CN114279861B - Automatic testing system for mechanical properties of superconducting conductor and implementation method thereof - Google Patents
Automatic testing system for mechanical properties of superconducting conductor and implementation method thereof Download PDFInfo
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- CN114279861B CN114279861B CN202111634236.7A CN202111634236A CN114279861B CN 114279861 B CN114279861 B CN 114279861B CN 202111634236 A CN202111634236 A CN 202111634236A CN 114279861 B CN114279861 B CN 114279861B
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Abstract
The invention provides an automatic test system for mechanical properties of a superconducting conductor and an implementation method thereof. The test system mainly comprises: the device comprises an upper computer, a compactRIO embedded control host, an accessory board card, a mechanical testing machine, a pressure sensor, a low-temperature extensometer, a liquid nitrogen sensor, an electromagnetic valve, a liquid level controller, a temperature controller, a heating resistor, a heating disc, a temperature sensor, a power supply, a liquid nitrogen Dewar, a tested sample and the like. The automatic testing system for the mechanical properties of the superconducting conductor has the characteristics of high integration level, stable performance, accurate detection and the like, can realize high-precision, real-time and efficient acquisition of displacement and pressure, can simultaneously configure sampling frequency, and can establish corresponding acquisition rates aiming at pressure circulation of different periods.
Description
Technical Field
The invention relates to the field of superconducting conductor performance test, in particular to an automatic test system for mechanical properties of a superconducting conductor.
Background
With the continuous reduction of traditional fossil energy, new generation energy exploration is carried out in various countries around the world, and new energy generated by nuclear fusion is widely focused as clean and efficient energy. The superconducting magnet system is a core component of a nuclear fusion device and comprises a TF coil, a CS coil, a PF coil and a CC coil, wherein each coil is made of a superconducting conductor. During operation, the conductor generally works under the complex environment conditions of strong magnetic field, extremely low temperature and high current, so that the performance of the conductor also needs to be detected after the design and development of the conductor are finished, and the critical performance of the conductor needs to be evaluated under the environment of the simulated working condition.
The superconducting conductor mechanical property test is a research on conductor performance degradation change by simulating electromagnetic force strain and thermal strain of a fusion reactor magnet under an operating condition. The experiment requires the superconducting conductor to carry out the cyclic test of mechanical properties in a low-temperature region, has the characteristics of long duration, large data volume and the like, the traditional acquisition test system only acquires related signals, has the characteristics of analysis, processing and the like, and cannot establish connection control with an instrument, and a large amount of manpower is consumed in the experimental process and the later data processing process. The superconducting conductor low-temperature mechanical property measurement and control system has the functions of online data processing, real-time display, instrument control and the like, and a user can realize the functions of testing, acquisition, control, analysis, processing and the like by simply setting, so that the automation of a testing process can be realized in an experimental process, and the later heavy data processing task of personnel can be lightened, and the superconducting conductor low-temperature mechanical property measurement and control system has the characteristics of high efficiency, rapidness, convenience and the like.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide an automatic test system for mechanical properties of a superconducting conductor and an implementation method thereof.
The automatic testing system for the mechanical properties of the superconducting conductor comprises a software part and a hardware part, wherein the hardware part comprises a pressure control unit, a heating control unit, a liquid level control unit, a displacement measurement unit and an acquisition control unit; the software part consists of an FPGA acquisition program, an RT data processing program and an upper computer control program;
the pressure control unit comprises a mechanical testing machine, a pressure sensor and a pressure dividing module; the pressure sensor is arranged on a pressure transmission column of the mechanical testing machine and used for detecting the pressure applied by the mechanical testing machine; the pressure transmission column comprises an upper transmission column and a lower transmission column; the pressure dividing module is connected with the pressure sensor and is used for dividing the pressure of the pressure transmission column on the sample;
the heating control unit comprises a heating resistor, a heating disc, a temperature sensor and a temperature monitor, wherein the heating disc is provided with an upper heating disc layer and a lower heating disc layer, the lower heating disc layer is provided with a groove, the heating resistor is embedded into the groove of the lower heating disc layer and is used for generating heat, the upper heating disc is arranged between an upper transmission column and a voltage dividing module of the mechanical testing machine, the lower heating disc is arranged on a lower transmission column of the mechanical testing machine and is positioned on the upper side of the pressure sensor, the temperature sensor is placed in the heating disc layer and is used for detecting the temperature of the heating disc layer, and the temperature monitor is used for adjusting the temperature according to a set value in real time and keeping constant temperature;
