A rotary coring device for two-inch cores

Abstract

This invention discloses a rotary coring device for two-inch core samples, solving technical problems such as the difficulty in smooth drilling of the drill bit assembly and insufficient propulsion force. The device includes a main body, a pusher arm, and a drilling mechanism. The drilling mechanism includes a receiving frame, a support, a drill bit assembly, and a drive sleeve. The drill bit assembly is equipped with two drive columns, and the support is equipped with a drive block. The drive sleeve has two first drive holes and two second drive holes. The first drive holes include an arc-shaped hole and a first inclined hole, and the second drive holes include a horizontal hole and a second inclined hole. The drill bit assembly can rotate under the action of the drive columns and the arc-shaped holes, and move towards the well wall under the action of the two drive columns, the first inclined holes, the drive blocks, and the second inclined holes. This invention can realize the sampling operation of two-inch core samples, and the propulsion force can be applied evenly to the drill bit assembly, ensuring smooth drilling.

Description

Technical Field

[0001] This invention belongs to the field of core sampling technology, specifically relating to a rotary core sampling device for two-inch core samples. Background Technology

[0002] Core sampling tools are specialized tools used during drilling to extract blocks of underground rock to the surface. They are a common type of geological exploration equipment used to obtain wellbore rock samples with a diameter of 1-1.5 inches.

[0003] Chinese patent CN113494257B discloses an integrated core sampling sub, which includes an integrally formed base, and a probe module, a core sampling module, and a hydraulic module mounted on the base. The core sampling module includes a drill bit assembly, a sliding plate, a drive protrusion, and an opening slot. During the sliding of the sliding plate, the drive protrusion drives the drill bit assembly to rotate to face the well wall under the action of the opening slot. As the sliding plate continues to move, the drive protrusion drives the drill bit assembly to move towards the well wall under the action of the opening slot. In conjunction with the rotation of the drill bit assembly, drilling operation is achieved.

[0004] However, in the aforementioned related technologies, the drill bit's propulsion action is unbalanced because the drive lead and slot are located on one side of the drill bit assembly, meaning the propulsive force acts on only one side. This imbalance causes the drill bit assembly to wobble as it drills towards the wellbore, affecting core sampling. Furthermore, for two-inch core sampling, the increased size of the sampling drill bit necessitates an increase in the drilling force required by the drill bit assembly, meaning the hydraulic force on the sliding plate needs to be increased. However, in the aforementioned related technologies, the hydraulic force is entirely converted into propulsive force by a single drive lead and slot, making it difficult for components like the sliding plate to withstand the large hydraulic forces. Therefore, this approach is unsuitable for two-inch core sampling operations and requires improvement. Summary of the Invention

[0005] In order to solve all or part of the above problems, the present invention aims to provide a rotary coring device for two-inch core samples, which can realize the sampling operation of two-inch core samples, and the propulsion force can be balanced on the drill bit assembly to ensure the smooth drilling of the drill bit assembly, thereby ensuring the smooth operation of the sampling operation.

[0006] This invention provides a rotary coring device for two-inch core samples, comprising an instrument body, a push arm, and a drilling mechanism, wherein the drilling mechanism includes:

[0007] The receiving frame is connected to the main body of the instrument;

[0008] The support part is slidably connected to the receiving frame along the radial direction of the instrument body;

[0009] The drill bit assembly is rotatably connected to the support portion;

[0010] The drive sleeve is slidably connected to the instrument body along the axial direction of the instrument body;

[0011] Two drive columns are provided and symmetrically fixed to both sides of the drill bit assembly;

[0012] Two first drive holes are provided and symmetrically arranged on the drive sleeve, and the two drive pins are respectively slidably engaged with the corresponding first drive holes;

[0013] Two drive blocks are provided and symmetrically fixed on both sides of the support portion;

[0014] Two second drive holes are provided and symmetrically arranged on the drive sleeve, and the two drive blocks respectively slide in cooperation with the corresponding second drive holes;

[0015] Each of the first driving holes includes an interconnected arc hole and a first inclined hole, and each of the second driving holes includes an interconnected horizontal hole and a second inclined hole, with the first inclined hole and the second inclined hole being parallel to each other.

