Soil layer sampling equipment for geological exploration

Abstract

The invention relates to the technical field of sampling equipment, and discloses geological exploration soil layer sampling equipment which comprises a rack mounted on a vehicle body and at least one drill pipe, the bottom end of the drill pipe is connected with a drill bit, the rack is provided with a movable drilling device driven by a hydraulic cylinder to move up and down, and the middle of the drill bit is hollow. The interior of the drill bit communicates with the interior of the drill pipe, an annular flow guide groove communicating with the lower flow guide groove is formed in the top of the drill bit, and a flow guide hole communicating with the annular flow guide groove is further formed in the drill bit. The middle of the drill bit is designed to be hollow, the interior of the drill bit is communicated with the interior of the drill pipe, uncrushed soil on the inner side of the drill bit forms a to-be-sampled soil column on the inner side of the drill pipe while the drill bit is used for drilling, and the integrity of the to-be-sampled soil is guaranteed on the premise that high-efficiency drilling for sampling deep soil is guaranteed; and the accuracy of a soil sampling survey result is further improved.

Description

Technical Field

[0001] This application relates to the field of sampling equipment technology, and in particular to a soil sampling device for geological exploration. Background Technology

[0002] Geological exploration involves using various methods to investigate and explore the geology, in order to study the geological conditions of a certain area, such as rocks, strata, structures, minerals, hydrology, and landforms. Soil sampling is one of the most commonly used methods in geological exploration, which involves taking soil samples from various depths underground to study the soil samples. However, the soil sampling depth in geological exploration is relatively deep, and simple pipe insertion is not suitable for this sampling requirement, so drilling equipment is needed.

[0003] For example, Chinese invention patent with authorization announcement number CN114739722B discloses a method for sampling soil layers in geological exploration. It uses a motor-driven screw to drill soil and collects the drilled soil for sampling and exploration. However, after drilling soil with the screw, it is easy to cause the soil layers to mix after sampling, which is not conducive to the exploration and research of each soil layer and affects the accuracy of geological exploration results.

[0004] Chinese invention patent CN116448485B discloses a soil stratification sampler. After the sampling rod descends into the soil, it uses several sampling tubes arranged longitudinally at equal intervals on the sampling rod to sample soil at different depths. Although it avoids the mixing of soil layers, it samples the soil layers at intervals, which means that the sampled soil layers are not continuous, which will also affect the accuracy of geological exploration results. Summary of the Invention

[0005] This application proposes a geological exploration soil sampling device, which has the advantages of good sampling effect on deep soil, so as to improve the accuracy of sampling results. It solves the problems that existing equipment is prone to mixing of soil layers when drilling and sampling deep soil, and the problem that sampling intermittent soil samples will affect the accuracy of geological exploration results.

[0006] To achieve the above objectives, this application adopts the following technical solution: a geological exploration soil sampling device, including a frame mounted on a vehicle body and at least one drill pipe, with a drill bit connected to the bottom end of the drill pipe. The frame is equipped with a mobile drilling device that is driven to move up and down by a hydraulic cylinder. The mobile drilling device includes a passive rotating shaft driven to rotate by a motor. The passive rotating shaft has several upper guide grooves arranged in a circular array, and the passive rotating shaft is also equipped with an air inlet that communicates with two of the upper guide grooves.

[0007] The drill pipe has a lower guide groove that communicates with the upper guide groove. The drill bit has a hollow design in the middle and the inside of the drill bit is connected to the inside of the drill pipe. The top of the drill bit has an annular guide groove that communicates with the lower guide groove. The drill bit also has a guide hole that communicates with the annular guide groove.

[0008] During soil sampling, coolant flows sequentially through the upper guide channel, lower guide channel, annular guide channel, and guide hole, cooling the drill bit while simultaneously driving the broken soil upwards and out. At the same time, the unbroken soil inside the drill bit forms a soil column to be sampled inside the drill pipe.

[0009] Furthermore, the mobile drilling device also includes a lower positioning plate and an upper positioning plate arranged vertically. The lower positioning plate is located below the upper positioning plate. The bottom end of the piston shaft of the hydraulic cylinder is fixedly connected to the top of the upper positioning plate. Positioning blocks are fixedly connected to both ends of the lower and upper positioning plates respectively. The passive rotating shaft is rotatably connected to the lower and upper positioning plates through bearings. The lower and upper positioning plates respectively limit the passive rotating shaft to ensure that the passive rotating shaft can rotate stably. At the same time, the hydraulic cylinder drives the piston shaft to move the upper positioning plate up and down, thereby driving the entire mobile drilling device to move up and down.

