CN116273494A - In-situ heating temperature control method under high rotation speed and high temperature effect - Google Patents
In-situ heating temperature control method under high rotation speed and high temperature effect Download PDFInfo
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- CN116273494A CN116273494A CN202310064615.XA CN202310064615A CN116273494A CN 116273494 A CN116273494 A CN 116273494A CN 202310064615 A CN202310064615 A CN 202310064615A CN 116273494 A CN116273494 A CN 116273494A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B15/00—Other accessories for centrifuges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B7/00—Elements of centrifuges
- B04B7/08—Rotary bowls
- B04B7/18—Rotary bowls formed or coated with sieving or filtering elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses an in-situ heating temperature control method under the action of high rotating speed and high temperature. When the spindle of the centrifuge rotates, a temperature load is applied to the test sample through the induction heating system while the spindle of the centrifuge rotates, wherein the application of the temperature load comprises the application of a constant and uniform temperature field according to a uniform temperature heating mode, the application of a periodically changing alternating temperature field according to a periodically changing alternating temperature heating mode, and the application of a temperature field with a fixed range and gradient change according to a heating mode of a temperature gradient. The invention solves the problem that the radiation heating at high rotating speed can only heat the whole sample, and can provide tests at different temperatures and different centrifugal forces on one sample; solves the technical limitations that the temperature of the radiation heating at the current high rotating speed cannot exceed 800 ℃ and the temperature of the radiation heating at the current high rotating speed cannot be changed rapidly.
Description
Technical Field
The invention relates to a centrifuge heating temperature control method in the field of metal material in-situ heating, in particular to a centrifuge in-situ heating temperature control method for metal materials under the action of high rotating speed and high temperature.
Background
National standards GB/T38822-2020 "method for creep-fatigue test of Metal Material" and GB/T6825.1-2008 "static uniaxial tester", part 1: the test methods of the mechanical properties of the metal materials are specified in the test and calibration of the force measuring system of the tensile force and/or pressure testing machine, but the test environments specified by the standards are 1G (G=9.8m/s 2), so that the research of the mechanical properties of the metal materials can be satisfied. However, in turbine propulsion systems, such as aeroengines, space engines, industrial and naval gas turbines, and automotive and train turbochargers, the critical components of the power system, such as compressor blades, fan blades, turbine rotor blades, etc., are in a high-speed rotation state during normal operation, i.e., the service environment is typically a centrifugal hypergravity environment.
The turbine propulsion system is generally a turbine power device which converts heat energy generated by burning fuel into mechanical energy by driving a turbine through thermal expansion work on a working blade by a guide blade, and the turbocharger is a power device which converts waste heat of an engine into mechanical energy by utilizing thermal expansion work on the turbine by using waste gas of a diesel (gasoline) engine. The turbine working blades of the power devices rotate around the axis of the engine at a high speed during service, and the power devices are used for expanding and doing work by the fuel gas and converting potential energy and heat energy of the fuel gas into mechanical work of the rotor, so that the loads born by the turbine working blades during service comprise aerodynamic force, centrifugal force and thermal load. The centrifugal force generated by high-speed rotation belongs to volume force, so that radial tensile stress is mainly generated on the blade, and torsional stress is generated on the blade with a torsional structure. If the stacking line of the blade does not completely coincide with the radial line, the centrifugal force also causes bending stress to the blade. The thermal stresses generated by the thermal load are closely related to the temperature gradient and geometric constraints of the blade, and the greater the temperature gradient of the blade, the greater the thermal stresses. However, the key material mechanical property data for designing the turbine blade of the turbine propulsion system at present are all from the mechanical property data of the material in static and uniaxial stress states obtained by testing standard samples through the testing machines such as endurance, creep, fatigue and the like under the 1G condition. Although the mechanical property data of the standard sample can provide design basis for the strength design of the turbine blade of the turbine propulsion system to a certain extent, the complicated stress state of the blade is different from that of the standard sample because the blade has a complicated geometric shape, the mechanical property data of the material obtained by the standard sample does not consider the influence of high rotation speed, the geometric structure of the blade and the like on the structural reliability of the blade, and the mechanical property data of the material cannot be directly used for evaluating the service life of the turbine blade.
Disclosure of Invention
Aiming at the defect of the current 1G metal material static mechanical property test, and aiming at the fact that no in-situ heating device and intelligent temperature control technology are suitable for the metal material mechanical property test process under the action of high rotating speed and high temperature, the invention provides an in-situ heating temperature control method capable of applying in-situ heating temperature to a metal material under the high rotating speed environment, and solves the key problems of in-situ heating and temperature control in the metal material mechanical property test process under the action of high rotating speed and high temperature.
In-situ heating of a metal material in a high-rotation-speed environment refers to that in the mechanical property test process of the metal material or a part, the test material or the part rotating at a high speed is always in an in-situ heating state until the test is finished.
The high temperature refers to the heating temperature applied to the designated area of the sample in the experiment is not lower than 500 ℃, and the duration of in-situ heating is not lower than the test time.
The high rotating speed refers to that the highest rotating speed of the centrifugal machine is not lower than 5000 revolutions/min in the experiment.
The invention adopts the technical scheme that:
when the spindle of the centrifugal machine rotates, the induction heating system applies temperature load to the test sample, wherein the temperature load comprises a constant and uniform temperature field applied according to a uniform temperature heating mode, a periodically-changing alternating temperature field applied according to a periodically-changing alternating temperature heating mode and a temperature field with a fixed range and gradient change applied according to a temperature gradient heating mode.
The uniform temperature heating mode specifically comprises the following steps: the distance h between the standard moment section of the test sample and the upper induction coil and the lower induction coil is kept the same, and the current power and the current alternating frequency of the upper induction coil and the lower induction coil are kept unchanged in the t time, so that a constant and uniform temperature field is applied to the standard moment section.
The periodically-changing alternating-temperature heating mode specifically comprises the following steps: the distance h between the target moment section of the test sample and the upper induction coil and the lower induction coil is respectively kept the same, the current alternating frequency of the upper induction coil and the lower induction coil is unchanged, but the current power of the upper induction coil and the lower induction coil is periodically changed in the time T, so that an alternating temperature field which is formed by applying the temperature T1 in the time T1 and applying the temperature T2 in the time T2 and is continuously and periodically repeatedly and alternately changed is provided for the target moment section.
