Fixing device for sampling in hydrogeological exploration

Abstract

This invention relates to the field of hydrogeological exploration technology and discloses a fixing device for sampling in hydrogeological exploration, including a support frame. In this fixing device, a hydraulic cylinder one drives an annular block and connecting plate downwards via its output end. Simultaneously, a motor drives a drill rod to rotate and drill into the formation via its output end, thus initially fixing the drill rod. Then, a hydraulic cylinder two drives a limiting claw to extend out of a rectangular hole. By energizing an electromagnet, the electromagnet and a magnetic component magnetically couple, "nailing" the limiting claw to the borehole wall, forming a mechanical clamping force that further enhances the fixing force, creating a dual fixing mode of "magnetic adsorption + mechanical clamping." Because of the moisture in the soil, the expansion element on the limiting claw expands upon contact with water. During expansion, it drives a conical needle to move obliquely upwards, causing the needle to pierce into the pores of the formation, using mechanical wedging to fix the device. This improves the anchoring force in loose soil layers or fractured rock layers.

Description

Technical Field

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

[0002] In the field of hydrogeological exploration, the stability and reliability of the fixed device during the sampling process directly affect the accuracy of the sample and the exploration efficiency.

[0003] Traditional sampling fixation devices for hydrogeological exploration typically have the following problems: for loose soil layers, wet or fractured strata, traditional fixation devices are difficult to provide sufficient fixing force. The high permeability or mechanical heterogeneity of the strata can easily lead to device displacement, tilting, or even borehole collapse during drilling, resulting in sampling failure or sample contamination. Therefore, we propose a fixation device for sampling in hydrogeological exploration to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fixed device for sampling in hydrogeological exploration, which solves the problems mentioned in the background art.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a fixed device for sampling in hydrogeological exploration, including a support frame, a sampling structure and a fixing structure. The fixing structure includes a support cylinder, an annular block is slidably connected to the outer wall of the support cylinder, T-shaped blocks are symmetrically fixedly installed on the inner wall of the annular block, a plurality of annularly arranged connecting plates are fixedly connected to the outer wall of the annular block, a drive motor is fixedly installed on the plurality of connecting plates, a drill rod is fixedly connected to the output end of the drive motor, a cavity is opened in the drill rod, a plurality of annularly arranged rectangular holes are opened on the outer wall of the drill rod, magnetic components are symmetrically fixedly installed on the inner walls of the plurality of rectangular holes, and a limit component is provided in the cavity.

[0006] The limiting component includes a second hydraulic cylinder, which is fixedly installed on the inner wall of the cavity. Two connecting blocks are fixedly connected to the outer wall of the output end of the second hydraulic cylinder. Limiting claws are hinged to the outer walls of the two connecting blocks. Electromagnets are fixedly installed on the outer walls of both sides of the limiting claws.

[0007] The upper surface of the limiting claw is provided with a groove, and an expansion member and a conical needle are provided in the groove. The limiting claw is provided with a telescopic spring. The outer wall of the output end of the second hydraulic cylinder is provided with several annularly arranged fixing grooves below the connecting block. A sealing ring is fixedly installed on the outer wall of the output end of the second hydraulic cylinder below the connecting block.

[0008] Furthermore, the fixing structure also includes a guide block and a conical sandbag. The outer wall of the guide block is fixedly installed on the inner wall of the support cylinder, and the inner wall of the conical sandbag is fixedly installed on the bottom outer wall of the support cylinder. The support cylinder and the outer wall of the conical sandbag are provided with arc-shaped holes. The outer wall of the conical sandbag is fixedly connected to a discharge pipe. The outer wall of the support cylinder is symmetrically provided with T-shaped grooves.

[0009] Furthermore, the guide block is frustum-shaped and located on one side of the arc-shaped hole, and the support cylinder is connected to the conical sandbag.

[0010] Furthermore, the expansion member is fixedly installed in the groove on the upper surface of the limiting claw, and the conical needle is fixedly installed on the outer wall of the expansion member.

[0011] Furthermore, the two ends of the telescopic spring are fixedly installed on the lower surface of the limiting claw and in the fixing groove.

[0012] Furthermore, the outer wall of the sealing ring is fitted to the inner wall of the cavity, and the sealing ring is made of fluororubber.

