An automatically coordinated multi-station high and low temperature creep endurance strength testing machine

Abstract

The present invention discloses an automatically coordinated multi-station high and low temperature creep endurance strength testing machine, which relates to the technical field of creep endurance strength testing. The machine comprises a shell, a lifting rod is installed on the shell, an isolation cylinder is installed above the lifting rod, a fixed rod is installed above the isolation cylinder, a heat transfer cylinder is installed outside the isolation cylinder, a plate A, a plate B and a heat transfer medium are installed inside the heat transfer cylinder, a coil is installed inside the isolation cylinder, a sliding ring A and a sliding ring B are installed outside the coil, the lifting rod is threadedly connected to the lower side of the tested object, the fixed rod is threadedly connected to the upper side of the tested object, the heat transfer medium adjusts the distance between the plate A and the plate B, the plate A and the plate B cooperate to realize the temperature detection of the tested object, the fixed rod cooperates with the lifting rod to detect the deformation, displacement and torque of the tested object, the coil heats the tested object, and the sliding ring A and the sliding ring B adjust the heating area of ​​the coil.

Description

Technical Field

[0001] The invention relates to the technical field of creep endurance strength testing, in particular to an automatically coordinated multi-station high and low temperature creep endurance strength testing machine. Background Art

[0002] The creep endurance test is a high-temperature tensile test that is carried out under constant temperature and constant load to determine the deformation, torque and displacement of the test piece. Therefore, the constant temperature of the test piece is crucial. Existing testing machines mainly use temperature sensors to detect the temperature of the test piece, and then heat the entire test piece through a heating wire. This processing method can be used in situations where the test accuracy requirements are not high. The main problem is that there is no temperature detection at different positions of the test piece to adjust the heating area, resulting in repeated heating of the test piece, resulting in inaccurate test data. Therefore, the main problems of existing creep endurance strength testing machines are: (1) no temperature detection, inaccurate heating, (2) single station, unable to conduct tests simultaneously, (3) no heat recovery, resulting in heat waste. Summary of the invention

[0003] The object of the present invention is to provide an automatically coordinated multi-station high and low temperature creep endurance strength testing machine to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising a shell, a lifting rod is installed on the shell, an isolation tube is installed above the lifting rod, a fixed rod is installed above the isolation tube, a heat transfer tube is installed on the outside of the isolation tube, a pole plate A, a pole plate B and a heat conductive medium are installed in the heat transfer tube, a coil is installed inside the isolation tube, a sliding ring A and a sliding ring B are installed on the outside of the coil, the lifting rod is threadedly connected to the lower side of the measured object, the fixed rod is threadedly connected to the upper side of the measured object, the heat conductive medium adjusts the distance between the pole plate A and the pole plate B, the pole plate A and the pole plate B cooperate to realize the temperature detection of the measured object, the fixed rod and the lifting rod cooperate to detect the deformation, displacement and torque of the measured object, a control panel is installed on the shell, the control panel is provided with a start button, a stop button and an emergency stop button, and a control system is provided in the control panel.

[0005] There are multiple groups of isolation cylinders, and the multiple groups of isolation cylinders are installed on the outer shell at equal intervals in sequence. Several guide shafts are vertically installed on the outside of the isolation cylinder, and the guide shafts are installed on the outer shell. Two groups of sliding plates A are slidably connected to each of the guide shafts. A return spring A is connected to the upper sliding plate A, and a return spring B is connected to the lower sliding plate A. One ends of the return spring A and the return spring B are both installed on the outer shell. The inner walls of the sliding ring A and the sliding ring B are in contact with the outside of the coil. Sliding plates B are installed on the outside of the sliding ring A and the sliding ring B. The sliding plate B is slidably connected to the isolation cylinder, and the sliding plate B passes through the isolation cylinder and is connected to the sliding plate A.

[0006] The sliding ring A and the sliding ring B are both electrically connected to the control system, and both ends of the reset spring A and the reset spring B are both electrically connected to the control system. The sliding plate B is made of insulating material. The heat transfer tube is provided with multiple groups, and the multiple groups of heat transfer tubes are installed on the isolation tube at equal intervals up and down. The pole plate A is sleeved in the heat transfer tube, and the pole plate A is a sleeve structure. The pole plate B is sleeved inside the pole plate A. The pole plate A and the pole plate B are both electrically connected to the control system, and both ends of the coil are electrically connected to the control system. The coil is installed on the isolation tube, and the isolation tube is made of insulating material.

