Multifunctional core drilling and sampling device and method for geophysical exploration

Abstract

The invention discloses a multifunctional core drilling and sampling device and method for geophysical exploration, and the device comprises a vehicle frame, a box body is arranged on the vehicle frame, wheels are arranged at the bottom of the vehicle frame, a hand-push frame is fixedly arranged at the upper part of the rear side of the vehicle frame, a box door is arranged at the left side of the box body, and a solar cell panel is arranged at the top of the box body. A soft geological material sampler, a hard geological material sampler, a water tank, a jet cutting high-pressure water pump, a switching high-pressure water pump, a storage battery and a solar charging and discharging controller are arranged in the box body. The device is scientific in principle and easy to operate, the trolley is adopted as a bearing body of the water tank, the storage battery, the jet cutting high-pressure water pump and the switching high-pressure water pump, an energy source is provided for the soft geological material sampler and the hard geological material sampler, and the soft geological material sampler and the hard geological material sampler are both operated in a handheld mode. The device is simple in structure and convenient to operate, can perform long-distance sampling operation, performs corresponding core drilling sampling according to different geologies, is wide in application range, and provides a complete cylindrical sample for geophysical exploration operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of geophysical exploration, and in particular relates to a multifunctional core sampling device and method for geophysical exploration. Background Art

[0002] Geophysical exploration, also known as geophysical prospecting, involves studying and observing changes in various geophysical fields to detect geological conditions such as lithology and geological structure. Patent No. 202120534075.3 (Grant Notice No. CN214952250U) discloses a geophysical exploration vehicle with a drilling and sampling function. However, its technical solution has the following problems or deficiencies: 1) The fixed installation box of the sampling part is fixed on the front side of the exploration vehicle. Drilling sampling can only be carried out from top to bottom in the places where the exploration vehicle can move. Sampling cannot be carried out in places that are difficult for the exploration vehicle to reach or on the side walls of the mountain, which limits the scope of drilling sampling.

[0003] 2) It can only drill holes to take samples of soil, but cannot take samples of hard rocks, which limits the diversity of sampling.

[0004] 3) The drilling sampling produces debris, which is mixed together. It is not only difficult to collect, but also because the samples are debris, it is difficult to distinguish the layered structure of the debris when testing the samples. Summary of the Invention

[0005] In order to solve the above technical problems existing in the prior art, the present invention provides a multifunctional core sampling device and method for geophysical exploration, which has a wide sampling range and can sample different types of geology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a multifunctional core sampling device for geophysical exploration, comprising a frame, a box body is provided on the frame, wheels are provided at the bottom of the frame, a trolley is fixedly provided on the upper rear side of the frame, a box door is provided on the left side of the box body, a solar panel is provided on the top of the box body, a soft geological material sampler, a hard geological material sampler, a water tank, a jet cutting high-pressure water pump, a switching high-pressure water pump, a battery and a solar charge and discharge controller are provided in the box body, the solar panel charges the battery through the solar charge and discharge controller, the battery supplies power to the soft geological material sampler, the hard geological material sampler, the jet cutting high-pressure water pump and the switching high-pressure water pump respectively through the solar charge and discharge controller, the jet cutting high-pressure water pump draws clean water from the water tank to provide cutting jet water for the hard geological material sampler during the sampling process, the switching high-pressure water pump draws clean water from the water tank to switch the hard geological material sampler to perform vertical jet cutting or horizontal jet cutting.

