Geological survey sampling device

By combining a spiral conveyor and a lifting assembly, the problem of low automation in existing geological exploration sampling devices is solved, enabling automated sample extraction and real-time monitoring, thereby improving the efficiency and intelligence level of geological exploration.

CN121783598APending Publication Date: 2026-04-03JINCHUAN GROUP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-17
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Existing geological exploration sampling equipment has a low degree of automation, and soil samples inside the sampler are not easy to be automatically removed, which can easily introduce impurities.

Method used

It adopts a combined structure of a spiral conveyor rod, a drill bit, a conveyor housing, and a lifting assembly. The spiral conveyor rod is driven to rotate by the rotating assembly, and the lifting assembly drives the drill bit to rise and fall. Combined with a spring structure, it realizes automatic sample delivery and retrieval.

Benefits of technology

It enables automated sample extraction, saving manpower and time costs, improving the efficiency of geological exploration, and achieving real-time monitoring and intelligent analysis through soil testing sensors.

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Abstract

The invention relates to the technical field of geological survey sampling equipment, and particularly discloses a geological survey sampling device which comprises a drill bit, a spiral conveying rod, a conveying shell, a rotating assembly and a lifting assembly, the drill bit is connected to the lower portion of the spiral conveying rod, and the spiral conveying rod is connected with the rotating assembly; the rotating assembly is used for driving the spiral conveying rod to rotate, the rotating assembly is connected with the lifting assembly, the lifting assembly is used for driving the rotating assembly to ascend and descend, and the conveying shell is arranged outside the spiral conveying rod and used for being matched with the spiral conveying rod to convey samples drilled by the drill bit. The device is convenient for sampling, and soil in the sampler is convenient to take out.
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Description

Technical Field

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

[0002] Soil testing is becoming increasingly important in fields such as geological exploration, agriculture, and ecological environmental protection. Existing geological exploration sampling equipment has a low degree of automation, making it inconvenient to use. Samples stored during soil sampling are not easily extracted automatically from the sampler, and impurities are easily introduced. Summary of the Invention

[0003] The purpose of this invention is to provide a geological exploration sampling device that facilitates sampling and the removal of soil from the sampler.

[0004] The objective of this invention can be achieved through the following technical solutions: A geological exploration sampling device includes a drill bit, a spiral conveying rod, a conveying housing, a rotating assembly, and a lifting assembly. The drill bit is connected to the lower part of the spiral conveying rod. The spiral conveying rod is connected to the rotating assembly, which drives the spiral conveying rod to rotate. The rotating assembly is connected to the lifting assembly, which drives the rotating assembly to move up and down. The conveying housing is disposed outside the spiral conveying rod and is used to cooperate with the spiral conveying rod to convey the sample drilled by the drill bit.

[0005] In a further embodiment, the rotating assembly includes a motor, a belt, a driving pulley, a driven pulley, and a first support frame. The first support frame is connected to the lifting assembly, the motor housing is connected to the first support frame, the driving pulley is connected to the motor shaft, the driven pulley is connected to the upper end of the screw conveyor, and the belt is connected between the driving pulley and the driven pulley.

[0006] In a further embodiment, the lifting assembly includes a second support frame, a drive mechanism, a sliding sleeve, and a reciprocating lead screw. The second support frame is mounted on the ground, and a through hole for the drill bit to pass through is provided in the middle of the second support frame. One end of the first support frame is slidably connected to the second support frame. The end of the reciprocating lead screw is rotatably connected to the second support frame. The middle of the reciprocating lead screw passes through the inside of the sliding sleeve and is drivenly connected to the sliding sleeve. The outside of the sliding sleeve is connected to the other end of the first support frame. The drive mechanism is fixedly connected to the reciprocating lead screw and is located outside the preset stroke of the sliding sleeve.

[0007] In a further embodiment, the driving mechanism is a turntable.

[0008] In a further embodiment, the drive mechanism includes a gear set, which contains multiple meshing gears. One end of the gear set is connected to the reciprocating lead screw, and the other end of the gear set is coaxially connected to the drive pulley.

