Device and method for in-situ measurement and fatigue test of adiabatic temperature change of pressing and clamping material

Abstract

The invention relates to a device and method for adiabatic temperature change in-situ measurement and fatigue test of a pressing and clamping material, a pressing machine is internally provided with a pressing oil cylinder, a pressing assembly and a pressing block, the pressing assembly comprises a limiting sleeve, and a lower cushion block, a lower anvil, an upper anvil and an upper cushion block which are arranged in the limiting sleeve, and a pressing and clamping material sample comprises an upper sample hemisphere and a lower sample hemisphere; the upper sample hemisphere is arranged in an upper sample hemisphere groove at the lower end of the upper anvil, the lower sample hemisphere is arranged in a lower sample hemisphere groove at the upper end of the lower anvil, the front end of the thermocouple is arranged at the center between the upper sample hemisphere and the lower sample hemisphere, the rear end of the thermocouple is connected with the thermodetector, and a pressure sensor is arranged on the pressing oil cylinder and is controlled by the oil cylinder oil supply control system. According to the invention, the oil cylinder oil supply control system is used for controlling the pressure of the pressure applying oil cylinder in the press to change rapidly, and the thermocouple is used for directly measuring the center between the two sample hemispheres, so that the measurement accuracy can be ensured, the adiabatic temperature change can be close, and the fatigue performance test can be provided for materials.

Description

Technical Field

[0001] The invention relates to the field of compression material testing, in particular to a device and method for in-situ measurement and fatigue testing of adiabatic temperature variation of compression material. Background Art

[0002] Currently in my country's refrigeration field, traditional gas compression refrigeration has high energy consumption and is not environmentally friendly, while solid phase change refrigeration technology based on the thermal effect of materials is considered to be a new green, energy-saving and environmentally friendly refrigeration technology that is expected to replace traditional gas compression refrigeration technology.

[0003] The principle of solid-state phase change material refrigeration is mainly based on the characteristics of the material absorbing or releasing heat during the solid-solid phase change process. The thermal effects that drive the phase change of solid-state phase change materials mainly include magnetic card effect, spring card effect, electric card effect and pressure card effect, which are driven by magnetic field, uniaxial force, electric field and isostatic pressure respectively. Compared with magnetic card, spring card and electric card refrigeration technology, pressure card refrigeration material selection is wide, and the driving external force is easier to achieve and controllable, so pressure card refrigeration technology is easier to promote and apply in practice.

[0004] The compression effect refers to the phase change of a phase change material when it is subjected to a certain external isostatic water pressure, accompanied by the absorption or release of heat. Phase change materials with the compression effect are called compression materials. Compression refrigeration technology is to use isostatic water pressure to drive, pressurize or release the compression material to generate cold. For example, patent CN112940687B discloses a pressure-driven refrigeration method based on solid-liquid phase change materials, and patent CN114963598B discloses a compression refrigeration system based on expansion work recovery.

[0005] In the study of compression materials, adiabatic temperature change, isothermal entropy change and fatigue performance are important indicators to measure whether compression materials can be refrigerated, because they affect the refrigeration capacity of the material and whether cyclic refrigeration can be achieved. The measurement of adiabatic temperature change of compression materials requires the measuring device to provide isostatic water pressure and in-situ adiabatic measurement. The in-situ measurement of temperature change means that when pressure is applied to or released from the material, the temperature change signal can be measured at the same time without changing the measurement environment, making the measurement more accurate. Adiabatic measurement means that during the process of pressure change on the material, the material does not exchange heat with the outside world, and its temperature measurement is adiabatic measurement. However, in the actual measurement process, complete insulation is impossible to achieve, so the speed of pressure change and the speed of temperature signal measurement determine the accuracy of adiabatic temperature change measurement. For the fatigue performance test of compression materials, the device needs to be able to automatically and continuously pressurize the material multiple times.