[0016] The drill bit assembly can be flipped under the action of the two drive columns and the arc hole. When the drive column enters the first inclined hole, the drive block enters the second inclined hole simultaneously, so that the drill bit assembly can move toward the well wall under the combined action of the two drive columns, the first inclined hole, the drive block and the second inclined hole.

[0017] The positions of the drive blocks and drive columns are configured such that when the drill bit assembly is flipped to align with the well wall, the drill bit of the drill bit assembly is located at the center of the two drive blocks and the two drive columns.

[0018] Optionally, the drive block is provided with a guide slope on the side facing the second inclined hole. When the drive sleeve slides and the drive column enters the first inclined hole, the guide slope abuts against the corresponding inner wall of the second inclined hole, so that when the drive sleeve continues to slide, the drive block can slide along the second inclined hole and the drive column can smoothly enter the first inclined hole, so that the drill bit assembly can smoothly move toward the well wall.

[0019] Optionally, the side wall of the drive block is provided with a positioning slope, which is parallel to the guide slope, and the length of the guide slope is greater than the length of the positioning slope. When the guide slope abuts against the inner wall of one side of the second inclined hole, the positioning slope is flush with the inner wall of the other side of the second inclined hole, so that the drive block can slide smoothly along the second inclined hole.

[0020] Optionally, the sidewall of the drive block is symmetrically provided with two guide planes, and the two guide planes cooperate with the inner walls on both sides of the horizontal hole to achieve the guiding effect on the drive sleeve.

[0021] Optionally, the sidewall of the drive block is symmetrically provided with two limiting inclined surfaces. When the guide inclined surface abuts against the corresponding inner wall of the second inclined hole, the two limiting inclined surfaces are respectively flush with the corresponding inner wall of the first inclined hole, so that the drive column can slide smoothly along the first inclined hole.

[0022] Optionally, the drive sleeve is provided with four mud holes, two of which are located at the intersection of the arc hole and the first inclined hole at the inner corner, and the other two mud holes are located at the intersection of the horizontal hole and the corresponding second inclined hole at the inner corner.

[0023] Optionally, the support includes two parallel support plates, the drill bit assembly is located between the two support plates and is rotatably connected to the two support plates by pins, and guide blocks are fixedly connected to the sides of the two support plates that are far apart from each other. The receiving frame is provided with two guide grooves, and the two guide blocks are slidably connected to the corresponding guide grooves.

[0024] Optionally, the two support plates are connected by a support bridge, and the two ends of the support bridge are respectively slidably engaged with the corresponding guide grooves.

[0025] Optionally, the drill bit assembly includes a drive motor, a reducer, and a sampling drill bit connected in sequence, the sampling drill bit being perpendicular to the drive motor, and the reducer being rotatably connected to the support portion.

[0026] Optionally, the core extraction device further includes a pair of hydraulically telescopic release arms, the release arms and the push arm being distributed on both sides of the instrument body, and the release arms being able to push the instrument body in the opposite direction to release the jam.

[0027] As can be seen from the above technical solution, the rotary coring device for two-inch cores provided by the present invention has the following advantages:

[0028] In this device, the thrust generated by the interaction between the drive column and the first inclined hole acts on the drilling assembly, while the thrust generated by the interaction between the drive block and the second inclined hole acts on the support. Since the sampling drill bit of the drill bit assembly is located in the central area of ​​the two drive blocks and two drive columns, the thrust can be applied to the drill bit assembly in a relatively balanced manner, allowing the drill bit assembly to move more smoothly towards the well wall, thus enabling the coring device to perform sampling operations smoothly. Simultaneously, the device can withstand significant hydraulic forces, providing sufficient thrust to the drill bit assembly to ensure smooth drilling into the well wall, enabling the coring device to successfully sample two-inch cores.

[0029] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0030] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0032] Figure 2 This is a side view of the drilling mechanism in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the drilling mechanism in an embodiment of the present invention, showing the support part and other structures;

[0034] Figure 4 This is a schematic diagram of the drilling mechanism in an embodiment of the present invention, showing structures such as the drive sleeve;

[0035] Figure 5 for Figure 3 Enlarged view of region A in the middle;

[0036] Figure 6 for Figure 4 Enlarged view of region B in the middle;

[0037] Figure 7 This is a top view of the drilling mechanism in an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Instrument body; 2. Push arm; 3. Drilling mechanism; 31. Receiving frame; 32. Support part; 321. Support plate; 322. Guide block; 323. Guide groove; 324. Support bridge; 33. Drill bit assembly; 331. Drive motor; 332. Reducer; 333. Sampling drill bit; 334. Pin; 34. Drive sleeve; 35. Drive column; 36. First drive hole; 361. Arc hole; 362. First inclined hole; 37. Drive block; 38. Second drive hole; 381. Horizontal hole; 382. Second inclined hole; 4. Guide slope; 5. Positioning slope; 6. Guide plane; 7. Limiting slope; 8. Mud hole; 9. Unjamming arm. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.

