Sampling device for mine geological exploration

By introducing a fixed cone, a limiting rod, and a placement and locking mechanism into the sampling device, the installation problem of the sampling device in complex terrain in the field was solved, and a fast and stable sampling operation was achieved.

CN121994525APending Publication Date: 2026-05-08JIANGXI YONGFENG JINFENG FLUORSPAR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGXI YONGFENG JINFENG FLUORSPAR CO LTD
Filing Date
2024-04-03
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing sampling devices are difficult to install in complex terrain in the field, requiring manual leveling of the ground to ensure that the support is installed vertically, which is complicated and inconvenient.

Method used

The sampling device consists of a bottom fixing cone, a limiting rod, a sampler, a placement mechanism, a locking mechanism, and a lifting mechanism. After being initially fixed by the fixing cone, it automatically adjusts and locks itself in the designated position, achieving stable installation in complex terrain.

Benefits of technology

Without requiring terrain preparation, the sampling device was installed quickly and stably, simplifying the operation process and improving the efficiency of field sampling.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a sampling device for mine geological exploration in the technical field of geological exploration. The sampling device comprises a mounting frame, and a plurality of fixing cones are fixedly connected to the bottom of the mounting frame; a plurality of limiting rods are fixedly connected to the mounting frame, and a sampling machine is arranged above the mounting frame and is in sliding connection with the limiting rods; a plurality of fixing mechanisms are arranged on the mounting frame and are used for fixing the fixing frame and the ground together; a plurality of placing mechanisms are arranged on the mounting frame and are used for putting the fixing mechanisms corresponding to the placing mechanisms to fixing positions under various complex terrains; a locking mechanism is arranged on the mounting rack, and is used for locking the mounting mechanism and the mounting rack after the mounting mechanism corresponding to the mounting mechanism is placed by the placing mechanism; the device can be directly installed in various uneven terrain environments in the field for sampling work, the terrain does not need to be leveled manually, operation is more convenient, and installation is convenient.
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Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, specifically to a sampling device for mine geological exploration. Background Technology

[0002] Geological exploration is a research activity that involves investigating and exploring geology using various means and methods to determine suitable bearing strata, identify foundation types based on the bearing capacity of the bearing strata, and calculate foundation parameters. It also involves investigating and researching the geological conditions of a specific area, including rocks, strata, structures, minerals, hydrology, and geomorphology, to ascertain the quality and quantity of minerals, as well as the technical conditions for their extraction and utilization, and to provide the necessary mineral reserves and geological data for mine construction and design.

[0003] Existing sampling devices typically require a support frame to hold the device in place, allowing it to be inserted vertically into the ground. To ensure accurate and complete sample collection, the support frame is usually installed in a designated location after precise measurements. However, due to the complex and uneven terrain in the field, the support frame installation requires manual leveling of the area before it can be installed vertically, making the process quite complicated. Summary of the Invention

[0004] The purpose of this invention is to provide a sampling device for mine geological exploration to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sampling device for mine geological exploration, comprising a mounting frame, wherein multiple fixing cones are fixedly connected to the bottom of the mounting frame; multiple limiting rods are fixedly connected to the mounting frame, and a sampler is provided above the mounting frame, the sampler being slidably connected to the limiting rods; multiple fixing mechanisms are provided on the mounting frame, the fixing mechanisms being used to fix the mounting frame to the ground; multiple placement mechanisms are provided on the mounting frame, the placement mechanisms being used to place the corresponding fixing mechanisms to fixed positions under various complex terrain conditions; and a locking mechanism is provided on the mounting frame, the locking mechanism being used to lock the corresponding fixing mechanism to the mounting frame after the placement mechanism has placed it.

[0006] The delivery mechanism includes three first connecting blocks, which are arranged in a circular array on the mounting frame and are all fixedly connected to the mounting frame. A first connecting rod and a second connecting rod are rotatably connected to the first connecting blocks, and a second connecting block is provided at the other end of the first connecting rod. The second connecting block is rotatably connected to the first connecting rod and the second connecting rod.

