Hot melt drill bit with built-in telescopic drill pipe

Abstract

The invention discloses a hot melt drill bit with a built-in telescopic drill pipe, and belongs to the technical field of hot melt detection of polar subglacial lakes, a motor in the hot melt drill bit with the built-in telescopic drill pipe rotates clockwise, a nut and a drill pipe assembly linearly move in a clamping groove of a fixed outer pipe, and the drill pipe assembly can jack open a sealing cover and extend out of a hot melt drill bit body. The nut slides out of the clamping groove of the fixed outer pipe and enters the rotary bearing platform, the nut and the screw are fixed under the constraint of the rotation stopping part of the screw, the drill pipe assembly and the nut rotate clockwise together, after the coring task is completed, the screw and the drill pipe assembly rotate anticlockwise, the nut enters the clamping groove of the fixed outer pipe under the constraint of the limiting check block assembly, and the drill pipe assembly rotates anticlockwise. The drill pipe assembly starts to shrink, after the drill pipe assembly finishes shrinking, the ice core is transferred from the interior of the drill pipe assembly to the interior of the screw rod, the sealing cover is closed accordingly, fixed-point coring in the hot melt drilling process can be achieved, and the ice core is stored in the screw rod.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal melt detection of polar subglacial lakes, and in particular relates to a thermal melt drill bit with a built-in retractable drill pipe. Background Art

[0002] There are a large number of lakes under the Antarctic ice sheet. Scientific drilling and sampling of subglacial lakes under the ice sheet is an important measure to study the water quality environment and evolution process of subglacial lakes in Antarctica. To achieve pollution-free drilling and sampling of subglacial lakes, the current method is to install an embedded winch inside the hot melt drill. During the downward drilling process, the internal winch releases the cable, the hot melt drill head heats up to melt the ice and drill, and the meltwater in the hole behind the drill will refreeze and seal the borehole, thereby isolating the subglacial lake from the outside environment and cutting off the source of pollution in the subglacial lake. However, when sampling subglacial lakes, the conventional hot melt drilling coring method can only obtain lake water samples, and it is impossible to obtain ice core samples at a fixed point during the entire drilling process of the ice sheet, such as the deep ice layer close to the subglacial lake. Based on the demand for sample diversity in subglacial lake research, including the key significance of ice core samples from deep ice layers for analyzing the evolution of subglacial lake environments and microbial communities, there is an urgent need for a hot melt drill that can drill ice cores at a fixed point during the sampling process of subglacial lakes. Summary of the invention

[0003] The purpose of the present invention is to provide a hot melt drill bit with a built-in retractable drill pipe to solve the technical problem in the prior art that it is impossible to obtain an ice core sample at a certain point in the entire drilling process of the ice sheet.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a hot melt drill bit with a built-in retractable drill pipe includes a hot melt drill bit assembly, the hot melt drill bit assembly includes a hot melt drill bit body and a heating rod installed in the hot melt drill bit body, the hot melt 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 hot melt drill bit body is used for ice melting drilling in the ice layer, and the heating rod is used for heating the hot melt drill bit body; the inner wall of the hot melt drill bit body is coated or installed with a thermal insulation layer to prevent the heat generated by the heating rod from affecting the temperature inside the hot melt drill bit body.

[0005] The hot melt drill bit with a built-in retractable drill pipe also includes a sealing cover assembly, a fixed outer tube, a drill pipe assembly, a screw, a nut, a motor, a limit stop block assembly and a rotating bearing platform; the sealing cover assembly is installed at the bottom end of the hot melt drill bit body, and the sealing cover assembly and the hot melt drill bit body are matched with each other by unilateral rotation to realize the opening and closing action of the sealing cover assembly, and the sealing cover assembly is used to seal the internal components of the hot melt drill bit body.

[0006] Specifically, the sealing cover assembly includes a sealing cover, a sealing pin, a sealing torsion spring and a sealing ring. The sealing cover is arranged at the front end of the hot melt drill bit body, and one side of the sealing cover is rotatably connected to the hot melt drill bit body; the sealing torsion spring is installed on the sealing pin and is connected to the sealing cover at the same time so that the sealing cover is in a closed state; the sealing ring is installed on the neck ring of the sealing cover.

