A frozen soil layer coring device, a coring system and a coring method

Abstract

This invention relates to the field of permafrost coring technology, and particularly to a permafrost coring device, coring system, and coring method. The device includes: a support and fixing module, a coring module, a protective chamber, a monitoring module, a compensation module, and a control module. The coring module includes a coring ejector, a coring chamber, and a drill bit assembly. A door is provided at the bottom of the protective chamber. The monitoring module is used to detect the temperature and pressure of the coring chamber and the protective chamber. The compensation module is connected to an external compensator and is used to compensate for the temperature and pressure of the coring chamber and the protective chamber based on the detection results of the monitoring module. The control module is used to control the working status of the coring ejector, the drill bit assembly, the door, the monitoring module, and the compensation module according to instructions from a control terminal, so as to maintain the in-situ temperature and pressure of the coring chamber and the protective chamber during the process of moving to the target location in the permafrost, ejecting the coring sample, and completing the coring process.

Description

Technical Field

[0001] This invention relates to the field of frozen soil coring technology, and particularly to a frozen soil coring device, coring system and coring method. Background Technology

[0002] Permafrost, formed under the background of geological history and climate evolution, is the result of the combined effects of geological structure, hydrology, surface features, and geographical environment. It exhibits unique evolutionary patterns and is sensitive to climate change and human activities, thus being considered an indicator of climate change. Currently, researchers both domestically and internationally are focusing on the vertical evolution of permafrost, the porosity distribution of permafrost, and the use of permafrost to prepare for the restoration of vertical climate and environmental changes. These areas urgently require solutions through continuous core sampling of permafrost.

[0003] Because permafrost samples are easily affected by changes in temperature and pressure, the heat preservation and pressure maintenance functions of permafrost coring devices are particularly important. However, existing permafrost coring devices mainly use ball valves for pressure maintenance and thermal insulation materials for heat preservation. This results in poor pressure and heat preservation effects, making it difficult to maintain the in-situ pressure and temperature of the permafrost layer.

[0004] Therefore, there is an urgent need for a new permafrost coring device. Summary of the Invention

[0005] To address the issues of poor pressure retention and heat preservation in existing permafrost coring devices, this invention provides a permafrost coring device, coring system, and coring method.

[0006] In a first aspect, embodiments of the present invention provide a permafrost coring device, comprising: a support and fixing module, a coring module, a protective chamber, a monitoring module, a compensation module, and a control module;

[0007] The support and fixing module includes a support frame and a housing. The support frame is used to fix the core sampling module, the protective chamber, the monitoring module, the compensation module, and the control module. The housing is disposed on the outside and is used to protect the core sampling module, the protective chamber, the monitoring module, the compensation module, and the control module.

[0008] The core sampling module includes a core ejector, a core chamber, and a drill bit assembly. The core ejector is fixed to the bottom end of the support frame, the core chamber is fixed to the bottom end of the core ejector, and the drill bit assembly is disposed at the bottom end of the core chamber. The core ejector is used to eject the core chamber so that the drill bit assembly can be used to extract cores from the frozen soil layer.

[0009] The protective chamber is fixed to the lower end of the support frame and surrounds the core module. A switch door is provided at the bottom of the protective chamber. The protective chamber is used to protect the core module, and the switch door is used to allow the core chamber and drill bit components to pop out and pop back into the protective chamber.

[0010] The monitoring module is mounted on the support frame and is used to detect the temperature and pressure of the core sampling chamber and the protective chamber.

[0011] The compensation module is mounted on the support frame and connected to an external compensator. The compensation module is used to compensate for the temperature and pressure of the core sampling chamber and the protective chamber based on the detection results of the monitoring module.

[0012] The control module is mounted on the support frame and is electrically connected to the core ejector, the drill bit assembly, the switch door, the monitoring module, the compensation module, and an external control terminal. The control module is used to control the working status of the core ejector, the drill bit assembly, the switch door, the monitoring module, and the compensation module according to the instructions of the control terminal, so as to maintain the temperature and pressure of the core chamber and the protective chamber at the in-situ temperature and pressure of the frozen soil layer during the process of moving to the target position in the frozen soil layer, ejecting the core, and completing the core extraction.

[0013] Secondly, embodiments of the present invention also provide a permafrost coring system, including a control terminal, a compensator, and a permafrost coring device as described in any embodiment of this specification;

[0014] The control terminal is electrically connected to the permafrost coring device and is used to send instructions to the permafrost coring device.