[0007] The mounting mechanism includes three connecting plates arranged in a circular array around the mounting frame. A motor is fixedly connected to each connecting plate, and the motor has two output shafts, each with a first bevel gear fixedly connected to it. Screws are symmetrically rotatably connected to both sides of the connecting plates, and a second bevel gear is fixedly connected to the upper end of each screw. The two first bevel gears mesh with the two second bevel gears respectively. Two screws are symmetrically distributed on both sides of a second connecting block, and both screws are threadedly connected to the second connecting block.

[0008] The screws are perpendicular to each other relative to the mounting bracket; the first connecting rod and the second connecting rod are parallel to each other and of equal length.

[0009] The locking mechanism includes six support frames, which are arranged in pairs on the mounting frame. Three sets of support frames correspond to three first connecting blocks, and all three sets are fixedly connected to the mounting frame. A first gear and a second gear are symmetrically rotatably connected to both sides of one set of support frames. A first arc-shaped rack and a second arc-shaped rack are symmetrically rotatably connected to both sides of the first connecting block, with the first gear and the second gear meshing with the first arc-shaped rack and the second arc-shaped rack, respectively. The portion of the first connecting rod connected to the first connecting block is fixedly connected to two first arc-shaped racks. The portion of the second connecting rod connected to the first connecting block is fixedly connected to two second arc-shaped racks. A driving mechanism is located above one set of support frames, which drives the two first gears and the two second gears to rotate.

[0010] The driving mechanism includes a connecting frame, on which two racks are symmetrically fixedly connected on both sides of the bottom of the connecting frame. Each rack is meshed with a third gear, and the two third gears are coaxially fixedly connected to the first gear and the second gear, respectively. The mounting frame is provided with a lifting mechanism, which is used to drive the connecting frame to move up and down.

[0011] The lifting mechanism includes a lifting ring located between the mounting frame and three connecting frames. The three connecting frames are all in contact with the upper surface of the lifting ring. Three cylinders are evenly fixedly connected to the mounting frame, and the three cylinders are arranged in a circumferential array on the mounting frame, with the other end of each cylinder fixedly connected to the lifting ring. The lifting ring is provided with a self-locking mechanism, which is used to lock the connecting frames so that they cannot move when the lifting ring descends to the bottom position.

[0012] The self-locking mechanism includes six threaded rods, all of which are rotatably connected to the lifting ring. The six threaded rods are arranged in a circumferential array on the lifting ring in pairs. Two threaded rods are located on both sides of the connecting frame and are threadedly connected to the connecting frame. A first friction block is fixedly connected to the bottom end of each threaded rod, and a second friction block is provided on the bottom side of the first friction block. The second friction block is fixedly connected to the mounting frame. The threaded rods do not have self-locking properties.

[0013] The first friction block is shaped like a frustum with a bottom diameter smaller than the top diameter, and the upper part of the second friction block is an inverted frustum that is concave inward and fits perfectly with the first friction block.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention first places the mounting frame at the designated sampling location, then presses the mounting frame so that the fixing cone at the bottom of the mounting frame inserts into the ground, completing the initial fixing of the mounting frame. At this time, all the placement mechanisms are activated, and the placement mechanisms automatically lower their corresponding mounting mechanisms to the installation position. At this time, even if the surrounding terrain is complex and uneven, the mounting mechanism can remain in the installed state even if the terrain does not need to be leveled. After the mounting mechanism is placed, all the locking mechanisms and installation mechanisms are activated in sequence. The locking mechanism locks the corresponding mounting mechanism to the mounting frame, so that the mounting frame and the mounting mechanism are relatively stationary. Then the installation mechanism directly installs the mounting frame to the ground, completing the installation of the mounting frame. At this time, the sampler can be put on the limiting rod, and then the sampler is started to start sampling. This device can be directly installed in various uneven terrain environments in the field and then used for sampling, without the need for manual leveling of the terrain, making it more convenient to operate, easy to install, and with strong stability after installation.

