In-situ shape-preserving sampling drill for soft coal seam

Abstract

The application provides an in-situ shape-keeping sampling drilling tool suitable for soft coal seams, which comprises a shell penetrating through two ends, a spiral drill rod assembly penetrating through the shell, the spiral drill rod assembly comprising an inner cylinder penetrating through the shell, one end of the inner cylinder being detachably provided with a drill head mechanism, the other end of the inner cylinder being provided with a round drill rod, the inner cylinder being provided with a heat dissipation mechanism for dissipating heat of the drill head mechanism at the end of the inner cylinder toward the drill head mechanism, and a fixing mechanism being arranged between the drill head mechanism and the inner cylinder. The heat dissipation mechanism is arranged to dissipate heat of the drill head mechanism, and the fixing mechanism is arranged to detachably fix the drill head and the inner cylinder, so that the technical effect of facilitating disassembly of the drilling tool is achieved.

Description

Technical Field

[0001] This invention relates to the field of sampling technology for soft coal seams, and in particular to an in-situ conformal sampling drill tool suitable for soft coal seams. Background Technology

[0002] In-situ conformal sampling drills for soft coal seams are specially designed to obtain core samples that retain their original shape and structure in soft coal seams. Their core objective is to minimize disturbance to the coal seam structure during sampling and ensure that the in-situ physical and chemical properties of the core sample are not damaged, thereby providing accurate data support for coalbed methane development and geological research.

[0003] A search revealed Chinese patent CN104314482B, which discloses a closed-loop spiral borehole protection drill bit for drilling soft coal seams and its usage method, including a closed-loop spiral borehole protection drill rod and a spiral cuttings guide drill bit. This invention features a novel design, employing an innovative spiral blade structure to provide borehole protection. Drill cuttings are transported within a protected space, preventing borehole deformation and collapse, thus overcoming the problems of high drilling resistance and low cuttings removal efficiency of conventional casing drill bits. The existing technical solutions described above have the following drawbacks: they lack a heat dissipation structure, leading to a rapid temperature increase during prolonged sampling, affecting the use of the drill bit; and the drill bit structure is inconvenient for disassembly and maintenance, resulting in poor applicability. Therefore, this invention proposes an in-situ conformal sampling drill bit suitable for soft coal seams to address these issues. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To achieve the above objectives, the present invention proposes an in-situ conformal sampling drill tool suitable for soft coal seams, comprising a shell penetrating at both ends, a spiral drill rod assembly penetrating inside the shell, the spiral drill rod assembly comprising an inner cylinder penetrating inside the shell, a drill bit mechanism detachably disposed at one end of the inner cylinder, and a round drill rod disposed at the other end of the inner cylinder;

[0006] The inner cylinder is provided with a heat dissipation mechanism for dissipating heat from the drill bit mechanism at the end facing the drill bit mechanism. A fixing mechanism is provided between the drill bit mechanism and the inner cylinder.

[0007] This invention achieves heat dissipation for the drill bit mechanism by setting up a heat dissipation mechanism, and realizes the detachable fixation between the drill bit and the inner cylinder through a fixing structure, thus achieving the technical effect of easy disassembly of the drill tool.

[0008] Optionally, the fixing mechanism includes a connecting cylinder fixed to one end of the inner cylinder facing the drill bit mechanism; the connecting cylinder is provided with a right-angle plate facing the drill bit mechanism, the right-angle plate includes a vertical section and a parallel section integrally connected vertically, the vertical section is fixedly connected to the side wall of the connecting cylinder, and the parallel section is arranged parallel to the axis of the connecting cylinder; A receiving cavity is provided in the parallel section, and a through hole is provided through the parallel section in the direction parallel to the vertical section. A movable plate is slidably provided in the receiving cavity. A wedge-shaped block is provided on the movable plate facing the connecting cylinder. A movable block is provided on the side of the movable plate away from the wedge block. The movable block and the wedge block are both slidably connected in the through hole. The movable plate is provided with telescopic springs on both sides of the movable block. One end of the telescopic spring abuts against the movable plate, and the other end of the telescopic spring abuts against the inner wall of the receiving cavity. The drill bit mechanism includes a mounting cylinder coaxial with the inner cylinder. The mounting cylinder is slidably sleeved on the outer wall of the connecting cylinder, and a connecting plate is fixedly provided on the outer wall of the mounting cylinder at the position opposite to the parallel section. The connecting plate is provided with a wedge-shaped hole that engages with the wedge-shaped block. The drill bit body is provided at the end of the mounting cylinder opposite to the inner cylinder.

