A road coring device and method

Abstract

The application discloses a road coring device and a coring method, relates to the technical field of road construction, and solves the technical problem that in the drilling and coring process of the existing road coring machine, the core sample will bear additional torque or pressure, which easily leads to the fracture or deformation of the core sample, thereby affecting the road condition judgment. The application comprises a coring module, which comprises a drilling cylinder, a first driving motor connected to the drilling cylinder, a cutter body arranged at the lower end of the drilling cylinder, an inner cylinder arranged in the drilling cylinder, a first bearing arranged between the inner cylinder and the drilling cylinder, a movable ring connected with the drilling cylinder through a second bearing, a second hook arranged at the lower end of the movable ring, and a limiting assembly arranged between the movable ring and the inner cylinder and used for limiting the rotation of the movable ring. The application has the advantages of maintaining the integrity of the core sample and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of road construction, and particularly relates to a road coring device and a coring method. BACKGROUND

[0002] Road coring is to drill a cylindrical road sample by a special coring drill, and the road coring is a crucial detection and evaluation method in road engineering, and the fundamental purpose is to infer and judge the health condition and quality of the whole road through a small part of sampling, wherein the quality control and completion acceptance are the most commonly used scenes of coring, and the height of the core sample can be directly measured to accurately check whether the actual thickness of each structure layer of the road surface meets the design drawing and specification requirements; secondly, the road condition can be investigated and disease diagnosed through the core sample. In short, the road coring is a direct and reliable road inspection method, which is throughout the whole life cycle of the road construction, acceptance, maintenance and even scrapping, and is of great significance to guarantee the road engineering quality, prolong the service life of the road and ensure the driving safety.

[0003] At present, the road coring machine is usually used for coring sampling, and the core component lies in a core barrel and a power assembly, the core barrel is driven to rotate by the power assembly to realize the cutting of the ground, and the up-down movement of the core barrel is usually realized by a screw structure, and the movement of the core barrel is realized by manually controlling the rotation of the screw or by driving the screw to rotate by a motor, but in the existing structure, the friction between the inner wall of the core barrel and the core sample generates a torque in the drilling process, which easily causes the core sample to be twisted and broken, in addition, the core sample is usually pushed out of the core barrel by a core pusher in the process of taking out the core sample, and this method easily causes the core sample to be deformed or damaged, and further affects the subsequent road condition judgment. SUMMARY

[0004] Therefore, the application discloses a road coring device and a coring method, and aims to solve the technical problem that the core sample will bear additional torque or pressure in the drilling and coring process of the existing road coring machine, which easily causes the core sample to be broken or deformed, thereby affecting the road condition judgment.

[0005] To solve the above-mentioned technical problems, the technical scheme adopted by the application is as follows:

[0006] A road coring device comprises:

[0007] A coring module comprises:

[0008] A drilling barrel is connected with a first driving motor, and a cutter body is arranged at the lower end of the drilling barrel;

[0009] An inner barrel is arranged in the drilling barrel, and a first bearing is detachably arranged between the inner barrel and the drilling barrel;

[0010] The movable ring is connected with the drilling cylinder through a second bearing, and a second hook is arranged at the lower end of the movable ring, which can abut against the cutter body to drive the movable ring to rotate with the drilling cylinder;

[0011] A limiting assembly is arranged between the movable ring and the inner cylinder to limit the rotation of the movable ring.

[0012] The lower end of the movable ring is rotatably provided with a plurality of material holding cutters, which can be unfolded by cooperating with the inner side of the cutter body.

[0013] In the present application, the first driving motor drives the drilling cylinder to rotate, thereby driving the cutter body to drill into the ground. During this process, the core sample to be taken enters the inner cylinder, and the inner cylinder plays a role in clamping and fixing the core sample during the subsequent process of taking out the core sample. The limiting assembly changes the relative rotation state between the movable ring and the inner cylinder. Specifically, when the first driving motor rotates in the forward direction, i.e., during drilling, the rotation of the drilling cylinder drives the cutter body to rotate until the cutter body abuts against the second hook on one side. Therefore, under the rotation of the drilling cylinder and the abutment of the cutter body and the second hook, the drilling cylinder will drive the movable ring to rotate. At this time, the limiting assembly does not limit the rotation of the movable ring, and the weight of the inner cylinder arranged on the movable ring is large. After the core sample enters the clamping cylinder, the core sample rubs against the inner wall of the inner cylinder. The combined action of the two causes the inner cylinder to rotate relative to the drilling cylinder and the movable ring under the action of the first bearing, thereby separating the core sample from the rotating drilling cylinder and reducing the torque on the core sample caused by the rotation of the drilling cylinder, thereby preventing the core sample from being torn by the torque.

[0014] In addition, before the core sample is taken out, the first driving motor will rotate in the reverse direction. The reverse rotation of the first driving motor will drive the drilling cylinder to reverse. At this time, the cutter body and the second hook will be disengaged. During this process, the side wall of the material holding cutter will gradually abut against the inner side of the cutter body, generating a force that drives the material holding cutter to rotate towards the center of the drilling cylinder. During the continuous reverse rotation, the material holding cutter gradually unfolds to make incisions in the ground. When the inner cylinder is subsequently lifted, it is convenient to pull the core sample apart.

[0015] Preferably, a first bolt is arranged on the outer ring and / or the inner ring of the first bearing, and a plurality of through holes are formed in the drilling cylinder and / or the positioning cylinder, and the first bolt is connected to the outer ring of the first bearing or the inner ring of the first bearing through the through holes.

[0016] After adopting the technical scheme, the first bearing is connected to the drilling cylinder and the positioning cylinder through the first bolt, so that the structure is more stable during the rotation of the drilling cylinder. Before the core sample is taken out, the first bolt on the drilling cylinder needs to be unscrewed, and the positioning cylinder can be pulled out. During this process, the first bearing is pulled out together.

[0017] Preferably, the inner wall of the drilling cylinder is provided with an annular mounting clamping groove, the outer ring of the second bearing is mounted in the mounting clamping groove, and the inner ring of the second bearing is connected with the outer wall of the movable ring. The mounting clamping groove has two purposes, one is to provide more space for mounting the second bearing, and the other is to make the rotation of the second bearing more stable.

