CN205914720U - Middle package temperature measurement system - Google Patents

Abstract

The utility model provides a tundish temperature measurement system, which comprises a thermocouple assembly, a signal conversion module, a single chip microcomputer, and a digital thermometer; the thermocouple assembly is embedded in the working layer of the tundish wall, and the output end of the thermocouple assembly It is connected with the input terminal of the signal conversion module, the output terminal of the signal conversion module is connected with the single-chip microcomputer, the sensing terminal of the digital thermometer is connected with the cold terminal of the thermocouple assembly, and the input and output terminals of the digital thermometer are connected with the single-chip microcomputer. The utility model embeds thermocouples in the tundish. First, the temperature of the inner wall of the tundish can be measured more representatively. When the baking temperature reaches a predetermined value, the amount of natural gas can be reduced to avoid excessive baking; When the tundish is poured, it can be used as a reference for measuring the temperature of molten steel. Because it is a multi-point temperature measurement, it can more accurately reflect the temperature field of molten steel in the tundish, which is conducive to studying the temperature change of molten steel in the tundish and formulating a more scientific tapping method. Temperature process and analysis of the relationship between ingot quality and pouring temperature.

Description

Tundish temperature measurement system

technical field

The utility model relates to the field of iron and steel smelting devices, in particular to a tundish temperature measuring system.

Background technique

Casting tundish in steelworks is usually mainly composed of cladding, pouring permanent layer, and working layer of cladding wall. Since the quality of steel ingot is sensitive to the temperature of molten steel, the temperature control of the tundish is strictly required. During the baking and pouring of the tundish, both The temperature inside the tundish needs to be controlled.

In the actual production process, in order to avoid insufficient temperature on the inner wall of the tundish, it can only be solved by increasing the amount of natural gas (coal gas) used and prolonging the baking time, but this has two disadvantages: one is that natural gas is expensive, and the baking The cost is about 4,000-5,000 yuan/hour, which increases the production cost; second, with the increase of gas volume and the extension of baking time, the stopper rod mechanism is deformed due to excessive temperature, which may easily cause the tundish to fail to close and drop slag, which will affect the quality of the steel ingot and cause safety accidents. Around the 1960s, the one-time-use fast miniature thermocouple probe gradually developed and became the standard technology for measuring the temperature of molten steel in the tundish. After gradual development, the actual temperature measurement now uses a temperature measuring gun. However, this measurement method requires manual spot measurement of the tundish every 5 to 10 minutes, and each furnace of steel is measured 3 to 5 times according to the change of molten steel temperature. In the temperature measurement of the tundish, the temperature of the upper and lower layers of the molten steel is different, and the temperature measuring gun cannot reflect the overall temperature of the molten steel due to the limitation of manual operation.

At present, the temperature of the inner wall of the tundish cannot be measured in real time during the baking process. The temperature of the inner wall is mainly estimated by measuring the temperature of the outer wall. The temperature is not representative enough. If the inner wall temperature is not enough, it can only be poured forcibly, which will easily cause low temperature pouring. At the same time, during the pouring process, the point measurement method of fast thermocouple is generally adopted, which cannot accurately reflect the change of the overall molten steel temperature, which is not conducive to post-analysis of the cause and improvement of steelmaking level.

Utility model content

Aiming at the defects in the prior art, the purpose of the utility model is to provide a tundish temperature measuring system.

A tundish temperature measurement system provided according to the utility model includes a thermocouple assembly, a signal conversion module, a single-chip microcomputer, and a digital thermometer;

The thermocouple assembly is embedded in the working layer of the tundish wall, the output end of the thermocouple assembly is connected to the input end of the signal conversion module, and the output end of the signal conversion module is connected to the single chip microcomputer, The sensing terminal of the digital thermometer is connected with the cold terminal of the thermocouple assembly, and the input and output terminals of the digital thermometer are connected with the single-chip microcomputer.

As an optimized solution, the thermocouple assembly includes several thermocouples distributed longitudinally in the working layer of the cladding wall, and the probes of the thermocouples are formed on the inner side wall of the tundish after extending out of the working layer of the cladding wall protruding, and the protruding direction of the probe is downward relative to the horizontal direction.