[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 configured to be fixed on the central axis of the hot melt drill bit body, the fixed outer tube is located outside the screw and the central axes of the two coincide, a slot is provided on the side wall of the fixed outer tube along the axial direction, and the slot longitudinally penetrates the lower end face of the fixed outer tube downward; the drill pipe assembly is used for drilling ice cores, the drill pipe assembly is located inside the fixed outer tube and is fixedly connected to the nut to form a whole, the drill pipe assembly includes a drill pipe and a coring drill bit connected to the bottom of the drill pipe; a protrusion is provided on the outer wall of the nut, the protrusion is axially slidably matched with the slot, so that when the nut is matched with the screw thread, the nut only moves linearly along the axial direction of the screw as the screw rotates; the limit stopper assembly is installed on the fixed outer tube, and when the limit stopper assembly and the nut are matched with each other, the nut is constrained to be able to rotate only in one direction. The rotary bearing platform is located in the annular space between the limit stopper assembly and the hot melt drill bit assembly.

[0008] The motor is arranged in a containing space surrounded by a motor casing and a motor casing end cover. The motor casing is used to protect the motor. The motor casing end cover is installed on the motor casing to fix the motor. At the same time, the motor casing end cover is connected to the top of the hot melt drill body.

[0009] The motor shaft of the motor is coaxially connected with a coupling, and one end of the coupling away from the motor is coaxially connected with the screw rod through a connecting head fixed on the screw rod.

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

[0011] The limit stop block assembly includes a fixed block, a stop block, a torsion spring and a fixed pin shaft, wherein the fixed block is mounted on the fixed outer tube; the torsion spring is mounted on the fixed pin shaft, and the torsion spring 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, the stop block cooperates with the protruding block to force the protruding block to enter the slot; the fixed pin shaft is fixed on the fixed block.

[0012] Specifically, the stopper is used to limit the nut to rotate only in the clockwise direction. When the nut rotates counterclockwise, the stopper hinders the nut from rotating in the circumferential direction, forcing the protruding block on the nut to enter the groove 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 protruding block slides out of the slot and enters the rotary bearing platform, the movement of the nut and the drill pipe assembly is transformed from linear movement to rotational movement.

[0014] Specifically, a rotation-stopping portion is provided at the bottom of the screw, and the outer diameter of the rotation-stopping portion is equal to the outer diameter of the thread on the screw. When the nut moves to the rotation-stopping portion, the nut is stuck there due to the lack of thread transmission, and the nut and the screw no longer move relative to each other. At this time, the protruding block slides out of the slot of the fixed outer tube and the opening of the fixed block into the rotary bearing platform. The nut rotates with the screw, and the hot melt drill bit of the built-in retractable drill pipe moves downward as a whole, and the drill pipe assembly begins to perform coring. When the motor rotates counterclockwise, the nut and the rotation-stopping portion of the screw are mutually displaced under the constraint of the limit stop block assembly, and the nut enters the slot of the fixed outer tube with the cooperation of the threaded section of the screw, and the drill pipe assembly begins to retract. The interior of the screw is hollow. When the coring work of the drill pipe assembly is completed, the motor rotates counterclockwise, and the drill pipe assembly begins to retract inside the hot melt drill bit body. The inner wall of the anti-rotation part is set as an inclined surface for guiding the transfer of ice cores. The obtained ice core is transferred from the drill pipe assembly to the screw via the inclined surface of the inner wall of the anti-rotation part for storage.

[0015] Furthermore, the coring drill bit includes a coring drill bit body, a cutter head and a breaker mounted on the coring drill bit body, the cutter head is used for cutting the ice layer, and the breaker is used for breaking the ice core when the drill pipe is contracted.