[0041] like Figures 1-7 The following is an embodiment of the present invention, which discloses a rotary coring device for two-inch core samples. The device includes an instrument body 1, a drilling mechanism 3, and two push arms 2 on one side of the instrument body 1. When the two push arms 2 are opened, the instrument body 1 can be pressed against the well wall. At this time, the drilling mechanism 3 can perform core sampling on the side of the well wall away from the push arms 2.

[0042] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the drilling mechanism 3 includes a support frame 31 fixedly connected to the instrument body 1, a support part 32 slidably connected to the support frame 31, and the support part 32 slides radially along the instrument body 1. At the same time, a drill bit assembly 33 is rotatably connected to the support part 32.

[0043] In one embodiment, such as Figure 2 As shown, the drill assembly 33 includes a drive motor 331, a reducer 332 and a sampling drill bit 333 connected in sequence. The sampling drill bit 333 is perpendicular to the drive motor 331. Pins 334 are symmetrically fixedly connected to both sides of the reducer 332. The two pins 334 are coaxial and rotatably connected to the support part 32 respectively.

[0044] Since the reducer 332 is located in the middle, the pin 334 is set on the reducer 332, which can reduce the rotation radius of the drill bit assembly 33, so as to facilitate the arrangement of the drilling mechanism 3 and make the diameter of the instrument body 1 as small as possible, so that the coring device can be lowered into a smaller well.

[0045] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, a drive sleeve 34 is slidably connected to the instrument body 1, and the hydraulic control mechanism on the instrument body 1 can control the drive sleeve 34 to slide along the axial direction of the instrument body 1. Drive columns 35 are fixedly connected to both side walls of the reducer 332, and the two drive columns 35 are symmetrically distributed. Two first drive holes 36 are symmetrically opened on the drive sleeve 34, and the two drive columns 35 are slidably engaged with the corresponding first drive holes 36. Drive blocks 37 are fixedly connected to both side walls of the support part 32, and the two drive blocks 37 are symmetrically distributed. Two second drive holes 38 are symmetrically opened on the drive sleeve 34, and the two drive blocks 37 are slidably engaged with the corresponding second drive holes 38.

[0046] In one embodiment, when the drill bit assembly 33 is flipped to align with the well wall, the sampling drill bit 333 of the drill bit assembly 33 is located at the center of the two drive blocks 37 and the two drive columns 35, so that the propulsion force can be applied to the drill bit assembly 33 in a more balanced manner, so that the drill bit assembly 33 can move smoothly toward the well wall.

[0047] In one embodiment, such as Figure 5 , Figure 6 As shown, each first driving hole 36 includes an interconnected arc hole 361 and a first inclined hole 362, and each second driving hole 38 includes an interconnected horizontal hole 381 and a second inclined hole 382, ​​with the first inclined hole 362 and the second inclined hole 382 being parallel.

[0048] As the drive sleeve 34 slides downward, the drill bit assembly 33 rotates under the action of the two drive pins 35 and the arc-shaped hole 361. When the sampling drill bit 333 is aligned with the well wall, the drive pins 35 enter the first inclined hole 362, and the drive block 37 enters the second inclined hole 382. As the drive sleeve 34 continues to slide downward, the drill bit assembly 33 moves towards the well wall under the combined action of the two drive pins 35, the first inclined hole 362, the drive block 37, and the second inclined hole 382. At this time, in conjunction with the rotation of the sampling drill bit 333, the drilling operation can be completed.