As an optimized solution, a multi-way selection switch is also included; the output end of the thermocouple assembly is connected to the input end of the signal conversion module through the multi-way selection switch.

As an optimized solution, it also includes a junction box and a compensation wire; the thermocouple assembly is connected to one end of the compensation wire through the junction box, and the other end of the compensation wire is connected to the multi-way selector switch.

As an optimization solution, the signal conversion module includes a differential amplifier, a voltage conversion circuit, an analog-to-digital conversion circuit, and a reference power supply;

The input end of the differential amplifier is connected to the output end of the thermocouple assembly, the output end of the differential amplifier is connected to the input end of the voltage conversion circuit, and the output end of the voltage conversion circuit is connected to the analog-to-digital conversion The input end of the circuit is connected, and the output end of the analog-to-digital conversion circuit is connected to the single-chip microcomputer; the reference power supply is respectively connected to the voltage conversion circuit and the analog-to-digital conversion circuit.

As an optimized solution, a storage module is also included; the storage module is connected with the single-chip microcomputer.

As an optimized solution, the storage module includes an erasable solid-state memory card.

As an optimized solution, a temperature display screen is also included; the temperature display screen is connected with the single-chip microcomputer.

As an optimized solution, an alarm is also included; the alarm is connected with the single-chip microcomputer.

As an optimized solution, a JTAG extension interface is also included, and the single-chip microcomputer is connected with the computer through the JTAG extension interface.

Compared with the prior art, the utility model has the following beneficial effects:

The utility model embeds thermocouples in the working bricks of the tundish. First, the temperature of the inner wall of the tundish can be measured more representatively. When the baking temperature reaches a predetermined value, the amount of natural gas can be reduced to avoid excessive baking; The second is that it can be used as a reference for measuring the temperature of molten steel during pouring of the tundish. Since it is a multi-point temperature measurement, it can more accurately reflect the temperature field of the molten steel in the tundish, which is conducive to the study of the temperature change of the molten steel in the tundish and formulates a more scientific The steel tapping temperature process and the relationship between the quality of the steel ingot and the pouring temperature are analyzed.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Figure 1 is a schematic structural diagram of an optional tundish temperature measurement system;

Fig. 2 is a schematic diagram of the insertion direction of the probe of the thermocouple in the working layer of the cladding wall.

In the figure, 1-thermocouple assembly, 2-junction box, 3-multi-channel selector switch, 4-differential amplifier, 5-voltage conversion circuit, 6-analog-to-digital conversion circuit, 7-digital thermometer, 8-storage module , 9-temperature display screen, 10-single chip microcomputer, 11-reference power supply, 12-JTAG expansion interface, 13-alarm.

detailed description

The utility model is described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present utility model. These all belong to the protection domain of the present utility model.

A tundish temperature measurement system provided according to the utility model, as shown in Figure 1, includes a thermocouple assembly 1, a signal conversion module, a single-chip microcomputer 10, and a digital thermometer 7;

The thermocouple assembly 1 is embedded in the working layer of the tundish, the output end of the thermocouple assembly 1 is connected to the input end of the signal conversion module, and the output end of the signal conversion module is connected to the single chip microcomputer 10, the sensing terminal of the digital thermometer 7 is connected to the cold terminal of the thermocouple assembly 1, and the input and output terminals of the digital thermometer 7 are connected to the single-chip microcomputer 10. The digital thermometer 7 obtains the reference temperature by accurately detecting the cold end of the thermocouple assembly 1, and sends the reference temperature to the single-chip microcomputer 10. In this embodiment, the single-chip microcomputer 10 is a C8051F020 single-chip microcomputer 10 as shown in FIG. 1 . The digital thermometer 7 is connected with the single chip microcomputer 10 through the GPIO interface.

As shown in Figure 2, the thermocouple assembly 1 includes several thermocouples distributed longitudinally in the working layer of the cladding wall, and the probes of the thermocouples protrude from the working layer of the cladding wall on the inner side wall of the tundish A protrusion is formed, and the protrusion direction of the probe is downward relative to the horizontal direction. Preferably, the probe of the thermocouple shown in Fig. 2 is inserted into the cladding working layer at an angle of 5° to the horizontal direction to form a bulge, and the downward insertion method can avoid the problem of slag hanging when pouring molten steel. The number of thermocouples in this embodiment is preferably three.

