Ultrahigh-cycle fatigue performance testing device

Abstract

The utility model discloses an ultra-high cycle fatigue performance test device. The ultra-high cycle fatigue performance test device comprises a test cavity and at least two environment simulation devices. The test cavity is provided with a cavity used for placing a test piece. Each environment simulation device comprises a cover plate detachably connected to the test cavity and an environment simulator connected with the cover plate. The cover plate has a communication hole in fluid communication with the cavity. The environment simulator is in fluid communication with the communication hole to input a simulation medium in the environment simulator into the cavity. Wherein at least one of the at least two environment simulation devices is selectively connected to the test cavity through a cover plate of the at least one environment simulation device. The ultra-high cycle fatigue performance test device provided by the utility model reduces the cost.

Description

Technical Field

[0001] The utility model relates to an ultra-high cycle fatigue performance test device. Background Art

[0002] Material testing refers to the determination of the performance and characteristics of materials in aspects such as mechanics, thermology, electricity, corrosion, radiation, and biological degradation. In many industries, the selection of materials plays a crucial role. Especially for new materials, the mechanical properties of new materials (such as metals, alloys, concrete, polymers, ceramics, molded plastics, or composite materials) are crucial for achieving the best safety, durability, flexibility, strength-to-weight ratio, performance, reliability, and cost-effectiveness.

[0003] Therefore, it is necessary to test the characteristics of materials, such as stress, strain, tensile modulus, and Poisson's ratio, by simulating the actual use environment.

[0004] When the existing performance test devices are used to test the ultra-high cycle fatigue performance of materials, a variety of devices need to be prepared to test the performance of materials under different simulated environments during use, but this is costly.

[0005] It should be noted here that the statements in this background art section only provide background art related to the utility model and do not necessarily constitute prior art. Summary of the Utility Model

[0006] The utility model provides an ultra-high cycle fatigue performance test device to reduce the test cost.

[0007] The utility model provides an ultra-high cycle fatigue performance test device, including:

[0008] A test cavity having a cavity for placing a test piece;

[0009] At least two environment simulation devices, each environment simulation device including a cover plate detachably connected to the test cavity and an environment simulator connected to the cover plate. The cover plate has a communication hole in fluid communication with the cavity, and the environment simulator is in fluid communication with the communication hole to input the simulation medium in the environment simulator into the cavity;

[0010] Wherein, at least one of the at least two environment simulation devices is selectively connected to the test cavity through its own cover plate.

[0011] In some embodiments, the environmental simulator includes a first environmental simulator, which includes an air storage tank, an erosion liquid storage tank, a salt spray storage tank, and a switching device. The air storage tank is used to deliver air to the cavity of the test chamber. The erosion liquid storage tank is used to deliver erosion liquid to the cavity of the test chamber. The salt spray storage tank is used to deliver salt spray to the cavity of the test chamber. The switching device is configured to control at least one of the air storage tank, the erosion liquid storage tank, and the salt spray storage tank to be in fluid communication with the test chamber.

[0012] In some embodiments, the first environmental simulator further includes an air compressor connected to the air storage tank. The air compressor is used to compress the air in the air storage tank to increase the pressure.

[0013] In some embodiments, the first environmental simulator further includes a dryer disposed between the air storage tank and the cavity. The dryer is used to dry the air output from the air storage tank.

[0014] In some embodiments, the environmental simulator includes a second environmental simulator, which includes a negative pressure pump and a positive pressure pump. The negative pressure pump is used to create a negative pressure environment in the cavity, and the positive pressure pump is used to create a positive pressure environment in the cavity.

[0015] In some embodiments, the second environmental simulator further includes a medium storage tank, which is connected to the positive pressure pump.

[0016] In some embodiments, the environmental simulator includes a third environmental simulator, which includes a heating coil and a power supply element. The heating coil is disposed inside the cover plate to heat the cavity, and the heating coil is configured as an annular structure to surround the outside of the test piece.

