A thermoforming drill bit with built-in retractable drill pipe

Abstract

This invention discloses a thermomelting drill bit with a built-in retractable drill pipe, belonging to the field of thermomelting detection technology for subglacial lakes in polar regions. In this thermomelting drill bit, the motor rotates clockwise, and the nut and drill pipe assembly move linearly within a slot in the fixed outer tube. The drill pipe assembly can push open the sealing cap and extend from the main body of the thermomelting drill bit. The nut slides out of the slot in the fixed outer tube and enters the rotating bearing platform. The nut and screw are fixed in place by the anti-rotation part of the screw. The drill pipe assembly and nut rotate clockwise together. After completing the core sampling task, the screw and drill pipe assembly rotate counterclockwise. The nut enters the slot in the fixed outer tube under the constraint of the limit stop assembly, and the drill pipe assembly begins to retract. After the drill pipe assembly retracts, the ice core is transferred from inside the drill pipe assembly to inside the screw, and the sealing cap closes accordingly. This enables precise core sampling during thermomelting drilling and storage of the ice core within the screw.

Description

Technical Field

[0001] This invention belongs to the field of polar subglacial lake thermal melting detection technology, specifically, it relates to a thermal melting drill bit with a built-in retractable drill pipe. Background Technology

[0002] Numerous lakes lie beneath the Antarctic ice sheet, and scientific drilling and sampling of these subglacial lakes is crucial for studying their water quality and evolution. Currently, to achieve pollution-free drilling and sampling, a method involves installing an embedded winch within a thermomelting drill bit. During drilling, the winch lowers a cable, and the thermomelting drill bit heats up to melt the ice. The meltwater in the borehole behind the drill bit refreezes and seals the borehole, isolating the subglacial lake from the external environment and cutting off the source of pollution. However, conventional thermomelting drilling methods can only obtain water samples, not ice cores from specific points along the entire drilling process, such as deep ice layers near the subglacial lake. Given the need for diverse samples in subglacial lake research, including ice cores from deep ice layers for analyzing environmental evolution and microbial communities, a thermomelting drill bit capable of precisely drilling ice cores during subglacial lake sampling is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to provide a thermomelting drill bit with a built-in retractable drill pipe to solve the technical problem in the prior art that it is impossible to obtain ice core samples at a certain point during the entire drilling and extraction process of the ice sheet.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a thermomelting drill bit with a built-in retractable drill pipe includes a thermomelting drill bit assembly, the thermomelting drill bit assembly includes a thermomelting drill bit body and a heating rod installed in the thermomelting drill bit body, the thermomelting drill bit body is a hollow truncated cone structure, and the radius of the top surface of the truncated cone is larger than the radius of the bottom surface of the truncated cone. The thermomelting drill bit body is used for ice-melting drilling in ice layers, and the heating rod is used to heat the thermomelting drill bit body; the inner wall of the thermomelting drill bit body is coated or installed with a heat insulation layer to prevent the heat generated by the heating rod from affecting the internal temperature of the thermomelting drill bit body.

[0005] The built-in retractable drill pipe hot melt drill bit also includes a sealing cap assembly, a fixed outer tube, a drill pipe assembly, a screw, a nut, a motor, a limit stop assembly, and a rotary bearing platform; the sealing cap assembly is installed at the bottom end of the hot melt drill bit body, and the sealing cap assembly and the hot melt drill bit body rotate on one side to realize the opening and closing action of the sealing cap assembly, and the sealing cap assembly is used to seal the internal components of the hot melt drill bit body.

[0006] Specifically, the sealing cap assembly includes a sealing cap, a sealing pin, a sealing torsion spring, and a sealing ring. The sealing cap is located at the front end of the thermomelting drill bit body, and one side of the sealing cap is rotatably connected to the thermomelting drill bit body. The sealing torsion spring is installed on the sealing pin and is connected to the sealing cap so that the sealing cap is in a closed state. The sealing ring is installed on the neck ring of the sealing cap.