[0007] The interior of the isolation cylinder is hollow, the fixing rod passes through the upper side of the isolation cylinder, and the lifting rod passes through the lower side of the isolation cylinder. The inner walls of the odd-numbered isolation cylinders are provided with Seebeck plates A, and the inner walls of the even-numbered isolation cylinders are provided with Seebeck plates B and a first heating wire. The Seebeck plate B is provided on one side of the first heating wire. One end of the Seebeck plate A is connected to the Seebeck plate B through a first wire and a metal sheet, and the other end of the Seebeck plate A is connected to the Seebeck plate B through another group of the first wire and the metal sheet. The first wire is electrically connected to a control system, and two adjacent groups of the first wire and the metal sheet are composed of different semiconductor materials. The first heating wire is electrically connected to a control system, and a first cooling wire is provided on one side of the Seebeck plate A and the first heating wire, and the first cooling wire is electrically connected to the control system.

[0008] Press the start button on the control panel to start the device. Through external processing equipment, threaded bosses are first processed on both ends of the test piece. Then, the lower boss of the test piece is connected to the threaded groove on the left lifting rod. Then, the stretching mechanism below the lifting rod drives the lifting rod to move upward, and the lifting rod drives the test piece to move upward to the middle position of the isolation tube. Then, the stretching mechanism above the fixed rod drives the fixed rod to move downward, so that the threaded groove on the lower side of the fixed rod contacts the upper side of the test piece. The stretching mechanism above the fixed rod drives the fixed rod to rotate and move downward, so that the lower side of the fixed rod is threadedly connected to the test piece. At this time, the test piece is connected to the middle position of the isolation tube by the fixed rod and the lifting rod, that is, the middle position of the coil. Similarly, another test piece is installed in the right isolation tube. The test piece on the left is made of metal material, and the test piece on the right is made of non-metallic material, and the test temperature of the test piece on the left is greater than the test temperature of the test piece on the right.

[0009] After the tested piece is installed, a tensile test is performed on the tested piece. The tensile mechanism pulls the fixed rod and the lifting rod to move to both sides respectively to stretch the tested piece. The sensor in the tensile mechanism detects the deformation, torque and displacement of the tested piece in real time and feeds the data back to the control system. The tested piece is heated at the same time. The sliding plate A and the sliding plate B are abutted against the middle position of the outer side of the isolation cylinder by the return spring A and the return spring B.

[0010] The control system passes alternating current into the coil in the left isolation cylinder, and the first heating wire in the right isolation cylinder is connected to the circuit by the control system. The coil generates an alternating magnetic field. Since the piece under test on the left is made of metal, the alternating magnetic field generates eddy currents in the piece under test on the left, thereby increasing the temperature of the piece under test and heating it to the set temperature. The set temperature is set in advance by the staff through the control panel. The first heating wire generates heat and transfers it to the piece under test on the right, heating the piece under test on the right to the set temperature. After that, the first heating wire and the coil are powered off.

[0011] When the temperature of the measured object rises, the heat of the measured object is transferred to the heat-conducting medium in the heat transfer tube. The heat-conducting medium absorbs heat and expands. The pressure in the chamber where the heat-conducting medium is located increases, and the electrode plate A and the electrode plate B form a capacitor. The heat-conducting medium pushes the electrode plate B to move upward, so that the facing area between the electrode plate A and the electrode plate B becomes smaller. The facing area refers to the overlapping area between the electrode plate A and the electrode plate B. Therefore, the capacity of the capacitor decreases, while the voltage and angular frequency at both ends of the electrode plate A and the electrode plate B remain unchanged, so the loop current formed by the electrode plate A and the electrode plate B will decrease;

[0012] When the temperature of the measured object decreases, the heat of the thermal conductive medium decreases, the pressure in the chamber where the thermal conductive medium is located decreases, and the thermal conductive medium will shrink. At this time, the pressure on the lower side of plate B is less than the pressure on the upper side. The external atmospheric pressure pushes plate B to move downward, and the facing area between plate A and plate B becomes larger, and the capacity of the capacitor increases. Similar to the upward movement of plate B mentioned above, the loop current connecting plate A and plate B will increase.

[0013] The control system determines the temperature of the test piece on the side close to the heat-conducting medium according to the magnitude of the current. Since multiple sets of heat-conducting media, heat transfer tubes, plates A and B are provided, and the heat transfer tubes are installed on the isolation tube at equal intervals upward, the temperature of the test piece can be detected all around. In this way, the system controls the magnitude of the current, and then determines the temperature of the test piece at different heights to adjust the coordination of the coil, sliding ring A and sliding ring B.

