In-situ core sampling device and method thereof

Abstract

The invention discloses an in-situ core sampling device, comprising a drilling tool, wherein the inner cavity of the drilling tool is divided into a sampling cavity and an outer cavity by a sampling tube, a plurality of cutter pieces are arranged at the opening of the outer cavity, and the cutter pieces are all driven by a driving mechanism, and an ejection mechanism is installed in the sampling cavity; the cutter piece comprises a threaded screw, which is connected to the driving mechanism through a bevel gear, a driving rod is connected to the threaded screw through a threaded engagement, and a cutter is installed at the other end of the driving rod; the driving mechanism comprises a power source arranged coaxially with the sampling tube, and a transmission gear meshing with the bevel gear is installed on the output shaft of the power source, and the device drives each cutter piece to cut the core through the forward rotation of the driving mechanism, and the cutter piece intermittently extended during the cutting process can make the cutter piece gradually contact with the core. At the same time, the reverse rotation of the driving mechanism drives the cutter piece to reset, and the ejection mechanism can also be synchronously driven to eject the core while the cutter piece is reset.

Description

Technical Field

[0001] The invention relates to the technical field of rock and soil sampling devices, and in particular to an in-situ core sampling device and a method thereof. Background Art

[0002] When sampling rock and soil samples, whether to take undisturbed soil or disturbed soil should be determined according to the nature of the project. All natural foundations, natural slopes, natural strata, etc. of buildings should take undisturbed soil, and the sampling of undisturbed soil generally requires the use of sampling devices.

[0003] For sampling layers with less gravel or rock, direct sampling is sufficient because the sampling layers are relatively loose. For sampling layers with more gravel or rock, core sampling is performed using a sampling tube because the sampling layers are relatively compact and hard. However, this device is not convenient for cutting off the core connected to the rock mass, making it difficult to remove the core during sampling, which makes sampling more troublesome.

[0004] At present, there is a rock and soil sample collection device disclosed in the patent number CN115389262A. The device mainly cuts the core by moving the cutting knife towards the middle to facilitate the separation of the core from the original rock layer. Although the core can be cut and taken out, the cut core will fit tightly on the inner wall of the sampling tube. When separating, it is generally necessary to use external force to knock. The intensity of the knocking is difficult to control, which can easily cause the core to break after separation, resulting in sampling failure.

[0005] At the same time, during sampling, the cutting knife is continuously extended by the driving mechanism, and the continuously extended cutting knife continuously penetrates into the core, thereby cutting off the core column. However, during the cutting process, the sampling tube is in a state of high-speed rotation, that is, the cutting knife rotates synchronously with the sampling, and during the rotation of the sampling tube, the extended cutting knife may not completely cut the core within the same diameter range to form an annular groove with equal outer diameter, but will form multiple discontinuous pits in the area of ​​equal outer diameter of the core, and the depths of the pits are different. The cutting knife is still in a state of continuing to move forward, so the pits in the same outer diameter area will become deeper and deeper. When the cutting knife rotates, the pits will hinder the movement of the cutting knife more and more obviously, and in severe cases, the cutting knife may be broken. Summary of the invention

[0006] The purpose of the present invention is to provide an in-situ core sampling device to solve the technical problems in the existing devices.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: an in-situ core sampling device, comprising a drill tool that rotates with an external driving source, wherein the inner cavity of the drill tool is divided into a sampling cavity and an outer cavity by a sampling tube, and the sampling cavity and the outer cavity are connected by a notch arranged at the opening, a plurality of cutting blades are arranged at the opening of the outer cavity, and the cutting blades are all driven by a driving mechanism installed at the top of the drill tool, and an ejection mechanism is installed in the sampling cavity at a position corresponding to the driving mechanism;

[0008] The cutter member comprises a threaded screw rod transversely arranged at the top of the outer chamber, the threaded screw rod is connected to the driving mechanism through a bevel gear, a driving rod is connected to the threaded screw rod through thread engagement, and a cutter is installed at the other end of the driving rod;

[0009] The driving mechanism comprises a power source coaxially arranged with the sampling tube, a transmission gear meshing with the bevel gear is installed on the output shaft of the power source, and the other end of the output shaft of the power source is unidirectionally connected with the ejection mechanism;

