CN110646106B - Temperature detection device and system for rare earth molten salt electrolytic cell - Google Patents
Temperature detection device and system for rare earth molten salt electrolytic cell Download PDFInfo
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- CN110646106B CN110646106B CN201910972606.4A CN201910972606A CN110646106B CN 110646106 B CN110646106 B CN 110646106B CN 201910972606 A CN201910972606 A CN 201910972606A CN 110646106 B CN110646106 B CN 110646106B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/021—Particular circuit arrangements
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
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- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
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- G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
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- G01K1/08—Protective devices, e.g. casings
- G01K1/10—Protective devices, e.g. casings for preventing chemical attack
- G01K1/105—Protective devices, e.g. casings for preventing chemical attack for siderurgical use
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- G—PHYSICS
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- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
- G01K1/12—Protective devices, e.g. casings for preventing damage due to heat overloading
- G01K1/125—Protective devices, e.g. casings for preventing damage due to heat overloading for siderurgical use
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a temperature detection device and system for a rare earth molten salt electrolytic cell. The temperature detection device includes: the device comprises a fixing device, a rotary groove, a horizontal telescopic mechanical arm, a vertical telescopic mechanical arm, a thermocouple and a sleeve; the upper end of the fixing device is provided with the rotating groove; the horizontal telescopic mechanical arm is clamped in the rotary groove sheet, and one end of the horizontal telescopic mechanical arm, which is far away from the rotary groove, is connected with the vertical telescopic mechanical arm; the lower end of the vertical telescopic mechanical arm is fixed with the sleeve; the thermocouple is welded in the sleeve. The invention can detect the temperature of molten salt at any position in the electrolytic cell in real time in the rare earth electrolysis process.
Description
Technical Field
The invention relates to the field of remote temperature detection of an electrolysis production process, in particular to a temperature detection system of a rare earth molten salt electrolytic cell.
Background
The rare earth has excellent physical properties such as photoelectromagnetism and the like, is an indispensable key element for modifying the traditional industry, developing the emerging industry and the national defense science and technology industry, and becomes one of strategic resources of the country. The rare earth metal production energy consumption is high, the mechanical automation degree in the production process is low, the rare earth metal production is still completed manually, the production process is operated by the experience of an electrolyzer, the rare earth metal production is greatly influenced by manual factors, the product quality is unstable, and the development level of the rare earth electrolysis process is severely restricted.
The electrolysis temperature of the electrolytic cell is a very important process parameter for producing rare earth metals. The electrolysis temperature directly affects the yield, quality and electrolysis efficiency of the product, and further affects the cost of the electrolytic rare earth metal processing. In the actual production, workers judge the electrolysis temperature by observing the color of the molten salt with naked eyes, and perform corresponding operations such as feeding and pole changing. Such pure manual operation is likely to cause low current efficiency and large waste of raw materials. Whether the on-line detection can be carried out and the temperature of the molten salt in the cell is transmitted in real time is a problem to be solved urgently for realizing the automation of the rare earth molten salt electrolysis.
At present, the manual in-situ display mode adopted by the rare earth molten salt temperature detection mainly comprises the following two modes:
mode 1: an infrared thermometer is adopted for measurement, only the temperature of the surface of the molten salt can be measured, and the temperature of the bottom of the tank or the temperature inside the molten salt cannot be measured; because the rare earth molten salt can generate fluorine-containing gas in the electrolytic process and has a corrosion function, the infrared thermometer is placed above the electrolytic bath for a long time and can corrode a lens of the thermometer;
mode 2: the thermocouple of the temperature sensor is placed in a sleeve made of ceramic or other materials and then fixed in the electrolytic molten salt for measuring the temperature, and measured data is displayed on the spot and cannot be remotely monitored and displayed.
Disclosure of Invention
The invention aims to provide a temperature detection device and a temperature detection system for a rare earth molten salt electrolytic cell, which can detect the temperature of any part in the electrolytic cell in the rare earth electrolysis process in real time and realize remote monitoring.
