CN113029758B - Gas heating device capable of realizing accurate temperature control for Hopkinson bar high-temperature experiment - Google Patents
Gas heating device capable of realizing accurate temperature control for Hopkinson bar high-temperature experiment Download PDFInfo
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- CN113029758B CN113029758B CN202110338949.2A CN202110338949A CN113029758B CN 113029758 B CN113029758 B CN 113029758B CN 202110338949 A CN202110338949 A CN 202110338949A CN 113029758 B CN113029758 B CN 113029758B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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Abstract
The invention provides a fuel gas heating device capable of realizing accurate temperature control for a Hopkinson bar high-temperature experiment, which comprises a heating system, a fuel system and a control system, wherein the heating system is connected with the fuel system through a pipeline; the heating system comprises a heating outer heat-preservation bin, and the heating system comprises a gas-fired heating inner core group, a heating outer heat-preservation bin and a leveling base; the fuel system comprises a test gas bottle and an electronic pneumatic valve, wherein the test gas bottle is connected with the electronic pneumatic valve, and the electronic pneumatic valve is simultaneously connected with the PLC and the heating system; the control system is a PLC program logic controller and is respectively connected with the heating system and the fuel system; the invention controls the temperature change in the heating bin to be +/-1 ℃, improves the accuracy of a Hopkinson high-temperature experiment, and simultaneously, due to the addition of the fixing device of the upper cavity of the film-containing chamber, the heating and impact test of a test piece are carried out at the same position, thereby realizing the synchronous control of the system and the rapid and accurate data processing.
Description
Technical Field
The invention relates to a gas heating device, in particular to a gas heating device capable of realizing accurate temperature control for a Hopkinson bar high-temperature experiment, belongs to the technical field of impact dynamics experiments, and relates to an SHPB (split harmonic vibration suppression) experiment technology.
Background
In a Hopkinson bar high-temperature experiment, the traditional experiment device is suitable for the experiment of a single test piece, a temperature sensor needs to be accurately installed on the test piece in a closed heating furnace body, and the installation process is very difficult; in addition, the incident rod and the transmission rod are heated in the furnace body of the heating furnace in the test, and the local plastic stress at the tail end of the rod piece is generated by the temperature change, so that the stress wave can not be accurately transmitted to the test piece. The existing test technology has certain defects and deficiencies, namely, in the test of a large number of test pieces with multiple sizes, a temperature sensor is difficult to install at an accurate position, the working efficiency is extremely low, the temperature on the surface of the test piece is difficult to accurately measure, an incident rod and a transmission rod are heated in a furnace body of a heating furnace, a temperature gradient field is generated to cause inaccurate stress wave transmission, the domestic existing Hopkinson high-temperature test device is mostly electrically heated, the heating speed is low, the efficiency is low, and the problems of inaccurate temperature compensation and the like in temperature control precision, non-uniformity in temperature field and inaccurate temperature compensation exist.
Disclosure of Invention
The invention aims to provide a gas heating device capable of realizing accurate temperature control for a Hopkinson bar high-temperature experiment in order to realize rapid heating and accurate temperature control of a test piece of the Hopkinson high-temperature experiment.
The purpose of the invention is realized as follows:
a fuel gas heating device capable of realizing accurate temperature control for Hopkinson bar high-temperature experiments comprises a heating system, a fuel system and a control system; the heating system comprises a heating outer heat-preservation bin, and the heating system comprises a gas-fired heating inner core group, a heating outer heat-preservation bin and a leveling base; the fuel system comprises a test gas bottle and an electronic pneumatic valve, wherein the test gas bottle is connected with the electronic pneumatic valve, and the electronic pneumatic valve is simultaneously connected with the PLC and the heating system; the control system is a PLC (programmable logic controller) and is respectively connected with the heating system and the fuel system; the gas-fired heating inner core group comprises a temperature sensing probe device which can accurately measure and control temperature and can automatically pop out the upper cavity containing the membrane chamber, and the gas-fired heating inner core is connected into the left and right horizontally symmetrical access ports of the heating inner core; a fixing device capable of positioning the upper cavity of the film-containing chamber of the test piece is connected through a lower interface of the gas heating inner core; adhere to array overall arrangement temperature-sensing ware on gas formula heating inner core, gas formula inner core group sets up in the storehouse that keeps warm outside the heating, and storehouse and gas formula inner core that keeps warm outside the heating set up 5 gas nozzle joint and insert the mouth, be 35, 90, 145, 225 and 315 respectively, gas nozzle joint inserts adaptation gas nozzle, keeps warm storehouse and gas formula inner core 270 positions setting outside the heating and contains membrane chamber epicoele fixing device and insert the mouth.