[0007] The screw is configured to be driven by a motor to rotate; the fixed outer tube is used to guide the extension and retraction of the drill pipe assembly. The fixed outer tube is fixed on the central axis of the thermomelting drill bit body, located outside the screw with their central axes coinciding. A groove is axially formed on the side wall of the fixed outer tube, extending longitudinally downwards through the lower end face of the fixed outer tube. The drill pipe assembly is used for ice core drilling. It is located inside the fixed outer tube and fixedly connected to a nut to form a whole. The drill pipe assembly includes a drill pipe and a core drill bit connected to the bottom of the drill pipe. A protrusion is provided on the outer wall of the nut, slidingly engaging with the groove axially, so that when the nut is threaded with the screw, it only moves linearly along the screw's axial direction as the screw rotates. The limiting block assembly is installed on the fixed outer tube, and when engaged with the nut, it restricts the nut to rotate only in one direction. The rotary bearing platform is located within the annular space between the limiting block assembly and the thermomelting drill bit assembly.

[0008] The motor is housed within a space enclosed by the motor housing and the motor housing end cover. The motor housing protects the motor, and the motor housing end cover is mounted on the motor housing to fix the motor. The motor housing end cover is also connected to the top of the thermoelectric drill bit body.

[0009] The motor shaft of the motor is coaxially connected to a coupling, and the end of the coupling away from the motor is coaxially connected to the screw through a connector fixed on the screw.

[0010] A connecting rod is connected to the fixed outer tube, and the connecting rod is connected to the end cover of the motor housing. The connecting rod is used to fix the fixed outer tube.

[0011] The limiting block assembly includes a fixed block, a stop block, a torsion spring, and a fixed pin. The fixed block is mounted on the fixed outer tube. The torsion spring is mounted on the fixed pin and is used to control the stop block to be in a working state or a non-working state. When the stop block is in a working state, it forces the protrusion block into the slot when the stop block cooperates with the protrusion block. The fixed pin is fixed on the fixed block.

[0012] Specifically, the stop block is used to restrict the nut to rotate only clockwise. When the nut rotates counterclockwise, the stop block hinders the nut from rotating circumferentially, forcing the protrusion on the nut into the slot of the fixed outer tube.

[0013] Specifically, the drill pipe assembly moves together with the nut along the slot of the fixed outer tube. When the protrusion slides out of the slot and enters the rotary bearing platform, the movement of the nut and the drill pipe assembly changes from linear movement to rotational movement.

[0014] Specifically, the bottom of the screw is provided with an anti-rotation part, the outer diameter of which is equal to the outer diameter of the thread on the screw. When the nut moves to the anti-rotation part, it is locked at that point due to the lack of thread transmission, and the nut and screw no longer move relative to each other. At this time, the protrusion slides out of the slot of the fixed outer tube and the opening of the fixed block and enters the rotary bearing platform. The nut rotates with the screw, and the hot-melt drill bit with built-in retractable drill tube moves downward as a whole, and the drill tube assembly begins to perform core extraction. When the motor rotates counterclockwise, the nut and the anti-rotation part of the screw move relative to each other under the constraint of the limit stop assembly. The nut enters the slot of the fixed outer tube with the cooperation of the threaded section of the screw, and the drill tube assembly begins to retract. The screw is hollow inside. After the core extraction work of the drill pipe assembly is completed, the motor rotates counterclockwise, and the drill pipe assembly begins to retract inside the thermomelting drill bit body. The inner wall of the anti-rotation part is set as a slope to guide the ice core during transfer. The obtained ice core is transferred from inside the drill pipe assembly to the screw inside for storage via the slope of the inner wall of the anti-rotation part.

[0015] Furthermore, the coring drill bit includes a coring drill bit body and a cutting head and a cutter mounted on the coring drill bit body. The cutting head is used to cut the ice layer, and the cutter is used to cut the ice core when the drill pipe retracts.

[0016] Through the above design scheme, the present invention can bring the following beneficial effects: Compared with the prior art, the thermomelting drill bit with built-in retractable drill pipe provided in this application embodiment, after the thermomelting drill bit body melts ice to the designated position, the motor rotates clockwise, and the nut and drill pipe assembly move linearly in the slot of the fixed outer tube. The drill pipe assembly can push open the sealing cover and extend out from the thermomelting drill bit body. The nut slides out of the slot of the fixed outer tube and enters the rotary bearing platform. The nut and screw are fixed under the constraint of the screw's anti-rotation part. The drill pipe assembly and nut rotate clockwise together. After completing the core sampling task, the screw and drill pipe assembly rotate counterclockwise. The protrusion on the nut enters the slot of the fixed outer tube under the constraint of the limit block assembly. The drill pipe assembly begins to retract. After the drill pipe assembly retracts, the ice core is transferred from the inside of the drill pipe assembly to the inside of the screw. The sealing cover closes accordingly, which can realize fixed-point core sampling in the thermomelting drilling process and store the ice core in the screw. Attached Figure Description