[0017] In some embodiments, the very high cycle fatigue performance test device further includes a displacement amplifier, which is disposed through the wall thickness direction of the test chamber. The first end of the displacement amplifier penetrates into the cavity and is connected to the test piece, and the second end of the displacement amplifier penetrates out of the outside of the cavity.

[0018] In some embodiments, the very high cycle fatigue performance test device further includes a signal transmitter and a computer. The signal transmitter is electrically connected to the displacement amplifier to send the displacement signal of the displacement amplifier to the computer.

[0019] In some embodiments, the very high cycle fatigue performance test device further includes a discharge pipe connected to the bottom end of the test chamber. The discharge pipe is used to discharge the simulated medium after the test is completed.

[0020] Based on the technical solution provided by the present utility model, the very high cycle fatigue performance test device includes a test cavity and at least two environment simulation devices. The test cavity has a cavity for placing a test piece. Each environment simulation device includes a cover plate detachably connected to the test cavity and an environment simulator connected to the cover plate. The cover plate has a communication hole that is in fluid communication with the cavity. The environment simulator is in fluid communication with the communication hole to input the simulation medium in the environment simulator into the cavity. Among them, at least one of the at least two environment simulation devices can be selectively connected to the test cavity through its own cover plate. The very high cycle fatigue performance test device provided by the embodiment of the present utility model reduces costs compared with the prior art that requires preparing multiple devices by setting at least two environment simulation devices, and the at least two environment simulation devices can be detachably connected to the test cavity through their own cover plates, so that different test environments can be simulated by disassembling and assembling the cover plates to replace different environment simulation devices according to the performance requirements of the test piece to be detected during use.

[0021] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings described herein are used to provide a further understanding of the present utility model, and constitute a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0023] Figure 1 It is a schematic structural diagram of the very high cycle fatigue performance test device according to some embodiments of the present utility model.

[0024] Figure 2 It is a schematic structural diagram of the environment simulator according to some embodiments of the present utility model.

[0025] Figure 3 It is a schematic structural diagram of the environment simulator according to other embodiments of the present utility model.

[0026] Figure 4 It is a schematic structural diagram of the environment simulator according to still other embodiments of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0029] For the sake of description, spatial relative terms, such as "above", "over", "on the upper surface of", "above", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, the device described as "above other devices or structures" or "over other devices or structures" will then be oriented "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may be otherwise oriented, and corresponding interpretations may be made for the spatial relative descriptions used herein.

[0030] Reference Figures 1 to 4, an embodiment of the present utility model provides an ultra-high cycle fatigue performance test device, which includes a test cavity 10 and at least two environment simulation devices 80. The test cavity 10 has a cavity for placing a test piece. Each environment simulation device 80 includes a cover plate 800 detachably connected to the test cavity 10 and an environment simulator connected to the cover plate 800. The cover plate 800 has a communication hole in fluid communication with the cavity. The environment simulator is in fluid communication with the communication hole to input the simulation medium in the environment simulator into the cavity. Among them, at least one of the at least two environment simulation devices 80 is selectively connected to the test cavity 10 through its own cover plate 800.

[0031] The ultra-high cycle fatigue performance test device provided by the embodiment of the present utility model is provided with at least two environment simulation devices 80, and at least two environment simulation devices 80 can be detachably connected to the test cavity 10 through their own cover plates 800. In this way, during use, according to the performance requirements of the test piece to be detected, different environment simulation devices can be replaced by disassembling and assembling the cover plate 800 to simulate different test environments. Compared with the prior art that requires preparing multiple devices, the cost is reduced.

[0032] As Figure 1 shown, the cover plate 800 is detachably connected to the test cavity 10. Moreover, the cover plate 800 is connected with an environment simulator through a connecting pipe. Therefore, by disassembling and assembling the cover plate 800, the fluid communication between different environment simulators and the inner cavity of the test cavity 10 can be realized, and then different simulation media can be input into the cavity of the test cavity 10 to test the performance of the test piece under different test environments.