[0016] 2. This invention uses a cylinder to raise and lower a lifting ring, which in turn raises and lowers all the connecting frames. When the lifting ring moves downward, the connecting frames can fall freely, allowing the corresponding first link, second link, or second connecting block to stop upon contact with the ground, at which point the installation mechanism can be activated for installation. When retraction is required, simply activate the cylinder to raise the lifting ring, which lifts all the connecting frames, causing the corresponding first and second links to rotate upward and retract. The installation frame can be unfolded and retracted by lowering and raising the lifting frame, further improving the ease of installation. Furthermore, the overall footprint is reduced after the installation frame is retracted, facilitating transportation. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the disassembled structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the self-locking mechanism in this invention;

[0020] Figure 4 This is a schematic diagram of the locking mechanism in this invention;

[0021] Figure 5 This is a schematic diagram of the locking mechanism from a second perspective in this invention;

[0022] Figure 6 This is a schematic diagram of the disassembled structure of the locking mechanism in this invention;

[0023] Figure 7 This is a schematic diagram of the unfolded structure of the present invention.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Mounting bracket; 2. Fixed cone; 3. Limiting rod; 4. Sampler; 5. First connecting block; 6. First connecting rod; 7. Second connecting rod; 8. Second connecting block; 9. Connecting plate; 10. Motor; 11. First bevel gear; 12. Screw; 13. Second bevel gear; 14. Support frame; 15. First gear; 16. Second gear; 17. First arc-shaped rack; 18. Second arc-shaped rack; 19. Connecting frame; 20. Rack; 21. Third gear; 22. Lifting ring; 23. Cylinder; 24. Threaded rod; 25. First friction block; 26. Second friction block. Detailed Implementation

[0026] Please see Figures 1-7 This invention provides a technical solution: a sampling device for mine geological exploration, comprising a mounting frame 1, with multiple fixed cones 2 fixedly connected to the bottom of the mounting frame 1; multiple limiting rods 3 fixedly connected to the mounting frame 1, and a sampler 4 positioned above the mounting frame 1, the sampler 4 being slidably connected to the limiting rods 3; multiple fixing mechanisms on the mounting frame 1 for fixing the mounting frame to the ground; multiple placement mechanisms on the mounting frame 1 for placing the corresponding fixing mechanism to a fixed position under various complex terrain conditions; and a locking mechanism on the mounting frame 1 for locking the corresponding fixing mechanism to the mounting frame 1 after the placement mechanism has placed the corresponding fixing mechanism.

[0027] like Figure 1 , Figure 7As shown, during operation, when sampling is required, the mounting frame 1 is first placed at the designated sampling position, and then the mounting frame 1 is pressed down so that the fixing cone 2 at the bottom of the mounting frame 1 is inserted into the ground, completing the initial fixing of the mounting frame 1. At this time, all the placement mechanisms are activated, and the placement mechanisms automatically lower the corresponding mounting mechanisms and place them in the installation position. At this time, when the surrounding terrain is complex and uneven, the mounting mechanisms can be lowered in the installation state without leveling the terrain. After the mounting mechanism is placed down, all the locking mechanisms and installation mechanisms are activated in sequence. The locking mechanism locks the corresponding mounting mechanism to the mounting frame 1, so that the mounting frame 1 and the mounting mechanism are relatively stationary. Then the installation mechanism will directly install the mounting frame 1 to the ground, completing the installation of the mounting frame 1. At this time, the sampler can be put on the limiting rod 3, and then the sampler 4 is started to start sampling. This device can be directly installed in various uneven terrain environments in the field and then sampling can be carried out without the need for manual leveling of the terrain. It is more convenient to operate, easy to install, and has strong stability after installation.

[0028] like Figures 1-2 As a further embodiment of the present invention, the delivery mechanism includes three first connecting blocks 5, which are arranged in a circular array on the mounting frame 1 and are all fixedly connected to the mounting frame 1; a first connecting rod 6 and a second connecting rod 7 are rotatably connected to the first connecting block 5, and a second connecting block 8 is provided at the other end of the first connecting rod 6, which is rotatably connected to the first connecting rod 6 and the second connecting rod 7.

[0029] During operation, when mounting bracket 1 needs to be installed, the three first connecting rods 6 and second connecting rods 7 on mounting bracket 1 can be driven to rotate freely downwards. When the first connecting rods 6 and second connecting rods 7 rotate freely downwards, they will drive the second connecting block 8 to move downwards in tandem with the first connecting rods 6 and second connecting rods 7. When the first connecting rod 6, the second connecting rod 7, or the second connecting block 8 touches the ground, the first connecting rod 6 and the second connecting rod 7 will stop rotating downwards, and the second connecting block 8 connected to them will also stop.