[0016] Through the above design scheme, the present invention can bring the following beneficial effects: Compared with the prior art, the embodiment of the present application provides a hot melt drill with a built-in retractable drill pipe. After the hot melt drill body melts ice and reaches the specified position, the motor rotates clockwise, and the nut and the 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 from the hot melt drill body. The nut slides out of the slot of the fixed outer tube and enters the rotary bearing platform. The nut and the screw are fixed under the constraint of the anti-rotation part of the screw. The drill pipe assembly and the nut rotate clockwise together. After completing the coring task, the screw and the drill pipe assembly rotate counterclockwise. The protrusion on the nut enters the slot of the fixed outer tube under the constraint of the limit stopper assembly. The drill pipe assembly begins to shrink. After the drill pipe assembly shrinks, the ice core is transferred from the inside of the drill pipe assembly to the inside of the screw, and the sealing cover is closed accordingly, which can realize the fixed-point coring during the hot melt drilling process and store the ice core in the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying any creative labor.

[0018] Figure 1 A schematic diagram of the structure of a hot melt drill bit with a built-in retractable drill pipe provided in an embodiment of the present application;

[0019] Figure 2 A cross-sectional view of a hot melt drill bit with a built-in retractable drill tube provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the assembly structure of a fixed outer tube, a nut and a drill pipe assembly of a hot melt drill bit with a built-in retractable drill pipe provided in an embodiment of the present application;

[0021] Figure 4 for Figure 3 Explosion diagram of

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

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

[0024] Figure 7 A schematic structural diagram of a sealing cover assembly of a hot melt drill bit with a built-in retractable drill pipe provided in an embodiment of the present application;

[0025] Figure 8 A cross-sectional view of the coring process of a hot melt drill bit with a built-in retractable drill pipe provided in an embodiment of the present application;

[0026] Fig. 9 A cross-sectional view of ice core storage of a hot melt drill bit with a built-in retractable drill tube provided in an embodiment of the present application.

[0027] The marks in the figure are as follows: 1-sealing cover assembly; 101-sealing cover; 102-sealing torsion spring; 103-sealing pin; 104-sealing ring; 2-hot melt drill assembly; 201-hot melt drill body; 202-heating rod; 3-fixed outer tube; 301-card slot; 4-drill pipe assembly; 401-drill pipe; 402-coring drill; 4021-coring drill body; 4022-cutter head; 4023 -clip; 5-screw; 501-stop part; 6-nut; 601-protrusion; 7-limit block assembly; 701-fixed block; 702-block; 703-torsion spring; 704-fixed pin; 8-motor; 801-motor shaft; 9-motor housing; 10-motor housing end cover; 11-ice core; 12-connecting rod; 13-connecting head; 14-rotating bearing platform; 15-coupling. DETAILED DESCRIPTION

[0028] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention is clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the present invention is not limited to the following embodiments, and the specific implementation method can be determined according to the technical scheme of the present invention and the actual situation. In order to avoid confusing the essence of the present invention, the known methods, processes, procedures, components and circuits are not described in detail.

[0029] Please also read Figure 1 , Figure 2 , Figure 3 and Figure 4 , the internal structure of a hot melt drill bit with a built-in retractable drill pipe provided in an embodiment of the present application is now described. The hot melt drill bit with a built-in retractable drill pipe includes a sealing cover assembly 1, a hot melt drill bit assembly 2, 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 motor 8 is mounted on the motor housing end cover 10, one end of the motor housing end cover 10 is connected to the hot melt drill bit body 201, and the other end is connected to the motor housing 9. The inner wall of the hot melt drill bit body 201 is installed or coated with a thermal insulation material layer to prevent the heat generated by the heating rod 202 from affecting the temperature inside the hot melt drill bit body 201. The motor shaft 801 of the motor 8 is connected to the coupling 15, the other end of the coupling 15 is connected to the connector 13, and the connector 13 is fixedly connected to the screw 5 for driving the screw 5 to rotate. The nut 6 cooperates with the screw rod 5. Since a protrusion 601 is provided on the nut 6, when the screw rod 5 rotates, the protrusion 601 is constrained by the slot 301 of the fixed outer tube 3, and the 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 read Figure 3 and Figure 4, the screw rod 5, nut 6 and fixed outer tube 3 of a hot melt drill with a built-in retractable drill pipe provided in an embodiment of the present application are now described. The screw rod 5 is hollow inside and is used to store ice cores 11. The screw rod 5 cooperates with the nut 6, and a protrusion block 601 is provided on the outer wall of the nut 6. The protrusion block 601 and the groove 301 of the fixed outer tube 3 slide in the axial direction, so that when the nut 6 cooperates with the threaded section of the screw rod 5, as the screw rod 5 rotates, the nut 6 only moves linearly along the axial direction of the screw rod 5, thereby making the drill pipe assembly 4 extend or retract relative to the hot melt drill bit body 201.