[0033] In Figure 1 the specific embodiment shown, the test cavity 10 is a cylindrical cavity. In other embodiments, the test cavity 10 can also be of other shapes. The test cavity 10 has an opening formed on the cavity wall. The cover plate 800 is detachably connected to the opening. And the cover plate 800 has a communication hole, and the connecting pipe connects the communication hole with the environment simulator. In this way, the simulation medium output by the environment simulator can be transported into the cavity of the test cavity 10 through the connecting pipe and the communication hole. Specifically, in Figure 1 the embodiment shown, the cover plate 800 is a square plate. However, in other embodiments, the cover plate 800 can also be of other shapes. The four corners of the square plate are connected to the cavity wall of the test cavity 10 through connecting pieces such as bolts.

[0034] Refer to Figure 2, in some embodiments, the environmental simulator includes a first environmental simulator. The first environmental simulator includes an air storage tank 802, an erosion liquid storage tank 804, a salt spray storage tank 805, and a switching device. The air storage tank 802 is used to deliver air to the cavity of the test chamber 10. The erosion liquid storage tank 804 is used to deliver erosion liquid to the cavity of the test chamber 10. The salt spray storage tank 805 is used to deliver salt spray to the cavity of the test chamber 10. The switching device is configured to control at least one of the air storage tank 802, the erosion liquid storage tank 804, and the salt spray storage tank 805 to be in fluid communication with the test chamber 10.

[0035] In the first environmental simulator of the embodiment of the present utility model, by setting the air storage tank 802 as the air source, and setting the erosion liquid storage tank 804 and the salt spray storage tank 805 as the liquid sources, the action of the switching device is controlled to realize the influence of different air source media and liquid source media on the material properties of the test piece.

[0036] In some embodiments, the first environmental simulator further includes an air compressor 801 connected to the air storage tank 802. The air compressor 801 is used to compress the air in the air storage tank 802 to increase the pressure. By the action of the air compressor 801, different air pressures can be shown, and further the performance of the test piece under different air pressures can be tested.

[0037] In order to avoid the adverse effect of moisture in the air on the performance test of the test piece, in some embodiments, the first environmental simulator further includes a dryer 803 provided between the air storage tank 802 and the cavity. The dryer 803 is used to dry the air output from the air storage tank 802. That is, the air output into the cavity will first pass through the drying of the dryer 803 and then enter the cavity, so as to realize the performance test of the test piece under dry air.

[0038] Reference Figure 3 , in some embodiments, the environmental simulator 80 includes a second environmental simulator. The second environmental simulator includes a negative pressure pump 811 and a positive pressure pump 812. The negative pressure pump 811 is used to create a negative pressure environment in the cavity. The positive pressure pump 812 is used to create a positive pressure environment in the cavity. By the operation of the positive pressure pump 812 or the negative pressure pump 811, a vacuum environment or a high-pressure environment can be simulated in the cavity of the test chamber 10, so as to realize the performance test of the material in the vacuum and high-pressure environments.

[0039] In some embodiments, the second environmental simulator further includes a medium storage tank 813. The medium storage tank 813 is connected to the positive pressure pump 812. For example, different gases can be stored in the medium storage tank 813, and further the performance of the test piece under the high-pressure environment of different gases can be tested.

[0040] ReferenceFigure 4 , in some embodiments, the environmental simulator includes a third environmental simulator. The third environmental simulator includes a heating coil 821 and a power supply element 822. Among them, the heating coil 821 is disposed inside the cover plate 800 to heat the cavity. And the heating coil 821 is configured as an annular structure to surround the outside of the test piece. By using the above heating coil 821, the heating coil 821 is controlled by the power supply element 822 to simulate a high-temperature environment, so as to perform performance tests on the test piece under a high-temperature environment.