The temperature-measuring and temperature-controlling probe device capable of accurately measuring and controlling temperature and automatically popping out the upper cavity containing the membrane chamber comprises an upper cavity containing the membrane chamber based on PLC control, an inserting and popping type buckling part and an embedded temperature sensing device;
the fuel system pneumatic valve is controlled based on an electric signal of a PLC (programmable logic controller);
and the inner wall of the heating outer heat-preservation bin is attached with a Ti-doped Ag/TiO2 composite membrane.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the problems in the prior art, the invention provides a gas heating device capable of realizing accurate temperature control for a Hopkinson bar high-temperature experiment, wherein the temperature change in a heating bin is controlled to +/-1 ℃ through a gas heating inner core containing a membrane chamber upper cavity temperature sensing probe device and an attached array type temperature sensor, and the control is carried out by combining a PLC (programmable logic controller) program logic controller, so that the accuracy of the Hopkinson high-temperature experiment is improved, and meanwhile, due to the addition of a fixing device containing a membrane chamber upper cavity, the heating and impact test of a test piece are carried out at the same position, and the system synchronous control and the rapid and accurate data processing are realized.
Drawings
FIG. 1 is a schematic view of a heating system, a control system and a gas system main body;
FIGS. 2a-b are front and side views of a heating system;
fig. 3a-b are schematic diagrams of a gas system and a control system PLC program logic controller.
In the figure: 1-heating external thermal insulation bin, 2-heating external thermal insulation bin inner wall attached Ti-doped Ag/TiO2 composite membrane, 3-replaceable heating external thermal insulation bin cover adapted to Hopkinson rod members with different diameters, 4-filling alumina ceramic fiber layer, 5-gas type heating inner core with replaceable adaptive test piece size, attached array layout temperature sensor, 6-accurate temperature measurement and temperature control and automatic ejection type temperature sensing probe device containing upper chamber of membrane chamber, 7-fixing device capable of positioning upper chamber of membrane chamber of test piece, 8-replaceable adaptive test piece size fixing device fixing head, 9-detachable gas nozzle joint, 10-adaptive gas nozzle, 11-leveling base, 12-leveling screw, 13-test piece, 14-horizontal symmetry place set probe access, 15-fixed support interface, 16-test gas bottle, 17-electronic gas valve based on PLC control, 18-PLC program logic controller, 19-PLC liquid crystal display screen, 20-PLC temperature setting and fixed height setting button, 21-PLC return button, 22-input PLC output wiring port.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
A gas heating device for Hopkinson bar high-temperature experiment can realize accurate temperature control. Fig. 1, the heating system, the control system and the fuel system. As shown in figures 2a-b and 3a-b, the heating system comprises a heating outer heat-preservation bin 1, and a Ti-doped Ag/TiO2 composite film 2 is attached to the inner wall of the heating outer heat-preservation bin; a heating outer heat preservation bin cover 3 which can be adapted to Hopkinson rod pieces with different diameters; an alumina ceramic fiber layer 4 is filled between the inner wall of the heat preservation bin and the fuel gas heating inner core; a gas type heating inner core which can be changed to adapt to the size of a test piece is attached with an array layout temperature sensor 5; the temperature measuring and controlling device is accurate and can automatically pop up the temperature sensing probe device 6 on the upper cavity of the film-containing chamber; a fixing device 7 capable of positioning the upper cavity of the film-containing chamber of the test piece; a detachable gas nozzle joint 9 and an adapted gas nozzle 10, and a leveling base 11. The gas type heating inner core is attached with an array layout temperature sensor, and a probe access port 14 and a test piece fixing support interface 15 are arranged at the left and right horizontal symmetry positions. The fuel system comprises a test gas bottle 16 and an electronic pneumatic valve 17 based on PLC control. The electro-pneumatic valve 16 can realize the functions of automatically opening and closing air inlet and automatically adjusting air inlet amount under the control of a PLC. The control system is a PLC program logic controller 18 which is provided with a display screen 19 and a temperature setting adjusting button 20. The gas-fired heating inner core group comprises a temperature-sensing probe device which can accurately measure and control temperature and can automatically pop out the upper cavity of the film-containing chamber, and is connected with the gas-fired heating inner core 5 through the left and right horizontally symmetrical access ports 14 of the heating inner core; the fixing device 7 capable of positioning the upper cavity of the film-containing chamber of the test piece is accessed through a lower interface 15 of the gas heating inner core. The array layout temperature sensor is attached to the gas heating inner core. The gas formula inner core group sets up in heating outer heat preservation storehouse 1, and storehouse and gas formula inner core that keeps warm outside the heating set up 5 gas nozzle joint and insert the mouth, are 35 °, 90 °, 145 °, 225 ° and 315 ° respectively, and gas nozzle connects and inserts the adaptation gas nozzle. An access port 15 of a fixing device of an upper cavity of the film-containing chamber is arranged at 270 degrees of the heating outer heat-preservation bin and the gas type inner core. The test gas bottle 16 is connected with the electronic pneumatic valve 17, and the electronic pneumatic valve is simultaneously connected with the PLC and the heating system.
