SU1714568A1 - Melt temperature meter - Google Patents

Abstract

The invention relates to temperature measurements and improves their accuracy by automatically introducing an amendment to the readings of the pyrometer. Signals Usi, Us2 from radiation pyrometer 2 and signals UTI, UT2 from thermocouple 3, periodically immersed in the melt, measured at two different melt temperatures, are stored in the memory device 11. The current output signal Vs of the pyrometer 3 is fed to the first inputs of subtraction blocks 4, 5, which, together with subtraction blocks 6, 7, multiplication blocks 8, 9 and division block 10, form the corrected signal of the actual melt temperature Uc = _ UT2 (Us-Usi) -UTi (Us-Us2) Us2 - Usip the measuring device. 1 il post- ^ -''fe

Description

The invention relates to temperature measurements and can be used to measure the temperature of melts and alloys in metallurgical aggregates.

The aim of the invention is to improve the measurement accuracy by automatically introducing a temperature correction into the pyrometer readings.

The drawing shows the proposed device.

It contains a pyrometer of radiation 2 suspended on the surface of the melt 1, a short-term immersion thermoconverter 3, for example, a thermoelectric converter for periodic measurements of the actual temperature of the melts, four subtraction blocks 4, 5, 6, 7, two multipliers 8, 9, division block 10 and a memory device (DU) 11. To allow entry into the memory device 11 of 3 values measured by a thermoconverter, a key diagram 12 is used. To record measured values of temperature, a measuring register is used tying device 13,

The temperature of the melt is measured as follows. Pyrometer 2 is connected to the melt mirror 1. For automatic correction, two measurements are made of the actual melt temperature by a thermoelectric converter 3. At the first measurement, an electrical signal UT proportional to the actual temperature Ti of the melt is transferred from the thermal converter to one memory input 11. The same signal is resolved by key circuit 12 synchronous input in memory 11 values of the signal Usi,

proportional to the melting temperature of the melt, at the time of thermometer measurement of the actual temperature. The signals UTI and Usi are stored in memory 11. With a change in the melt temperature, which is sufficient to determine the correction with a given accuracy, a second measurement of the melt temperature with a thermometer is made. At the same time, signals UTJ and Us2, respectively, are received and stored in memory 11. Then, the corresponding signals of the previous correction cycle are erased from the memory of the memory unit 11, and the newly received signals are continuously transferred to the circuit for determining and introducing a temperature correction.

The current signal Us, from the pyrometer is proportional to the melting temperature of the melt, is constantly fed to the corresponding inputs of the subtraction blocks 4, 5. The second inputs are received from the charger 11 by the signals Usi and Usa. At the output of each block, the corresponding difference signal Us – Usi and Us – Us2 is generated . which is fed to the first input of the corresponding multiplication unit 8, 9. The corresponding UTI and Uia signal from the outputs of memory 11 is fed to the second input of the multiplication unit, so that the UTI (s - Usa) and (Lb - Usi) signals are formed at their outputs. fed to the inputs of the subtraction unit b. At its output, a UT2 (Us - Usi) Urt (Us - Us2) signal is generated. incoming to the input of the division unit 10, to another input of which a signal (Usi) arrives from the subtraction unit 7. Then from the output of the dividing unit, the signal corrected according to the algorithm

UT2 (Us-Usi) -UTi (Us-Us2) Us2-Usi

where Uc is a signal proportional to the actual temperature of the melt.

During the subsequent correction at the moment of entering into the memory device 11 temperature signals, the signals of the previous adjustment

Usv. Us2. UTI and UT2 are automatically erased from memory 11.

The device allows, by automatically calculating the actual melt temperature according to the proposed algorithm, to provide an increase in the measurement accuracy by introducing a correction for the indications of an additional thermometer of 3-5 K, without resorting to cumbersome analytical data.

0 calculations.

Formula of the invention

Temperature measuring device

5 melts containing a pyrometer of radiation, a key circuit, a measuring device and a short-term immersion thermocouple, distinguishing it with the fact that, in order to improve the measurement accuracy by automatically introducing a temperature correction to the pyrometer readings, a key diagram, four subtraction units, two blocks multiply block division and memory

5, the first information input of which is connected to the output of the thermal converter and the control input of the key circuit, the output of which is connected to the second information input of the storage device, and the input connected to the output of the radiation pyrometer and the first inputs of the first and second subtraction blocks, BTOpbie whose inputs are connected respectively to first and second outputs

5 memory devices and the inputs of the third subtraction unit, and the outputs are connected respectively to the first inputs of the first and second multiplication units, the second inputs of which are connected respectively to

0 by the third and fourth output of the memory device, and the outputs are connected to the inputs of the fourth subtraction unit, the output of which is connected to the first input of the division unit, the second input and the output of which are connected respectively to the output of the third subtraction unit and the input of the measuring device. Ju J

Claims (1)

Claim A device for measuring the temperature of melts containing a radiation pyrometer, a key circuit, a measuring device and a short-term immersion thermal transducer, characterized in that, in order to increase the accuracy of measurements by automatically introducing a temperature correction into the pyrometer readings, a key circuit, four subtraction units are introduced into it, two multiplication units, a division unit and a storage device, the first information input of which is connected to the output of the thermal converter and the control input of the key circuit, the path of which is connected to the second information input of the storage device, and the input is connected to the output of the radiation pyrometer and the first inputs of the first and second subtraction units, the second inputs of which are connected respectively to the first and second outputs of the storage device and the inputs of the third subtraction unit, and the outputs are connected respectively to. the first inputs of the first and second multiplication unit, the second inputs of which are connected respectively to the third and fourth outputs of the storage device, and the outputs are connected to the inputs of the four of the subtraction block, the output of which is connected to the first input of the Division block, the second input and output of which are connected respectively to the output of the third subtraction block and the input of the measuring device.