the liquid level control unit comprises a low-temperature control valve, a liquid nitrogen sensor, a liquid level monitor and an electromagnetic valve controller; the low-temperature control valve controls the opening and closing of the liquid nitrogen input channel, the liquid level sensor is used for measuring the liquid level of liquid nitrogen, the liquid level monitor is used for displaying and detecting the real-time liquid level of the liquid nitrogen and sending an opening and closing instruction to the electromagnetic valve controller, and the electromagnetic valve controller controls the opening and closing of the electromagnetic valve according to the instruction of the liquid level monitor;
the displacement measuring unit comprises a low-temperature extensometer and a voltage source, wherein the low-temperature extensometer is arranged on the experimental armor and is used for measuring the displacement change of the experimental armor under pressure, and the voltage source is used for providing stable voltage for the low-temperature extensometer and the pressure sensor;
the acquisition control unit comprises an upper computer, a CompactRIO controller and an accessory acquisition board card;
the FPGA acquisition program is used for acquiring the applied force and the experimental armor strain displacement of the mechanical experiment machine;
the RT data processing program is used for processing data acquired by the FPGA layer and processing pressure, cycle times, energy and displacement information;
the upper computer control program is a man-machine interaction program and an interaction program with the temperature controller and the liquid level controller, and is used for displaying displacement and pressure change, setting the adjustment range of temperature and liquid level and sending out relevant control instructions of an operator;
the FPGA acquisition program and the RT data processing program adopt a FIFO protocol for data transmission, and the RT data processing program and the upper computer control program adopt a network variable and a network flow protocol for data transmission.
Furthermore, the temperature controller is connected with the CompactRIO controller by adopting an RS485 communication protocol, and the liquid level controller is connected with the CompactRIO controller by adopting a TCP/IP communication protocol.
Further, the heating control unit is used for heating the pressure sensor, so that the pressure sensor is ensured to work in a temperature range of 15-30 ℃.
Further, the heating resistor in the heating control unit is annular in appearance, the heating disc is hollow cylinder-shaped, and the inner annular wall is provided with threads.
Furthermore, the gap between the heating resistor and the groove of the lower heating disc is filled with soldering tin, and the upper heating disc and the lower heating disc are sealed by welding.
Further, the liquid level control unit is used for regulating and controlling the height of the low-temperature liquid, when the liquid level is lower than a system set value, the electromagnetic valve is opened to carry out liquid supplementing, and when the liquid level is higher than the system set value, the liquid supplementing is stopped; the liquid is ensured to be always in a low-temperature medium in the test process.
Furthermore, the low-temperature extensometer adopts a Nile-type ultralow-temperature extensometer, 4 low-temperature strain gages are arranged on two side bridge arms of the low-temperature extensometer, and strain changes on the bridge arms are accurately measured in a temperature region of 4.2K-77K.
Further, the FPGA acquisition program and the RT data processing program run on the compactRIO controller, and the upper computer control program runs on the PC end; the FPGA end acquisition program supports shunt calibration and offset calibration and sampling frequency adjustment for displacement and pressure measurement; the RT data processing program can distinguish the cycle times, automatically judge the pressure displacement maximum value of each cycle, and calculate the energy of each cycle; the data storage file of the RT data processing program is in a TDMS format, and the data is stored in an external storage container of the compactRIO controller.
Further, the RT data processing program comprises an upper computer message receiving and transmitting process, an RT end message processing process, a data analysis processing process, a data storage process and an FPGA end message receiving and transmitting process.
The invention also provides a method for realizing the superconducting conductor mechanical property automatic test system, which comprises the following steps:
(1) Assembling the components of the test system;
a. placing a heating resistor in a groove of a lower heating disc, filling a gap with soldering tin, welding and sealing an upper heating disc and a lower heating disc, and simultaneously connecting the heating resistor with a temperature monitor;
b. embedding a temperature sensor into the upper heating plate, and simultaneously connecting a signal wire of the temperature sensor into a temperature controller;
c. placing a liquid level sensor in a measuring container, vertically placing the liquid level sensor and fixing the liquid level sensor by adopting a bracket, and simultaneously connecting the liquid level sensor with a liquid level monitor;
d. the low-temperature control valve is arranged at the low-temperature medium output end and is connected with the corresponding control signal line and the liquid level controller;
e. connecting a temperature monitor with a liquid level controller and a CompactRIO controller;
f. the cryoextensometer is connected to an accessory module of the CompactRIO controller.