The heating mode of the temperature gradient is specifically as follows: processing a standard moment section of the test sample into an arc with a radius of R), wherein the lowest end of the arc of the standard moment section is respectively kept the same as the distance h between the upper induction coil and the lower induction coil, and the current power and the current alternating frequency of the upper induction coil and the lower induction coil are kept unchanged in t time; thus, a temperature field of a temperature gradient is applied to the target section of the test specimen.
The method adopts an in-situ heating temperature control device, and the device comprises a sample chuck, an induction heating system, a circulating water cooling system and a temperature control system; the sample chuck is coaxially arranged on the main shaft of the centrifugal machine and synchronously rotates along with the main shaft of the centrifugal machine, the sample chuck is provided with a test sample, the induction heating system is coaxially arranged on the centrifugal machine and does not rotate along with the main shaft of the centrifugal machine, the induction heating system is connected with the circulating water cooling system, and the temperature control system is respectively connected with the circulating water cooling system and the test sample.
The sample chuck comprises a disc body, clamping grooves and a flange, wherein the flanges are coaxially arranged at two ends of the center of the disc body, the disc body is coaxially and fixedly connected with a spindle of a centrifugal machine through the flanges, a plurality of clamping grooves are formed in the periphery of the disc body along the circumferential direction, the clamping grooves are arranged at intervals along the circumferential direction, and each clamping groove is used for mounting a test sample.
The test sample is strip-shaped and comprises a mass block, a standard moment section, a bearing section and an assembling tenon which are sequentially connected, wherein the mass block, the standard moment section, the bearing section and the assembling tenon are sequentially arranged along the strip-shaped test sample, and the assembling tenon is embedded in a clamping groove of the sample chuck.
The induction heating system comprises an upper induction coil, an upper fixing plate, a lower induction coil and a lower fixing plate; the upper fixing plate and the lower fixing plate are respectively and fixedly arranged in parallel at an upper-lower interval, and a sample chuck is arranged in the interval between the upper fixing plate and the lower fixing plate; the annular upper induction coil and the annular lower induction coil are respectively fixed on the bottom surface of the upper fixing plate, the lower fixing plate and the top surface through the upper induction coil insulating layer and the lower induction coil insulating layer.
The circulating water cooling system comprises a pipeline assembly, a circulating water inlet pipe, a circulating water outlet pipe, a positive electrode, an inner insulating sleeve, a metal sleeve, a negative electrode, a copper pipe, an insulating pressing sleeve, a fixing flange, an insulating pressing sleeve, a compressing round nut, a sealing piece, an electrode insulating pressing sleeve, an external water outlet pipe, an external positive electrode plate, an external water inlet pipe and an external negative electrode plate; an insulating pressing sleeve used for insulating the copper pipe is sleeved outside the copper pipe, and a metal sleeve is sleeved outside the insulating pressing sleeve; the middle part of the metal sleeve is sealed and sleeved in a central hole of a fixed flange through an insulating pressing sleeve and a sealing ring for a shaft, the fixed flange is fixed on an experimental cavity cover of the centrifugal machine, and two ends of the copper pipe, the insulating pressing sleeve and the metal sleeve are respectively fixed and sealed through an inner insulating sleeve and a sealing piece; one end of the copper pipe passes through the inner insulating sleeve and then is coaxially butted with the circulating water outlet pipe, and a positive electrode is arranged at the end part of one end of the copper pipe, which passes through the inner insulating sleeve; the external positive electrode plate is electrically connected with the copper pipe through the electrode insulation pressing sleeve, so that the positive electrode is directly connected with the external positive electrode plate after passing through the copper pipe; the other end of the copper pipe is in butt joint with the external water outlet pipe, so that the circulating water outlet pipe directly circulates through the copper pipe and the external water outlet pipe; an annular pipeline gap is formed between the insulating pressing sleeve and the metal sleeve and is used as a water inlet channel, one end of the water inlet channel is communicated and connected with a circulating water inlet pipe through a metal pipeline, and a negative electrode is arranged near the end part of the circulating water inlet pipe; the external negative electrode plate is electrically connected with the metal sleeve through the compression round nut, so that the negative electrode is electrically connected with the external negative electrode plate after sequentially passing through the metal pipeline and the metal sleeve; the metal sleeve is provided with a through groove on the pipe wall at one end of the connecting sealing piece, and the through groove is in flow connection with the external water inlet pipe, so that the flow water inlet pipe sequentially passes through the metal pipe, the water inlet channel and the through groove and then flows with the external water inlet pipe;
the pipeline assembly comprises a heating water inlet pipe, a water inlet pipe sealing sleeve, a heating water outlet pipe and a water outlet pipe sealing sleeve; one ends of the heating water inlet pipe and the heating water outlet pipe are respectively connected with the circulating water inlet pipe and the circulating water outlet pipe through the water inlet pipe sealing sleeve and the water outlet pipe sealing sleeve, and the other ends of the heating water inlet pipe and the heating water outlet pipe are respectively communicated with the inner cavity environments where the upper induction coil and the lower induction coil in the induction heating system are located.
The temperature control system comprises a thermocouple, a thermocouple extension line, a high-speed slip ring, a data acquisition module, a data conversion transmission module and a high-frequency alternating current power cabinet; the upper induction coil and the lower induction coil of the induction heating system are respectively and fixedly provided with a thermocouple on the surface of a test sample corresponding to the upper induction coil and the lower induction coil, the thermocouples are connected with a data acquisition module through thermocouple extension lines and high-speed sliding rings, and the data acquisition module is in communication connection with a high-frequency alternating current power cabinet through a data conversion transmission module and is electrically connected with an external positive electrode plate and an external negative electrode plate of a circulating water cooling system.
