Self-adaptive pressure relief anti-spalling carbon dioxide stratum freezing test box

Abstract

The invention discloses a self-adaptive pressure relief anti-spalling carbon dioxide stratum freezing test box which comprises a test bed, a box body, a self-adaptive pressure relief mechanism, a hoisting type angle adjusting mechanism and a control system, the first end of the box body is supported and hinged to the test bed, and the second end of the box body is connected with the hoisting type angle adjusting mechanism; the hoisting type angle adjusting mechanism can drive the second end of the box body to move so as to drive the box body to rotate, the self-adaptive pressure relief mechanism is arranged on an inlet and an outlet of the box body, a first pressure threshold safety valve and a second pressure threshold safety valve are formed, a soil type-safety valve linkage unit is arranged in the control system, and the control system can control the soil type-safety valve based on the soil type. The working states of the first pressure threshold value safety valve and the second pressure threshold value safety valve are matched and controlled through the soil type-safety valve linkage unit so as to adapt to freezing expansion pressure of different kinds of soil, the working state of the hoisting type angle adjusting mechanism can be controlled, and stability and reliability are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stratum freezing test, in particular to a self-adaptive pressure relief anti-expansion carbon dioxide stratum freezing test box BACKGROUND

[0002] In the carbon dioxide freezing soil test, the test box needs to cope with the significant difference of freezing expansion pressure of different types of soil for a long time, for example, the peak value of freezing expansion pressure of sandy soil and silt is only 1-2MPa, while that of clayey soil and saturated clay can reach 3-4MPa, and it also needs to cope with the long-term low temperature and angle adjustment requirements. The existing test box usually adopts a single mechanical safety valve with a fixed threshold, for example, the fixed threshold is 2MPa, which cannot bear the high pressure of clayey soil, causing the box to be easy to expand and crack, and also causing the sandy soil to be relieved of pressure too early, resulting in waste of cold energy and reduction of freezing efficiency. At the same time, the existing test box adopts a support type angle adjustment device, which has low adjustment efficiency. During the test, the soil causes the box to move slightly due to freezing shrinkage or expansion, which destroys the initial density state and affects the reliability of the test data.

[0003] Therefore, it has become a problem to be solved in the field to provide a stable and reliable freezing test box that can cope with the freezing expansion pressure of different types of soil and angle adjustment. SUMMARY

[0004] In view of the defects of the prior art, the purpose of the present application is to provide a self-adaptive pressure relief anti-expansion carbon dioxide stratum freezing test box that can adapt to the freezing expansion pressure of different types of soil and angle adjustment, and is stable and reliable.

[0005] In order to achieve the above-mentioned purpose, the self-adaptive pressure relief anti-expansion carbon dioxide stratum freezing test box provided by the present application comprises a test table, a box, a self-adaptive pressure relief mechanism, a hoisting type angle adjustment mechanism and a control system, The first end of the box is supported and hinged on the test table, and the second end is connected to the hoisting type angle adjustment mechanism. The hoisting type angle adjustment mechanism can drive the second end of the box to move to drive the box to rotate. The self-adaptive pressure relief mechanism is arranged on the inlet and outlet of the box and is formed with a first pressure threshold safety valve and a second pressure threshold safety valve. The control system is configured with a soil type-safety valve linkage unit. The control system can match and control the working state of the first pressure threshold safety valve and the second pressure threshold safety valve through the soil type-safety valve linkage unit based on the soil type, and can also control the working state of the hoisting type angle adjustment mechanism.

[0006] Further, the test table comprises a bottom plate, columns and a rotating shaft. The columns are distributed on both sides of the bottom plate, and the rotating shaft is arranged at the upper region of the columns at both ends. The box is hinged with the rotating shaft.

[0007] Further, the inner wall of the box is provided with a variable wall thickness module, which can adjust the wall thickness of the box based on the soil type-safety valve linkage unit.

[0008] Further, the box is provided with a data acquisition module, which can detect the internal pressure of the box in real time, and control the working state of the first pressure threshold safety valve and the second pressure threshold safety valve in combination with the soil type-safety valve linkage unit.

[0009] Further, the hoisting type angle adjusting mechanism includes a hoisting fulcrum, a hoisting rope and a driving device, the hoisting fulcrum is arranged on both sides of the second end respectively, one end of the hoisting rope is connected with the driving device, and the other end is formed with a first hoisting rope and a second hoisting rope, and the first hoisting rope and the second hoisting rope are connected with the hoisting fulcrum respectively.