(2) Setting related parameters of an FPGA acquisition program, a temperature monitor, a liquid level monitor and a mechanical testing machine;
(3) Starting a test, and collecting, analyzing and storing related data:
a. opening a test system acquisition page to acquire signals and simultaneously opening a data storage function;
b. starting a mechanical testing machine and starting testing;
c. analyzing the data of the test system, collecting the pressure value and the displacement value at the current moment in real time by the test system, serializing the pressure value and the displacement value, entering a judging maximum period mode when the collected pressure value is larger than 90% of the predicted pressure value for the first time, obtaining the maximum value from the current moment to the previous moment when the collected pressure value is smaller than 90% of the predicted pressure value again, recording the data serial number at the moment, fully indexing the pressure value from the serial number to the ending serial number at the previous moment, obtaining the minimum value, recording the serial number of the data, taking out the pressure value and the displacement value from the minimum serial number to the maximum serial number, outputting the test data required by the current cyclic loading, and re-serializing the lower group data and outputting the analysis processing result;
(4) And stopping collecting and storing after the experiment is ended, and deriving experimental data.
The beneficial effects are that:
(1) According to the automatic testing system for the mechanical properties of the superconducting conductor, the compactRIO controller is connected with the low-temperature extensometer and the pressure sensor through the accessory board card, and the shunt calibration and bias calibration program is designed in the FPGA acquisition program, so that the high-precision, real-time and high-efficiency acquisition of displacement and pressure can be realized. Meanwhile, the sampling frequency can be configured, and corresponding acquisition rates can be established for pressure circulation of different periods.
(2) In the temperature control unit, the heating resistor is arranged in the heating disc and is arranged between the pressure sensor and the pressure dividing module, and the temperature of the heating disc is kept through the temperature control instrument, so that cold conduction from the pressure dividing module immersed in a low-temperature medium can be isolated, and the pressure sensor is ensured to be at a normal working temperature.
(3) In the liquid level control unit, the electromagnetic valve controller and the liquid level monitor can independently form a closed loop, the upper computer applies liquid level height range information to the liquid level monitor, the liquid level control unit can work, the height change of a low-temperature medium in a container in the experimental process is regulated, and the reliability of the experimental test environment is ensured.
(4) In the RT data processing program, the maximum value of each circulation pressure can be judged in real time according to the acquired data, the circulation times in the process of multiple circulation are reasonably defined, and meanwhile, the energy value of each circulation is calculated and displayed on a user interface in real time, so that the real-time observation of a user is facilitated.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a pressure loading unit of the present invention;
FIG. 2 is a schematic diagram of a heating plate of the heating control unit of the present invention; wherein, the left diagram is a lower heating plate schematic diagram, and the right diagram is an upper heating plate schematic diagram;
FIG. 3 is a diagram of the overall architecture of the automated test system of the present invention;
FIG. 4 is a software architecture diagram of an automated test system of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides an automatic test system for mechanical properties of a superconducting conductor and an implementation method thereof, which can simultaneously realize the functions of motion control of a plurality of linkage units of the system, high-precision strain displacement signal acquisition under a low-temperature environment and the like.
In order to realize the monitoring of the strain state of the superconducting conductor under different pressure and further realize the optimization of the performance of the superconducting conductor, the strain displacement of the superconducting conductor under different pressure states is required to be measured. For the automatic testing system for the mechanical properties of the superconducting conductor, a low-temperature extensometer can be added at the outer armor of the superconducting conductor, and a proper bridge circuit is adopted to convert a strain signal into an electric signal for subsequent circuit processing and acquisition.