[0007] Furthermore, the box body is divided into a front upper chamber, a front lower chamber, a rear upper chamber and a rear lower chamber by horizontal partitions and vertical partitions. The high-pressure water pump and the hard geological material sampler are arranged in the front upper chamber, the water tank is arranged in the front lower chamber, the soft geological material sampler is arranged in the rear upper chamber, the battery and the solar charge and discharge controller are arranged in the rear lower chamber, and a first through-hole connecting the rear upper chamber and the bottom of the solar cell panel is provided on the top of the box body, and a second through-hole connecting the rear upper chamber and the rear lower chamber is provided on the rear side of the horizontal partition. The solar panel and the solar charge and discharge controller are connected by a charging cable that passes through the first through-hole, the rear upper chamber and the second through-hole from top to bottom in sequence. A third through-hole connecting the front upper chamber and the front lower chamber for passing water pipes and electric wires is provided on the front side of the horizontal partition, and a fourth through-hole connecting the front lower chamber and the rear lower chamber for passing electric wires is provided at the lower part of the vertical partition.

[0008] Furthermore, the soft geological material sampler includes a hollow shaft motor and a single-layer coring barrel. A pressing handle is respectively provided on the left and right sides of the outer shell of the hollow shaft motor. The main shaft of the hollow shaft motor is a hollow main shaft that is transparent from top to bottom. The inner hole of the hollow main shaft is coaxially installed with a drive shaft through a spline structure. The single-layer coring barrel is a cylindrical structure with an open lower end. The lower end of the drive shaft is coaxially fixedly connected to the upper end of the single-layer coring barrel. The lower outer circle of the drive shaft and the upper end face of the single-layer coring barrel are fixedly connected by at least three ribs in a circumferential array. The upper end of the drive shaft extends out of the upper end of the hollow main shaft. The outer circle of the upper end of the drive shaft is provided with a detachable fastening assembly connected to the upper end of the hollow main shaft.

[0009] Furthermore, the detachable fastening assembly includes a compression nut and a lock nut both threadedly connected to the outer circle of the upper end of the drive shaft, the lower end of the compression nut is press-fitted to the upper end surface of the hollow main shaft, the lower end of the lock nut is press-fitted to the upper end of the compression nut, and the lower end surface of the hollow main shaft is press-fitted to the upper ends of all the ribs; The annular surface at the lower end of the single-layer coring barrel is provided with a plurality of mounting grooves along the circumference. A diamond cutter head is installed and welded in each mounting groove. The maximum rotation diameter of all diamond cutter heads is larger than the outer diameter of the single-layer coring barrel. The inner circle rotation trajectory of all diamond cutter heads is a conical surface with a smaller top and a larger bottom. The port diameter on the conical surface is equal to the inner diameter of the single-layer coring barrel. The outer circle of the single-layer coring barrel is provided with a shallow spiral chip removal groove. The driving shaft is a round tube that is transparent from top to bottom. A center hole corresponding to the lower end of the driving shaft is opened on the top of the single-layer coring barrel. A pushing rod is provided in the driving shaft. The lower end of the pushing rod passes through the center hole and is fixedly connected to a push plate located in the single-layer coring barrel. The push plate is connected to the top of the single-layer coring barrel by at least two positioning bolts. The upper end of the pushing rod is flush with the upper end of the driving shaft. A positioning notch is provided between the upper end of the pushing rod and the upper end of the pushing rod. An internal threaded hole for connecting an extended push rod is provided in the center of the upper end of the driving shaft.

[0010] Furthermore, the hard geological material sampler includes an installation box, a double-layer coring barrel, a rotary drive motor and a three-channel coaxial sealing joint. Two operating handles are symmetrically provided on the left and right sides of the installation box. The lower end of the double-layer coring barrel is open. The top of the double-layer coring barrel is coaxially fixedly connected to the three-channel rotating shaft. The upper part of the three-channel driving shaft extends into and is rotatably connected in the installation box. The rotary drive motor is arranged in the installation box. The rotary drive motor is connected to the three-channel rotating shaft through a transmission mechanism. The lower end of the three-channel coaxial sealing joint is arranged in the installation box and is coaxially connected to the upper end rotary seal of the three-channel rotating shaft through a coaxial transmission. There are two high-pressure water pumps, one high-pressure water pump is a switching high-pressure water pump, and the other high-pressure water pump is a jet cutting high-pressure water pump. The switching high-pressure water pump is connected to an interface of the three-channel coaxial sealing joint through a switching tube, and the jet cutting high-pressure water pump is connected to the other two interfaces of the three-channel coaxial seal through a two-position three-way solenoid valve and a high-pressure hose.