[0010] Further, the inner wall of the box is provided with a corrosion-resistant layer.

[0011] Further, the outer wall of the box is provided with a heat preservation layer.

[0012] The adaptive pressure relief anti-cracking carbon dioxide stratum freezing test box provided by the present application can control the working of the first pressure threshold safety valve or the second pressure threshold safety valve according to the soil type, so as to adapt to the freezing expansion pressure of different soils, further, the hoisting type angle adjusting mechanism adjusts the angle of the box at the same time, so as to adapt to the angle required by the freezing test of different soils, and ensure the stability of the box, which is not affected by the freezing shrinkage or expansion of the soil, so as to ensure the stability and reliability of the test box. BRIEF DESCRIPTION OF DRAWINGS

[0013] The present application will be further described below in combination with the drawings and specific embodiments.

[0014] Figure 1 And Figure 2 The overall structure schematic diagram of the adaptive pressure relief anti-cracking carbon dioxide stratum freezing test box provided by the present application is shown in the figure. Figure 3 The structure schematic diagram of the box in the present application is shown in the figure. Figure 4 The cooperation system block diagram of the control system and the adaptive pressure relief mechanism in the present application is shown in the figure. Figure 5 The schematic diagram of the soil type control module in the present application is shown in the figure.

[0015] Reference signs: 1. test bench; 11. bottom plate; 12. stand column; 13. rotating shaft; 14. mounting frame; 2. box; 21. first end; 22. second end; 23. mounting groove; 24. variable wall thickness module; 25. anticorrosive layer; 26. thermal insulation layer; 27. data acquisition module; 3. self-adaptive pressure relief mechanism; 31. first pressure threshold safety valve; 32. second pressure threshold safety valve; 4. hoisting type angle adjusting mechanism; 41. hoisting fulcrum; 411. first lifting lug; 412. second lifting lug; 42. horizontal support beam; 43. hoisting rope; 431. first hoisting rope; 423. second hoisting rope; 44. driving device; 5. control system; 51. soil type-safety valve linkage unit; 511. first soil type control module; 512. second soil type control module. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in combination with specific drawings.

[0017] Referring to Figure 1 and Figure 2 , which shows an example of the self-adaptive pressure relief anti-cracking carbon dioxide stratum freezing test box provided by the present application.

[0018] The self-adaptive pressure relief anti-cracking carbon dioxide stratum freezing test box of the present example mainly comprises a test bench 1, a box 2, a self-adaptive pressure relief mechanism 3, a hoisting type angle adjusting mechanism 4 and a control system 5.

[0019] The first end 21 of the box 2 is supported and hinged on the test bench 1, and the second end 22 is connected to the hoisting type angle adjusting mechanism 4, which can drive the second end 22 of the box 2 to move to drive the box to rotate. The self-adaptive pressure relief mechanism 3 is arranged on the inlet and outlet of the box 1 and is formed with a first pressure threshold safety valve 31 and a second pressure threshold safety valve 32. The control system 5 is configured with soil type-safety valve linkage units corresponding to the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32, respectively. The control system 5 can control the working states of the first pressure threshold safety valve 31, the second pressure threshold safety valve 32 and the hoisting type angle adjusting mechanism 4 based on the soil type-safety valve linkage units, adapt to the freezing expansion pressure and angle adjustment of different soils, and improve the stability and reliability of the test box.

[0020] In combination with Figure 1 and Figure 2Wherein, the test bench 1 comprises a base plate 11, a stand column 12 and a rotating shaft 13, the stand column 12 and the rotating shaft 13 are distributed in a first end region of the base plate 11, corresponding to the first end 21 of the box 2, used to support the box 2, the stand column 12 is distributed on both sides of the base plate 11, and the rotating shaft 13 is configured as a cylindrical beam, and both ends are arranged in the upper region of the stand column 12 on both sides.

[0021] Correspondingly, the bottom of the first end 21 region of the box 2 is provided with a mounting groove 23 matched with the rotating shaft 13, the rotating shaft 12 can be embedded in the mounting groove 23 and connected with the mounting groove 23 in sliding mode, so that the box 2 is supported and hinged on the rotating shaft 13, and can rotate around the rotating shaft 13 to realize the angle adjustment of the box 2.