Referring to fig. 1, the automatic testing system for mechanical properties of a superconducting conductor comprises a software part and a hardware part, wherein the hardware part comprises a pressure control unit, a heating control unit, a liquid level control unit, a displacement measurement unit and an acquisition control unit. The pressure control unit comprises a mechanical testing machine 1, an upper heating disc 2, a pressure dividing module 3, a spring corrugated pipe 4, a support rack 5, a lower heating disc 6 and a pressure sensor 7; the upper heating plate 2 is arranged on an upper transmission column of the mechanical testing machine and is positioned between the upper transmission column and the pressure dividing module 3 and used for isolating cold conduction from a low-temperature medium and avoiding damage of low temperature to a brake arm on the mechanical testing machine; the pressure dividing module 3 is arranged below the upper heating plate 2 and is used for equally dividing the pressure applied to the superconducting conductor, so that the stress of each part of the conductor is ensured to be uniform; the spring bellows 4 (in the front blue font) is used for sealing the tightness of the low-temperature container, so that the loss of a low-temperature medium is reduced; the lower heating plate support rack 5 is used for providing support for the low-temperature container; the lower heating plate 6 is arranged on a lower transmission column of the mechanical testing machine and is positioned on the upper side of the pressure sensor and used for isolating cold conduction from a low-temperature medium and avoiding damage of the low temperature to the pressure sensor 7; the pressure sensor 7 is arranged below the lower heating plate 6 and is used for measuring the pressure load of the mechanical testing machine.
Referring to fig. 2, the heating control unit includes a heating resistor 10, a heating plate, a temperature sensor 11 and a temperature monitor, where the heating plate has two layers, an upper heating plate 2 and a lower heating plate 6. The inner side of the lower heating plate 6 is engraved with a groove, the heating resistor 10 can be placed in the groove, and a gap between the heating resistor 10 and the groove is filled by adopting a hot-dip soldering method. The inside drilling of last heating plate 2 for place temperature sensor 11, temperature sensor 11 outside is wrapped up in heat conduction silicone grease, and the afterbody adopts resin seal, and temperature sensor 11 does not contact with heating resistor direct contact, does not contact with outside air direct. The upper heating plate 2 and the lower heating plate 6 are connected by welding to seal. The lower heating plate 6 is arranged on a lower transmission column of the mechanical testing machine 1 and is positioned on the upper side of the pressure sensor, the temperature sensor 11 is arranged in the heating plate and used for detecting the temperature of the heating plate, and the temperature monitor adjusts the temperature in real time according to a set value and keeps constant temperature.
Referring to fig. 3, the liquid level control unit is composed of a solenoid valve, a solenoid valve controller, a liquid level monitor and a liquid level sensor, the liquid level sensor detects the height of the low-temperature medium to ensure that the superconducting conductor is soaked in the low-temperature medium, the liquid level monitor is used for displaying and detecting the real-time height of liquid nitrogen and receiving data sent by the main control system, and the solenoid valve controller is controlled to adjust the switch of the solenoid valve in real time to timely supplement the consumption of the low-temperature medium at room temperature. The electromagnetic valve comprises a low-temperature control valve which controls the opening and closing of the liquid nitrogen input channel, the liquid level sensor is used for measuring the liquid level of liquid nitrogen, and the electromagnetic valve controller controls the opening and closing of the electromagnetic valve according to the instruction of the liquid level monitor.
The temperature control unit is composed of a temperature sensor, a temperature controller and a heating resistor, the temperature of the heating disc is detected by the temperature sensor and fed back to the temperature monitor, the power of the heating resistor is regulated by the temperature monitor, and the temperature of the heating disc is ensured to be kept within the temperature range of 15-30 ℃.
The displacement measuring unit is composed of a CompactRIO controller, an NI9237 and a low-temperature extensometer. The low-temperature extensometer is used for detecting strain displacement signals, the NI9237 is used for collecting pressure signals and displacement signals, and the compactRIO controller is used for analyzing, processing, displaying, storing and the like signals. The electrical signals are collected through the CompactRIO attached NI9237 module, and meanwhile, the collected signals are subjected to real-time shunt calibration and bias calibration, and accurate measurement is carried out on displacement signals in a rapid corresponding mode. Referring to fig. 4, a software architecture diagram of the automated testing system for mechanical properties of superconducting conductors according to the present invention is shown. The host PC mainly comprises a data display process and a parameter setting process, and is used for realizing the display of parameters such as pressure, displacement and the like and controlling a temperature monitor, a liquid level monitor and the like. The software part consists of an FPGA acquisition program, an RT data processing program and an upper computer control program. The acquisition control unit comprises an upper computer, a CompactRIO controller and an accessory acquisition board card. The CompactRIO controller comprises a real-time controller layer and an FPGA acquisition program; the real-time controller layer mainly realizes data receiving and transmitting. And processing the data collected by the lower computer at the layer, analyzing the maximum and minimum values of each pressure cycle in real time, and recording the corresponding strain displacement value. Meanwhile, the data storage process can store the analyzed result in real time. The FPGA acquisition program mainly realizes the cyclic acquisition of pressure signals and displacement signals, the sampling rate can be self-defined and adjusted to be up to 10KS/s, and meanwhile, the module supports the bridge circuit to carry out shunt calibration and bias calibration.