[0014] Afterwards, the control system determines which height range of the measured object needs to be heated based on multiple sets of temperature data. The following takes a range on the upper layer of the measured object as an example. The control system passes current into reset spring A, reset spring A will shrink, reset spring A pulls sliding plate A to move upward, sliding plate A drives sliding plate B to move upward, sliding plate B drives sliding ring A to move upward, at this time reset spring B is released, reset spring B pushes sliding ring B to move upward through sliding plate B, after which the control system passes current into reset spring B, reset spring B will shorten, reset spring B pulls sliding ring B to move downward through sliding plate B, and the adjustment distance of sliding ring A and sliding ring B is determined by the magnitude of the current passed into reset spring A and reset spring B respectively. The control system adjusts the magnitude of the current in reset spring A and reset spring B, and then adjusts the movement distance of sliding ring A and sliding ring B. Afterwards, under the adjustment of the control system, sliding ring A moves to the upper end of the measured object that needs to be heated, and sliding ring B moves to the lower end of the measured object that needs to be heated;

[0015] The heat-conducting medium is made of a thermal expansion material, the volume of the heat-conducting medium when it does not absorb heat is V0, the height of the heat-conducting medium when it does not absorb heat is h, the heating expansion coefficient of the heat-conducting medium is α, the temperature of the heat-conducting medium when it does not absorb heat is T0, and the temperature of the heat-conducting medium after absorbing heat is T1;

[0016] A capacitor C is formed between the plates A and B. The area of ​​the plates A and B facing each other is S0. The vacuum dielectric constant between the plates A and B is ε0, and the relative dielectric constant is ε r , the outer diameter of plate B is d, the inner diameter of plate A is D, and the length of plate A is L.

[0017] When the heat transfer medium does not absorb heat, that is, T0 = T1, the control system is based on C0 = ε0ε rS0 / d, calculate the initial value C0 of the capacitor C, and the control system is based on V0=πD 2 h, calculate the volume V0 of the heat-conducting medium when it does not absorb heat;

[0018] When the heat-conducting medium absorbs heat, that is, T1>T0, the heat-conducting medium pushes the plate B to move x, and the expansion of the heat-conducting medium is ΔV. The control system substitutes V0=πD2h according to ΔV=V0α(T1-T0) to obtain ΔV=πD 2 hα(T1-T0), since the expansion of the heat-conducting medium ΔV is equal to the volume change of the plate B displacement x, ΔV=πD 2 x,πD 2 hα(T1-T0)=πD 2 x, and we get x=αh(T1-T0).

[0019] Control system based on Calculate the capacitance

[0020] The voltage across the pole plate A and the pole plate B is U, and the angular frequency is ω. The control system is based on I0=UωC0, and then Substitute and calculate the current I0 when the heat conducting medium does not absorb heat,

[0021] The control system calculates the current I1 after the heat transfer medium absorbs heat according to I1=UωC1, and then and Substituting in, we get

[0022] After the control system calculates I1 and I0, it reversely derives T1. The control system can then know the temperature of each area of ​​the measured object.

[0023] It includes a stretching mechanism, the upper side of the fixed rod is connected to the stretching mechanism, the lower side of the lifting rod is connected to another group of the stretching mechanisms, the stretching mechanism is installed on the shell, and multiple groups of sensors are installed in the stretching mechanism, and the multiple groups of sensors are used to detect the deformation, displacement and torque of the measured object.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0025] 1. Multi-station design, multiple tests can be carried out simultaneously. Multiple sets of isolation cylinders, lifting rods, fixed rods and stretching mechanisms are used to carry out multiple tests simultaneously, greatly improving the test efficiency. Each set of isolation cylinders, lifting rods, fixed rods and stretching mechanisms are independently set, and the test data of each set of tested parts can be independently measured at the same time.

[0026] 2. The temperature of the tested object is detected at multiple positions, making the temperature more accurate and the test precision higher. The heat of the tested object is transferred to the heat-conducting medium in the heat transfer tube. The heat-conducting medium absorbs heat and expands. The pressure in the chamber where the heat-conducting medium is located increases, and the plates A and B form a capacitor. The heat-conducting medium pushes the plate B upward, making the facing area between the plates A and B smaller. The facing area refers to the overlapping area between the plates A and B, so the capacity of the capacitor decreases, while the voltage and angular frequency at both ends of the plates A and B remain unchanged, so the loop current formed by the plates A and B will decrease. The control system determines the temperature of the tested object based on the current.

[0027] 3. Heat recovery is achieved through the cooperation of Seebeck plate A and Seebeck plate B, and used for heating treatment. The set temperature of the left test piece is greater than the set temperature of the right test piece. Due to the Seebeck effect, current will be generated in the Seebeck plate A in the left isolation cylinder and the Seebeck plate B on the right. The current flows through the Seebeck plate A, the first wire and the metal sheet, another set of the first wire, the metal sheet and the Seebeck plate B, and then flows into the control system through the first wire. After being processed by the control system, it is used for heating treatment of the first heating wire.

