A downhole soil sampling device for collapsible loess exploration well

Abstract

The application relates to the technical field of exploration well sampling, and discloses a downhole soil sampling device for collapsible loess exploration wells, which comprises a sampling mechanism and a lifting mechanism for lifting and driving the sampling mechanism, the lifting mechanism comprises a portal frame, a control box is arranged on one side of the portal frame, a winding machine is fixedly arranged at the top of the portal frame, and the winding end of the winding machine is connected with the sampling mechanism through a rope. The downhole soil sampling device for collapsible loess exploration wells can extract loess on the inner wall of the well through the arrangement of a sampling piece, the arrangement of a positioning piece is used for locking a protective shell during sampling, the stability of the sampling mechanism during soil sampling is ensured, the arrangement of an electric cylinder can not only drive the extension of the sampling piece to form a sampling work, but also synchronously drive the extension of the positioning piece to form a positioning work of a sampling position, the downhole soil sampling device has good linkage function, and the smoothness of downhole soil sampling is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of exploration well sampling, and particularly relates to a downhole soil sampling device for collapsible loess exploration wells. BACKGROUND

[0002] Collapsible loess refers to soil that is subjected to significant additional deformation due to the destruction of the structure of the soil after immersion under the action of the self-weight stress of the overlying soil or under the combined action of the self-weight stress and additional stress, and has collapsibility; in engineering and scientific research, in order to investigate geology, the loess of an exploration well generally needs to be sampled and studied, and the traditional exploration well sampling operation is generally a manual downhole excavation mode to take out the soil sample. According to the search, the Chinese patent with the publication number CN112729907B discloses a downhole automatic soil sampling device for collapsible loess exploration wells, which comprises a sampling device and a hoisting device for placing the sampling device in the downhole, and the sampling device comprises a protective shell, a sampling structure arranged in the protective shell and a pushing structure. Through the above technical scheme, when the pressure sensor detects that the sampling cutter group has too large resistance during movement, the controller controls the second relay to be disconnected, so that the power supply circuit of the driving assembly is cut off, and then the sampling cutter group stops sampling to protect the sampling cutter group.

[0003] The downhole automatic soil sampling device described above moves the sampling mechanism into the exploration well through the hoisting device, and then performs excavation sampling work on the inner wall of the well through the sampling mechanism. However, the soil sampling equipment has certain defects in actual operation, such as the need to limit the sampling mechanism at a specified height through the independently arranged fixing mechanism, and then to move the sampling cutter group to the side to move out of the shell through the pushing mechanism to form the sampling work. In the operation process, the continuity is lacking, the orderliness during sampling is reduced, and through the above sampling mode, only single-direction loess can be sampled, different direction sampling work cannot be performed according to different needs, and the use effect of the equipment is reduced. SUMMARY

[0004] (I) Technical problem solved

[0005] In view of the deficiencies of the prior art, the application provides a downhole soil sampling device for collapsible loess exploration wells. Through the arrangement of the sampling piece, the loess of the inner wall of the well can be extracted. Through the arrangement of the positioning piece, the protective shell during sampling is locked to ensure the stability of the sampling mechanism during soil sampling. Through the arrangement of the electric cylinder, the sampling piece can be driven to extend to form the sampling work, and the positioning piece can be driven to extend to form the positioning work of the sampling position, so that the linkage function is good, the smoothness of the downhole soil sampling is improved, and the problems that the existing soil sampling equipment lacks continuity during operation and can only perform single-direction sampling work, so that the use effect is poor are solved.

[0006] (II) Technical Solution

[0007] To achieve the above object, the application provides the following technical solution: a downhole soil sampling device for collapsible loess exploration well, comprising a sampling mechanism and a lifting mechanism for driving the sampling mechanism to ascend and descend, wherein the lifting mechanism comprises a portal frame, a control box is installed on one side of the portal frame, a winding machine is fixedly installed on the top of the portal frame, the winding end of the winding machine is connected with the sampling mechanism through a rope, the sampling mechanism comprises a cylindrical protective shell, and an extension opening is formed in the bottom of the protective shell.