[0010] Furthermore, two sets of limiting rods are fixedly installed on the frame. Each set of limiting rods has at least two rods. The two limiting rods in the same set are movably connected to a positioning block. Through the limiting action of the limiting rods on the positioning block, the hydraulic cylinder can drive the piston shaft to drive the moving drilling device to move stably up and down.

[0011] Furthermore, a passive gear is fixedly installed on the passive shaft below the lower positioning plate, the motor is fixedly installed on the top of the upper positioning plate, and the output shaft of the motor extends to the bottom of the lower positioning plate and is fixedly installed with a driving gear. The external teeth of the driving gear mesh with the external teeth of the passive gear. The motor drives the output shaft to rotate the driving gear. The meshing action of the driving gear and the passive gear drives the passive gear and the passive shaft to rotate synchronously.

[0012] Furthermore, a rotary joint is fixedly connected to the top end of the passive rotating shaft, and a liquid injection pipe is fixedly connected to the end of the rotary joint away from the passive rotating shaft. When the passive rotating shaft is driven to rotate by the motor, coolant can be continuously injected through the liquid injection pipe.

[0013] Furthermore, the top of the drill tube is provided with a slot, and the bottom end of the passive rotating shaft and the bottom end of the other drill tube can be inserted into the slot. The top of the drill tube is also provided with several insertion holes located in the slot. The insertion holes are arranged in a circumferential array on the drill tube, and the insertion holes are staggered with the lower guide groove. The bottom ends of the passive rotating shaft and the drill tube are respectively fixedly installed with several insertion shafts that are the same number as the insertion holes, corresponding in position and compatible with each other. The lower guide groove at the bottom end of the passive rotating shaft and the insertion shaft at the bottom end of the other drill tube can be inserted into the insertion hole at the top end of one of the drill tubes. When the motor drives the passive rotating shaft to rotate, the passive rotating shaft can drive one or more drill tubes to rotate together as a whole.

[0014] Furthermore, the bottom ends of the passive rotating shaft and the drill pipe are respectively provided with insertion tubes. The inside of the insertion tube at the bottom end of the passive rotating shaft is connected to the inside of the upper guide groove, and the inside of the insertion tube at the bottom end of the drill pipe is connected to the insertion hole. The insertion tube at the bottom end of the passive rotating shaft and the insertion tube at the bottom end of another drill pipe are inserted into the lower guide groove at the top of the drill pipe. After the passive rotating shaft and the drill pipe are inserted, the upper guide groove in the passive rotating shaft is connected to the lower guide groove in the drill pipe. After multiple drill pipes are inserted into each other, the lower guide grooves in the multiple drill pipes are connected.

[0015] Furthermore, the drill pipe has a membrane inside, and the top and bottom of the drill pipe are respectively equipped with annular pressure plates to limit and seal the upper and lower ends of the membrane. A one-way valve is fixedly installed in the lower guide groove of the drill pipe, which is connected to the air inlet. The bottom of the lower guide groove is also equipped with a sealing plug. A transverse guide groove is opened on the drill pipe to connect the lower guide groove and the inside of the drill pipe. When the drill bit finishes drilling, air is injected and pressurized through the air inlet, causing the membrane to expand inward and adhere tightly to the soil, so as to clamp the soil. When the drill pipe is lifted, it can move the soil inside the drill pipe upward together. When the two connected drill pipes are disassembled, the one-way flow of gas in the one-way valve prevents gas leakage in the lower guide groove, ensuring that the expanded membrane in the lower guide groove is always in a state of clamping the soil column. This ensures that the soil column can be sampled as the drill pipe is lifted. At the same time, it is convenient to wrap the soil column with the membrane to ensure that the soil column does not loosen and maintains a complete stratified state, which is conducive to improving the accuracy of subsequent survey data of each soil layer.

[0016] Furthermore, an annular groove is provided in the middle of the inner side of the annular pressure plate so that the annular pressure plate can be easily removed from the drill pipe through the annular groove.

[0017] Furthermore, the outside of the drill pipe is also provided with helical blades. As the helical blades rotate with the drill pipe, the coolant flows back upward on the outside of the drill pipe, which is more conducive to the discharge of soil.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The geological exploration soil sampling device provided in this application has a hollow design in the middle of the drill bit, and the inside of the drill bit is connected to the inside of the drill pipe. When the drill bit is drilled down, the unbroken soil inside the drill bit forms a soil column to be sampled inside the drill pipe. While ensuring high-efficiency drilling for sampling deep soil, it also ensures the integrity of the soil to be sampled, which is conducive to improving the accuracy of soil sampling and survey results.