The beneficial effects of the invention are as follows:
(1) The invention solves the limit that the radiation heating can only heat the whole sample at the high rotating speed at present, and the invention heats the appointed area or position of the sample at the high rotating speed by changing the diameter of the inductive coil;
(2) According to the invention, the designated area or position of the sample is heated at a high rotating speed by changing the diameter of the inductive coil, so that a temperature gradient can be applied to the sample along the hypergravity direction, and test conditions under different temperatures and different centrifugal forces are provided on one sample;
(3) The invention solves the problem that the radiation heating temperature cannot exceed 800 ℃ at the current high rotating speed, and the invention can increase the local heating temperature of the test part to 1200 ℃ at the high rotating speed;
(4) The invention solves the technical limitation that the rapid temperature alternation can not be realized by the radiation heating at the high rotating speed at present, and can apply constant or alternating temperature load to the test part by controlling the induction heating power through a program at the high rotating speed.
Drawings
Fig. 1 is a schematic structural view of a sample chuck 1;
FIG. 2 is a schematic structural diagram of test specimen 1.1;
fig. 3 is a schematic structural view of the induction heating system 2;
fig. 4 is a schematic structural view of the circulating water cooling system 3;
fig. 5 is a schematic diagram of the temperature control system 4;
FIG. 6 is a schematic diagram of the structure of a test sample 1.1;
FIG. 7 is a schematic diagram of the structure of a test sample 1.1;
FIG. 8 is a schematic diagram of the structure of a test sample 1.1;
FIG. 9 is a schematic diagram of the installation of the sample chuck 1, the induction heating system 2 on a centrifuge;
FIG. 10 is a process roadmap for a heating implementation one;
FIG. 11 is a process roadmap for heating implementation two;
fig. 12 is a process roadmap for heating implementation three.
In the figure:
sample chuck 1: test sample 1.1, clamping groove 1.2 and flange 1.3;
1.1.1 parts of mass blocks, 1.1.2 parts of standard moment, 1.1.3 parts of bearing, and 1.1.4 parts of assembling tenons;
induction heating system 2: an upper induction coil 2.1, an upper induction coil insulating layer 2.2, an upper fixing plate 2.3, an upper fixing screw rod 2.4, a lower induction coil 2.5, a lower induction coil insulating layer 2.6, a lower fixing plate 2.7, a lower fixing screw rod 2.8, a connecting rod 2.9, a screw cap 2.10, a heating water inlet pipe 2.11, a water inlet pipe sealing sleeve 2.12, a heating water outlet pipe 2.13 and a water outlet pipe sealing sleeve 2.14;
circulating water cooling system 3: a circulation water inlet pipe 3.1, a connecting nut 3.2, a circulation water outlet pipe 3.3, a connecting nut 3.4, a positive electrode 3.5, an inner insulating sleeve 3.6, a negative electrode 3.8, a copper pipe 3.9, an insulating pressing sleeve 3.10, a fixing flange 3.11, a fixing screw 3.12, a shaft sealing ring 3.13, an insulating pressing sleeve 3.14, a pressing round nut 3.15, a pressing nut 3.16, an insulating piece 3.17, a sealing piece 3.18, an electrode insulating pressing sleeve 3.19, a sealing nut 3.20, an external water outlet pipe 3.21, an external positive electrode plate 3.22, an external water inlet pipe 3.23 and an external negative electrode plate 3.24;
temperature control system 4: thermocouple 4.1, thermocouple extension 4.2, high-speed sliding ring 4.3, data acquisition module 4.4, control software 4.5, data conversion transmission module 4.6, high-frequency alternating current power cabinet 4.7.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 9, an in-situ heating temperature control device is designed in the implementation, and the device comprises a sample chuck 1, an induction heating system 2, a circulating water cooling system 3 and a temperature control system 4; the sample chuck 1 is coaxially arranged on the main shaft of the centrifugal machine and synchronously rotates along with the main shaft of the centrifugal machine, the sample chuck 1 is provided with the test sample 1.1, the induction heating system 2 is coaxially arranged on the centrifugal machine and is not fixedly maintained along with the rotation of the main shaft of the centrifugal machine, the induction heating system 2 is connected with the circulating water cooling system 3, and the temperature control system 4 is respectively connected with the circulating water cooling system 3 and the test sample 1.1.
The centrifugal machine is a hypergravity centrifugal machine.
As shown in fig. 1, the sample chuck 1 is used for installing a test sample and is connected with a centrifuge through a main shaft, and comprises a disc body, clamping grooves 1.2 and flanges 1.3, wherein the flanges 1.3 are coaxially and fixedly arranged at two ends of the center of the disc body, the disc body is coaxially and fixedly connected with the main shaft of the centrifuge through the flanges 1.3, a plurality of clamping grooves 1.2 are formed in the periphery of the disc body along the circumferential direction, the clamping grooves 1.2 are arranged at intervals along the circumferential direction, and each clamping groove 1.2 is used for installing one test sample 1.1.
The flange 1.3 is used for connecting the sample chuck 1 with a centrifuge spindle, and the sample chuck 1 is driven to rotate by the high-speed rotation of the centrifuge spindle during experiments, so that centrifugal load is applied to the test sample 1.1.
The clamping groove 1.2 is mainly used for fixing the test sample 1.1 rotating at a high speed, and the assembling tenon 1.1.4 of the test sample 1.1 is arranged in the clamping groove 1.2, so that the sample chuck 1 drives the test sample 1.1 to rotate together when rotating.
As shown in fig. 2, the test sample 1.1 is formed by processing a metal material with test performance, is in a strip shape, and comprises a mass block 1.1.1, a standard moment section 1.1.2, a bearing section 1.1.3 and an assembling tenon 1.1.4 which are sequentially connected, wherein the mass block 1.1.1, the standard moment section 1.1.2, the bearing section 1.1.3 and the assembling tenon 1.1.4 are sequentially arranged along the strip shape of the test sample 1.1, and the specific mass block 1.1.1, the standard moment section 1.1.2, the bearing section 1.1.3 and the assembling tenon 1.1.4 are sequentially arranged radially outwards from a clamping groove 1.2 of the sample chuck 1, and the assembling tenon 1.1.4 is embedded in the clamping groove 1.2 of the sample chuck 1.
The width of the tenon 1.1.4 and the groove width of the clamping groove 1.2 of the sample chuck 1 are larger than the widths of the mass block 1.1.1, the standard moment section 1.1.2 and the bearing section 1.1.3 in specific implementation, so that the test sample 1.1 can be stably embedded and positioned when driven to rotate at a high speed by the sample chuck 1.