[0011] Furthermore, the double-layer coring barrel includes an inner barrel and an outer barrel arranged coaxially, an annular cavity is formed between the outer circle of the inner barrel and the inner circle of the outer barrel, a disc cavity is formed between the upper surface of the inner barrel top and the lower surface of the outer barrel top, a sealing ring is provided at the lower end of the annular cavity, the lower end face of the sealing ring, the lower end face of the inner barrel and the lower end face of the outer barrel are flush, an annular injection pipe is provided on the top surface of the sealing ring in the annular cavity, a plurality of water inlets are provided on the top of the annular injection pipe, the inner circle of the annular injection pipe is slidably sealed with the outer circle of the inner barrel, a plurality of groups of vertical cutting jet holes are uniformly provided in the sealing ring along the circumferential direction, and an axial transition hole corresponding to each group of vertical cutting jet holes is provided on the bottom surface of the annular injection pipe, and the upper surface of the sealing ring is circumferentially At least three arc-shaped grooves are evenly arranged. A guide column extending into the arc-shaped groove is fixedly arranged on the bottom surface of the annular injection tube. A first spring is arranged in the arc-shaped groove. The two ends of the first spring are respectively press-fitted with one end of the arc-shaped groove and the outer circle of the guide column. A plurality of radial transition holes are evenly opened on the inner wall of the annular injection tube along the circumferential direction. The inner wall of the inner tube is evenly opened along the circumferential direction with radial cutting jet holes that are vertically equal to and can be correspondingly connected to the radial transition holes. The injection direction of the radial cutting jet holes is toward the center of the inner tube and tilted downward. Each group of vertical cutting jet holes includes three tapered holes that are thick at the top and thin at the bottom. The three tapered holes are spaced apart along the radial direction of the outer cylinder. The inner tapered hole is inclined inward from top to bottom, the outer tapered hole is inclined outward from top to bottom, and the middle tapered hole is vertically downward from top to bottom. The three-channel rotating shaft includes a rotating outer tube, a rotating middle tube and a rotating inner tube that are coaxial and arranged in sequence from the outside to the inside. A rotating radial rod is fixed between the inner circle of the rotating outer tube and the outer circle of the rotating middle tube, and between the inner circle of the rotating middle tube and the outer circle of the rotating inner tube. The outer circle of the rotating outer tube is rotatably connected to the mounting box through two first bearings arranged at intervals above and below. The lower end of the rotating outer tube is fixedly connected to the upper end face of the outer cylinder. The outer circle of the rotating outer tube and the upper end face of the outer cylinder are connected by several reinforcing plates. The top of the outer cylinder is provided with an external water hole corresponding to the inner hole of the rotating outer tube. The middle tube and the lower ends of the rotating inner tube are fixedly connected to the top of the inner cylinder through the external water hole. Three switching water injection horizontal tubes are arranged in a circular array along the center line of the rotating middle tube. The inner ports of the switching water injection horizontal tubes are all connected to the interior of the rotating middle tube. The outer ends of the switching water injection horizontal tubes are connected to switching water injection vertical tubes arranged along the annular cavity. A piston rod is slidingly provided inside the lower port of the switching water injection vertical tube. The lower end of the piston rod is provided with a wedge-shaped push block located below the lower port of the switching water injection vertical tube. A fixed wedge block that cooperates with the wedge surface of the wedge-shaped push block is fixed on the top of the annular injection tube. The disc cavity is provided with three clamping water injection horizontal pipes arranged in a circular array along the center line of the rotating middle tube. The inner port of the clamping water injection horizontal pipe passes through the rotating middle tube and is connected to the interior of the rotating inner tube. The outer end of the clamping water injection horizontal pipe is connected to the clamping water injection vertical pipe arranged along the annular cavity. The inner cylinder wall is provided with three expansion holes located in the annular cavity. The three expansion holes are evenly arranged along the circumferential direction of the inner cylinder. The outside of the inner cylinder is provided with a containment shell that seals the expansion holes and the annular cavity. A rubber bag is provided in the containment shell. The outer surface of the rubber bag is bonded to the containment shell. The interior of the rubber bag is flush with the inner circle of the inner cylinder. The lower end of each clamping water injection vertical pipe passes through a containment shell and is connected to the interior of the rubber bag. The three-channel coaxial sealing joint includes a fixed outer tube, a fixed middle tube and a fixed inner tube which are coaxial and arranged in sequence from the outside to the inside. A fixed radial rod is fixed between the inner circle of the fixed outer tube and the outer circle of the fixed middle tube, and between the inner circle of the fixed middle tube and the outer circle of the fixed inner tube. An outer sleeve is coaxially integrated with the lower end of the fixed outer tube, and an inner sleeve is coaxially integrated with the upper end of the rotating outer tube and inserted into the outer sleeve. The outer circle of the inner sleeve and the inner circle of the outer sleeve are rotatably connected through three second bearings. A second spring sleeved on the outer circle of the inner sleeve is provided between two adjacent second bearings. The diameters of the inner circle of the inner sleeve and the inner circle of the fixed outer tube are equal. There is a gap between the annular surface of the upper end of the inner sleeve and the annular surface of the lower end of the fixed outer tube, and between the annular surface of the upper end of the rotating middle tube and the annular surface of the lower end of the fixed middle tube. The contact surfaces between the annular surface of the upper end of the rotating inner tube and the annular surface of the lower end of the fixed inner tube are both conical surfaces with a thin inner side and a thick outer side. An upper flange is integrally provided on the outer circle of the lower end of the outer sleeve, and a pressure plate is integrally provided on the outer circle of the inner sleeve under the second bearing. A pressure ring is provided on the upper end of the pressure plate and is press-fitted with the lower end annular surface of the outer ring of the second bearing at the lower end. A lower flange is provided on the outer circle of the inner sleeve under the pressure plate. The lower flange and the upper flange are connected by a number of long bolts in a circumferential array. An adjusting nut is threadedly connected to the upper end of the long bolt. A third spring is sleeved on the long bolt. The upper and lower ends of the third spring are press-fitted with the adjusting nut and the upper flange respectively. An annular groove is provided between the upper surface of the lower flange and the lower surface of the pressure plate, and a number of balls are provided in the annular groove. A sealing ring is provided above the second bearing at the uppermost portion between the inner circle of the outer sleeve and the outer circle of the inner sleeve. An overflow hole is radially opened in the outer sleeve and is communicated with a conical surface that matches the upper end annular surface of the inner sleeve and the lower end annular surface of the fixed outer tube. An outer end of the overflow hole is connected to an overflow pipe, and the outer end of the overflow pipe extends outside the mounting box. The fixed outer tube and the fixed inner tube are respectively connected to the two interfaces of the two-position three-way solenoid valve through the high-pressure hose. The third interface of the two-position three-way solenoid valve is connected to the outlet of the jet cutting high-pressure water pump. The fixed middle tube is connected to the switching high-pressure water pump through the switching tube. The switching tube is provided with a switching solenoid valve and a pressure gauge. The pressure gauge is respectively controlled and connected to the switching solenoid valve, the switching high-pressure water pump and the two-position three-way solenoid valve through the PLC controller.