[0015] The compensator is connected to the frozen soil coring device and is used to compensate for the temperature and pressure of the frozen soil coring device.

[0016] Thirdly, embodiments of the present invention also provide a method for coring frozen soil layers based on the apparatus described in any embodiment of this specification, comprising:

[0017] Obtain in-situ temperature and in-situ pressure of the frozen soil layer;

[0018] The control and monitoring module monitors the temperature and pressure of the protective chamber and the core sampling chamber in real time, and controls the compensation module to compensate the temperature and pressure of the protective chamber and the core sampling chamber based on the monitoring results, in-situ temperature and in-situ pressure, so that the temperature and pressure of the protective chamber and the core sampling chamber are equal to the in-situ temperature and in-situ pressure.

[0019] When the target location in the permafrost layer is reached, and the temperature and pressure of the protective chamber and the core sampling chamber are equal to the in-situ temperature and pressure, the control module is used to open the door of the protective chamber, so as to control the core ejector to eject the core sampling chamber and the drill bit component for core sampling.

[0020] After the core sampling chamber springs back into the protective chamber, the control door is closed, and the monitoring module and the compensation module are used to maintain the original temperature and pressure of the protective chamber and the core sampling chamber.

[0021] This invention provides a coring device, coring system, and coring method for permafrost. The device includes: a support and fixing module, a coring module, a protective chamber, a monitoring module, a compensation module, and a control module. The coring module includes a coring ejector, a coring chamber, and a drill bit assembly. A door is provided at the bottom of the protective chamber. The monitoring module detects the temperature and pressure of the coring chamber and the protective chamber. The compensation module is connected to an external compensator and compensates for the temperature and pressure of the coring chamber and the protective chamber based on the monitoring module's detection results. The control module controls the working states of the coring ejector, the drill bit assembly, the door, the monitoring module, and the compensation module according to instructions from a control terminal. This ensures that during the process of moving to the target location in the permafrost, ejecting the coring sample, and completing the coring process, the temperature and pressure of the coring chamber and the protective chamber are maintained at the in-situ temperature and pressure of the permafrost. This solution enables automatic coring of permafrost and maintains the in-situ temperature and pressure of the cored sample within the permafrost layer, thus preventing changes in the sample's structure and physical properties. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a permafrost coring device according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of a door opening and closing structure provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of a drill bit component provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of a permafrost coring system according to an embodiment of the present invention;

[0027] Figure 5This is a flowchart of a method for coring permafrost layers according to an embodiment of the present invention.

[0028] Figure label:

[0029] 80. Control terminal; 90. Compensator; 1. Protective chamber; 2. Support frame; 3. Housing; 4. Core ejector; 5. Core chamber; 6. Drill bit assembly; 601. Electric joint; 602. Electrothermal drill bit; 7. Opening and closing door; 701. Electromagnetic relay; 702. Sealing cover; 8. Monitor; 9. First pressure sensor; 10. First temperature sensor; 11. Second pressure sensor; 12. Second temperature sensor; 13. Compensation controller; 14. First compensation pipeline; 15. Second compensation pipeline; 16. Third compensation pipeline; 17. Logic controller; 18. Signal receiver; 19. Power supply assembly. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] As mentioned earlier, existing permafrost coring devices mainly use ball valves for pressure maintenance and thermal insulation materials for heat preservation. This results in poor pressure and heat preservation effects, making it difficult to maintain the in-situ pressure and temperature of the permafrost layer.

[0032] To address the aforementioned technical issues, the inventors propose utilizing a protective chamber with a switchable door at the bottom to further protect the temperature and pressure of the core sampling chamber. A monitoring module can be used to detect the temperature and pressure of both the protective and core sampling chambers. If the detection results do not match the in-situ temperature and pressure of the permafrost layer, a compensation module can be used to compensate for these differences, ensuring that the temperature and pressure of the protective and core sampling chambers remain at their in-situ levels. Furthermore, a control module, core ejector, core sampling chamber, and drill bit components can be used to achieve automatic core sampling from the permafrost layer. Therefore, this solution not only enables automatic core sampling from the permafrost layer but also maintains the in-situ temperature and pressure of the core sample, improving the pressure and temperature preservation effects compared to existing technologies.