When the device is specifically implemented, a heating system, a gas system and a control system are respectively connected. A heating system is placed on an experiment table, the whole height of the heating system is adjusted by using a leveling base 11 and leveling screws 12, a Hopkinson incident rod and a transmission rod are pushed in, and the position of a test piece 13 is positioned. The PLC program logic controller 18 is started, the fixed height value of the test piece fixing device 7 is set, and the input is confirmed by pressing the confirm button 21. The fixing device 7 is ejected slowly to fix the test piece. At this time, a Hopkinson incident rod and a transmission rod are respectively pushed out, the temperature setting button 20 is pressed on a PLC program logic controller to input the test required working condition temperature, and the confirming button 21 is pressed to confirm the input. 5 adapted gas nozzles 10 are inserted into 5 detachable gas nozzle connections 9, respectively. And opening the switches of the test gas bottle 16 and the electronic pneumatic valve 17, inputting and igniting gas, and heating the gas heating inner core 5. At the moment, the temperature measurement and control are accurate, the temperature sensing probe device 6 can automatically pop up to the upper cavity of the film-containing chamber and slowly push in to approach the test piece 13 based on the control of the PLC 18, and the temperature of the test piece is detected. The array layout temperature sensor attached to the gas heating inner core is used for carrying out heat radiation control on a heating temperature field of the test piece based on the control of the PLC. For example, the temperature of the test working condition is set to be 200 ℃, the temperature rise time is set to be 2min, and the temperature rise rate is set to be 1.67 ℃/s. When the average temperature of the gas heating inner core reaches 150 ℃, the distribution condition of the thermal radiation field of the heating bin is fed back through the array layout temperature sensor, the PLC adjusts and controls the electronic pneumatic valve to reduce the output quantity of gas, the temperature heating rate is adjusted to be 0.8 ℃/s, and the temperature rising time is 60s. At the moment, the PLC closes the electronic pneumatic valve, the heating bin enters a heat preservation stage, and the temperature field is gradually balanced, uniform and slowly heated to 200 ℃. When the temperature of the test piece reaches 200 ℃, the temperature-sensitive probe device 6 is ejected out slowly and automatically, the Hopkinson incident rod and the transmission rod are pushed in at the moment, the experiment is completed, and the data collector is used for recording the experiment result.
A gas heating method for realizing accurate temperature control in a Hopkinson bar high-temperature experiment adopts the device, and comprises the following steps: array type temperature sensors and accurate temperature measurement and temperature control of a heating system can automatically pop out a film-containing chamber upper cavity temperature sensing probe device, in the process of heating a test piece, the air inlet rate of an electronic pneumatic valve is adjusted through a PLC (programmable logic controller) of a control system, the temperature field temperature gradient distribution condition in a heating bin around the test piece is adjusted, the air inlet rate is further adjusted or air inlet is stopped through a PLC (programmable logic controller), the stability of the heating rate is ensured, and through a preset temperature compensation logic algorithm, the film-containing chamber upper cavity temperature sensing probe device is automatically popped out when the test piece is heated, a Hopkinson incident rod and a transmission rod are pushed at the moment, a button pops down the test piece fixing device, an impact test is completed, so that the accurate heating of the test piece is realized, and the experiment efficiency is improved.