[0006] The patent CN218547760U discloses a visual detection, demonstration and monitoring device for the heat storage process and performance of a card pressing material. However, the device is to fill the card pressing material and the thermochromic material into the corresponding areas respectively, and then use the heating unit and the cooling unit to prepare the card pressing material in the glass crystal state in situ, and then pressurize the internal card pressing material sample through the pressurizing element, thereby inducing the card pressing material to undergo a phase change to release heat. In this process, the device uses the characteristic that the color of the thermochromic material changes with temperature to realize the visual detection, demonstration and monitoring of the heat storage performance, storage and release process of the card pressing material sample. The device does not directly detect the card pressing material sample under the pressurized state. Summary of the invention

[0007] The purpose of the present invention is to provide a device and method for in-situ measurement and fatigue testing of adiabatic temperature change of pressed card materials. The device and method utilize an oil cylinder oil supply control system to control the rapid change of the pressure of the press cylinder in the press, and utilize a thermocouple to directly measure the center between two sample hemispheres, thereby ensuring the measurement accuracy and enabling it to be close to adiabatic temperature change. At the same time, the press cylinder of the present invention can automatically add and release pressure multiple times to provide fatigue performance testing for the material.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A device for in-situ measurement and fatigue testing of adiabatic temperature change of a card pressing material comprises a press, a thermometer and an oil cylinder oil supply control system, wherein a pressure cylinder, a pressure assembly and a pressure block are arranged in sequence from bottom to top inside the press, the pressure assembly comprises a limit sleeve and a lower pad, a lower anvil, an upper anvil and an upper pad which are arranged in sequence from bottom to top in the limit sleeve, the card pressing material sample to be tested comprises an upper and lower sample hemispheres, and the upper sample hemisphere is arranged in an upper sample hemisphere groove at the lower end of the upper anvil, and the lower sample hemisphere is arranged in a lower sample hemisphere groove at the upper end of the lower anvil, the front end of a thermocouple is arranged at the center between the upper sample hemisphere and the lower sample hemisphere, and the rear end is connected to the thermometer through a temperature measuring circuit, the limit sleeve is provided with an opening for the thermocouple to pass through, the pressure cylinder is provided with a pressure sensor and is controlled by the oil cylinder oil supply control system.

[0010] A sealing gasket is provided between the lower anvil and the upper anvil, and the lower end of the sealing gasket is fitted on the exposed part of the upper end of the lower sample hemisphere, and the upper end is fitted on the exposed part of the lower end of the upper sample hemisphere. The sealing gasket is provided with a slot for the thermocouple to pass through.

[0011] The upper end of the lower anvil and the lower end of the upper anvil are both in a convex cone shape.

[0012] The lower end of the limiting sleeve is sleeved on the upper end of the lower cushion block, and the upper end of the upper cushion block extends to the outside of the limiting sleeve.

[0013] The oil cylinder oil supply control system includes an oil pump and an oil pump control module, and the oil pump controls the oil supply to the pressure cylinder through the oil pump control module; the pressure sensor on the pressure cylinder is connected to the oil pump control module through a line, and the oil pump control module and the temperature meter are respectively connected to a computer system through lines.

[0014] A testing method according to the device for in-situ measurement and fatigue testing of adiabatic temperature change of a card pressing material comprises the following steps:

[0015] Step 1: Prepare the powdered card material sample into two upper and lower sample hemispheres;

[0016] Step 2: affixing several layers of heat-insulating material on the convex conical surface of the upper anvil and the convex conical surface of the lower anvil for heat insulation treatment;

[0017] Step 3: Place the lower pad on the pressure cylinder, then put the limit sleeve on the outside of the lower pad, and then put the lower anvil, lower sample hemisphere, gasket, thermocouple, upper sample hemisphere, upper anvil, and upper pad into the limit sleeve in sequence to complete the assembly of the pressure assembly;

[0018] Step 4: The pressure cylinder in the press is started to drive the pressure assembly upward until the upper pad is against the pressure block, and then the pressure cylinder continues to apply pressure, while the temperature meter and thermocouple are turned on to measure the temperature of the pressed material sample.