[0008] The inside of the protective shell is provided with a sampling member with propulsion and rotation functions, a positioning member for positioning the sampling mechanism in the well, and an electric cylinder for driving the sampling member and the positioning member.

[0009] Preferably, a U-shaped frame is fixedly connected to the inner bottom of the protective shell, and the electric cylinder is fixed to the top of the U-shaped frame.

[0010] The sampling member comprises a connecting plate, the bottom of the connecting plate is provided with an electric guide rail member for transverse driving, and a soil sampling shovel cylinder is fixedly installed at the driving end of the electric guide rail member.

[0011] Preferably, a driving motor for rotation adjustment of the electric guide rail member is fixedly connected to the bottom of the connecting plate, and the output shaft of the driving motor is fixedly connected with the electric guide rail member.

[0012] Preferably, the positioning member comprises at least two guide blocks slidingly connected to the inside of the U-shaped frame, the bottom of each of the two guide blocks is fixed to the top of the connecting plate, the top of each of the two guide blocks is hingedly connected with an inclined positioning strip block, two first movable openings are formed in the outer surface of the protective shell, and the bottom end of each of the two positioning strip blocks extends to the outside of the protective shell through the first movable opening.

[0013] Preferably, an arc-shaped abutting plate is hingedly connected to the bottom end of each of the two positioning strip blocks, and a plurality of positioning anchor rods are fixedly connected to the outer side of each of the two arc-shaped abutting plates.

[0014] A limiting rod is fixedly connected to the inside of each of the two first movable openings, and a strip-shaped guide opening is formed in the inside of each of the two positioning strip blocks, and each of the two strip-shaped guide openings is movably sleeved on the outer surface of each of the two limiting rods.

[0015] Preferably, an anti-falling assembly is arranged in the inside of the protective shell, and the anti-falling assembly is connected with the bottom end of the rope through a suspension member.

[0016] The anti-falling assembly is used for, when the rope is broken, suspending and locking the sampling mechanism through the abutting contact between itself and the inner wall of the well.

[0017] Preferably, the anti-falling assembly comprises a gravity block arranged at the top of the protective shell, the outer edge of the bottom of the gravity block is hinged with a plurality of inclined transmission frames, and the outer surface of the protective shell is provided with a plurality of second movable openings for the bottom end of the transmission frame to extend to the outside of the protective shell, the inside of the plurality of second movable openings is fixedly connected with guide columns, the bottom end of the plurality of transmission frames respectively extends to the outside of the protective shell through the plurality of second movable openings, and the plurality of transmission frames are all provided with inclined strip-shaped movable openings.

[0018] The bottom end of the plurality of transmission frames is hinged with an arc-shaped friction plate, and the outer side of the plurality of arc-shaped friction plates is provided with a protective pattern.

[0019] Preferably, the suspension comprises a connecting shaft slidingly connected to the top of the protective shell, the bottom end of the connecting shaft extends to the inside of the protective shell and is fixedly connected with the top of the gravity block, the top end of the connecting shaft is connected with a hanging ring, and the rope is connected with the hanging ring through a hook.

[0020] (Three) beneficial effects

[0021] Compared with the prior art, the present application provides a downhole soil sampling device for collapsible loess exploration well, which has the following beneficial effects:

[0022] 1、The protective shell arranged in the sampling mechanism is used for protecting the sampling part and the positioning part, preventing the collapse damage problem in the sampling process, the loess on the inner wall of the well can be extracted through the arrangement of the sampling part, the protective shell during sampling is locked through the arrangement of the positioning part, ensuring the stability of the sampling mechanism during soil sampling, the electric cylinder is arranged, which can not only drive the extension of the sampling part to form the sampling work, but also can drive the extension of the positioning part to form the positioning work of the sampling position, having good linkage function, thereby improving the smoothness and safety of the downhole soil sampling.

[0023] 2、The gravity block is connected with the rope through the suspension, so that when the rope breaks, the gravity block will move downward quickly, driving the fan-shaped movement of the plurality of inclined transmission frames, and the fan-shaped movement of the plurality of transmission frames can be extended through the plurality of second movable openings, the arc-shaped friction plate is arranged to abut against the inner wall of the well to form the anti-falling work of the sampling mechanism, solving the problem that the sampling device in the prior art breaks down when sampling in the well due to the special environment and long-term use, causing the rope to break.

