High-temperature air pressure bulging test clamp

Abstract

The invention discloses a high-temperature air pressure ballooning test fixture and an experiment system, and relates to the technical field of ballooning tests.The high-temperature air pressure ballooning test fixture comprises a rack, an upper fixture, a lower fixture, a heating assembly and a locking mechanism, the upper fixture is slidably sleeved with a vertically-arranged displacement ejector rod, a blasting groove is formed in the bottom of the upper fixture, and an airflow channel is formed in the lower fixture; an air outlet of the airflow channel is located in the top face of the lower clamp, a test piece is connected to the top face of the lower clamp in a sealed mode, one end of the locking mechanism is arranged on the rack, and the upper clamp and the lower clamp press the test piece between the air outlet of the airflow channel and the blasting groove through the locking mechanism. The lower end of the displacement ejector rod abuts against the test piece, the upper end of the displacement ejector rod is movably connected with a cross beam of the rack, and a heating assembly is arranged at the abutting position of the upper clamp and the lower clamp. The high-temperature air pressure expansion test clamp can solve the problems that existing high-temperature air pressure expansion test equipment is deficient, the sealing performance of the clamp is poor, the measurement precision is low and the safety coefficient is poor.

Description

Technical Field

[0001] The invention relates to the technical field of swelling test, in particular to a high-temperature gas pressure swelling test fixture. Background Art

[0002] Micro specimen testing technology has developed rapidly in the past thirty years, and the most eye-catching in this field is the small punch test technology. Now this technology has begun to be used to measure various mechanical parameters such as elastic-plastic properties, fracture toughness, ductile-brittle transition temperature of materials, and has also begun to play a role in creep and damage research. At present, there are mainly hydraulic bulging test devices and high-temperature gas pressure bulging test devices. The hydraulic bulging test device can only perform bulging tests on specimens at room temperature, which cannot meet the current experimental needs.

[0003] At present, the high-temperature gas pressure bulging test technology is a test technology for micro specimens under high temperature conditions. The test mechanism of gas pressure bulging is similar to that of bursting discs. It uses an air compressor to provide compressed air to the booster pump to pressurize the pressure vessel, and uses compressed air to drive the micro specimen to deform, and finally obtains a method of material properties. The specimen of the high-temperature gas pressure bulging technology usually uses a round disc with a diameter of 30mm and a thickness of 0.5mm. The sample is welded to the top of the lower fixture. After the sample is heated to a high temperature under high temperature conditions, compressed air is used for gas pressure deformation. The displacement of the displacement guide rod is measured by a laser extensometer, and the gas pressure that drives the sample to deform is measured by a pressure sensor to obtain the pressure-arch height curve, and then the strength information of the material is solved. After the specimen undergoes the gas pressure bulging test, the original round plate becomes convex. The thin sheet specimen is loaded with gas pressure to bulge and rupture, and the load-thin sheet center displacement curve is recorded in real time during the experiment. The strength information of metal materials can be further solved from the pressure displacement curve obtained from the high-temperature gas pressure bulging test.

[0004] However, the existing high temperature gas pressure expansion test equipment is scarce and has low safety. Therefore, it is urgent to design a new expansion test fixture to solve the problems of the existing technology. Summary of the invention

[0005] The purpose of the present invention is to provide a high temperature air pressure expansion test fixture to solve the problems existing in the above-mentioned prior art, so that the expansion test has high temperature conditions and improved safety performance.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a high-temperature gas pressure expansion test fixture, comprising a frame, an upper fixture, a lower fixture, a heating component and a locking mechanism, a sliding sleeve on the upper fixture is provided with a vertically arranged displacement push rod, a blasting groove is provided at the bottom of the upper fixture, an air flow channel is provided in the lower fixture, an air outlet of the air flow channel is located on the top surface of the lower fixture, a test piece is sealed and connected with the top surface of the lower fixture, one end of the locking mechanism is provided on the frame, the upper fixture and the lower fixture press the test piece between the air outlet of the air flow channel and the blasting groove through the locking mechanism, the lower end of the displacement push rod is abutted against the test piece, and the upper end is movably connected with the cross beam of the frame, the heating component is provided at the abutment between the upper fixture and the lower fixture, the air inlet of the air flow channel is used to connect the boosting component, and the displacement push rod is used to connect the displacement measuring component.