[0010] in:

[0011] The transmission gear is provided with a plurality of groups of discontinuous tooth grooves, and the number of tooth grooves in each group is equal, and the spacing between adjacent tooth grooves is equal;

[0012] When the output shaft of the power source rotates forward, the transmission gear intermittently drives the drive rod to move laterally according to the spacing of the plurality of tooth grooves, so as to drive the cutter to cut the core;

[0013] When the output shaft of the power source rotates in the reverse direction, the transmission gear drives the driving rod to move in the reverse direction to drive the cutter to reset. At the same time, the ejection mechanism moves downward under the drive of the one-way shaft to eject the core.

[0014] As a preferred solution of the present invention, the ejection mechanism includes a fixed seat, a rotating shaft and a lifting gear, wherein the fixed seat is fixedly connected in the inner chamber; the lifting gear is sleeved on the rotating shaft, one end of the rotating shaft is connected to the output shaft of the power source, and the other end is rotatably connected to the fixed seat and meshed with the lifting member through the lifting gear;

[0015] When the rotating shaft rotates, the lifting member is driven to move downward along the fixing seat to push out the core.

[0016] As a preferred solution of the present invention, the lifting member includes a plurality of transmission gears, a plurality of driven gears, a plurality of gear rods and a top seat, each of the transmission gears is rotatably connected to the fixed seat and can be meshed with the lifting gear, and each of the transmission gears and each of the driven gears are correspondingly connected through a fixed rod;

[0017] Several of the gear rods are slidably inserted into the fixed seat, each of the gear rods is meshed with a corresponding driven gear, and one end of each gear rod away from the fixed seat is fixedly connected to the top seat, and the top seat is slidably connected to the inner chamber.

[0018] As a preferred solution of the present invention, a bearing seat fixedly connected to the inner chamber is provided at the connection between the output shaft of the power source and the ejection mechanism, and a one-way bearing is provided at the connection between the rotating shaft and one end of the rotating shaft that rotates and extends out of the bottom of the bearing seat.

[0019] As a preferred solution of the present invention, the gear rod includes a main rod and a secondary rod, the top of the secondary rod is provided with a limiting groove for the sliding insertion of the main rod, a buffer spring is connected between the bottom of the limiting groove and the main rod, and the main rod is meshingly connected to the fifth gear.

[0020] As a preferred solution of the present invention, the main rod and the auxiliary rod are both configured as cylindrical structures, a through groove is provided on the outer wall of the main rod along its own height direction, and the inner cavity of the through groove is provided with a rack meshingly connected to the fifth gear.

[0021] As a preferred solution of the present invention, guide grooves are provided on the upper and lower ends of the notch, guide blocks are slidably connected in the two guide grooves, and a telescopic spring is connected between the guide block and the inner cavity of the guide groove. Under the elastic deformation of the telescopic spring, the two guide blocks are tightly pressed together to close the notch.

[0022] As a preferred solution of the present invention, the two guide blocks are provided with an inclined surface at one end close to the cutting knife, and the two inclined surfaces together form a structure similar to the tip of the cutting knife. Under the squeezing action of the cutting knife, the two inclined surfaces are gradually opened.

[0023] A core sampling method is also provided, the method comprising the following steps:

[0024] S100, inserting the rotating drill bit to a predetermined depth, and under the squeezing effect of the core, the ejection mechanism is reset to an initial state;

[0025] S200, starting the driving mechanism to rotate forward, the driving mechanism drives the transmission gear to make a circular motion, and the multiple groups of discontinuous tooth grooves in the transmission gear intermittently mesh with or disengage from the bevel gear, so as to intermittently drive the cutting knife on the driving rod to extend out of the notch until the core is cut off from the original rock layer;

[0026] S300, after the core is cut off, the rotation of the driving mechanism is stopped, and the drilling tool is pulled out from the original rock layer;

[0027] S400, after the drill tool is pulled out, the driving mechanism is started to rotate in the reverse direction, and the driving mechanism drives each of the cutting knives to reset;

