Double-layer cutting hot-melt chip-removal large-diameter ice core coring drill

Abstract

The present application relates to polar ice layer drilling technology field, disclose a kind of double-layer cutting hot melt chip removal large-diameter ice core coring drill. The drill includes cable suspension and electronic component system, melt chip pump suction system, anti-torque and driving system and coring system arranged coaxially in sequence;Melt chip pump suction system includes water tank, water suction pump, water suction pipe and melt chip resistance wire, melt chip resistance wire is arranged around the outside of drill bit body in coring system, melt chip resistance wire is electrified and heated during drilling, for cutting the solid ice chip generated in real time hot melt into liquid melt water, water suction pump is used to pump melt water at the bottom of borehole to the inside of water tank for storage by water suction pipe.The present application eliminates the sticking accident caused by the fact that the ice chip is not removed cleanly when obtaining large-diameter ice core from the root, reduces the space occupied by melting the ice chip into water, has the advantages of compact structure, good ice core quality, high drilling efficiency, etc., and is suitable for coring operation in polar, alpine glacier and other scenes.

Description

Technical Field

[0001] This invention relates to the field of polar ice drilling technology, specifically to a double-layer cutting thermal melting chip removal large-diameter ice core drilling tool. Background Technology

[0002] Ice cores are high-resolution natural carriers for reconstructing the evolution of polar and paleoclimate environments and tracing the origins of atmospheric components. They have irreplaceable scientific research value in global climate change, glacier dynamics, and polar science research. Mechanical coring tools are widely used for coring in polar and mountain glaciers due to their advantages such as fast drilling speed, high efficiency, good ice core quality, reliable structure and operation, and strong environmental adaptability.

[0003] In conventional large-diameter ice core drilling operations, the drill bit breaking through the ice layer generates a large amount of fine ice chips, which must be discharged from the bottom of the hole in a timely manner. Otherwise, the ice chips will remain at the bottom of the hole or accumulate in localized areas of the drill bit, severely restricting drilling efficiency and leading to complex accidents such as stuck drill bits, thus affecting operational safety. Existing electromechanical core drilling tools generally use a chip removal method by adding a spiral strip to the outer wall of the ice core tube, forming a spiral conveying channel with the inner wall of the outer tube. The rotation of the drill bit drives the ice chips axially along the spiral strip to the upper ice chip chamber. However, the spiral mechanical chip removal method has low efficiency and incomplete chip removal. Large-diameter drilling produces a large amount of chips, and fine ice chips are easily retained at the bottom of the hole and accumulated and compacted, causing a sharp increase in the resistance of the drill bit rotation, which can easily induce stuck drill bit accidents. During the upward transport of ice chips along the spiral strip, they are also prone to blockage or refreezing in localized areas due to compression, causing interruption of the upward transport of ice chips, and in severe cases, even affecting the rotation of the drill bit. In addition, ice debris occupies a lot of space and makes the drill string longer, which restricts the drilling footage per run. Furthermore, the time required for ice debris removal is long, which significantly reduces the overall drilling efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a double-layer cutting and thermal melting chip removal core drilling tool for large-diameter ice cores. This core drilling tool uses a double-layer cutting tool for mechanical rotary cutting and thermal melting for efficient chip removal, thereby overcoming the technical problems of large ice chips generated by mechanical cutting, poor conventional spiral chip removal, and easy accumulation of ice chips at the bottom of the hole, which can lead to stuck drill accidents during existing large-diameter ice core drilling.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A double-layer cutting thermal melting chip removal large-diameter ice core coring drill bit includes a cable suspension and electronic component system, a chip pump suction system, a reverse torque and drive system, and a coring system arranged coaxially in sequence; The chip melting pump system includes a water tank, a water pump, a water pipe, and a chip melting resistance wire. The chip melting resistance wire is arranged around the outside of the drill bit body in the core drilling system. During drilling, the chip melting resistance wire is energized and heated to melt the solid ice chips generated by cutting into liquid water in real time. The water pump is used to pump the melt water at the bottom of the borehole to the inside of the water tank for storage through the water pipe. The coring system includes an ice core chamber, a drill bit body, an upper cutting tool, and a lower cutting tool. The ice core chamber is located at the upper end of the drill bit body to accommodate the ice core column. The upper cutting tool is located at the upper step inside the drill bit body, and the lower cutting tool is located on the bottom lip surface of the drill bit body, forming a double-layer cutting structure. The lower cutting tool is used for the initial breaking and cutting of the ice layer to form a borehole, and the upper cutting tool is used for the secondary cutting and trimming of the ice core column entering the ice core chamber.