[0013] Furthermore, the rectangular hole is connected to the cavity, and the size of the rectangular hole is adapted to the size of the limiting claw.

[0014] Furthermore, the annular block is slidably connected to the outer wall of the support cylinder via a T-shaped block, the cross-sectional dimension of the T-shaped groove is 1.1 times the cross-sectional dimension of the T-shaped block, and the roughness Ra of the inner wall of the T-shaped groove is ≤1.6μm.

[0015] Furthermore, the hardness of the tapered needle tip on the expansion member is ≥HRC55, and the elastic coefficient of the telescopic spring is 5-10N / mm.

[0016] Furthermore, the magnetic component is a permanent magnet or an electromagnet.

[0017] Furthermore, a hydraulic cylinder is fixedly installed on the lower surface of the support frame, and the output end of the hydraulic cylinder is fixedly connected to the annular block.

[0018] The beneficial effects of this invention are:

[0019] 1. This fixing device for sampling in hydrogeological exploration consists of a hydraulic cylinder 1 that drives an annular block and connecting plate downwards via its output end. Simultaneously, a drive motor drives the drill rod to rotate and drill into the formation via its output end, initially fixing the drill rod. A second hydraulic cylinder in the limiting assembly drives a limiting claw to extend from a rectangular hole. By energizing an electromagnet, the electromagnet and magnetic component magnetically couple, further "nailing" the limiting claw to the borehole wall, creating a mechanical clamping force that further enhances the fixing force, forming a dual fixing mode of "magnetic adsorption + mechanical clamping." Because the soil contains moisture, an expansion component is installed on the limiting claw. This expansion component expands upon contact with water, causing a conical needle to move obliquely upwards and penetrate the formation pores. The mechanical wedging action significantly improves the anchoring force in loose soil or fractured rock layers.

[0020] 2. This fixed device for sampling in hydrogeological exploration features a conical sandbag into which soil, water, or sand can be poured through a support cylinder and an arc-shaped hole. After storing soil, the sandbag's weight increases (accumulating from several kilograms to tens of kilograms), enhancing the vertical pressure between the support cylinder and the ground through gravity, thus improving the overall stability of the device. Especially in loose strata (such as sand and silty clay), the weight of the sandbag can offset some of the horizontal thrust, reducing the risk of the support cylinder tilting. The flexible material of the conical sandbag (such as canvas or rubber) can be adjusted... The unevenness of the ground fills the gap between the support cylinder and the stratum, forming a passive wedging effect, which is especially suitable for uneven field operation surfaces; the gravity fixation of the conical sandbag is a static foundation support, while the "magnetic adsorption + mechanical clamping + expansion anchoring" of the limiting component is a dynamic deep fixation. The two form a three-dimensional fixation system that works together from top to bottom: the bottom of the support cylinder is stabilized by the gravity of the sandbag; the middle of the drill rod is embedded in the middle of the stratum by the limiting claw to resist horizontal displacement; the magnetic components and electromagnets provide radial adsorption force to reduce shaking. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the structure of the present invention;

[0024] Figure 3 This is a partial sectional view of the fixed structure of the present invention;

[0025] Figure 4 This is a partial sectional view of the drill pipe structure of the present invention;

[0026] Figure 5 For the present invention Figure 4Enlarged schematic diagram of the structure at point A in the middle;

[0027] Figure 6 This is a partial cross-sectional view of the limiting component of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Sampling structure; 3. Fixing structure; 31. Support cylinder; 32. Guide block; 33. Conical sandbag; 34. Arc-shaped hole; 35. Discharge pipe; 36. T-shaped chute; 371. Annular block; 372. T-shaped block; 373. Connecting plate; 374. Drive motor; 375. Drill rod; 376. Cavity; 377. Rectangular hole; 378. Magnetic component; 379. Limiting component; 3791. Hydraulic cylinder two; 3792. Connecting block; 3793. Limiting claw; 3794. Electromagnet; 3795. Groove; 3796. Expansion component; 3797. Conical needle; 3798. Telescopic spring; 3799. Fixing groove; 37910. Sealing ring; 38. Hydraulic cylinder one. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] Please see Figures 1-6 A fixed device for sampling in hydrogeological exploration includes a support frame 1, a sampling structure 2, and a fixing structure 3. The fixing structure 3 includes a support cylinder 31. An annular block 371 is slidably connected to the outer wall of the support cylinder 31. T-shaped blocks 372 are symmetrically fixedly installed on the inner wall of the annular block 371. Several annularly arranged connecting plates 373 are fixedly connected to the outer wall of the annular block 371. A drive motor 374 is fixedly installed on the several connecting plates 373. A drill rod 375 is fixedly connected to the output end of the drive motor 374. A cavity 376 is opened inside the drill rod 375. Several annularly arranged rectangular holes 377 are opened on the outer wall of the drill rod 375. Magnetic components 378 are symmetrically fixedly installed on the inner walls of the several rectangular holes 377. A limit component 379 is provided in the cavity 376.