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram of a thermoforming drill bit structure with a built-in retractable drill tube provided in an embodiment of this application;

[0019] Figure 2 A cross-sectional view of a thermomelting drill bit with a built-in retractable drill pipe provided in an embodiment of this application;

[0020] Figure 3 A schematic diagram of the assembly structure of the fixed outer tube, nut and drill tube assembly of the hot melt drill bit with built-in telescopic drill tube provided in the embodiments of this application;

[0021] Figure 4 for Figure 3 An explosion diagram;

[0022] Figure 5 A schematic diagram of the limiting block assembly and nut mating structure of a hot melt drill bit with built-in retractable drill pipe provided in an embodiment of this application;

[0023] Figure 6 A schematic diagram of the limiting block assembly, nut, and drill bit assembly structure of a hot melt drill bit with built-in retractable drill pipe provided in an embodiment of this application;

[0024] Figure 7 A schematic diagram of the sealing cap assembly structure of a thermoforming drill bit with a built-in retractable drill tube provided in an embodiment of this application;

[0025] Figure 8 A cross-sectional view of the coring process of a thermomelting drill bit with a built-in retractable drill tube provided in an embodiment of this application;

[0026] Figure 9 A cross-sectional view of an ice core storage of a fusion drill bit with a built-in retractable drill tube provided in an embodiment of this application.

[0027] The markings in the diagram are as follows: 1-Sealing cap assembly; 101-Sealing cap; 102-Sealing torsion spring; 103-Sealing pin; 104-Sealing ring; 2-Thermomelactic drill bit assembly; 201-Thermomelactic drill bit body; 202-Heating rod; 3-Fixed outer tube; 301-Slot; 4-Drill pipe assembly; 401-Drill pipe; 402-Coring drill bit; 4021-Coring drill bit body; 4022-Cutting head; 4023 - Clamping device; 5- Screw; 501- Anti-rotation part; 6- Nut; 601- Protrusion; 7- Limiting block assembly; 701- Fixing block; 702- Stop block; 703- Torsion spring; 704- Fixing pin; 8- Motor; 801- Motor shaft; 9- Motor housing; 10- Motor housing end cover; 11- Ice core; 12- Connecting rod; 13- Connector; 14- Rotary bearing platform; 15- Coupling. Detailed Implementation

[0028] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, this invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solutions of this invention and actual circumstances. To avoid obscuring the essence of this invention, well-known methods, processes, flows, components, and circuits are not described in detail.

[0029] Please also refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The internal structure of a thermomelting drill bit with a built-in retractable drill tube provided in this application embodiment is described below. The thermomelting drill bit with a built-in retractable drill tube includes a sealing cap assembly 1, a thermomelting drill bit assembly 2, a fixed outer tube 3, a drill tube assembly 4, a screw 5, a nut 6, a limit stop assembly 7, a motor 8, and a rotating bearing platform 14. The motor 8 is mounted on a motor housing end cover 10, one end of which is connected to the thermomelting drill bit body 201, and the other end is connected to the motor housing 9. The inner wall of the thermomelting drill bit body 201 is fitted with or coated with a thermal insulation material layer to prevent the heat generated by the heating rod 202 from affecting the internal temperature of the thermomelting drill bit body 201. The motor shaft 801 of the motor 8 is connected to a coupling 15, and the other end of the coupling 15 is connected to a connector 13. The connector 13 is fixedly connected to the screw 5 and is used to drive the rotation of the screw 5. Nut 6 and screw 5 cooperate with each other. Since there is a protrusion 601 on nut 6, when screw 5 rotates, the protrusion 601 is constrained by the slot 301 of the fixed outer tube 3. Nut 6 can only move in a straight line along the slot 301 of the fixed outer tube 3 until it slides out of the slot 301.