[0018] Preferably, the limiting assembly comprises:

[0019] The first positioning tooth is arranged on the lower end of the inner cylinder.

[0020] The positioning tooth assembly comprises:

[0021] The arc-shaped plate is connected to the upper end of the movable ring through the first elastic member.

[0022] The second positioning tooth is arranged on the arc-shaped plate, and the first positioning tooth and the second positioning tooth cooperate to enable the movable ring to rotate in a single direction relative to the inner cylinder.

[0023] After the technical scheme is adopted, it should be noted that, during the forward rotation of the drilling cylinder driven by the first driving motor, the first positioning tooth will continuously press the second positioning tooth due to the relative rotation relationship between the movable ring and the inner cylinder, thereby pressing the first elastic member to press down the arc-shaped plate. At this time, the limiting assembly is in contact with the limit, so that the movable ring and the inner cylinder rotate relative to each other. During the reverse rotation of the first driving motor, the side wall of the first positioning tooth abuts against the side wall of the second positioning tooth, thereby limiting the rotation of the movable ring relative to the inner cylinder, and the gripping cutter rotates relative to the cutter body, thereby cooperating with the inner side of the cutter body.

[0024] Preferably, the first positioning tooth is an inverted right triangle, and the second positioning tooth is a right triangle. When the first positioning tooth and the second positioning tooth abut against each other, the right angle sides of the first positioning tooth and the second positioning tooth abut against each other, thereby limiting the rotation of the movable ring. When rotating in the forward direction, the oblique sides of the first positioning tooth and the second positioning tooth are in contact, thereby generating a downward pressing force on the arc-shaped plate, thereby realizing the relative rotation of the movable plate and the inner cylinder.

[0025] Preferably, the inner side of the cutter body is provided with an arc-shaped guide groove in the circumferential direction, the gripping cutter is arc-shaped, and the outer side wall of the gripping cutter can abut against the inner wall of the guide groove and expand the gripping cutter.

[0026] After the technical scheme is adopted, it should be noted that the inner wall of the guide groove is also arc-shaped. During the contact between the gripping cutter and the inner wall of the guide groove, the outward force received by the gripping cutter will become larger and larger, thereby making the gripping cutter rotate and expand. In the default state, the gripping cutter is recovered at the lower end of the movable ring, thereby avoiding affecting the coring.

[0027] Preferably, the inner cylinder comprises:

[0028] Positioning cylinder;

[0029] Clamping cylinder, which is enclosed by a plurality of clamping plates, the upper end diameter of the clamping cylinder is consistent with the diameter of the positioning cylinder, the lower end diameter of the clamping cylinder is larger than the diameter of the positioning cylinder, a gap is left between two adjacent clamping plates, and the first positioning tooth is arranged at the lower end of the clamping plate.

[0030] After adopting the technical scheme, it should be noted that the positioning cylinder is in a cylindrical shape, and the inner diameter thereof is consistent with the inner diameter of the movable ring. It should also be noted that the width of the drill body is consistent with the sum of the wall thickness of the drilling cylinder and the wall thickness of the movable ring. Therefore, the diameter of the core sample depends on the inner diameter of the movable ring. When the core sample enters the positioning cylinder, the inner diameter thereof can just accommodate the core sample, which is beneficial to subsequent removal. In addition, the clamping cylinder has two purposes. On the one hand, it guides the path when the core sample enters, so that the core sample can smoothly enter the positioning cylinder. On the other hand, in the removal process, the clamping cylinder will be inwardly folded to clamp the core sample, thereby ensuring the stability of the coring process and reducing the damage to the core sample.

[0031] As a preferred, the inner cylinder further comprises:

[0032] Positioning ring, which is arranged in the interior of the drilling cylinder in a sliding manner, and the inner wall of the positioning ring is provided with an inclined surface in the axial direction. The inner diameter of the upper end of the clamping cylinder is smaller than the outer diameter of the lower end of the clamping cylinder. The outer wall of the clamping plate is provided with a first hook which can cooperate with the positioning ring. The positioning ring and the drilling cylinder are connected by a shear pin.

[0033] After adopting the technical scheme, it should be noted that the positioning ring has the function of folding the clamping cylinder. Specifically, when the positioning cylinder is pulled outward, the positioning cylinder drives the clamping cylinder to move until the clamping cylinder abuts against the inner wall of the positioning ring. During the continuous outward movement, the abutting force between the lower end of the clamping cylinder and the inner wall of the clamping cylinder becomes larger, thereby generating a larger force to drive the folding of each clamping plate, and finally achieving the clamping of the core sample. During the continuous outward movement, the shear pin is subjected to an increasing stress until it breaks. At this time, the positioning cylinder and the clamping cylinder can be pulled out. The purpose of the first hook is to cooperate with the positioning ring during the pulling-out process to achieve a better clamping effect.

[0034] Further, a plurality of vertical limiting sliding grooves are arranged on the inner wall of the drilling cylinder in the axial direction. The outer wall of the movable ring is provided with a guide rail corresponding to the limiting sliding grooves, and the guide rail and the limiting sliding grooves are in sliding cooperation.

[0035] As a preferred, the lower end of the positioning ring is provided with a fixing assembly, and the fixing assembly comprises:

[0036] Movable plate, an annular groove is formed in the lower end of the positioning ring for inserting the first hook, the movable plate is arranged in the annular groove, and a second elastic member is connected between the movable plate and the annular groove.

[0037] A clamping plate is provided, and a third elastic element is connected between the clamping plate and the side wall of the annular groove. The movable plate abuts against the clamping plate.

[0038] After adopting this technical solution, it should be noted that, considering the friction between the positioning ring and the drilling cylinder during the pulling out of the positioning cylinder and clamping cylinder may cause relative slippage between the positioning ring and the clamping cylinder, the fixing component can ensure that the positioning ring remains relatively stationary with respect to the clamping cylinder during the pulling out of the positioning cylinder and clamping cylinder, thereby improving clamping stability. In addition, the movable plate and the clamping plate are set vertically, and the clamping plate is located on one side of the movable plate. By default, the side of the movable plate will abut against the clamping plate, causing the third elastic element to be in a compressed state. Specifically, during the pulling out of the clamping cylinder, the first hook will enter the annular groove and squeeze the movable plate. During the continuous pulling out, the first hook will further squeeze the movable plate until the movable plate is squeezed to the point of being misaligned with the clamping plate. At this time, under the action of the third elastic element, the side clamping plate will be pushed towards the first hook to squeeze the first hook, thereby fixing the position of the positioning ring and achieving stable clamping during the pulling out of the positioning ring.