[0028] 4. The coil is locally heated, and the overall temperature of the tested piece is kept in a constant temperature state, which improves the test accuracy. The current will flow in from the slip ring A, then pass through the coil between the slip ring A and the slip ring B, and flow out from the slip ring B. The effective number of turns of the coil is the number of turns between the slip ring A and the slip ring B. When the current flows through the number of turns of the coil between the slip ring A and the slip ring B, the tested piece within the range between the slip ring A and the slip ring B will be heated. Through the above design, the temperature around the tested piece can be detected, and then the technical solution of heating the tested piece locally is more efficient and energy-saving, the heating is more precise, and the test accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 yes Figure 1 The main view of

[0032] Figure 3 It is a schematic diagram of the structure of the heat insulation cylinder, the guide shaft, the return spring A and the return spring B and their components;

[0033] Figure 4 yes Figure 3 A longitudinal cross-sectional view of

[0034] Figure 5 yes Figure 1 A partial enlarged view of the middle A area;

[0035] Figure 6 yes Figure 3 The schematic diagram of the structure without the guide shaft, return spring A and return spring B;

[0036] Figure 7 yes Figure 6 Schematic diagram of the structure without the isolation tube and the heat transfer tube;

[0037] Figure 8 yes Figure 7 Schematic diagram of the structure without the coil and its components;

[0038] Fig. 9 yes Figure 8 Schematic diagram of the structure without the device under test.

[0039] In the figure: 1. control panel; 11. housing; 12. test piece; 13. lifting rod; 14. fixing rod; 2. isolation tube; 21. heat transfer tube; 211. heat conducting medium; 22. electrode plate A; 23. electrode plate B; 24. guide shaft; 25. reset spring A; 251. reset spring B; 3. coil; 31. sliding ring A; 32. sliding ring B; 33. Seebeck plate A; 34. Seebeck plate B. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 9The present invention provides a technical solution: comprising a shell 11, a lifting rod 13 is installed on the shell 11, an isolation tube 2 is installed above the lifting rod 13, a fixing rod 14 is installed above the isolation tube 2, a heat transfer tube 21 is installed outside the isolation tube 2, a plate A22, a plate B23 and a heat transfer medium 211 are installed inside the heat transfer tube 2, a coil 3 is installed inside the isolation tube 2, a sliding ring A31 and a sliding ring B32 are installed outside the coil 3, the lifting rod 13 is threadedly connected to the lower side of the measured object 12, the fixing rod 14 is threadedly connected to the upper side of the measured object 12, and the heat transfer medium 211 adjusts the distance between the plate A22 and the plate B23, The pole plate A22 and the pole plate B23 cooperate to realize the temperature detection of the test piece 12, and the fixed rod 14 and the lifting rod 13 cooperate to detect the deformation, displacement and torque of the test piece 12. A control panel 1 is installed on the outer shell 11. The control panel 1 is provided with a start button, a stop button and an emergency stop button. A control system is arranged in the control panel 1, including a stretching mechanism. The upper side of the fixed rod 14 is connected to the stretching mechanism, and the lower side of the lifting rod 13 is connected to another group of stretching mechanisms. The stretching mechanism is installed on the outer shell 11, and multiple groups of sensors are installed in the stretching mechanism. The multiple groups of sensors are used to detect the deformation, displacement and torque of the test piece 12.

[0042] There are multiple groups of isolation cylinders 2, and the multiple groups of isolation cylinders 2 are installed on the shell 11 at equal intervals in sequence. Several guide shafts 24 are vertically installed on the outside of the isolation cylinder 2, and the guide shafts 24 are installed on the shell 11. Two groups of sliding plates A are slidably connected to each guide shaft 24. A return spring A25 is connected to the upper sliding plate A, and a return spring B251 is connected to the lower sliding plate A. One end of the return spring A25 and the return spring B251 are both installed on the shell 11. The inner walls of the sliding ring A31 and the sliding ring B32 are in contact with the outside of the coil 3. The sliding plates B are installed on the outside of the sliding ring A31 and the sliding ring B32. The sliding plate B is slidably connected to the isolation cylinder 2. Plate B passes through the isolation tube 2 and is connected to the sliding plate A. The sliding ring A31 and the sliding ring B32 are both electrically connected to the control system. Both ends of the return spring A25 and the return spring B251 are both electrically connected to the control system. The sliding plate B is made of insulating material. There are multiple groups of heat transfer tubes 21, and the multiple groups of heat transfer tubes 21 are installed on the isolation tube 2 at equal intervals up and down. The pole plate A22 is sleeved in the heat transfer tube 21. The pole plate A22 is a sleeve structure. The pole plate B23 is sleeved inside the pole plate A22. The pole plate A22 and the pole plate B23 are both electrically connected to the control system. Both ends of the coil 3 are electrically connected to the control system. The coil 3 is installed on the isolation tube 2, and the isolation tube 2 is made of insulating material.