[0041] In some embodiments, the very high cycle fatigue performance test device further includes a displacement amplifier 30. The displacement amplifier 30 is disposed through the wall thickness direction of the test cavity 10. And the first end of the displacement amplifier 30 penetrates into the cavity and is connected to the test piece, and the second end of the displacement amplifier 30 penetrates out of the outside of the cavity. One end of the displacement amplifier 30 is inserted into the middle of the cavity, and the test piece is connected to one end of the displacement amplifier 30, so it is convenient for testing.

[0042] In some embodiments, the very high cycle fatigue performance test device further includes a signal transmitter 50 and a computer 60. The signal transmitter 50 is electrically connected to the displacement amplifier 30 to be used for sending the displacement signal of the displacement amplifier 30 to the computer 60. The upper end of the displacement amplifier 30 is connected to the signal transmitter 50, and the signal transmitter 50 is electrically connected to the computer 60 through a connection line.

[0043] In some embodiments, the very high cycle fatigue performance test device further includes a discharge pipe 40 connected to the bottom end of the test cavity 10. The discharge pipe 40 is used for discharging the simulated medium after the test is completed. The very high cycle fatigue performance test device of the present invention realizes the performance test of the test piece under different simulated environments by setting at least two detachably arranged environmental simulation devices 80. Therefore, after one test is completed and before the next test, it is necessary to empty the simulated medium in the cavity of the test cavity 10 for replacement to avoid the adverse impact of the simulated medium of the previous test on the next test. The test device of the embodiment of the present invention realizes the complete discharge of the simulated medium after the test by setting the discharge pipe 40 at the bottom end of the test cavity 10.

[0044] In order to further prevent the mutual influence between the simulated media, in some embodiments, the test device further includes a cleaning mechanism, and the cleaning structure is used for cleaning the inner cavity of the test cavity 10.

[0045] Next, according to Figures 1 to 4 The structure of the very high cycle fatigue performance test device of a specific embodiment of the present invention will be described in detail.

[0046] As Figure 1As shown, the very high cycle fatigue performance test device of this embodiment includes a test cavity 10, a sealing cover 20, a displacement amplifier 30, a discharge pipe 40, a signal transmitter 50, a computer 60, and at least two environmental simulation devices 80.

[0047] Among them, Figure 1 Shown is a schematic diagram of one of the environmental simulation devices 80 connected to the environmental cavity 10 through a detachably connected cover plate 800.

[0048] The at least two environmental simulation devices 80 of this embodiment include a first environmental simulation device, a second environmental simulation device, and a third environmental simulation device. Each environmental simulation device includes a cover plate 800 and an environmental simulator connected to the cover plate 800.

[0049] The structure of the environmental simulator corresponding to each environmental simulation device will be described in detail below.

[0050] As Figure 2 shown, the first environmental simulation device includes a first environmental simulator. The first environmental simulator includes an air compressor 801, an air storage tank 802, a dryer 803, an erosion liquid storage tank 804, a salt spray storage tank 805, and a corrosion experiment pump 806.

[0051] The cover plate 800 is connected with an erosion liquid storage tank 804, a salt spray storage tank 805, and a dryer 803 through a connecting pipe. One side of the dryer 803 is connected with an air storage tank 802 and an air compressor 801 through a pipeline. The salt spray storage tank 805 and the erosion liquid storage tank 804 are connected with the cover plate 800 through a corrosion experiment pump 806 and a valve and a pipeline. The air compressor 801, the air storage tank 802, and the dryer 803 form an air source, and the erosion liquid storage tank 804 and the salt spray storage tank 805 are liquid sources. The air source and the liquid source are both communicated with the test cavity 10 through valves and pipelines. Through the operation of the corrosion experiment pump 806, different media in the erosion liquid storage tank 804 and the salt spray storage tank 805 are sprayed onto the test piece in the inner cavity of the test cavity 10, so as to test the influence of different media on the material performance.