[0030] Please also refer to Figure 3 and Figure 4The following describes a screw 5, nut 6, and fixed outer tube 3 of a thermomelting drill bit with a built-in retractable drill tube provided in an embodiment of this application. The screw 5 is hollow inside and is used to store ice core 11. The screw 5 cooperates with the nut 6, and the outer wall of the nut 6 is provided with a protrusion 601. The protrusion 601 and the groove 301 of the fixed outer tube 3 slide in the axial direction, so that when the nut 6 is engaged with the threaded section of the screw 5, the nut 6 moves linearly only along the axial direction of the screw 5 as the screw 5 rotates, thereby causing the drill tube assembly 4 to extend or retract relative to the thermomelting drill bit body 201.

[0031] Please also refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The following describes a limiting block assembly 7 for a thermomelting drill bit with a built-in retractable drill tube, provided in an embodiment of this application. When the protrusion 601 slides out of the slot 301 and the limiting block assembly 7 and enters the rotary bearing platform 14, the internal thread of the nut 6 moves to the anti-rotation part 501. At this time, the nut 6 and the screw 5 are locked, and the nut 6 and the screw 5 no longer move relative to each other. The nut 6 rotates with the screw 5 inside the rotary bearing platform 14, and the drill tube assembly 4 performs core extraction. The limiting block assembly 7 has a stop 702 and a fixing pin 704 installed on the fixing block 701, and a torsion spring 703 is provided on the fixing pin 704. When the nut 6 rotates clockwise, the protrusion 601 forces the stop 702 to lift, ensuring smooth movement. When the thermomelting drill bit with a built-in retractable drill tube moves downward as a whole, the drill tube assembly 4 begins core extraction. When the screw 5 rotates counterclockwise, the nut 6 and the anti-rotation part 501 of the screw 5 move against each other under the constraint of the stop block 702 and no longer get stuck. The nut 6 slides into the slot 301 of the fixed outer tube 3 with the cooperation of the threaded section of the screw 5, and the drill pipe assembly 4 begins to retract.

[0032] Please also refer to Figure 7 , Figure 8 and Figure 9The core extraction and sealing process of a thermomelting drill bit with a built-in retractable drill tube provided in this application embodiment will now be described. When the drill tube assembly 4 extends downward, the core extraction drill bit 402 contacts and pushes open the sealing cover 101. When the nut 6 enters the rotary bearing platform 14, the drill tube assembly 4 fully extends out of the thermomelting drill bit body 201. The drill tube assembly 4 rotates synchronously with the screw 5, and the thermomelting drill bit with the built-in retractable drill tube moves downward as a whole to perform core extraction. After the core extraction is completed, the motor 8 and the drill tube assembly 4 rotate counterclockwise, and the drill tube assembly 4 begins to retract. The cutter 4023 in the core extraction drill bit 402 cuts off the ice core 11 and retains the ice core 11 in the drill tube assembly 4. As the drill tube assembly 4 continues to retract, under the guidance of the inclined surface of the inner wall of the anti-rotation part 501, the ice core 11 is smoothly transferred from the drill tube assembly 4 to the screw 5. When the drill pipe assembly 4 is fully retracted into the thermomelting drill bit body 201, the sealing cover 101 closes under the action of the sealing torsion spring 102 and the sealing pin 103. Because the sealing cover 101 is equipped with a sealing ring 104, the sealing cover 101 does not close completely. At this point, the thermomelting drill bit with its built-in retractable drill pipe only needs to press down under its own weight to completely close the sealing cover 101, ensuring a sealed environment inside the thermomelting drill bit body 201. After completing the core sampling at the designated point, the thermomelting drill bit with its built-in retractable drill pipe continues thermomelting drilling.