In order to achieve the purpose, the invention provides the following scheme:
a rare earth molten salt electrolysis cell temperature detection device, the temperature detection device includes: the device comprises a fixing device, a rotary groove, a horizontal telescopic mechanical arm, a vertical telescopic mechanical arm, a thermocouple and a sleeve;
the upper end of the fixing device is provided with the rotating groove; the horizontal telescopic mechanical arm is clamped in the rotating groove, and one end of the horizontal telescopic mechanical arm, which is far away from the rotating groove, is connected with the vertical telescopic mechanical arm; the lower end of the vertical telescopic mechanical arm is fixed with the sleeve; the thermocouple is welded in the sleeve.
Optionally, the horizontal telescopic mechanical arm comprises: a first linear guide rail and a first ball screw;
the first linear guide rail is fixedly connected with the first ball screw through threads; the first linear guide rail is clamped in the rotating groove; one end, far away from the rotating groove, of the first ball screw is connected with the vertical telescopic mechanical arm.
Optionally, the vertical telescopic mechanical arm includes: the second linear guide rail, the second ball screw and the limit switch;
the second linear guide rail is connected with one end, far away from the rotary groove, of the horizontal telescopic mechanical arm; the sleeve is fixed at the lower end of the second ball screw; and the limit switch is fixed at the lower end of the second linear guide rail.
Optionally, a first air vent is arranged on the welding part between the thermocouple and the sleeve; and a second exhaust hole is formed in the upper end of the sleeve.
A rare earth molten salt electrolyzer temperature detection system, the temperature detection system comprising: the temperature detection device of any one of claims 1-4, the signal acquisition circuit, the microprocessor, the communication interface circuit, and the host computer;
the signal output end of a thermocouple of the temperature detection device is connected with the signal acquisition circuit, and the temperature detection device is used for detecting the temperature of the rare earth molten salt in the electrolytic cell and transmitting a molten salt temperature signal to the signal acquisition circuit;
the signal acquisition circuit is connected with the microprocessor and is used for sampling the molten salt temperature signal and transmitting the sampled molten salt temperature signal to the microprocessor;
the microprocessor is connected with the upper computer through the communication interface circuit and used for performing denoising filtering processing on the processed molten salt temperature signal and transmitting the molten salt temperature signal subjected to the denoising filtering processing to the upper computer through the communication interface circuit;
and the upper computer is used for converting the molten salt temperature signal into a temperature value and displaying and storing the temperature value.
Optionally, the temperature detection system further includes: a signal interference suppression circuit;
the signal interference suppression circuit is arranged between the signal acquisition circuit and the microprocessor and used for carrying out common-mode suppression interference processing on the sampled molten salt temperature signal and transmitting the processed molten salt temperature signal to the microprocessor.
Optionally, the signal interference suppression circuit includes a differential amplification circuit;
the differential amplification circuit comprises a first amplifier, a second amplifier, a first resistor, a second resistor, a third resistor and a capacitor;
the inverting input end of the first amplifier is connected with one end of the second resistor; the other end of the second resistor is grounded; the output end of the first amplifier is connected with one end of the third resistor;
the non-inverting input end of the second amplifier is connected with one end of the second resistor and the other end of the third resistor respectively; the inverting input end of the second amplifier and the output end of the second amplifier are both connected with one end of the first resistor; the other end of the first resistor and the same-direction input end of the first amplifier are connected with one end of the capacitor.
Optionally, the temperature detection system further includes: a temperature display circuit and a memory;
the temperature display circuit and the memory are respectively connected with the microprocessor.
Optionally, the temperature detection system further includes: a power supply circuit;
the power circuit is respectively connected with the temperature detection device, the signal acquisition circuit, the signal interference suppression circuit, the microprocessor, the temperature display circuit, the communication interface circuit and the memory.
Optionally, the power supply circuit includes: the power supply comprises an isolation transformer, a switching power supply, a first DC/DC conversion circuit and a second DC/DC conversion circuit;
the isolation transformer is connected with the input end of the switching power supply; the output end of the switching power supply is respectively connected with the input end of the first DC/DC conversion circuit and the input end of the second DC/DC conversion circuit; the output end of the first DC/DC conversion circuit is respectively connected with the power input end of the first amplifier and the power input end of the second amplifier; the output end of the second DC/DC conversion circuit is respectively connected with the power input end of the temperature detection device, the power input end of the signal acquisition circuit, the power input end of the microprocessor, the power input end of the temperature display circuit, the power input end of the communication interface circuit and the power input end of the memory.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the temperature detection device can realize the detection of the temperature of any part in the electrolytic cell in the rare earth electrolysis process through the coordination control of the rotary groove, the horizontal telescopic mechanical arm and the vertical telescopic mechanical arm.