[0008] Preferably, the heating assembly comprises a heating sleeve and a temperature controller, a temperature sensor is arranged in the heating sleeve, and the temperature sensor is communicatively connected with the temperature controller.

[0009] Preferably, the locking mechanism includes an upper pressure plate, a lower pressure plate and a stud, the top of the upper clamp is connected to the threaded hole in the middle of the upper pressure plate by a thread, the positioning boss at the bottom of the lower clamp is inserted into the through hole in the middle of the lower pressure plate, and the upper pressure plate and the lower pressure plate are connected on both sides by the stud.

[0010] Preferably, the stud is a double-headed stud with locking nuts connected at both ends, and the stud is at least 20 cm long; the lower pressure plate is clamped in the step surface at the bottom of the frame, and a pair of fixing blocks are provided at the bottom of the frame, and the fixing blocks are provided with the step surfaces relatively.

[0011] Preferably, a spring locating pin is provided on the crossbeam at the top of the frame, and the spring locating pin conflicts with the top protrusion of the displacement push rod; the material of the frame, the upper clamp, the lower clamp and the locking mechanism includes stainless steel; the displacement push rod, the blasting groove, the outlet of the airflow channel are coaxially arranged with the specimen.

[0012] Preferably, the cross-sectional dimension of the blasting groove is larger than the cross-sectional dimension of the sliding hole of the displacement push rod in the upper clamp, and the depth of the blasting groove is at least 6 mm.

[0013] Preferably, the sliding hole of the displacement push rod in the upper clamp is a stepped groove, and a vertical guide assembly is arranged in the stepped groove. The vertical guide assembly includes two linear bearings and a positioning sleeve. The linear bearings are located at both ends of the positioning sleeve. The top of the stepped groove is threadedly connected to a threaded cover with a central hole, and the lower end of the threaded cover abuts against the linear bearing at the upper end; the outside of the upper clamp is provided with a clamping plane for the disassembly and assembly tool.

[0014] Preferably, a square boss is provided under the lower clamp, a plurality of cooling channels are opened on the square boss, a positioning boss is provided at the bottom, and both ends of the cooling channels are connected to the coolant through pipelines; a plurality of annular cooling grooves are provided on the outer wall of the lower clamp, and the depth of the cooling grooves increases from top to bottom, and the cooling grooves are located above the square boss.

[0015] Preferably, the air flow channel is a T-shaped channel, one end of the T-shaped channel is a blind hole, one end is an air inlet, and the other end is a vertically arranged air outlet, the blind hole and the air inlet are arranged in line, and the air inlet is connected to the boost pipeline through a threaded connection.

[0016] The present invention also discloses a high-temperature air pressure expansion test system, comprising the above-mentioned high-temperature air pressure expansion test fixture, a boosting component, a displacement measurement component and a control unit, the displacement push rod of the high-temperature air pressure expansion test fixture is connected to the displacement measurement component, the air inlet of the air flow channel is connected to the boosting component, the heating component, the boosting component and the displacement measurement component are all communicatively connected to the control unit; the boosting component comprises a boosting pump and an air compressor connected in sequence, the boosting pump is provided with a pressure sensor, and the pressure sensor is communicatively connected to the control unit; the displacement measurement component is a laser extensometer.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The high temperature gas pressure expansion test fixture of the present invention can solve the problems of the existing high temperature gas pressure expansion test equipment shortage, complicated sample welding and cutting procedures, poor fixture sealing performance, low measurement accuracy and poor safety factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1It is a structural schematic diagram of a high temperature air pressure expansion test fixture system in an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a high temperature air pressure expansion test fixture in an embodiment of the present invention;

[0022] Figure 3 It is a structural schematic diagram of an upper clamp in an embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the lower clamp in an embodiment of the present invention;

[0024] Figure 5 It is a structural schematic diagram of an upper pressing plate in an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the threaded cover in an embodiment of the present invention;