[0033] The following describes the specific implementation of the above concept.

[0034] Please combine Figure 1 and Figure 4This invention provides a permafrost coring device, which includes a support and fixing module comprising a support frame 2 and a housing 3. The support frame 2 is used to fix the coring module, the protective chamber 1, the monitoring module, the compensation module, and the control module. The housing 3 is disposed on the outside and is used to protect the coring module, the protective chamber 1, the monitoring module, the compensation module, and the control module.

[0035] The core sampling module includes a core ejector 4, a core chamber 5, and a drill bit assembly 6. The core ejector 4 is fixed to the bottom end of the support frame 2, the core chamber 5 is fixed to the bottom end of the core ejector 4, and the drill bit assembly 6 is located at the bottom end of the core chamber 5. The core ejector 4 is used to eject the core chamber 5 so that the drill bit assembly 6 can be used to extract cores from the frozen soil layer.

[0036] The protective chamber 1 is fixed to the lower end of the support frame 2 and surrounds the outside of the core module. The bottom end of the protective chamber 1 is provided with a switch door 7. The protective chamber 1 is used to protect the core module, and the switch door 7 is used to allow the core chamber 5 and the drill bit component 6 to pop out and pop back into the protective chamber 1.

[0037] The monitoring module is installed on the support frame 2 and is used to detect the temperature and pressure of the core sampling chamber 5 and the protective chamber 1;

[0038] The compensation module is mounted on the support frame 2 and connected to the external compensator 90. The compensation module is used to compensate for the temperature and pressure of the core sampling chamber 5 and the protection chamber 1 based on the detection results of the monitoring module.

[0039] The control module is mounted on the support frame 1 and is electrically connected to the core ejector 4, drill bit assembly 6, switch door 7, monitoring module, compensation module, and external control terminal 80. The control module is used to control the working status of the core ejector 4, drill bit assembly 6, switch door 7, monitoring module, and compensation module according to the instructions of the control terminal 80, so as to maintain the temperature and pressure of the core chamber 5 and the protective chamber 1 in the in-situ temperature and pressure of the frozen soil layer during the process of moving to the target position of the frozen soil layer, ejecting the core, and completing the core extraction.

[0040] In this embodiment of the invention, the device includes a support and fixing module, a core sampling module, a protective chamber 1, a monitoring module, a compensation module, and a control module. The core sampling module includes a core ejector 4, a core sampling chamber 5, and a drill bit assembly 6. A switch door 7 is provided at the bottom of the protective chamber 1. The monitoring module is used to detect the temperature and pressure of the core sampling chamber 5 and the protective chamber 1. The compensation module is connected to an external compensator 90 and is used to compensate for the temperature and pressure of the core sampling chamber 5 and the protective chamber 1 based on the detection results of the monitoring module. The control module is used to control the working status of the core ejector 4, the drill bit assembly 6, the switch door 7, the monitoring module, and the compensation module according to the instructions of the control terminal 80, so as to maintain the temperature and pressure of the core sampling chamber 5 and the protective chamber 1 at the in-situ temperature and pressure of the frozen soil layer during the process of moving to the target location in the frozen soil layer, ejecting the core sample, and completing the core sampling. This solution can realize automatic core sampling from the frozen soil layer and can maintain the in-situ temperature and pressure of the frozen soil layer to avoid changes in the sample structure and physical properties.

[0041] refer to Figure 2 In some embodiments, the opening and closing door 7 of the protective compartment 1 may include: an electromagnetic relay 701 and a sealing cover 702;

[0042] An electromagnetic relay 701 is located at the bottom of the protective chamber 1, and a sealing cover 702 is located on the electromagnetic relay 701. When the electromagnetic relay 701 is de-energized, the sealing cover 702 opens to allow the core chamber 5 and the drill bit assembly 6 to pop out and bounce back into the protective chamber 1. When the electromagnetic relay 701 is energized, the sealing cover 702 closes to seal the protective chamber 1.

[0043] In this embodiment, during the core retrieval process, the electromagnetic relay 701 is de-energized and the sealing cover 702 is opened, allowing the core retrieval chamber 5 and the drill bit component 6 to pop out for core retrieval. After the core retrieval is completed and the core retrieval chamber 5 and the drill bit component 6 spring back into the protective chamber 1, the electromagnetic relay 701 is energized and the sealing cover 702 is closed, achieving rapid sealing of the protective chamber 1 after core retrieval, thus achieving the purpose of heat preservation and pressure preservation.

