Large-diameter ice core hot-water-mechanical coupled coring drill

Abstract

This invention discloses a large-diameter ice core hot water-mechanical coupling coring drill bit, belonging to the field of polar ice core drilling technology. It includes, from top to bottom, a coaxially arranged cable suspension device, a first slewing bearing, an electronic component chamber, a reverse torque and drive system, a second slewing bearing, a meltwater chamber, an ice core tube, and a drill bit. It also includes a hot water circulation system located outside the meltwater chamber and the ice core tube, communicating with the sealed internal cavity of the meltwater chamber. During operation, the reverse torque and drive system drives the meltwater chamber, the ice core tube, and the drill bit to rotate synchronously. The drill bit mechanically cuts the ice layer at the bottom of the hole, allowing the ice core to enter the ice core tube. The ice debris generated during cutting is melted in the cutting area by hot water supplied by the hot water circulation system and flows back into the meltwater chamber with the meltwater. This invention utilizes hot water circulation to melt ice debris, completely solving the risk of stuck drill bits due to low ice debris transport efficiency, thus improving drilling efficiency, reliability, and safety.

Description

Technical Field

[0001] This invention belongs to the field of polar ice core drilling technology, and in particular relates to a large-diameter ice core hot water-mechanical coupling coring tool. Background Technology

[0002] Ice cores, as important records of paleoclimate and paleoenvironmental changes, are of significant scientific value for in-depth research on glacier evolution and global climate change when large-diameter ice cores are drilled. Currently, large-diameter ice core extraction mainly employs the electromechanical rotary cutting drilling method. A surface winch and armored cable are used to lower the drill string to the bottom of the borehole. Then, an internal motor drives the ice cutting chamber and ice core tube to rotate. The drill bit, connected to the bottom of the ice core tube, rotates synchronously to cut the ice layer, forming an ice core that enters the ice core tube. The resulting ice cuttings are transported upwards to the ice cutting chamber by a spiral conveyor belt located between the inner and outer tubes of the ice core tube. The upper end of the ice cutting chamber is connected to the drive system, and the outer tube of the drive system is equipped with an anti-torsion system, which is supported on the borehole wall to balance the anti-torque of the drill bit cutting the ice layer. While this method has been widely used in both shallow ice layer and deep ice core drilling in polar regions, its low auger conveyor efficiency leads to ice debris accumulation at the bottom of the borehole. Sometimes, ice debris can even cause blockages or refreezing at localized points on the auger conveyor belt, affecting both drilling efficiency and effective ice debris transport. In practice, stuck drill bits frequently occur due to untimely ice debris transport, and in severe cases, the armored cable may even break, causing the drill string to become stuck in the borehole and resulting in significant losses. This risk is particularly acute during large-diameter ice core drilling, where the amount of ice debris increases dramatically. Therefore, improving the efficiency of ice debris transport during the drilling process is a pressing problem that needs to be solved in large-diameter ice core drilling. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problems of low ice chip transportation efficiency, easy accumulation and blockage, refreezing, and high risk of stuck drill bits in existing large-diameter ice core mechanical drilling processes. It provides a large-diameter ice core hot water-mechanical coupling coring tool, which uses a combination of mechanical cutting of the ice layer and hot water circulation to melt the ice chips to efficiently remove the ice chips generated during drilling, reduce the probability of stuck drill bits, and improve the operational efficiency and reliability of large-diameter ice core drilling.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: A large-diameter ice core hot water-mechanical coupling coring drill bit includes, from top to bottom, a cable suspension device, a first slewing bearing, an electronic component chamber, a reverse torque and drive system, a second slewing bearing, a meltwater chamber, an ice core tube, and a drill bit, arranged coaxially. The lower end of the cable suspension device is rotatably connected to the electronic component chamber via the first slewing bearing. The lower end of the electronic component chamber is fixedly connected to the reverse torque and drive system. The lower end of the reverse torque and drive system is drively connected to the meltwater chamber via the second slewing bearing. The lower end of the meltwater chamber is fixedly connected to the ice core tube, and the lower end of the ice core tube is fixedly connected to the drill bit. The drill bit also includes a hot water circulation system located outside the meltwater chamber and the ice core tube, and communicating with the internal sealed cavity of the meltwater chamber. When the drill bit is working, the reverse torque and drive system drives the meltwater chamber, the ice core tube, and the drill bit to rotate synchronously. The drill bit mechanically cuts the ice layer at the bottom of the hole, and the ice core enters the ice core tube. The ice chips generated during cutting are melted in the cutting area of ​​the drill bit by hot water transported by the hot water circulation system and flow back into the meltwater chamber with the meltwater.