[0049] In this embodiment, the core sampling device utilizes a drive column 35 and a first inclined hole 362 to generate thrust on the drilling assembly, while the drive block 37 and a second inclined hole 382 generate thrust on the support 32. Since the sampling drill bit 333 of the drill bit assembly 33 is located at the center of the two drive blocks 37 and the two drive columns 35, the thrust can be applied to the drill bit assembly 33 in a relatively balanced manner. In other words, the support 32 and the drill bit assembly 33 are considered as a single structure, with the thrust acting at the four corners of this structure and the sampling drill bit 333 located at the center. This balanced thrust allows the drill bit assembly 33 to move more smoothly towards the wellbore, enabling the core sampling device to perform sampling operations smoothly. Furthermore, this device employs a "four-point propulsion" system, which can withstand significant hydraulic forces, providing sufficient thrust for the drill bit assembly 33 to successfully drill into the wellbore, allowing the core sampling device to successfully sample two-inch cores.

[0050] In one embodiment, such as Figure 5 , Figure 6 As shown, the drive block 37 has a guide slope 4 on the side facing the second inclined hole 382. When the drive sleeve 34 slides downward and the drive column 35 enters the first inclined hole 362, the guide slope 4 abuts against the corresponding inner wall of the second inclined hole 382. At this time, the sampling drill bit 333 is aligned with the well wall, and under the action of the guide slope 4 and the inner wall of the second inclined hole 382, ​​the drill bit cannot rotate during drilling, thus limiting the drill bit assembly 33. As the drive sleeve 34 continues to slide downward, the drive block 37 can slide along the second inclined hole 382 and allow the drive column 35 to smoothly enter the first inclined hole 362, so that the drill bit assembly 33 can smoothly move towards the well wall. This achieves a smooth connection between the drill bit's drilling and turning action and the drilling action, reducing the risk of the drill bit assembly 33 getting stuck.

[0051] In one embodiment, such as Figure 5 , Figure 6 As shown, the side wall of the drive block 37 is provided with a positioning inclined surface 5, which is parallel to the guide inclined surface 4, and the length of the guide inclined surface 4 is greater than the length of the positioning inclined surface 5. When the guide inclined surface 4 abuts against one side of the inner wall of the second inclined hole 382, ​​the positioning inclined surface 5 is flush with the other side of the inner wall of the second inclined hole 382. That is, when the drive block 37 slides along the second inclined hole 382, ​​the positioning inclined surface 5 and the guide inclined surface 4 abut against the corresponding inner walls of the second inclined hole 382 respectively, so as to limit the sliding trajectory of the drive block 37, thereby allowing the drive block 37 to slide smoothly along the second inclined hole 382.

[0052] In one embodiment, such as Figure 5 , Figure 6As shown, the side wall of the drive block 37 is symmetrically provided with two guide planes 6, and the two guide planes 6 cooperate with the inner walls of the horizontal hole 381 on both sides. When the drive sleeve 34 slides downward, the cooperation between the guide planes 6 and the horizontal hole 381 realizes the guiding effect on the drive sleeve 34, thereby improving the smoothness of the drive sleeve 34's movement.

[0053] In one embodiment, such as Figure 5 , Figure 6 As shown, the sidewall of the drive block 37 is symmetrically provided with two limiting inclined surfaces 7. When the guide inclined surface 4 abuts against the corresponding inner wall of the second inclined hole 382, ​​the two limiting inclined surfaces 7 are respectively flush with the corresponding inner wall of the first inclined hole 362. When the drive column 35 slides along the first inclined hole 362, the limiting inclined surfaces 7 and the corresponding inner walls of the first inclined hole 362 abut against each other to limit the sliding trajectory of the drive column 35, thereby allowing the drive column 35 to slide smoothly along the first inclined hole 362.

[0054] In one embodiment, such as Figure 6 As shown, the drive sleeve 34 is provided with four mud holes 8. Two mud holes 8 are located at the intersection of the inner corner of the arc hole 361 and the first inclined hole 362, and the other two mud holes 8 are located at the intersection of the inner corner of the horizontal hole 381 and the corresponding second inclined hole 382. In this embodiment, the "inner corner" refers to the state where the angle formed by the inner wall of the horizontal hole 381 and the inner wall of the second inclined hole 382 is inward, that is, concave inward. Conversely, if the other side protrudes outward, it is called the "outer corner".