[0030] like Figure 4 , Figure 7As shown, as a further embodiment of the present invention, the mounting mechanism includes three connecting plates 9, which are arranged in a circumferential array around the mounting frame 1; a motor 10 is fixedly connected to the connecting plates 9, the motor 10 has two output shafts, and a first bevel gear 11 is fixedly connected to each of the two output shafts of the motor 10; screws 12 are symmetrically rotatably connected to both sides of the connecting plates 9, and a second bevel gear 13 is fixedly connected to the upper end of the screws 12, with the two first bevel gears 11 meshing with the two second bevel gears 13 respectively; two screws 12 are symmetrically distributed on both sides of the second connecting block 8, and both screws 12 are threadedly connected to the second connecting block 8;

[0031] The screw 12 is perpendicular to the mounting bracket 1; the first connecting rod 6 and the second connecting rod 7 are parallel to each other and of equal length.

[0032] During operation, when the first connecting rod 6 and the second connecting rod 7 drive the second connecting block 8 connected to them to move downwards, the second connecting block 8 will drive the two screws 12 connected to it to move downwards. Since the screws 12 are perpendicular to the mounting bracket 1, and the first connecting rod 6 and the second connecting rod 7 are parallel to each other and of equal length, the screws 12 always remain perpendicular to the mounting bracket 1 during the process of the first connecting rod 6 and the second connecting rod 7 driving the second connecting block 8 to move downwards. When the first connecting rod 6, the second connecting rod 7, or the second connecting block 8 touches the ground, the motor 10 is started. The motor 10 drives the first bevel gear 11 at both ends to rotate, the first bevel gear 11 drives the second bevel gear 13 to rotate, and the second bevel gear 13 drives the screws 12 to rotate. When the screws 12 rotate, they will slowly move downwards and insert into the ground.

[0033] like Figures 4-6 As shown, as a further embodiment of the present invention, the locking mechanism includes six support frames 14, which are distributed on the mounting frame 1 in groups of two; three groups of support frames 14 correspond to three first connecting blocks 5 respectively, and all three groups of support frames 14 are fixedly connected to the mounting frame 1; a first gear 15 and a second gear 16 are symmetrically rotatably connected to both sides of one group of support frames 14; a first arc-shaped rack 17 and a second arc-shaped rack 18 are symmetrically rotatably connected to both sides of the first connecting block 5, and the first gear 15 and the second gear 16 mesh with the first arc-shaped rack 17 and the second arc-shaped rack 18 respectively; the portion of the first connecting rod 6 that connects to the first connecting block 5 is fixedly connected to the two first arc-shaped racks 17; the portion of the second connecting rod 7 that connects to the first connecting block 5 is fixedly connected to the two second arc-shaped racks 18; a driving mechanism is provided above one group of support frames 14, which is used to drive the two first gears 15 and the two second gears 16 to rotate;

[0034] The drive mechanism includes a connecting frame 19, on which two racks 20 are symmetrically fixedly connected on both sides of the bottom of the connecting frame 19. Each rack 20 is meshed with a third gear 21, and the two third gears 21 are coaxially fixedly connected to the first gear 15 and the second gear 16 respectively. The mounting frame 1 is provided with a lifting mechanism, which is used to drive the connecting frame 19 to move up and down.

[0035] During operation, when the second connecting frame 19 needs to be lowered, the lifting mechanism drives the connecting frame 19 to move downward. The connecting frame 19 then drives the four racks 20 connected to it to move downward. When the racks 20 move downward, they drive the third gear 21 meshing with them to rotate. When the third gear 21 rotates, it drives the first gear 15 and the second gear 16 connected to it to rotate. The first gear 15 drives the first arc-shaped rack 17 to rotate, and the first arc-shaped rack 17 drives the first connecting rod 6 to rotate downward. When the second gear 16 rotates, it drives the second arc-shaped rack 18 to rotate, and the second arc-shaped rack 18 drives the second connecting rod 7 to rotate downward.