[0005] Furthermore, the hot water circulation system includes three drain pipes and three pumping pipes, both of which are arranged along the axial direction of the ice core tube on the outside of the ice core tube; the drain pipes and pumping pipes are arranged alternately along the circumference of the ice core tube, and the central angle between adjacent drain pipes and pumping pipes is 60°.

[0006] Furthermore, the outlets of the three drain pipes are located in the drill bit cutting area, and the lower ends of the three pumping pipes are located in the annular gap between the outer wall of the drill bit and the borehole wall. The drill bit, drain pipes, and pumping pipes together form a coupling structure of mechanical cutting and hot water circulation melting chips.

[0007] Furthermore, the melting chamber includes a melting chamber upper cover, a melting chamber shell, a melting chamber lower cover, an integrated water pump, a heating rod, a level gauge, and a temperature sensor; The upper cover of the melting chamber is fixedly connected to the outer ring of the second slewing bearing and is driven to the output end of the anti-torsion and drive system. The lower end of the upper cover of the melting chamber is detachably connected to the upper end of the melting chamber shell. The lower end of the melting chamber shell is detachably connected to the upper end of the lower cover of the melting chamber. The integrated water pump and temperature sensor are installed on the lower cover of the melting chamber. The heating rod and level gauge are installed on the inner wall of the melting chamber shell.

[0008] Furthermore, the integrated water pump is equipped with three drain outlets, three suction outlets, and a bypass drain pipe; the three drain outlets are respectively connected to three drain pipes in the hot water circulation system, the three suction outlets are respectively connected to three pumping pipes in the hot water circulation system, and the bypass drain pipe is connected to the interior of the melting chamber.

[0009] Furthermore, the drill bit includes a drill body, a cutting tool, a shoe, and an ice core cutter. The drill body is connected to the lower end of the ice core tube. The cutting tool and the shoe are disposed on the bottom lip surface of the drill body, and the ice core cutter is disposed in the middle of the drill body.

[0010] Furthermore, the outlets of the three drain pipes are at the same height and are arranged facing the cutting tool head of the drill bit. The three pumping pipes have different lower ends, forming a low-level pumping end, a middle-level pumping end, and a high-level pumping end, respectively.

[0011] Furthermore, the ice core tube has a single-layer tube structure, and six axially extending slots are provided on the circumferential outer wall of the ice core tube. The six slots are respectively matched with three drainage pipes and three pumping pipes. An upper clamp is provided on the outer side of the upper part of the ice core tube, and a lower clamp is provided on the outer side of the lower part near the drill bit. The three drainage pipes and three pumping pipes are all fixed in the corresponding slots by the upper and lower clamps.

[0012] Furthermore, heating strips are provided on the outer walls of the pipe sections of the three drainage pipes and the three pumping pipes located between the upper clamp and the lower clamp.

[0013] The large-diameter ice core hydrothermal-mechanical coupling coring tool provided by this invention has the following advantages compared with the prior art: The adoption of a single-layer ice core tube and a hot water circulation melting system not only completely solves the problems of ice chip accumulation, compaction, blockage, and secondary freezing that exist in existing drill bit spiral conveying systems, eliminating the safety hazard of stuck drill bits, but also significantly improves the safety and stability of large-diameter ice core drilling operations in extreme low-temperature environments such as polar regions and mountain glaciers. At the same time, the ice chips are converted into smaller volumes of meltwater, effectively shortening the overall length of the drill bit, increasing the single-pass drilling length, and eliminating the need for additional ice chip cleaning, thus significantly reducing drilling auxiliary time and significantly improving overall drilling efficiency. This can meet the high-efficiency drilling requirements of large-diameter ice cores in polar regions and plays an important role in promoting the development of large-diameter ice core drilling technology. Attached Figure Description