The mass 1.1.1 is used to apply a centrifugal stress to the target segment 1.1.3 at high rotational speeds by the centrifugal force generated by its own weight. When the mass of the mass block 1.1.1 is m, the effective radius is r, the rotating speed is omega, and the centrifugal force F=mromega generated by the mass block 1.1.1 is fast 2 . The weight m of the mass 1.1.1 depends on the breaking strength of the material under the experimental conditions.
The gauge length section 1.1.2 is connected with the mass 1.1.1 and is used for bearing centrifugal stress and thermal stress load applied by the mass 1.1.1 under high-speed rotation and high temperature. The shape of the gauge length sections 1.1.2 may be varied according to actual needs.
The load-bearing section 1.1.3 is used to connect the gauge length section 1.1.2 and the mounting tongue 1.1.4.
The test specimen 1.1 can be designed according to the experimental requirements, and the structure is shown in fig. 2, 6-8.
One or both of a thermocouple and a strain gauge are arranged in the center of the gauge length 1.1.2 of the test specimen 1.1.
As shown in fig. 3, the induction heating system 2 is operative to heat a high-speed rotating sample in situ, applying a temperature load to a designated area of the test sample 1.1. Comprises an upper induction coil 2.1, an upper fixing plate 2.3, a lower induction coil 2.5 and a lower fixing plate 2.7; the upper and lower fixing plates 2.3, 2.7 are fixedly arranged in parallel at a vertical interval, respectively, and in a specific implementation, the spindle of the centrifuge is rotatably arranged through the upper fixing plate 2.3. A sample chuck 1 is arranged in the space between the upper fixing plate 2.3 and the lower fixing plate 2.7; the upper fixing plate 2.3 and the lower fixing plate 2.7 are supported and fixed through a connecting rod 2.9, and a nut 2.10 is arranged at the outer end of the connecting rod 2.9 for installation. The annular upper induction coil 2.1 and the annular lower induction coil 2.5 are fixed on the bottom surface of the upper fixing plate 2.3, the lower fixing plate 2.7 and the top surface through the upper induction coil insulating layer 2.2 and the lower induction coil insulating layer 2.6 respectively.
The upper fixing plate 2.3 and the lower fixing plate 2.7 are annular plates, and the upper induction coil 2.1 and the lower induction coil 2.5 are integral annular coils.
Specifically, the upper induction coil 2.1 and the lower induction coil 2.5 are respectively wrapped in the inner cavities of the upper induction coil insulating layer 2.2 and the lower induction coil insulating layer 2.6, the inner cavities of the upper induction coil insulating layer 2.2 and the lower induction coil insulating layer 2.6 are communicated through pipelines, and the upper induction coil insulating layer 2.2 and the lower induction coil insulating layer 2.6 are respectively fixed on the bottom surface of the upper fixing plate 2.3 and the bottom surface and the top surface of the lower fixing plate 2.7 through the upper fixing screw 2.4 and the lower fixing screw 2.8.
Wherein, the upper induction coil 2.1 is wrapped in the upper induction coil insulating layer 2.2 to prevent conduction and is used for insulation; then an upper induction coil 2.1 with an insulating layer is fixed on an upper fixing plate 2.3 through an upper fixing screw rod 2.4 to form an upper induction coil; the lower induction coil 2.5 is wrapped in the insulating layer 2.6 of the lower induction coil, and the lower induction coil 2.5 with the insulating layer is fixed on the lower fixing plate 2.7 through the lower fixing screw rod 2.8 to form the lower induction coil; subsequently, the upper fixing plate 2.3 and the lower fixing plate 2.7 are assembled together by the connecting rod 2.9 and the nut 2.10.
Under the condition of alternating current, the metal material placed between the upper induction coil 2.1 and the lower induction coil 2.5 generates induction current I or eddy current under the action of alternating magnetic field, the eddy current generates heat through a conductor with resistance, and the metal material is heated in a heat conduction mode, wherein the joule heat Q=I generated by the induction current I 2 RtR is the resistance of the metal material, t is the time, and in the induction heating process, the heating temperature is controlled by adjusting the alternating current frequency f, the distance between the upper induction coil 2.1 and the lower induction coil 2.5 of the sample distance and the heating power.
As shown in fig. 4, the circulating water cooling system 3 serves to cool copper tubes in the upper induction coil 2.1 and the lower induction coil 2.5 of the induction heating system 2. The induction heating system comprises a pipeline component, a circulating water inlet pipe 3.1, a circulating water outlet pipe 3.3, a positive electrode 3.5, an inner insulating sleeve 3.6, a metal sleeve 3.7, a negative electrode 3.8, a copper pipe 3.9, an insulating pressing sleeve 3.10, a fixing flange 3.11, an insulating pressing sleeve 3.14, a compression round nut 3.15, a sealing piece 3.18, an electrode insulating pressing sleeve 3.19, an external water outlet pipe 3.21, an external positive electrode plate 3.22, an external water inlet pipe 3.23 and an external negative electrode plate 3.24 which are arranged in the induction heating system 2;
an insulation pressing sleeve 3.10 and a metal sleeve 3.7 are sequentially and coaxially sleeved outside the outer diameter of the copper pipe 3.9, an insulation pressing sleeve 3.10 used for being insulated with the metal sleeve 3.7 is fixedly and coaxially sleeved outside the copper pipe 3.9, and the metal sleeve 3.7 is coaxially sleeved outside the insulation pressing sleeve 3.10, so that insulation is kept between the copper pipe 3.9 and the metal sleeve 3.7; the middle part of the metal sleeve 3.7 is sealed and sleeved in a central hole of the fixed flange 3.11 through an insulation pressing sleeve 3.14 and a sealing ring 3.13 for a shaft, the fixed flange 3.11 is fixed on an experimental cavity cover of the centrifugal machine through a fixed screw 3.12, and two ends of the copper pipe 3.9, the insulation pressing sleeve 3.10 and the metal sleeve 3.7 are respectively fixed and sealed and installed through an inner insulation sleeve 3.6 and a sealing piece 3.18, and are insulated and water leakage is prevented through the inner insulation sleeve 3.6 and the sealing piece 3.18;