[0022] In combination Figure 3 Further, the inner wall of the box 2 is provided with a variable wall thickness module 24, which can adjust the wall thickness of the box 2 based on the soil type, in this example, the variable wall thickness module 24 is composed of a reinforcing plate detachably connected to the side wall of the box 2, to realize the wall thickness adjustment of the box 2.

[0023] As an example, the box 2 is composed of 12mm thick Q345R steel (anti-expansion pressure 3MPa) to meet the freezing expansion pressure of sandy soil and silt, when the soil type is high pressure soil such as clay, 5mm thick 16MnDR reinforcing plate is installed on the side wall of the box, so that the local wall thickness of the box 2 is increased to 17mm, and the anti-expansion pressure is increased to 4MPa, avoiding the box 2 being cracked by high pressure, so as to adapt to the freezing expansion pressure of different soil types and ensure the stability and reliability of the box 2.

[0024] Preferably, the box 2 is configured in a rectangular structure with rounded corners, which can effectively avoid stress concentration and prevent the box 2 from being cracked by soil freezing expansion pressure.

[0025] In combination Figure 3 Further, the inner wall of the box 2 is provided with a corrosion-resistant layer 25, as an example, the corrosion-resistant layer 25 can be composed of 0.5mm thick SPUA-202 type polyurea corrosion-resistant layer, to ensure that the low temperature resistance of the corrosion-resistant layer 25 reaches-60℃, the salt spray resistance is ≥2000h, which can effectively isolate the erosion of soil moisture and CO2 to the box 2, and the annual corrosion rate is ≤0.05mm, thereby improving the service life of the box 2.

[0026] In addition, the outer wall of the box 2 is also provided with a heat preservation layer 26, as an example, the heat preservation layer 26 can be composed of a 60mm thick vacuum insulation board (VIP board), the core material of the vacuum insulation board is composed of nano silicon dioxide, and the outer shell is composed of aluminum plastic composite film, so that the thermal conductivity of the heat preservation layer 26 is ≤0.008W / (m·K), which is much lower than the thermal conductivity of the traditional rock wool heat preservation layer of the box (≥0.045W / (m·K)), and at the same time, the internal temperature fluctuation of the box 2 is ≤±0.5K, so as to ensure the stability of the heat transfer test data.

[0027] In combination Figure 1 In order to adapt to the pressure relief requirements of different types of soil in the box 2 and ensure the stability and reliability of the box 2, a self-adaptive pressure relief mechanism 3 is arranged on the inlet and outlet of the box 2, the self-adaptive pressure relief mechanism 3 is formed with a first pressure threshold safety valve 31 and a second pressure threshold safety valve 32, and can cooperate with the control system 5 to adjust the working state of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 based on the soil type, so as to adapt to different soil types and open the pressure relief state of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32.

[0028] Specifically, the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 are arranged side by side on the inlet and outlet of the box 2, the pressure threshold of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 is different, and is adapted to the freezing expansion pressure peak value of different soil types.

[0029] As an example, the pressure threshold of the first pressure threshold safety valve 31 is adapted to the freezing expansion pressure of low-pressure soil such as sandy soil and silt, in this example, the pressure threshold of the first pressure threshold safety valve 31 is configured to be 1-2MPa, so that the opening pressure of the first pressure threshold safety valve 31 is 2MPa and the closing pressure is 1MPa, so as to adapt to the freezing expansion pressure peak value 1-2MPa of low-pressure soil such as sandy soil and silt.

[0030] During the test, when the low-pressure soil such as sandy soil and silt freezes, the freezing expansion pressure peak value will be stabilized at 1-2MPa, and the pressure will rise slowly (for example, from 0MPa to 2MPa within 1 hour).

[0031] In this way, when the low-pressure soil such as sandy soil and silt in the box 2 reaches the upper limit of the freezing expansion pressure, the pressure of the box 2 rises to 2MPa, reaches the opening pressure of the first pressure threshold safety valve 31, and the first pressure threshold safety valve 31 will be opened, gradually discharging a small amount of CO2 through the pressure relief hole, avoiding continuous pressure of the box 2 caused by the pressure, and avoiding slight deformation of the box 2.

[0032] Further, when the frozen expansion pressure of the low-pressure soil such as sandy soil and silt in the box 2 drops to 1 MPa, the pressure in the box 2 reaches a safe and cold-keeping balance point, and at the same time reaches the closing pressure of the first pressure threshold safety valve 31, the first pressure threshold safety valve 31 will be immediately closed to prevent excessive loss of CO2 cold caused by continuous pressure relief, so as to ensure stable and reliable test.