[0044] refer to Figure 3 In some embodiments, the drill bit component 6 may include: an electric joint 601 and an electric heating drill bit 602; the number of electric joints 601 and electric heating drill bits 602 is equal.

[0045] An electric joint 601 is located at the bottom of the core chamber 5, and an electric heating drill bit 602 is connected to the bottom of the core chamber 5 via the electric joint 601. When the electric joint 601 is closed, the electric heating drill bit 602 is sealed at the bottom of the core chamber 5. The electric heating drill bit 602 is used to drill and extract cores at the target location in the frozen soil layer after heating.

[0046] In this embodiment, because ice can form in the permafrost layer, using a conventional drill bit for coring would damage the sample and affect the integrity of the cored sample. Therefore, this embodiment uses two electrothermal drill bits 602, each connected to the bottom of the coring chamber 5 via an electric joint 601. When coring is required in the permafrost layer, the electrothermal drill bits 602 heat up, and the electric joints 601 open, allowing the electrothermal drill bits 602 to rotate perpendicularly to the permafrost layer. The control module controls the coring ejector 4 to eject the coring chamber 5. After coring is completed, the control module controls the electrothermal drill bits 602 to stop heating, and the electric joints 601 close, causing the electrothermal drill bits 602 to retract horizontally and be positioned at the bottom of the coring chamber 5, thus sealing the coring chamber 5.

[0047] refer to Figure 1 In some implementations, the monitoring module may include: a monitor 8, a first pressure sensor 9, a first temperature sensor 10, a second pressure sensor 11, and a second temperature sensor 12.

[0048] The first pressure sensor 9 and the first temperature sensor 10 are electrically connected to the monitor 8. The detection heads of the first pressure sensor 9 and the first temperature sensor 10 are set inside the protective chamber 1, and are used to detect the pressure and temperature inside the protective chamber 1 in real time, and transmit the detection results to the monitor 8.

[0049] The second pressure sensor 11 and the second temperature sensor 12 are electrically connected to the monitor 8. The detection heads of the second pressure sensor 11 and the second temperature sensor 12 extend into the core sampling chamber 5 and are used to detect the pressure and temperature in the core sampling chamber 5 in real time, and transmit the detection results to the monitor 8.

[0050] The monitor 8 is fixed on the support frame 2 and is used to send the detection results to the control module.

[0051] In this embodiment, the first pressure sensor 9, the first temperature sensor 10, the second pressure sensor 11, and the second temperature sensor 12 are connected to the monitor 8 via sensor connection lines. The interface is an electronic valve, which enables sensor replaceability.

[0052] Continue to refer to Figure 1 In some implementations, the compensation module may include: a compensation controller 13, a first compensation line 14, a second compensation line 15, and a third compensation line 16;

[0053] The compensation controller 13 is fixed on the support frame 2. The compensation controller 13 is used to control the temperature compensation amount and pressure compensation amount delivered to the second compensation pipeline 15 and the third compensation pipeline 16 respectively according to the detection results of the protection chamber 1 and the core sampling chamber 5 sent by the control module.

[0054] The first compensation line 14 is connected at one end to the compensator 90 and at the other end to the compensation controller 13. The first compensation line 14 is used to connect the compensation controller 13 and the compensator 90.

[0055] The second compensation line 15 is connected at one end to the compensation controller 13 and at the other end to the protective chamber 1. The second compensation line 15 is used to compensate for the pressure and temperature inside the protective chamber 1.

[0056] The third compensation line 16 is connected at one end to the compensation controller 13 and at the other end to the core sampling chamber 5. The third compensation line 16 is used to compensate for the pressure and temperature inside the core sampling chamber 5.

[0057] In this embodiment, the compensator 90 delivers a temperature-regulating gas to the first compensation pipeline 14. This gas has the same composition as the gas in the protective chamber 1 and the core sampling chamber 5. Based on the temperature and pressure detection results of the protective chamber 1 and the core sampling chamber 5 fed back by the monitoring module, and the predetermined in-situ temperature and pressure of the frozen soil layer, the control module determines the temperature compensation amount and pressure compensation amount for the protective chamber 1 and the core sampling chamber 5. This allows the compensation controller 13 to control the amount and temperature of the gas delivered to the second compensation pipeline 15 and the third compensation pipeline 16 based on the temperature and pressure compensation amounts.