[0020] 2. By connecting the upper and lower guide grooves of the drill pipe with the guide holes inside the drill bit, when the drill pipe drives the drill bit to rotate and drill the soil, the coolant flows through the lower guide groove and the guide hole in sequence, and then flows out from the outside of the drill pipe upwards, driving the broken soil out. This prevents the broken soil after the drill bit is broken from forming a sediment layer, which could lead to stuck drill or buried drill. This is beneficial for efficient sampling and exploration of deep soil. Attached Figure Description

[0021] 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

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

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the moving drilling device;

[0024] Figure 3 for Figure 2 The front view;

[0025] Figure 4 for Figure 3 A front cross-sectional view of the passive rotating shaft;

[0026] Figure 5 for Figure 2 Bottom view of the passive rotating shaft;

[0027] Figure 6 for Figure 2 Top view of the passive rotating shaft;

[0028] Figure 7 for Figure 1 A schematic diagram of the structure of one of the drill pipes;

[0029] Figure 8 for Figure 7 Top view;

[0030] Figure 9 for Figure 7 A bottom view;

[0031] Figure 10 A cross-sectional schematic diagram of the connection structure between two adjacent drill pipes and the drill bit;

[0032] Figure 11 for Figure 7 A schematic diagram of the right-side cross-section structure;

[0033] Figure 12 for Figure 7 A magnified schematic diagram of the structure at point A;

[0034] Figure 13 for Figure 7 A magnified schematic diagram of the structure at point B.

[0035] In the diagram: 1. Vehicle body; 2. Drill pipe; 201. Slot; 202. Insertion hole; 203. Lower guide channel; 204. Lateral guide channel; 3. Frame; 4. Moving drilling device; 401. Lower positioning plate; 402. Upper positioning plate; 403. Positioning block; 404. Passive rotating shaft; 4041. Upper guide channel; 4042. Inflation channel; 405. Passive gear; 406. Motor; 407. Drive gear; 408. Rotary joint; 409. Injection pipe; 5. Hydraulic cylinder; 6. Limiting rod; 7. Insertion shaft; 8. Insertion pipe; 9. Drill bit; 901. Annular guide channel; 902. Guide hole; 10. Spiral blade; 11. Membrane; 12. Annular pressure plate; 13. One-way valve; 14. Sealing plug. Detailed Implementation

[0036] 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.

[0037] like Figures 1-4A geological exploration soil sampling device includes a vehicle body 1 and several drill pipes 2. A frame 3 is fixedly installed on one side of the front of the vehicle body 1. A movable drilling device 4 is movably installed in the middle of the frame 3. The movable drilling device 4 is driven to move up and down by two hydraulic cylinders 5 installed on the frame 3. The movable drilling device 4 includes a lower positioning plate 401 and an upper positioning plate 402 installed at different heights, with the lower positioning plate 401 located below the upper positioning plate 402. The bottom end of the piston shaft of the hydraulic cylinder 5 is fixedly connected to the top of the upper positioning plate 402. Positioning blocks 403 are fixedly connected to both ends between the lower positioning plate 401 and the upper positioning plate 402. Two sets of limiting rods 6 are fixedly installed on the frame 3. Each set of limiting rods 6 has at least two rods. Two limiting rods 6 in the same set are movably sleeved with a positioning block 403. Through the limiting action of the limiting rods 6 on the positioning block 403, the hydraulic cylinder 5 can drive the piston shaft to move the movable drilling device 4 up and down stably.

[0038] A driven shaft 404 is rotatably connected between the lower positioning plate 401 and the upper positioning plate 402 via a bearing. A driven gear 405 located below the lower positioning plate 401 is fixedly installed on the driven shaft 404. A motor 406 located on one side of the driven shaft 404 is fixedly installed on the top of the upper positioning plate 402. The output shaft of the motor 406 extends below the lower positioning plate 401 and a driving gear 407 is fixedly installed thereon. The external teeth of the driving gear 407 mesh with the external teeth of the driven gear 405. The output shaft driven by the motor 406 drives the driving gear 407 to rotate. The meshing action of the driving gear 407 and the driven gear 405 drives the driven gear 405 and the driven shaft 404 to rotate synchronously. A rotary joint 408 is fixedly connected to the top of the driven shaft 404. A liquid injection pipe 409 is fixedly connected to the end of the rotary joint 408 away from the driven shaft 404, through which coolant is continuously injected.