[0033] It should be noted that the thermomelting drill bit with a built-in retractable drill tube provided in this application embodiment can be used not only for coring polar ice layers on Earth, but also for coring ice layers on other planets.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermomelting drill bit with a built-in retractable drill tube, comprising a thermomelting drill bit assembly (2), the thermomelting drill bit assembly (2) comprising a thermomelting drill bit body (201) and a heating rod (202) disposed in the thermomelting drill bit body (201), characterized in that: The main body (201) of the hot melt drill bit is a hollow truncated cone structure, and the radius of the top surface of the truncated cone is larger than the radius of the bottom surface of the truncated cone. The hot melt drill bit with built-in telescopic drill pipe also includes a sealing cap assembly (1), a fixed outer tube (3), a drill pipe assembly (4), a screw (5), a nut (6), a limit stop assembly (7), a motor (8), and a rotary bearing platform (14). The sealing cap assembly (1) is installed at the bottom end of the hot melt drill bit main body (201), and the sealing cap assembly (1) and the hot melt drill bit main body (201) are rotated on one side. To achieve the opening and closing action of the sealing cap assembly (1); the screw (5) is configured to be driven by a motor (8) to rotate, the screw (5) has a hollow structure for storing ice cores (11), and the bottom of the screw (5) has an anti-rotation part (501), the inner wall of the anti-rotation part (501) is set as an inclined surface; the fixed outer tube (3) is configured to be fixed on the central axis of the thermal fusion drill bit body (201), the fixed outer tube (3) is located outside the screw (5) and the central axes of the two coincide, and a slot (301) is provided axially on the side wall of the fixed outer tube (3), and The slot (301) extends longitudinally downward through the lower end face of the fixed outer tube (3); the drill pipe assembly (4) is located inside the fixed outer tube (3) and is fixedly connected to the nut (6) to form an integral whole. The drill pipe assembly (4) includes a drill pipe (401) and a core drill bit (402) connected to the bottom of the drill pipe (401); the outer wall of the nut (6) is provided with a protrusion (601), and the protrusion (601) slides axially with the slot (301) so that when the nut (6) is threadedly engaged with the screw (5), as the screw (5) rotates, the nut (6) only slides axially. The screw (5) moves linearly along the axis; the limiting block assembly (7) is installed on the fixed outer tube (3), and when the limiting block assembly (7) and the nut (6) cooperate with each other, the nut (6) is constrained to rotate only in one direction; the rotary bearing platform (14) is located in the annular space between the limiting block assembly (7) and the hot melt drill bit assembly (2), and the rotary bearing platform (14) corresponds to the anti-rotation part (501) of the screw (5) to restrict the nut (6) from entering the rotary bearing platform (14) and rotating synchronously with the screw (5).

2. The thermoforming drill bit with built-in retractable drill tube according to claim 1, characterized in that: The sealing cap assembly (1) includes a sealing cap (101), a sealing pin (102), a sealing torsion spring (103), and a sealing ring (104). The sealing cap (101) is located at the front end of the hot melt drill bit body (201), and one side of the sealing cap (101) is rotatably connected to the hot melt drill bit body (201). The sealing torsion spring (103) is installed on the sealing pin (102) and is connected to the sealing cap (101) so that the sealing cap (101) is in a closed state. The sealing ring (104) is installed on the neck ring of the sealing cap (101).

3. The thermoforming drill bit with built-in retractable drill tube according to claim 1, characterized in that: The inner wall of the thermomelting drill bit body (201) is coated or installed with a thermal insulation layer.

4. The thermoforming drill bit with built-in retractable drill tube according to claim 1, characterized in that: The motor (8) is set in the accommodating space enclosed by the motor housing (9) and the motor housing end cover (10). The motor housing end cover (10) and the motor housing (9) are detachably connected and fixed to form an integral whole. At the same time, the motor housing end cover (10) is detachably fixed to the top of the hot melt drill bit body (201).

5. The thermoforming drill bit with built-in retractable drill tube according to claim 4, characterized in that: A connecting rod (12) is connected to the fixed outer tube (3), and the connecting rod (12) is connected to the motor housing end cover (10).

6. The thermoforming drill bit with built-in retractable drill tube according to claim 1, characterized in that, The limiting block assembly (7) includes a fixing block (701), a stop block (702), a torsion spring (703), and a fixing pin (704). The fixing block (701) is mounted on the fixing outer tube (3). The fixing block (701) has an opening that extends through the side wall and the opening corresponds to the position of the slot (301). The torsion spring (703) is mounted on the fixing pin (704) and is used to control the stop block (702) to be in a working state or a non-working state. When the stop block (702) is in a working state, the stop block (702) cooperates with the protrusion block (601) to force the protrusion block (601) into the slot (301). The fixing pin (704) is mounted on the fixing block (701).

7. The thermoforming drill bit with built-in retractable drill tube according to claim 1, characterized in that, The motor shaft (801) of the motor (8) is coaxially connected to a coupling (15), and the end of the coupling (15) away from the motor (8) is coaxially connected to the screw (5) through a connector (13) fixed on the screw (5).

8. The thermoforming drill bit with built-in retractable drill tube according to claim 1, characterized in that, The core drill bit (402) includes a core drill bit body (4021) and a cutting head (4022) and a cutter (4023) mounted on the core drill bit body (4021).

Images