[0031] Please also read Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the limit stopper assembly 7 of a hot melt drill bit with a built-in retractable drill pipe provided in an embodiment of the present application is now described. When the protruding block 601 slides out of the slot 301 and the limit stopper assembly 7 and enters the rotary bearing platform 14, the thread inside the nut 6 just moves to the anti-rotation portion 501, at which time the nut 6 and the screw 5 are stuck, and the nut 6 and the screw 5 no longer move relative to each other. The nut 6 rotates inside the rotary bearing platform 14 along with the screw 5, and the drill pipe assembly 4 performs coring. A stopper 702 and a fixed pin 704 are installed on the fixed block 701 in the limit stopper assembly 7, and a torsion spring 703 is arranged on the fixed pin 704. When the nut 6 rotates clockwise, the protruding block 601 forces the stopper 702 to lift up to ensure the smoothness of the movement. When the hot melt drill bit with a built-in retractable drill pipe moves downward as a whole, the drill pipe assembly 4 starts coring. When the screw 5 rotates counterclockwise, the nut 6 and the anti-rotation portion 501 of the screw 5 are mutually displaced and no longer stuck under the constraint of the stop block 702, and the nut 6 slides into the groove 301 of the fixed outer tube 3 under the cooperation of the threaded section of the screw 5, and the drill pipe assembly 4 begins to retract.

[0032] Please also read Figure 7 , Figure 8 and Fig. 9, the coring and sealing process of a hot melt drill bit with a built-in retractable drill pipe provided in an embodiment of the present application is now described. When the drill pipe assembly 4 extends downward, the coring drill bit 402 contacts and pushes open the sealing cover 101. When the nut 6 enters the rotary bearing platform 14, the drill pipe assembly 4 completely extends out of the hot melt drill bit body 201. The drill pipe assembly 4 rotates synchronously with the screw 5, and the hot melt drill bit with a built-in retractable drill pipe moves downward as a whole to perform coring. When the coring work is completed, the motor 8 and the drill pipe assembly 4 rotate counterclockwise, the drill pipe assembly 4 begins to retract, and the breaker 4023 in the coring drill bit 402 breaks the ice core 11 and retains the ice core 11 in the drill pipe assembly 4. When the drill pipe assembly 4 continues to retract, under the guiding action of the inclined surface of the inner wall of the anti-rotation part 501, the ice core 11 is smoothly transferred from the drill pipe assembly 4 to the screw 5. When the drill pipe assembly 4 is completely retracted into the hot melt drill bit body 201, the sealing cover 101 is closed under the action of the sealing torsion spring 102 and the sealing pin 103. Since the sealing cover 101 is provided with a sealing ring 104, the sealing cover 101 is not completely closed. At this time, the hot melt drill bit with a built-in retractable drill pipe only needs to press downward by its own gravity to completely close the sealing cover 101 and ensure the closed environment inside the hot melt drill bit body 201. After completing the fixed-point coring work, the hot melt drill bit with a built-in retractable drill pipe continues hot melt drilling.

[0033] It should be noted that the hot melt drill bit with a built-in retractable drill pipe provided in the embodiment of the present application can be used not only for coring the ice layer in the Earth's polar regions, but also for coring the ice layer in 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 in the protection scope of the present invention.