[0058] For example, if temperature compensation is required for protection chamber 1, circulating gas at a set temperature is supplied to the second compensation line 15, meaning the pressure of protection chamber 1 will not change. However, if pressure compensation is required for protection chamber 1, a fixed amount of gas is supplied to the second compensation line 15 to change the pressure of protection chamber 1, and the temperature of the supplied gas is the same as the detection temperature of protection chamber 1 at this time, so the temperature of protection chamber 1 will not change.

[0059] In some embodiments, the second pressure sensor 11 and the second temperature sensor 12 are respectively fixed to the bottom ends of the two elastic telescopic tubes, and the elastic telescopic tubes are fixed inside the core extraction chamber 5 so that the second pressure sensor 11 and the second temperature sensor 12 are both inside the core extraction chamber 5 during the pop-out and pop-back process of the core extraction chamber 5.

[0060] The third compensation line 16 is an elastic and expandable tube, so that the third compensation line 16 remains inside the core chamber 5 during the ejection and retraction of the core chamber 5.

[0061] In this embodiment, since the core extraction chamber 5 is ejected entirely during the core extraction process and then bounces back after the core extraction is completed, in order to still detect and compensate for the temperature and pressure of the core extraction chamber 5 during the core extraction process, so that the core extraction chamber 5 maintains its original temperature and pressure during the core extraction process, the second pressure sensor 11 and the second temperature sensor 12 are respectively fixed at the bottom ends of the two elastic telescopic tubes, and the third compensation line 16 is an elastic telescopic tube, which helps to adapt to core extraction of different lengths.

[0062] Continue to refer to Figure 1 In some implementations, the control module includes: a logic controller 17 and a signal receiver 18;

[0063] The signal receiver 18 is electrically connected to the core ejector 4, the drill bit assembly 6 and the switch door 7 respectively. The signal receiver 18 is used to control the working status of the core ejector 4, the drill bit assembly 6 and the switch door 7.

[0064] The logic controller 17 is electrically connected to the control terminal 80, the monitor 8, the compensation controller 13, and the signal receiver 18. The logic controller 17 sends control commands to the monitor 8, the compensation controller 13, and the signal receiver 18 according to the instructions from the control terminal 80. Before reaching the target location in the permafrost layer, it activates the monitoring module and the compensation module to detect the temperature and pressure of the protective chamber 1 and the core sampling chamber 5. When the temperature and pressure of the protective chamber 1 and the core sampling chamber 5 differ from the pre-acquired in-situ temperature and pressure, it calculates the corresponding temperature compensation and pressure compensation based on the detection results of the monitoring module and the in-situ temperature and pressure. The compensation controller 13 compensates for the temperature and pressure of the protective chamber 1 and the core sampling chamber 5 according to the temperature compensation amount and the pressure compensation amount, so as to maintain the original temperature and pressure of the protective chamber 1 and the core sampling chamber 5. When the target position is reached and the protective chamber 1 and the core sampling chamber 5 are at the original temperature and pressure, the switch door 7 of the protective chamber 1 is opened and the core ejector 4 is controlled to eject the core sampling chamber 5 so that the drill bit component 6 at the bottom of the core sampling chamber 5 can start core sampling. After the core sampling chamber 5 completes core sampling and bounces back, the switch door 7 of the protective chamber 1 is closed, and the monitoring module and the compensation module are used to keep the protective chamber 1 and the core sampling chamber 5 at the original temperature and pressure.

[0065] In this embodiment, the signal receiver 18 is connected to the support frame 2 via threads, facilitating replacement. The logic controller 17, monitor 8, and compensation controller 13 are embedded in the support frame 2 using slots, facilitating the replacement of corresponding parts. In this embodiment, the signal receiver 18, logic controller 17, monitor 8, and compensation controller 13 are fixed to the support frame 2. On the one hand, the coring process in the coring chamber 5 will cause vibration of the permafrost coring device. Fixing the signal receiver 18, logic controller 17, monitor 8, and compensation controller 13 to the support frame 2 can ensure less vibration and ensure the stability of the device. On the other hand, during the coring process, the connecting lines can be stably connected, ensuring stable data transmission and facilitating real-time acquisition of temperature and pressure information, achieving the purpose of heat preservation and pressure maintenance coring.

