing the average value by a multiple. In a similar way,
A predetermined value equal to or less than 0.8 times the average value may be determined as an abnormality determination reference value, and a value having a measured value equal to or less than this value may be detected as an energization failure position. These calculation processes are performed by the computer 50 installed in a management room separated from the place where the electrolytic cell 30 is installed.

Prior to the determination of the abnormal position by the magnetic sensor 13 described above, zero adjustment and span adjustment of the magnetic sensor according to the present invention are performed for all the magnetic sensors 13. First, the overhead traveling crane 18 is operated, and
Is moved to a place of the electrolytic cell 30 where there is no influence of magnetism. Here, the terminal of the flexible electric wire 42 of the calibrator 40 is connected to the data processing device 11, and thereafter, the switch 40c for zero adjustment is pressed to enter the zero adjustment mode. At this time, it is possible to display on the liquid crystal display 40b that the "zero adjustment mode" is set. The computer 50d receives A / D-converted magnetic measurement values from a large number of magnetic sensors 13 and sends them, and automatically adjusts them sequentially so that all of them become "zero".

Next, the operator presses a span adjustment switch 40d to set a span adjustment mode. At this time, it is possible to cause the liquid crystal display 40b to display an indication that the mode is the “span adjustment mode”. The operator inputs “01” using the numeric keypad 40a to adjust the span of the first magnetic sensor 13. By the input from the calibrator 40, the computer 50 is in a system for adjusting the span of the first magnetic sensor 13. Here, the operator brings the standard permanent magnet 52 of which the magnitude of the magnetic force is known close to the first one of the magnetic sensors 13 mounted on the magnetic sensor mounting frame 15d. Since the magnitude of the magnetic force of the standard permanent magnet 52 is accurately known, the first magnetic sensor 13
Measurements from should also match that. If the measured value is different from the set value 50a, the adjustment start switch 40e is pressed to change and correct the weight 50b, and the comparison 50c is performed again. As a result, or when this is repeated several times, and when both become substantially the same, a display of the completion of correction is displayed on the liquid crystal display 40b. The operator continues to perform the same operation on the second and subsequent magnetic sensors 13, and all the magnetic sensors 1.
The span adjustment for No. 3 is completed. If the measured value does not match the set value despite several corrections, the NG lamp 40f is blinked as NG.

As a result, the worker can quickly know that the magnetic sensor 13 needs to be inspected as in the case where the magnetic sensor 13 breaks down, so that the work efficiency is dramatically improved. . Further, since such a calibration work can be performed by one worker alone at the position of the hanging device 15, the working efficiency is good, and the calibration work can be performed in about 1/4 of the conventional time. Have. Such a calibration work is performed about every three days. The actual magnetic measurement in the electrolytic cell 30 is performed after completing such a calibration operation.

The actual magnetic measurement in the electrolytic cell 30 will be described below. The hanging device 15 is moved above the target electrolytic cell 30 by horizontally moving a frame (not shown) and / or the slide body 18c. If there is an obstacle or the like during this movement, the second wire 15b is wound and the first wire 16b is wound to adjust the height.
When the moving device 18 reaches a predetermined position, the movement is stopped.
At this time, since the first cylindrical guide member 18d and the second cylindrical guide member 16d are present, the swing of the hanging device 15 due to the inertial force accompanying the movement of the moving device 18 is suppressed. afterwards,
By operating a lifting motor (not shown), the second wire 15b
Lowering and lowering the hanging device 15.

When the hanging device 15 descends, the disk 26 attached to the lower part of the two locking members 25a approaches the pole 34 for supporting the cathode (FIG. 4 (a)), and thereafter comes into contact (FIG. 4 (a)). b)). When the disk 26 comes into contact with the cathode support rod 34, the lowering of the locking member 25a stops, but the mounting portion with the magnetic sensor mounting frame 15d is slidable, so that the hanging device 15 is still lowered. Continue. As the hanging device 15 continues to descend, the magnetic sensor mounting frame 15d
Among the various sensors attached to, the deceleration sensor 29a attached at the bottom first approaches the detection body 27 (FIG. 4 (c)). Then, the deceleration sensor 29a that senses the approach of the detection body 27 issues a signal to decelerate the elevating motor. Upon receiving this signal, the lifting motor starts to decelerate,
The descending speed of the hanging device 15 is reduced.