[0031] The limiting component 379 includes a second hydraulic cylinder 3791, which is fixedly installed on the inner wall of the cavity 376. Two connecting blocks 3792 are fixedly connected to the outer wall of the output end of the second hydraulic cylinder 3791. Limiting claws 3793 are hinged to the outer walls of the two connecting blocks 3792. Electromagnets 3794 are fixedly installed on the outer walls of both sides of the limiting claws 3793.

[0032] The upper surface of the limiting claw 3793 is provided with a groove 3795, and an expansion member 3796 and a conical needle 3797 are provided in the groove 3795. The limiting claw 3793 is provided with a telescopic spring 3798. The outer wall of the output end of the hydraulic cylinder 3791 is located below the connecting block 3792 and has several annularly arranged fixing grooves 3799. A sealing ring 37910 is fixedly installed on the outer wall of the output end of the hydraulic cylinder 3791 located below the connecting block 3792.

[0033] In this embodiment, by activating hydraulic cylinder 38, the hydraulic cylinder 38 drives the annular block 371, T-block 372, and connecting plate 373 to move downward along the T-slot 36 via its output end. Simultaneously, the drive motor 374 is activated, driving the drill rod 375 to move into the formation and drill a hole via its output end. The drill rod 375 stops when it reaches a suitable position, thus initially fixing its position. Hydraulic cylinder 3791 in the limiting assembly 379 drives the limiting claw 3793 to extend out of the rectangular hole 377. By energizing the electromagnet 3794, the electromagnet 3794 interacts with the magnetic field. The magnetic coupling of component 378 (such as opposite poles attracting each other) further "nails" the limiting claw 3793 to the borehole wall, forming a mechanical clamping force (single claw clamping force ≥1000N), which further enhances the fixing force, forming a dual fixing mode of "magnetic adsorption + mechanical clamping". Since there is moisture in the soil, an expansion component 3796 is installed on the limiting claw 3793. The expansion component 3796 will expand when it comes into contact with water. When it expands, it drives the conical needle 3797 to move obliquely upward, so that the conical needle 3797 pierces into the pore of the formation. The fixing device is fixed by mechanical wedging action, which significantly improves the anchoring force in loose soil or fractured rock layers.

[0034] Reference Figures 1-3 As shown, the fixing structure 3 also includes a guide block 32 and a conical sandbag 33. The outer wall of the guide block 32 is fixedly installed on the inner wall of the support cylinder 31, and the inner wall of the conical sandbag 33 is fixedly installed on the outer wall of the bottom end of the support cylinder 31. The outer walls of the support cylinder 31 and the conical sandbag 33 are provided with arc-shaped holes 34. The outer wall of the conical sandbag 33 is fixedly connected to a discharge pipe 35. The discharge pipe 35 on the outer wall of the conical sandbag 33 can be connected to a negative pressure pump or a hose to periodically discharge the stored slag (Figure 3), so as to avoid the sandbag being too heavy and making it difficult to lift the device, while maintaining the controllability of the gravity fixing effect. The outer wall of the support cylinder 31 is symmetrically provided with T-shaped grooves 36.

[0035] In this embodiment, the conical sandbag 33 at the bottom of the support cylinder 31 is connected to the interior through the arc-shaped hole 34. Impurities such as rock cuttings and soil particles generated during drilling can be poured into the interior of the support cylinder 31 and guided to the arc-shaped hole 34 by the guide block 32 (conical structure) and stored in the conical sandbag 33. This allows the conical sandbag 33 to generate gravity, which fixes the support cylinder 31. After storing slag, the weight of the conical sandbag 33 increases (it can accumulate several kilograms to tens of kilograms). Through the action of gravity, it enhances the vertical pressure between the support cylinder 31 and the ground, thereby improving the overall stability of the device. Especially in loose strata (such as sand and silty clay), the weight of the sandbag can offset part of the horizontal thrust and reduce the risk of tilting of the support cylinder 31. The flexible material (such as canvas or rubber) of the conical sandbag 33 can deform with the unevenness of the ground, filling the gap between the support cylinder 31 and the stratum, forming a passive wedging effect, which is especially suitable for uneven field operation surfaces.