[0033] Similarly, the pressure threshold of the second pressure threshold safety valve 32 is matched with the frozen expansion pressure of the high-pressure soil such as clay and saturated clay, and in the present example, the pressure threshold of the second pressure threshold safety valve 32 is configured to be 3-4 MPa, so that the opening pressure of the second pressure threshold safety valve 32 is 3 MPa and the closing pressure is 4 MPa, so as to adapt to the frozen expansion pressure peak of 3-4 MPa of the high-pressure soil such as clay and saturated clay.

[0034] During the test, due to the high water content of the high-pressure soil such as clay and saturated clay, the soil particles adsorb a large amount of water, and the volume expansion rate reaches 9%-12%, which causes the frozen expansion pressure of the high-pressure soil such as clay and saturated clay to rise rapidly (for example, from 0 MPa to 4 MPa in 10-15 minutes).

[0035] Therefore, for the high-pressure soil such as clay and saturated clay, the wall thickness of the box 2 is strengthened by the variable wall thickness module 24.

[0036] In this way, when the high-pressure soil such as clay and saturated clay in the box 2 reaches the upper limit of the frozen expansion pressure, the pressure in the box 2 rises to 4 MPa, reaching the opening pressure of the second pressure threshold safety valve 32, and the second pressure threshold safety valve 32 will be quickly opened to quickly release the pressure, preventing the pressure in the box 2 from breaking through the anti-expansion limit of the variable wall thickness module 24 and causing the box 2 to crack.

[0037] Further, when the frozen expansion pressure of the high-pressure soil such as clay and saturated clay in the box 2 drops to 3 MPa, the pressure in the box 2 reaches the effective balance point of the high-pressure interval, and at the same time reaches the closing pressure of the second pressure threshold safety valve 32, the second pressure threshold safety valve 32 will be immediately closed to prevent excessive loss of CO2 cold caused by continuous pressure relief, so as to ensure stable and reliable test.

[0038] Here, the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 are conventional technical means in the art, which can be composed of existing safety valves, and will not be described here.

[0039] Therefore, the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 respectively adapt to different types of soil and can release pressure based on the frozen expansion pressure of the corresponding soil type.

[0040] In order to control the working state of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32, it is ensured that the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 only work when there is a corresponding soil type in the box 2, so as to realize the time-sharing work and self-adaptive pressure relief of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32. The box 2 is provided with a data acquisition module 27, which can cooperate with the control system 5 to control the time-sharing work of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 in combination with the soil type in the box 2.

[0041] In combination Figure 4 And Figure 5 Specifically, the control system 5 is provided with a soil type-safety valve linkage unit 51, which includes a first soil type control module 511 and a second soil type control module 512. The soil type-safety valve linkage unit 51 can receive external soil type signals and configure the soil type signals to correspond to the soil type, water content range, frozen expansion pressure peak value, activated safety valve and closed safety valve of the first soil type control module 511 and the second soil type control module 512 respectively.

[0042] In combination Figure 4 For the first soil type control module 511, the soil type is low-pressure soil such as sandy soil and silt, the water content range is 15%-25%, the frozen expansion pressure peak value is 1-2MPa, the activated safety valve corresponds to the first pressure threshold safety valve 31, and the closed safety valve corresponds to the second pressure threshold safety valve 32.

[0043] For the second soil type control module 512, the soil type is high-pressure soil such as clay and saturated clay, the water content range is 25%-35%, the frozen expansion pressure peak value is 3-4MPa, the activated safety valve corresponds to the second pressure threshold safety valve 32, and the closed safety valve corresponds to the first pressure threshold safety valve 31.

[0044] In this way, the soil type-safety valve linkage unit 51 can mobilize the first soil type control module 511 or the second soil type control module 512 to work according to the external soil type signal, so that the first soil type control module 511 or the second soil type control module 512 can respectively send the first activation signal and the second activation signal according to the corresponding soil type.

[0045] As an example, when the soil in the box 2 is sandy soil, silt soil and other low-pressure soil, the test personnel can input the soil type signal to the soil type-safety valve linkage unit 51 through the control system 5 to determine that the soil type is sandy soil, silt soil and other low-pressure soil, so as to mobilize the first soil type control module 511, so that the first soil type control module 511 matches the activated safety valve to the first pressure threshold safety valve 31, and issues the first activation signal corresponding to the first pressure threshold safety valve 31.