[0024] 3、The hollow ball rolls in the inside of the half ball shell, and the hanging ring is inclined at different angles, the gravity block is arranged at the inner bottom of the hollow ball, when the rope is broken or the hook is unhooked, and the sampling mechanism is inclined at different angles, the hanging ring is always in the vertical state through the vertical downward of the gravity block, the subsequent worker can hang the hook, the sampling mechanism is inclined in the well when the rope is broken, the hanging ring is inclined, the subsequent hanging work is affected, and the sampling mechanism is taken out of the well. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of the collapsible loess exploration well downhole soil sampling device.

[0026] Figure 2 It is a structure schematic view of the protective shell in the present application. Figure 1

[0027] Figure 3 It is a sectional view of the protective shell in the present application. Figure 1

[0028] Figure 4 It is a combination schematic view of the sampling piece, the positioning piece and the anti-falling assembly in the present application. Figure 3

[0029] It is a combination schematic view of the sampling piece and the positioning piece in the present application. Figure 5 Figure 4

[0030] Figure 6 It is a combination bottom view of the sampling piece and the positioning piece in the present application. Figure 5

[0031] It is a structure schematic view of the anti-falling assembly in the present application. Figure 7 Figure 4 It is a structure schematic view of the ring-shaped frame in the present application.

[0032] Figure 8 Figure 7 It is a combination schematic view of the anti-falling assembly and the hanging piece in the present application.

[0033] Figure 9 It is a sectional view of the hanging piece in the present application. Figure 7

[0034] Figure 10 Figure 9

[0035] In the figure: 1, gantry frame; 2, control box; 3, winding machine; 4, rope;

[0036] ​​​​​​​​​5, protective shell; 51, electric cylinder; 52, U-shaped frame;

[0037] 53, sampling member; 531, connecting plate; 532, electric guide rail member; 533, driving motor; 534, soil sampling shovel cylinder;

[0038] 54, positioning member; 541, guide block; 542, positioning strip block; 543, arc-shaped abutting plate; 544, positioning anchor rod; 545, limiting rod;

[0039] 6, anti-falling assembly; 61, gravity block; 62, transmission frame; 63, guide column; 64, arc-shaped friction plate; 65, annular frame; 66, blocking shaft;

[0040] 7, suspension member; 71, connecting shaft; 72, hanging ring; 73, hemispherical shell; 74, hollow ball; 75, gravity block; 76, bolt hole. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] Embodiment 1:

[0043] Referring to the drawings Figures 1-10 A downhole soil sampling device for collapsible loess exploration well, comprising a sampling mechanism and a lifting mechanism for driving the sampling mechanism to ascend and descend, the lifting mechanism comprising a portal frame 1, a control box 2 being installed on one side of the portal frame 1, a winding machine 3 being fixedly installed on the top of the portal frame 1, a winding end of the winding machine 3 being connected with the sampling mechanism through a rope 4, the sampling mechanism comprising a cylindrical protective shell 5, and an extension opening being formed in the bottom of the protective shell 5;

[0044] The portal frame 1 is arranged to erect and install the winding machine 3 and the sampling mechanism directly above the loess exploration well, the winding machine 3 adopts a winding device in the prior art, which is composed of a reversible motor, a winding drum and the rope 4. The winding drum is driven to rotate by the motor, so as to drive the rope 4 to perform winding and unwinding movement, and then drive the sampling mechanism to move up and down, thereby forming sampling work in the well.

[0045] The inside of the protective shell 5 is provided with a sampling member 53 having a propelling and rotating function, a positioning member 54 for positioning the sampling mechanism in the well, and an electric cylinder 51 for driving the sampling member 53 and the positioning member 54.