[0036] Reference Figure 2 , Figure 3 As shown, the guide block 32 is frustoconical and is located on one side of the arc-shaped hole 34. The support cylinder 31 is connected to the conical sandbag 33.

[0037] In this embodiment, the conical sandbag 33 provides a static stability foundation for the support cylinder 31 by the gravity generated by storing the slag and the friction between its conical structure and the ground. It is especially suitable for exploration scenarios that require long-term fixation or loose strata. This design complements the dynamic fixation of the limiting component 379, and together they ensure the overall rigidity and anti-interference ability of the device during the sampling process.

[0038] Reference Figure 5 , Figure 6 As shown, the expansion member 3796 is fixedly installed in the groove 3795 on the upper surface of the limiting claw 3793, and the conical needle 3797 is fixedly installed on the outer wall of the expansion member 3796.

[0039] In this embodiment, the expansion member 3796 is preferably made of a high-molecular water-absorbing and expanding material (such as acrylate rubber). After contacting the formation moisture, it expands in volume by 2-3 times, pushing the conical needle 3797 to pierce the pore obliquely upward. The tip of the conical needle 3797 has a hardness ≥ HRC55 (close to hard alloy), which can penetrate loose sand or fractured rock surface to form a mechanical wedge point.

[0040] Reference Figure 6 As shown, the two ends of the telescopic spring 3798 are fixedly installed on the lower surface of the limiting claw 3793 and in the fixing groove 3799.

[0041] In this embodiment, the telescopic spring 3798, with an elastic coefficient of 5-10 N / mm, is connected at one end to the lower surface of the limiting claw 3793, and at the other end is embedded in the fixing groove 3799. When the expansion member 3796 expands and generates an upward thrust, the spring is compressed and deformed to absorb stress, preventing the limiting claw 3793 from excessively squeezing the stratum and causing structural damage. At the same time, when the stratum experiences slight subsidence, the spring rebound can compensate for the displacement and maintain the stability of the fixing force.

[0042] Reference Figure 3 As shown, the outer wall of the sealing ring 37910 fits against the inner wall of the cavity 376, and the material of the sealing ring 37910 is fluororubber.

[0043] In this embodiment, the fluororubber sealing ring 37910 at the output end of the hydraulic cylinder 3791 is tightly fitted to the inner wall of the cavity 376 to prevent groundwater or mud from seeping into the device, ensuring the stable operation of the mechanical structure of the limiting component 379, and at the same time avoiding the sample from being contaminated by external impurities.

[0044] Reference Figure 4 As shown, the rectangular hole 377 is connected to the cavity 376, and the size of the rectangular hole 377 is adapted to the size of the limiting claw 3793.

[0045] Reference Figure 2 , Figure 3 As shown, the annular block 371 is slidably connected to the outer wall of the support cylinder 31 through the T-shaped block 372. The cross-sectional dimension of the T-shaped groove 36 is 1.1 times the cross-sectional dimension of the T-shaped block 372, and the roughness Ra of the inner wall of the T-shaped groove 36 is ≤1.6μm.

[0046] In this embodiment, the drive motor 374 on the annular block 371 directly drives the drill rod 375 to rotate and drill, eliminating the need for an additional transmission mechanism and simplifying the operation process; multiple sets of drive motors 374 arranged in a ring can work synchronously, improving drilling efficiency and making it suitable for large-scale exploration scenarios.

[0047] Reference Figure 6 As shown, the tip hardness of the conical needle 3797 on the expansion member 3796 is ≥HRC55, and the elastic coefficient of the telescopic spring 3798 is 5-10N / mm.

[0048] Reference Figure 5 As shown, magnetic component 378 is a permanent magnet or an electromagnet.

[0049] Reference Figure 1 , Figure 2 As shown, a hydraulic cylinder 38 is fixedly installed on the lower surface of the support frame 1, and the output end of the hydraulic cylinder 38 is fixedly connected to the annular block 371.