[0009] In a further embodiment, the second support frame includes a support rod and a base plate. The base plate is rotatably connected to the reciprocating lead screw. The base plate is provided with a through hole for the drill bit to pass through, and the support rod is fixed to the base plate.

[0010] In a further embodiment, the second support frame also includes a limiting plate and a spring. One side of the limiting plate is slidably connected to the middle of the support rod, and the bottom of the limiting plate is connected to the top of the conveying housing. The spring is disposed between the bottom plate and the limiting plate, and both ends of the spring are elastically connected to the bottom plate and the limiting plate, respectively. A roller is provided at the bottom of the limiting plate.

[0011] In a further embodiment, a geological exploration sampling device also includes a cooling component disposed above the drill bit for cooling the drill bit.

[0012] In a further embodiment, the cooling assembly includes a water outlet pipe connected to the wall of the conveying housing.

[0013] In a further embodiment, the cooling assembly also includes a water storage tank, a drain pipe, and an automatic switching valve. The water storage tank is supported on the rotating assembly. One end of the drain pipe is connected to the water storage tank, and the other end of the drain pipe is connected to one end of the automatic switching valve. The other end of the automatic switching valve is connected to the end of the water outlet pipe away from the drill bit. The automatic switching valve is used to control the opening or closing of the water outlet pipe.

[0014] The beneficial effects of this invention are: This invention utilizes a spiral conveyor rod, a drill bit, and a conveying housing to facilitate the temporary storage of samples drilled by the drill bit within the conveying housing. A rotating component facilitates automatic sample drilling, and a lifting component allows the drill bit to move up and down during rotation. Based on the spiral conveyor rod, this makes it easier for the drill bit to penetrate deeper into the soil or be retrieved from the soil.

[0015] The rotating and lifting components of this invention have simple structures and are easy to control to achieve automatic sampling by the drill bit.

[0016] This invention utilizes the cooperation of a spiral conveying rod, a conveying housing, and a spring. When the lifting assembly returns to its original position, it drives the spiral conveying rod upward. Simultaneously, during the spring's return process, it drives the conveying housing upward, allowing the sample taken from the bottom of the drill bit to fall down without manual intervention. This significantly saves manpower and time costs and improves geological exploration efficiency. In addition, the spring can be used to press the conveying housing against the drilling area, facilitating the entry of soil samples taken from the bottom of the spiral conveying rod and the top of the drill bit into the conveying housing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a geological exploration and sampling device according to an embodiment of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the structure at point A in the middle; Figure 3 For the present invention Figure 1 Schematic diagram of the structure at point B; Figure 4 This is a schematic diagram of the connection of the rotating component in an embodiment of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point C; Figure 6 This is a schematic cross-sectional view of the inside of the conveying housing in an embodiment of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point D; Figure 8 This is a schematic cross-sectional view of the inside of the water intake pipe in an embodiment of the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of the structure at point E in the middle; In the diagram: 1. Base plate; 101. Perforation; 2. Support rod; 3. First support frame; 4. Spiral conveyor rod; 5. Drill bit; 6. Driving pulley; 7. Driven pulley; 8. Belt; 9. Soil detection sensor; 10. Spiral blade structure; 11. Reciprocating screw; 12. Sliding sleeve; 13. Gear set; 14. Gear; 15. Limiting plate; 16. Conveying housing; 17. Spring; 18. Second cylindrical tube; 19. Water outlet pipe; 20. Water storage tank; 21. Drainage pipe; 22. First cylindrical tube; 23. Water intake pipe; 231. Water passage hole; 24. Cylindrical block; 241. V-shaped groove; 25. Movable block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] A geological exploration sampling device, comprising, for example Figure 1 The drill bit 5, the auger conveyor 4, the conveyor housing 16, the rotating assembly, and the lifting assembly are shown in the attached document. Figure 1 The drill bit 5 shown is connected to the lower part of the spiral conveying rod 4. The spiral conveying rod 4 is connected to the rotating assembly, which drives the spiral conveying rod 4 to rotate. The rotating assembly is connected to the lifting assembly, which drives the rotating assembly to lift. The conveying housing 16 is disposed outside the spiral conveying rod 4 and is used to cooperate with the spiral conveying rod 4 to convey the sample drilled by the drill bit 5.