[0019] Step three is as follows:

[0020] Step 3.1: Place the protrusion of the lower anvil with the cone facing upward into the limit sleeve, and place the lower end of the lower anvil on the lower pad;

[0021] Step 3.2: Place the lower sample hemisphere into the lower sample hemisphere groove at the upper end of the lower anvil, and then place the seal at the upper end of the lower anvil and cover the exposed portion of the lower sample hemisphere;

[0022] Step 3.3: Place the front end of the thermocouple through the opening on the limiting sleeve and the slot on the sealing gasket and place it at the center of the upper end plane of the lower sample hemisphere;

[0023] Step 3.4: Place the lower end plane of the upper sample hemisphere into the sealing pad and place it on the upper end plane of the lower sample hemisphere;

[0024] Step 3.5: Place the upper anvil protrusion into the limit sleeve with the cone facing downward, and make the upper sample hemispherical groove at the lower end of the upper anvil buckle on the arc surface of the upper sample hemisphere;

[0025] Step 3.6: Place the lower end of the upper cushion block into the limiting sleeve and place it on the plane of the upper end of the upper anvil.

[0026] Step 4 is an adiabatic temperature change test of the card material sample under a single pressurization, and the measured adiabatic temperature change is based on the temperature change when the pressure cylinder is depressurized.

[0027] Step 4 is to perform an adiabatic temperature change test on the compression material sample at different pressures, and the adiabatic temperature change value at each pressure is taken as the temperature change value when the pressure cylinder is depressurized, and the phase change pressure of the compression material sample is determined according to the test results.

[0028] Step 4 is a fatigue performance test of the pressed card material sample, and the pressure cylinder applies pressure cyclically according to the set parameters and the number of cycles.

[0029] The advantages and positive effects of the present invention are:

[0030] 1. The present invention utilizes the oil cylinder oil supply control system to control the rapid change of the pressure of the pressure cylinder in the press, and utilizes the thermocouple to directly measure the center between the two sample hemispheres, thereby ensuring the measurement accuracy and enabling it to approach adiabatic temperature change.

[0031] 2. The present invention utilizes a pressure component to cooperate with the pressure application, while also ensuring that the thermocouple measurement position is accurate, wherein the position between the upper and lower sample hemispheres and the position of the thermocouple measurement front end will not move under the limit of the pressure component.

[0032] 3. The present invention utilizes program control to realize automatic cyclic pressurization and depressurization of the pressure cylinder, can measure the adiabatic temperature change of the material after multiple pressurization and depressurization, and can screen refrigeration materials with good fatigue performance for the press card refrigeration technology.

[0033] 4. The present invention can set corresponding parameters such as pressurization and pressure maintenance according to the actual characteristics of different test materials, and is flexible to use and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the connection relationship between the various parts of the present invention,

[0035] Figure 2 for Figure 1 The main view of the intermediate press.

[0036] Figure 3 for Figure 2 Schematic diagram of the exploded view of the pressure component.

[0037] Figure 4 for Figure 3 Schematic diagram of the working status of the component at A in the middle,

[0038] Figure 5 for Figure 4 The enlarged view of point B in the figure,

[0039] Figure 6Schematic diagram of adiabatic temperature change test results in a test example of the present invention,

[0040] Figure 7 is a schematic diagram of adiabatic temperature change under different pressures in another test example of the present invention,

[0041] Figure 8 This is a schematic diagram of fatigue test results in another test example of the present invention.

[0042] Among them, 1 is a press, 101 is a press frame, 102 is a pressure cylinder, 103 is a pressure assembly, 1031 is a limit sleeve, 10311 is an opening, 1032 is an upper pad, 1033 is an upper anvil, 10331 is an upper sample hemispherical groove, 1034 is a lower anvil, 10341 is a lower sample hemispherical groove, 1035 is a lower pad, 104 is a pressing block, 2 is a thermometer, 201 is a temperature measuring circuit, 3 is a cylinder oil supply control system, 4 is a computer system, 5 is a sample of the pressing material, 501 is a seal, and 6 is a thermocouple. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] like Figures 1 to 8 As shown, the present invention includes a press 1, a temperature measuring instrument 2 and a cylinder oil supply control system 3, wherein Figures 2 to 4 As shown, the press 1 is provided with a pressure cylinder 102, a pressure assembly 103 and a pressure block 104 from bottom to top in sequence, the pressure assembly 103 includes a limit sleeve 1031 and a lower pad 1035, a lower anvil 1034, an upper anvil 1033 and an upper pad 1032 arranged in the limit sleeve 1031 from bottom to top, the card material sample 5 to be tested includes an upper and lower sample hemisphere, and the upper sample hemisphere is arranged under the upper anvil 1033. The upper sample hemisphere groove 10331 at the end, the lower sample hemisphere is arranged in the lower sample hemisphere groove 10341 at the upper end of the lower anvil 1034, the front end of the thermocouple 6 is arranged at the center between the upper sample hemisphere and the lower sample hemisphere, and the rear end is connected to the thermometer 2 through the temperature measurement line 201, the limit sleeve 1031 is provided with an opening 10311 for the thermocouple 6 to pass through, and the pressure cylinder 102 is provided with a pressure sensor for real-time detection of applied pressure. In addition, the upper and lower parts of the compression material sample 5 are both hemispherical, because compared with other shaped samples, the spherical shape is easier to be evenly stressed, thus approaching isostatic water pressure, and applying isostatic water pressure is the premise for studying the compression effect.