[0014] 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3This is a cross-sectional view of the melting chamber of the present invention; Figure 4 This is a schematic diagram illustrating the working principle of the hot water circulation system of the present invention. Figure 5 This is a cross-sectional view of the ice core tube and a design diagram of the distribution of the pumping and draining pipes of the present invention. Figure 6 This is a diagram showing the relative positions of the pumping and draining pipes and the drill bit in this invention. Figure 7 This is a cross-sectional view showing the relative positions of the suction and drainage pipes and the drill bit in this invention. Figure 8 This is a diagram illustrating the fixing method of the pumping and draining pipes according to the present invention.

[0016] In the diagram: 1-Cable suspension device, 7-First slewing bearing, 12-Electronic component chamber, 16-Anti-torsion and drive system, 27-Second slewing bearing, 29-Water melting chamber, 30-Water melting chamber upper cover, 31-Water melting chamber shell, 32-Water melting chamber lower cover, 33-Integrated water pump, 34-Heating rod, 35-Ice core tube, 37-Hot water circulation system, 38-Drain pipe, 39-Water suction pipe, 40-Drain outlet, 41-Water suction port, 42-Bypass drain pipe, 43-Upper clamp, 44-Heating belt, 45-Drill bit, 46-Drill bit body, 47-Cutting tool, 48-Insulating shoe, 49-Ice core clamp, 51-Level gauge, 52-Temperature sensor, 53-Groove, 54-Lower clamp. Detailed Implementation

[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments: Reference Appendix Figure 1-8As shown, this invention provides a large-diameter ice core hot water-mechanical coupling coring tool, comprising, from top to bottom, a cable suspension device 1, a first slewing bearing 7, an electronic component chamber 12, a reverse torque and drive system 16, a second slewing bearing 27, a meltwater chamber 29, an ice core tube 35, and a drill bit 45, arranged coaxially. The lower end of the cable suspension device 1 is rotatably connected to the electronic component chamber 12 via the first slewing bearing 7. The lower end of the electronic component chamber 12 is fixedly connected to the reverse torque and drive system 16. The lower end of the reverse torque and drive system 16 is drively connected to the meltwater chamber 29 via the second slewing bearing 27. The meltwater chamber 29... The lower end of 9 is fixedly connected to the ice core tube 35, and the lower end of the ice core tube 35 is fixedly connected to the drill bit 45. It also includes a hot water circulation system 37, which is located outside the meltwater chamber 29 and the ice core tube 35 and communicates with the internal sealed cavity of the meltwater chamber 29. When the drill is working, the reverse torque and drive system 16 drives the meltwater chamber 29, the ice core tube 35 and the drill bit 45 to rotate synchronously. The drill bit 45 mechanically cuts the ice layer at the bottom of the hole. The ice core enters the ice core tube 35. The ice chips generated by cutting are melted in the cutting area of ​​the drill bit 45 by the hot water transported by the hot water circulation system 37 and flow back to the meltwater chamber 29 with the meltwater.

[0018] In a preferred embodiment, the hot water circulation system 37 includes three drain pipes 38 and three pumping pipes 39, all of which are arranged axially along the outside of the ice core tube 35. The drain pipes 38 and pumping pipes 39 are arranged alternately along the circumference of the ice core tube 35, with a central angle of 60° between adjacent drain pipes 38 and pumping pipes 39. This arrangement ensures that the hot water discharge and meltwater extraction points are evenly distributed around the circumference of the ice core tube 35, facilitating the uniform melting of ice chips and timely recovery of meltwater within each cutting area around the drill bit 45.

[0019] In a preferred embodiment, the outlets of the three drain pipes 38 are located in the drill bit cutting area, and the lower ends of the three pumping pipes 39 are located in the annular gap between the outer wall of the drill bit and the borehole wall. The drill bit 45, drain pipes 38, and pumping pipes 39 together form a coupling structure for mechanical cutting and hot water circulation to melt ice chips. The three drain pipes 38 are used to transport the heated hot water in the melting water chamber 29 to the drill bit cutting area, allowing the hot water to directly participate in the melting of ice chips at the bottom of the hole. The three pumping pipes 39 are used to pump the melted water back to the melting water chamber 29, allowing the melted water to circulate between the melting water chamber 29, drain pipes 38, drill bit cutting area, and pumping pipes 39. Through the cooperation of the drain pipes 38 and pumping pipes 39, the conveyor belt is no longer used to transport ice chips; instead, the ice chips are melted into water in the cutting area at the bottom of the hole and then recycled.