[0021] Its working principle is as follows: the rotating component drives the spiral conveyor rod 4 to rotate, which in turn drives the drill bit 5 to rotate. The drill bit 5 drills into the ground. The lifting component drives the rotating component to rise and fall, thereby raising and lowering the drill bit 5 to penetrate deep into the ground, loosening the soil. The drilled soil is transported to the conveying housing 16 for temporary storage in cooperation with the spiral conveyor rod 4, thus achieving sampling. This structure is simple, and the rotating component and lifting component can be automated to achieve automated sampling. The spiral conveyor rod 4 can have a spiral blade structure 10 at the end near the drill bit 5, or the entire rod body can have a spiral blade structure 10 on most of the part near the drill bit 5.

[0022] Based on the above working principle, some embodiment structures or implementation methods are provided: In some embodiments, the rotating assembly includes a motor and, as shown in the figure, a rotating component. Figure 6The diagram shows a belt 8, a drive pulley 6, a driven pulley 7, and a first support frame 3. The first support frame 3 is connected to the lifting assembly, and the motor housing is connected to the first support frame 3. The drive pulley 6 is connected to the motor shaft, and the driven pulley 7 is connected to the upper end of the spiral conveyor rod 4. The belt 8 connects the drive pulley 6 and the driven pulley 7. The motor drives the drive pulley 6 to rotate, which in turn drives the driven pulley 7 via the belt 8. The driven pulley 7 then drives the spiral conveyor rod 4, which in turn drives the drill bit 5. This structure is simple, the motor can be automatically controlled, and the degree of automation is high. The belt 8 can withstand a large torque during drilling without jamming and causing drilling interruption, thus ensuring good safety.

[0023] In some embodiments, the lifting assembly includes a second support frame, a drive mechanism, and such as Figure 1 The sliding sleeve 12 and reciprocating lead screw 11 are shown. The second support frame is used for mounting on the ground, and the middle part of the second support frame is provided for... Figure 2 The drill bit 5 passes through a through hole 101, as shown in Figure 1. One end of the first support frame 3 is slidably connected to the second support frame. The end of the reciprocating screw 11 is rotatably connected to the second support frame. The middle part of the reciprocating screw 11 passes through the interior of the sliding sleeve 12 and is drivenly connected to the sliding sleeve 12. The exterior of the sliding sleeve 12 is connected to the other end of the first support frame 3. The drive mechanism is fixedly connected to the reciprocating screw 11 and is located outside the preset stroke of the sliding sleeve 12. The drive mechanism drives the reciprocating screw 11 to rotate, causing the sliding sleeve 12 and the first support frame 3 to slide on the second support frame, thereby realizing the lifting and lowering of the entire rotating assembly. The drive mechanism can be an automated mechanism to facilitate the automatic lifting and lowering of the entire drill bit 5.

[0024] In some embodiments, the driving mechanism is a turntable. Turntables have a simple structure and can be used to drive applications where low downward pressure is not required. Figure 1 The reciprocating lead screw 11 shown rotates.

[0025] In some embodiments, the drive mechanism includes, for example, Figure 3 The gear set 13 shown includes a plurality of meshing gears 14, one end of which is connected to... Figure 1 The reciprocating lead screw 11 shown is connected to the gear set 13, and the other end of the gear set 13 is coaxially connected to the drive pulley 6. The specific number of gears 14 and their teeth, and other related parameters within the gear set 13, can be determined based on the drilling stroke, as shown below. Figure 1 The stroke of the sliding sleeve 12 and drill bit 5 is shown. Then, consult the mechanical design manual and select the appropriate number and type of gears 14 from the national standard. For example... Figure 1As shown, the gear set 13 consists of two gears 14, which realize the fixed-axis rotation of the spiral conveyor rod 4 and the drill bit 5 and the uniform lifting and lowering movement.