[0045] like Figure 5As shown, in this embodiment, a gasket 501 is provided between the lower anvil 1034 and the upper anvil 1033, and the lower end of the gasket 501 is fitted on the exposed portion of the upper end of the lower sample hemisphere, and the upper end is fitted on the exposed portion of the lower end of the upper sample hemisphere. The gasket 501 is provided with a slot for the thermocouple 6 to pass through, and there is a sufficient distance between the slot wall and the thermocouple 6 to avoid affecting the test. The gasket 501 can prevent the upper and lower sample hemispheres from moving, resulting in inaccurate measurement positions of the thermocouple 6, and can also prevent the upper anvil 1033 from falling too much and damaging the thermocouple 6.

[0046] like Figure 4 As shown, in this embodiment, the upper end of the lower anvil 1034 and the lower end of the upper anvil 1033 are both in a convex cone shape.

[0047] like Figures 2-3 As shown, in this embodiment, the lower end of the limiting sleeve 1031 is sleeved on the upper end of the lower cushion block 1035, and the upper end of the upper cushion block 1032 extends to the outside of the limiting sleeve 1031 so as to be able to press against the pressing block 104 at the upper end inside the press 1.

[0048] like Figure 1 As shown, in this embodiment, the cylinder oil supply control system 3 includes an oil pump and an oil pump control module. The oil pump control module controls the oil pump to supply oil to the pressure cylinder 102, thereby controlling the size and rate of the pressure applied by the application cylinder 102 and the number of reciprocating extension and retraction times of the application cylinder 102 (fatigue test).

[0049] like Figure 1 As shown, in this embodiment, the pressure sensor on the pressure cylinder 102 is connected to the oil pump control module through a line, and the oil pump control module can realize automatic control and adjustment according to the feedback data of the pressure sensor. In addition, the oil pump control module and the temperature meter 2 are respectively connected to a computer system 4 through lines, so that relevant pressure, temperature and other parameters can be displayed in real time on the display screen of the computer system 4. In addition, the tester can also perform control operations through the computer system 4.

[0050] The thermocouple 6, pressure sensor, temperature measuring instrument 2 and oil cylinder oil supply control system 3 are all commercially available products.

[0051] The working principle of the present invention is:

[0052] The testing method of the present invention comprises the following steps:

[0053] Step 1: Prepare the powdered card pressing material sample 5 into two upper and lower sample hemispheres;

[0054] Step 2: affix several layers of heat-insulating material to the convex conical surface of the upper anvil 1033 and the convex conical surface of the lower anvil 1034 for heat insulation treatment. In this embodiment, the heat-insulating material is a parafilm insulating sealing film;

[0055] Step 3: Place the lower pad 1035 on the pressure cylinder 102, then put the limiting sleeve 1031 on the outer side of the upper end of the lower pad 1035, and then put the lower anvil 1034, the lower sample hemisphere, the sealing gasket 501, the thermocouple 6, the upper sample hemisphere, the upper anvil 1033, and the upper pad 1032 into the limiting sleeve 1031 in sequence to complete the assembly of the pressure assembly 103. The limiting sleeve 1031 is used to ensure that each component is placed in the correct position and the position will not be offset, thereby ensuring that the press 1 presses the card material sample 5 in the correct position.