[0026] In the figure: 1-frame, 2-spring positioning pin, 3-displacement push rod, 4-stud, 5-upper pressure plate, 6-threaded cover, 7-linear bearing, 8-positioning sleeve, 9-positioning boss, 10-upper fixture, 11-lower fixture, 12-air flow channel, 13-blasting groove, 14-cooling groove, 15-clamping plane, 16-step groove, 17-cooling channel, 18-air inlet, 19-blind hole, 20-lower pressure plate, 21-test piece, 22-heating sleeve, 23-boosting pump, 24-air compressor, 25-temperature controller, 26-pressure sensor, 27-data acquisition card, 28-computer, 29-laser extensometer. DETAILED DESCRIPTION

[0027] 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.

[0028] The purpose of the present invention is to provide a high-temperature air pressure expansion test fixture to solve the problems existing in the prior art, so that the expansion test has high temperature conditions and improved safety performance.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Embodiment 1

[0031] like Figures 1 to 6As shown, a high-temperature gas pressure expansion test fixture is provided in this embodiment, including a frame 1, an upper fixture 10, a lower fixture 11, a heating component and a locking mechanism. A vertically arranged displacement push rod 3 is provided on the sliding sleeve of the upper fixture 10, a bursting groove 13 is provided at the bottom of the upper fixture 10, an air flow channel 12 is provided in the lower fixture 11, and an air outlet of the air flow channel 12 is located on the top surface of the lower fixture 11. A test piece 21 is sealed and connected to the top surface of the lower fixture 11. One end of the locking mechanism is provided on the frame 1. The upper fixture 10 and the lower fixture 11 press the test piece 21 between the air outlet of the air flow channel 12 and the bursting groove 13 through the locking mechanism. The lower end of the displacement push rod 3 abuts against the test piece 21, and the upper end is movably connected to the crossbeam of the frame 1. A heating component is provided at the abutment between the upper fixture 10 and the lower fixture 11. The air inlet 18 of the air flow channel 12 is used to connect the boosting component, and the displacement push rod 3 is used to connect the displacement measurement component.

[0032] As an optional solution, in this embodiment, the heating assembly includes a heating sleeve 22 and a temperature controller 25 . A temperature sensor is disposed in the heating sleeve 22 , and the temperature sensor is communicatively connected with the temperature controller 25 .

[0033] As an optional solution, the locking mechanism in this embodiment includes an upper pressing plate 5, a lower pressing plate 20 and a stud 4, the top of the upper clamp 10 is connected to the threaded hole in the middle of the upper pressing plate 5 by a thread, the positioning boss 9 at the bottom of the lower clamp 11 is inserted into the through hole in the middle of the lower pressing plate 20, and the upper pressing plate 5 and the lower pressing plate 20 are connected on both sides by the stud 4. In this embodiment, the positioning boss 9 is 35 mm long and 35 mm in diameter to ensure that it can be normally placed in the lower pressing plate 20 for positioning during the experiment, and the positioning boss 9 can be placed in the clamp in the lathe to ensure that the test piece 21 can be quickly removed.

[0034] As an optional solution, in this embodiment, the stud 4 is a double-headed stud and has locking nuts connected at both ends. The stud 4 is at least 20 cm long. In this embodiment, the stud 4 is 30 cm long, and the threads at both ends are about 5 cm long, which is convenient for adjusting the distance between the two pressure plates, thereby tightening the two clamps.

[0035] As an optional solution, in this embodiment, the lower pressing plate 20 is clamped in the step surface at the bottom of the frame 1. A pair of fixing blocks are provided at the bottom of the frame 1, and the fixing blocks are provided with step surfaces opposite to each other.

[0036] As an optional solution, a spring positioning pin 2 is provided on the crossbeam at the top of the frame 1 in this embodiment, and the spring positioning pin 2 conflicts with the top protrusion of the displacement push rod 3. When the pressure in the fixture pipeline reaches a certain value, the test piece 21 explodes, and the displacement guide rod rushes out of the fixture at the moment of explosion. At this time, part of the kinetic energy of the displacement guide rod is converted into spring potential energy and stored in the spring positioning pin 2. When the lower end of the spring positioning pin 2 is flush with its base, the displacement guide rod collides with the base, limiting it to this position, forming a protective device.