The temperature detection system of the invention transmits the temperature detection signal to the upper computer, thereby realizing the real-time display, storage and remote monitoring of the temperature in the rare earth molten salt electrolytic cell.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a temperature detection device according to the present invention;
FIG. 2 is a diagram illustrating a connection structure between a thermocouple and a sleeve of the temperature detecting device according to the present invention;
FIG. 3 is a schematic structural diagram of a temperature detection system according to the present invention;
FIG. 4 is a circuit diagram of a differential amplifier circuit provided by the present invention;
FIG. 5 is a flow chart of a temperature detection method provided by the present invention;
description of the symbols: the method comprises the following steps of 1-temperature detection device, 2-signal acquisition circuit, 3-signal interference suppression circuit, 4-microprocessor, 5-communication interface circuit, 6-upper computer, 7-temperature display circuit, 8-memory, 9-horizontal telescopic mechanical arm, 10-vertical telescopic mechanical arm, 11-rotary groove, 12-first linear guide rail, 13-sleeve, 14-fixing device, 15-thermocouple, 16-first exhaust hole and 17-second exhaust hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a temperature detection device and a temperature detection system for a rare earth molten salt electrolytic cell, which can detect the temperature of any part in the electrolytic cell in the rare earth electrolysis process in real time and realize remote monitoring.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a temperature detection device of a rare earth molten salt electrolytic cell, as shown in figures 1 and 2, the temperature detection device 1 comprises: the device comprises a fixing device 14, a rotating groove 11, a horizontal telescopic mechanical arm 9, a vertical telescopic mechanical arm 10, a thermocouple 15 and a sleeve 13;
the upper end of the fixing device 14 is provided with a rotary groove 11; the horizontal telescopic mechanical arm 9 is clamped in the rotating groove 11, and one end of the horizontal telescopic mechanical arm 9, which is far away from the rotating groove 11, is connected with the vertical telescopic mechanical arm 10; a sleeve 13 is fixed at the lower end of the vertical telescopic mechanical arm 10; a thermocouple 15 is welded inside the sleeve 13, and the temperature measuring end of the thermocouple 15 is located inside the sleeve 13.
Because the rare earth molten salt has strong corrosivity, the sleeve 13 is preferably made of metal molybdenum or metal tungsten; the metal molybdenum and the metal tungsten have good acid corrosion resistance and corrosion resistance of various liquid metals, and the quality of the rare earth metal cannot be influenced; the thermocouple 15 is welded in the sleeve 13, and the position of the thermocouple 15 is kept in a fixed state during detection.
The horizontal telescopic mechanical arm 9 includes: a first linear guide 12 and a first ball screw; the first linear guide rail 12 is a hollow cylinder, and the inside of the first linear guide rail is in a thread shape; the first ball screw is a threaded cylinder and is fixedly connected with the first linear guide rail 12 through threads; the first linear guide rail is clamped in the rotary groove 11; one end of the first ball screw, which is far away from the rotating groove 11, is connected with the vertical telescopic mechanical arm 10; the horizontal telescopic mechanical arm 9 controls the sleeve 13 and the thermocouple 15 to move horizontally and forwards to complete the forward and backward movement of the temperature measuring device for inputting and withdrawing temperature measurement.
The horizontal telescopic mechanical arm 9 further includes: a second limit switch; the second limit switch is fixed on the first linear guide rail.