[0028] During the process of resetting the cutting knives, the driving mechanism synchronously drives the ejection mechanism to move down a buffer distance at one end until each of the cutting knives is completely retracted into the slots, at which time the ejection mechanism continues to move down to eject the core in the sampling tube;

[0029] S500, repeating the process of steps S100-S400 to carry out the next rock formation sampling to achieve continuous sampling.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The device drives each of the cutting blades to cut the core through the forward rotation of the driving mechanism, and the extended cutting blade can also support the core. The intermittent extension of the cutting blade during the cutting process can make the cutting blade gradually contact the core, that is, the cutting blade will briefly stay at the same outer diameter during the high-speed rotation of the sampling tube, and the cutting blade will extend toward the core when the sampling tube rotates for one or several weeks. In this way, the core can be completely ground at the same outer diameter before entering the inner diameter for complete cutting and grinding, which reduces the generation of pits and grooves and avoids the possibility of the cutting blade breaking due to incomplete grinding and cutting of the core outer diameter.

[0032] At the same time, the reverse rotation of the driving mechanism drives the cutter member to reset, and while the cutter member is reset, the ejection mechanism can also be synchronously driven to eject the core collected in the inner chamber, thereby realizing rapid removal of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0035] Figure 2 For the present invention Figure 1 A partially enlarged structural schematic diagram;

[0036] Figure 3 For the present invention Figure 1 The main view of

[0037] Figure 4 For the present invention Figure 3 The enlarged structural diagram of part A in the middle;

[0038] Figure 5 For the present invention Figure 2 Structural diagram of the middle ejection mechanism;

[0039] Figure 6 For the present invention Figure 3 Part B in the middle is an enlarged schematic diagram of the connection structure;

[0040] Figure 7 For the present invention Figure 5 Schematic diagram of the structure of the middle gear rod;

[0041] Figure 8 For the present invention Figure 4 A schematic diagram of the structure of the first gear;

[0042] Fig. 9 For the present invention Figure 1 Schematic diagram of the structure of the sampling tube;

[0043] Fig.10 For the present invention Figure 3 Schematic diagram of the overall structure when the cutting knife of the middle sampling tube is ejected;

[0044] Fig.11 For the present invention Figure 3 Schematic diagram of the structure after the middle sampling tube cutter is reset;

[0045] The numbers in the figure represent the following:

[0046] 1. Drilling tool; 2. Sampling chamber; 3. External chamber; 4. Driving mechanism; 5. Cutter; 6. Ejector mechanism; 7. Bearing seat; 8. Notch; 10. Main rod; 11. Limiting groove; 12. Auxiliary rod; 13. Buffer spring; 14. Through groove; 15. Rack; 16. Guide groove; 17. Guide block; 18. Telescopic spring; 19. Inclined surface; 20. Core;

[0047] 41. Power source; 42. Tooth groove; 43. Transmission gear;

[0048] 51. threaded screw; 52. bevel gear; 53. drive rod; 54. cutting knife;

[0049] 61. Rotating shaft; 62. Lifting gear; 63. Lifting member; 64. One-way bearing; 65. Fixed seat; 631. Driving gear; 632. Driven gear; 633. Gear rod; 634. Fixed rod; 635. Top seat. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] like Figure 1-4 As shown, an in-situ core sampling device comprises a drill 1 rotating with an external driving source, the inner cavity of the drill 1 is divided into a sampling cavity 2 and an outer cavity 3 by a sampling tube, and the sampling cavity 2 and the outer cavity 3 are connected by a notch 8 arranged at the opening, a plurality of cutter members 5 are arranged at the opening of the outer cavity 3, the cutter members 5 are all driven by a driving mechanism 4 installed on the top of the drill 1, and an ejection mechanism 6 is installed in the sampling cavity 2 at a position corresponding to the driving mechanism 4;

[0052] The cutter member 5 comprises a threaded screw rod 51 which is transversely arranged at the top of the outer chamber 3. The threaded screw rod 51 is connected to the driving mechanism 4 through a bevel gear 52. A driving rod 53 is connected to the threaded screw rod 51 through a threaded engagement. A cutter 54 is installed at the other end of the driving rod 53.