[0039] Preferably, the blade body includes:

[0040] The tool holder is located at the lower end of the drilling cylinder, the guide groove is located inside the tool holder, and a first diversion part and a second diversion part are respectively provided on both sides of the tool holder;

[0041] The cutter head is provided with at least one cutter head on the cutter holder.

[0042] After adopting this technical solution, it should be noted that the function of the first diversion section and the second diversion section is to divert the soil fragments cut by the drilling, thereby reducing interference with the drilling of the cutter head.

[0043] Preferably, the cutter head is also provided with a transition slope, which is beneficial for the removal of soil fragments during drilling.

[0044] Preferably, the upper end of the drilling barrel is detachably connected to a cover, and the cover is provided with a connecting shaft, which is connected to the output shaft of the first drive motor.

[0045] After adopting this technical solution, it should be noted that the cover body mainly serves as a connector. The outer periphery of the cover body is evenly distributed with circumferential second bolts, which connect the cover body and the drilling barrel. Before core extraction, the second bolts on the cover body need to be unscrewed to separate the drilling barrel and the first drive motor.

[0046] Preferably, one end of the material-holding knife is provided with a rotating rod, and the lower end of the movable ring is provided with a hinge hole. The rotating rod and the hinge hole cooperate to realize the rotation of the material-holding knife. In addition, the knife holder is also provided with an abutment groove, one end of which penetrates through the knife holder. The stability of the material-holding knife unfolding is improved by limiting the position of the abutment groove. Secondly, during the forward rotation of the first drive motor, the second hook will pass through the abutment groove until it abuts against the side wall of the abutment groove.

[0047] As a preferred option, it also includes:

[0048] A movable body, wherein a positioning cone is provided at the lower end of the movable body;

[0049] A lifting module is mounted on the moving body and connected to the first drive motor.

[0050] After adopting this technical solution, it should be noted that the main purpose of the moving body is to provide mobility and support for the installation of the first drive motor and the core module. The lifting module works in conjunction with the first drive motor to realize the drilling of the drilling barrel.

[0051] Preferably, the moving body includes:

[0052] A support frame, with support plates connected between the support frames, a handle at the upper end of the support frame, a lifting module located on one side of the support frame, and rollers located on the other side of the support frame;

[0053] An extension frame is provided on the side of the support frame opposite to the roller. There are two extension frames located at the left and right ends of the support frame. The support frame is L-shaped. The positioning cone is provided at the lower end of both the support frame and the lower end of the extension frame.

[0054] After adopting this technical solution, it should be noted that during the drilling and coring process, the support frame is in a vertical position, and the positioning cone is inserted into the foundation to ensure stability. During this process, the rollers do not contact the ground. During the movement, the handle is pulled to tilt the support frame, and then the rollers are used for movement.

[0055] Preferably, the lifting module includes:

[0056] The second drive motor is located on one side of the support frame;

[0057] A lead screw, one end of which is connected to the output end of the second drive motor;

[0058] A slider is threadedly engaged with the lead screw and slidably connected to the support plate. A mounting plate is connected to one side of the slider, and a mounting bracket is mounted on one side of the mounting plate. The first drive motor is mounted on the mounting bracket.

[0059] A connecting seat is provided on the support frame, and the other end of the lead screw is rotatably engaged with the connecting seat.

[0060] After adopting this technical solution, it should be noted that the slider moves up and down by relying on the lead screw and slider structure. The movement of the slider drives the mounting plate, mounting frame and first drive motor to move up and down, thereby realizing the raising and lowering of the core extraction module.

[0061] A road core sampling method includes the following steps:

[0062] S1: Move the moving body to the position where the core is to be extracted, keep the core extraction module vertical and fix the moving body;

[0063] Step S1 includes a moving process and a fixing process. The moving process involves a person manually operating the handle to tilt the support frame, causing the rollers to contact the ground, thereby transferring the object. The fixing process involves adjusting the support frame to be vertical so that the positioning cone is inserted into the ground, thus fixing the entire moving object.

[0064] S2: Adjust the material holding knife to the retracted state, start the first drive motor and the second drive motor to drive the drilling barrel to rotate and the core module to descend, until the drilling reaches the designated position, then stop the first drive motor and the second drive motor. During this process, the drilling barrel and the movable ring rotate synchronously.

[0065] In step S2, the second hook is adjusted to abut against the abutment groove, at which point the material-holding knife is just located in the guide groove;

[0066] S3: Control the first drive motor to reverse, the drilling cylinder and the movable ring rotate relative to each other, the material holding knife will cooperate with the guide groove on the knife holder and gradually unfold and cut the lower end of the core sample, and the first drive motor will stop after it is fully unfolded;

[0067] In step S3, when the first drive motor reverses, the second hook no longer contacts the knife holder. At this time, the outer side of the material-holding knife gradually abuts against the guide groove, thereby causing the material-holding knife to unfold and cut the foundation.

[0068] S4: Remove the cover and pull the positioning cylinder outward. The positioning cylinder will drive the clamping cylinder to rise synchronously until the inner wall of the clamping cylinder cooperates with the positioning ring to clamp the core sample. Continue to pull upward. The first hook will squeeze the movable plate until the clamping plate releases and clamps the first hook. Continue to pull upward until the shear pin breaks. Then you can pull out the positioning cylinder, clamping cylinder, positioning ring and core sample. Slide the positioning ring downward. The clamping plate will gradually open and you can take out the core sample.

[0069] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0070] 1. The present invention provides a road coring device, which, by setting a positioning cylinder and a clamping cylinder inside the drilling cylinder, and setting a first bearing between the positioning cylinder and the drilling cylinder, provides a basis for the positioning cylinder and the clamping cylinder to be stationary relative to the drilling cylinder. By setting a limiting component to change the rotation state of the movable ring, the two work together to make the inner cylinder rotate relative to the drilling cylinder and the movable ring under the action of the first bearing, thereby separating the core sample from the rotating drilling cylinder, reducing the torque brought by the rotation of the drilling cylinder to the core sample, and preventing the core sample from being torn by twisting. Based on the limiting component, a material holding knife is set on the movable ring. Taking advantage of the characteristic that the movable ring can rotate relative to the drilling cylinder, a guide groove is set on the knife holder. The material holding knife and the guide groove cooperate to make the material holding knife unfold to cut the lower end of the core sample. The above structure works together to keep the core sample intact.