[0009] Furthermore, an unlocking mechanism is provided at one end of the parallel section facing the drill bit body. The unlocking mechanism includes a horizontal plate that penetrates the side wall of the parallel section facing the drill bit body. The moving block is provided with a triangular hole for the horizontal plate to be inserted into, and a push block is provided on the horizontal plate facing the triangular hole. The push block is slidably connected to the triangular hole. A push plate is fixedly installed on the end of the horizontal plate away from the triangular hole.

[0010] Furthermore, the heat dissipation mechanism includes a heat dissipation cavity disposed within the inner cylinder, a U-shaped frame movably installed within the heat dissipation cavity, a box movably installed within the U-shaped frame, a pump body installed on the side of the box facing the drill bit body, a water supply pipe connected to the inlet of the pump body and communicating with the interior of the box, and a diversion pipe connected to the outlet of the pump body, the diversion pipe being T-shaped, and nozzles connected to the two symmetrical free ends of the diversion pipe, the nozzles being disposed through the side wall of the inner cylinder, and the spraying direction of the nozzles being directed towards the drill bit body; The side wall of the box is equipped with a liquid inlet pipe.

[0011] Furthermore, a locking assembly is provided at one end of the U-shaped frame facing the drill bit body. The locking assembly includes a vertical plate fixedly connected to the inner wall of the U-shaped frame, and locking plates are respectively provided at both ends of the vertical plate facing the inner side wall of the inner cylinder. The vertical plate has two mounting cavities at the ends corresponding to the two clamping plates. Each mounting cavity can be slidably fitted with a pressing plate. Each clamping plate passes through the corresponding mounting cavity and is fixedly connected to the corresponding pressing plate. The vertical plate has an opening at one end facing the drill bit body. The pressing plate extends through the opening to the outside of the vertical plate, and the pressing plate can slide in the direction of the other pressing plate within the corresponding opening. Each of the two pressing plates is fixedly connected to a fixing spring on one side of the opposite side. One end of the fixing spring is fixedly connected to the pressing plate, and the other end of the pressing plate is fixedly connected to the inner wall of the corresponding mounting cavity.

[0012] Furthermore, the inner wall of the inner cylinder is provided with a slot for engaging with the card plate.

[0013] Furthermore, each of the right-angle plates has multiple inner telescopic springs, and the horizontal plate is disposed through the space between adjacent telescopic springs; A sponge pad is provided on the side of the push plate opposite to the parallel section.

[0014] Furthermore, a stabilizing frame is provided inside the housing and is slidably connected to the inner cylinder. The stabilizing frame is provided with a through hole through which the inner cylinder slides.

[0015] Furthermore, the outer layer of the mounting cylinder is made of high-strength alloy steel, the inner layer is made of flexible conformal material, and a buffer medium, which is gas, is filled between the inner and outer layers.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 is a three-dimensional structural view of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention; Figure 2 is a left perspective view of the structure of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention; Figure 3 is a partial sectional perspective view of a conformal sampling drill tool suitable for soft coal seams according to the present invention. Figure 4 is a cross-sectional perspective view of the fixing mechanism and drill bit mechanism of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention. Figure 5 is an exploded view of the connection between the fixing mechanism and the drill bit mechanism of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention. Figure 6 is a partial sectional perspective view of the fixing mechanism of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention; Figure 7 is one of the cross-sectional perspective views of the heat dissipation mechanism of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention; Figure 8 is a second sectional perspective view of the heat dissipation mechanism of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention; Figure 9 is a partial perspective view of the heat dissipation mechanism of an in-situ conformal sampling drill tool suitable for soft coal seams according to the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Shell; 2. Spiral drill rod assembly; 21. Inner cylinder; 22. Spiral blade; 3. Circular drill rod; 4. Fixing mechanism; 401. Connecting cylinder; 402. Right angle plate; 403. Through hole; 404. Moving block; 405. Triangular hole; 406. Moving plate; 407. Telescopic spring; 408. Wedge block; 409. Horizontal plate; 410. Push block; 411. Push plate; 5. Drill bit mechanism; 51. Mounting cylinder; 52. Connecting plate; 53. Drill bit body; 6. Heat dissipation mechanism; 601. Nozzle; 602. U-shaped frame; 603. Box; 604. Pump body; 605. Water inlet pipe; 606. Diverter pipe; 607. Liquid inlet pipe body; 608. Vertical plate; 609. Mounting cavity; 610. Pressing plate; 611. Clamping plate; 612. Fixing spring; 7. Stabilizing frame. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] This invention proposes an in-situ conformal sampling drill tool suitable for soft coal seams, as described below. Figures 1 to 9 Please provide a detailed explanation.