[0053] The driving mechanism 4 includes a power source 41 coaxially arranged with the sampling tube, a transmission gear 43 meshing with the bevel gear 52 is installed on the output shaft of the power source 41, and the other end of the output shaft of the power source 41 is unidirectionally connected with the ejection mechanism 4;

[0054] in:

[0055] The transmission gear 43 is provided with a plurality of discontinuous tooth grooves 42, and the number of tooth grooves 42 in each group is equal, and the spacing between adjacent tooth grooves 42 is equal;

[0056] When the output shaft of the power source 41 rotates forward, the transmission gear 43 intermittently drives the driving rod 53 to move horizontally according to the spacing of the multiple groups of tooth grooves 42, so as to drive the cutting knife 54 to cut the core;

[0057] When the output shaft of the power source 41 rotates in the reverse direction, the transmission gear 43 drives the driving rod 53 to move in the reverse direction to drive the cutting knife 54 to reset. At the same time, the ejection mechanism 4 moves downward under the drive of the one-way shaft to eject the core.

[0058] When the cutter drive mechanism 4 drives each cutter member 5 to approach the center of the sampling chamber 2, the ejection mechanism 6 is disconnected from the output shaft to independently cut the core.

[0059] When the cutter drive mechanism 4 drives each cutter element 5 away from the center of the sampling chamber 2, the ejection mechanism 6 is meshed and linked with the output shaft, so that when the cutter drive mechanism 4 drives each cutter element 5 to be recovered to the sampling chamber 3, the ejection mechanism 6 is driven to move downward and eject the core;

[0060] The drilling tool 1 is used in conjunction with an external driving device, namely a conventional downward-pressing rotary device, which can ensure the rotation and lifting of the drilling tool 1.

[0061] When the cutter drive mechanism rotates in the forward direction, the device can drive each cutter member 5 to move closer to the center of the sampling chamber 2, and the core is cut by the cutter member. The extended cutter member can also support the core, which is equivalent to supporting the bottom of the core after the cut-off, thereby reducing the possibility of the core being separated from the sampling tube during the removal process.

[0062] At the same time, the intermittent extension of the cutting blade can gradually make the cutting blade contact with the core, that is, when the sampling tube rotates for one or several weeks, the cutting blade extends toward the core. In this way, the core can be completely ground with the same outer diameter before entering the inner diameter for complete cutting and grinding, thus avoiding the possibility of the cutting blade breaking due to incomplete grinding and cutting of the outer diameter of the core.

[0063] like Figure 3 , Figure 4 and Figure 6 As shown, the number of the cutting blade elements 5 is at least three, and the three cutting blade elements 5 can be meshed and connected with the tooth groove 42, that is, under the action of the rotation of the tooth groove 42, the three cutting blade elements 5 are synchronously approached to each other or synchronously moved away from each other.

[0064] Further, such as Figure 1 , Figure 2 As shown in Figure 6, both ends of the sampling chamber 3 are configured as closed structures, and the sampling cavity 2 is configured as a structure with one end closed and the other end open.

[0065] Since the driving mechanism 4 has two rotation trends, and the movement trends between the cutter driving mechanism 4 and the ejection mechanism 6 in the two rotation trends need to be different, that is, when the cutter driving mechanism 4 drives the cutter 54 to extend into the sampling cavity 2, the ejection mechanism 6 cannot be ejected.

[0066] Specifically, Figure 4-5As shown, the ejection mechanism 6 includes a fixed seat 65, a rotating shaft 61, a lifting gear 62 and a lifting member 63, the fixed seat 65 is fixedly connected in the sampling chamber 2; the lifting gear 62 is sleeved on the rotating shaft 61, one end of the rotating shaft 61 is connected to the output shaft of the power source 41, and the other end is rotatably connected to the fixed seat 65, and is meshed and connected with the lifting member 63 through the lifting gear 62;

[0067] When the rotating shaft 61 rotates, the lifting member 63 is driven to move downward along the fixing seat 65 to push out the core.

[0068] Since the rotating shaft 61 can only rotate in a single direction, and the lifting member 63 must be able to be reset after being ejected, it is necessary to realize the movement of the lifting member 63 in two dimensions in a single direction.