The tundish temperature measurement system also includes a multiplex switch 3; the output end of the thermocouple assembly 1 is connected to the input end of the signal conversion module through the multiplex switch 3 . The multi-way selector switch 3 connects the thermocouples and the signal conversion module in a preset order, and performs differential signal transmission on the temperature sensing signals of multiple thermocouples according to a preset cycle. As an option for multiplex switch 3, it can be realized by using 74LS138 decoder.

The tundish temperature measurement system also includes a junction box 2 and a compensation wire; the thermocouple assembly 1 is connected to one end of the compensation wire through the junction box 2, and the other end of the compensation wire is connected to the multi-way selector switch 3 . The tundish temperature measurement system is applied to measure the temperature of the inner wall of the tundish and the temperature of molten steel by adopting the plug-in and pull-out design of the compensation wire, with one machine for two purposes.

The signal conversion module includes a differential amplifier 4, a voltage conversion circuit 5, an analog-to-digital conversion circuit 6, and a reference power supply 11;

The input end of the differential amplifier 4 is connected to the output end of the thermocouple assembly 1, the output end of the differential amplifier 4 is connected to the input end of the voltage conversion circuit 5, and the output end of the voltage conversion circuit 5 is connected to the input end of the voltage conversion circuit 5. The input end of the analog-to-digital conversion circuit 6 is connected, and the output end of the analog-to-digital conversion circuit 6 is connected to the single-chip microcomputer 10; the reference power supply 11 is connected to the voltage conversion circuit 5 and the analog-to-digital conversion circuit 6 respectively.

The differential amplifier 4 differentially amplifies the signal obtained from the thermocouple, converts the signal voltage value to the voltage value range provided by the reference power supply 11 after passing through the voltage conversion circuit 5, and converts the original analog signal after passing through the A/D module The digital signal is sent to the single chip microcomputer 10 for the next step of processing.

The tundish temperature measurement system also includes a storage module 8; the storage module 8 is connected to the single-chip microcomputer 10.

The storage module 8 includes an erasable solid-state memory card. The storage module 8 can be memory such as commonly used SD card, MMC card. The tundish temperature measurement system can simply store the temperature data for subsequent calls.

The tundish temperature measurement system also includes a temperature display screen 9; the temperature display screen 9 is connected to the single-chip microcomputer 10. The temperature measurement data can be viewed on-site through the temperature display screen 9 without connecting to a computer.

The tundish temperature measurement system also includes an alarm 13; the alarm 13 is connected with the single-chip microcomputer 10. When it is detected that the temperature of the inner wall of the tundish reaches the preset standard, or exceeds the preset upper limit, or the temperature is not up to the standard during pouring, etc., the alarm can be prompted by the alarm 13 . The alarm 13 can further be a voice alarm 13 or a buzzer.

The tundish temperature measurement system also includes a JTAG expansion interface 12, and the single-chip microcomputer 10 is connected to a computer through the JTAG expansion interface 12.

The utility model embeds a three-point split-type armored tungsten-rhenium thermocouple in the working brick of the tundish. First, the temperature of the inner wall of the tundish can be measured more representatively. When the baking temperature reaches a predetermined value, the temperature can be reduced. The amount of natural gas used to avoid excessive baking; the second is that it can be used as a reference for measuring the temperature of molten steel during pouring of the tundish. Since it is a three-point temperature measurement, it can more accurately reflect the temperature field of molten steel in the tundish, which is conducive to the study of the temperature field in the tundish. The temperature change of molten steel, develop a more scientific tapping temperature process and analyze the relationship between ingot quality and pouring temperature. Due to the addition of the single-chip microcomputer 10, the automatic alarm of the tundish temperature can be realized. When the predetermined temperature is reached, the personnel can be reminded to adjust the roaster, and the automatic control of the roasting process can be realized by cooperating with the computer; the thermocouple adopts split armor. Design, when the front-end armored parts are damaged, it can be solved by replacing the head armor, which is convenient and practical, and the tungsten-rhenium thermocouple is cheap, and the temperature measurement accuracy meets steelmaking production. The utility model has a reasonable design, is controlled by a single-chip microcomputer 10, and reserves interfaces such as JTAG to facilitate connection with a computer and the like, and is beneficial to the realization of full-automatic control.