[0046] The protective shell 5 is provided in the sampling mechanism, which is used for protecting the sampling part 53 and the positioning part 54, preventing the collapse damage problem in the sampling process, through the setting of the sampling part 53, the loess on the well wall can be extracted, through the setting of the positioning part 54, the protective shell 5 during sampling is locked, which ensures the stability of the sampling mechanism during soil sampling, through the setting of the electric cylinder 51, not only the sampling part 53 can be driven to extend and form the sampling work, but also the positioning part 54 can be driven to extend and form the positioning work of the sampling position, which has good linkage function, and further improves the smoothness of the underground soil sampling.

[0047] Refer to the attached drawings Figures 3 to 6 The inner bottom of the protective shell 5 is fixedly connected with a U-shaped frame 52, and the electric cylinder 51 is fixed to the top of the U-shaped frame 52.

[0048] Through the setting of the U-shaped frame 52, the electric cylinder 51 is fixedly installed in the interior of the protective shell 5.

[0049] The sampling part 53 comprises a connecting plate 531, the bottom of the connecting plate 531 is provided with a horizontal driving electric guide rail part 532, and the driving end of the electric guide rail part 532 is fixedly installed with a soil sampling shovel cylinder 534.

[0050] The telescopic end of the electric cylinder 51 is fixedly connected with the top of the connecting plate 531, which is convenient for driving the sampling part 53 to perform telescopic motion through the electric cylinder 51, forming the sampling or storage protection work;

[0051] The electric guide rail part 532 adopts the electric mobile guide rail in the prior art, which is used for driving the soil sampling shovel cylinder 534 to move horizontally, through the horizontal movement of the soil sampling shovel cylinder 534 to the well wall, and through the continuous feeding, the soil sampling shovel cylinder 534 can be inserted into the loess on the well wall, forming the sampling work.

[0052] Refer to the attached drawings Figure 5 and Figure 6 The bottom of the connecting plate 531 is fixedly connected with a driving motor 533 for rotating adjustment of the electric guide rail part 532, and the output shaft of the driving motor 533 is fixedly connected with the electric guide rail part 532.

[0053] The driving motor 533 is connected with the power supply and control switch of the external environment, which is a forward and reverse motor, and is set in the connection mode and coding mode in the prior art, which is used for driving the telescopic end of the electric guide rail part 532 to rotate and adjust, and further perform the soil sampling work in different directions.

[0054] Refer to the attached drawings Figure 5 and Figure 6The positioning member 54 comprises at least two guide blocks 541 slidably connected to the inside of the U-shaped frame 52, the bottom of each of the two guide blocks 541 is fixed to the top of the connecting plate 531, and the top of each of the two guide blocks 541 is hingedly provided with an inclined positioning strip block 542, the outer surface of the protective shell 5 is provided with two first movable openings, and the bottom end of each of the two positioning strip blocks 542 extends to the outside of the protective shell 5 through the first movable opening;

[0055] The guide blocks 541 are arranged to improve the guiding of the up-down movement of the connecting plate 531, and to facilitate the up-down movement of the connecting plate 531, so that the two inclined positioning strip blocks 542 can be driven to fan-shaped movement synchronously, and the fan-shaped expansion of the two positioning strip blocks 542 can be inserted into the loess of the well wall, forming a self-locking work of the protective shell 5, effectively transmitting the extension driving force of the sampling member 53, realizing the linkage work, forming the synchronous operation of sampling and fixing, and improving the order of sampling and fixing, without separately controlling the sampling work and the fixing work, and further improving the convenience of operation.

[0056] Referring to the accompanying Figure 5 and Figure 6 The bottom end of each of the two positioning strip blocks 542 is hingedly provided with an arc-shaped abutting plate 543, and the outer side surface of each of the two arc-shaped abutting plates 543 is fixedly connected with a plurality of positioning anchor rods 544.

[0057] The arc-shaped abutting plates 543 are arranged to abut against the well wall, so as to ensure the stability of the protective shell 5 during sampling, and the plurality of positioning anchor rods 544 arranged on the outer surface of the arc-shaped abutting plate 543 are arranged to further improve the locking degree of the arc-shaped abutting plate 543 and the well wall, and further improve the stability and smoothness of the sampling member 53 during sampling.