[0043] The interior of the isolation cylinder 2 is hollow, the fixing rod 14 passes through the upper side of the isolation cylinder 2, the lifting rod 13 passes through the lower side of the isolation cylinder 2, the inner walls of the odd-numbered isolation cylinders 2 are provided with Seebeck plates A33, the inner walls of the even-numbered isolation cylinders 2 are provided with Seebeck plates B34 and a first heating wire, the Seebeck plate B34 is provided on one side of the first heating wire, one end of the Seebeck plate A33 is connected to the Seebeck plate B34 through a first wire and a metal sheet, the other end of the Seebeck plate A33 is connected to the Seebeck plate B34 through another group of first wires and a metal sheet, the first wire is electrically connected to the control system, the two groups of first wires and metal sheets are composed of different semiconductor materials, the first heating wire is electrically connected to the control system, the Seebeck plate A33 and one side of the first heating wire are provided with a first cooling wire, and the first cooling wire is electrically connected to the control system.

[0044] The heat-conducting medium 211 is made of a thermal expansion material. The volume of the heat-conducting medium 211 when it does not absorb heat is V0. The height of the heat-conducting medium 211 when it does not absorb heat is h. The heating expansion coefficient of the heat-conducting medium 211 is α. The temperature of the heat-conducting medium 211 when it does not absorb heat is T0. The temperature of the heat-conducting medium 211 after absorbing heat is T1.

[0045] A capacitor C is formed between the plate A22 and the plate B23. The area of ​​the plate A22 and the plate B23 facing each other is S0. The vacuum dielectric constant between the plate A22 and the plate B23 is ε0, and the relative dielectric constant is ε r , the outer diameter of the electrode plate B23 is d, the inner diameter of the electrode plate A22 is D, and the length of the electrode plate A22 is L.

[0046] When the heat conducting medium 211 does not absorb heat, that is, T0=T1, the control system is based on C0=ε0ε r S0 / d, calculate the initial value C0 of the capacitor C, and the control system is based on V0=πD 2 h, calculate the volume V0 of the heat-conducting medium 211 when it does not absorb heat;

[0047] When the heat conducting medium 211 absorbs heat, that is, T1>T0, the heat conducting medium 211 pushes the plate B23 to move x, and the expansion amount of the heat conducting medium 211 is ΔV. The control system calculates V0=πD according to ΔV=V0α(T1-T0). 2 Substituting h into the equation, we get ΔV = πD 2 hα(T1-T0), since the expansion ΔV of the heat-conducting medium 211 is equal to the volume change of the displacement x of the electrode plate B23, ΔV=πD 2 x,πD 2 hα(T1-T0)=πD 2 x, and we get x=αh(T1-T0).

[0048] Control system based on Calculate the capacitance

[0049] The voltage across the pole plate A22 and the pole plate B23 is U, and the angular frequency is ω. The control system is based on I0=UωC0, and then Substitute and calculate the current I0 when the heat conducting medium 211 does not absorb heat,

[0050] The control system calculates the current I1 after the heat conducting medium 211 absorbs heat according to I1=UωC1, and then and Substituting in, we get

[0051] The control system infers the size of T1 based on the size of I1. Then, the control system can know the temperature of each area of ​​the measured object 12. Since the heat-conducting medium 211 is in the heat transfer tube 21, and the heat transfer tube 21 is provided with multiple groups on the isolation tube 2, the control system can detect the temperature of the measured object 12 at different heights in the isolation tube 2 by the amount of heat absorbed by the heat-conducting medium 211. After that, the control system finds the range below the set temperature through data comparison, and then adjusts the position of the sliding ring A31 and the sliding ring B32 through the reset spring A25 and the reset spring B251. At this time, the current enters from the sliding ring A31, flows through the coil 3, and flows out from the sliding ring B32. The number of turns flowing through the coil 3 is the number of turns between the sliding ring A31 and the sliding ring B32, that is, the effective number of turns. After that, this section of the effective number of turns generates a magnetic field, so that the measured object 12 is heated in the range below the set temperature. Therefore, after the temperature is detected in the above manner, the range below the set temperature is locally heated, which is more energy-saving and efficient than overall heating, and the overall temperature of the measured object 12 is more accurate, and the test data is more accurate.