[0055] This design reduces the risk of mud clogging, ensuring smooth sliding between the drive column 35 and the drive block 37 and minimizing the risk of jamming. Simultaneously, the mud hole 8 is located at the intersection of the inner corners, facilitating machining between the horizontal hole 381 and the second inclined hole 382 (the arc hole 361 and the first inclined hole 362) and providing sufficient margin for error. Furthermore, this design provides ample clearance for the movement of the drive block 37 and the drive column 35, ensuring they smoothly enter the corresponding inclined holes.

[0056] In one embodiment, such as Figure 3 , Figure 5 As shown, the support part 32 includes two parallel support plates 321, the drill bit assembly 33 is located between the two support plates 321, and two pins 334 on the reducer 332 are rotatably connected to the corresponding support plates 321. Meanwhile, guide blocks 322 are fixedly connected to the sides of the two support plates 321 that are far apart from each other, and the receiving frame 31 is provided with two guide grooves 323, with the two guide blocks 322 slidably connected to the corresponding guide grooves 323.

[0057] This design provides sufficient clearance for the arrangement of the drill bit assembly 33. Compared to existing drill bits that can only sample 1-1.5 inch cores, although the outer diameter of the drill bit in this application is increased, by optimizing the structure of the support 32, drive column 35, drive block 37, first drive hole 36 and second drive hole 38, the drill bit assembly 33 in this application can be arranged on the original instrument body 1. That is, although the diameter of the drill bit assembly 33 has increased, the overall diameter of the instrument body 1 has not increased significantly, so that the coring device can still be lowered into a smaller diameter hole.

[0058] In one embodiment, such as Figure 5 , Figure 7 As shown, two support plates 321 are connected by a support bridge 324, and both ends of the support bridge 324 are slidably engaged with corresponding guide grooves 323, so that the two support plates 321 can move synchronously. This not only improves the structural stability between the two support plates 321, but also ensures the smooth rotation and advancement of the drill bit assembly 33. At the same time, the two sides of the support bridge 324 are slidably engaged with corresponding guide grooves 323, providing a stable guiding force for the sliding of the support part 32, so that the drill bit assembly 33 can move smoothly toward the well wall.

[0059] In one embodiment, such as Figure 1 As shown, the coring device also includes a pair of hydraulically telescopic release arms 9. The release arms 9 and the push arm 2 are distributed on both sides of the instrument body 1, and the release arms 9 can push the instrument body 1 back to release it from the well. When the coring device completes sampling and the push arm 2 is retracted, the instrument body 1 is easily attracted to the well wall. At this time, the release arms 9 extend to push the instrument body 1 back, thereby smoothly separating the instrument body 1 from the well wall and ensuring the smooth recovery of the coring device.

[0060] As can be seen from the above, this device can be used to perform core sampling operations of two inches. At the same time, by optimizing the structure of the support part 32, drive column 35, drive block 37, first drive hole 36 and second drive hole 38 on the original 1-1.5 inch instrument body 1, the drill bit assembly 33 in this application can be arranged on the original instrument body 1. That is, although the diameter of the drill bit assembly 33 has increased, the overall diameter of the instrument body 1 has not increased significantly, so that the core sampling device can still be lowered into a hole with a smaller diameter.

[0061] Furthermore, the device employs a "four-point propulsion" system, which can withstand significant hydraulic pressure, providing sufficient propulsion force for the drill bit assembly 33. This allows the drill bit to smoothly penetrate the wellbore, enabling the coring device to successfully extract two-inch cores. Simultaneously, the "four-point propulsion" system ensures that the propulsion force is applied to the drill bit assembly 33 in a more balanced manner, allowing it to move more smoothly towards the wellbore and facilitating successful sampling operations.