[0058] The inside of each of the two first movable openings is fixedly connected with a limiting rod 545, and the inside of each of the two positioning strip blocks 542 is provided with a strip-shaped guide opening, and the two strip-shaped guide openings are movably sleeved on the outer surface of the two limiting rods 545.

[0059] The limiting rods 545 are arranged to move in the strip-shaped guide openings, so as to guide the positioning strip blocks 542, improve the convenience and smoothness of the fan-shaped movement of the inclined positioning strip blocks 542, and improve the stability of the positioning strip blocks 542 after the extension movement.

[0060] Referring to the accompanying Figure 3 , Figure 4 and Figures 7 to 9 The inside of the protective shell 5 is provided with a falling prevention assembly 6, and the falling prevention assembly 6 is connected with the bottom end of the rope 4 through a hanging member 7.

[0061] The anti-falling assembly 6 is used for locking the sampling mechanism in the air when the rope 4 is broken.

[0062] The anti-falling assembly 6 is connected with the rope 4 through the suspension piece 7, which not only facilitates the up-down movement of the protective shell 5 through the winding and unwinding of the rope 4 to form different positions of the soil sampling work, but also facilitates the extension movement of the anti-falling assembly 6 when the protective shell 5 falls after the rope 4 is broken, so that the protective shell 5 is locked with the inner wall of the well to form the anti-falling protection work.

[0063] Embodiment 2: Different from embodiment 1, the anti-falling assembly 6 is connected with the rope 4 through the suspension piece 7, which not only facilitates the up-down movement of the protective shell 5 through the winding and unwinding of the rope 4 to form different positions of the soil sampling work, but also facilitates the extension movement of the anti-falling assembly 6 when the protective shell 5 falls after the rope 4 is broken, so that the protective shell 5 is locked with the inner wall of the well to form the anti-falling protection work.

[0064] Referring to the accompanying drawings Figure 3 , Figure 4 and Figures 7 to 9 , the anti-falling assembly 6 includes a gravity block 61 arranged at the top of the protective shell 5, the outer edge of the bottom of the gravity block 61 is hinged with a plurality of inclined transmission frames 62, and the outer surface of the protective shell 5 is provided with a plurality of second movable openings for the bottom end of the transmission frame 62 to extend to the outside of the protective shell 5, the inside of each of the plurality of second movable openings is fixedly connected with a guide column 63, the bottom end of each of the plurality of transmission frames 62 extends to the outside of the protective shell 5 through the plurality of second movable openings, the inside of each of the plurality of transmission frames 62 is provided with an inclined strip-shaped movable opening, and the outside surface of each of the plurality of guide columns 63 is movably sleeved with each of the plurality of strip-shaped movable openings.

[0065] Through the downward movement of the gravity block 61, the plurality of inclined transmission frames 62 can be moved in a fan shape, and the fan-shaped movement of the plurality of transmission frames 62 can be extended through the plurality of second movable openings to abut against the inner wall of the well to form the anti-falling work of the sampling mechanism.

[0066] The guide column 63 is arranged to improve the guidance of the extension drive of the transmission frame 62 and further improve the contact effect with the inner wall of the well.

[0067] The bottom of the gravity block 61 is provided with a receiving groove, so that when the gravity block 61 moves downward to the limit position, the top of the electric cylinder 51 can be received in the inside of the gravity block 61.

[0068] The bottom end of each of the plurality of transmission frames 62 is hinged with an arc-shaped friction plate 64, and the outer side surface of each of the plurality of arc-shaped friction plates 64 is provided with a protective pattern.

[0069] The arc-shaped friction plate 64 is arranged to abut against the inner wall of the well, the protective pattern on the outer surface of the arc-shaped friction plate 64 improves the friction force of the abutment, thereby improving the locking force of the sampling mechanism and the inner wall of the well, and further improving the anti-falling performance.