[0006] Furthermore, the cuttings pump suction system also includes a third housing, the two ends of which are respectively connected to the cable suspension and electronic component system and the anti-torsion and drive system. The water tank is fixedly installed inside the third housing, and a water tank cover is threadedly connected to the top of the water tank. A water level sensor is installed inside the water tank. The water pump and the water level sensor are both threadedly connected to the water tank cover. The upper end of the suction pipe passes through the reserved through hole of the third housing and the water tank and communicates with the suction port of the water pump. The lower end is located in the outer ring area of ​​the drill bit body.

[0007] Furthermore, an external resistance wire is bolted inside the water suction pipe to heat the melted water during the transportation process and prevent the pipe from freezing and clogging. An internal resistance wire is circumferentially attached to the inner wall of the water tank to heat the stored melted water and prevent the melted water in the water tank from freezing again.

[0008] Furthermore, a heat insulation sleeve is provided between the melting resistance wire and the drill bit body. The melting resistance wire is threadedly connected to the heat insulation sleeve, and the two are nested together outside the drill bit body. The lower end of the water suction pipe is welded to the heat insulation sleeve.

[0009] Furthermore, the anti-torsion and drive system includes a threaded column, a limiting block, an adjusting plate, a leaf spring, a third cover plate, and a fourth outer shell. One end of the fourth outer shell is connected to the third cover plate, and the other end is bolted to the adapter plate in the core-taking system. One end of the threaded column is connected to the third cover plate, and the other end is connected to the third outer shell. The limiting block is threaded onto the threaded column. The adjusting plate is coaxially sleeved on the outside of the threaded column. Four sets of leaf springs are evenly distributed on the adjusting plate, and the bottom end of the leaf spring is bolted to the fourth outer shell. The rotating limit block feeds along the thread axis, which can compress the adjusting plate to move along the thread column, thereby changing the bending deformation of the leaf spring and realizing stepless adjustment of the counter-torque.

[0010] Furthermore, the anti-torque and drive system also includes a motor and a reducer disposed inside the fourth housing. The reducer is connected to the output shaft of the motor, and the two are coupled to provide deceleration torque for the rotary cutting of the drill bit body.

[0011] Furthermore, the coring system also includes an adapter plate, a lower slewing bearing, a break-off device, and a shoe. The outer ring of the lower slewing bearing is bolted to the adapter plate, and the inner ring is fixedly connected to the ice core chamber to support the ice core chamber to rotate smoothly with the drill bit. The top end of the drill bit body is threaded to the ice core chamber. The break-off device is assembled in a pre-drilled hole on the side wall of the ice core chamber through a pin and a torsion spring. The shoe is installed at the bottom of the lower cutting tool to adjust the cutting depth. During normal drilling, the clamping device contracts and avoids the pressure of the ice core column. When the drill is pulled up for recovery, the clamping device pops out under the action of a torsion spring and clamps the root of the ice core column.

[0012] Furthermore, a contact displacement sensor is threadedly installed at the top of the ice core chamber to trigger a stop drilling signal after the core is full.