[0071] 2. The present invention provides a road coring device, which, by setting a positioning tooth assembly on a movable ring and setting a first positioning tooth under the clamping cylinder, during the forward rotation of the drilling cylinder driven by the first drive motor, due to the relative rotational relationship between the movable ring and the inner cylinder, the first positioning tooth will continuously squeeze the second positioning tooth of the limiting tooth resistance, thereby squeezing the first elastic element to press down the arc plate. During the reverse rotation of the first drive motor, the side wall of the first positioning tooth will abut against the side wall of the second positioning tooth, thereby restricting the movable ring from rotating with the drilling cylinder.

[0072] 3. The road coring device provided by the present invention has an arc-shaped guide groove on the inner side of the blade body. During the contact process between the material holding blade and the inner wall of the guide groove, the outward component force received by the material holding blade will become larger and larger, thereby causing the material holding blade to rotate and unfold.

[0073] 4. The present invention provides a road coring device, which, by setting a clamping cylinder and a positioning ring, firstly guides the path when the core sample enters, so that the core sample can smoothly enter the positioning cylinder. Secondly, during the extraction process, the clamping cylinder will retract inward to clamp the core sample, ensuring the stability of the coring process and reducing damage to the core sample. The positioning ring is used to keep the clamping cylinder in a clamping state on the core sample.

[0074] 5. The road core sampling device provided by the present invention uses a fixing component to clamp the first hook on the clamping plate, thereby fixing the position of the positioning ring and achieving stable clamping during the pulling out of the positioning ring.

[0075] 6. The road core sampling device provided by the present invention, by setting a first diversion part and a second diversion part on the cutter holder, diverts the soil fragments cut during drilling, thereby reducing interference with the drilling of the cutter head. Attached Figure Description

[0076] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0077] Figure 1 This is an axial sectional view of the core-taking module of the present invention;

[0078] Figure 2 This is a schematic diagram of the core extraction module of the present invention;

[0079] Figure 3 This is an exploded view of the core extraction module structure of the present invention;

[0080] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point I;

[0081] Figure 5 For the present invention Figure 1 Enlarged schematic diagram of the structure at point II;

[0082] Figure 6 This is a schematic diagram of the clamping cylinder structure of the present invention;

[0083] Figure 7 This is a schematic diagram of the structure of the movable ring and positioning tooth assembly of the present invention;

[0084] Figure 8 This is an axial sectional view of the positioning ring of the present invention;

[0085] Figure 9 This is an axial sectional view of the drilling cylinder of the present invention;

[0086] Figure 10 This is a schematic diagram of the bottom structure of the blade body of the present invention;

[0087] Figure 11 This is a schematic diagram of the upper structure of the blade body of the present invention;

[0088] Figure 12 This is a schematic diagram of the unfolded material-holding blade of the present invention;

[0089] Figure 13 This is an overall schematic diagram of the present invention after the movable body is connected;

[0090] Figure 14 This is a schematic diagram of the moving body structure of the present invention.

[0091] Figure label:

[0092] 1-Moving body, 101-Support frame, 102-Handle, 103-Roller, 104-Extension frame, 105-Positioning cone, 106-Support plate, 2-First drive motor, 3-Lifting module, 301-Lead screw, 302-Connecting seat, 303-Second drive motor, 304-Slider, 4-Coring module, 401-Drilling cylinder, 402-Mounting slot, 403-Limiting groove, 404-Through hole, 5-Mounting frame, 6-Mounting plate, 7-Cover, 8-Connecting shaft, 9-Cutter body, 901-Cutter holder, 902-Cutter head, 903-Transition slope, 904-First diversion section, 905-Second diversion section, 906-Guide groove, 907-Abutment groove 10-Positioning cylinder, 11-Positioning ring, 1101-Guide rail, 1102-Annular groove, 1103-Mounting hole, 12-Clamping plate, 1201-First hook, 1202-First positioning tooth, 13-Moving ring, 1301-Arc groove, 14-First bearing, 15-Second bearing, 16-First bolt, 17-Shearing pin, 18-Positioning tooth assembly, 1801-Arc plate, 1802-First elastic element, 1803-Second positioning tooth, 19-Material grabber, 20-Second hook, 21-Fixing assembly, 2101-Moving plate, 2102-Second elastic element, 2103-Clamping plate, 2104-Third elastic element, 22-Rotating rod. Detailed Implementation

[0093] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0094] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed when the invention is used. They are only for the convenience of describing this application and simplifying the description, and do not 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 application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0095] Example 1

[0096] A road core sampling device, such as Figures 1-3 , Figure 12 As shown, it includes:

[0097] Core extraction module 4, the core extraction module 4 comprising:

[0098] Drilling barrel 401, a first drive motor 2 is connected to the drilling barrel 401, and a cutter body 9 is provided at the lower end of the drilling barrel 401;

[0099] An inner cylinder is provided inside the drilling cylinder 401, and a first bearing 14 is detachably provided between the inner cylinder and the drilling cylinder 401.

[0100] The movable ring 13 is connected to the drilling barrel 401 via a second bearing 15. The lower end of the movable ring 13 is provided with a second hook 20, which can abut against the cutter body 9 to cause the drilling barrel 401 to drive the movable ring 13 to rotate.

[0101] A limiting component is provided between the movable ring 13 and the inner cylinder to limit the rotation of the movable ring 13;

[0102] Material-holding blade 19: Multiple material-holding blades 19 are rotatably provided at the lower end of the movable ring 13. The material-holding blades 19 can be deployed in conjunction with the inner side of the blade body 9.