[0036] like Figures 2-3 As shown, as a further embodiment of the present invention, the lifting mechanism includes a lifting ring 22, which is located between the mounting frame 1 and three connecting frames 19; the three connecting frames 19 are all in contact with the upper surface of the lifting ring 22; three cylinders 23 are uniformly fixedly connected to the mounting frame 1, and the three cylinders 23 are distributed in a circumferential array on the mounting frame 1, with the other end of each of the three cylinders 23 being fixedly connected to the lifting ring 22; the lifting ring 22 is provided with a self-locking mechanism, which is used to lock the connecting frames 19 so that they cannot move when the lifting ring 22 descends to the bottom position;

[0037] During operation, when it is necessary to drive the connecting frame 19 to move downward, simply drive all the cylinders 23 to move the lifting ring 22 downward. Since the upper surface of the lifting ring 22 is in contact with the connecting frame 19, the connecting frame 19 will also move downward under its own weight when the lifting ring 22 moves downward. Therefore, the corresponding first link 6 and second link 7 will rotate downward. When the first link 6 and second link 7 or the second connecting block 8 connected to the first link 6 and second link 7 contact the ground, the first link 6 and second link 7 will stop rotating downward, and the corresponding connecting frame 19 will stop moving downward. When the lifting ring 22 moves to the bottom position, it can be ensured that each first link 6, second link 7 and second connecting block 8 can contact the ground. At this time, the self-locking mechanism can be activated to lock all the connecting frames 19 and prevent them from moving up or down.

[0038] like Figure 3As shown, as a further embodiment of the present invention, the self-locking mechanism includes six threaded rods 24, all of which are rotatably connected to the lifting ring 22 and are arranged in a circumferential array in pairs on the lifting ring 22. Two threaded rods 24 are distributed on both sides of the connecting frame 19 and are threadedly connected to the connecting frame 19. A first friction block 25 is fixedly connected to the bottom end of the threaded rod 24, and a second friction block 26 is provided on the bottom side of the first friction block 25. The second friction block 26 is fixedly connected to the mounting frame 1. The threaded rods 24 do not have self-locking properties.

[0039] The first friction block 25 is in the shape of a frustum and the bottom diameter is smaller than the top diameter. The upper part of the second friction block 26 is an inverted frustum that is concave inward and fits perfectly with the first friction block 25.

[0040] During operation, when the lifting ring 22 moves downward, the connecting frame 19 moves downward along with it. When the first connecting rod 6, the second connecting rod 7, and the second connecting block 8 corresponding to the connecting frame 19 contact the ground, the connecting frame 19 stops moving downward. When the lifting ring 22 continues to move downward, it will drive all the threaded rods 24 to move downward, and the connecting frame 19 will drive the two threaded rods 24 threaded to it to rotate. When the lifting ring 22 moves to the bottom position, the first friction block 25 at the bottom of the threaded rod 24 moves into the second friction block 26 and fits tightly against it. Under the action of the first friction block 25 and the second friction block 26, the threaded rod 24 cannot rotate, so the connecting block threaded to the threaded rod 24 cannot move up and down, and the first connecting rod 6 and the second connecting rod 7 corresponding to the connecting block cannot rotate up and down.

Claims

1. A sampling device for geological exploration in mines, comprising a mounting frame (1), characterized in that: The mounting frame (1) has multiple fixed cones (2) fixedly connected to its bottom; multiple limiting rods (3) are fixedly connected to the mounting frame (1) and a sampling machine (4) is provided above the mounting frame (1), the sampling machine (4) and the limiting rods (3) are slidably connected; multiple fixing mechanisms are provided on the mounting frame (1), the fixing mechanisms are used to fix the mounting frame to the ground; multiple placement mechanisms are provided on the mounting frame (1), the placement mechanisms are used to place the corresponding fixing mechanisms to fixed positions under various complex terrains; a locking mechanism is provided on the mounting frame (1), the locking mechanism is used to lock the mounting mechanism to the mounting frame (1) after the placement mechanism has placed the corresponding mounting mechanism.

2. The sampling device for mine geological exploration according to claim 1, characterized in that: The delivery mechanism includes three first connecting blocks (5), which are arranged in a circular array on the mounting frame (1) and are fixedly connected to the mounting frame (1). A first connecting rod (6) and a second connecting rod (7) are rotatably connected to the first connecting block (5). A second connecting block (8) is provided at the other end of the first connecting rod (6), and the second connecting block (8) is rotatably connected to the first connecting rod (6) and the second connecting rod (7).