[0013] Furthermore, the cable suspension and electronic component system includes an armored cable, a cable clamping block, a first cover plate, a first housing, an upper slewing bearing, a pressure sensor, a signal input processor, a signal output device, a second cover plate, a second housing, and a slip ring. One end of the first housing is connected to the first cover plate, and the other end is connected to the second cover plate via the upper slewing bearing. One end of the second housing is bolted to the second cover plate, and the other end is bolted to the third housing. One end of the armored cable is located inside the first housing, and the other end extends to the outside via the first cover plate. The cable clamping block is installed inside the first housing. The pressure sensor is located at the top inside the first housing. The signal input processor and the signal output device are located inside the first housing and are respectively located on both sides of the cable clamping block. The slip ring is located inside the second housing. The signal input processor is electrically connected to the pressure sensor, the water level sensor, and the contact displacement sensor, respectively, and is used to collect various operating parameters in real time and remotely issue control commands through the signal output device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The drilling tool of this invention abandons the traditional method of conveying ice chips with a spiral belt. Instead, it uses resistance wire thermal melting and pump-suction water storage to convert all ice chips at the bottom of the hole into liquid meltwater for extraction and storage. This fundamentally avoids the retention, accumulation, and compaction of ice chips, completely eliminating the risk of stuck drill bits during large-diameter ice core drilling, and significantly improving drilling efficiency and operational safety. Furthermore, it is equipped with upper and lower double-layer cutting tools. The lower cutting tool is responsible for cutting the ice layer to form a hole, while the upper cutting tool performs secondary trimming and cutting on the surface of the ice core column, removing the surface ice affected by meltwater wetting and thermal stress, thus ensuring the quality of the ice core. Because the spiral conveyor belt is eliminated and liquid meltwater replaces ice chips, the overall structure of the drilling tool is compact, easy to operate, requires less auxiliary time, and has strong adaptability to ice layers. In addition, the water absorption pipe, heat insulation sleeve, and water tank cavity of this invention are all equipped with independent electric heating resistance wires to achieve constant temperature and antifreeze for meltwater transportation and storage, avoiding pipe freezing and blockage and secondary freezing of meltwater, making it suitable for polar and extremely low temperature operating environments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall drilling tool of the present invention.

[0016] Figure 2 This is a front view of the drill bit of the present invention.

[0017] Figure 3 This is a cross-sectional view at point AA of the present invention.

[0018] Figure 4 This is a schematic diagram of the working principle of the chip removal pump suction system of the present invention.

[0019] Figure 5 This is a schematic diagram of the core extraction system of the present invention.

[0020] Figure 6 This is a cross-sectional view of the core extraction system of the present invention.

[0021] Figure 7 This is a schematic diagram of the cutting tool structure of the present invention.

[0022] Figure 8 This is a schematic diagram of the drilling tool of the present invention in use.

[0023] Explanation of reference numerals in the attached drawings: 1. Cable suspension and electronic component system; 2. Chip pump suction system; 3. Reverse torque and drive system; 4. Core sampling system; 21. Third outer casing; 22. Water tank; 23. Water tank cover; 24. Water pump; 25. Water level sensor; 26. Suction pipe; 27. External resistance wire; 28. Internal resistance wire; 29. ​​Chip resistance wire; 210. Heat insulation sleeve; 31. Threaded column; 32. Limiting block; 33. Adjusting plate; 34. Leaf spring; 35. Third cover plate; 36. Fourth outer casing; 37. Motor; 38. Reducer; 41. Adapter plate; 42. Lower slewing bearing; 43. Ice core chamber; 44. Contact displacement sensor; 45. Drill bit body; 46. Upper cutting tool; 47. Lower cutting tool; 48. Cutter; 49. Pad; 51. Ice core column; 52. Ice chips. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Combination Figures 1 to 8 This invention provides a double-layer cutting thermal melting chip removal large-diameter ice core coring drill bit. It achieves rapid core drilling in large-diameter ice layers through the combined action of mechanical cutting and thermal melting of chips, eliminating the risk of stuck drill bit from the root. At the same time, the upper and lower double-layer cutting structure performs initial drilling cutting and secondary surface trimming cutting on the ice core to ensure the quality of large-diameter ice cores and achieve efficient and safe drilling of large-diameter ice cores. It includes a cable suspension and electronic component system 1, a chip pump suction system 2, a reverse torque and drive system 3, and a core drilling system 4 arranged coaxially in sequence.

[0026] like Figure 3 As shown, in this embodiment, the cable suspension and electronic component system 1 includes an armored cable 11, a cable clamping block 12, a first cover plate 13, a first housing 14, an upper slewing bearing 15, a pressure sensor 16, a signal input processor 17, a signal output device 18, a second cover plate 19, a second housing 110, and a slip ring 111. One end of the first housing 14 is connected to the first cover plate 13, and the other end is connected to the second cover plate 19 via the upper slewing bearing 15. One end of the second housing 110 is connected to the second cover plate 19 via... The first housing 14 is bolted to the second housing 11, and the other end is bolted to the third housing 21. One end of the armored cable 11 is located inside the first housing 14, and the other end extends to the outside through the first cover plate 13. The cable clamping block 12 is installed inside the first housing 14. The pressure sensor 16 is located at the top inside the first housing 14. The signal input processor 17 and the signal output device 18 are located inside the first housing 14 and are located on both sides of the cable clamping block 12, respectively. The slip ring 111 is located inside the second housing 110.