[0026] In some embodiments, the second support frame includes, for example, Figure 1 The support rod 2 and base plate 1 are shown. The base plate 1 is rotatably connected to the reciprocating lead screw 11. The base plate 1 is provided with a through hole 101 for the drill bit 5 to pass through, which facilitates the passage of the drill bit 5. Generally, the through hole 101 should also facilitate the passage of the conveying housing 16. The support rod 2 is fixed to the base plate 1. The support rod 2 provides support and motion guidance for the helical conveying rod 4, the drill bit 5 and related mechanisms. Here, the base plate 1 can also be replaced with a frame structure, mainly used to support the entire rotating device.

[0027] In some embodiments, the second support frame further includes a limiting plate 15 and a spring 17. One side of the limiting plate 15 is slidably connected to the middle of the support rod 2, and the bottom of the limiting plate 15 is connected to the top of the conveying housing 16. The spring 17 is disposed between the bottom plate 1 and the limiting plate 15, and both ends of the spring 17 are elastically connected to the bottom plate 1 and the limiting plate 15, respectively. A roller is provided at the bottom of the limiting plate 15, which facilitates the movement of the entire device. When the lifting assembly returns to its original position, it drives the spiral conveying rod 4 to move upward. At the same time, during the return process of the spring 17, it drives the conveying housing 16 upward, so that the sample taken from the bottom of the drill bit 5 can fall down without manual intervention, greatly saving manpower and time costs and improving the efficiency of geological exploration. In addition, the spring 17 can be used to drive the conveying housing 16 to press the drilling area, making it easier for the sampled soil at the bottom of the spiral conveying rod 4 and above the drill bit 5 to enter the conveying housing 16.

[0028] In some embodiments, a geological exploration sampling apparatus further includes a cooling component, the cooling component being disposed as follows: Figure 4 The area above the drill bit 5 is used for cooling the drill bit 5. This ensures that the drill bit 5 is not easily damaged when drilling through hard strata such as hard rock layers, and also facilitates cooling of the drill bit 5, allowing it to work efficiently and continuously.

[0029] In some embodiments, the cooling assembly includes, for example, Figure 7 The water outlet pipe 19 shown is connected to the wall of the conveying housing 16, mainly for the convenience of the water outlet pipe 19. It is conceivable that the water outlet pipe 19 can be fixed to other structures, as long as its outlet is aligned with the drill hole of the drill bit 5.

[0030] In some embodiments, the cooling assembly further includes, for example, Figure 6The diagram shows a water storage tank 20, a drain pipe 21, and an automatic switching valve. The water storage tank 20 is supported on the rotating assembly. One end of the drain pipe 21 is connected to the water storage tank 20, and the other end is connected to one end of the automatic switching valve. The other end of the automatic switching valve is connected to the end of the water outlet pipe 19 furthest from the drill bit 5. The automatic switching valve controls the opening and closing of the water outlet pipe 19. By storing water in the water storage tank 20 and facilitating the opening and closing of the water outlet pipe 19 via the automatic switching valve, the drill bit 5 can be cooled at any time.