[0070] The inner part of the protective shell 5 is provided with an annular frame 65, a plurality of blocking shafts 66 are slidingly connected in the inner part of the annular frame 65, the top ends of the plurality of blocking shafts 66 are provided with protruding parts, the bottom ends of the plurality of blocking shafts 66 are slidingly arranged in the bottom of the protective shell 5, and the annular frame 65 is fixedly connected with the gravity block 61 through a connecting frame;

[0071] The annular frame 65 is fixedly connected with the gravity block 61 through the connecting frame, so that when the gravity block 61 falls downward, the annular frame 65 can be driven to move downward synchronously, and the downward movement of the annular frame 65 can drive the plurality of blocking shafts 66 to move downward, thereby blocking the surrounding of the stretched sampling member 53, and solving the problem that the impact force of the loess collapse during the sampling process easily causes damage to the stretched sampling member 53, and further causes the connection position of the sampling member 53 and the sampling member 53 itself to be broken;

[0072] The plurality of blocking shafts 66 are connected with the annular frame 65 in a sliding manner, so that when the sampling member 53 is in the stretched sampling state, the blocking shafts 66 at this position will not move downward, thereby avoiding the downward movement of the blocking shafts 66 and causing damage to the sampling member 53.

[0073] Embodiment 3: Different from embodiment 1 is that

[0074] Referring to the accompanying drawings Figure 9 and Figure 10 The suspension member 7 comprises a connecting shaft 71 slidingly connected to the top of the protective shell 5, the bottom end of the connecting shaft 71 extends into the inner part of the protective shell 5 and is fixedly connected with the top of the gravity block 61, the top end of the connecting shaft 71 is connected with a hanging ring 72, and the rope 4 is connected with the hanging ring 72 through a hook;

[0075] The hanging ring 72 is fixedly connected with the gravity block 61 through the connecting shaft 71, so that when the rope 4 is suspendedly connected with the hanging ring 72 through the hook, the protective shell 5 can move downward through its own gravity, thereby making the gravity block 61 located above the protective shell 5, if the rope 4 is broken or the hook is unhooked, the gravity block 61 can move downward at a high speed through its own gravity, thereby driving the anti-falling assembly 6 to stretch, and the inner top of the protective shell 5 can be further provided with a spring group for pressing the gravity block 61 downward, so as to improve the speed of the downward movement of the gravity block 61, and the speed of the downward movement of the gravity block 61 is greater than the speed of the downward movement of the whole protective shell 5;

[0076] The top end of the connecting shaft 71 is fixedly connected with a hemispherical shell 73, the hemispherical shell 73 is rollingly provided with a hollow ball 74 in the inner part, the hanging ring 72 is fixedly connected with the hollow ball 74, and the inner bottom of the hollow ball 74 is provided with a gravity center block 75;

[0077] The hollow ball 74 rolls inside the hemispherical shell 73, facilitating the hanging ring 72 to tilt at different angles. The center of gravity block 75 is arranged at the bottom of the hollow ball 74, so that when the rope 4 breaks or the hook unhooking occurs, and the sampling mechanism tilts at different angles, the center of gravity block 75 can vertically downward, so that the hanging ring 72 is always in a vertical state, facilitating subsequent workers to hang the hook for hooking work, solving the problem that when the rope 4 breaks, the sampling mechanism tilts in the well, causing the hanging ring 72 to tilt, affecting subsequent hanging work, and making it difficult to take the sampling mechanism out of the well;

[0078] The connecting shaft 71 is internally provided with a latch hole 76, and the top of the protective shell 5 is slidably connected with a T-shaped latch block for inserting into the inside of the latch hole 76. The T-shaped latch block is not labeled in the figure, and can be specifically referred to the attached Figure 2 ;

[0079] The insertion of the T-shaped latch block into the latch hole 76 can lock the connecting shaft 71, preventing the anti-falling assembly 6 from expanding when the protective shell 5 is stored on the ground during sampling work. The T-shaped latch block can be removed during sampling work, improving the convenience of operation and subsequent management.