[0046] Correspondingly, when the soil in the box 2 is clay soil, saturated clay and other high-pressure soil, the test personnel can input the soil type signal to the soil type-safety valve linkage unit 51 through the control system 5 to determine that the soil type is clay soil, saturated clay and other high-pressure soil, so as to mobilize the second soil type control module 512, so that the second soil type control module 512 matches the activated safety valve to the second pressure threshold safety valve 32, and issues the second activation signal corresponding to the second pressure threshold safety valve 32.

[0047] Therefore, the control system 5 can match and issue the first activation signal or the second activation signal corresponding to the first pressure threshold safety valve 31 or the second pressure threshold safety valve 32 respectively based on the soil type.

[0048] In combination Figure 4 In combination, the data acquisition module 27 in the box 2 can receive the first activation signal or the second activation signal issued by the first soil type control module 511 or the second soil type control module 512, and detect the internal pressure of the box 2 in real time. When the internal pressure reaches the pressure threshold of the first pressure threshold safety valve 31 or the second pressure threshold safety valve 32, the first pressure threshold safety valve 31 or the second pressure threshold safety valve 32 is controlled according to the first activation signal or the second activation signal, so as to realize the time-sharing work of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32.

[0049] As an example, when the first soil type control module 511 issues the first activation signal, the data acquisition module 27 receives the first activation signal in real time to correspondingly control the working state of the first pressure threshold safety valve 31. At the same time, the data acquisition module 27 detects the internal pressure of the box 2 in real time. When the internal pressure reaches the pressure threshold of the first pressure threshold safety valve 31, the data acquisition module 27 opens the first pressure threshold safety valve 31 to realize the pressure relief of the sandy soil, silt soil and other low-pressure soil, while keeping the second pressure threshold safety valve 32 closed to prevent the second pressure threshold safety valve 32 from affecting the pressure relief.

[0050] Correspondingly, when the second soil type control module 512 sends out a second activation signal, the data acquisition module 27 receives the second activation signal in real time to correspondingly control the working state of the second pressure threshold safety valve 32, and at the same time, the data acquisition module 27 detects the internal pressure of the box body 2 in real time. When the internal pressure reaches the pressure threshold of the second pressure threshold safety valve 32, the data acquisition module 27 opens the second pressure threshold safety valve 32 to realize pressure relief for high-pressure soil such as clay and saturated clay, while keeping the first pressure threshold safety valve 31 closed to prevent the first pressure threshold safety valve 31 from affecting pressure relief.

[0051] Here, the data acquisition module 27 can be composed of an existing pressure sensor, which is not described here.

[0052] The soil type-safety valve linkage unit 51 and the data acquisition module 27 thus formed can cooperate with each other, match and correspondingly control the time-sharing work of the first pressure threshold safety valve 31 and the second pressure threshold safety valve 32 based on the soil type, to realize adaptive pressure relief corresponding to different soil types.

[0053] Further, the test box also includes a hoisting type angle adjusting mechanism 4, which can move the second end 22 of the box body 2 to adjust the angle of the box body 2. The control system 5 can adjust the working state of the hoisting type angle adjusting mechanism 4 to ensure that the box body 2 remains stable and is not affected by soil freezing shrinkage or expansion, thereby ensuring the stability and reliability of the test box.

[0054] In combination with Figure 1 and Figure 2 , specifically, the second side area of the test bench 1 base 11 is provided with a mounting rack 14 for mounting the hoisting type angle adjusting mechanism 4, so that the hoisting type angle adjusting mechanism 4 is arranged on the mounting rack 14 and connected with the second end 22 of the box body 2.

[0055] Further, the hoisting type angle adjusting mechanism 4 includes hoisting fulcrums 41, horizontal support beams 42, hoisting ropes 43, and driving devices 44. The hoisting fulcrums 41 are respectively arranged on both sides of the second end 22 of the box body 2. As an example, the hoisting fulcrums 41 include first and second lifting lugs 411 and 412 respectively arranged on both sides of the second end 22 of the box body 2. The driving devices 44 are arranged on the mounting rack 14 through the horizontal support beams 42. The hoisting ropes 43 are connected to the driving devices 44 at one end and are divided into first and second hoisting ropes 431 and 432 at the other end, so that the first and second hoisting ropes 431 and 432 are respectively connected to the first and second lifting lugs 411 and 412.