[0031] In some embodiments, the automatic switching valve may be an electric valve. In some embodiments, the electric switching valve may include, for example, Figure 8 The diagram shows a first cylindrical pipe 22, a second cylindrical pipe 22, a water intake pipe 23, a cylindrical block 24, and a movable block 25. The cylindrical block 24 is coaxially connected to the driven pulley 7, and the cylindrical block 24 is provided with... Figure 5 The V-shaped groove 241 shown has one end of the movable block 25 connected to it, and the other end connected to the middle of the water intake pipe 23. One end of the water intake pipe 23 is slidably and sealed to one end of the first cylindrical pipe 22, and the other end of the first cylindrical pipe 22 is connected to the drain pipe 21. The other end of the water intake pipe 23 is slidably and sealed to one end of the second cylindrical pipe 22. The second cylindrical pipe 22 is mounted on the first support frame 3 and passes through the first support frame 3 and the limiting plate 15 before connecting to the water outlet pipe 19. The wall of the water intake pipe 23 is provided with... Figure 9 The water inlet 231 is shown. The end of the water inlet pipe 23 near the drain pipe 21 is sealed. The outer wall of the water inlet pipe 23 forms a piston structure with the first cylindrical pipe 22 and the second cylindrical pipe 22. When the water inlet 231 corresponds to the drain pipe 21, the water in the drain pipe 21 can flow into the water inlet pipe 23, and then be led out to the outlet pipe 19 through the second cylindrical pipe 22. The driven pulley 7 drives the cylindrical block 24 to rotate. The cylindrical block 24 drives the movable block 25 to move up and down through the V-shaped groove 241, thereby causing the water inlet 231 on the water inlet pipe 23 to correspond with the drain pipe 21, so that the water inlet pipe 23 and the drain pipe 21 are connected. Or they do not correspond, so that the water inlet pipe 23 and the drain pipe 21 are not connected, and the water outlet pipe 19 is shut off. This utilizes the rotation of the driven pulley 7 to achieve automatic valve switching and step-by-step water supply operation, which facilitates automatic control of water supply flow. At the same time, it allows water to be quickly pressed into the drill bit 5 through the closed end of the water intake pipe 23, effectively reducing the temperature of the drill bit 5. When step-by-step water supply is not needed, only the cylindrical block 24 needs to be removed.

[0032] In some implementations, such as Figure 2 The drill bit 5 shown can be equipped with a soil detection sensor 9, which can collect parameters of soil at different depths in real time.

[0033] The soil sensor 9 can collect parameters of soil at different depths in real time and transmit them remotely to an external control display through a signal transmission system, enabling real-time monitoring and intelligent analysis of soil parameters.

[0034] In addition to existing humidity, temperature, conductivity, and pH sensors, the soil testing sensor 9 can integrate more types of sensors, such as soil heavy metal detection sensors and soil microbial sensors, to achieve more comprehensive soil parameter detection.

[0035] In some embodiments, pneumatic or hydraulic drive may also be considered, using pneumatic or hydraulic cylinders to push, for example... Figure 6 The sample inside the conveying housing 16 shown is automatically discharged.

[0036] The part drawings in the above figures are all schematic drawings. The specific shapes and structures can be made by referring to the existing structures of the same parts. For example, the spiral conveyor rod 4 and the drill bit 5 in the figure are schematic drawings. The specific spiral structure can be made by referring to the existing spiral conveyor structure of the ground dragon and the structure of the ground drill bit 5.

[0037] The entire device has: 1. High degree of automation: The present invention achieves automatic extraction of samples from inside the sampling container through the cooperation of the spiral blade and the return spring 17, without the need for manual intervention, which greatly saves manpower and time costs and improves the efficiency of geological exploration.

[0038] 2. High level of intelligence: The soil detection sensor 9 on the drill bit 5 can collect soil parameters at different depths in real time and transmit them remotely to an external control display through a signal transmission system, realizing real-time monitoring and intelligent analysis of soil parameters, and providing more timely and accurate decision support for geological exploration.

[0039] 3. High safety: The cooling component can effectively reduce the temperature of the drill bit 5, extend the service life of the drill bit 5, avoid damage or safety accidents caused by overheating of the drill bit 5, and ensure the smooth progress of geological exploration work.

[0040] 4. High operational flexibility: Through the cooperation of the rotating component and the lifting component, the drill rod and drill bit 5 can rotate on a fixed axis and move at a uniform speed. Personnel can remotely control and adjust parameters through an external control display to achieve intelligent adjustment of drilling depth, speed and force, thereby improving drilling efficiency and accuracy.