Preferably, the displacement measuring unit comprises a low-temperature extensometer and a voltage source, wherein the low-temperature extensometer is arranged on the experimental armor and used for measuring the displacement change of the experimental armor under pressure, and the voltage source is used for providing stable voltage for the low-temperature extensometer and the pressure sensor.
Preferably, the RT data processing program is configured to process data collected by the FPGA collecting program, and process pressure, cycle number, energy, and displacement information.
Preferably, the upper computer control program is a man-machine interaction program and an interaction program with the temperature controller and the liquid level controller, and is used for displaying displacement and pressure change, setting the adjustment range of temperature and liquid level and sending out relevant control instructions of an operator.
Preferably, the FPGA acquisition program and the RT data processing program use FIFO protocols for data transmission, and the RT data processing program and the upper computer control program use network variables and network streaming protocols for data transmission.
Preferably, the temperature controller is connected with the CompactRIO controller by adopting an RS485 communication protocol, and the liquid level controller is connected with the CompactRIO controller by adopting a TCP/IP communication protocol.
Preferably, the heating control unit is used for heating the pressure sensor, so that the pressure sensor is ensured to work in a temperature range of 15-30 ℃.
Preferably, the heating resistor in the heating control unit is annular in appearance, the heating disc is hollow cylinder-shaped, and the inner annular wall is provided with threads.
Preferably, the upper and lower heating plates are sealed by welding.
Preferably, the liquid level control unit is used for regulating and controlling the height of the low-temperature liquid, opening the electromagnetic valve to supplement liquid when the liquid level is lower than a system set value, and stopping supplementing liquid when the liquid level is higher than the system set value; the liquid is ensured to be always in a low-temperature medium in the test process.
Preferably, the low-temperature extensometer is a Nile-type ultralow-temperature extensometer, 4 low-temperature strain gages are arranged on two side bridge arms of the low-temperature extensometer, and strain changes on the bridge arms are accurately measured in a temperature region of 4.2K-77K.
Preferably, the FPGA acquisition program and the RT data processing program run on a compactRIO controller, and the upper computer control program runs on a PC end.
Preferably, the RT data processing program can distinguish the cycle times, automatically distinguish the pressure displacement maximum value of each cycle, and can calculate the energy of each cycle.
Preferably, the data storage file of the RT data processing program is in a TDMS format, and the data is stored in an external storage container of the CompactRIO controller.
Preferably, the RT data processing program includes an upper computer message receiving and transmitting process, an RT end message processing process, a data analysis processing process, a data storage process, and an FPGA end message receiving and transmitting process.
The invention also provides a method for realizing the automatic test system of the mechanical properties of the superconducting conductor, which comprises the following steps:
(1) Firstly, assembling components of a test system;
a. placing a heating resistor in a groove of a lower heating disc, filling a gap with soldering tin, welding and sealing an upper heating disc and a lower heating disc, and simultaneously connecting the heating resistor with a temperature monitor;
b. embedding a temperature sensor into the upper heating plate, and simultaneously connecting a signal wire of the temperature sensor into a temperature controller;
c. placing a liquid level sensor in a measuring container, vertically placing the liquid level sensor and fixing the liquid level sensor by adopting a bracket, and simultaneously connecting the liquid level sensor with a liquid level monitor;
d. the low-temperature control valve is arranged at the low-temperature medium output end and is connected with the corresponding control signal line and the liquid level controller;
e. connecting a temperature monitor with a liquid level controller and a CompactRIO controller;
f. the cryoextensometer is connected to an accessory module of the CompactRIO controller.