The vertical telescopic robot arm 10 includes: the second linear guide rail, the second ball screw and the limit switch; the second linear guide rail is connected with one end of the horizontal telescopic mechanical arm 9, which is far away from the rotary groove 11; a sleeve 13 is fixed at the lower end of the second ball screw, and the sleeve 13 and the second ball screw move together; the limit switch is fixed at the lower end of the second linear guide rail, and when the sleeve 13 contacts the bottom of the groove, the limit switch acts, the sleeve 13 stops moving downwards, temperature measurement is started, and damage to the sleeve 13 is effectively avoided; the vertical telescopic mechanical arm 10 controls the sleeve 13 and the thermocouple 15 to move up and down, and the molten salt liquid level temperature, the molten salt bottom temperature and the molten salt temperature at different depths are measured.
The rotary groove 11 controls the sleeve 13 and the thermocouple 15 to rotate and translate (rotate between 0-360 degrees), so that the electrolytic cell is convenient to replace and the electrolytic equipment is convenient to overhaul.
When temperature measurement is started, firstly, the rotary groove 11 is adjusted to enable the sleeve 13 to be positioned in the horizontal front of the electrolytic cell, then the horizontal telescopic mechanical arm 9 is controlled to enable the sleeve 13 to be positioned above the electrolytic cell, and finally the vertical telescopic mechanical arm 10 is controlled to move downwards to insert the sleeve 13 into molten salt to start temperature measurement; when the metal is discharged and the temperature is measured, the vertical telescopic mechanical arm 10 is controlled to move upwards firstly, so that the sleeve 13 leaves the liquid level of the electrolytic cell until the limit switch acts to stop moving, then the horizontal telescopic mechanical arm 9 is controlled to move horizontally to be away from the electrolytic cell until the second limit switch acts to stop moving, and finally the rotary groove 11 is manually controlled according to the field requirements until the field requirements are met, including replacement of the electrolytic cell or maintenance of electrolytic equipment.
Through the coordinated control of the horizontal telescopic mechanical arm 9, the vertical telescopic mechanical arm 10 and the rotary groove 11, the temperature of any position in the electrolytic cell can be detected, and the metal discharging operation, the electrolytic cell replacement and the overhauling work are not influenced.
A first exhaust hole 16 is formed at a welded portion between the thermocouple 15 and the sleeve 13; the upper end of the sleeve 13 is provided with a second exhaust hole 17; as the temperature in the sleeve 13 rises during temperature measurement, the pressure in the sleeve 13 increases, and the first exhaust hole 16 and the second exhaust hole 17 effectively prevent tube explosion.
The invention also provides a temperature detection system of the rare earth molten salt electrolytic cell, as shown in fig. 3, the temperature detection system comprises: the temperature detection device comprises a temperature detection device 1, a signal acquisition circuit 2, a microprocessor 4, a communication interface circuit 5 and an upper computer 6;
the signal output end of a thermocouple 15 of the temperature detection device 1 is connected with the signal acquisition circuit 2, and the temperature detection device 1 is used for detecting the temperature of the rare earth molten salt in the electrolytic cell and transmitting a molten salt temperature signal to the signal acquisition circuit 2; preferably, the signal output end of the thermocouple 15 is connected with the signal acquisition circuit 2 through a signal transmission line, and the signal transmission line adopts a shielding line to ensure that the outer shielding line is effectively grounded.
The signal acquisition circuit 2 is connected with the microprocessor 4, and the signal acquisition circuit 2 is used for sampling the molten salt temperature signal and transmitting the sampled molten salt temperature signal to the microprocessor 4; preferably, the Signal acquisition circuit 2 selects a Digital Signal Processor (DSP) of Microchip company for high-frequency Signal acquisition, the DSP has high-speed Processing capability, the working speed can reach 30MIPS, the temperature detection accuracy can be improved, and meanwhile, the working temperature of the DSP can reach 150 ℃, and the DSP has strong anti-interference capability, and can adapt to the strong magnetic field working environment of rare earth molten salt electrolysis; the DSP also has the advantages of low working voltage, low power consumption, strong driving capability and the like; preferably, the temperature detection signal sampling period is 1 k.
The microprocessor 4 is connected with the upper computer 6 through the communication interface circuit 5, and the microprocessor 4 is used for performing denoising filtering processing on the processed molten salt temperature signal and transmitting the molten salt temperature signal after the denoising filtering processing to the upper computer 6 through the communication interface circuit 5; a detection signal denoising model is established in the microprocessor 4, and the detection signal is filtered again through the signal denoising model and an algorithm, so that the temperature detection precision is effectively improved; preferably, the microprocessor is model number TMS320C 5000.