[0062] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0063] Furthermore, the terms "first," "second," etc., 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. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rotary coring device for two-inch core samples, comprising an instrument body (1), a push arm (2), and a drilling mechanism (3), characterized in that, The drilling mechanism (3) includes: The receiving frame (31) is connected to the main body of the instrument (1); The support part (32) is slidably connected to the receiving frame (31) along the radial direction of the instrument body (1); The drill bit assembly (33) is rotatably connected to the support (32); Drive the sliding sleeve (34), which is slidably connected to the instrument body (1) along the axial direction of the instrument body (1); Two drive columns (35) are provided and symmetrically fixed on both sides of the drill bit assembly (33); Two first drive holes (36) are provided and symmetrically arranged on the drive sleeve (34), and the two drive pins (35) are respectively slidably engaged with the corresponding first drive holes (36); Two drive blocks (37) are provided and symmetrically fixed on both sides of the support (32); Two second drive holes (38) are provided and symmetrically arranged on the drive sleeve (34), and the two drive blocks (37) are respectively slidably engaged with the corresponding second drive holes (38); Each of the first driving holes (36) includes an arc hole (361) and a first inclined hole (362) that are connected to each other, and each of the second driving holes (38) includes a horizontal hole (381) and a second inclined hole (382) that are connected to each other, and the first inclined hole (362) and the second inclined hole (382) are parallel. The drill bit assembly (33) can be flipped under the action of the two drive columns (35) and the arc hole (361). When the drive column (35) enters the first inclined hole (362), the drive block (37) simultaneously enters the second inclined hole (382), so that the drill bit assembly (33) can move toward the well wall under the combined action of the two drive columns (35), the first inclined hole (362), the drive block (37) and the second inclined hole (382). The positions of the drive blocks (37) and drive columns (35) are set such that when the drill bit assembly (33) is flipped to align with the well wall, the drill bit of the drill bit assembly (33) is located at the center of the two drive blocks (37) and the two drive columns (35); The drive block (37) is provided with a guide slope (4) on the side facing the second inclined hole (382), and the side wall of the drive block (37) is provided with a positioning slope (5), which is parallel to the guide slope (4). The drive sleeve (34) is provided with four mud holes (8), two of which are located at the intersection of the arc hole (361) and the first inclined hole (362) at the inside corner, and the other two mud holes (8) are located at the intersection of the horizontal hole (381) and the corresponding second inclined hole (382) at the inside corner.

2. The core-collecting device according to claim 1, characterized in that, When the drive sleeve (34) slides and the drive column (35) enters the first inclined hole (362), the guide slope (4) abuts against the corresponding inner wall of the second inclined hole (382), so that when the drive sleeve (34) continues to slide, the drive block (37) can slide along the second inclined hole (382) and the drive column (35) can smoothly enter the first inclined hole (362), so that the drill bit assembly (33) can smoothly move toward the well wall.

3. The core-collecting device according to claim 2, characterized in that, The length of the guide slope (4) is greater than the length of the positioning slope (5). When the guide slope (4) abuts against the inner wall of one side of the second inclined hole (382), the positioning slope (5) is flush with the inner wall of the other side of the second inclined hole (382) so that the driving block (37) can slide smoothly along the second inclined hole (382).

4. The core-collecting device according to claim 2, characterized in that, The drive block (37) has two symmetrically arranged guide planes (6) on its sidewalls, and the two guide planes (6) cooperate with the inner walls on both sides of the horizontal hole (381) to achieve the guiding effect on the drive sleeve (34).

5. The core-harvesting device according to claim 2, characterized in that, The drive column (35) has two limiting inclined surfaces (7) symmetrically arranged on its side wall. When the guide inclined surface (4) abuts against the corresponding inner wall of the second inclined hole (382), the two limiting inclined surfaces (7) are respectively flush with the corresponding inner wall of the first inclined hole (362) so that the drive column (35) can slide smoothly along the first inclined hole (362).

6. The core-collecting device according to claim 1, characterized in that, The support part (32) includes two parallel support plates (321). The drill bit assembly (33) is located between the two support plates (321) and is rotatably connected to the two support plates (321) respectively by a pin (334). Guide blocks (322) are fixedly connected to the sides of the two support plates (321) that are far apart from each other. The receiving frame (31) is provided with two guide grooves (323), and the two guide blocks (322) are slidably connected to the corresponding guide grooves (323).

7. The core-harvesting device according to claim 6, characterized in that, The two support plates (321) are connected by a support bridge (324), and the two ends of the support bridge (324) are respectively slidably engaged with the corresponding guide grooves (323).

8. The core-collecting device according to claim 1, characterized in that, The drill bit assembly (33) includes a drive motor (331), a reducer (332) and a sampling drill bit (333) connected in sequence. The sampling drill bit (333) is perpendicular to the drive motor (331), and the reducer (332) is rotatably connected to the support (32).

9. The core-collecting device according to claim 1, characterized in that, The core extraction device also includes a pair of hydraulic telescopic release arms (9), the release arms (9) and the push arm (2) are distributed on both sides of the instrument body (1), and the release arms (9) can push the instrument body (1) to release the card.

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