[0012] The multifunctional core sampling method for geophysical exploration is carried out using a multifunctional core sampling device for geophysical exploration, which includes two working modes: 1. Using a soft geological material sampler to perform core sampling of soil, riverbed, coal seam or other soft geological materials; 2. Using a hard geological material sampler to perform core sampling of rock, rock formation or other hard geological materials; Working mode 1 includes the following steps: 1) Open the box door and take out the soft geological material sampler; 2) Hold a pressing handle in each hand, start the hollow shaft motor, and drill the single-layer coring barrel into the soft geology toward the sampling position until the upper part of the single-layer coring barrel is about to enter the borehole, then turn off the hollow shaft motor to complete the sampling; 3) Take out the cylindrical soft sample from the soft geological material sampler; 4) Clean the single-layer coring barrel and place the soft geological material sampler into the box; Working mode 21 includes the following steps: S1. Open the box door and take out the hard geological material sampler; S2. Hold the operating handle and align the lower end of the double-layer coring barrel with the designated sampling position. Start the rotary drive motor and the jet cutting high-pressure water pump. The rotary drive motor drives the double-layer coring barrel to rotate. At the same time, the jet cutting high-pressure water pump draws clean water from the water tank and sprays high-pressure jet water through the vertical cutting jet hole at the lower end of the double-layer coring barrel. The high-pressure jet water performs jet cutting on hard materials. S3. When the upper portion of the double-layer coring barrel is about to enter the borehole, the high-pressure water pump is switched on and switched to extract clean water from the water tank, causing the annular jet tube to rotate within the annular cavity. The high-pressure water is switched to the radial cutting jet hole and ejected, thereby cutting off the cylindrical sample inside the inner barrel from the hard geological material body below. S4. Turn off the rotary drive motor, then switch the high-pressure water to the fixed inner tube through the two-position three-way solenoid valve, inject high-pressure water into the rubber bag, the rubber bag expands, and clamps the cylindrical sample inward through the expansion hole. Remove the double-layer coring barrel and the cylindrical sample from the borehole together. S5. Turn off the jet cutting high-pressure water pump, and the water in the rubber bag flows back, loosening the cylindrical sample, and then the cylindrical sample can be taken out from the double-layer coring barrel; S6. Clean the single-layer coring barrel and place the hard geological material sampler into the box.

