Melt metal level measuring device

FIELD: measuring level of melt metals, possibly in systems for controlling manufacturing processes in metallurgical industry, for example in apparatuses for thermal-magnetic reduction of titanium.

SUBSTANCE: device includes exciting windings and metal level pickups in the form of induction turns, computing unit. Said windings and level pickups are placed in pairs around vessel with melt metal. Computing unit is connected with level pickups. It provides possibility for scanning pickups, digitizing voltage values of pickups, approximating pickups readings of designed curve found according to decision of simulation task, calculating derivative of said curve and determining metal level according maximum value of derivative. Excitement windings of device are connected in series and they form electromagnet.

EFFECT: enhanced accuracy, lowered labor consumption of measuring process.

2 cl, 3 dwg

 

The invention relates to devices for measuring the level of molten metal and can be used in the control systems of technological processes in the metallurgical industry, for example, in units miniterminal recovery of titanium.

Known inductive sensors are designed for level measurement in conductive environments (see A.S. USSR №428224, 1970). Their disadvantage is a large error.

The closest technical solution to the proposed design is that the device for determining the level of molten metal in the vessel containing the field winding and level sensors, and computing means (see RF patent №2194952, publ. 29.12.2002). The disadvantage of these devices is a large error and the need for calibration of the device.

The invention solves the problem of reducing the number of windings, reducing the complexity of measuring and improving its accuracy. To solve this task, the device for determining the level of molten metal in the vessel contains a field winding and level sensors, and computing means, and winding and the level sensors are arranged in pairs around the vessel with molten metal, and computing means connected to the level sensor and is configured to poll Yes the Chikov, the digitization of the voltages on the sensors, the approximation obtained from the sensors values calculated curve, calculating the derivative of this curve and determine the level of metal in the region of maximum values of the derivative, while the field winding is connected in series to form a solenoid.

A distinctive signs in the above total is the fact that winding and level sensors are arranged in pairs around the vessel with molten metal, and computing means connected to the level sensor and is configured to poll sensors, digitization voltages on the sensors, the approximation obtained from the sensors values calculated curve, calculating the derivative of this curve and determine the level of metal in the region of maximum values of the derivative, while the field winding is connected in series to form a solenoid.

The proposed device is illustrated in the drawings, in which figure 1 is a diagram of the sensors around the vessel with molten metal, figure 2 - calculated curve stresses, figure 3 - curve derivative calculated values.

The device comprises a field winding 1, the level sensor 2 in the form of induction coils, the computing means 3. Winding 1 and level sensors 2 are arranged in pairs for PR the cases of object control around the vessel 4 with the molten metal 5 in increments of L, equal to not more than 10 specified error αand winding 1 can be connected in series and form a solenoid, and the computing means 3 is connected to the level sensor 2 and is configured to poll sensors, digitization voltages on the sensors, the approximation of the calculated curve of stress 6 on the obtained values 7 (figure 2) from the sensors 2, calculating the derivative of this curve 8 (3) and determine the level of metal in the region of maximum values of the derivative.

The device operates as follows. On winding 1 is supplied with alternating voltage with a frequency different from the frequency of the mains (with the aim of getting rid of noise). In the windings of the level sensor 2 is induced induction EMF, which is registered computing means 3. Computing means 3 digitizes the received values and approximates their estimated curve 6 (see figure 2). Calculated curve can be obtained by solving the model problem of the distribution of the alternating magnetic field near the end of a metal cylinder of a given diameter and conductivity. When this is used, for example, the method of least squares (see Garn and Corn. Handbook of mathematics. M.: Nauka, 1978, str). Calculates the derivative of the calculated curve and is determined by the maximum value of the derivative along the curve 8 (see IG), position of which is determined by the level of metal. Series connection of field windings 1 allows you to increase the power of the signal from the level sensor 2.

Tests conducted to determine the level of molten magnesium in the vessel (retort) stainless steel with wall thickness of 20 mm, confirmed the efficiency of the device and the achievement of planned results (error α determining the level of molten metal does not exceed 0.5 cm). The device can reduce the number of field windings and level sensors, to improve the accuracy of determining the level metal, to ensure the error does not exceed the preset level, reduce the complexity of the operations of measurement by eliminating calibration device.

1. Device for determining the level of molten metal in the vessel containing the field winding and level sensors, and the processing means, characterized in that the field winding and the level sensors are arranged in pairs around the vessel with molten metal, and computing means connected to the level sensor and is configured to poll sensors, digitization voltages on the sensors, the approximation obtained from the sensors values calculated curve, calculating the derivative of this curve and determine the level of metal in the region of the maximum value is th derivative.

2. Device for determining the level of molten metal according to claim 1, characterized in that the field winding is connected in series to form a solenoid.



 

Same patents:

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3 cl, 1 dwg

Level gage // 2256158

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EFFECT: enhanced liquid-level measurement accuracy.

1 cl, 3 dwg

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FIELD: mechanical engineering.

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2 cl, 1 dwg

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1 dwg

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FIELD: electric measurement engineering.

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EFFECT: improved precision of measurement; improved manufacturability; improved efficiency of measurement.

6 dwg

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2 dwg

FIELD: measuring equipment engineering.

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EFFECT: higher precision.

7 cl, 5 dwg

Water level alarm // 2247334

FIELD: measuring engineering.

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1 cl, 5 dwg

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EFFECT: enhanced measurement accuracy; extended field of application.

2 cl, 3 dwg

The invention relates to the instrument and can be used for precision measurement of the level of the dielectric liquid

Inductive sensor // 2239792
The invention relates to the field of monitoring the level of liquid metal coolants and can be used mainly in the nuclear industry

The invention relates to the field of monitoring the level of liquid metal coolants and can be used mainly in the nuclear industry

FIELD: measurement technology; high-accuracy determination of liquefied gas mass in reservoir irrespective of its phase.

SUBSTANCE: three RF sensors of different length are placed in reservoir filled with liquefied gas. Sensors are connected to secondary converter. Length of first sensor vertically placed in reservoir corresponds to height of reservoir. Length of second vertical sensor is reduced from below by value no more than 0.35 of length of first sensor. Third sensor is located in gas phase of liquefied gas and its length is no more than 0.3 of length of first sensor. Each sensor may be connected to frequency-setting circuit of respective self-excited oscillator.

EFFECT: enhanced measurement accuracy; extended field of application.

2 cl, 3 dwg

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