[0066] It should be noted that in practical applications, it is necessary to first drill holes to the designated location, and then obtain the in-situ temperature by measuring the temperature at the target location in the frozen soil layer. The in-situ pressure of the frozen soil layer can be calculated using the following formula:

[0067] P = ρgh

[0068] In the formula, P is the in-situ pressure, ρ is the water density, h is the depth of the target location, and g is the gravitational acceleration.

[0069] The temperature compensation and pressure compensation of the protective chamber 1 and the core sampling chamber 5 can be calculated using the following formulas:

[0070]

[0071] In the formula, P1 is the pressure of the protective chamber 1 or the core sampling chamber 5, T1 is the temperature of the protective chamber 1 or the core sampling chamber 5, P2 is the in-situ pressure, and T2 is the in-situ temperature.

[0072] The derivation process of the compensation calculation formula is explained below.

[0073] According to the following gas law:

[0074] PV = RT

[0075] Since the gas composition in the protective chamber 1 and the core sampling chamber 5 is the same as the gas composition delivered by the compensator 90, it can be determined from the gas state equation that:

[0076]

[0077] In the formula, V1 is the volume of the protective chamber 1 or the core extraction chamber 5.

[0078] Since the volumes of the protective chamber 1 and the core sampling chamber 5 are constant, the formula for calculating the compensation amount can be determined.

[0079] refer to Figure 1 In some embodiments, it may also include: a power supply component 19 disposed on the support frame 2 for supplying power to the core extraction module, the door opening and closing module 7, the monitoring module, the compensation module and the control module.

[0080] like Figure 4 As shown, this embodiment of the invention also provides a permafrost coring system, the system including: a control terminal 80, a compensator 90, and a permafrost coring device as described in any embodiment of this specification;

[0081] The control terminal 80 is electrically connected to the frozen soil coring device and is used to send instructions to the frozen soil coring device.

[0082] The compensator 90 is connected to the frozen soil coring device and is used to compensate for the temperature and pressure of the frozen soil coring device.

[0083] Since the above system is based on the same concept as the device embodiment of the present invention, the specific details can be found in the description of the device embodiment of the present invention, and will not be repeated here.

[0084] like Figure 5 As shown, this embodiment of the invention also provides a method for coring frozen soil layers based on the device described in any embodiment of this specification, the method comprising:

[0085] Step 500: Obtain the in-situ temperature and in-situ pressure of the permafrost layer;

[0086] Step 502: The control monitoring module detects the temperature and pressure of the protection chamber 1 and the core sampling chamber 5 in real time, and controls the compensation module to compensate the temperature and pressure of the protection chamber 1 and the core sampling chamber 5 according to the detection results, in-situ temperature and in-situ pressure, so that the temperature and pressure of the protection chamber 1 and the core sampling chamber 5 are equal to the in-situ temperature and in-situ pressure.

[0087] Step 504: When the target location of the frozen soil layer is reached, and the temperature and pressure of the protective chamber 1 and the core sampling chamber 5 are equal to the in-situ temperature and in-situ pressure, the control module is used to open the switch door 7 of the protective chamber 1, so as to control the core ejector 4 to eject the core sampling chamber 5 and the drill bit component 6 to extract the core.

[0088] Step 506: After the core sampling chamber 5 springs back into the protective chamber 1, the control switch door 7 is closed, and the monitoring module and compensation module are used to keep the protective chamber 1 and the core sampling chamber 5 at their original temperature and pressure.

[0089] Since the above method is based on the same concept as the device embodiment of the present invention, the specific details can be found in the description of the device embodiment of the present invention, and will not be repeated here.