The communication interface circuit 5 is an RS232 serial interface; the communication protocol in the communication interface circuit 5 is realized by self development, the communication interface circuit 5 adopts event control and timing transmission, and the upper computer 6 adopts an event interrupt mode to receive, so that the two-way communication between the communication interface circuit 5 and the upper computer 6 is completed.
The communication protocol adopts a binary system mode to transmit data, and has the advantages of simplicity, convenience, high efficiency and high transmission speed; the binary code is provided with a start code, an end code, a timestamp, an address code, an operation code, a check code, a data length and a data number.
The data transmission is performed in the form of a whole packet, and if the data transmission is wrong, the upper computer 6 requests the communication interface circuit 5 to send the data again.
The upper computer 6 is used for converting the molten salt temperature signal into a temperature value and displaying and storing the temperature value.
The temperature detection system further includes: a signal interference suppression circuit 3; the signal interference suppression circuit 3 is arranged between the signal acquisition circuit 2 and the microprocessor 4, the other end of the signal interference suppression circuit 3 is connected with the microprocessor 4, and the signal interference suppression circuit 3 is used for carrying out common-mode suppression interference processing on the sampled molten salt temperature signal and transmitting the processed molten salt temperature signal to the microprocessor 4.
The signal interference suppression circuit 3 includes a differential amplification circuit including a first amplifier a as shown in fig. 41A second amplifier A2A first resistor R1A second resistor R2A third resistor R3And a capacitor C; first amplifier A1And the second resistor R2Is connected with one end of the connecting rod; a second resistor R2The other end of the first and second electrodes is grounded; a second resistor R2The grounding effectively avoids the measurement error caused by the field environment to the measurement interference, and only the first amplifier A is used for the reason that a plurality of grounds can form a grounding loop and easily interfere the small signal of the measurement circuit1The reverse input end of the transformer is connected with the ground; first amplifier A1And the output end of the third resistor R3Is connected at one end.
A second amplifier A2Respectively with the second resistor R2And a third resistor R3The other end of the first and second connecting rods is connected; a second amplifier A2And a second amplifier A2Output ends of the first and second resistors R1Is connected with one end of the connecting rod; a first resistor R1And the other end of the first amplifier A1Are connected with one end of a capacitor C.
The other end of the capacitor C is used as the input end of the differential amplification circuit; first amplifier A1The output end of the differential amplifier circuit is used as the output end of the differential amplifier circuit; the differential amplification circuit inhibits common-mode interference signals, and reduces interference of detection site environment and measurement errors.
The temperature detection system further includes: a temperature display circuit 7 and a memory 8; the temperature display circuit 7 and the memory 8 are respectively connected with the microprocessor 4; the temperature display circuit 7 can display the temperature value of the molten salt in the electrolytic bath; the memory 8 stores the temperature detection signal.
The temperature detection system further includes: a power supply circuit; the power supply circuit is respectively connected with the temperature detection device 1, the signal acquisition circuit 2, the signal interference suppression circuit 3, the microprocessor 4, the temperature display circuit 7, the communication interface circuit 5 and the memory 8. The power supply circuit includes: the power supply comprises an isolation transformer, a switching power supply, a first DC/DC conversion circuit and a second DC/DC conversion circuit;
the isolation transformer is connected with the input end of the switching power supply; the switching power supply required by the temperature detection circuit is supplied with power by the isolation transformer, so that the influence of a strong magnetic environment on the stability of the working power supply is avoided.
The output end of the switching power supply is respectively connected with the input end of the first DC/DC conversion circuit and the input end of the second DC/DC conversion circuit; the output end of the first DC/DC conversion circuit is respectively connected with the power input end of the first amplifier and the power input end of the second amplifier; the output end of the second DC/DC conversion circuit is respectively connected with the power input end of the temperature detection device 1, the power input end of the signal acquisition circuit 2, the power input end of the microprocessor 4, the power input end of the temperature display circuit 7, the power input end of the communication interface circuit 5 and the power input end of the memory 8; because the required voltage levels of the hardware modules in the detection circuit are different, preferably, the switching power supply is 24V, the switching power supply is converted into a 15V power supply through the first DC/DC conversion circuit, the switching power supply is converted into a 5V power supply through the second DC/DC conversion circuit, wherein the 15V power supply supplies power for the first amplifier and the second amplifier, and the 5V power supply supplies power for other module circuits in the detection circuit.