[0050] In this embodiment, the hydraulic cylinder 38 below the support frame 1 drives the annular block 371 to slide along the T-shaped groove 36 on the outer wall of the support cylinder 31, thereby moving the drill rod 375 up and down to achieve precise control of the drilling depth. The cooperation between the T-shaped groove 36 and the T-shaped block 372 (with a cross-sectional size difference of 1.1 times and an inner wall roughness Ra≤1.6μm) ensures smooth sliding without radial wobbling, thereby improving the verticality of the drilling.

[0051] In operation, by activating hydraulic cylinder 38, the output end of hydraulic cylinder 38 drives the annular block 371, T-block 372, and connecting plate 373 to move downward along the T-slot 36. Simultaneously, the drive motor 374 is activated, driving the drill rod 375 to move towards the formation for drilling. The drill rod 375 stops when it reaches a suitable position, initially fixing its position. Hydraulic cylinder 3791 in the limiting assembly 379 is activated, driving the connecting block 3792, limiting claw 3793, and sealing ring 37910 downward, moving the sealing ring 37910 away from the rectangular hole 377. The limiting claw 3793 extends out of the rectangular hole 377 due to the elastic force of the telescopic spring 3798. Figure 6By energizing the electromagnet 3794, the electromagnet 3794 and the magnetic component 378 are magnetically coupled (e.g., opposite poles attract each other), further "nailing" the limiting claw 3793 to the borehole wall, forming a mechanical clamping force (single claw clamping force ≥1000N), which further enhances the fixing force, forming a dual fixing mode of "magnetic adsorption + mechanical clamping"; because there is moisture in the soil, the limiting claw 3793 is equipped with an expansion component 3796, which expands when it comes into contact with water, and when it expands, it drives... The conical needle 3797 moves obliquely upward to penetrate the pores of the stratum, and uses mechanical wedging to fix the device, which significantly improves the anchoring force in loose soil or fractured rock layers. The conical sandbag 33 can be filled with slag, water or sand through the support cylinder 31 and the arc-shaped hole 34. After storing slag, the weight of the conical sandbag 33 increases (it can accumulate several kilograms to tens of kilograms), which enhances the vertical pressure between the support cylinder 31 and the ground through gravity, thereby improving the overall stability of the device. Especially in loose strata (such as sand and silty clay), the weight of the sandbags can offset some of the horizontal thrust, reducing the risk of tilting of the support cylinder 31; the flexible material (such as canvas or rubber) of the conical sandbags 33 can deform with the unevenness of the ground, filling the gap between the support cylinder 31 and the stratum, forming a passive wedging effect, which is especially suitable for uneven field work surfaces; the gravity fixation of the conical sandbags 33 is a static foundation support, while the "magnetic adsorption + mechanical clamping + expansion anchoring" of the limiting component 379 is a dynamic deep fixation, and the two form a three-dimensional fixation system with upper and lower coordination: the bottom of the support cylinder 31 is stabilized by the gravity of the sandbags; the middle of the drill rod 375 is embedded in the ground by the limiting claw 3793. In the middle of the layer, it resists horizontal displacement; magnetic component 378 and electromagnet 3794 provide radial adsorption force to reduce shaking; the discharge pipe 35 on the outer wall of the conical sandbag 33 can be connected to a negative pressure pump or hose to periodically discharge the stored slag (Figure 3), to avoid the sandbag being too heavy and making it difficult to lift the device, while maintaining the controllability of the gravity fixation effect; the conical sandbag 33 provides a static stability foundation for the support cylinder 31 through the gravity generated by storing slag, combined with the friction between its conical structure and the ground, which is especially suitable for exploration scenarios that require long-term fixation or loose strata. This design complements the dynamic fixation of the limiting component 379, together ensuring the overall rigidity and anti-interference ability of the device during the sampling process;

[0052] Release from fixation: Turn off the power to electromagnet 3794 to stop magnetic coupling; hydraulic cylinder 2 3791 retracts in the reverse direction, driving the limit claw 3793 to retract into the cavity 376, the expansion component 3796 returns to its original shape, the conical needle 3797 detaches from the formation, the telescopic spring 3798 resets, and the limit claw 3793 returns to its position; hydraulic cylinder 1 38 drives the annular block 371 to slide upward, lifting the drill rod 375 and the support cylinder 31 out of the borehole, the conical sandbag 33 can be reused or replaced with the excavated soil, completing one exploration operation (Figure 1).