[0021] A conformal sampling drill tool suitable for soft coal seams includes a shell 1 that extends through both ends. A spiral drill rod assembly 2 is installed through the shell 1. The spiral drill rod assembly 2 includes an inner cylinder 21 that extends through the shell 1. A drill bit mechanism 5 is detachably installed at one end of the inner cylinder 21, and a round drill rod 3 is installed at the other end of the inner cylinder 21. The inner cylinder 21 is provided with a heat dissipation mechanism 6 for dissipating heat from the drill bit mechanism 5 at the end facing the drill bit mechanism 5; A fixing mechanism 4 is provided between the drill bit mechanism 5 and the inner cylinder 21.

[0022] The present invention achieves heat dissipation of the drill bit mechanism 5 by setting up a heat dissipation mechanism 6, and achieves detachable fixation between the drill bit and the inner cylinder 21 by using a fixing structure, thus realizing the technical effect of easy disassembly of the drill bit.

[0023] In some embodiments, the fixing mechanism 4 includes a connecting cylinder 401 fixed to one end of the inner cylinder 21 facing the drill bit mechanism 5; the connecting cylinder 401 is provided with a right angle plate 402 in the direction of the drill bit mechanism 5, the right angle plate 402 includes a vertical section and a parallel section integrally connected vertically, the vertical section is fixedly connected to the side wall of the connecting cylinder 401, and the parallel section is arranged parallel to the axis of the connecting cylinder 401. A receiving cavity is provided in the parallel section. A through hole 403 is provided through the parallel section along the direction of the parallel-vertical section. A movable plate 406 is slidably provided in the receiving cavity. A wedge block 408 is provided on the movable plate 406 facing the connecting cylinder 401. A movable block 404 is provided on the side of the movable plate 406 away from the wedge block 408. The movable block 404 and the wedge block 408 are both slidably connected in the through hole 403. The movable plate 406 is provided with telescopic springs 407 on both sides of the movable block 404. One end of the telescopic spring 407 abuts against the movable plate 406, and the other end of the telescopic spring 407 abuts against the inner wall of the receiving cavity. The drill bit mechanism 5 includes an installation cylinder 51 coaxial with the inner cylinder 21. The installation cylinder 51 is slidably sleeved on the outer wall of the connecting cylinder 401, and a connecting plate 52 is fixedly provided on the outer wall of the installation cylinder 51 at the position opposite to the parallel section. The connecting plate 52 is provided with a wedge-shaped hole that engages with the wedge block 408. The drill bit body 53 is provided at the end of the mounting cylinder 51 opposite to the inner cylinder 21.