[0027] The signal input processor 17 is electrically connected to the pressure sensor 16, water level sensor 25, and contact displacement sensor 44, respectively, to collect various working parameters in real time and remotely issue control commands through the signal output device, realizing automatic linkage control of resistance wire heating, drive motor start and stop, and surface winch drilling tool raising and lowering. The slip ring ensures uninterrupted power and signal transmission between the fixed and rotating parts of the drilling tool, while avoiding internal cable entanglement and damage caused by reverse torsion failure.

[0028] like Figure 3-4 As shown, in this embodiment, the molten metal pump suction system 2 includes a third outer shell 21, a water tank 22, a water tank cover 23, a suction pump 24, a suction pipe 26, an external resistance wire 27, an internal resistance wire 28, a molten metal resistance wire 29, a heat insulation sleeve 210, and a water level sensor 25. The two ends of the third outer shell 21 are connected to the cable suspension and electronic component system 1 and the anti-torsion and drive system 3, respectively. The water tank 22 is fixedly installed inside the third outer shell 21. The top of the water tank 22 is threadedly connected to the water tank cover 23. The water level sensor 25 is installed inside the water tank 22. Both the suction pump 24 and the water level sensor 25 are threadedly connected to the water tank cover 23. The upper end of the suction pipe 26 passes through the reserved through holes in the third outer shell 21 and the water tank 22 and communicates with the suction port of the suction pump 24. The lower end is located in the outer ring area of ​​the drill bit body 45. The melting resistance wire 29 is arranged around the outside of the drill bit body 45 in the core system 4. During the drilling process, the melting resistance wire 29 is energized and heated to melt the solid ice chips generated by cutting into liquid water in real time. The water pump 24 is used to pump the melt water at the bottom of the borehole to the inside of the water tank 22 for storage through the water suction pipe 26.

[0029] Preferably, an external resistance wire 27 is bolted to the inside of the water suction pipe 26 to heat the melted water during the transportation process and prevent the pipe from freezing and blocking it. An internal resistance wire 28 is circumferentially attached to the inner wall of the water tank 22 to heat the stored melted water and prevent the melted water in the water tank 22 from freezing again.

[0030] Preferably, a heat insulation sleeve 210 is provided between the melting resistance wire 29 and the drill body 45. The melting resistance wire 29 and the heat insulation sleeve 210 are threaded together, and the two are nested together on the outside of the drill body 45. The lower end of the water suction pipe 26 is welded to the heat insulation sleeve 210.

[0031] During drilling, the melting resistance wire 29 is energized and heats up, melting the solid ice chips generated by the drill bit into liquid water in real time. The melt water from the bottom of the hole is pumped to the water tank 22 for centralized storage via the water pump 24 and the water pipe 26. The internal resistance wire 28 inside the water tank 22 and the external resistance wire 27 outside the pipeline maintain a constant temperature for heating and freezing throughout the melt water transportation and storage process, preventing pipeline freezing and blockage and secondary freezing of the melt water under the low polar temperatures. The water level sensor 25 monitors the water level in the water tank 22 in real time, and outputs a signal to stop drilling when the water is full.

[0032] like Figure 3 As shown, in this embodiment, the anti-torque and drive system 3 includes a threaded post 31, a limiting block 32, an adjusting plate 33, leaf springs 34, a third cover plate 35, a fourth outer shell 36, a motor 37, and a reducer 38. One end of the fourth outer shell 36 is connected to the third cover plate 35, and the other end is bolted to the adapter plate 41 in the core extraction system 4. One end of the threaded post 31 is connected to the third cover plate 35, and the other end is connected to the third outer shell 21. The limiting block 32 is threaded onto the threaded post 31. The adjusting plate 33 is coaxially sleeved on the outside of the threaded post 31. Four sets of leaf springs 34 are evenly distributed on the adjusting plate 33, and the bottom ends of the leaf springs 34 are bolted to the fourth outer shell 36.