[0069] Specifically, a bearing seat 7 fixedly connected to the sampling chamber 2 is provided at the connection between the output shaft of the power source 41 and the ejection mechanism 6, and a one-way bearing 64 is provided at the connection between the rotating shaft 61 and one end of the output shaft of the power source 41 that rotates and extends out from the bottom of the bearing seat 7.

[0070] The bearing seat 7 mainly serves to connect and fix the output shaft of the power source 41 and the rotating shaft 61 , and the one-way bearing 64 can rotate in one direction.

[0071] Specifically, Figure 2 and Figure 4-5 As shown, the lifting member 63 includes a plurality of driving gears 631, a plurality of driven gears 632, a plurality of gear rods 633 and a top seat 635. Each driving gear 631 is rotatably connected to the fixed seat 65 and can be meshed with the lifting gear 62. Each driving gear 631 and each driven gear 632 are correspondingly connected through a fixed rod 634.

[0072] Several gear rods 633 are slidably inserted into the fixed seat 65, and each gear rod 633 is meshed with a corresponding driven gear 632. One end of each gear rod 633 away from the fixed seat 65 is fixedly connected to the top seat 635, and the top seat 635 is slidably connected to the sampling chamber 2.

[0073] The reverse rotation of the cutter drive mechanism can not only move the cutter away from the core and recover it into the outer chamber, but also synchronously drive the ejection mechanism to eject the core collected in the inner chamber, thereby realizing rapid removal of the core.

[0074] The cutter 54 plays a certain obstructive role in the process of core ejection, that is, when the rotating shaft 61 and the output shaft of the driving source 41 rotate synchronously in opposite directions, the gear rod 633 cannot continue to move downward due to the obstruction of the cutter, that is, the gear rod 633 that cannot move downward will also hinder the transmission between the rotating shaft 61 and the output shaft, thereby making it impossible for the cutter to be retracted and the core to be ejected. In order to avoid this phenomenon, the gear rod 633 needs to be designed as a two-stage structure.

[0075] Specifically, Figure 1-7 As shown, the gear rod 633 includes a main rod 10 and a sub-rod 12. A limiting groove 11 is provided at the top of the sub-rod 12 for the main rod 10 to slide and insert. A buffer spring 13 is connected between the bottom of the limiting groove 11 and the main rod 10. The main rod 10 is meshed and connected with the driven gear 632.

[0076] Due to the sliding gap between the main rod 10 and the auxiliary rod 12, when the cutter 54 is not fully retracted, the rotating shaft 61 drives the main rod 10 to slide along the inner cavity of the auxiliary rod 12 until the cutter is fully retracted, and the core is squeezed out under the elastic deformation of the buffer spring 13.

[0077] Since the gear rod 633 mainly plays the role of transmitting the bearing force, the structural strength of the gear rod 633 needs to be improved.

[0078] Further, such as Figure 7 As shown, the main rod 10 and the auxiliary rod 12 are both configured as cylindrical structures. A through groove 14 is provided on the outer wall of the main rod 10 along its own height direction, and a rack 15 meshingly connected to the driven gear 632 is provided in the inner cavity of the through groove 14.

[0079] When the cutter 54 is cutting the core, the cut core is easy to enter the sampling chamber 2 from the notch 8, and the cutter is also easy to be contaminated with the core after cutting. After recovery, the cut core debris will also enter the sampling chamber 2 along with the cutter, and the sampling chamber 2 is in a closed state, which makes it difficult to remove the core debris. The long-term accumulation of residual core debris will interfere with the movement of the cutter.

[0080] Specifically, Figure 3 , Figure 6 and Fig. 9 As shown, guide grooves 16 are provided on the upper and lower ends of the slot 8, guide blocks 17 are slidably connected in the two guide grooves 16, and telescopic springs 18 are connected between the guide blocks 17 and the inner cavities of the guide grooves 16. Under the elastic deformation of the telescopic springs 18, the two guide blocks 17 are tightly pressed together to close the slot 8.