[0013] Furthermore, the specific process of step 2) is as follows: holding a pressing handle in each hand, the hollow shaft motor is started, the hollow main shaft of the hollow shaft motor drives the drive shaft to rotate at high speed through the spline structure, and the single-layer coring barrel coaxially fixedly connected to the hollow main shaft also rotates at high speed, the diamond cutter heads in the circular array at the lower end of the single-layer coring barrel drill into the soft material, the drill cuttings are discharged outward through the spiral chip discharge shallow groove, and the soft material enters the single-layer coring barrel, completing the sampling. The single-layer coring barrel drills into the soft geology toward the sampling position until the upper part of the single-layer coring barrel is about to enter the borehole, and then the hollow shaft motor is turned off to complete the sampling; Step 3) The specific process is as follows: unscrew the positioning bolt, take out an extended push rod from the box, extend one end of the extended push rod into and screw into the push rod at the upper end of the internal threaded hole, then press the extended push rod downward to drive the push plate downward through the push rod, and the push plate pushes the cylindrical soft sample downward out of the single-layer coring barrel, then pull the reinforced push rod upward to make the push plate contact with the top of the single-layer coring barrel, and make the upper end of the push rod correspond to the positioning notch between the upper end of the push rod. At this time, the push plate corresponds to the threaded hole at the top of the single-layer coring barrel, screw the positioning bolt into the threaded hole at the top of the single-layer coring barrel to fix the push plate.