3. The sampling device for mine geological exploration according to claim 2, characterized in that: The mounting mechanism includes three connecting plates (9), which are arranged in a circular array around the mounting frame (1). A motor (10) is fixedly connected to the connecting plate (9). The motor (10) has two output shafts, and a first bevel gear (11) is fixedly connected to each of the two output shafts. Screws (12) are symmetrically rotatably connected to both sides of the connecting plate (9). A second bevel gear (13) is fixedly connected to the upper end of the screw (12). The two first bevel gears (11) mesh with the two second bevel gears (13) respectively. The two screws (12) are symmetrically distributed on both sides of the second connecting block (8), and both screws (12) are threadedly connected to the second connecting block (8).

4. The sampling device for mine geological exploration according to claim 3, characterized in that: The screw (12) is perpendicular to the mounting bracket (1); the first connecting rod (6) and the second connecting rod (7) are parallel to each other and have the same length.

5. A sampling device for mine geological exploration according to claim 2, characterized in that: The locking mechanism includes six support frames (14), which are distributed on the mounting frame (1) in pairs; three sets of support frames (14) correspond to three first connecting blocks (5) respectively, and all three sets of support frames (14) are fixedly connected to the mounting frame (1); a first gear (15) and a second gear (16) are symmetrically rotatably connected to both sides of one set of support frames (14); a first arc-shaped rack (17) and a second arc-shaped rack (18) are symmetrically rotatably connected to both sides of the first connecting block (5). Gear (15) and second gear (16) mesh with first arc rack (17) and second arc rack (18) respectively; the portion of the first connecting rod (6) connected to the first connecting block (5) is fixedly connected to the two first arc racks (17); the portion of the second connecting rod (7) connected to the first connecting block (5) is fixedly connected to the two second arc racks (18); a driving mechanism is provided above a set of support frames (14), the driving mechanism being used to drive the two first gears (15) and the two second gears (16) to rotate.

6. The sampling device for mine geological exploration according to claim 5, characterized in that: The driving mechanism includes a connecting frame (19), on which two racks (20) are symmetrically fixedly connected on both sides of the bottom of the connecting frame (19). Each of the two racks (20) is meshed with a third gear (21), and the two third gears (21) are coaxially fixedly connected to the first gear (15) and the second gear (16), respectively. The mounting frame (1) is provided with a lifting mechanism, which is used to drive the connecting frame (19) to move up and down.

7. A sampling device for mine geological exploration according to claim 6, characterized in that: The lifting mechanism includes a lifting ring (22), which is located between the mounting frame (1) and three connecting frames (19); the three connecting frames (19) are all in contact with the upper surface of the lifting ring (22); three cylinders (23) are evenly fixedly connected to the mounting frame (1), and the three cylinders (23) are arranged in a circumferential array on the mounting frame (1), and the other end of each of the three cylinders (23) is fixedly connected to the lifting ring (22); the lifting ring (22) is provided with a self-locking mechanism, which is used to lock the connecting frames (19) so that they cannot move when the lifting ring (22) descends to the bottom position.

8. The sampling device for mine geological exploration according to claim 7, characterized in that: The self-locking mechanism includes six threaded rods (24), all six threaded rods (24) are rotatably connected to the lifting ring (22), and the six threaded rods (24) are arranged in a circumferential array in pairs on the lifting ring (22). Two threaded rods (24) are distributed on both sides of the connecting frame (19), and both threaded rods (24) are threadedly connected to the connecting frame (19). A first friction block (25) is fixedly connected to the bottom end of the threaded rod (24), and a second friction block (26) is provided on the bottom side of the first friction block (25). The second friction block (26) is fixedly connected to the mounting frame (1). The threaded rod (24) does not have self-locking properties.

9. A sampling device for mine geological exploration according to claim 8, characterized in that: The first friction block (25) is in the shape of a frustum and the bottom diameter is smaller than the top diameter. The upper part of the second friction block (26) is an inverted frustum that is concave inward and fits perfectly with the first friction block (25).