[0081] Further, such as Figure 6 and Fig. 9As shown, the ends of the two guide blocks 17 close to the cutting knife 54 are both provided with inclined surfaces 19 , and the two inclined surfaces 19 together form a structure similar to the tip of the cutting knife 54 . Under the squeezing action of the cutting knife 54 , the two inclined surfaces 19 are gradually opened.

[0082] In this way, the guide block 17 can be closely attached to the surface of the cutter 54, reducing the gap in the notch 8, preventing the core debris after cutting from entering the outer chamber 3, and during the recovery process of the cutter 54, the two inclined surfaces 19 can also clean the core debris on the surface of the cutter, further reducing the possibility of the core debris after cutting entering the outer chamber 3.

[0083] A core sampling method is also provided, the method comprising the following steps:

[0084] S100, inserting the rotating drilling tool 1 to a predetermined depth, and under the squeezing effect of the core, the ejection mechanism 6 is reset to the initial state;

[0085] S200, start the driving mechanism 4 to rotate forward, the driving mechanism 4 drives the transmission gear 43 to make a circular motion, and the multiple groups of discontinuous tooth grooves 42 in the transmission gear 43 intermittently mesh with or disengage from the bevel gear 52, and the cutter 54 on the driving rod 53 is driven intermittently to extend out of the notch 8 until the core is cut off from the original rock layer;

[0086] S300, after the core is cut off, the rotation of the driving mechanism 4 is stopped, and the drilling tool 1 is pulled out from the original rock layer;

[0087] S400, after the drilling tool 1 is pulled out, the driving mechanism 4 is started to rotate in the reverse direction, and the driving mechanism 4 drives each cutting knife 54 to reset;

[0088] During the resetting process of the cutter 54, the driving mechanism 4 synchronously drives the ejection mechanism 6 to move down by a buffer distance until each cutter 54 is completely retracted into the notch 8, at which time the ejection mechanism 6 continues to move down to eject the core in the drilling tool 1;

[0089] S500, repeating the process of steps S100-S400 to carry out the next rock formation sampling to achieve continuous sampling.

[0090] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. An in-situ core sampling device, characterized in that: The invention comprises a drilling tool (1) which rotates with an external driving source, wherein a sampling tube arranged in the inner cavity of the drilling tool (1) is divided into a sampling cavity (2) and an outer cavity (3), and the sampling cavity (2) and the outer cavity (3) are connected via a notch (8) arranged at the opening, a plurality of cutting blades (5) are arranged at the opening of the outer cavity (3), and the cutting blades (5) are all driven by a driving mechanism (4) installed at the top of the drilling tool (1), and an ejection mechanism (6) is installed in the sampling cavity (2) at a position corresponding to the driving mechanism (4); The cutting blade member (5) comprises a threaded screw (51) arranged transversely at the top of the outer chamber (3); the threaded screw (51) is connected to the driving mechanism (4) via a bevel gear (52); a driving rod (53) is connected to the threaded screw (51) via a threaded engagement; and a cutting blade (54) is mounted on the other end of the driving rod (53); The driving mechanism (4) comprises a power source (41) coaxially arranged with the sampling tube, a transmission gear (43) meshing with the bevel gear (52) is mounted on the output shaft of the power source (41), and the other end of the output shaft of the power source (41) is unidirectionally connected to the ejection mechanism (6); in: The transmission gear (43) is provided with a plurality of groups of discontinuous tooth grooves (42), and the number of the tooth grooves (42) in each group is equal, and the spacing between adjacent tooth grooves (42) is equal; When the output shaft of the power source (41) rotates in the forward direction, the transmission gear (43) intermittently drives the driving rod (53) to move laterally according to the spacing of the plurality of groups of tooth grooves (42), so as to drive the cutting knife (54) to cut the core; When the output shaft of the power source (41) rotates in the reverse direction, the transmission gear (43) drives the driving rod (53) to move in the reverse direction to drive the cutting knife (54) to reset. At the same time, the ejection mechanism (6) moves downward under the drive of the one-way shaft to eject the core; The ejection mechanism (6) comprises a fixed seat (65), a rotating shaft (61), a lifting gear (62) and a lifting member (63); the fixed seat (65) is fixedly connected in the sampling chamber (2); the lifting gear (62) is sleeved on the rotating shaft (61); one end of the rotating shaft (61) is connected to the output shaft of the power source (41), and the other end is rotatably connected to the fixed seat (65), and is meshedly connected to the lifting member (63) through the lifting gear (62); When the rotating shaft (61) rotates, the lifting member (63) is driven to move downward along the fixing seat (65) to push out the core; The lifting member (63) comprises a plurality of driving gears (631), a plurality of driven gears (632), a plurality of gear rods (633) and a top seat (635); each of the driving gears (631) is rotatably connected to the fixed seat (65) and can be meshed with the lifting gear (62); each of the driving gears (631) and each of the driven gears (632) are correspondingly connected in transmission via a fixed rod (634); A plurality of the gear rods (633) are slidably inserted into the fixed seat (65), each of the gear rods (633) is meshedly connected with a corresponding driven gear (632), and one end of each gear rod (633) away from the fixed seat (65) is fixedly connected to the top seat (635), and the top seat (635) is slidably connected to the sampling chamber (2); The gear rod (633) comprises a main rod (10) and a secondary rod (12); a limiting groove (11) for the main rod (10) to be slidably inserted is provided on the top of the secondary rod (12); a buffer spring (13) is connected between the bottom of the limiting groove (11) and the main rod (10); and the main rod (10) is meshedly connected with the driven gear (632); The main rod (10) and the auxiliary rod (12) are both configured as cylindrical structures, and a through groove (14) is provided on the outer wall of the main rod (10) along its own height direction, and the inner cavity of the through groove (14) is provided with a rack (15) meshingly connected to the driven gear (632).