[0052] The working principle of the present invention is as follows: the start button on the control panel 1 is pressed to start the device. The threaded bosses are firstly processed at both ends of the test piece 12 through the external processing equipment. Then, the lower boss of the test piece 12 is connected with the threaded groove on the left lifting rod 13. Then, the stretching mechanism below the lifting rod 13 drives the lifting rod 13 to move upward, and the lifting rod 13 drives the test piece 12 to move upward to the middle position of the isolation tube 2. Then, the stretching mechanism above the fixing rod 14 drives the fixing rod 14 to move downward, so that the threaded groove on the lower side of the fixing rod 14 is connected with the threaded groove on the left side of the lifting rod 13. The upper side of the measured piece 12 is in contact, and the stretching mechanism above the fixing rod 14 drives the fixing rod 14 to rotate and move downward, so that the lower side of the fixing rod 14 is threadedly connected to the measured piece 12. At this time, the measured piece 12 is connected to the middle position of the isolation tube 2 by the fixing rod 14 and the lifting rod 13, that is, the middle position of the coil 3. Similarly, another measured piece 12 is installed in the right isolation tube 2. The measured piece 12 on the left is made of metal material, and the measured piece 12 on the right is made of non-metallic material, and the test temperature of the measured piece 12 on the left is greater than the test temperature of the measured piece 12 on the right.

[0053] After the test piece 12 is installed, a tensile test is performed on the test piece 12. The tensile mechanism pulls the fixed rod 14 and the lifting rod 13 to move to both sides respectively to stretch the test piece 12. The sensor in the tensile mechanism detects the deformation, torque and displacement of the test piece 12 in real time, and feeds the data back to the control system. The test piece 12 is heated at the same time. The sliding plate A and the sliding plate B are abutted against the middle position of the outer side of the isolation tube 2 by the return spring A25 and the return spring B251.

[0054] The control system passes alternating current into the coil 3 in the left isolation tube 2, and the first heating wire in the right isolation tube 2 is connected to the circuit by the control system. The coil 3 generates an alternating magnetic field. Since the left-side test piece 12 is made of metal, the alternating magnetic field generates eddy currents in the left-side test piece 12, thereby increasing the temperature of the test piece 12 and heating it to a set temperature. The set temperature is set in advance by the staff through the control panel 1. The first heating wire generates heat and transfers it to the right-side test piece 12, so that the right-side test piece 12 is heated to the set temperature. After that, the first heating wire and the coil 3 are powered off.

[0055] When the temperature of the tested object 12 rises, the heat of the tested object 12 is transferred to the heat-conducting medium 211 in the heat transfer tube 21. The heat-conducting medium 211 absorbs heat and expands. The pressure of the chamber where the heat-conducting medium 211 is located increases, and the electrode plate A22 and the electrode plate B23 form a capacitor. The heat-conducting medium 211 pushes the electrode plate B23 to move upward, so that the facing area between the electrode plate A22 and the electrode plate B23 becomes smaller. The facing area refers to the overlapping area between the electrode plate A22 and the electrode plate B23. Therefore, the capacity of the capacitor decreases, while the voltage and angular frequency at both ends of the electrode plate A22 and the electrode plate B23 remain unchanged, so the loop current formed by the electrode plate A22 and the electrode plate B23 will decrease;

[0056] When the temperature of the test piece 12 decreases, the heat of the heat-conducting medium 211 decreases, the pressure in the chamber where the heat-conducting medium 211 is located decreases, and the heat-conducting medium 211 will shrink. At this time, the pressure on the lower side of the electrode B23 is less than the pressure on the upper side. The external atmospheric pressure pushes the electrode B23 to move downward, and the facing area between the electrode A22 and the electrode B23 becomes larger, and the capacity of the capacitor increases. Similar to the upward movement of the above-mentioned electrode B23, the loop current connecting the electrode A22 and the electrode B23 will increase.

[0057] The control system determines the temperature of the test piece 12 on the side close to the heat-conducting medium 211 according to the magnitude of the current. Since there are multiple sets of heat-conducting media 211, heat transfer tubes 21, pole plates A22 and pole plates B23, and there are multiple sets of isolation tubes 2, lifting rods 13, fixing rods 14 and stretching mechanisms, a multi-station design is formed, and the heat transfer tubes 21 are installed on the isolation tubes 2 at equal intervals upward, the temperature of the test piece 12 can be detected all around. In the above manner, the system controls the magnitude of the current, and then determines the temperature of the test piece 12 at different heights to adjust the coordination of the coil 3, the sliding ring A31 and the sliding ring B32.