[0090] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permafrost coring device, characterized in that, include: Supports a fixing module, a core sampling module, a protection compartment (1), a monitoring module, a compensation module, and a control module; The support and fixing module includes a support frame (2) and a housing (3). The support frame (2) is used to fix the core sampling module, the protective chamber (1), the monitoring module, the compensation module and the control module. The housing (3) is set on the outside and is used to protect the core sampling module, the protective chamber (1), the monitoring module, the compensation module and the control module. The core sampling module includes a core ejector (4), a core chamber (5), and a drill bit assembly (6). The core ejector (4) is fixed to the bottom end of the support frame (2), the core chamber (5) is fixed to the bottom end of the core ejector (4), and the drill bit assembly (6) is located at the bottom end of the core chamber (5). The core ejector (4) is used to eject the core chamber (5) so that the drill bit assembly (6) can be used to extract cores from the frozen soil layer. The protective chamber (1) is fixed at the lower end of the support frame (2) and surrounds the outside of the core module. The bottom end of the protective chamber (1) is provided with a switch door (7). The protective chamber (1) is used to protect the core module. The switch door (7) is used to make the core chamber (5) and the drill bit component (6) pop out and bounce back into the protective chamber (1). The monitoring module is installed on the support frame (2) and is used to detect the temperature and pressure of the core sampling chamber (5) and the protective chamber (1); The compensation module is mounted on the support frame (2) and connected to an external compensator (90). The compensation module is used to compensate for the temperature and pressure of the core extraction chamber (5) and the protection chamber (1) based on the detection results of the monitoring module. The control module is mounted on the support frame (2) and is electrically connected to the core ejector (4), the drill bit component (6), the switch door (7), the monitoring module, the compensation module, and the external control terminal (80). The control module is used to control the working status of the core ejector (4), the drill bit component (6), the switch door (7), the monitoring module, and the compensation module according to the instructions of the control terminal (80), so that during the process of moving to the target position of the frozen soil layer, ejecting the core, and completing the core extraction, the temperature and pressure of the core extraction chamber (5) and the protective chamber (1) are maintained at the in-situ temperature and pressure of the frozen soil layer.

2. The apparatus according to claim 1, characterized in that, The switch door (7) includes: an electromagnetic relay (701) and a sealing cover (702); The electromagnetic relay (701) is located at the bottom of the protective chamber (1), and the sealing cover (702) is located on the electromagnetic relay (701). When the electromagnetic relay (701) is de-energized, the sealing cover (702) opens to allow the core chamber (5) and the drill bit component (6) to pop out and bounce back into the protective chamber (1). When the electromagnetic relay (701) is energized, the sealing cover (702) closes to seal the protective chamber (1).

3. The apparatus according to claim 1, characterized in that, The drill bit assembly (6) includes: an electric joint (601) and an electrothermal drill bit (602); the number of electric joints (601) and electrothermal drill bits (602) is equal; The electric joint (601) is located at the bottom of the core chamber (5), and the electric heating drill bit (602) is connected to the bottom of the core chamber (5) through the electric joint (601); when the electric joint (601) is closed, the electric heating drill bit (602) is sealed at the bottom of the core chamber (5); the electric heating drill bit (602) is used to drill and core at the target location of the frozen soil layer after heating.

4. The apparatus according to claim 1, characterized in that, The monitoring module includes: a monitor (8), a first pressure sensor (9), a first temperature sensor (10), a second pressure sensor (11), and a second temperature sensor (12). The first pressure sensor (9) and the first temperature sensor (10) are electrically connected to the monitor (8). The detection heads of the first pressure sensor (9) and the first temperature sensor (10) are set inside the protective chamber (1) and are used to detect the pressure and temperature inside the protective chamber (1) in real time and transmit the detection results to the monitor (8). The second pressure sensor (11) and the second temperature sensor (12) are electrically connected to the monitor (8) respectively. The detection heads of the second pressure sensor (11) and the second temperature sensor (12) extend into the core sampling chamber (5) and are used to detect the pressure and temperature in the core sampling chamber (5) in real time and transmit the detection results to the monitor (8). The monitor (8) is fixed on the support frame (2) and is used to send the detection results to the control module.

5. The apparatus according to claim 4, characterized in that, The compensation module includes: a compensation controller (13), a first compensation pipeline (14), a second compensation pipeline (15), and a third compensation pipeline (16). The compensation controller (13) is fixed on the support frame (2). The compensation controller (13) is used to control the temperature compensation amount and pressure compensation amount delivered to the second compensation pipeline (15) and the third compensation pipeline (16) respectively according to the detection results of the protection chamber (1) and the core sampling chamber (5) sent by the control module. The first compensation line (14) is connected at one end to the compensator (90) and at the other end to the compensation controller (13). The first compensation line (14) is used to connect the compensation controller (13) and the compensator (90). The second compensation line (15) is connected at one end to the compensation controller (13) and fixed at the other end inside the protective chamber (1). The second compensation line (15) is used to compensate for the pressure and temperature inside the protective chamber (1). The third compensation line (16) is connected at one end to the compensation controller (13) and extends into the core sampling chamber (5) at the other end. The third compensation line (16) is used to compensate for the pressure and temperature inside the core sampling chamber (5).