[0037] As an optional solution, in this embodiment, the material of the frame 1, the upper clamp 10, the lower clamp 11 and the locking mechanism includes stainless steel.

[0038] As an optional solution, in this embodiment, the displacement push rod 3, the blasting groove 13, the outlet of the air flow channel 12 and the test piece 21 are arranged coaxially.

[0039] As an optional solution, the cross-sectional dimension of the blasting groove 13 in this embodiment is larger than the cross-sectional dimension of the sliding hole of the displacement push rod 3 in the upper clamp 10, and the depth of the blasting groove 13 is at least 6 mm. In this embodiment, the notch of the blasting groove 13 is provided with a chamfer of R1.5 to prevent the sample from blasting around the ball.

[0040] As an optional solution, the sliding hole of the displacement push rod 3 in the upper fixture 10 in this embodiment is a stepped groove 16, and a vertical guide assembly is arranged in the stepped groove 16. The vertical guide assembly includes two linear bearings 7 and a positioning sleeve. The linear bearings 7 are located at both ends of the positioning sleeve to position and pre-tighten the two linear shafts. The top of the stepped groove 16 is threadedly connected with a threaded cover 6 with a central hole, and the lower end of the threaded cover 6 abuts against the linear bearing 7 at the upper end. The outer diameter of the flange of the threaded cover 6 should be smaller than the outer diameter of the upper fixture 10 so that the upper fixture 10 can be normally screwed into the upper pressure plate 5; the inner diameter of the positioning sleeve 8 should be larger than the diameter of the displacement push rod 3 to avoid friction between the displacement push rod 3 and the inner wall of the sleeve; the outer diameter of the two linear shafts should be the same as the inner diameter of the sliding hole in the upper fixture 10 to ensure its positioning accuracy. The minimum inner diameter of the sliding hole is 1-3mm smaller than the inner diameter of the linear bearing 7 to prevent friction between the boss and the displacement push rod 3 and affect the displacement data collection.

[0041] As an optional solution, in this embodiment, a clamping plane 15 for a disassembly tool is provided on the outside of the upper clamp 10 to ensure that the upper clamp 10 can be normally rotated out of the upper clamp plate.

[0042] As an optional solution, in this embodiment, a square boss is provided below the lower fixture 11, a plurality of cooling channels 17 are provided on the square boss, a positioning boss 9 is provided at the bottom, and both ends of the cooling channel 17 are connected to the coolant through pipelines. In this embodiment, four through holes with a diameter of 10 mm are provided in the middle of the square boss as the cooling channel 17, and both ends of the cooling channel 17 are connected to the quick connector and the cooling water pipeline to achieve cooling of the lower fixture 11, thereby ensuring the sealing of the gas adapter.

[0043] As an optional solution, in this embodiment, the outer wall of the lower fixture 11 is provided with a plurality of annular cooling grooves 14, the depth of which increases from top to bottom, and the cooling grooves 14 are located above the square boss. In this embodiment, three rectangular grooves are provided in the upper middle part of the lower fixture 11, and the depths thereof are 6mm, 7mm, and 8mm, respectively, which can reduce heat conduction and prevent partial heat radiation. Since the heating sleeve 22 is located at the center of the upper fixture 10 and the lower fixture 11, processing three grooves can prevent heat conduction and maximize the problem of poor sealing caused by inconsistent thermal expansion coefficients in the threaded connection between the lower fixture 11 and the high-pressure pipe. The depth of the cooling groove 14 increases from top to bottom. On the one hand, the processing depth is used to gradually reduce heat conduction and ensure the sealing of the threaded connection between the lower fixture 11 and the high-pressure pipe; on the other hand, since the sample needs to be turned off from the lower fixture 11 by a lathe after the sample is exploded, the depth of the cooling groove 14 increases from top to bottom to maximize the guarantee that the lower fixture 11 does not deform during the turning process.