[0041] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A geological exploration sampling device, characterized in that, The device includes a drill bit (5), a spiral conveying rod (4), a conveying housing (16), a rotating assembly, and a lifting assembly. The drill bit (5) is connected to the lower part of the spiral conveying rod (4). The spiral conveying rod (4) is connected to the rotating assembly, which is used to drive the spiral conveying rod (4) to rotate. The rotating assembly is connected to the lifting assembly, which is used to drive the rotating assembly to lift. The conveying housing (16) is located outside the spiral conveying rod (4) and is used to cooperate with the spiral conveying rod (4) to convey the sample drilled by the drill bit (5).

2. The geological exploration sampling device according to claim 1, characterized in that, The rotating assembly includes a motor, a belt (8), a drive pulley (6), a driven pulley (7), and a first support frame (3). The first support frame (3) is connected to the lifting assembly. The housing of the motor is connected to the first support frame (3). The drive pulley (6) is connected to the motor shaft. The driven pulley (7) is connected to the upper end of the screw conveyor (4). The belt (8) is connected between the drive pulley (6) and the driven pulley (7).

3. The geological exploration sampling device according to claim 2, characterized in that, The lifting assembly includes a second support frame, a drive mechanism, a sliding sleeve (12), and a reciprocating screw (11). The second support frame is used to be set on the ground. The middle part of the second support frame is provided with a through hole (101) for the drill bit (5) to pass through. One end of the first support frame (3) is slidably connected to the second support frame. The end of the reciprocating screw (11) is rotatably connected to the second support frame. The middle part of the reciprocating screw (11) passes through the inside of the sliding sleeve (12) and is drivenly connected to the sliding sleeve (12). The outside of the sliding sleeve (12) is connected to the other end of the first support frame (3). The drive mechanism is fixedly connected to the reciprocating screw (11) and is located outside the preset stroke of the sliding sleeve (12).

4. A geological exploration sampling device according to claim 3, characterized in that, The driving mechanism is a turntable.

5. A geological exploration sampling device according to claim 3, characterized in that, The drive mechanism includes a gear set (13), which includes a plurality of meshing gears (14). One end of the gear set (13) is connected to the reciprocating lead screw (11), and the other end of the gear set (13) is coaxially connected to the drive pulley (6).

6. A geological exploration sampling device according to claim 3, characterized in that, The second support frame includes a support rod (2) and a base plate (1). The base plate (1) is rotatably connected to the reciprocating lead screw (11). The base plate (1) is provided with a through hole (101) for the drill bit (5) to pass through. The support rod (2) is fixed on the base plate (1).

7. A geological exploration sampling device according to claim 6, characterized in that, The second support frame also includes a limiting plate (15) and a spring (17). One side of the limiting plate (15) is slidably connected to the middle of the support rod (2). The bottom of the limiting plate (15) is connected to the top of the conveying housing (16). The spring (17) is disposed between the bottom plate (1) and the limiting plate (15), and both ends of the spring (17) are elastically connected to the bottom plate (1) and the limiting plate (15) respectively. The bottom of the limiting plate (15) is provided with rollers.

8. A geological exploration sampling device according to claim 1, characterized in that, It also includes a cooling assembly disposed above the drill bit (5) for cooling the drill bit (5).

9. A geological exploration sampling device according to claim 8, characterized in that, The cooling assembly includes a water outlet pipe (19) connected to the wall of the delivery housing (16).

10. A geological exploration sampling device according to claim 9, characterized in that, The cooling assembly also includes a water storage tank (20), a drain pipe (21), and an automatic switching valve. The water storage tank (20) is supported on the rotating assembly. One end of the drain pipe (21) is connected to the water storage tank (20), and the other end of the drain pipe (21) is connected to one end of the automatic switching valve. The other end of the automatic switching valve is connected to the end of the water outlet pipe (19) away from the drill bit (5). The automatic switching valve is used to control the opening or closing of the water outlet pipe (19).