[0056] The specific steps of this step are:

[0057] Step 3.1: If Figures 3 to 5 As shown, firstly, the lower anvil 1034 is placed into the limiting sleeve 1031 with the protruding cone facing upward, and the lower end of the lower anvil 1034 is placed on the lower pad 1035;

[0058] Step 3.2: If Figures 3 to 5 As shown, the lower sample hemisphere is placed in the lower sample hemisphere groove 10341 at the upper end of the lower anvil 1034, and then the seal 501 is placed on the upper end of the lower anvil 1034 and sleeved on the exposed part of the lower sample hemisphere. The seal 501 affects the sealing of the sample space and the distribution of force, and plays a role in limiting and locking.

[0059] Step 3.3: If Figures 3 to 5 As shown, the front end of the thermocouple 6 is passed through the opening 10311 on the limiting sleeve 1031 and the slot on the sealing gasket 501 and then placed at the center of the upper end plane of the lower sample hemisphere;

[0060] Step 3.4: If Figures 3 to 5 As shown, the lower end plane of the upper sample hemisphere is placed in the sealing gasket 501 and placed on the upper end plane of the lower sample hemisphere. Due to the existence of the thermocouple 6, if there is no sealing gasket 501 to limit the position, the upper and lower sample hemispheres are prone to movement, and thus it is impossible to ensure that the measurement position of the thermocouple 6 meets the requirements, and it is also not conducive to alignment and installation. The sealing gasket 501 can limit the positions of the upper and lower sample hemispheres, thereby ensuring that the measurement position of the thermocouple 6 meets the requirements and is convenient for installation;

[0061] Step 3.5: If Figures 3 to 5As shown, the upper anvil 1033 is placed into the limiting sleeve 1031 with the protruding cone facing downward, and the upper sample hemisphere groove 10331 at the lower end of the upper anvil 1033 is buckled on the arc surface of the upper sample hemisphere. At this time, through the limiting effect of the limiting sleeve 1031 and the sealing gasket 501, the upper anvil 1033 can be directly placed to ensure that it can be accurately docked with the upper sample hemisphere.

[0062] Step 3.6: If Figures 3 to 5 As shown, the lower end of the upper cushion block 1032 is placed in the limiting sleeve 1031 and placed on the plane of the upper end of the upper anvil 1033;

[0063] Step 4: The pressure cylinder 102 in the press 1 starts to drive the pressure assembly 103 to move upward until the upper pad 1032 abuts against the pressure block 104, and then the pressure cylinder 102 continues to apply pressure, and at the same time, the temperature meter 2 and the thermocouple 6 are turned on to measure the temperature of the pressed material sample 5.

[0064] In this step, different tests can be performed according to specific needs, including:

[0065] 1. Adiabatic temperature change test under single pressure.

[0066] In this test example, the applied pressure and the pressurization rate of the pressure cylinder 102 are controlled by the oil cylinder oil supply control system 3, wherein the oil cylinder oil supply control system 3 can control the applied pressure from 0.5MPa to 100Mpa within 3 to 5 seconds, and the pressure relief process from 100MPa to 0.5MPa only takes 1 to 2 seconds. Since the present invention is used for the study of the thermal effect of the card press, the speed of the pressure change and the speed of the temperature signal measurement determine the accuracy of the adiabatic temperature change measurement of the card press material. The present invention quickly controls the pressure change through the oil cylinder oil supply control system 3, reducing the heat exchange time between the sample and the outside world during the pressure change process. At the same time, the thermocouple 6 directly measures the center position between the two sample hemispheres, thereby ensuring the measurement accuracy and making it close to the adiabatic temperature change.

[0067] The sample in this test example is methyl ammonium iodide (CH3NH3I, MAI). The applied pressure is set to 200MPa and the pressurization rate is 18ml / min. Then click Start on the computer system 4. After the set time, click Decompression. The thermometer 2 will display and record the temperature change of this process. The measurement results are as follows: Figure 6 As shown, the vertical axis is temperature change (thermocouple 6 temperature data minus room temperature), and the horizontal axis is time. Figure 6 It can be seen that the pressure was applied at 100 seconds, and the sample temperature rose after the pressure was applied. The peak value of the pressure temperature change was about 3K, and then the temperature returned to room temperature because the pressure component 103 exchanged heat with the outside world while the pressure was maintained. The pressure was released at about 280 seconds, and the pressure release temperature change was about -13K. Figure 6 It can be seen that since the pressure relief rate is much greater than the pressure increase rate, the heat exchange time between the sample and the outside world is shorter, the measured temperature change is larger, and is closer to the true value. Therefore, when measuring the adiabatic temperature change of the compression material, the temperature change during pressure relief can be used as the standard, which is closer to the adiabatic temperature change. Figure 6 It can be concluded that when the sample MAI is pressurized to 220MPa, its adiabatic temperature change is about 13K.