[0024] Specifically, by designing the right-angle plate 402 as an integrated structure of vertical and parallel sections, the vertical section provides stable radial support, while the parallel section provides precise axial guidance, ensuring the overall rigidity of the fixing mechanism 4 on the connecting cylinder 401. When the mounting cylinder 51 is fitted into the connecting cylinder 401, the connecting plate 52 pushes against the inclined surface of the wedge block 408, forcing the moving plate 406 to compress the telescopic spring 407 and retract into the through hole 403. Once the wedge hole on the connecting plate 52 is aligned with the wedge block 408, The telescopic spring 407 releases its elastic potential energy to automatically eject the moving plate 406 and wedge block 408 and lock them into the wedge hole, achieving automatic locking and installation of the drill bit mechanism 5 without any auxiliary tools or rotational movements. The telescopic springs 407, symmetrically arranged on both sides, apply force simultaneously from both sides of the moving block 404, ensuring that the moving plate 406 is subjected to absolutely vertical and balanced force during reciprocating sliding, preventing the moving plate 406 from getting stuck in the through hole 403 due to unilateral load, and greatly improving the reliability of locking and releasing actions. At the same time, the connecting cylinder 401 extends to the right side of the inner cylinder 21 and provides a fitting reference surface for the mounting cylinder 51, so that the drill bit mechanism 5 maintains precise coaxiality with the inner cylinder 21 after installation, avoiding radial runout during drilling.

[0025] In some embodiments, an unlocking mechanism is provided at one end of the parallel section facing the drill bit body 53. The unlocking mechanism includes a horizontal plate 409 that passes through the side wall of the parallel section facing the drill bit body 53. A moving block 404 is provided with a triangular hole 405 for the horizontal plate 409 to be inserted into in the direction of the horizontal plate 409. A push block 410 is provided in the direction of the horizontal plate 409 facing the triangular hole 405. The push block 410 is slidably connected to the triangular hole 405. A push plate 411 is fixedly installed at one end of the horizontal plate 409 away from the triangular hole 405.

[0026] Specifically, when the drill bit needs to be disassembled for maintenance or replacement, the operator can easily reach the push plate 411 at the front end of the drill bit and push it inward, without having to go around to the complex rear of the drill bit or use special long-handled tools, which significantly improves the convenience and efficiency of maintenance operations. When the horizontal plate 409 moves inward, it drives the push block 410 to move synchronously. The inclined surface of the push block 410 slides and squeezes against the inclined wall of the triangular hole 405, accurately converting the axial horizontal thrust into a radial vertical lifting force. This forces the moving block 404, together with the moving plate 406 and the wedge block 408, to retract in the direction that overcomes the elastic force of the telescopic spring 407. As the push block 410 continues to be pushed in, the wedge block 408 completely exits the wedge hole of the connecting plate 52, the locking state is smoothly released, and the drill bit mechanism 5 can then be smoothly disengaged axially. During this process, the inclined plane transmission mechanism amplifies and redirects the force, allowing the operator to overcome the large spring locking force with only a small pushing force. The disassembly process is labor-saving and smooth, effectively avoiding damage to the precision mating surfaces caused by strong prying or hammering.

[0027] In some embodiments, the heat dissipation mechanism 6 includes a heat dissipation cavity disposed within the inner cylinder 21, a U-shaped frame 602 movably installed within the heat dissipation cavity, a housing 603 movably installed within the U-shaped frame 602, a pump body 604 installed on the side of the housing 603 facing the drill bit body 53, the inlet of the pump body 604 being connected to a water supply pipe communicating with the interior of the housing 603, and the outlet of the pump body 604 being connected to a diversion pipe 606, the diversion pipe 606 being T-shaped, and the two symmetrical free ends of the diversion pipe 606 being connected to nozzles 601, the nozzles 601 being disposed through the side wall of the inner cylinder 21, and the spraying direction of the nozzles 601 being disposed towards the drill bit body 53; An inlet pipe 607 is provided on the side wall of the housing 603.

[0028] Specifically, the pump body 604 draws coolant directly from the adjacent housing 603 via a water supply pipe. This short flow path effectively reduces pressure loss along the pipeline, ensuring sufficient injection pressure for the nozzles 601. Driven by the pump body 604, the coolant enters the T-shaped split pipe 606 and is divided into two parts, which are then delivered to two symmetrically arranged nozzles 601, achieving balanced coolant supply from both nozzles 601. The two nozzles 601 simultaneously spray coolant towards the drill bit body 53 from both symmetrical sides, forming a fully enclosed water mist coverage. This avoids cooling blind spots and thermal stress concentration caused by single-sided spraying, significantly improving heat dissipation efficiency and cooling speed. The nozzles 601 penetrate the side wall of the inner cylinder 21 and directly face the drill bit body 53, allowing the coolant to reach the drill bit surface within a very short flight distance. This reduces coolant dispersion and temperature rise in the air, resulting in a short spray stroke and strong targeting. The housing 603, pump body 604, diversion pipe 606 and nozzle 601 are all integrated and installed on the U-shaped frame 602, forming a compact functional unit that is easy to pull out for maintenance or replacement.