[0052] With the above-mentioned air compressor 801, air storage tank 802, dryer 803, and corrosion experiment pump 806, during use, the media in the erosion liquid storage tank 804 and the salt spray storage tank 805 are introduced into the inner cavity of the test cavity 10 through the operation of the corrosion experiment pump 806, and the corrosion resistance performance of the test piece is tested.

[0053] Furthermore, it can be referred to Figure 1, the sealing cover 20 is arranged in a double-layer structure, and the lower layer of the sealing cover 20 is hermetically connected to the test cavity 10. The upper layer of the sealing cover 20 is fixed to the lower layer, and the middle part of the lower layer of the sealing cover 20 is hollow. The displacement amplifier 30 is hermetically connected to the upper side of the sealing cover 20. When in use, the sealing cover 20 is installed on the test cavity 10 and is kept sealed at the connection with the displacement amplifier 3.

[0054] Further, refer to Figure 1 , the outer surface of the test cavity 10 can be selectively connected to the cover plate 800 of one of at least two environmental simulation devices 80, and an environmental simulator is arranged on each cover plate 800. Therefore, through a plurality of cover plates 800, a plurality of different environmental simulators can be installed, so as to simulate a composite environment to test the material.

[0055] As Figure 3 shown, the second environmental simulation device includes a second environmental simulator. The second environmental simulator includes a negative pressure pump 811, a positive pressure pump 812 and a medium storage tank 813. The cover plate 800 is respectively connected to the negative pressure pump 811 and the positive pressure pump 812 through pipelines and valves. The other ends of the negative pressure pump 811 and the positive pressure pump 812 are connected to the discharge pipe. The negative pressure pump 811 and the positive pressure pump 812 are connected to the medium storage tank 813 through pipelines, and the upper end of the medium storage tank 813 is communicated with the negative pressure pump 811 and the positive pressure pump 812 through a multi-way joint.

[0056] By adopting the above-mentioned medium storage tank 813, during use, through the operation of the negative pressure pump 811 and the positive pressure pump 812, a vacuum or high-pressure environment can be simulated in the inner cavity of the test cavity 10, so that the performance of the material can be tested under vacuum and high-pressure environments.

[0057] As Figure 4 shown, the third environmental simulation device includes a third environmental simulator. The third environmental simulator includes a heating coil 821 and a power supply element 822. The heating coil 821 is installed inside the cover plate 800, and the heating coil 821 is connected to the power supply element 822 through a connecting wire passing through the cover plate 800. The heating coil 821 is located outside the lower end of the displacement amplifier 30 to form a heating element, and an insulating pad is arranged at the connection between the heating coil 821 and the cover plate 800.

[0058] By adopting the above-mentioned heating coil 821, during use, the heating coil 821 is installed in the test cavity 10, and the heating coil 821 is controlled by the power supply element 822 to simulate a high-temperature environment, so as to test the performance of the material in a high-temperature environment.

[0059] During use, according to the needs of different performance tests, different environmental simulators are installed on the test chamber 10 by disassembling and assembling the cover plate 800. Moreover, a group or multiple groups of environmental simulators can be installed simultaneously through multiple cover plates, so as to simulate the performance of materials in a variety of composite environments. During use, through the operation of the corrosion experiment pump 806, different media in the erosion liquid storage tank 804 and the salt spray storage tank 805 are sprayed onto the test piece in the cavity of the test chamber 10, so as to test the influence of different media on the material performance.

[0060] Moreover, through the gas source media in the air compressor 801 and the air storage tank 802, after being dried by the dryer 11, they are sprayed into the test chamber 10, so as to facilitate the performance test of the material on the gas.