[0039] Please see Figures 3-6 The passive rotating shaft 404 has several upper guide grooves 4041 arranged in a circular array. There are no fewer than four upper guide grooves 4041. The passive rotating shaft 404 has air inlet grooves 4042 on its front and rear sides respectively. Two of the upper guide grooves 4041 are connected to the air inlet grooves 4042 on the upper guide grooves 4041 respectively. The remaining upper guide grooves 4041 are connected to the injection pipe 409.

[0040] Please see Figures 3-9The top of the drill tube 2 is provided with a slot 201, and the bottom end of the passive rotating shaft 404 and the bottom end of another drill tube 2 can be inserted into the slot 201. The top of the drill tube 2 is also provided with several insertion holes 202 located in the slot 201, and the several insertion holes 202 are distributed in a circumferential array on the drill tube 2. The bottom ends of the passive rotating shaft 404 and the drill tube 2 are respectively fixedly installed with several insertion shafts 7 that are the same number, corresponding in position and compatible with the insertion holes 202. The lower guide groove 203 at the bottom end of the passive rotating shaft 404 and the insertion shaft 7 at the bottom end of the other drill tube 2 can be inserted into the insertion hole 202 at the top end of one of the drill tubes 2. When the motor 406 drives the passive rotating shaft 404 to rotate, the passive rotating shaft 404 can drive one or more drill tubes 2 to rotate together after they are inserted.

[0041] The drill pipe 2 is also provided with several lower guide grooves 203 that connect to the slot 201. The several lower guide grooves 203 are arranged in a circumferential array on the drill pipe 2, and the lower guide grooves 203 are staggered with the insertion hole 202. The passive rotating shaft 404 and the bottom of the drill pipe 2 are respectively provided with insertion tubes 8. The inside of the insertion tube 8 at the bottom of the passive rotating shaft 404 is connected to the inside of the upper guide groove 4041, and the inside of the insertion tube 8 at the bottom of the drill pipe 2 is connected to the insertion hole 202. The insertion tube 8 at the bottom of the passive rotating shaft 404 and the insertion tube 8 at the bottom of another drill pipe 2 are inserted into the lower guide groove 203 at the top of the drill pipe 2. After the passive rotating shaft 404 and the drill pipe 2 are connected, the upper guide groove 4041 in the passive rotating shaft 404 is connected to the lower guide groove 203 in the drill pipe 2. After multiple drill pipes 2 are connected to each other, the lower guide grooves 203 in multiple drill pipes 2 are connected.

[0042] A drill bit 9 is fixedly installed at the bottom end of a drill pipe 2 away from the passive rotating shaft 404. The middle part of the drill bit 9 is hollow, and the interior of the drill bit 9 is connected to the interior of the drill pipe 2. The top of the drill bit 9 is provided with an annular guide groove 901 that connects to the lower guide groove 203. Several guide holes 902 are provided on the drill bit 9 that connect to the annular guide groove 901. The coolant introduced by the injection pipe 409 passes through the rotary joint 408, the upper guide groove 4041, and the lower guide groove 203 in sequence into the annular guide groove 901, and then flows out through the guide holes 902. Thus, when the passive gear 405 drives the passive rotating shaft 404 to rotate the drill pipe 2 and the drill bit 9 to drill and sample soil, the coolant cools the drill bit 9 and helps to remove the loosened soil from the ground. The outside of the drill pipe 2 is also provided with a spiral blade 10. With the rotation of the drill pipe 2, the spiral blade 10 is more conducive to the removal of soil.

[0043] Please see Figures 7-10 The drill pipe 2 is provided with a membrane 11 inside, and the top and bottom ends of the drill pipe 2 are respectively provided with annular pressure plates 12 to limit and seal the upper and lower ends of the membrane 11. An annular groove is provided in the middle of the inner side of the annular pressure plate 12 so that the annular pressure plate 12 can be removed from the drill pipe 2 through the annular groove.

[0044] Please see Figures 11-13 A one-way valve 13 is fixedly installed in the lower guide groove 203 that is connected to the air inlet 4042 on the drill pipe 2, and a sealing plug 14 is also provided at the bottom of the lower guide groove 203. A transverse guide groove 204 is opened on the drill pipe 2 to connect the lower guide groove 203 and the inner side of the drill pipe 2. When the drill bit 9 finishes drilling, air is injected and pressurized through the air inlet 4042 to make the membrane 11 expand inward and stick to the soil so as to clamp the soil. When the drill pipe 2 is lifted, it can drive the soil inside the drill pipe 2 to move upward together.