[0029] In some embodiments, a locking component is provided at one end of the U-shaped frame 602 facing the drill bit body 53. The locking component includes a vertical plate 608 fixedly connected to the inner wall of the U-shaped frame 602, and locking plates 611 are respectively provided at both ends of the vertical plate 608 facing the inner side wall of the inner cylinder 21. The upright plate 608 has two mounting cavities 609 at the ends corresponding to the two clamping plates 611. Each mounting cavity 609 can be slidably provided with a pressing plate 610. Each clamping plate 611 passes through the corresponding mounting cavity 609 and is fixedly connected to the corresponding pressing plate 610. The upright plate 608 has an opening at the end facing the drill bit body 53. The pressing plate 610 passes through the opening and extends to the outside of the upright plate 608. The pressing plate 610 can slide in the corresponding opening towards the other pressing plate 610. Each of the two pressing plates 610 is fixedly connected to a fixing spring 612 on one side of the opposite side. One end of the fixing spring 612 is fixedly connected to the pressing plate 610, and the other end of the pressing plate 610 is fixedly connected to the inner wall of the corresponding mounting cavity 609.

[0030] Specifically, under normal drilling conditions, the fixed spring 612, with its own rigidity, firmly pushes the pressing plate 610 and the clamping plate 611 outward. The clamping plate 611 is stably embedded in the groove on the side wall of the inner cylinder 21, so that the entire heat dissipation mechanism 6 can maintain rigid locking with the inner cylinder 21 even under strong torsional vibration and axial impact of the drill bit, eliminating the hidden danger of jumping, moving or abnormal noise of the internal components of the heat dissipation cavity. When it is necessary to add coolant or maintain the heat dissipation mechanism 6, the operator inserts two fingers to squeeze the two pressing plates 610 at the same time. The two pressing plates 610 slide precisely inward towards each other under the guidance of the opening, causing the clamping plates 611 on both sides to retract synchronously and disengage from the groove of the inner cylinder 21. The entire U-shaped frame 602, together with the box 603 and the pump body 604, is unlocked and can be smoothly pulled outward along the axial direction of the inner cylinder 21. In other words, the two pressing plates 610 are unlocked by pinching them together with two fingers, and the entire component is pulled out by pulling it out with one hand. This simplifies the complex disassembly of multiple components into two steps, significantly reducing the maintenance difficulty and operation time in the confined space downhole.

[0031] In some embodiments, the inner wall of the inner cylinder 21 is provided with a slot for engaging with the locking plate 611. The slot provides a defined locking position and a load-bearing groove for the locking plate 611, allowing the operator to receive clear tactile feedback when the heat dissipation mechanism 6 is installed correctly, thus avoiding abnormal vibrations caused by improper installation. The positive pressure between the slot and the locking plate 611 is constantly maintained by the fixing spring 612, preventing the locking plate 611 from slipping out of the slot under drilling vibration conditions, achieving tool-free self-locking assembly without the need for additional locking screws or pins.

[0032] In some embodiments, the number of inner telescopic springs 407 of each right-angle plate 402 is multiple, and the horizontal plate 409 is disposed through the space between adjacent telescopic springs 407. A sponge pad is provided on the side of the push plate 411 that is away from the parallel section.

[0033] Specifically, multiple sets of telescopic springs 407 are arranged in parallel. Even if one spring fatigues or fails unexpectedly, the remaining springs can still provide sufficient locking force redundancy to ensure that the wedge block 408 is firmly locked in the locked position, preventing the drill bit mechanism 5 from accidentally loosening during drilling. The cross plate 409 passes through the gap between adjacent telescopic springs 407, ensuring that the travel of the cross plate 409 is not interfered with by the springs, and making the overall structure of the fixing mechanism 4 compact, without increasing the radial dimension due to the addition of the unlocking mechanism. The sponge pad increases the contact area and cushioning when the fingers push the push plate 411, improving operating comfort and anti-slip properties.