2. The in-situ core sampling device according to claim 1, characterized in that: A bearing seat (7) fixedly connected to the sampling chamber (2) is provided at the connection between the output shaft of the power source (41) and the ejection mechanism (6), and a one-way bearing (64) is provided at the connection between the rotating shaft (61) and one end of the output shaft of the power source (41) that rotates and extends out of the bottom of the bearing seat (7).

3. The in-situ core sampling device according to claim 1, characterized in that: The notch (8) is provided with guide grooves (16) at both upper and lower ends, and guide blocks (17) are slidably connected in the two guide grooves (16). A telescopic spring (18) is connected between the guide block (17) and the inner cavity of the guide groove (16). Under the elastic deformation of the telescopic spring (18), the two guide blocks (17) are tightly pressed together to close the notch (8).

4. The in-situ core sampling device according to claim 3, characterized in that: The two guide blocks (17) are each provided with an inclined surface (19) at one end close to the cutting knife (54); the two inclined surfaces (19) together form a structure similar to the tip of the cutting knife (54); and the two inclined surfaces (19) are gradually opened under the squeezing action of the cutting knife (54).

5. An in-situ core sampling method, characterized in that: The method is implemented by using an in-situ core sampling device according to any one of claims 1 to 4, and the method comprises the following steps: S100, inserting the rotating drilling tool (1) to a predetermined depth, and under the squeezing effect of the core, the ejection mechanism (6) is reset to an initial state; S200, starting the driving mechanism (4) to rotate forward, the driving mechanism (4) drives the transmission gear (43) to make a circular motion, and the multiple groups of discontinuous tooth grooves (42) in the transmission gear (43) intermittently mesh with or disengage from the bevel gear (52), so as to intermittently drive the cutting knife (54) on the driving rod (53) to extend out of the notch (8) until the core is cut off from the original rock layer; S300, after the core is cut off, the rotation of the driving mechanism (4) is stopped, and the drilling tool (1) is pulled out from the original rock layer; S400, after the drilling tool (1) is pulled out, the driving mechanism (4) is started to rotate in the reverse direction, and the driving mechanism (4) drives each of the cutting knives (54) to reset; During the resetting process of the cutting blade (54), the driving mechanism (4) synchronously drives the ejection mechanism (6) to move downward by a buffer distance until each of the cutting blades (54) is completely retracted into the slot (8), at which time the ejection mechanism (6) continues to move downward to eject the core in the drilling tool (1); S500, repeating the process of steps S100-S400 to carry out the next rock formation sampling to achieve continuous sampling.

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