[0045] In use, first, the diaphragm 11 is placed inside the drill pipe 2. Then, the diaphragm 11 is fixed at both ends of the drill pipe 2 by the annular pressure plate 12, so that the outer side of the diaphragm 11 is tightly attached to the inner side of the drill pipe 2. Next, the drill pipe 2 with the drill bit 9 is fixed to the bottom end of the passive rotating shaft 404 (it can be fixed by bolts on the outside of the drill pipe 2). Then, the passive gear 405 is activated to drive the output rotating shaft to drive the active gear 407 to rotate, which in turn drives the passive gear 405, the passive rotating shaft 404, the drill pipe 2, and the drill bit 9 to rotate. The hydraulic cylinder 5 is controlled to drive the piston shaft to push the moving drilling device 4 to move the drill pipe 2 and the drill bit 9 downward. The rotating drill bit 9 is used to drill the soil. At the same time, coolant is continuously injected through the injection pipe 409. The coolant flows through the rotary joint 408, the passive rotating shaft 404, the lower guide groove 203, the annular guide groove 901, and the guide hole 902 in sequence to cool the drill bit 9 in real time. The returning coolant carries the broken soil upward from the outside of the drill pipe 2 and is discharged. The soil column located inside the drill bit 9 is well preserved inside the membrane 11. When the top of one drill pipe 2 approaches the ground, the drill pipe 2 and the passive rotating shaft 404 are disassembled. The piston shaft is controlled by the hydraulic cylinder 5 to drive the moving drilling device 4 upward. Then, another drill pipe 2 is installed between the previous drill pipe 2 and the passive rotating shaft 404. This process is repeated to continue controlling the drill pipe 2 and the drill bit 9 to drill down to the required depth for exploration and sampling. Finally, drilling is stopped, and air is injected and pressurized through the air inlet 4042 to make the membrane 11 expand inward and tightly adhere to the soil column inside. Thus, when the drill pipe 2 is lifted, the soil column is lifted up together. When disassembling the two connected drill pipes 2, the one-way flow of gas through the one-way valve 13 is used to prevent gas leakage from the outside of the membrane 11 inside the lower drill pipe 2. This keeps the inside of the membrane 11 clamping the soil so that the soil can be extracted completely in sequence. The sampled soil is wrapped by the membrane 11 to prevent it from loosening.

[0046] 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 geological exploration soil sampling device, comprising a frame mounted on a vehicle body and at least one drill pipe, wherein a drill bit is connected to the bottom end of the drill pipe, characterized in that, The frame is equipped with a mobile drilling device that is driven to move up and down by a hydraulic cylinder. The mobile drilling device includes a passive rotating shaft driven to rotate by a motor. The passive rotating shaft has several upper guide grooves arranged in a circular array, and the passive rotating shaft is also equipped with an air inlet that communicates with two of the upper guide grooves. The drill pipe has a lower guide groove that communicates with the upper guide groove. The middle part of the drill bit is hollow and the inside of the drill bit is connected to the inside of the drill pipe. The top of the drill bit has an annular guide groove that communicates with the lower guide groove. The drill bit also has a guide hole that communicates with the annular guide groove. During soil sampling, coolant flows sequentially through the upper guide channel, lower guide channel, annular guide channel, and guide hole, cooling the drill bit while simultaneously driving the broken soil upwards and out. At the same time, the unbroken soil inside the drill bit forms a soil column to be sampled inside the drill pipe.

2. The geological exploration soil sampling equipment according to claim 1, characterized in that, The mobile drilling device also includes a lower positioning plate and an upper positioning plate arranged vertically. The lower positioning plate is located below the upper positioning plate. The bottom end of the piston shaft of the hydraulic cylinder is fixedly connected to the top of the upper positioning plate. Positioning blocks are fixedly connected to both ends of the lower and upper positioning plates. The passive rotating shaft is rotatably connected to the lower and upper positioning plates through bearings. The lower and upper positioning plates limit the passive rotating shaft to ensure that the passive rotating shaft can rotate stably. At the same time, the hydraulic cylinder drives the piston shaft to move the upper positioning plate up and down, thereby moving the entire mobile drilling device up and down.