[0034] In some embodiments, a stabilizing frame 7 is provided inside the housing 1 and slidably connected to the inner cylinder 21. The stabilizing frame 7 has a through hole through which the inner cylinder 21 slides. The stabilizing frame 7 transforms the cantilever section of the inner cylinder 21 into a simply supported structure, significantly shortening the effective support span of the inner cylinder 21. This significantly increases the critical speed of the inner cylinder 21 during high-speed rotation, effectively avoiding the operating speed range and fundamentally suppressing the severe vibration caused by resonance. Through the strict constraint of the radial displacement of the inner cylinder 21 by the through hole 403 of the stabilizing frame 7, the bending deformation of the inner cylinder 21 when transmitting large torque is limited to a very small range, ensuring the dynamic coaxiality between the inner cylinder 21 and the housing 1, reducing the alternating stress on the housing 1 caused by eccentric rotation, and significantly extending the service life of the housing 1 and the bearings.

[0035] In some embodiments, the inner cylinder 21 is provided with spiral blades 22 for slag discharge on its circumference. By providing spiral blades 22 on the circumference of the inner cylinder 21, the rotational power of the inner cylinder 21 directly drives the spiral blades 22 to rotate synchronously, forming a continuous spiral slag discharge channel in the annular region between the borehole wall and the outer wall of the inner cylinder 21. Under the axial thrust of the working surface of the spiral blades 22, the slag is transported at a near-constant speed along the spiral grooves of the spiral blades 22 in a direction away from the drill bit, avoiding the accumulation of slag at the bottom of the borehole and eliminating the risk of borehole collapse caused by slag accumulation at the source.

[0036] In some embodiments, the outer layer of the mounting cylinder 51 is made of high-strength alloy steel, the inner layer is made of flexible conformal material, and a buffer medium, which is gas, is filled between the inner and outer layers. The flexible inner layer absorbs drilling impacts, reduces sample breakage, and thus ensures the in-situ conformity preservation of the soft coal seam during drilling. During drilling, when the severe circumferential and axial impact forces generated by the drill bit breaking the coal seam are transmitted to the buffer gas layer through the outer high-strength alloy steel layer, the gas, with its excellent compressibility, converts the rigid impact energy into its own compressive internal energy, achieving the first level of effective buffer attenuation. When the residual gentle pressure wave continues to be transmitted to the inner flexible conformal material, the flexible material further absorbs and dissipates vibration energy through its own elastic deformation, achieving the second level of attenuation protection. After double buffering, the mechanical disturbance ultimately transmitted to the coal core is reduced to an extremely low level, and the original bedding, fractures, and water saturation of the coal core are completely preserved, truly achieving the goal of high-fidelity sampling.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A drilling tool for in-situ conformal sampling in soft coal seams, characterized in that, The device includes a housing extending through both ends, and a spiral drill rod assembly is disposed through the housing. The spiral drill rod assembly includes an inner cylinder extending through the housing. A drill bit mechanism is detachably disposed at one end of the inner cylinder, and a round drill rod is disposed at the other end of the inner cylinder. The inner cylinder is provided with a heat dissipation mechanism for dissipating heat from the drill bit mechanism at the end facing the drill bit mechanism. A fixing mechanism is provided between the drill bit mechanism and the inner cylinder.

2. The in-situ conformal sampling drill tool for soft coal seams as described in claim 1, characterized in that, The fixing mechanism includes a connecting cylinder fixed to one end of the inner cylinder facing the drill bit mechanism; the connecting cylinder is provided with a right-angle plate facing the drill bit mechanism, the right-angle plate includes a vertical section and a parallel section integrally connected vertically, the vertical section is fixedly connected to the side wall of the connecting cylinder, and the parallel section is arranged parallel to the axis of the connecting cylinder; A receiving cavity is provided in the parallel section, and a through hole is provided through the parallel section in the direction parallel to the vertical section. A movable plate is slidably provided in the receiving cavity. A wedge-shaped block is provided on the movable plate facing the connecting cylinder. A movable block is provided on the side of the movable plate away from the wedge block. The movable block and the wedge block are both slidably connected in the through hole. The movable plate is provided with telescopic springs on both sides of the movable block. One end of the telescopic spring abuts against the movable plate, and the other end of the telescopic spring abuts against the inner wall of the receiving cavity. The drill bit mechanism includes a mounting cylinder coaxial with the inner cylinder. The mounting cylinder is slidably sleeved on the outer wall of the connecting cylinder, and a connecting plate is fixedly provided on the outer wall of the mounting cylinder at the position opposite to the parallel section. The connecting plate is provided with a wedge-shaped hole that engages with the wedge-shaped block. The drill bit body is provided at the end of the mounting cylinder opposite to the inner cylinder.