As shown in FIG. 5, the method for detecting the temperature of the rare earth molten salt electrolytic cell of the invention comprises the following steps:
step 501: the temperature detection device 1 detects the temperature of the molten salt in the electrolytic cell;
step 502: the signal acquisition circuit 2 samples temperature detection signals at high frequency;
step 503: the signal interference suppression circuit 3 performs interference suppression processing on the temperature detection signal;
step 504: the microprocessor 4 performs denoising filtering processing on the temperature detection signal, and the microprocessor 4 performs final denoising processing on the temperature signal by using an SWT (static wavelet Transform) method, which is specifically as follows:
step 5041: the temperature detection signal can be subjected to SWT to obtain an approximate coefficient C of a j layerj，CjUnder the action of low-pass filter and high-pass filterGet the approximate coefficient C of the j +1 layerj+1And a detail coefficient dj+1；
Step 5042: will dj+1Decomposing into m different intervals, calculating wavelet entropy of each interval, and setting the interval with maximum entropy as standard deviation sigma caused by j +1 layerj+1Then the threshold is:
wherein l (d)j+1,k+1) Is the interval signal length, k ═ 1, 2.., m-1, m;
step 5043: the bN wavelet system can flexibly remove signal noise, db 1-db 12 wavelet functions are selected to carry out 3-layer wavelet decomposition on signals, 12 de-noising signals are obtained after reconstruction, and db6 is selected as an optimal wavelet base;
step 505: the temperature detection signal after the noise-removing filtering processing is uploaded to the upper computer 6, the upper computer 6 converts the temperature detection signal into a temperature value, the temperature value is displayed and stored in real time, and a temperature curve of each electrolysis process is given.
The temperature detection device 1 is adopted to realize the detection of the temperature of any part in the electrolytic cell, the temperature distribution condition in the electrolytic cell can be obtained, and the analysis of the temperature distribution field in the electrolytic cell is convenient; the invention realizes the continuous measurement and real-time display and storage of the temperature in the rare earth molten salt electrolytic cell by combining the temperature detection system, and completes the remote monitoring of the temperature in the rare earth molten salt electrolytic cell;
the temperature detection system of the invention greatly reduces the labor intensity of workers and effectively improves the detection efficiency of the temperature in the electrolytic cell while not influencing the metal discharging operation of the electrolytic cell, the replacement of the electrolytic cell and the maintenance of electrolytic equipment; the method is easy to realize, simple and convenient to operate, can avoid the influence of high-temperature and strong magnetic environment on the detection precision, improves the temperature detection precision, and provides data support for realizing the automatic production of the rare earth molten salt electrolysis.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A temperature detection device for a rare earth molten salt electrolysis cell is characterized by comprising: the device comprises a fixing device, a rotary groove, a horizontal telescopic mechanical arm, a vertical telescopic mechanical arm, a thermocouple and a sleeve;
the upper end of the fixing device is provided with the rotating groove; the horizontal telescopic mechanical arm is clamped in the rotating groove, and one end of the horizontal telescopic mechanical arm, which is far away from the rotating groove, is connected with the vertical telescopic mechanical arm; the lower end of the vertical telescopic mechanical arm is fixed with the sleeve; the thermocouple is welded in the sleeve; a first exhaust hole is formed in the welding part between the thermocouple and the sleeve; the upper end of the sleeve is provided with a second exhaust hole;
the vertical telescopic mechanical arm comprises: a limit switch; the limit switch is fixed at the lower end of the second linear guide rail of the vertical telescopic mechanical arm and used for moving when the sleeve pipe contacts the bottom of the groove to stop moving downwards, and when the vertical telescopic mechanical arm is controlled to move upwards, the sleeve pipe leaves the liquid level of the electrolytic tank until the limit switch stops moving.