one end of the copper pipe 3.9 passes through the inner insulating sleeve 3.6 and then is coaxially butted with the circulating water outlet pipe 3.3, and a positive electrode 3.5 is arranged at the end part of the copper pipe 3.9 after passing through the inner insulating sleeve 3.6; the external positive electrode plate 3.22 is electrically connected with the copper pipe 3.9 through a plurality of electrode insulation press sleeves 3.19, specifically, at least two electrode insulation press sleeves 3.19 are sleeved on the external thread of the copper pipe 3.9 through threads, wherein the external positive electrode plate 3.22 is installed between two adjacent electrode insulation press sleeves 3.19 in a pressed mode, and the external positive electrode plate 3.22 passes through a gap between two adjacent electrode insulation press sleeves 3.19 and is electrically connected with the external positive electrode plate 3.22. So that the positive electrode 3.5 is directly connected with the external positive electrode plate 3.22 through the copper pipe 3.9;
the other end of the copper pipe 3.9 is in butt joint with the external water outlet pipe 3.21 through the sealing nut 3.20, so that the circulating water outlet pipe 3.3 directly circulates through the copper pipe 3.9 and the external water outlet pipe 3.21;
an annular pipeline gap is formed between the insulating pressure sleeve 3.10 and the metal sleeve 3.7 and is used as a water inlet channel, one end of the water inlet channel close to the inner insulating sleeve 3.6 is communicated and connected with the circulating water inlet pipe 3.1 through a metal pipeline, and the circulating water inlet pipe 3.1 is provided with a negative electrode 3.8 near the end part; the external negative electrode plate 3.24 is electrically connected with the metal sleeve 3.7 through a plurality of compression round nuts 3.15, specifically, at least two compression round nuts 3.15 are sleeved on the external thread of the metal sleeve 3.7 through threads, wherein the external negative electrode plate 3.24 is installed between two adjacent compression round nuts 3.15 in a compressed mode, and the external negative electrode plate 3.24 passes through a gap between two adjacent compression round nuts 3.15 and is electrically connected with the external negative electrode plate 3.24. So that the negative electrode 3.8 is electrically connected with the external negative electrode plate 3.24 after passing through the metal pipeline and the metal sleeve 3.7 in sequence;
the metal sleeve 3.7 is provided with a through groove on the pipe wall of one end, which is connected with the sealing element 3.18 and is provided with an external positive electrode plate 3.22 and an external negative electrode plate 3.24, the through groove is in flow connection with an external water inlet pipe 3.23, specifically, the insulating element 3.17 is sleeved on the metal sleeve 3.7 around the through groove through a jacking nut 3.16, and the external water inlet pipe 3.23 passes through a through hole on the insulating element 3.17 and is communicated with the through groove; so that the circulating water inlet pipe 3.1 circulates with the external water inlet pipe 3.23 after passing through the metal pipeline, the water inlet channel and the through groove in sequence;
wherein more specifically, copper pipe 3.9 is a hollow long copper pipe, and the periphery is installed insulating pressure cover 3.10 and is used for insulating, installs the sealing washer and can be used for preventing experimental cavity gas leakage.
The circulating water inlet pipe 3.1 is connected with the heating water inlet pipe 2.11 of the induction heating system 2 through a connecting nut 3.2; the circulating water outlet pipe 3.3 is connected with the heating water outlet pipe 2.13 of the induction heating system 2 through a connecting nut 3.4; the positive electrode 3.5 is arranged on the periphery of the circulating water outlet pipe 3.3, so that cooling water can be ensured to be cooled to the positive electrode 3.5; the negative electrode 3.8 is mounted on the periphery of the flow-through inlet pipe 3.1, ensuring that cooling water can be cooled to the negative electrode 3.8.
The metal sleeve 3.7 is externally arranged on a cavity cover of the experimental cavity through a flange 3.11 and is provided with 6 fixing screws 3.12, then the shaft is provided with a sealing ring 3.13 to prevent air leakage, and an insulating pressing sleeve 3.14 is used for insulating to prevent electric leakage; an external negative electrode plate 3.24 is fixedly arranged on the insulating pressing sleeve 3.14 through three pressing round nuts 3.15; the external water inlet pipe 3.23 is communicated with the through groove of the copper pipe 3.9 through the jacking nut 3.16 and the insulating piece 3.17, and the external water inlet pipe 3.23 is convenient to replace or maintain through the jacking nut 3.16, so that the insulating piece 3.17 prevents electric leakage of the motor; an external positive electrode plate 3.22 is fixed on the sealing element 3.18 through an electrode insulation pressing sleeve 3.19; and the external water outlet pipe 3.21 is communicated with a copper pipe of the circulating water outlet pipe 3.3 through a sealing nut 3.20 on the electrode insulation pressing sleeve 3.19.
The pipeline component comprises a heating water inlet pipe 2.11, a water inlet pipe sealing sleeve 2.12, a heating water outlet pipe 2.13 and a water outlet pipe sealing sleeve 2.14; one end of the heating water inlet pipe 2.11 and one end of the heating water outlet pipe 2.13 are respectively connected with the circulating water inlet pipe 3.1 and the circulating water outlet pipe 3.3 through the water inlet pipe sealing sleeve 2.12 and the water outlet pipe sealing sleeve 2.14, and the other ends of the heating water inlet pipe 2.11 and the heating water outlet pipe 2.13 are respectively communicated with the inner cavity environments where the upper induction coil 2.1 and the lower induction coil 2.5 in the induction heating system 2 are located, and the inner cavity environments where the upper induction coil 2.1 and the lower induction coil 2.5 are located are mutually communicated.
Specifically, the other end of the heating water inlet pipe 2.11 is connected with the circulating water inlet pipe 3.1 through a water inlet pipe sealing sleeve 2.12 and a connecting nut 3.2 respectively, and the other end of the heating water outlet pipe 2.13 is connected with the circulating water outlet pipe 3.3 through a water outlet pipe sealing sleeve 2.14 and a connecting nut 3.4 respectively.
The external water outlet pipe 3.21 and the external water inlet pipe 3.23 are respectively connected to the water inlet and the water outlet of the circulating water machine. In the concrete implementation, the external water outlet pipe 3.21 is connected with the water inlet pipe of the circulating water machine, and the external water inlet pipe 3.23 is connected with the water outlet pipe of the circulating water machine to form a closed circulating water cooling system for cooling the induction heating system 2.