3. The in-situ conformal sampling drill tool for soft coal seams as described in claim 2, characterized in that, The parallel section is provided with an unlocking mechanism at one end facing the drill bit body. The unlocking mechanism includes a horizontal plate that passes through the side wall of the parallel section facing the drill bit body. The moving block is provided with a triangular hole for the horizontal plate to be inserted into, and the horizontal plate is provided with a push block facing the triangular hole. The push block is slidably connected to the triangular hole. A push plate is fixedly installed on the end of the horizontal plate away from the triangular hole.

4. The in-situ conformal sampling drill tool for soft coal seams according to claim 1, characterized in that, The heat dissipation mechanism includes a heat dissipation cavity disposed within the inner cylinder, a U-shaped frame movably installed within the heat dissipation cavity, a box movably installed within the U-shaped frame, a pump body installed on the side of the box facing the drill bit body, a water supply pipe connected to the inlet of the pump body and communicating with the interior of the box, and a diversion pipe connected to the outlet of the pump body, the diversion pipe being T-shaped, and nozzles connected to the two symmetrical free ends of the diversion pipe, the nozzles being disposed through the side wall of the inner cylinder, and the spraying direction of the nozzles being directed towards the drill bit body; The side wall of the box is equipped with a liquid inlet pipe.

5. The in-situ conformal sampling drill tool for soft coal seams as described in claim 4, characterized in that, The U-shaped frame is provided with a locking component at one end facing the drill bit body. The locking component includes a vertical plate fixedly connected to the inner wall of the U-shaped frame, and locking plates are respectively provided through the two ends of the vertical plate facing the inner side wall of the inner cylinder. The vertical plate has two mounting cavities at the ends corresponding to the two clamping plates. Each mounting cavity can be slidably fitted with a pressing plate. Each clamping plate passes through the corresponding mounting cavity and is fixedly connected to the corresponding pressing plate. The vertical plate has an opening at one end facing the drill bit body. The pressing plate extends through the opening to the outside of the vertical plate, and the pressing plate can slide in the direction of the other pressing plate within the corresponding opening. Each of the two pressing plates is fixedly connected to a fixing spring on one side of the opposite side. One end of the fixing spring is fixedly connected to the pressing plate, and the other end of the pressing plate is fixedly connected to the inner wall of the corresponding mounting cavity.

6. The in-situ conformal sampling drill tool for soft coal seams as described in claim 1, characterized in that, The inner wall of the inner cylinder is provided with a slot for engaging with the card plate.

7. The in-situ conformal sampling drill tool for soft coal seams as described in claim 1, characterized in that, The number of inner telescopic springs on each of the right-angle plates is multiple, and the horizontal plate is disposed through the space between adjacent telescopic springs; A sponge pad is provided on the side of the push plate opposite to the parallel section.

8. The in-situ conformal sampling drill tool for soft coal seams as described in claim 1, characterized in that, The housing is provided with a stabilizing frame that is slidably connected to the inner cylinder, and the stabilizing frame is provided with a through hole through which the inner cylinder slides.

9. A conformal sampling drill tool for soft coal seams as described in claim 2, characterized in that, The outer layer of the mounting cylinder is made of high-strength alloy steel, the inner layer is made of flexible conformal material, and a buffer medium, which is gas, is filled between the inner and outer layers.

10. The in-situ conformal sampling drill tool for soft coal seams as described in claim 1, characterized in that, Spiral blades for slag discharge are provided around the inner cylinder.

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