[0053] 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 fixing device for sampling in hydrogeological exploration, comprising a support frame (1), a sampling structure (2) and a fixing structure (3), characterized in that: The fixed structure (3) includes a support cylinder (31), an annular block (371) is slidably connected to the outer wall of the support cylinder (31), T-shaped blocks (372) are symmetrically fixedly installed on the inner wall of the annular block (371), a number of annularly arranged connecting plates (373) are fixedly connected to the outer wall of the annular block (371), a drive motor (374) is fixedly installed on the number of connecting plates (373), a drill rod (375) is fixedly connected to the output end of the drive motor (374), a cavity (376) is opened in the drill rod (375), a number of annularly arranged rectangular holes (377) are opened on the outer wall of the drill rod (375), magnetic components (378) are symmetrically fixedly installed on the inner walls of the number of rectangular holes (377), and a limit component (379) is provided in the cavity (376). The limiting component (379) includes a second hydraulic cylinder (3791), which is fixedly installed on the inner wall of the cavity (376). Two connecting blocks (3792) are fixedly connected to the outer wall of the output end of the second hydraulic cylinder (3791). Limiting claws (3793) are hinged to the outer walls of the two connecting blocks (3792). Electromagnets (3794) are fixedly installed on the outer walls of both sides of the limiting claws (3793). The upper surface of the limiting claw (3793) is provided with a groove (3795), and an expansion member (3796) and a conical needle (3797) are provided in the groove (3795). The limiting claw (3793) is provided with a telescopic spring (3798). The outer wall of the output end of the hydraulic cylinder (3791) is provided with a number of annularly arranged fixing grooves (3799) below the connecting block (3792). A sealing ring (37910) is fixedly installed on the outer wall of the output end of the hydraulic cylinder (3791) below the connecting block (3792).

2. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: The fixed structure (3) also includes a guide block (32) and a conical sandbag (33). The outer wall of the guide block (32) is fixedly installed on the inner wall of the support cylinder (31). The inner wall of the conical sandbag (33) is fixedly installed on the bottom outer wall of the support cylinder (31). The outer walls of the support cylinder (31) and the conical sandbag (33) are provided with arc-shaped holes (34). The outer wall of the conical sandbag (33) is fixedly connected to a discharge pipe (35). The outer wall of the support cylinder (31) is symmetrically provided with T-shaped grooves (36).

3. The fixing device for sampling in hydrogeological exploration according to claim 2, characterized in that: The guide block (32) is frustoconical and located on one side of the arc-shaped hole (34). The support cylinder (31) is connected to the conical sandbag (33).

4. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: The expansion member (3796) is fixedly installed in the groove (3795) on the upper surface of the limiting claw (3793), and the conical needle (3797) is fixedly installed on the outer wall of the expansion member (3796).

5. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: The two ends of the telescopic spring (3798) are fixedly installed on the lower surface of the limiting claw (3793) and in the fixing groove (3799).

6. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: The outer wall of the sealing ring (37910) fits against the inner wall of the cavity (376), and the sealing ring (37910) is made of fluororubber.

7. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: The rectangular hole (377) is connected to the cavity (376), and the size of the rectangular hole (377) is adapted to the size of the limiting claw (3793).

8. The fixing device for sampling in hydrogeological exploration according to claim 2, characterized in that: The annular block (371) is slidably connected to the outer wall of the support cylinder (31) via the T-shaped block (372). The cross-sectional size of the T-shaped groove (36) is 1.1 times the cross-sectional size of the T-shaped block (372). The roughness Ra of the inner wall of the T-shaped groove (36) is ≤1.6μm.

9. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: The tip hardness of the conical needle (3797) on the expansion member (3796) is ≥HRC55, and the elastic coefficient of the telescopic spring (3798) is 5-10N / mm.

10. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: The magnetic component (378) is a permanent magnet or an electromagnet.

11. The fixing device for sampling in hydrogeological exploration according to claim 1, characterized in that: A hydraulic cylinder (38) is fixedly installed on the lower surface of the support frame (1), and the output end of the hydraulic cylinder (38) is fixedly connected to the annular block (371).

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