[0058] Afterwards, the control system determines which height range of the measured object 12 needs to be heated based on multiple sets of temperature data. The following takes a range on the upper layer of the measured object 12 as an example. The control system passes current into the reset spring A25, and the reset spring A25 will contract. The reset spring A25 pulls the sliding plate A to move upward, and the sliding plate A drives the sliding plate B to move upward, and the sliding plate B drives the sliding ring A31 to move upward. At this time, the reset spring B251 is released, and the reset spring B251 pushes the sliding ring B32 to move upward through the sliding plate B. Afterwards, the control system energizes the reset spring B251, and the reset spring B251 will be shortened, the reset spring B251 pulls the sliding ring B32 downward through the sliding plate B, and the adjustment distance of the sliding ring A31 and the sliding ring B32 is determined by the magnitude of the current respectively passed into the reset spring A25 and the reset spring B251. The control system adjusts the magnitude of the current in the reset spring A25 and the reset spring B251, and then adjusts the movement distance of the sliding ring A31 and the sliding ring B32. After that, the sliding ring A31 and the sliding ring B32 are adjusted by the control system, and the sliding ring A31 moves to the upper end of the tested part 12 that needs to be heated, and the sliding ring B32 moves to the lower end of the tested part 12 that needs to be heated;

[0059] After the slip ring A31 and the slip ring B32 are adjusted, the control system connects the slip ring A31 and the slip ring B32 to the circuit, and the current flows into the slip ring A31, passes through the coil 3 between the slip ring A31 and the slip ring B32, and flows out from the slip ring B32. The effective number of turns of the coil 3 is the number of turns between the slip ring A31 and the slip ring B32. When the current flows through the number of turns of the coil 3 between the slip ring A31 and the slip ring B32, the tested piece 12 within the range between the slip ring A31 and the slip ring B32 is heated. Through the above design, the temperature around the tested piece 12 is detected, and then the technical solution of locally heating the tested piece 12 is realized, which is more efficient and energy-saving, and the heating is more accurate, and the test accuracy is higher.

[0060] When the left-side test piece 12 and the right-side test piece 12 are tested at the same time, the set temperature of the left-side test piece 12 is greater than the set temperature of the right-side test piece 12. Due to the Seebeck effect, current will be generated in the Seebeck plate A33 in the left-side isolation tube 2 and the Seebeck plate B34 on the right side. The current flows through the Seebeck plate A33, the first wire and the metal sheet, another group of the first wire, the metal sheet and the Seebeck plate B34, and then flows into the control system through the first wire. After being processed by the control system, it is used for heating treatment of the first heating wire.

[0061] After the test pieces 12 on both sides complete the test, the control system feeds back the data on the control panel 1 for the staff to record and analyze. Afterwards, the upper stretching mechanism drives the test piece 12 to rotate so that the upper side of the test piece 12 is separated from the fixed rod 14. Afterwards, the lower stretching mechanism drives the test piece 12 to move downward, and the staff takes out the test piece 12. In this application, the stretching mechanism is the prior art.

[0062] Press the stop button on the control panel 1 to power off the testing machine.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatically coordinated multi-station high and low temperature creep endurance strength testing machine, characterized by: The invention comprises a shell (11), a lifting rod (13) is installed on the shell (11), an isolation tube (2) is installed above the lifting rod (13), a fixing rod (14) is installed above the isolation tube (2), a heat transfer tube (21) is installed outside the isolation tube (2), a plate A (22), a plate B (23) and a heat conducting medium (211) are installed inside the heat transfer tube (21), a coil (3) is installed inside the isolation tube (2), a sliding ring A (31) and a sliding ring B (32) are installed outside the coil (3), and the heat transfer tube (21) is installed inside the isolation tube (2). The lifting rod (13) is threadedly connected to the lower side of the measured object (12), the fixing rod (14) is threadedly connected to the upper side of the measured object (12), the heat conducting medium (211) adjusts the distance between the electrode plate A (22) and the electrode plate B (23), the electrode plate A (22) and the electrode plate B (23) cooperate to realize the temperature detection of the measured object (12), the fixing rod (14) and the lifting rod (13) cooperate to detect the deformation, displacement and torque of the measured object (12), and a control panel (1) is installed on the housing (11); The isolation cylinder (2) is provided with multiple groups, and the multiple groups of isolation cylinders (2) are installed on the outer shell (11) at equal intervals in sequence. A plurality of guide shafts (24) are vertically installed on the outer side of the isolation cylinder (2), and the guide shafts (24) are installed on the outer shell (11). Two groups of sliding plates A are slidably connected to each of the guide shafts (24). A return spring A (25) is connected to the upper sliding plate A, and a return spring B (251) is connected to the lower sliding plate A. One end of the return spring A (25) and the return spring B (251) are both installed on the outer shell (11). The inner walls of the sliding ring A (31) and the sliding ring B (32) are in contact with the outer side of the coil (3). The sliding plates B are installed on the outer sides of the sliding rings A (31) and the sliding rings B (32). The sliding plates B are slidably connected to the isolation cylinder (2), and the sliding plates B pass through the isolation cylinder (2) and are connected to the sliding plates A. The sliding ring A (31) and the sliding ring B (32) are both electrically connected to the control system. Both ends of the reset spring A (25) and the reset spring B (251) are both electrically connected to the control system. The sliding plate B is made of insulating material. The heat transfer tube (21) is provided with multiple groups. The multiple groups of heat transfer tubes (21) are installed on the isolation tube (2) at equal intervals from top to bottom. The pole plate A (22) is sleeved in the heat transfer tube (21). The pole plate A (22) is a sleeve structure. The pole plate B (23) is sleeved inside the pole plate A (22). The pole plate A (22) and the pole plate B (23) are both electrically connected to the control system. Both ends of the coil (3) are electrically connected to the control system. The coil (3) is installed on the isolation tube (2). The isolation tube (2) is made of insulating material. The interior of the isolation cylinder (2) is hollow, the fixing rod (14) passes through the upper side of the isolation cylinder (2), and the lifting rod (13) passes through the lower side of the isolation cylinder (2). The inner walls of the odd-numbered isolation cylinders (2) are provided with Seebeck plates A (33), and the inner walls of the even-numbered isolation cylinders (2) are provided with Seebeck plates B (34) and a first heating wire. The Seebeck plate B (34) is provided on one side of the first heating wire. One end of the Seebeck plate A (33) is connected to the Seebeck plate B (34) through a first wire and a metal sheet, and the other end of the Seebeck plate A (33) is connected to the Seebeck plate B (34) through another group of the first wire and the metal sheet. The first wire is electrically connected to a control system, and two adjacent groups of the first wire and the metal sheet are composed of different semiconductor materials. The first heating wire is electrically connected to a control system. The Seebeck plate A (33) and one side of the first heating wire are both provided with a first cooling wire, and the first cooling wire is electrically connected to the control system.