The specific design of the utility model is that the three-point thermocouple is connected with the 74LS138 decoder through the junction box 2, and the junction box 2 is connected with a compensation wire, which can be plugged freely; The voltage is transmitted to the PGA204 differential amplifier 4. Since the voltage is relatively weak, after the voltage is amplified 100 times, the 2.5V standard voltage provided by AD780 and the function of the voltage conversion circuit 5 will lift the transmitted voltage above zero and become ADS1252. For the identified differential signal, the ADS1252 transmits the signal to the C8051F020 single-chip microcomputer 10 in real time and accurately. The single-chip microcomputer 10 is connected with the DS18B20 digital thermometer 7 through the GPIO interface. The DS18B20 accurately measures the temperature of the cold end, and after the conversion of the temperature function, the single-chip microcomputer 10 displays the temperature of the working end on the temperature display screen 9. When the temperature reaches the preset temperature , the single-chip microcomputer 10 will send a signal, and the alarm 13 will work to remind the operator to properly adjust the roaster. At the same time, the single-chip microcomputer 10 is connected with the MMC card to store data therein, which is convenient for data extraction and analysis; and a JTAG interface is reserved, which can be connected with computers and other equipment, leaving room for upgrading for the fully automatic operation of ladle baking. If it is to be converted to measuring the temperature of molten steel, the tundish is placed on the working platform and then the compensation wire is connected to the junction box 2 to work. The principle of temperature measurement is the same as above.

The specific embodiments of the present utility model have been described above. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the utility model.

Claims (10)

1. a kind of tundish temp measuring system is it is characterised in that include thermocouple assembly, signal conversion module, single-chip microcomputer, numeral survey Wen Yi；

Described thermocouple assembly is embedded in the containment wall working lining of tundish, the outfan of described thermocouple assembly and described signal The input of modular converter is connected, and the outfan of described signal conversion module is connected with described single-chip microcomputer, described digit thermometer Sensing end be connected with the cold end of described thermocouple assembly, the input/output terminal of described digit thermometer and described single-chip microcomputer phase Even.

2. a kind of tundish temp measuring system according to claim 1 is it is characterised in that described thermocouple assembly is included in bag Along several thermocouples of genesis analysis in wall working lining, the probe of described thermocouple stretches out after described containment wall working lining in centre Formed raised on the medial wall of bag, and the protrusion direction of described probe is with respect to horizontal direction down.

3. a kind of tundish temp measuring system according to claim 1 is it is characterised in that also include multidiameter option switch；Institute The outfan stating thermocouple assembly is connected with the input of described signal conversion module by described multidiameter option switch.

4. a kind of tundish temp measuring system according to claim 3 is it is characterised in that also include rosette and compensation is led Line；Described thermocouple assembly is connected with one end of described compensating wire by described rosette, the other end of described compensating wire Connect described multidiameter option switch.

5. a kind of tundish temp measuring system according to claim 1 it is characterised in that described signal conversion module include poor Divide amplifier, voltage conversion circuit, analog to digital conversion circuit, reference power source；

The input of described difference amplifier is connected with the outfan of described thermocouple assembly, the outfan of described difference amplifier It is connected with the input of described voltage conversion circuit, the outfan of described voltage conversion circuit is defeated with analog-digital conversion circuit as described Enter end to connect, the outfan of analog-digital conversion circuit as described is connected with described single-chip microcomputer；Described reference power source connects described electricity respectively Voltage conversion circuit, analog to digital conversion circuit.

6. a kind of tundish temp measuring system according to claim 1 is it is characterised in that also include memory module；Described deposit Storage module is connected with described single-chip microcomputer.

7. a kind of tundish temp measuring system according to claim 6 it is characterised in that described memory module include erasable Solid-state memory card.

8. a kind of tundish temp measuring system according to claim 1 is it is characterised in that also include temperature display；Described Temperature display is connected with described single-chip microcomputer.

9. a kind of tundish temp measuring system according to claim 1 is it is characterised in that also include siren；Described alarm Device is connected with described single-chip microcomputer.

10. a kind of tundish temp measuring system according to claim 1 is it is characterised in that also include jtag expansion interface, institute State single-chip microcomputer to be connected with computer by described jtag expansion interface.