[0056] Thus, the lifting support point 41, the lifting rope 43 and the driving device 44 cooperatively form a lifting path in inverted V-shaped distribution, the driving device 44 is preferably composed of a winch, and the lifting rope 43 can be reeled in or out through the driving device 44, so as to synchronously adjust the lengths of the first lifting rope 431 and the second lifting rope 432, thereby synchronously driving the second end 2 of the box body 2 to move vertically through the first lifting rope 431 and the second lifting rope 432, so as to drive the box body 2 to rotate around the rotation shaft 13, and thereby adjust the angle of the box body 2.

[0057] Therefore, through the reeling in or out of the lifting rope 43 by the driving device 44, the angle of the box body 2 can be adjusted to adapt to the required angle for the freezing test of different soil types, the working state of the driving device 44 is controlled by the control system 5, and the angle of the box body 2 can be finely adjusted, so as to prevent the box body 2 from being affected by the freezing shrinkage or expansion of the soil to generate micro-motion.

[0058] The lifting type angle adjusting mechanism 4 thus formed can adjust the angle of the box body 2, while ensuring the stability of the box body 2, which is not affected by the freezing shrinkage or expansion of the soil, thereby ensuring the stability and reliability of the experimental box.

[0059] The adaptive pressure relief anti-cracking carbon dioxide stratum freezing test box provided by the present application can control the first pressure threshold safety valve 31 or the second pressure threshold safety valve 32 to work according to the soil type through the control system 5, so as to adapt to the freezing expansion pressure of different soils, further, the lifting type angle adjusting mechanism 4 adjusts the angle of the box body to adapt to the required angle for the freezing test of different soils, and ensures the stability of the box body, which is not affected by the freezing shrinkage or expansion of the soil, thereby ensuring the stability and reliability of the experimental box.

[0060] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An adaptive pressure relief anti-expansion carbon dioxide formation freezing test chamber, characterized in that, Includes a test bench, enclosure, adaptive pressure relief mechanism, hoisting angle adjustment mechanism, and control system. The first end of the housing is supported and hinged to the test bench, and the second end is connected to the hoisting angle adjustment mechanism. The hoisting angle adjustment mechanism can drive the second end of the housing to move, thereby driving the housing to rotate. The adaptive pressure relief mechanism is set on the inlet and outlet of the housing and forms a first pressure threshold safety valve and a second pressure threshold safety valve. The control system is equipped with a soil type-safety valve linkage unit. The control system can match and control the working state of the first pressure threshold safety valve and the second pressure threshold safety valve based on the soil type through the soil type-safety valve linkage unit, and can also control the working state of the hoisting angle adjustment mechanism.

2. The adaptive pressure relief anti-expansion carbon dioxide formation freezing test chamber according to claim 1, characterized in that, The test bench includes a base plate, columns, and a rotating shaft. The columns are distributed on both sides of the base plate, and the two ends of the rotating shaft are respectively located in the upper area of ​​the columns. The housing is hinged to the rotating shaft.

3. The adaptive pressure relief anti-expansion carbon dioxide formation freezing test chamber according to claim 1, characterized in that, The inner wall of the box is equipped with a variable wall thickness module, which can adjust the wall thickness of the box based on the soil type-safety valve linkage unit.

4. The adaptive pressure relief anti-expansion carbon dioxide formation freezing test chamber according to claim 1, characterized in that, The chamber is equipped with a data acquisition module, which can detect the internal pressure of the chamber in real time and control the working status of the first pressure threshold safety valve and the second pressure threshold safety valve in conjunction with the soil type-safety valve linkage unit.

5. The adaptive pressure relief anti-cracking carbon dioxide formation freezing test chamber according to claim 1, characterized in that, The hoisting angle adjustment mechanism includes a hoisting fulcrum, a hoisting rope, and a driving device. The hoisting fulcrum is respectively located on both sides of the second end. One end of the hoisting rope is connected to the driving device, and the other end forms a first hoisting rope and a second hoisting rope. The first hoisting rope and the second hoisting rope are respectively connected to the hoisting fulcrum.

6. The adaptive pressure relief anti-cracking carbon dioxide formation freezing test chamber according to claim 1, characterized in that, The inner wall of the box is equipped with an anti-corrosion layer.

7. The adaptive pressure relief anti-expansion carbon dioxide formation freezing test chamber according to claim 1, characterized in that, The outer wall of the box is equipped with a heat insulation layer.

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