[0033] Using this scheme, the rotating limit block 32 can be fed along the thread axis, pressing the adjusting plate 33 and changing the bending deformation of the leaf spring 34, thereby achieving stepless adjustment of the anti-torque and adapting to the anti-torque requirements of different hole diameters and different formations. The motor 37 and the reducer 38 are threadedly connected, and the output shaft of the motor 37 is driven by the reducer 38. The two are threadedly fixed inside the fourth outer casing 36, providing a stable deceleration torque for the drill bit's rotary cutting.

[0034] like Figure 3-7 As shown, in this embodiment, the core sampling system 4 includes an adapter plate 41, a lower slewing bearing 42, an ice core chamber 43, a contact displacement sensor 44, a drill bit body 45, an upper cutting tool 46, a lower cutting tool 47, a cutter 48, and a shoe 49. The outer ring of the lower slewing bearing 42 is bolted to the adapter plate 41, and the inner ring is fixedly connected to the ice core chamber 43, supporting the ice core chamber 43 to rotate smoothly with the drill bit. The top of the drill bit body 45 is threaded to the ice core chamber 43. The cutter 48 is fitted into a pre-drilled hole in the side wall of the ice core chamber 43 via a pin and a torsion spring. The shoe 49 is installed at the bottom of the lower cutting tool 47 to adjust the cutting depth. The ice core chamber 43 is located at the upper end of the drill bit body 45 to accommodate the ice core column 51. The upper cutting tool 46 is set at the upper step inside the drill bit body 45, and the lower cutting tool 47 is set on the bottom lip surface of the drill bit body 45, forming a double-layer cutting structure. The lower cutting tool 47 is used for the initial breaking and cutting of the ice layer to form a borehole, and the upper cutting tool 46 is used for the secondary cutting and finishing of the ice core column 51 that enters the ice core chamber 43.

[0035] Preferably, a contact displacement sensor 44 is threaded onto the top of the ice core chamber 43 to trigger a stop drilling signal after the core is full.

[0036] During operation, a small amount of ice chips generated during the secondary cutting process slides down the ice core slope through the drill bit's preset window to the bottom of the hole. These chips are then melted by the melting resistance wire 29 and pumped into the water tank 22 along with the melted ice chips from the initial cutting. The cutter 48 is mounted in a pre-drilled hole on the side wall of the ice core chamber 43 via a pin and torsion spring. During normal drilling, the ice core compresses and retracts the cutter 48 to avoid impact. When the drill is pulled back for retrieval, the cutter 48 pops out under the action of the torsion spring, securing the root of the ice core and ensuring reliable cutting to prevent it from falling out.

[0037] In this embodiment, the core sampling system 4 is equipped with upper and lower double-layer cutting tools, along with multiple sets of resistance wires, melt-blown pumping pipelines, and a full-process heating and anti-freezing structure to ensure reliable operation. During drilling, the lower cutting tool 47 completes the initial cutting of the ice layer. The resulting ice chips are melted into liquid water by heating with resistance wires and pumped to the water tank 22 at the top of the drill string for centralized storage. During the upward movement of the ice core column, the upper cutting tool 46 performs a secondary trimming cut, removing the surface structure of the ice core affected by meltwater, effectively ensuring the integrity of the original ice core and the quality of the sample. The ice chips generated by the secondary cutting are discharged into the bottom of the hole through the drill bit window to melt. After the ice core chamber 43 is full, the contact displacement sensor 44 prompts to stop drilling, and the drill string is retrieved by the surface winch.

[0038] In this embodiment, the drill bit instantly melts the ice debris generated during drilling into water, and the meltwater is pumped away from the bottom of the hole through the suction pipe 26 and the suction pump 24, eliminating the accumulation of ice debris at its source and completely solving the problem of stuck drill bit caused by incomplete debris removal. Simultaneously, the drill bit is equipped with a double-layer cutting tool. In addition to meeting normal drilling needs, the upper cutting tool 46 performs secondary cutting on the ice core, removing the surface layer of the ice core affected by meltwater, ensuring the quality of the ice core, and guaranteeing the safe and reliable drilling of large-diameter ice cores. By melting the ice debris into water, its space occupation is reduced, resulting in a compact structure, high-quality ice cores, and high drilling efficiency. It is suitable for efficient core drilling of large-diameter undisturbed ice cores in polar and high-altitude glacier environments.