[0068] 2. Adiabatic temperature change test under different pressures.

[0069] The sample in this test example is still methyl ammonium iodide (CH3NH3I, MAI), and the sample pressure is set to 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340 MPa in sequence, and its temperature change is measured. Three groups of identical experiments are performed, and the experimental results are as follows: Figure 7 As mentioned above, due to the greater pressure relief rate and smaller heat exchange with the outside world, the temperature change measurement value is closer to the true adiabatic temperature change value, so Figure 7 The vertical axis temperature change value ΔT is the temperature change value when the pressure is released, and the horizontal axis is the pressure. Figure 7 It can be seen that when the applied pressure increases from 40 to 125 MPa, the temperature change of the sample increases with the pressure, close to a linear relationship. From 130 to 225 MPa, the temperature change also increases nearly linearly with the pressure. However, when the pressure is around 125-130 MPa, the temperature change jumps. The reason is that the compression material undergoes a phase change near this pressure. The two phases before and after the phase change are different, and the relationship between the temperature change and the pressure will also be different. Therefore, Figure 7 It can be concluded that the phase transition pressure of the test sample MAI is around 125-130 MPa.

[0070] 3. Fatigue performance test.

[0071] The sample in this test example is para-carborane (C2B 10 H 12 ), click the "cycle" function on the control panel of the oil cylinder oil supply control system 3, set the applied pressure to 200MPa, the number of cycles to 100, the pressurization time to 10s, the pressure holding time to 40s, select quick pressure relief, and the pressure holding time after pressure relief is 40s. The test results are as follows Figure 8 As shown, the horizontal axis is time and the vertical axis is temperature change. Figure 8It can be seen that in each pressure-adding and unloading cycle, the temperature change has the same trend as the pressure change, and the temperature change amplitude is slightly different in each cycle. According to the temperature change value of the sample after pressure-adding and unloading, the temperature change amplitude slightly decays with the increase of the number of cycles. After 100 pressure-adding and unloading cycles, the temperature change value of this sample is still 7K, which shows that the fatigue performance of this material is excellent.

Claims

1. A device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials, characterized in that: The invention comprises a press (1), a temperature measuring instrument (2) and an oil cylinder oil supply control system (3), wherein the press (1) is provided with a pressure cylinder (102), a pressure assembly (103) and a pressure block (104) in order from bottom to top, the pressure assembly (103) comprises a limit sleeve (1031) and a lower pad (1035), a lower anvil (1034), an upper anvil (1033) and an upper pad (1032) arranged in the limit sleeve (1031) in order from bottom to top, and a card material sample (5) to be tested comprises two upper and lower sample hemispheres, and the upper sample hemisphere The thermocouple (6) is arranged in an upper sample hemisphere groove (10331) at the lower end of the upper anvil (1033), and the lower sample hemisphere is arranged in a lower sample hemisphere groove (10341) at the upper end of the lower anvil (1034). The front end of the thermocouple (6) is arranged at the center between the upper sample hemisphere and the lower sample hemisphere, and the rear end is connected to the temperature measuring instrument (2) through a temperature measuring circuit (201). The limit sleeve (1031) is provided with an opening (10311) for the thermocouple (6) to pass through. The pressure cylinder (102) is provided with a pressure sensor and is controlled by the cylinder oil supply control system (3).

2. The device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials according to claim 1 is characterized in that: A sealing gasket (501) is provided between the lower anvil (1034) and the upper anvil (1033), and the lower end of the sealing gasket (501) is fitted over the exposed portion of the upper end of the lower sample hemisphere, and the upper end is fitted over the exposed portion of the lower end of the upper sample hemisphere. The sealing gasket (501) is provided with a groove for the thermocouple (6) to pass through.