[0020] In a preferred embodiment, the meltwater chamber 29 includes a meltwater chamber upper cover 30, a meltwater chamber shell 31, a meltwater chamber lower cover 32, an integrated water pump 33, a heating rod 34, a level gauge 51, and a temperature sensor 52. The meltwater chamber 29 is used to store meltwater generated and recycled during the hot water circulation process, and serves as the water supply and return chamber of the hot water circulation system 37. The integrated water pump 33 is used to provide the circulation power required for hot water discharge and meltwater recycling. The heating rod 34 is used to heat the meltwater in the meltwater chamber 29. The level gauge 51 is used to detect the meltwater level in the meltwater chamber 29. The temperature sensor 52 is used to detect the meltwater temperature at the bottom of the meltwater chamber 29, providing a temperature basis for the adjustment of the heating rod 34 and the hot water circulation system 37.

[0021] The upper cover 30 of the melting chamber is fixedly connected to the outer ring of the second slewing bearing 27 and is drivenly connected to the output end of the anti-torsion and drive system 16. The lower end of the upper cover 30 of the melting chamber is detachably connected to the upper end of the melting chamber shell 31. The lower end of the melting chamber shell 31 is detachably connected to the upper end of the lower cover 32 of the melting chamber. The integrated water pump 33 and the temperature sensor 52 are installed on the lower cover 32 of the melting chamber. The heating rod 34 and the level gauge 51 are installed on the inner wall of the melting chamber shell 31.

[0022] In a preferred embodiment, the integrated water pump 33 is provided with three drain outlets 40, three suction outlets 41, and a bypass drain pipe 42. The three drain outlets 40 are respectively connected to three drain pipes 38 in the hot water circulation system 37, and the three suction outlets 41 are respectively connected to three pumping pipes 39 in the hot water circulation system 37. The bypass drain pipe 42 is connected to the interior of the melting chamber 29. By providing the bypass drain pipe 42, while ensuring water supply to the drain pipes 38, the water inside the melting chamber 29 can be circulated and disturbed, which is beneficial to the uniformity of water temperature inside the melting chamber 29 and can reduce the flow fluctuation caused by all water flowing into the drain pipes 38.

[0023] In a preferred embodiment, the drill bit 45 includes a drill body 46, a cutting tool 47, a shoe 48, and an ice core cutter 49. The drill body 46 is connected to the lower end of the ice core tube 35. The cutting tool 47 and the shoe 48 are disposed on the bottom lip surface of the drill body 46, and the ice core cutter 49 is disposed in the middle of the drill body 46. The cutting tool 47 is used for mechanically cutting the ice layer at the bottom of the hole, the shoe 48 is used to assist in controlling the cutting depth and drilling posture of the drill bit 45, and the ice core cutter 49 is used to clamp and break the ice core when drilling ends and the drill string is lifted.

[0024] In a preferred embodiment, the three drain pipes 38 have the same outlet height and are respectively arranged toward the cutting tool 47 of the drill bit 45, so that hot water can directly act on the ice chips near the location where ice chips are generated, reducing the accumulation and compaction of ice chips at the bottom of the hole.

[0025] The three pumping pipes 39 have different lower ends, forming a low-level pumping end, a middle-level pumping end, and a high-level pumping end, respectively, to adapt to the pumping of meltwater under different liquid levels at the bottom of the hole, thereby improving the continuity and stability of meltwater recovery.

[0026] In a preferred embodiment, the ice core tube 35 is a single-layer tubular structure. Six axially extending slots 53 are provided on the circumferential outer wall of the ice core tube 35. The six slots 53 correspond to and cooperate with three drainage pipes 38 and three pumping pipes 39, respectively. The interior of the ice core tube 35 is used to accommodate the ice core formed by the drill bit 45 cutting. The exterior is equipped with the pipeline of the hot water circulation system 37 through the slots 53, which restricts the circumferential movement of the pipeline during the rotation of the drill bit.