[0103] like Figure 1 , Figure 2 , Figure 7 As shown, the outer and inner rings of the first bearing 14 are each provided with a first bolt 16. The drilling barrel 401 and the inner cylinder are each provided with several through holes 404. The first bolt 16 connects the outer ring or the inner ring of the first bearing 14 through the through holes 404. The first bolt 16 connects the outer and inner rings of the first bearing 14 to the drilling barrel 401 and the inner cylinder respectively, making the structure more stable during the rotation of the drilling barrel 401. Before taking out the core sample, the first bolt 16 on the drilling barrel 401 needs to be unscrewed to pull out the inner cylinder. During this process, the first bearing 14 is pulled out together. If the first bearing 14 needs to be replaced after taking out the core sample, the first bolt 16 on the inner cylinder can be unscrewed. In addition, an extension is provided at the lower end of the first bearing 14. A threaded hole is provided on the extension corresponding to the through hole 404. The first bolt 16 is engaged with the threaded hole.

[0104] like Figure 9As shown, the inner wall of the drilling barrel 401 is provided with an annular mounting groove 402. The outer ring of the second bearing 15 is installed in the mounting groove 402. The inner ring of the second bearing 15 is connected to the outer wall of the movable ring 13. The mounting groove 402 serves two purposes: one is to provide more space for installing the second bearing 15, and the other is to make the rotation of the second bearing 15 more stable.

[0105] like Figure 5 , Figure 7 , Figure 8 As shown, the limiting component includes:

[0106] The lower end of the inner cylinder is provided with a plurality of first positioning teeth 1202;

[0107] Positioning tooth assembly 18, the positioning tooth assembly 18 comprising:

[0108] Arc-shaped plate 1801, which is connected to the upper end of the movable ring 13 via a first elastic element 1802;

[0109] The second positioning teeth 1803 are provided on the arc-shaped plate 1801. The first positioning teeth 1202 and the second positioning teeth 1803 cooperate to allow the movable ring 13 to rotate in one direction relative to the inner cylinder. During the forward rotation of the drilling cylinder 401 driven by the first drive motor 2, due to the relative rotational relationship between the movable ring 13 and the inner cylinder, the first positioning teeth 1202 will continuously squeeze the second positioning teeth 1803, thereby squeezing the first elastic element 1802 and pressing down the arc-shaped plate 1801. At this time, the limiting component is released, thereby allowing the movable ring 13 to rotate in one direction relative to the inner cylinder. 13 and the inner cylinder rotate relative to each other. During the reverse rotation of the first drive motor 2, the side wall of the first positioning tooth 1202 will abut against the side wall of the second positioning tooth 1803, thereby restricting the movable ring 13 from rotating with the drilling cylinder 401. At this time, the material holding knife 19 rotates relative to the knife body 9. During this process, the outer side wall of the material holding knife 19 will gradually cooperate with the arc-shaped inner wall of the knife body 9, and finally complete the unfolding of the material holding knife 19. In addition, in order to ensure the stability of the first elastic element 1802, an arc-shaped groove 1301 is opened at the upper end of the movable ring 13, and the arc-shaped plate 1801 is located in the arc-shaped groove 1301.

[0110] like Figure 11As shown, the inner side of the cutter body 9 has an arc-shaped guide groove 906 along the circumference. The material holding cutter 19 is arc-shaped. The outer wall of the material holding cutter 19 can abut against the inner wall of the guide groove 906 and unfold the material holding cutter 19. The inner wall of the guide groove 906 is also arc-shaped. During the contact process between the material holding cutter 19 and the inner wall of the guide groove 906, the outward component force it receives will become larger and larger, thereby causing the material holding cutter 19 to rotate and unfold. In the default state, that is, before the cutter body 9 and the drilling cylinder 401 drill, the material holding cutter 19 is retracted to the lower end of the movable ring 13 to avoid affecting the core taking.

[0111] In this embodiment, as Figure 8 , Figure 9 As shown, the inner wall of the drilling tube 401 is provided with multiple vertical limiting grooves 403 in the axial direction, and the outer wall of the movable ring 13 is provided with a guide rail 1101 corresponding to the limiting groove 403. The guide rail 1101 is slidably engaged with the limiting groove 403.

[0112] In this embodiment, as Figure 2 As shown, a cover 7 is detachably connected to the upper end of the drilling cylinder 401. A connecting shaft 8 is provided on the cover 7, and the connecting shaft 8 is connected to the output shaft of the first drive motor 2.

[0113] In this embodiment, as Figure 4 As shown, the material-holding knife 19 has a rotating rod 22 at one end and a hinge hole at the lower end of the movable ring 13. The rotating rod 22 and the hinge hole cooperate to realize the rotation of the material-holding knife 19.

[0114] In this embodiment, the first drive motor 2 drives the drilling cylinder 401 to rotate, thereby driving the cutter body 9 to drill into the foundation. During this process, the core sample to be retrieved enters the inner cylinder, which then clamps and fixes the core sample during subsequent retrieval. The limiting component changes the relative rotation state between the movable ring 13 and the inner cylinder. Specifically, when the first drive motor 2 rotates in the forward direction, i.e., during drilling, the rotation of the drilling cylinder 401 drives the cutter body 9 to rotate until one side of the cutter body 9 abuts against the second hook 20. Therefore, the rotation of the drilling cylinder 401 and the abutment between the cutter body 9 and the second hook 20 in the rotational direction are considered as follows: When the drilling barrel 401 is in use, it will drive the movable ring 13 to rotate. At this time, the limiting component does not restrict the rotation of the movable ring 13. The inner cylinder set on the movable ring 13 is heavy. After the core sample enters the inner cylinder, there is friction between the core sample and the inner wall of the inner cylinder. The two work together to make the inner cylinder rotate relative to the drilling barrel 401 and the movable ring 13 under the action of the first bearing 14. This separates the core sample from the rotating drilling barrel 401, so that the core sample remains relatively stationary. It can be regarded as the core sample and the drilling barrel 401 are in a relative rotational relationship, thereby reducing the torque brought by the rotation of the drilling barrel 401 to the core sample and preventing the core sample from being torn by the torsion.

[0115] In addition, before the core sample is removed, the first drive motor 2 will rotate in the opposite direction. The reverse rotation of the first drive motor 2 will drive the drilling cylinder 401 to rotate in the opposite direction. At this time, the cutter body 9 and the second hook 20 will disengage. During this process, the side wall of the material holding cutter 19 will gradually abut against the inner side of the cutter body 9, generating a component force that drives the material holding cutter 19 to rotate toward the center of the drilling cylinder 401. During the continuous reverse rotation, the material holding cutter 19 gradually unfolds to cut the foundation, making it easier to break the core sample when the inner cylinder is lifted in the future.