3. The device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials according to claim 2 is characterized in that: The upper end of the lower anvil (1034) and the lower end of the upper anvil (1033) are both in the shape of a raised cone.

4. The device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials according to claim 1 is characterized in that: The lower end of the limiting sleeve (1031) is sleeved on the upper end of the lower cushion block (1035), and the upper end of the upper cushion block (1032) extends to the outside of the limiting sleeve (1031).

5. The device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials according to claim 1 is characterized in that: The oil cylinder oil supply control system (3) comprises an oil pump and an oil pump control module, and the oil pump is controlled by the oil pump control module to supply oil to the pressure cylinder (102); the pressure sensor on the pressure cylinder (102) is connected to the oil pump control module via a line, and the oil pump control module and the temperature measuring instrument (2) are respectively connected to a computer system (4) via a line.

6. A testing method for the device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials according to claim 3, characterized in that: The steps include: Step 1: preparing a powdered card pressing material sample (5) into two upper and lower sample hemispheres; Step 2: affixing several layers of heat-insulating material to the convex conical surface of the upper anvil (1033) and the convex conical surface of the lower anvil (1034) for heat insulation treatment; Step 3: Place the lower pad (1035) on the pressure cylinder (102), then put the limiting sleeve (1031) on the outside of the lower pad (1035), and then put the lower anvil (1034), the lower sample hemisphere, the sealing gasket (501), the thermocouple (6), the upper sample hemisphere, the upper anvil (1033), and the upper pad (1032) into the limiting sleeve (1031) in sequence to complete the assembly of the pressure assembly (103); Step 4: The pressure cylinder (102) in the press (1) starts to drive the pressure assembly (103) to move upward until the upper pad (1032) abuts against the pressure block (104), and then the pressure cylinder (102) continues to apply pressure, while the temperature meter (2) and the thermocouple (6) are turned on to measure the temperature of the pressed material sample (5).

7. The testing method of the device for in-situ measurement and fatigue testing of adiabatic temperature change of compression materials according to claim 6, characterized in that: Step three is as follows: Step 3.1: Place the lower anvil (1034) with its protruding cone facing upward into the limiting sleeve (1031), and place the lower end of the lower anvil (1034) on the lower pad (1035); Step 3.2: Place the lower sample hemisphere into the lower sample hemisphere groove (10341) at the upper end of the lower anvil (1034), and then place the seal (501) at the upper end of the lower anvil (1034) and fit it over the exposed portion of the lower sample hemisphere; Step 3.3: Pass the front end of the thermocouple (6) through the opening (10311) on the limiting sleeve (1031) and the slot on the sealing gasket (501) and place it at the center of the upper end plane of the lower sample hemisphere; Step 3.4: Place the lower end plane of the upper sample hemisphere into the sealing pad (501) and place it on the upper end plane of the lower sample hemisphere; Step 3.5: Place the upper anvil (1033) with its protruding cone facing downward into the limiting sleeve (1031), and place the upper sample hemispherical groove (10331) at the lower end of the upper anvil (1033) on the arc surface of the upper sample hemisphere; Step 3.6: Place the lower end of the upper cushion block (1032) into the limiting sleeve (1031) and place it on the plane of the upper end of the upper anvil (1033).

8. The testing method of the device for in-situ measurement and fatigue testing of adiabatic temperature change of compression materials according to claim 6, characterized in that: Step 4 is to test the adiabatic temperature change of the card material sample (5) under a single pressurization, and the measured adiabatic temperature change is based on the temperature change when the pressure cylinder (102) is depressurized.

9. The testing method of the device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials according to claim 6, characterized in that: Step 4 is to perform an adiabatic temperature change test on the compression material sample (5) at different pressures, and the adiabatic temperature change value at each pressure is taken as the temperature change value when the pressure cylinder (102) is depressurized, and the phase change pressure of the compression material sample (5) is determined based on the test results.

10. The testing method of the device for in-situ measurement and fatigue testing of adiabatic temperature change of card pressing materials according to claim 6, characterized in that: Step 4 is a fatigue performance test of the pressed material sample (5), wherein the pressure cylinder (102) applies pressure cyclically according to the set parameters and the number of cycles.

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