3. The geological exploration soil sampling equipment according to claim 2, characterized in that, Two sets of limiting rods are fixedly installed on the frame. Each set of limiting rods has at least two rods. The two limiting rods in the same set are movably connected to a positioning block. Through the limiting action of the limiting rods on the positioning block, the hydraulic cylinder can drive the piston shaft to drive the moving drilling device to move up and down stably.

4. The geological exploration soil sampling equipment according to claim 2, characterized in that, A passive gear is fixedly installed on the passive shaft, located below the lower positioning plate. The motor is fixedly installed on the top of the upper positioning plate, and the output shaft of the motor extends to the bottom of the lower positioning plate and is fixedly installed with a driving gear. The external teeth of the driving gear mesh with the external teeth of the passive gear. The motor drives the output shaft to rotate the driving gear. The meshing action of the driving gear and the passive gear drives the passive gear and the passive shaft to rotate synchronously.

5. The geological exploration soil sampling equipment according to claim 1, characterized in that, A rotary joint is fixedly connected to the top end of the passive rotating shaft, and a liquid injection pipe is fixedly connected to the end of the rotary joint away from the passive rotating shaft. When the passive rotating shaft is driven to rotate by the motor, coolant can be continuously injected through the liquid injection pipe.

6. The geological exploration soil sampling equipment according to claim 1, characterized in that, The top of the drill pipe has a slot, and the bottom end of the passive rotating shaft and the bottom end of another drill pipe can be inserted into the slot. The top of the drill pipe also has several insertion holes located in the slot. The insertion holes are arranged in a circumferential array on the drill pipe, and the insertion holes are staggered with the lower guide groove. The bottom ends of the passive rotating shaft and the drill pipe are respectively fixedly installed with several insertion shafts that are the same number as the insertion holes, corresponding in position and compatible with each other. The lower guide groove at the bottom end of the passive rotating shaft and the insertion shaft at the bottom end of the other drill pipe can be inserted into the insertion hole at the top end of one of the drill pipes. When the motor drives the passive rotating shaft to rotate, the passive rotating shaft can drive one or more drill pipes to rotate together as a whole.

7. The geological exploration soil sampling equipment according to claim 6, characterized in that, The passive rotating shaft and the bottom of the drill pipe are respectively provided with insertion tubes. The inside of the insertion tube at the bottom of the passive rotating shaft is connected to the inside of the upper guide groove, and the inside of the insertion tube at the bottom of the drill pipe is connected to the insertion hole. The insertion tube at the bottom of the passive rotating shaft and the insertion tube at the bottom of another drill pipe are inserted into the lower guide groove at the top of the drill pipe. After the passive rotating shaft and the drill pipe are inserted, the upper guide groove in the passive rotating shaft is connected to the lower guide groove in the drill pipe. After multiple drill pipes are inserted into each other, the lower guide grooves in the multiple drill pipes are connected.

8. The geological exploration soil sampling equipment according to claim 1, characterized in that, The drill pipe has a membrane inside, and the top and bottom of the drill pipe are respectively equipped with annular pressure plates to limit and seal the upper and lower ends of the membrane. A one-way valve is fixedly installed in the lower guide groove of the drill pipe, which is connected to the air inlet. The bottom of the lower guide groove is also equipped with a sealing plug. A transverse guide groove is opened on the drill pipe to connect the lower guide groove and the inside of the drill pipe. When the drill bit finishes drilling, air is injected and pressurized through the air inlet, causing the membrane to expand inward and adhere tightly to the soil, so as to clamp the soil. When the drill pipe is lifted, it can move the soil inside the drill pipe upward together. When the two connected drill pipes are disassembled, the one-way flow of gas in the one-way valve prevents gas leakage in the lower guide groove, ensuring that the expanded membrane in the lower guide groove is always in a state of clamping the soil column. This ensures that the soil column can be sampled as the drill pipe is lifted. At the same time, it is convenient to wrap the soil column with the membrane to ensure that the soil column does not loosen and maintains a complete stratified state, which is conducive to improving the accuracy of subsequent survey data of each soil layer.

9. The geological exploration soil sampling equipment according to claim 8, characterized in that, The annular pressure plate has an annular groove in the middle of its inner side, so that the annular pressure plate can be easily removed from the drill pipe through the annular groove.

10. The geological exploration soil sampling equipment according to claim 1, characterized in that, The outside of the drill pipe is also equipped with helical blades. As the helical blades rotate with the drill pipe, the coolant flows back upward on the outside of the drill pipe, which is more conducive to the discharge of soil.

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