[0116] Secondly, in this embodiment, both the first bearing 14 and the second bearing 15 are deep groove ball bearings to satisfy the relative rotation between the inner cylinder and the drilling barrel 401, as well as between the movable ring 13 and the drilling barrel 401.

[0117] Example 2

[0118] The difference between this embodiment and Embodiment 1 is that, as Figure 5 As shown, the first positioning tooth 1202 is an inverted right triangle, and the second positioning tooth 1803 is an upright right triangle.

[0119] In this embodiment, when the first positioning tooth 1202 and the second positioning tooth 1803 abut, the right-angled sides of the first positioning tooth 1202 and the second positioning tooth 1803 abut, thereby restricting the rotation of the movable ring 13. When rotating in the forward direction, the inclined sides of the first positioning tooth 1202 and the second positioning tooth 1803 contact, thereby generating a component force that presses down on the arc plate 1801, thereby realizing the relative rotation of the movable ring 13 and the inner cylinder.

[0120] Example 3

[0121] The difference between this embodiment and Embodiment 2 is that, as Figure 1 , Figure 6 As shown, the inner cylinder includes:

[0122] Positioning cylinder 10;

[0123] The clamping cylinder is formed by multiple clamping plates 12. The upper diameter of the clamping cylinder is the same as the diameter of the positioning cylinder 10, and the lower diameter is larger than the diameter of the positioning cylinder 10. A gap is left between two adjacent clamping plates 12. The first positioning tooth 1202 is provided at the lower end of the clamping plate 12.

[0124] In this embodiment, a gap is provided between two adjacent clamping plates 12. The main purpose of this gap is to provide the clamping plates 12 with a space for inward clamping. The positioning cylinder 10 is cylindrical, and its inner diameter is the same as the inner diameter of the movable ring 13. It should also be noted that the width of the cutter body 9 is the same as the sum of the wall thickness of the drilling cylinder 401 and the wall thickness of the movable ring 13. That is, the width of the cutter body 9 just covers the drilling cylinder 401 and the movable ring 13. Therefore, the diameter of the core sample depends on the inner diameter of the movable ring 13. When the core sample enters the positioning cylinder 10, its inner diameter just accommodates the core sample, and the diameter of the core sample is also the same as that of the positioning cylinder 10, which is beneficial for subsequent removal. In addition, the clamping cylinder has two purposes: one is to guide the path when the core sample enters, so that the core sample can smoothly enter the positioning cylinder 10; the other is that during the removal process, the clamping cylinder will retract inward to clamp the core sample, ensuring the stability of the core removal process and reducing damage to the core sample.

[0125] Example 4

[0126] The difference between this embodiment and embodiment 3 is that, as Figure 1 , Figure 3 , Figure 8 As shown, the inner cylinder also includes:

[0127] The positioning ring 11 is slidably disposed inside the drilling barrel 401, and the inner wall of the positioning ring 11 is provided with an inclined surface along the axial direction. The inner diameter of the upper end of the clamping barrel is smaller than the outer diameter of the lower end of the clamping barrel. The outer wall of the clamping plate 12 is provided with a first hook 1201 that can cooperate with the positioning ring 11. A shear pin 17 is connected between the positioning ring 11 and the drilling barrel 401.

[0128] In this embodiment, the function of the positioning ring 11 is to retract the clamping cylinder. Specifically, when the positioning cylinder 10 is pulled outward, the positioning cylinder 10 drives the clamping cylinder to move until the clamping cylinder comes into contact with the inner wall of the positioning ring 11. During the continuous outward movement, since the lower end of the clamping cylinder is in an outward expansion shape, the contact force between it and the inner wall of the clamping cylinder is greater, and the force that drives each clamping plate 12 to retract is greater, ultimately achieving the clamping of the core sample. During the continuous outward movement, the force on the shear pin 17 increases until it breaks, at which point the positioning cylinder 10 and the clamping cylinder can be pulled out. The purpose of the first hook 1201 is to cooperate with the positioning ring 11 during the pulling out process to produce a better clamping effect.

[0129] Furthermore, after the clamping plates 12 are fully close to clamp the core sample, the gap between two adjacent clamping plates 12 can be considered closed. In this state, the outer diameter of the lower end of the clamping cylinder is still larger than the inner diameter of the upper end of the positioning ring 11, thereby preventing the outer diameter of the clamping plates 12 from being smaller than the inner diameter of the upper end of the positioning ring 11 after the clamping plates 12 are further closed under the action of tension, which would cause slippage.

[0130] Example 5

[0131] The difference between this embodiment and embodiment 4 is that, as Figure 8 As shown, the lower end of the positioning ring 11 is provided with a fixing component 21, the fixing component 21 including:

[0132] The movable plate 2101 has an annular groove 1102 at the lower end of the positioning ring 11 for the first hook 1201 to be inserted. The movable plate 2101 is disposed in the annular groove 1102 and a second elastic element 2102 is connected between the movable plate 2101 and the annular groove 1102.

[0133] A clamping plate 2103 is provided, and a third elastic element 2104 is connected between the clamping plate 2103 and the side wall of the annular groove 1102. The movable plate 2101 abuts against the clamping plate 2103.

[0134] In this embodiment, during the pulling out of the positioning cylinder 10 and the clamping cylinder, friction between the positioning ring 11 and the drilling cylinder 401 may cause relative slippage between the positioning ring 11 and the clamping cylinder. Therefore, the fixing component 21 ensures that the positioning ring 11 remains relatively stationary with respect to the clamping cylinder during the pulling out of the positioning cylinder 10 and the clamping cylinder, thereby improving clamping stability. In addition, the movable plate 2101 and the clamping plate 2103 are vertically arranged, and the clamping plate 2103 is located on one side of the movable plate 2101. By default, the side of the movable plate 2101 will abut against the clamping plate 2103, causing the third elastic member 2... 104 is in a compressed state. Specifically, during the pulling out of the clamping cylinder, the first hook 1201 will enter the annular groove 1102 and then squeeze the movable plate 2101. During the continuous pulling out, the first hook 1201 further squeezes the movable plate 2101 until the movable plate 2101 is squeezed to be misaligned with the clamping plate 2103. At this time, under the action of the third elastic element 2104, the side clamping plate 2103 is pushed towards the first hook 1201 to squeeze the first hook 1201, thereby fixing the position of the positioning ring 11 and achieving stable clamping during the pulling out of the positioning ring 11.