[0039] Working principle: Before drilling, the opening amplitude of the leaf spring 34 in the anti-torsion and drive system 3 is pre-adjusted on the surface according to the inner diameter of the ice hole to ensure reliable anti-torsion while providing stable drilling pressure using the drill bit's own weight. Then, the drill bit is smoothly lowered to the bottom of the borehole using a surface winch and armored cable 11. The pressure sensor 16 at the cable end collects the pressure signal, which is transmitted to the surface via the signal input processor 17 to determine the drill bit's bottom contact status. After bottom contact is confirmed, the drill bit is controlled to work. The drive motor 37 drives the ice core chamber 43, drill bit body 45, and double-layer cutting tool to rotate synchronously via the reducer 38. The cutting tool 47 on the bottom lip performs large-diameter rotary cutting on the ice layer, and the melting resistance wire 29 on the outside of the drill bit is turned on simultaneously to heat and melt the large amount of ice chips generated by cutting into liquid melt water in real time. Then, the water pump 24 is started, and the meltwater at the bottom of the hole is continuously pumped to the upper water tank 22 for sealed storage through the water suction pipe 26; the outer resistance wire 27 on the outside of the water suction pipe 26 and the inner resistance wire 28 on the inner wall of the water tank 22 are simultaneously energized to heat the water supply pipeline and the water storage cavity throughout the process, preventing the meltwater from freezing and the pipeline from becoming blocked in the polar low temperature environment; the water level sensor 25 built into the water tank 22 monitors the water storage volume in real time, and issues a stop drilling warning signal when the rated volume is reached.

[0040] As drilling progresses, the ice core column enters the drill bit body 45 and undergoes secondary trimming by the built-in upper cutting tool 46, removing the surface layer of the ice core disturbed by meltwater and forming a regular ice core column. The fine ice chips generated by the secondary trimming slide down the ice core slope from the drill bit window back to the bottom of the hole, where they are melted and incorporated into the pump's chip removal cycle. The ice core column continues to enter the ice core chamber 43. When the top of the ice core column touches the sensing end of the contact displacement sensor 44, the sensor sends a full core signal, and the control system commands the drilling operation to stop. Subsequently, the drill string is lifted and retrieved as a whole by a surface winch via the armored cable 11. During the retrieval process, the ice core cutter 48 automatically cuts the ice core, completing a single core extraction cycle.

[0041] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A double-layer cutting thermal melting chip removal large-diameter ice core coring drill, characterized in that, It includes a cable suspension and electronic component system (1), a chip pump suction system (2), a reverse torque and drive system (3), and a core extraction system (4) arranged coaxially in sequence. The chip removal pump system (2) includes a water tank (22), a water pump (24), a water pipe (26), and a chip removal resistance wire (29). The chip removal resistance wire (29) is arranged around the outside of the drill bit body (45) in the core system (4). During the drilling process, the chip removal resistance wire (29) is energized and heated to melt the solid ice chips generated by cutting into liquid water in real time. The water pump (24) is used to pump the water from the bottom of the borehole to the inside of the water tank (22) for storage through the water pipe (26). The core sampling system (4) includes an ice core chamber (43), a drill bit body (45), an upper cutting tool (46), and a lower cutting tool (47). The ice core chamber (43) is located at the upper end of the drill bit body (45) to accommodate the ice core column (51). The upper cutting tool (46) is located at the upper step inside the drill bit body (45). The lower cutting tool (47) is located on the bottom lip of the drill bit body (45) to form a double-layer cutting structure. The lower cutting tool (47) is used to initially break and cut the ice layer to form a borehole. The upper cutting tool (46) is used to perform secondary cutting and trimming on the ice core column (51) that enters the ice core chamber (43).

2. The double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 1, characterized in that, The chip pump suction system (2) also includes a third housing (21). The two ends of the third housing (21) are respectively connected to the cable suspension and electronic component system (1) and the anti-torsion and drive system (3). The water tank (22) is fixedly installed inside the third housing (21). The top of the water tank (22) is threadedly connected to the water tank cover (23). The water tank (22) is equipped with a water level sensor (25). The water pump (24) and the water level sensor (25) are both threadedly connected to the water tank cover (23). The upper end of the suction pipe (26) passes through the reserved through hole of the third housing (21) and the water tank (22) and communicates with the suction port of the water pump (24). The lower end is located in the outer ring of the drill bit body (45).