The positive electrode 3.5 and the negative electrode 3.8 are electrically connected to the upper induction coil 2.1 and the lower induction coil 2.5, respectively, and the external positive electrode plate 3.22 and the external negative electrode plate 3.24 are connected to the positive and negative poles of an external power source, respectively. In specific implementation, the external positive electrode plate 3.22 is connected with the positive electrode of the high-frequency alternating-current power supply cabinet 4.7 serving as an alternating-current power supply, and the external negative electrode plate 3.24 is connected with the negative electrode of the high-frequency alternating-current power supply cabinet 4.7 serving as the alternating-current power supply to form a closed-loop circuit for supplying power to the induction heating system 2.
The inner cavity where the upper induction coil 2.1 is positioned is connected with a heating water inlet pipe 2.11, and the heating water inlet pipe 2.11 is connected with a circulating water inlet pipe 3.1 of the circulating water cooling system 3 through a water inlet pipe sealing sleeve 2.12; the inner cavity where the lower induction coil 2.5 is positioned is connected with a heating water outlet pipe 2.13, the heating water outlet pipe 2.13 is connected with a circulating water outlet pipe 3.3 of the circulating water cooling system 3 through a water outlet pipe sealing sleeve 2.14, and cooling water provided by the cooling system 3 cools down a copper pipe.
As shown in fig. 5, the temperature control system 4 is used to ensure that the test specimen 1.1 is heated to a predetermined temperature and maintained at that temperature until the end of the experiment by controlling the inductive power supply heating power. The high-speed electric power device comprises a thermocouple 4.1, a thermocouple extension line 4.2, a high-speed slip ring 4.3, a data acquisition module 4.4, a data conversion transmission module 4.6 and a high-frequency alternating current power cabinet 4.7; thermocouple 4.1 is fixedly arranged on the surface of test sample 1.1 corresponding to upper induction coil 2.1 and lower induction coil 2.5 of induction heating system 2, thermocouple 4.1 is connected with data acquisition module 4.4 through thermocouple extension line 4.2, high-speed slide ring 4.3, thermocouple extension line 4.2 is electrically connected with high-speed slide ring 4.3 after penetrating through the disk body of sample chuck 1 and the main shaft of the centrifuge, high-speed slide ring 4.3 is arranged on the main shaft of the centrifuge, data acquisition module 4.4 is in communication connection with high-frequency AC power supply cabinet 4.7 through data conversion transmission module 4.6, high-frequency AC power supply cabinet 4.7 is electrically connected with circulating water machine, external positive electrode plate 3.22 and external negative electrode plate 3.24 of circulating water cooling system 3.
In the concrete implementation, control software 4.5 is also arranged, and the control software 4.5 is respectively connected with the data acquisition module 4.4 and the data conversion transmission module 4.6.
During experiments, the thermocouple 4.1 is welded at the central part of the upper induction coil 2.1 and the lower induction coil 2.5 corresponding to the test sample 1.1, then the thermocouple 4.1 is connected with the high-speed slide ring 4.3 through the thermocouple extension line 4.2 and the hollow main shaft of the centrifugal machine, then is connected with the data acquisition module 4.4, the control software 4.5 and the data conversion transmission module 4.6 through wires, and finally, the control signal wire is connected with the high-frequency alternating current power supply cabinet 4.7 to form a temperature regulation and control system.
The invention also designs different samples to better test the mechanical properties of the test piece metal material.
The structure of the first test specimen 1.1, see fig. 2, is a fluted specimen and its related similar structure;
the structure of the second test specimen 1.1, see fig. 6, is a flat panel specimen and its related similar structure;
the third test specimen 1.1, see FIG. 7, is a round bar specimen and related similar structures;
the fourth test specimen 1.1 is shown in FIG. 8 for structure, structural gradient specimen and related similar structures.
The in-situ heating temperature control method comprises the following steps:
during the rotation of the spindle of the centrifuge, a temperature load is applied to the test specimen 1.1 by means of the induction heating system 2 while the spindle of the centrifuge is rotating, the application of the temperature load comprising the application of a constant and uniform temperature field in a uniform temperature heating mode, the application of a periodically varying alternating temperature field in a periodically varying alternating temperature heating mode, and the application of a temperature field of a constant range and with a gradient gradually varying in a heating mode of a temperature gradient.
The invention provides a plurality of in-situ heating modes for high-rotation-speed environments, and provides new experimental conditions for developing material performance tests under different temperatures and different rotation speeds. Among them, the heating mode of the present invention includes, but is not limited to, the following cases:
heating mode one: the standard moment section 1.1.2 of the test specimen 1.1 is subjected to a uniform temperature heating mode at a high rotation speed, as shown in FIG. 10.
The experimental materials are the same in type, the distance h between the standard moment section 1.1.2 and the upper induction coil 2.1 and the lower induction coil 2.5 in the experimental process is kept the same, the heating power and the heating frequency are kept unchanged in the time t, and a constant and uniform temperature field is applied to the standard moment section 1.1.2.
Heating mode two: the periodically varying alternating temperature heating pattern is performed at high rotational speeds for the standard moment section 1.1.2 of the test specimen 1.1, fig. 11.
The experimental materials are the same in type, the distance h between the standard moment section 1.1.2 and the upper induction coil 2.1 and the lower induction coil 2.5 in the experimental process is kept the same, the heating frequency is unchanged, but the heating power is periodically changed in the time T, T1 is applied to the standard moment section 1.1.2 in the time T1, and an alternating temperature field of T2 is applied in the time T2.
Heating mode three: fig. 12 shows a constant temperature gradient heating pattern of the standard moment section 1.1.2 of the test specimen 1.1 at a high rotational speed.
The experimental materials are the same in type, the standard moment section 1.1.2 of the test sample 1.1 is processed into an arc with the radius R, the distance h between the lowest end of the arc of the standard moment section 1.1.2 and the upper induction coil 2.1 and the lower induction coil 2.5 in the experimental process is kept the same, and the heating power and the heating frequency are kept unchanged in the time t. Because the distances from the arc-shaped moment section 1.1.2 to the induction coil 2.1 and the lower induction coil 2.5 are continuously changed, the sample heating temperature is inversely proportional to the distance from the sample heating temperature to the induction coil under the same power and frequency conditions according to the induction heating principle, and therefore a constant temperature gradient is implemented for the moment section 1.1.2 of the test sample 1.1.