[0135] Furthermore, in this embodiment, four guide rails 1101 are evenly distributed around the outer wall of the positioning ring 11, and four limiting grooves 403 are also provided in the corresponding drilling cylinder 401. An installation hole 1103 is opened in the annular groove 1102 corresponding to each guide rail 1101. The third elastic member 2104 is provided in the installation hole 1103, thereby increasing the elongation and compression range of the third elastic member 2104, which facilitates providing a more stable clamping force for the first hook 1201.

[0136] Example 6

[0137] The difference between this embodiment and embodiment 5 is that, as Figure 10 , Figure 11 As shown, the blade body 9 includes:

[0138] The tool holder 901 is located at the lower end of the drilling cylinder 401. The guide groove 906 is located inside the tool holder 901. The tool holder 901 has a first diversion part 904 and a second diversion part 905 on both sides.

[0139] The cutter head 902 is embedded on the cutter holder 901.

[0140] The cutter holder 901 is also provided with a transition slope 903, which is conducive to the removal of soil fragments during drilling.

[0141] The tool holder 901 also has an abutment groove 907. One end of the abutment groove 907 passes through the tool holder 901, while the other end does not. During the process of the material holding knife 19 cooperating with the guide groove 906, the limiting of the abutment groove 907 improves the stability of the unfolding of the material holding knife 19. Secondly, during the forward rotation of the first drive motor 2, the second hook 20 will be inserted into the abutment groove 907 until it abuts against the side wall of the non-penetrating end of the abutment groove 907.

[0142] In this embodiment, the first diversion section 904 and the second diversion section 905 serve to divert the soil fragments cut during drilling, reducing interference with the drilling of the cutter head 902. Furthermore, the cutter head 902 is made of hard alloy material, with a pointed tip for drilling. Additionally, this embodiment allows for a groove on the inner wall of the non-penetrating end of the abutment groove 907 to engage with the second hook 20, increasing the contact area between the second hook 20 and the cutter holder 901. Secondly, the abutment groove 907, corresponding to the forward rotation end of the drilling cylinder 401, does not penetrate the cutter holder 901, allowing the second hook 20 to contact the abutment groove 907, thus facilitating the rotation of the cutter body 9 along with the drilling cylinder 401.

[0143] Example 7

[0144] The difference between this embodiment and the above embodiments is that, as Figure 13 , Figure 14 As shown, it also includes:

[0145] A movable body 1, wherein a positioning cone 105 is provided at the lower end of the movable body 1;

[0146] The lifting module 3 is mounted on the moving body 1 and connected to the first drive motor 2.

[0147] The mobile body 1 includes:

[0148] A support frame 101 is provided, and a support plate 106 is connected between the support frames 101. A handle 102 is provided at the upper end of the support frame 101. The lifting module 3 is provided on one side of the support frame 101, and a roller 103 is provided on the other side of the support frame 101.

[0149] An extension frame 104 is provided on the side of the support frame 101 opposite to the roller 103. There are two extension frames 104 located at the left and right ends of the support frame 101. The support frame 101 is L-shaped. The positioning cone 105 is provided at the lower end of both the support frame 101 and the lower end of the extension frame 104.

[0150] The lifting module 3 includes:

[0151] The second drive motor 303 is located on one side of the support frame 101;

[0152] Lead screw 301, one end of which is connected to the output end of the second drive motor 303;

[0153] The slider 304 is threadedly engaged with the lead screw 301 and slidably connected to the support plate 106. One side of the slider 304 is connected to the mounting plate 6, and one side of the mounting plate 6 is equipped with a mounting bracket 5. The first drive motor 2 is mounted on the mounting bracket 5.

[0154] A connecting seat 302 is provided on the support frame 101, and the other end of the lead screw 301 is rotatably engaged with the connecting seat 302.

[0155] In this embodiment, during the core drilling process, the support frame 101 is in a vertical position, and the positioning cone 105 is inserted into the foundation to ensure stability. During this process, the roller 103 does not contact the ground. During the movement, the handle 102 is pulled to tilt the support frame 101, and then the roller 103 is used to move the support frame 101. The slider 304 moves up and down by means of the screw 301 and slider 304 structure. The movement of the slider 304 drives the mounting plate 6, the mounting frame 5 and the first drive motor 2 to move up and down, thereby realizing the raising and lowering of the core module 4.

[0156] Secondly, in this embodiment, a second drive motor 303 is provided at both the left and right ends of the support frame 101, and each second drive motor 303 is provided with a lead screw 301, and each lead screw 301 is provided with two sliders 304, thereby improving the stability of the lifting process.

[0157] Example 8

[0158] A road core sampling method includes the following steps:

[0159] S1: Move the moving body 1 to the position where the core is to be removed, keep the core removal module 4 vertical and fix the moving body 1;

[0160] Step S1 includes a moving process and a fixing process. The moving process is that a person manually operates the handle 102 to tilt the support frame 101 and make the roller 103 contact the ground, thereby transferring the object. The fixing process is that the support frame 101 is adjusted to be vertical so that the positioning cone 105 is inserted into the ground, thereby fixing the entire moving body 1.

[0161] S2: Adjust the material holding knife 19 to the retracted state, start the first drive motor 2 and the second drive motor 303 to drive the drilling barrel 401 to rotate and the core taking module 4 to descend, until the drilling reaches the designated position and then stop the first drive motor 2 and the second drive motor 303. During this process, the drilling barrel 401 and the movable ring 13 rotate synchronously.

[0162] In step S2, the second hook 20 is adjusted to abut against the abutment groove 907, at which point the material-holding knife 19 is just located in the guide groove 906;

[0163] S3: Control the first drive motor 2 to reverse, the drilling cylinder 401 and the movable ring 13 rotate relative to each other, the material holding knife 19 will cooperate with the guide groove 906 on the knife holder 901 and gradually unfold and cut the lower end of the core sample. After it is fully unfolded, the first drive motor 2 stops.