[0027] An upper clamp 43 is provided on the upper outer side of the ice core tube 35, and a lower clamp 54 is provided on the lower outer side near the drill bit 45. The three drainage pipes 38 and the three pumping pipes 39 are all fixed in the corresponding slots 53 by the upper clamp 43 and the lower clamp 54. The two clamps and the slots 53 work together to radially constrain and circumferentially position the drainage pipes 38 and pumping pipes 39, preventing the pipelines from loosening, wearing, or detaching from the slots 53 during the lowering, rotating, and lifting of the drill bit, thereby ensuring the assembly stability between the hot water circulation system 37 and the ice core tube 35.

[0028] In a preferred embodiment, heating bands 44 are provided on the outer walls of the pipe sections of the three drain pipes 38 and the three pumping pipes 39 located between the upper clamp 43 and the lower clamp 54. Since this pipe section is the main exposed section of the drain pipes 38 and pumping pipes 39 extending axially along the outside of the ice core pipe 35, it is easily affected by the external low-temperature environment. Therefore, by providing heating bands 44 on the outer walls of this pipe section, the water in this section can be insulated or auxiliary heated, preventing the water from freezing inside the pipe during hot water transportation and meltwater recovery. Simultaneously, the heating bands 44 are positioned between the two clamps, which also facilitates that the heating bands 44 are confined along with the pipes to the corresponding area outside the ice core pipe 35.

[0029] The working process of this invention: After the drill bit is lowered to the bottom of the hole, the armored cable of the cable suspension device 1 supplies power to the reverse torque and drive system 16 via the electronic component chamber 12. The motor in the reverse torque and drive system 16 drives the meltwater chamber 29, the ice core tube 35, and the drill bit 45 to rotate via a reducer. The drill bit cuts through the ice layer to achieve drilling, and the ice core enters the ice core tube 35. At the same time, the integrated water pump 33 starts working, transporting the hot water in the meltwater chamber 29, heated by the heating rod 34, to the drill bit cutting area through three drain pipes 38 at a set flow rate, melting the ice chips produced by the drill bit 45 into water. The meltwater at the bottom of the hole flows back to the meltwater chamber 29 under the suction of the pumping pipe 39. The returned meltwater is reheated by the heating rod 34 in the meltwater chamber 29 and then transported by the integrated water pump 33 to the drill bit cutting area through the drain pipes 38, thus forming a hot water circulation. The heating rod 34 in the meltwater chamber 29 and the heating band 44 on the outer wall of the pipe section between the upper clamp 43 and the lower clamp 54 in the drain pipe 38 and the pumping pipe 39 are intermittently heated as needed to prevent the meltwater from freezing in the meltwater chamber 29 and the circulation pipeline, while saving energy consumption. When the drilling reaches the set depth, drilling is stopped, the drill string is lifted to break the ice core, and the drill string is brought to the surface to process the meltwater in the meltwater chamber 29 and the ice core in the ice core pipe 35. Then the drill string is lowered back to the bottom of the hole for the next drilling and coring operation.

[0030] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0031] It should be noted that in this application, relational terms such as "first" and "second" are used merely 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.

[0032] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A large-diameter ice core hot water-mechanical coupling coring drill bit, comprising, from top to bottom, a cable suspension device (1), a first slewing bearing (7), an electronic component chamber (12), a reverse torque and drive system (16), a second slewing bearing (27), a meltwater chamber (29), an ice core tube (35), and a drill bit (45), arranged coaxially from top to bottom. The lower end of the cable suspension device (1) is rotatably connected to the electronic component chamber (12) via the first slewing bearing (7), the lower end of the electronic component chamber (12) is fixedly connected to the reverse torque and drive system (16), the lower end of the reverse torque and drive system (16) is drively connected to the meltwater chamber (29) via the second slewing bearing (27), the lower end of the meltwater chamber (29) is fixedly connected to the ice core tube (35), and the lower end of the ice core tube (35) is fixedly connected to the drill bit (45). The drill bit is characterized in that... It also includes a hot water circulation system (37), which is located outside the meltwater chamber (29) and the ice core tube (35) and is connected to the internal sealed cavity of the meltwater chamber (29). When the drill is working, the reverse torque and drive system (16) drives the meltwater chamber (29), the ice core tube (35) and the drill bit (45) to rotate synchronously. The drill bit (45) mechanically cuts the ice layer at the bottom of the hole. The ice core enters the ice core tube (35). The ice chips generated by the cutting are melted in the cutting area of ​​the drill bit (45) by the hot water transported by the hot water circulation system (37) and flow back to the meltwater chamber (29) with the meltwater.