6. The apparatus according to claim 5, characterized in that, The second pressure sensor (11) and the second temperature sensor (12) are respectively fixed at the bottom ends of the two elastic telescopic tubes. The elastic telescopic tubes are fixed inside the core extraction chamber (5) so that the second pressure sensor (11) and the second temperature sensor (12) are both inside the core extraction chamber (5) during the pop-out and pop-back process of the core extraction chamber (5). The third compensation line (16) is an elastic and expandable tube, so that the third compensation line (16) remains inside the core chamber (5) during the pop-out and pop-back process of the core chamber (5).

7. The apparatus according to claim 5, characterized in that, The control module includes: a logic controller (17) and a signal receiver (18); The signal receiver (18) is electrically connected to the core ejector (4), the drill bit assembly (6) and the switch door (7) respectively. The signal receiver (18) is used to control the working status of the core ejector (4), the drill bit assembly (6) and the switch door (7). The logic controller (17) is electrically connected to the control terminal (80), the monitor (8), the compensation controller (13), and the signal receiver (18), respectively. The logic controller (17) sends control commands to the monitor (8), the compensation controller (13), and the signal receiver (18) according to the instructions of the control terminal (80). Before reaching the target location in the permafrost layer, the monitoring module and the compensation module are activated to detect the temperature and pressure of the protective chamber (1) and the core sampling chamber (5). When the temperature and pressure of the protective chamber (1) and the core sampling chamber (5) differ from the pre-obtained in-situ temperature and pressure, the corresponding temperature compensation and pressure compensation are calculated based on the detection results of the monitoring module, the in-situ temperature, and the in-situ pressure, so that the compensation... The controller (13) compensates the temperature and pressure of the protective chamber (1) and the core chamber (5) according to the temperature compensation amount and the pressure compensation amount, so that the protective chamber (1) and the core chamber (5) maintain the original temperature and pressure. When the target position is reached and the protective chamber (1) and the core chamber (5) are at the original temperature and pressure, the switch door (7) of the protective chamber (1) is opened, and the core ejector (4) is controlled to eject the core chamber (5) so that the drill bit component (6) at the bottom of the core chamber (5) starts core taking. After the core taking of the core chamber (5) is completed and bounced back, the switch door (7) of the protective chamber (1) is closed, and the monitoring module and the compensation module are used to keep the protective chamber (1) and the core chamber (5) at the original temperature and pressure.

8. The apparatus according to any one of claims 1-7, characterized in that, Also includes: The power supply assembly (19) installed on the support frame (2) is used to supply power to the core extraction module, the switch door (7), the monitoring module, the compensation module and the control module.

9. A permafrost coring system, characterized in that, Includes a control terminal (80), a compensator (90), and a permafrost coring device as described in any one of claims 1-8; The control terminal (80) is electrically connected to the frozen soil coring device and is used to send instructions to the frozen soil coring device; The compensator (90) is connected to the frozen soil coring device and is used to compensate for the temperature and pressure of the frozen soil coring device.

10. A method for coring frozen soil layers using the apparatus described in any one of claims 1-8, characterized in that, include: Obtain in-situ temperature and in-situ pressure of the frozen soil layer; The control and monitoring module detects the temperature and pressure of the protection chamber (1) and the core sampling chamber (5) in real time, and controls the compensation module to compensate the temperature and pressure of the protection chamber (1) and the core sampling chamber (5) based on the detection results, in-situ temperature and in-situ pressure, so that the temperature and pressure of the protection chamber (1) and the core sampling chamber (5) are equal to the in-situ temperature and in-situ pressure. When the target location of the frozen soil layer is reached, and the temperature and pressure of the protective chamber (1) and the core sampling chamber (5) are equal to the in-situ temperature and in-situ pressure, the control module is used to open the switch door (7) of the protective chamber (1) so as to control the core ejector (4) to eject the core sampling chamber (5) and the drill bit component (6) for core sampling. After the core sampling chamber (5) springs back into the protective chamber (1), the control door (7) is closed, and the monitoring module and the compensation module are used to keep the protective chamber (1) and the core sampling chamber (5) at their original temperature and pressure.

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