When the hanging device 15 further continues to descend, the stop sensor 29b detects the approach of the detection body 27, and
A signal is issued to stop the lifting motor. And
The elevating motor receiving this signal stops, and the lowering of the hanging device 15 stops. If the elevating motor does not stop, the detection body 27 approaches the emergency stop sensor 29c. Therefore, the emergency stop sensor 29c detects the approach of the detection body 27 and issues a signal for emergency stopping the elevating motor.
Then, the elevating motor receiving this signal is emergency stopped, and the hanging device 15 is emergency stopped. These series of operations are performed independently at two places at both ends of the magnetic sensor mounting frame 15d.

In conjunction with the above movement, the position guiding means 10
The engagement member 2 in which the concave portion is attached to the positioning means 20
0a, and the engagement is started. When the hanging device 15 continues to descend further, the concave portion of the position guiding means 10 slides along the side surface of the conical engaging member 20a, and a large number of magnetic sensors 13 are provided on the predetermined cathode plate K. After the hanging device 15 is finely moved in the horizontal direction so as to be accurately positioned at a predetermined position close to the position, and the position is controlled, the magnetic flux is measured.

After measuring the magnetic flux at a predetermined position, the second wire 15b is wound up, the lifting device 15 is raised, and the magnetic sensor mounting frame 15d swings 90 degrees in the direction of the anode plate A, and the magnetic sensor 13 The anode plate A is moved in the X-axis direction so as to be located at the magnetic flux measurement position. Then, the hanging device 15 is lowered to measure the magnetic flux on the anode A side. Thereafter, the second wire 15b is wound up, the lifting device 15 is raised, the moving device 18 is horizontally moved, and the lifting device 15 is moved above the next target electrolytic cell 30, and this operation is repeated.

In the data processing device 11, each magnetic sensor 1
A / D conversion is performed on the magnetic flux density measured by 3 and the measured value is transmitted to a computer 50 installed in a control room isolated from the place where the electrolytic cell 30 is installed.
The computer 50 has a large number measured simultaneously, for example,
Of the 56 measured values, five were removed from the larger and smaller ones to determine the average of the remaining measured values, and a value 1.5 times the average was used as the abnormality determination reference value, Those having measured values are detected as short-circuit (short-circuit) positions. Further, an average value of 0.5 is set as an abnormality determination reference value, and a value having a measured value equal to or less than 0.5 is detected as an energization failure position. These detection results are printed out by a printer connected to the computer 50 and / or displayed on a monitor. The detection of an abnormal electrode by such a relative evaluation in electrolytic smelting is performed at night, during a time when there are no workers. Then, on the next day, the worker goes to the abnormality occurrence position based on the paper printed out by the printer or the information displayed on the monitor, and scrapes the bumps 37 on the surface of the cathode K, corrects the curvature and the like, and returns to the normal state.

The abnormal position of the electrode plate is specified as follows. First, as shown in FIG. 5, when the magnetic flux density on the cathode side is first measured by the magnetic sensor 13, a large amount of current flows through "C" where a short circuit has occurred among the plurality of cathode plates K. C "is determined to be abnormal. However, by measuring only the magnetic flux density on the cathode side, the abnormal cathode plate K (here, “C”) can be identified, but short-circuited to either surface of the anode plate A “B” or “D”. I don't know if it's happening. Then, next, when the magnetic flux density on the anode side is measured, “D” indicates an abnormal value and “B” indicates a normal value because a large amount of current flows in “D”. Therefore, since it is known that a short circuit has occurred between "C" and "D", "C" is pulled up and the bump 37 generated on the surface adjacent to "D" is removed.

[0040]

According to the method of calibrating a magnetic sensor used for detecting an abnormal electrode according to the present invention, a magnetic sensor capable of stably measuring magnetism is used as a sensor for measuring magnetism. Perform a magnetic measurement in a place where the magnetism of the electrolytic cell is not detected, perform zero adjustment, and then bring a standard permanent magnet with a known magnitude of magnetic force close to the magnetic sensor and read the value of the standard permanent magnet. In order to correct the weighting so as to be the magnetic magnitude of and to perform this for all the magnetic sensors, i.e., to correct the weighting using a standard permanent magnet whose magnetic force magnitude is accurately known, the span adjustment is performed. Has the effect that it can be performed accurately.