2. The automatic coordinated multi-station high and low temperature creep endurance strength testing machine according to claim 1 is characterized in that: The heat-conducting medium (211) is made of a thermally expandable material, the volume of the heat-conducting medium (211) when it does not absorb heat is V0, the height of the heat-conducting medium (211) when it does not absorb heat is h, the heating expansion coefficient of the heat-conducting medium (211) is α, the temperature of the heat-conducting medium (211) when it does not absorb heat is T0, and the temperature of the heat-conducting medium (211) after absorbing heat is T1; A capacitor C is formed between the electrode plate A (22) and the electrode plate B (23), the area of ​​the electrode plate A (22) and the electrode plate B (23) is S0, the vacuum dielectric constant between the electrode plate A (22) and the electrode plate B (23) is ε0, and the relative dielectric constant is ε r The outer diameter of the electrode plate B (23) is d, the inner diameter of the electrode plate A (22) is D, and the length of the electrode plate A (22) is L.

3. The automatic coordinated multi-station high and low temperature creep endurance strength testing machine according to claim 2 is characterized by: When the heat conducting medium (211) does not absorb heat, that is, T0=T1, the control system is based on C0=ε0ε r S0 / d, the capacitance of capacitor C is calculated as C0, and the control system is based on V0=vD 2 h, calculate the volume V0 of the heat conducting medium (211) when it does not absorb heat; When the heat conducting medium (211) absorbs heat, that is, T1>T0, the heat conducting medium (211) pushes the plate B (23) to move x, and the expansion amount of the heat conducting medium (211) is ΔV. The control system calculates V0=vD according to ΔV=V0α(T1-T0). 2 Substituting h into the equation, we get ΔV = vD 3 hα(T1-T0), since the expansion ΔV of the heat conducting medium (211) is equal to the volume change of the displacement x of the electrode plate B (23), ΔV=vD 2 x,πD 2 hα(T1-T0)=πD 2 x, and we get x=αh(T1-T0).

4. The automatic coordinated multi-station high and low temperature creep endurance strength testing machine according to claim 3 is characterized by: Control system based on Calculate the capacitance 5. The automatic coordinated multi-station high and low temperature creep endurance strength testing machine according to claim 4 is characterized by: The voltage across the pole plate A (22) and the pole plate B (23) is U, and the angular frequency is ω. The control system is based on I0 = UωC0, and then Substitute into the equation and calculate the current I0 when the heat conducting medium (211) does not absorb heat, The control system calculates the current I1 after the heat conducting medium (211) absorbs heat according to I1=UωC1, and then and Substituting in, we get After the control system calculates I1 and I0, it reversely derives T1. The control system can then know the temperature of each area of ​​the measured object (12).

6. The automatic coordinated multi-station high and low temperature creep endurance strength testing machine according to claim 5, comprising a stretching mechanism, characterized in that: The upper side of the fixed rod (14) is connected to a stretching mechanism, and the lower side of the lifting rod (13) is connected to another group of the stretching mechanisms. The stretching mechanisms are installed on the outer shell (11), and multiple groups of sensors are installed in the stretching mechanisms. The multiple groups of sensors are used to detect the deformation, displacement and torque of the measured object (12).

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