(2) Then, setting relevant parameters of an FPGA acquisition program, a temperature monitor, a liquid level monitor and a mechanical testing machine;
a. setting parameters of sampling rate, offset calibration and shunt calibration of an FPGA acquisition program;
b. setting parameters of a temperature monitor, including a temperature value to be maintained and an allowable error range;
c. setting parameters of the liquid level monitor, including a liquid level height value to be maintained and an allowable error range;
d. setting parameters of a mechanical testing machine, and setting loading pressure, cycle times, pressure waveforms and the like according to experimental requirements;
(3) Starting a test, and collecting, analyzing and storing related data;
a. opening a test system acquisition page to acquire signals and simultaneously opening a data storage function;
b. starting a mechanical testing machine and starting testing;
c. in the data analysis of the test system, the system acquires the pressure value and the displacement value at the current moment in real time, and performs serialization, when the acquired pressure value is greater than 90% of the predicted pressure value for the first time, the system enters a judging maximum period mode, when the acquired pressure value is smaller than 90% of the predicted pressure value again, the maximum value from the current moment to the previous moment is acquired, meanwhile, the data serial number at the moment is recorded, the pressure value from the serial number to the ending serial number at the previous moment is completely indexed, the minimum value is acquired, the serial number of the data is recorded, the pressure value and the displacement value from the minimum serial number to the maximum serial number are taken out, the test data required by the cyclic loading at the current time are output, the next data are re-serialized, and the analysis processing result is output;
(4) And stopping collecting and storing after the experiment is ended, and deriving experimental data.
The invention provides an automatic test system for mechanical properties of a superconducting conductor. The structure composition, the basic principle, the functional characteristics and the advantages of the invention are shown, the invention is provided according to a superconducting conductor mechanical property measurement system, but the invention has certain expansibility and is suitable for a circulating acquisition control system.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the structures of this invention and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the invention or from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. An automatic test system for mechanical properties of a superconducting conductor is characterized in that: the test system consists of a software part and a hardware part, wherein the hardware part comprises a pressure control unit, a heating control unit, a liquid level control unit, a displacement measurement unit and an acquisition control unit; the software part consists of an FPGA acquisition program, an RT data processing program and an upper computer control program;
the pressure control unit comprises a mechanical testing machine, a pressure sensor and a pressure dividing module; the pressure sensor is arranged on a pressure transmission column of the mechanical testing machine and used for detecting the pressure applied by the mechanical testing machine; the pressure transmission column comprises an upper transmission column and a lower transmission column; the pressure dividing module is connected with the pressure sensor and is used for dividing the pressure of the pressure transmission column on the sample;
the heating control unit comprises a heating resistor, a heating disc, a temperature sensor and a temperature monitor, wherein the heating disc is provided with an upper heating disc layer and a lower heating disc layer, the lower heating disc layer is provided with a groove, the heating resistor is embedded into the groove of the lower heating disc layer and is used for generating heat, the upper heating disc is arranged between an upper transmission column and a voltage dividing module of the mechanical testing machine, the lower heating disc layer is arranged on a lower transmission column of the mechanical testing machine and is positioned on the upper side of the pressure sensor, the temperature sensor is placed in the heating disc layer and is used for detecting the temperature of the heating disc layer, and the temperature monitor is used for adjusting the temperature according to a set value in real time and keeping constant temperature;
the liquid level control unit comprises a low-temperature control valve, a liquid nitrogen sensor, a liquid level monitor and an electromagnetic valve controller; the low-temperature control valve controls the opening and closing of the liquid nitrogen input channel, the liquid level sensor is used for measuring the liquid level of liquid nitrogen, the liquid level monitor is used for displaying and detecting the real-time liquid level of the liquid nitrogen and sending an opening and closing instruction to the electromagnetic valve controller, and the electromagnetic valve controller controls the opening and closing of the electromagnetic valve according to the instruction of the liquid level monitor;
the displacement measuring unit comprises a low-temperature extensometer and a voltage source, wherein the low-temperature extensometer is arranged on the experimental armor and is used for measuring the displacement change of the experimental armor under pressure, and the voltage source is used for providing stable voltage for the low-temperature extensometer and the pressure sensor;
the acquisition control unit comprises an upper computer, a CompactRIO controller and an accessory acquisition board card;
the FPGA acquisition program is used for acquiring the applied force and the experimental armor strain displacement of the mechanical experiment machine;
the RT data processing program is used for processing data acquired by the FPGA layer and processing pressure, cycle times, energy and displacement information;
the upper computer control program is a man-machine interaction program and an interaction program with the temperature controller and the liquid level controller, and is used for displaying displacement and pressure change, setting the adjustment range of temperature and liquid level and sending out relevant control instructions of an operator;
the FPGA acquisition program and the RT data processing program adopt a FIFO protocol for data transmission, and the RT data processing program and the upper computer control program adopt a network variable and a network flow protocol for data transmission.