[0061] During the test, a heating coil 821 can be installed. The heating coil 821 is controlled by the power supply component 822 to heat the material in the test chamber 10, so as to test the influence of different temperatures on the material. When it is necessary to conduct a high-temperature test on the material in a vacuum or high-pressure state, while heating through the heating coil 821, the air in the test chamber 10 is evacuated or filled through the operation of the negative pressure pump 811 or the positive pressure pump 812, so as to adjust the air pressure in the test chamber 10.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or make equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. An ultra-high cycle fatigue performance test device, characterized in that Comprising: A test chamber (10) having a cavity for placing a test piece; At least two environmental simulation devices (80), each of the environmental simulation devices (80) including a cover plate (800) detachably connected to the test chamber (10) and an environmental simulator connected to the cover plate (800), the cover plate (800) having a communication hole fluidly communicating with the cavity, and the environmental simulator being fluidly communicated with the communication hole to input a simulation medium in the environmental simulator into the cavity; Wherein, at least one of the at least two environmental simulation devices (80) is selectively connected to the test chamber (10) through its own cover plate (800).

2. The ultra-high cycle fatigue performance test device according to claim 1, wherein, The environmental simulator includes a first environmental simulator, the first environmental simulator including an air storage tank (802), an erosion liquid storage tank (804), a salt spray storage tank (805) and a switching device, the air storage tank (802) being configured to convey air to the cavity of the test chamber (10), the erosion liquid storage tank (804) being configured to convey erosion liquid to the cavity of the test chamber (10), the salt spray storage tank (805) being configured to convey salt spray to the cavity of the test chamber (10), and the switching device being configured to control at least one of the air storage tank (802), the erosion liquid storage tank (804) and the salt spray storage tank (805) to be fluidly communicated with the test chamber (10).

3. The ultra-high cycle fatigue performance test device according to claim 2, characterized in that, The first environmental simulator further includes an air compressor (801) connected to the air storage tank (802), the air compressor (801) being configured to compress the air in the air storage tank (802) to increase the pressure.

4. The ultra-high cycle fatigue performance test device according to claim 2, characterized in that, The first environmental simulator further includes a dryer (803) disposed between the air storage tank (802) and the cavity, the dryer (803) being configured to dry the air output from the air storage tank (802).

5. The ultra-high cycle fatigue performance test device according to claim 1, characterized in that, The environmental simulator (80) includes a second environmental simulator, the second environmental simulator including a negative pressure pump (811) and a positive pressure pump (812), the negative pressure pump (811) being configured to create a negative pressure environment in the cavity, and the positive pressure pump (812) being configured to create a positive pressure environment in the cavity.

6. The ultra-high cycle fatigue performance test device according to claim 5, wherein, The second environmental simulator further includes a medium storage tank (813), the medium storage tank (813) being connected to the positive pressure pump (812).

7. The ultra-high cycle fatigue performance test device according to claim 1, characterized in that, The environmental simulator includes a third environmental simulator, the third environmental simulator including a heating coil (821) and a power supply element (822), wherein, the heating coil (821) is disposed inside the cover plate (800) to heat the cavity, and the heating coil (821) is configured as an annular structure to surround the outside of the test piece.

8. The ultra-high cycle fatigue performance test device according to any one of claims 1 to 7, characterized in that, The ultra-high cycle fatigue performance test device further includes a displacement amplifier (30), the displacement amplifier (30) is disposed through the wall thickness direction of the test cavity (10), and the first end of the displacement amplifier (30) penetrates into the cavity and is connected to a test piece, and the second end of the displacement amplifier (30) penetrates out of the outside of the cavity.

9. The ultra-high cycle fatigue performance test device according to claim 8, characterized in that, The ultra-high cycle fatigue performance test device further includes a signal transmitter (50) and a computer (60), the signal transmitter (50) is electrically connected to the displacement amplifier (30) for sending the displacement signal of the displacement amplifier (30) to the computer (60).

10. The ultra-high cycle fatigue performance test device according to any one of claims 1 to 7, characterized in that, The ultra-high cycle fatigue performance test device further includes a discharge pipe (40) connected to the bottom end of the test cavity (10), and the discharge pipe (40) is used to discharge the simulated medium after the test is completed.

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