Claims

1. A hot melt drill bit with a built-in retractable drill tube, comprising a hot melt drill bit assembly (2), wherein the hot melt drill bit assembly (2) comprises a hot melt drill bit body (201) and a heating rod (202) disposed in the hot melt drill bit body (201), characterized in that: The hot melt drill bit body (201) is a hollow truncated cone structure, and the radius of the top surface of the truncated cone is greater than the radius of the bottom surface of the truncated cone. The hot melt drill bit with a built-in retractable drill pipe also includes a sealing cover assembly (1), a fixed outer tube (3), a drill pipe assembly (4), a screw (5), a nut (6), a limit stop block assembly (7), a motor (8) and a rotary bearing platform (14); the sealing cover assembly (1) is installed at the bottom end of the hot melt drill bit body (201), and the sealing cover assembly (1) and the hot melt drill bit body (201) are unilaterally rotated to cooperate. To realize the opening and closing action of the sealing cover assembly (1); the screw rod (5) is configured to be driven by a motor (8) to rotate, the screw rod (5) has a hollow structure for storing an ice core (11), and the bottom of the screw rod (5) has a rotation-stopping portion (501), and the inner wall of the rotation-stopping portion (501) is arranged as an inclined surface; the fixed outer tube (3) is configured to be fixed on the central axis of the hot melt drill bit body (201), the fixed outer tube (3) is located outside the screw rod (5) and the central axes of the two coincide, and a slot (301) is provided on the side wall of the fixed outer tube (3) along the axial direction, and The slot (301) vertically penetrates the lower end surface of the fixed outer tube (3) downward; the drill pipe assembly (4) is located inside the fixed outer tube (3) and is fixedly connected to the nut (6) to form a whole; the drill pipe assembly (4) comprises a drill pipe (401) and a coring drill bit (402) connected to the bottom of the drill pipe (401); a protrusion (601) is provided on the outer wall of the nut (6); the protrusion (601) and the slot (301) are axially slidably matched, so that when the nut (6) and the screw rod (5) are threadedly matched, as the screw rod (5) rotates, the nut (6) only moves along the screw rod (5). The screw (5) performs axial linear motion; the limit stop block assembly (7) is mounted on the fixed outer tube (3); when the limit stop block assembly (7) and the nut (6) cooperate with each other, the nut (6) is constrained to rotate in only one direction; the rotary bearing platform (14) is located in the annular space between the limit stop block assembly (7) and the hot melt drill bit assembly (2), and the rotary bearing platform (14) corresponds to the position of the anti-rotation portion (501) of the screw (5), so as to limit the nut (6) from entering the interior of the rotary bearing platform (14) and rotating synchronously with the screw (5).

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

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

4. The hot melt drill bit with built-in retractable drill tube according to claim 1, characterized in that: The motor (8) is arranged in a receiving space surrounded by a motor casing (9) and a motor casing end cover (10); the motor casing end cover (10) and the motor casing (9) are detachably connected and fixed to form a whole; and the motor casing end cover (10) and the top end of the hot melt drill bit body (201) are detachably fixedly connected.

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

6. The hot melt drill bit with a built-in retractable drill tube according to claim 1, characterized in that: The position limiting block assembly (7) comprises a fixed block (701), a block (702), a torsion spring (703) and a fixed pin shaft (704); the fixed block (701) is mounted on the fixed outer tube (3); the fixed block (701) has an opening extending through the side wall, and the opening corresponds to the position of the slot (301); the torsion spring (703) is mounted on the fixed pin shaft (704); the torsion spring (703) is used to control the block (702) to be in a working state or a non-working state; when the block (702) is in a working state, the block (702) cooperates with the protruding block (601) to force the protruding block (601) to enter the slot (301); and the fixed pin shaft (704) is mounted on the fixed block (701).

7. The hot melt drill bit with a 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 one end of the coupling (15) away from the motor (8) is coaxially connected to the screw (5) via a connecting head (13) fixed on the screw (5).

8. The hot melt drill bit with a built-in retractable drill tube according to claim 1, characterized in that: The coring drill bit (402) comprises a coring drill bit body (4021) and a cutter head (4022) and a breaker (4023) mounted on the coring drill bit body (4021).

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