Further, since the zero adjustment and the weight correction are executed by inputting the number of the magnetic sensor through the hand-held calibrator, only one worker is required and there is no cooperative work with other workers. There is also an effect that can be performed in time.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a system for detecting an abnormal electrode in electrolytic smelting.

FIG. 2 is a partially enlarged perspective view of the abnormal electrode detection system of FIG. 1;

FIG. 3 is a schematic side view showing a mounting position of a locking member.

FIG. 4 is a sectional view showing the operation of the locking member.

FIG. 5A is a plan view for explaining a method for specifying a short-circuited electrode, and FIG. 5B is a side sectional view of FIG.

FIG. 6 is a flowchart of an embodiment of a method for detecting an abnormal electrode by relative evaluation in electrolytic smelting.

FIG. 7 is a perspective view of a typical example of a fluxgate magnetic sensor used in a system for detecting an abnormal electrode in electrolytic smelting.

FIG. 8 is a circuit diagram of the magnetic sensor of FIG. 7;

FIG. 9 is a front view of an embodiment showing an arrangement of a calibrator and related devices used when performing a method of calibrating a magnetic sensor used for detecting an abnormal electrode according to the present invention.

FIG. 10 is a schematic diagram for explaining a conventional method for supplying power to an electrolytic cell.

FIG. 11 is a perspective view of a power supply unit for an anode plate and a cathode plate in electrolytic smelting.

[Explanation of symbols]

Reference Signs List A Anode K Cathode 10 Position guide means 11 Data processing device 13 Magnetic sensor 15 Hanging device 15a Second guide rod 15b Second wire 15c Mounting shaft 15d Magnetic sensor mounting frame 16 Suspension member 16a First guide rod 16b First wire 16d First 2 cylindrical guide member 18 moving device 18a motor 18b rail 18c slide body 18d first cylindrical guide member 20 positioning means 20a engaging member 25a locking member 25b stopper 26 disk 27 detector 29a deceleration sensor 29b stop sensor 29c emergency stop sensor 26 Disk 27 Detector 29a Deceleration sensor 29b Stop sensor 29c Emergency stop sensor 30 Electrolyzer 30c Long side wall 32 Common conductor 34 Cathode support rod 35 Leg 37 Cob 40 Calibrator 40a Numeric keypad, 40b Liquid crystal display, 40c,
40d switch 40e adjustment start switch, 40f NG lamp 42 flexible electric wire 50 computer 52 standard permanent magnet

Claims (3)

[Claims] 1. A cathode plate on a cathode side of a conductor fixed on an upper surface of both opposite side walls of an electrolytic bath and an anode plate on an anode side of an electrolytic cell in which an electrolytic solution is stored. By being immersed alternately in a supported state, by simultaneously measuring the magnetism near the contact point between the conductor and the plurality of cathode plates and / or near the contact point between the conductor and the plurality of anode plates with a large number of magnetic sensors, A method for calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting for detecting and detecting an abnormal position of an electrode plate, wherein a magnetic sensor capable of stably measuring magnetism is used as a sensor for measuring the magnetism. , In its use,
First, perform a magnetic measurement in a place where the magnetism of the electrolytic cell is not detected, perform zero adjustment, and then bring a standard permanent magnet having a known magnetic force close to the magnetic sensor and read the standard permanent magnet. A method of calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting, wherein the weighting is corrected so as to have the known magnitude of magnetism, and the weighting is corrected for all magnetic sensors. 2. The method for calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting according to claim 1, wherein the zero adjustment and the weighting correction are performed by a computer electrically connected to a large number of magnetic sensors. A method for calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting, wherein the method is executed by inputting the number of the magnetic sensor through a hand-held calibrator. 3. The method for calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting according to claim 1 or 2, wherein the calibrator includes a standard permanent magnet from the magnetic sensor as a result of weighting correction. If the reading matches the known magnetic magnitude of the standard permanent magnet, a display indicating that the correction has been completed is displayed. If the reading does not match even though the correction has been performed a predetermined number of times, it indicates that the correction has not been completed. A method of calibrating a magnetic sensor used for detecting an abnormal electrode in electrolytic smelting, characterized by providing a display.