2. The automated superconducting conductor mechanical property testing system of claim 1, wherein: the temperature controller is connected with the compactRIO controller by adopting an RS485 communication protocol, and the liquid level controller is connected with the compactRIO controller by adopting a TCP/IP communication protocol.
3. The automated superconducting conductor mechanical property testing system of claim 1, wherein: the heating control unit is used for heating the pressure sensor, and ensures that the pressure sensor works in a temperature range of 15-30 ℃.
4. The automated superconducting conductor mechanical property testing system of claim 3, wherein: the heating resistor in the heating control unit is annular in appearance, the heating disc is hollow cylinder-shaped, and the inner annular wall is provided with threads.
5. The automated superconducting conductor mechanical property testing system of claim 4, wherein: and a gap between the heating resistor and the groove of the lower heating disc is filled with soldering tin, and the upper heating disc and the lower heating disc are sealed by welding.
6. The automated superconducting conductor mechanical property testing system of claim 1, wherein: the liquid level control unit is used for regulating and controlling the height of the low-temperature liquid, when the liquid level is lower than a system set value, the electromagnetic valve is opened to supplement liquid, and when the liquid level is higher than the system set value, the liquid supplement is stopped, so that the liquid is always in a low-temperature medium in the testing process.
7. The automated superconducting conductor mechanical property testing system of claim 1, wherein: the low-temperature extensometer adopts a Nile ultra-low-temperature extensometer, 4 low-temperature strain gages are arranged on two side bridge arms of the low-temperature extensometer, and strain changes on the bridge arms are accurately measured in a temperature region of 4.2K-77K.
8. The automated superconducting conductor mechanical property testing system of claim 1, wherein: the FPGA acquisition program and the RT data processing program run on the compactRIO controller, and the upper computer control program runs on the PC end; the FPGA acquisition program supports shunt calibration and offset calibration and sampling frequency adjustment for displacement and pressure measurement; the RT data processing program can distinguish the cycle times, automatically judge the pressure displacement maximum value of each cycle, and calculate the energy of each cycle; the data storage file of the RT data processing program is in a TDMS format, and the data is stored in an external storage container of the compactRIO controller.
9. The automated superconducting conductor mechanical property testing system of claim 8, wherein: the RT data processing program comprises an upper computer message receiving and transmitting process, an RT end message processing process, a data analysis processing process, a data storage process and an FPGA end message receiving and transmitting process.
10. A method of implementing an automated test system for mechanical properties of a superconducting conductor according to any one of claims 1-9, characterized by: the method comprises the following steps:
(1) Assembling the components of the test system;
a. placing a heating resistor in a groove of a lower heating disc, filling a gap with soldering tin, welding and sealing an upper heating disc and a lower heating disc, and simultaneously connecting the heating resistor with a temperature monitor;
b. embedding a temperature sensor into the upper heating plate, and simultaneously connecting a signal wire of the temperature sensor into a temperature controller;
c. placing a liquid level sensor in a measuring container, vertically placing the liquid level sensor and fixing the liquid level sensor by adopting a bracket, and simultaneously connecting the liquid level sensor with a liquid level monitor;
d. the low-temperature control valve is arranged at the low-temperature medium output end and is connected with the corresponding control signal line and the liquid level controller;
e. connecting a temperature monitor with a liquid level controller and a CompactRIO controller;
f. connecting a low-temperature extensometer with an accessory module of the CompactRIO controller;
(2) Setting related parameters of an FPGA acquisition program, a temperature monitor, a liquid level monitor and a mechanical testing machine;
(3) Starting a test, and collecting, analyzing and storing related data:
a. opening a test system acquisition page to acquire signals and simultaneously opening a data storage function;
b. starting a mechanical testing machine and starting testing;
c. analyzing the data of the test system, collecting the pressure value and the displacement value at the current moment in real time by the test system, serializing the pressure value and the displacement value, entering a judging maximum period mode when the collected pressure value is larger than 90% of the predicted pressure value for the first time, obtaining the maximum value from the current moment to the previous moment when the collected pressure value is smaller than 90% of the predicted pressure value again, recording the data serial number at the moment, fully indexing the pressure value of the serial number to the ending serial number at the previous moment, obtaining the minimum value, recording the serial number of the data, taking out the pressure value and the displacement value from the minimum serial number to the maximum serial number, outputting the test data required by the current cyclic loading, and re-serializing the lower group data and outputting the analysis processing result;
(4) And stopping collecting and storing after the experiment is ended, and deriving experimental data.
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