[0044] As an optional solution, the air flow channel 12 in this embodiment is a T-shaped channel, one end of the T-shaped channel is a blind hole 19, one end is an air inlet 18, and the other end is a vertically arranged air outlet, the blind hole 19 and the air inlet 18 are arranged in a colinear manner, and the air inlet 18 is connected to the pressurization pipeline through a thread. In this embodiment, the blind hole 19 end of the air flow channel 12 has a buffering effect. When the air flow channel 12 is filled with high-pressure gas, the blind hole 19 can achieve a buffered reflux of the gas and reduce the instantaneous fluctuation of the gas pressure. Moreover, the blind hole 19 and the air inlet 18 are arranged in a colinear manner, and the high-pressure gas pipeline is connected to realize pressure loading on the sample.

[0045] The high temperature gas pressure expansion test fixture of this embodiment can solve the problems of the existing lack of high temperature gas pressure expansion test equipment, cumbersome sample welding and cutting procedures, poor fixture sealing performance, low measurement accuracy and poor safety factor. Most of the existing hydraulic expansion can only measure the mechanical properties of samples at room temperature. The data obtained from the mechanical property test at high temperature fluctuates greatly and the principle is complicated. The high temperature gas pressure expansion test device of this embodiment is easier to ensure the temperature of the sample than using medium water for pressurization, because the pressurized medium is compressed air, thereby improving the accuracy of the experimental data.

[0046] Embodiment 2

[0047] like Figure 1 As shown, this embodiment provides a high-temperature gas pressure expansion test system, including the above-mentioned high-temperature gas pressure expansion test fixture, booster assembly, displacement measurement assembly and control unit, the displacement push rod 3 of the high-temperature gas pressure expansion test fixture is connected to the displacement measurement assembly, the air inlet 18 of the air flow channel 12 is connected to the booster assembly, and the heating assembly, booster assembly and displacement measurement assembly are all connected to the control unit. In this embodiment, the heating assembly preferably includes a heating sleeve 22 and a separate temperature controller 25, and the temperature controller 25 can control the heating temperature separately; the control unit can select a computer 28, preferably a laptop computer.

[0048] As an optional solution, the boosting assembly in this embodiment includes a boosting pump 23 and an air compressor 24 connected in sequence. The boosting pump 23 is provided with a pressure sensor 26, and the pressure sensor 26 is communicatively connected with the control unit.

[0049] As an optional solution, the displacement measurement component in this embodiment is a laser extensometer 29 .

[0050] The specific operation process of the high temperature gas pressure expansion test system test piece detection experiment in this embodiment is as follows:

[0051] S1, compressed air is provided by the air compressor 24, and the compressed air is input to the booster pump 23, and the booster pump 23 outputs high-pressure air, and the high-pressure air is connected to the fixture through a high-pressure pipe, and finally drives the sample to deform.

[0052] S2, laser reflective paper is attached to the top of the displacement guide rod and the top crossbeam of the frame 1 (base). When the sample deforms and causes the displacement guide rod to move, the laser extensometer 29 measures the displacement of the guide rod (sample deformation) through the relative movement of the reflective paper. The measured displacement is input to the NI USB6210 data acquisition card 27. NI USB6210 is a commercially available data acquisition card product model.

[0053] S3, using the pressure sensor 26 to measure the pressure of the high-pressure gas in the pipeline. The pressure sensor 26 is installed at the high-pressure pipe connection near the fixture end, and the obtained pressure data is transmitted to the NI USB6210 data acquisition card 27.

[0054] S4, the pressure displacement data obtained by the NI USB6210 data acquisition card 27 is transmitted to the laptop computer via a USB data cable, and the data is collected by matlab to obtain an EXCEL table data, and then the data is processed to obtain a pressure-arch height curve.

[0055] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A high temperature air pressure expansion test fixture, characterized in that: The invention comprises a frame, an upper clamp, a lower clamp, a heating component and a locking mechanism, wherein a sliding sleeve on the upper clamp is provided with a vertically arranged displacement push rod, a blasting groove is provided at the bottom of the upper clamp, an air flow channel is provided in the lower clamp, an air outlet of the air flow channel is located on the top surface of the lower clamp, a test piece is sealed and connected with the top surface of the lower clamp, one end of the locking mechanism is provided on the frame, the upper clamp and the lower clamp press the test piece between the air outlet of the air flow channel and the blasting groove through the locking mechanism, the lower end of the displacement push rod abuts against the test piece, and the upper end is movably connected with the cross beam of the frame, the heating component is provided at the abutment between the upper clamp and the lower clamp, the air inlet of the air flow channel is used to connect the boosting component, and the displacement push rod is used to connect the displacement measuring component.