2. The large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 1, characterized in that, The hot water circulation system (37) includes three drain pipes (38) and three pump pipes (39). The drain pipes (38) and pump pipes (39) are arranged axially on the outside of the ice core pipe (35). The drain pipes (38) and pump pipes (39) are arranged alternately along the circumference of the ice core pipe (35), and the central angle between adjacent drain pipes (38) and pump pipes (39) is 60°.

3. The large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 2, characterized in that, The outlets of the three drain pipes (38) are located in the drill bit cutting area, and the lower ends of the three pumping pipes (39) are located in the annular gap between the outer wall of the drill bit and the borehole wall. The drill bit (45), drain pipes (38) and pumping pipes (39) together form a mechanical cutting and hot water circulation melting chip coupling structure.

4. A large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 2, characterized in that, The melting chamber (29) includes a melting chamber upper cover (30), a melting chamber shell (31), a melting chamber lower cover (32), an integrated water pump (33), a heating rod (34), a level gauge (51), and a temperature sensor (52); The upper cover (30) of the melting chamber is fixedly connected to the outer ring of the second slewing bearing (27) and is drivenly connected to the output end of the anti-torsion and drive system (16). The lower end of the upper cover (30) of the melting chamber is detachably connected to the upper end of the melting chamber shell (31). The lower end of the melting chamber shell (31) is detachably connected to the upper end of the lower cover (32) of the melting chamber. The integrated water pump (33) and temperature sensor (52) are installed on the lower cover (32) of the melting chamber. The heating rod (34) and level gauge (51) are installed on the inner wall of the melting chamber shell (31).

5. A large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 4, characterized in that, The integrated water pump (33) is equipped with three drain outlets (40), three suction outlets (41), and a bypass drain pipe (42); the three drain outlets (40) are respectively connected to three drain pipes (38) in the hot water circulation system (37), the three suction outlets (41) are respectively connected to three pumping pipes (39) in the hot water circulation system (37), and the bypass drain pipe (42) is connected to the interior of the melting chamber (29).

6. A large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 2, characterized in that, The drill bit (45) includes a drill body (46), a cutting tool (47), a shoe (48), and an ice core cutter (49). The drill body (46) is connected to the lower end of the ice core tube (35). The cutting tool (47) and the shoe (48) are disposed on the bottom lip of the drill body (46), and the ice core cutter (49) is disposed in the middle of the drill body (46).

7. A large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 6, characterized in that, The outlet heights of the three drain pipes (38) are the same, and they are arranged toward the cutting tool (47) of the drill bit (45); The lower ends of the three pumping pipes (39) are at different heights, forming a low-level pumping end, a middle-level pumping end, and a high-level pumping end, respectively.

8. A large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 2, characterized in that, The ice core tube (35) is a single-layer tube structure. Six axially extending slots (53) are provided on the circumferential outer wall of the ice core tube (35). The six slots (53) are respectively matched with three drainage pipes (38) and three pumping pipes (39). The upper outer side of the ice core tube (35) is provided with an upper clamp (43), and the lower outer side near the drill bit (45) is provided with a lower clamp (54). The three drainage pipes (38) and the three pumping pipes (39) are all fixed in the corresponding slots (53) by the upper clamp (43) and the lower clamp (54).

9. A large-diameter ice core hydrothermal-mechanical coupling coring tool according to claim 8, characterized in that, Heating strips (44) are provided on the outer walls of the pipe sections of the three drain pipes (38) and the three pumping pipes (39) located between the upper clamp (43) and the lower clamp (54).

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