The material performance test process under the high-rotation-high-temperature coupling effect by the method comprises the following steps:
the first step: determining the rotating speed of the centrifugal machine and the radius of the wheel disc according to experimental conditions;
and a second step of: determining the size and weight of the mass 1.1.1;
and a third step of: determining the size and geometric center of the gauge length section 1.1.2;
fourth step: determining experimental temperature and centrifugal stress applied by the geometric center of the gauge length section 1.1.2;
fifth step: mounting the test specimen 1.1 on the specimen chuck 1 by assembling the tenon 1.1.4, and determining the distance from the geometric center of the gauge length section 1.1.2 to the center of the rotating shaft;
sixth step: determining the rotating speed corresponding to the geometric center centrifugal stress value of the gauge length section 1.1.2 through finite element calculation;
seventh step: welding a temperature control thermocouple 4.1 at the geometric center position of the sample gauge length section 1.1.2, and connecting a temperature extension lead 4.2 of the temperature control thermocouple with a temperature control system 4 through a main shaft of a centrifugal machine;
welding a strain gauge at the geometric center position of the 1.1.2 sample gauge length section if the strain is tested, connecting a strain gauge extension wire into the data acquisition module 4.4 through a spindle of the centrifugal machine, and carrying out real-time acquisition of strain signals;
ninth step: the heating system 2 is activated to apply a temperature load to the sample. When the temperature reaches a preset temperature, preserving the heat for 30min;
during the temperature control, the power and frequency of the induced current are adjusted by the temperature control system 4 according to the temperature set by the experiment 1.1, which applies different temperatures.
Tenth step: starting the centrifugal machine to enable the rotating speed to reach the rotating speed corresponding to the centrifugal stress value;
eleventh step: keeping the temperature and the rotating speed unchanged until the sample breaks;
twelfth step: after the sample breaks, the heating and temperature control system is powered off, the centrifuge is powered off, and the sample is air-cooled to room temperature.
Claims (10)
1. An in-situ heating temperature control method under the action of high rotating speed and high temperature is characterized in that:
when the spindle of the centrifuge rotates, a temperature load is applied to the test specimen (1.1) by the induction heating system (2) while the spindle of the centrifuge rotates, wherein the application of the temperature load comprises the application of a constant and uniform temperature field according to a uniform temperature heating mode, the application of a periodically changing alternating temperature field according to a periodically changing alternating temperature heating mode, and the application of a temperature field with a fixed range and gradient change according to a heating mode of a temperature gradient.
2. The method for in-situ heating and temperature control under the action of high rotating speed and high temperature according to claim 1, wherein the method comprises the following steps: the uniform temperature heating mode specifically comprises the following steps: the distance h between the standard moment section (1.1.2) of the test sample (1.1) and the upper induction coil (2.1) and the lower induction coil (2.5) respectively is kept the same, and the current power and the current alternating frequency of the upper induction coil (2.1) and the lower induction coil (2.5) are kept unchanged in the t time, so that a constant and uniform temperature field is applied to the standard moment section (1.1.2).
3. The method for in-situ heating and temperature control under the action of high rotating speed and high temperature according to claim 1, wherein the method comprises the following steps: the periodically-changing alternating-temperature heating mode specifically comprises the following steps: the distance h between the standard moment section (1.1.2) of the test sample (1.1) and the upper induction coil (2.1) and the lower induction coil (2.5) is kept the same, the current alternating frequency of the upper induction coil (2.1) and the lower induction coil (2.5) is unchanged, but the current power of the upper induction coil (2.1) and the lower induction coil (2.5) is periodically changed in the T time, so that the standard moment section (1.1.2) is subjected to an alternating temperature field which is formed by applying the temperature T1 in the T1 time and applying the temperature T2 in the T2 time and is continuously and periodically repeatedly and alternately changed.
4. The method for in-situ heating and temperature control under the action of high rotating speed and high temperature according to claim 1, wherein the method comprises the following steps: the heating mode of the temperature gradient is specifically as follows: processing a standard moment section (1.1.2) of a test sample (1.1) into an arc with a radius of R, wherein the lowest end of the arc of the standard moment section (1.1.2) is respectively the same as the distance h between an upper induction coil (2.1) and a lower induction coil (2.5), and the current power and the current alternating frequency of the upper induction coil (2.1) and the lower induction coil (2.5) are kept unchanged in a time t; a temperature gradient temperature field is thus applied to the target section (1.1.2) of the test specimen (1.1).
5. The method for in-situ heating and temperature control under the action of high rotating speed and high temperature according to claim 1, wherein the method comprises the following steps: the method adopts an in-situ heating temperature control device, and the device comprises a sample chuck (1), an induction heating system (2), a circulating water cooling system (3) and a temperature control system (4); the sample chuck (1) is coaxially arranged on a main shaft of the centrifugal machine and synchronously rotates along with the main shaft of the centrifugal machine, the sample chuck (1) is provided with a test sample (1.1), the induction heating system (2) is coaxially arranged on the centrifugal machine and does not rotate along with the main shaft of the centrifugal machine, the induction heating system (2) is connected with the circulating water cooling system (3), and the temperature control system (4) is respectively connected with the circulating water cooling system (3) and the test sample (1.1).
6. The method for in-situ heating and temperature control under high rotation speed and high temperature according to claim 5, wherein the method comprises the following steps: the sample chuck (1) comprises a disc body, clamping grooves (1.2) and flanges (1.3), the flanges (1.3) are coaxially arranged at two ends of the center of the disc body, the disc body is fixedly connected with a main shaft of a centrifugal machine through the flanges (1.3), a plurality of clamping grooves (1.2) are formed in the periphery of the disc body along the circumferential direction, the clamping grooves (1.2) are arranged at intervals along the circumferential direction, and each clamping groove (1.2) is used for installing one test sample (1.1).
7. The method for in-situ heating and temperature control under high rotation speed and high temperature according to claim 5, wherein the method comprises the following steps: the test sample (1.1) is in a strip shape, and comprises a mass block (1.1.1), a standard moment section (1.1.2), a bearing section (1.1.3) and an assembling tenon (1.1.4) which are sequentially connected, wherein the mass block (1.1.1), the standard moment section (1.1.2), the bearing section (1.1.3) and the assembling tenon (1.1.4) are sequentially arranged along the strip shape of the test sample (1.1), and the assembling tenon (1.1.4) is embedded in a clamping groove (1.2) of the sample chuck (1).