2. The high temperature air pressure expansion test fixture according to claim 1, characterized in that: The heating assembly comprises a heating sleeve and a temperature controller. A temperature sensor is arranged in the heating sleeve, and the temperature sensor is communicatively connected with the temperature controller.

3. The high temperature air pressure expansion test fixture according to claim 1, characterized in that: The locking mechanism includes an upper pressing plate, a lower pressing plate and a stud. The top of the upper clamp is connected to the threaded hole in the middle of the upper pressing plate by a thread. The positioning boss at the bottom of the lower clamp is inserted into the through hole in the middle of the lower pressing plate. The upper pressing plate and the lower pressing plate are connected on both sides by the stud.

4. The high temperature air pressure expansion test fixture according to claim 3, characterized in that: The stud is a double-headed stud with locking nuts connected at both ends, and the stud is at least 20 cm long; the lower pressure plate is clamped in the step surface at the bottom of the frame, and a pair of fixing blocks are provided at the bottom of the frame, and the fixing blocks are provided with the step surfaces opposite to each other.

5. The high temperature air pressure expansion test fixture according to claim 1, characterized in that: A spring locating pin is arranged on the crossbeam at the top of the frame, and the spring locating pin conflicts with the top protrusion of the displacement push rod; the material of the frame, the upper clamp, the lower clamp and the locking mechanism includes stainless steel; the displacement push rod, the blasting groove, the outlet of the air flow channel are arranged coaxially with the test piece.

6. The high temperature air pressure expansion test fixture according to claim 1, characterized in that: The cross-sectional dimension of the blasting groove is larger than the cross-sectional dimension of the sliding hole of the displacement push rod in the upper clamp, and the depth of the blasting groove is at least 6 mm.

7. The high temperature air pressure expansion test fixture according to claim 1, characterized in that: The sliding hole of the displacement push rod in the upper clamp is a stepped groove, and a vertical guide assembly is arranged in the stepped groove. The vertical guide assembly includes two linear bearings and a positioning sleeve. The linear bearings are located at both ends of the positioning sleeve. The top of the stepped groove is threadedly connected to a threaded cover with a central hole, and the lower end of the threaded cover abuts against the linear bearing at the upper end; the outside of the upper clamp is provided with a clamping plane for the disassembly and assembly tool.

8. The high temperature air pressure expansion test fixture according to claim 1, characterized in that: A square boss is arranged at the bottom of the lower clamp, a plurality of cooling channels are opened on the square boss, a positioning boss is arranged at the bottom, both ends of the cooling channels are connected with the coolant through pipelines; a plurality of annular cooling grooves are arranged on the outer wall of the lower clamp, the depth of the cooling grooves increases from top to bottom, and the cooling grooves are located above the square boss.

9. The high temperature air pressure expansion test fixture according to claim 1, characterized in that: The air flow channel is a T-shaped channel, one end of the T-shaped channel is a blind hole, one end is an air inlet, and the other end is a vertically arranged air outlet. The blind hole and the air inlet are arranged in a colinear manner, and the air inlet is connected to the boost pipeline through a thread.

10. A high temperature gas pressure expansion test system, comprising the high temperature gas pressure expansion test fixture, a pressurizing component, a displacement measurement component and a control unit according to any one of claims 1 to 9, characterized in that: The displacement measuring assembly is connected to the displacement push rod of the high-temperature air pressure expansion test fixture, the air inlet of the air flow channel is connected to the boosting assembly, the heating assembly, the boosting assembly and the displacement measuring assembly are all communicatively connected to the control unit; the boosting assembly includes a boosting pump and an air compressor connected in sequence, the boosting pump is provided with a pressure sensor, and the pressure sensor is communicatively connected to the control unit; the displacement measuring assembly is a laser extensometer.

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