3. The double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 2, characterized in that, The inside of the water suction pipe (26) is connected by bolts to an external resistance wire (27) for heating the melt water during the transportation process to prevent the pipe from freezing and blocking. The inner wall of the water tank (22) is circumferentially fitted with an internal resistance wire (28) for heating the stored melt water to prevent the melt water in the water tank (22) from freezing again.

4. A double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 2 or 3, characterized in that, A heat insulation sleeve (210) is provided between the melting resistance wire (29) and the drill body (45). The melting resistance wire (29) is threadedly connected to the heat insulation sleeve (210), and the two are nested together outside the drill body (45). The lower end of the water suction pipe (26) is welded to the heat insulation sleeve (210).

5. A double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 4, characterized in that, The anti-torque and drive system (3) includes a threaded column (31), a limiting block (32), an adjusting plate (33), a leaf spring (34), a third cover plate (35), and a fourth outer shell (36). One end of the fourth outer shell (36) is connected to the third cover plate (35), and the other end is bolted to the adapter plate (41) in the core extraction system (4). One end of the threaded column (31) is connected to the third cover plate (35), and the other end is connected to the third outer shell (21). The limiting block (32) is threaded onto the threaded column (31). The adjusting plate (33) is coaxially sleeved on the outside of the threaded column (31). Four sets of leaf springs (34) are evenly distributed on the adjusting plate (33). The bottom end of the leaf spring (34) is bolted to the fourth outer shell (36). The rotating limit block (32) feeds along the thread axis, which can squeeze the adjusting plate (33) to move along the thread column (31), thereby changing the bending deformation of the leaf spring (34) and realizing stepless adjustment of the anti-torque.

6. A double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 5, characterized in that, The anti-torque and drive system (3) also includes a motor (37) and a reducer (38) disposed inside the fourth housing (36). The reducer (38) is connected to the output shaft of the motor (37), and the two are driven together to provide deceleration torque for the rotary cutting of the drill body (45).

7. A double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 5, characterized in that, The coring system (4) also includes an adapter plate (41), a lower slewing bearing (42), a break-off device (48), and a shoe pad (49). The outer ring of the lower slewing bearing (42) is bolted to the adapter plate (41), and the inner ring is fixedly connected to the ice core chamber (43) to support the ice core chamber (43) to rotate smoothly with the drill bit. The top of the drill bit body (45) is threaded to the ice core chamber (43). The break-off device (48) is assembled in the pre-drilled hole on the side wall of the ice core chamber (43) through a pin and a torsion spring. The shoe pad (49) is installed at the bottom of the lower cutting tool (47) to adjust the cutting depth. During normal drilling, the clamping device (48) is squeezed and contracted by the ice core column (51) to avoid it. When the drill is pulled up and retrieved, the clamping device (48) pops out under the action of the torsion spring and clamps the root of the ice core column (51).

8. A double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 7, characterized in that, A contact displacement sensor (44) is threaded onto the top of the ice core chamber (43) to trigger a stop drilling signal after the core is full.

9. A double-layer cutting thermal melting chip removal large-diameter ice core coring drill as described in claim 8, characterized in that, The cable suspension and electronic component system (1) includes an armored cable (11), a cable clamping block (12), a first cover plate (13), a first housing (14), an upper slewing bearing (15), a pressure sensor (16), a signal input processor (17), a signal output device (18), a second cover plate (19), a second housing (110), and a slip ring (111). One end of the first housing (14) is connected to the first cover plate (13), and the other end is connected to the second cover plate (19) through the upper slewing bearing (15). One end of the second housing (110) is bolted to the second cover plate (19), and the other end is bolted to the second cover plate (19). The end is bolted to the third housing (21). One end of the armored cable (11) is located inside the first housing (14), and the other end extends to the outside through the first cover plate (13). The cable clamping block (12) is installed inside the first housing (14). The pressure sensor (16) is located at the top inside the first housing (14). The signal input processor (17) and the signal output device (18) are located inside the first housing (14) and are respectively located on both sides of the cable clamping block (12). The slip ring (111) is located inside the second housing (110). The signal input processor (17) is electrically connected to the pressure sensor (16), the water level sensor (25), and the contact displacement sensor (44) respectively, and is used to collect various working condition parameters in real time and remotely issue control commands through the signal output device (18).

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