8. The method for in-situ heating and temperature control under high rotation speed and high temperature according to claim 5, wherein the method comprises the following steps: the induction heating system (2) comprises an upper induction coil (2.1), an upper fixing plate (2.3), a lower induction coil (2.5) and a lower fixing plate (2.7); the upper fixing plate (2.3) and the lower fixing plate (2.7) are respectively and fixedly arranged in parallel at an upper-lower interval, and the sample chuck (1) is arranged in the interval between the upper fixing plate (2.3) and the lower fixing plate (2.7); the annular upper induction coil (2.1) and the annular lower induction coil (2.5) are respectively fixed on the bottom surface of the upper fixing plate (2.3) and the bottom surface of the lower fixing plate (2.7) and the top surface through the upper induction coil insulating layer (2.2) and the lower induction coil insulating layer (2.6).
9. The method for in-situ heating and temperature control under high rotation speed and high temperature according to claim 5, wherein the method comprises the following steps: the circulating water cooling system (3) comprises a pipeline assembly arranged in the induction heating system (2), a circulating water inlet pipe (3.1), a circulating water outlet pipe (3.3), a positive electrode (3.5), an inner insulating sleeve (3.6), a metal sleeve (3.7), a negative electrode (3.8), a copper pipe (3.9), an insulating pressing sleeve (3.10), a fixing flange (3.11), an insulating pressing sleeve (3.14), a pressing round nut (3.15), a sealing element (3.18), an electrode insulating pressing sleeve (3.19), an external water outlet pipe (3.21), an external positive electrode plate (3.22), an external water inlet pipe (3.23) and an external negative electrode plate (3.24); an insulating pressing sleeve (3.10) used for insulating the copper pipe (3.9) from the metal sleeve (3.7) is sleeved outside the copper pipe (3.9), and the metal sleeve (3.7) is sleeved outside the insulating pressing sleeve (3.10); the middle part of the metal sleeve (3.7) is sealed and sleeved in a central hole of the fixed flange (3.11) through the insulating pressing sleeve (3.14) and the sealing ring (3.13) for the shaft, the fixed flange (3.11) is fixed on an experimental cavity cover of the centrifugal machine, and two ends of the copper pipe (3.9), the insulating pressing sleeve (3.10) and the metal sleeve (3.7) are respectively fixed and sealed and installed through the inner insulating sleeve (3.6) and the sealing piece (3.18); one end of the copper pipe (3.9) passes through the inner insulating sleeve (3.6) and then is coaxially butted with the circulating water outlet pipe (3.3), and a positive electrode (3.5) is arranged at the end part of one end of the copper pipe (3.9) which passes through the inner insulating sleeve (3.6); the external positive electrode plate (3.22) is electrically connected with the copper pipe (3.9) through the electrode insulation pressing sleeve (3.19), so that the positive electrode (3.5) is electrically connected with the external positive electrode plate (3.22) after directly passing through the copper pipe (3.9); the other end of the copper pipe (3.9) is in butt joint with the external water outlet pipe (3.21), so that the circulating water outlet pipe (3.3) directly circulates through the copper pipe (3.9) and the external water outlet pipe (3.21); an annular pipeline gap is formed between the insulating pressure sleeve (3.10) and the metal sleeve (3.7) and is used as a water inlet channel, one end of the water inlet channel is communicated and connected with a circulating water inlet pipe (3.1) through a metal pipeline, and a negative electrode (3.8) is arranged near the end part of the circulating water inlet pipe (3.1); the external negative electrode plate (3.24) is electrically connected with the metal sleeve (3.7) through the compression round nut (3.15), so that the negative electrode (3.8) is electrically connected with the external negative electrode plate (3.24) after passing through the metal pipeline and the metal sleeve (3.7) in sequence; the metal sleeve (3.7) is provided with a through groove on the pipe wall at one end of the connecting sealing piece (3.18), and the through groove is in flow connection with the external water inlet pipe (3.23), so that the flow water inlet pipe (3.1) sequentially passes through the metal pipeline, the water inlet channel and the through groove and then flows with the external water inlet pipe (3.23);
the pipeline assembly comprises a heating water inlet pipe (2.11), a water inlet pipe sealing sleeve (2.12), a heating water outlet pipe (2.13) and a water outlet pipe sealing sleeve (2.14); one end of a heating water inlet pipe (2.11) and one end of a heating water outlet pipe (2.13) are respectively connected with a circulating water inlet pipe (3.1) and a circulating water outlet pipe (3.3) through a water inlet pipe sealing sleeve (2.12), a water outlet pipe sealing sleeve (2.14), and the other ends of the heating water inlet pipe (2.11) and the heating water outlet pipe (2.13) are respectively communicated with an inner cavity environment where an upper induction coil (2.1) and a lower induction coil (2.5) in an induction heating system (2) are located, and the inner cavity environments where the upper induction coil (2.1) and the lower induction coil (2.5) are located are mutually communicated.
10. The method for in-situ heating and temperature control under high rotation speed and high temperature according to claim 5, wherein the method comprises the following steps: the temperature control system (4) comprises a thermocouple (4.1), a thermocouple extension line (4.2), a high-speed sliding ring (4.3), a data acquisition module (4.4), a data conversion transmission module (4.6) and a high-frequency alternating current power supply cabinet (4.7); the induction heating system is characterized in that thermocouples (4.1) are fixedly arranged on the surface of a test sample (1.1) positively corresponding to an upper induction coil (2.1) and a lower induction coil (2.5) of the induction heating system (2), the thermocouples (4.1) are connected with a data acquisition module (4.4) through thermocouple extension lines (4.2), high-speed sliding rings (4.3) and data acquisition modules (4.4), the data acquisition module (4.4) is in communication connection with a high-frequency alternating current power cabinet (4.7) through a data conversion transmission module (4.6), and the high-frequency alternating current power cabinet (4.7) is electrically connected with an external positive electrode plate (3.22) and an external negative electrode plate (3.24) of the circulating water cooling system (3).
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