[0080] It should be noted that the term "comprising" or any other variant is intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0081] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A collapsible loess exploration well downhole soil taking device, comprising a sampling mechanism and a lifting mechanism for lifting driving the sampling mechanism, the lifting mechanism comprising a portal frame (1), one side of the portal frame (1) being provided with a control box (2), a winding machine (3) being fixedly installed at the top of the portal frame (1), and the winding end of the winding machine (3) being connected with the sampling mechanism through a rope (4), characterized in that: The sampling mechanism comprises a cylindrical protective shell (5), and an extension opening is formed in the bottom of the protective shell (5); The inside of the protective shell (5) is provided with a sampling member (53) with a pushing and rotating function, a positioning member (54) for positioning the sampling mechanism in the well, and an electric cylinder (51) for driving the sampling member (53) and the positioning member (54); The inner bottom of the protective shell (5) is fixedly connected with a U-shaped frame (52), and the electric cylinder (51) is fixed to the top of the U-shaped frame (52); The sampling member (53) comprises a connecting plate (531), the bottom of the connecting plate (531) is provided with an electric guide rail member (532) for transverse driving, the driving end of the electric guide rail member (532) is fixedly installed with a soil sampling shovel cylinder (534), the telescopic end of the electric cylinder (51) is fixedly connected with the top of the connecting plate (531), the sampling member (53) is driven to perform telescopic movement by the electric cylinder (51), and sampling or storage protection work is formed; The bottom of the connecting plate (531) is fixedly connected with a driving motor (533) for rotating adjustment of the electric guide rail member (532), and the output shaft of the driving motor (533) is fixedly connected with the electric guide rail member (532); The positioning member (54) comprises at least two guide blocks (541) slidably connected in the inside of the U-shaped frame (52), the bottom of each of the two guide blocks (541) is fixed to the top of the connecting plate (531), the top of each of the two guide blocks (541) is hingedly provided with an inclined positioning strip block (542), two first movable openings are formed in the outer surface of the protective shell (5), and the bottom end of each of the two positioning strip blocks (542) extends to the outside of the protective shell through the first movable opening; The bottom end of each of the two positioning strip blocks (542) is hingedly provided with an arc-shaped abutting plate (543), and the outer side surface of each of the two arc-shaped abutting plates (543) is fixedly connected with a plurality of positioning anchor rods (544); The inside of each of the two first movable openings is fixedly connected with a limiting rod (545), and the inside of each of the two positioning strip blocks (542) is provided with a strip-shaped guide opening, and the outer surface of each of the two limiting rods (545) is movably sleeved with a strip-shaped guide opening.

2. The downhole soil sampling device for collapsible loess exploration well according to claim 1, characterized in that: The inside of the protective shell (5) is provided with a falling prevention assembly (6), and the falling prevention assembly (6) is connected with the bottom end of the rope (4) through a hanging member (7); The falling prevention assembly (6) is used for locking the sampling mechanism in the air when the rope (4) is broken.

3. The downhole soil sampling device for collapsible loess exploratory drilling according to claim 2, characterized in that: The anti-falling assembly (6) comprises a gravity block (61) arranged at the top of the protective shell (5), the outer edge of the bottom of the gravity block (61) is hinged with a plurality of inclined transmission frames (62), and the outer surface of the protective shell (5) is provided with a plurality of second movable openings for the bottom end of the transmission frame (62) to extend to the outside of the protective shell (5), the inside of the plurality of second movable openings is fixedly connected with a guide column (63), the bottom end of the plurality of transmission frames (62) respectively extends to the outside of the protective shell (5) through the plurality of second movable openings, the inside of the plurality of transmission frames (62) is provided with an inclined strip-shaped movable opening, and the plurality of strip-shaped movable openings are movably sleeved on the outer surface of the plurality of guide columns (63). The bottom end of the plurality of transmission frames (62) is hinged with an arc-shaped friction plate (64), and the outer side of the plurality of arc-shaped friction plates (64) is provided with a protective pattern.

4. The downhole soil sampling device for collapsible loess exploratory drilling according to claim 3, characterized in that: The suspension component (7) comprises a connecting shaft (71) slidably connected to the top of the protective shell (5), the bottom end of the connecting shaft (71) extends to the inside of the protective shell (5) and is fixedly connected with the top of the gravity block (61), the top end of the connecting shaft (71) is connected with a hanging ring (72), and the rope (4) is connected with the hanging ring (72) through a hook.

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