In summary, the following steps: the invention discloses a gas heating device capable of realizing accurate temperature control for a Hopkinson bar high-temperature experiment. The apparatus includes a heating system, a fuel system, and a control system. The heating system comprises a heating outer heat-preservation bin, and an Ag/TiO2 composite film doped with Ti is attached to the inner wall of the heating outer heat-preservation bin; the heating outer heat-preservation bin cover can be adapted to Hopkinson rod pieces with different diameters; an alumina ceramic fiber layer is filled between the inner wall of the heat preservation bin and the fuel gas heating inner core; a gas type heating inner core which is matched with the size of a test piece can be replaced, and an array layout temperature sensor is attached to the inner core; the temperature measuring and controlling device can accurately measure and control temperature and automatically pop up a temperature sensing probe device on the cavity containing the membrane chamber; the fixing device can position the upper cavity of the film-containing chamber of the test piece; the detachable gas nozzle joint, the adaptive gas nozzle and the leveling base. Array layout temperature sensors are attached to the gas-fired heating inner core, and probe access ports and fixed support interfaces are arranged at the left and right horizontal symmetrical positions. The fuel system comprises a gas bottle for testing and an electronic pneumatic valve based on PLC control. The electronic pneumatic valve can realize the functions of automatically opening and closing air inlet and automatically adjusting air inlet amount under the control of the PLC. The control system is a PLC program logic controller. The invention analyzes the defects of the prior relevant experimental technology and improves the Hopkinson bar test scheme comprehensively. This device passes through the PLC controller, under the experimental temperature operating mode of settlement test piece, but utilize PLC editing algorithm and electronic pneumatic valve, adnexed array temperature sensor and temperature sensing probe device on cooperation gas heating inner core and the inner core, accurate control heat source and uniform temperature field temperature reach the accurate accuse temperature of test piece, the regional incident pole of heat source has also been avoided simultaneously and the transmission pole heats the problem that produces local plastic stress simultaneously, the accuracy of hopkinson pole high temperature experiment has been guaranteed.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the detailed description is given with reference to the embodiments of the present invention, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which shall be covered by the protection scope of the claims of the present invention.
Claims (1)
1. A fuel gas heating device capable of realizing accurate temperature control for Hopkinson bar high-temperature experiments is characterized by comprising a heating system, a fuel system and a control system; the heating system comprises a heating outer heat-preservation bin, and the heating system comprises a gas-fired heating inner core group, a heating outer heat-preservation bin and a leveling base; the fuel system comprises a test gas bottle and an electronic pneumatic valve, wherein the test gas bottle is connected with the electronic pneumatic valve, and the electronic pneumatic valve is simultaneously connected with the PLC and the heating system; the control system is a PLC program logic controller and is respectively connected with the heating system and the fuel system; the gas-fired heating inner core group comprises a temperature sensing probe device which can accurately measure and control temperature and can automatically pop out the upper cavity containing the membrane chamber, and the gas-fired heating inner core is connected into the left and right horizontally symmetrical access ports of the heating inner core; a fixing device capable of positioning the upper cavity of the film-containing chamber of the test piece is connected through a lower interface of the gas heating inner core; the array layout temperature sensor is attached to the gas type heating inner core, the gas type inner core group is arranged in the heating outer heat insulation bin, 5 gas nozzle connector access ports are arranged in the heating outer heat insulation bin and the gas type inner core, the gas nozzle connector access ports are respectively 35 degrees, 90 degrees, 145 degrees, 225 degrees and 315 degrees, the gas nozzle connector is connected with an adaptive gas nozzle, and 270-degree positions of the heating outer heat insulation bin and the gas type inner core are provided with a membrane chamber upper cavity fixing device access port; the temperature sensing probe device capable of accurately measuring and controlling temperature and automatically popping up the upper cavity of the membrane-containing chamber comprises the upper cavity of the membrane chamber based on PLC control, an inserted pop-up buckle part and an embedded temperature sensing device; the fuel system pneumatic valve is controlled based on an electric signal of a PLC (programmable logic controller); and a Ti-doped Ag/TiO2 composite membrane is attached to the inner wall of the heating outer heat-preservation bin.
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