[0164] In step S3, when the first drive motor 2 reverses, the second hook 20 no longer contacts the knife holder 901. At this time, the outer side of the material holding knife 19 gradually abuts against the guide groove 906, thereby causing the material holding knife 19 to unfold and cut the foundation.

[0165] S4: Remove the cover 7 and pull the positioning cylinder 10 outward. The positioning cylinder 10 drives the clamping cylinder to rise synchronously until the inner wall of the clamping cylinder cooperates with the positioning ring 11 to clamp the core sample. Continue to pull upward, and the first hook 1201 squeezes the movable plate 2101 until the clamping plate 2103 releases and clamps the first hook 1201. Continue to pull upward until the shear pin 17 breaks, and the positioning cylinder 10, clamping cylinder, positioning ring 11 and core sample can be pulled out. Slide the positioning ring 11 downward, and the clamping plate 12 gradually opens, and the core sample can be taken out.

[0166] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A road core sampling device, characterized in that, include: Core extraction module (4), the core extraction module (4) includes: A drilling barrel (401) is provided with a first drive motor (2) connected to the drilling barrel (401), and a cutter body (9) is provided at the lower end of the drilling barrel (401). The inner cylinder is located inside the drilling cylinder (401), and a first bearing (14) is detachably provided between the inner cylinder and the drilling cylinder (401). The movable ring (13) is connected to the drilling barrel (401) via a second bearing (15). The lower end of the movable ring (13) is provided with a second hook (20). The second hook (20) can abut against the cutter body (9) to make the drilling barrel (401) drive the movable ring (13) to rotate. A limiting component is provided between the movable ring (13) and the inner cylinder to limit the rotation of the movable ring (13); The limiting component includes: The lower end of the inner cylinder is provided with a plurality of first positioning teeth (1202). Positioning tooth assembly (18), the positioning tooth assembly (18) comprising: An arc-shaped plate (1801) is connected to the upper end of the movable ring (13) via a first elastic element (1802); The second positioning tooth (1803) is provided on the arc plate (1801). The first positioning tooth (1202) and the second positioning tooth (1803) cooperate to make the movable ring (13) rotate in one direction relative to the inner cylinder. Material holding knife (19), multiple material holding knives (19) are rotatably provided at the lower end of the movable ring (13). The inner side of the knife body (9) has an arc-shaped guide groove (906) along the circumferential direction. The material holding knife (19) is arc-shaped. The outer wall of the material holding knife (19) can abut against the inner wall of the guide groove (906) and make the material holding knife (19) unfold.

2. The road coring device according to claim 1, characterized in that, The inner cylinder includes: Positioning cylinder (10); The clamping cylinder is formed by multiple clamping plates (12). The upper diameter of the clamping cylinder is the same as the diameter of the positioning cylinder (10), and the lower diameter is larger than the diameter of the positioning cylinder (10). There is a gap between two adjacent clamping plates (12). The first positioning tooth (1202) is located at the lower end of the clamping plate (12).

3. A road core sampling device according to claim 2, characterized in that, The inner cylinder also includes: The positioning ring (11) is slidably disposed inside the drilling barrel (401), and the inner wall of the positioning ring (11) is provided with an inclined surface along the axial direction. The inner diameter of the upper end of the clamping barrel is smaller than the outer diameter of the lower end of the clamping barrel. The outer wall of the clamping plate (12) is provided with a first hook (1201) that can cooperate with the positioning ring (11). A shear pin (17) is connected between the positioning ring (11) and the drilling barrel (401).

4. A road coring device according to claim 3, characterized in that, The lower end of the positioning ring (11) is provided with a fixing component (21), the fixing component (21) including: The movable plate (2101) has an annular groove (1102) at the lower end of the positioning ring (11) for inserting the first hook (1201). The movable plate (2101) is located in the annular groove (1102) and a second elastic element (2102) is connected between the movable plate (2101) and the annular groove (1102). A clamping plate (2103) is connected to the side wall of the annular groove (1102) by a third elastic element (2104), and the movable plate (2101) abuts against the clamping plate (2103).

5. A road core sampling device according to claim 1, characterized in that, The blade (9) includes: The tool holder (901) is located at the lower end of the drilling cylinder (401), the guide groove (906) is located inside the tool holder (901), and the tool holder (901) has a first diversion part (904) and a second diversion part (905) on both sides respectively. The cutter head (902) is embedded in the cutter holder (901).

6. A road coring device according to claim 1, characterized in that, The upper end of the drilling tube (401) is detachably connected to a cover (7), and the cover (7) is provided with a connecting shaft (8), which is connected to the output shaft of the first drive motor (2).

7. A road coring device according to claim 1, characterized in that, Also includes: The moving body (1) has a positioning cone (105) at its lower end. The lifting module (3) is mounted on the moving body (1) and connected to the first drive motor (2).

8. A road core sampling method, implemented using a road core sampling device according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Move the moving body (1) to the position where the core is to be removed, keep the core removal module (4) vertical and fix the moving body (1); S2: Adjust the material holding knife (19) to be in the retracted state, start the first drive motor (2) and the second drive motor (303) to drive the drilling barrel (401) to rotate and the core module (4) to descend, until the drilling reaches the designated position and then stop the first drive motor (2) and the second drive motor (303). During this process, the drilling barrel (401) and the movable ring (13) rotate synchronously. S3: Control the first drive motor (2) to reverse, the drilling cylinder (401) and the movable ring (13) rotate relative to each other, the material holding knife (19) will cooperate with the guide groove (906) on the knife holder (901) and gradually unfold and cut the lower end of the core sample. After it is fully unfolded, the first drive motor (2) stops. S4: Remove the cover (7), pull the positioning cylinder (10) outward, the positioning cylinder (10) drives the clamping cylinder to rise synchronously until the inner wall of the clamping cylinder cooperates with the positioning ring (11) to clamp the core sample. Continue to pull upward, the first hook (1201) squeezes the movable plate (2101) until the clamping plate (2103) releases and clamps the first hook (1201). Continue to pull upward until the shear pin (17) breaks, and the positioning cylinder (10), clamping cylinder, positioning ring (11) and core sample can be pulled out. Slide the positioning ring (11) downward, the clamping plate (12) gradually opens, and the core sample can be taken out.

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