2. The temperature sensing device of claim 1, wherein the horizontally-telescoping mechanical arm comprises: a first linear guide rail and a first ball screw;
the first linear guide rail is fixedly connected with the first ball screw through threads; the first linear guide rail is clamped in the rotating groove; one end, far away from the rotating groove, of the first ball screw is connected with the vertical telescopic mechanical arm.
3. The temperature sensing device of claim 1, wherein the vertically telescoping robotic arm comprises: the second linear guide rail, the second ball screw and the limit switch;
the second linear guide rail is connected with one end, far away from the rotary groove, of the horizontal telescopic mechanical arm; the sleeve is fixed at the lower end of the second ball screw; and the limit switch is fixed at the lower end of the second linear guide rail.
4. A rare earth molten salt electrolysis cell temperature detection system, characterized in that, temperature detection system includes: the temperature detection device of any one of claims 1-3, the signal acquisition circuit, the microprocessor, the communication interface circuit, and the host computer;
the signal output end of a thermocouple of the temperature detection device is connected with the signal acquisition circuit, and the temperature detection device is used for detecting the temperature of the rare earth molten salt in the electrolytic cell and transmitting a molten salt temperature signal to the signal acquisition circuit;
the signal acquisition circuit is connected with the microprocessor and is used for sampling the molten salt temperature signal and transmitting the sampled molten salt temperature signal to the microprocessor;
the microprocessor is connected with the upper computer through the communication interface circuit and used for performing denoising filtering processing on the processed molten salt temperature signal and transmitting the molten salt temperature signal subjected to the denoising filtering processing to the upper computer through the communication interface circuit;
the upper computer is used for converting the molten salt temperature signal into a temperature value and displaying and storing the temperature value;
the communication interface circuit adopts event control and timing transmission, and the upper computer adopts event interrupt mode to receive, so as to complete the two-way communication between the communication interface circuit and the upper computer;
the temperature detection system further includes: a signal interference suppression circuit; the signal interference suppression circuit comprises a differential amplification circuit;
the differential amplification circuit comprises a first amplifier, a second amplifier, a first resistor, a second resistor, a third resistor and a capacitor;
the inverting input end of the first amplifier is connected with one end of the second resistor; the other end of the second resistor is grounded; the output end of the first amplifier is connected with one end of the third resistor;
the non-inverting input end of the second amplifier is respectively connected with one end of the second resistor and the other end of the third resistor; the inverting input end of the second amplifier and the output end of the second amplifier are both connected with one end of the first resistor; the other end of the first resistor and the same-direction input end of the first amplifier are connected with one end of the capacitor.
5. The temperature detection system of claim 4,
the signal interference suppression circuit is arranged between the signal acquisition circuit and the microprocessor and used for carrying out common-mode suppression interference processing on the sampled molten salt temperature signal and transmitting the processed molten salt temperature signal to the microprocessor.
6. The temperature sensing system of claim 4, further comprising: a temperature display circuit and a memory;
the temperature display circuit and the memory are respectively connected with the microprocessor.
7. The temperature sensing system of claim 6, further comprising: a power supply circuit;
the power circuit is respectively connected with the temperature detection device, the signal acquisition circuit, the signal interference suppression circuit, the microprocessor, the temperature display circuit, the communication interface circuit and the memory.
8. The temperature sensing system of claim 7, wherein the power circuit comprises: the power supply comprises an isolation transformer, a switching power supply, a first DC/DC conversion circuit and a second DC/DC conversion circuit;
the isolation transformer is connected with the input end of the switching power supply; the output end of the switching power supply is respectively connected with the input end of the first DC/DC conversion circuit and the input end of the second DC/DC conversion circuit; the output end of the first DC/DC conversion circuit is respectively connected with the power input end of the first amplifier and the power input end of the second amplifier; the output end of the second DC/DC conversion circuit is respectively connected with the power input end of the temperature detection device, the power input end of the signal acquisition circuit, the power input end of the microprocessor, the power input end of the temperature display circuit, the power input end of the communication interface circuit and the power input end of the memory.
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