[0014] Furthermore, the specific process of step S2 is: holding the operating handle, aligning the lower end of the double-layer coring barrel with the designated sampling position, starting the rotary drive motor and the jet cutting high-pressure water pump, the rotary drive motor drives the rotating outer tube to rotate through the transmission mechanism, and the rotating middle tube and the rotating inner tube fixedly connected to the rotating outer tube also rotate synchronously, and the inner sleeve coaxial with the rotating outer tube rotates inside the outer sleeve, and the conical surface between the upper end ring surface of the inner sleeve and the lower end ring surface of the fixed outer tube forms a rotary sealing mating surface, and the conical surface between the upper end ring surface of the rotating middle tube and the lower end ring surface of the fixed middle tube forms a rotary sealing mating surface, and the upper end ring surface of the rotating inner tube and the fixed inner tube form a rotary sealing mating surface. The conical surface between the lower end annular surfaces forms a rotating sealing mating surface. The rotating outer tube, the rotating middle tube and the lower end of the rotating inner tube drive the outer tube and the inner tube to rotate at the same time. The jet cutting high-pressure water pump extracts clean water from the water tank. The pumping water pressure of the jet cutting high-pressure water pump increases slowly, and the high-pressure water is transported to the fixed outer annular channel between the fixed outer tube and the fixed middle tube through the two-position three-way solenoid valve, and then flows through the rotating outer annular channel, disc cavity, annular cavity, water inlet, annular jet pipe and axial transition hole between the rotating outer tube and the rotating middle tube in turn, and finally sprays downward through the vertical cutting jet hole inside the sealing ring to perform water cutting operations on hard materials.

[0015] Furthermore, the specific process of step S3 is: until the upper part of the double-layer core barrel is about to enter the borehole, start the switching high-pressure water pump, switch the high-pressure water pump to extract clean water in the water tank, and the high-pressure water enters the fixed inner annular channel between the fixed middle tube and the fixed inner tube through the switching solenoid valve, and then flows through the rotating inner annular channel between the rotating middle tube and the rotating inner tube, the switching water injection horizontal pipe and the switching water injection vertical pipe in turn. The high-pressure water drives the piston rod downward in the switching water injection vertical pipe, and the wedge-shaped push block at the lower end of the piston rod presses the fixed wedge block. Since the pressing surface of the wedge-shaped push block and the fixed wedge block is a wedge-shaped surface, the downward vertical thrust of the wedge-shaped push block is converted into a horizontal thrust to drive the fixed wedge block, and the horizontal thrust is The guide column overcomes the elastic force of the first spring, compresses the first spring, rotates the annular jet pipe, staggers the vertical cutting jet hole and the axial transition hole, and the vertical cutting jet hole no longer sprays high-pressure jet water. The water pressure grouting of the high-pressure water pump is increased. When the pressure gauge on the switching pipe reaches the set pressure, the radial transition hole on the inner wall of the annular jet pipe is correspondingly connected with the radial cutting jet hole. The pressure gauge transmits the signal to the PLC controller, and the PLC controller simultaneously sends a signal to control the solenoid valve and switch off the high-pressure water pump. The high-pressure water pumped by the jet cutting high-pressure water pump is sprayed out through the radial cutting jet hole, and the high-pressure jet water cuts off the cylindrical sample inside the inner tube from the hard geological material body below. The specific process of step S4 is as follows: the two-position three-way solenoid valve is switched to switch the passage, and the high-pressure water pumped by the jet cutting high-pressure water pump is delivered to the fixed inner tube, and then passes through the rotating inner tube, the clamping water injection horizontal tube, the clamping water injection vertical tube, and finally injected into the rubber bag. The rubber bag expands, and the inner walls of the three rubber bags clamp the outer circle of the cylindrical sample inward through the expansion hole. Finally, the operator removes the double-layer coring barrel and the cylindrical sample from the borehole together.

[0016] By adopting the above technical solution, compared with the existing technology, the present invention has the following beneficial effects: 1) This invention features a bracket mounted on top of the housing, on which a solar panel is mounted. The panel converts sunlight directly into electricity through the photovoltaic effect, which is then stored in a battery via a solar charge and discharge controller. Additionally, a solar panel can be mounted on the right or front side of the housing to increase the area available for solar energy absorption and improve solar energy utilization efficiency during field sampling. The battery is also equipped with a charging port.

[0017] 2) The present invention sets a soft geological material sampler and a hard geological material sampler in the box, both of which are handheld. Not only can drilling and sampling be carried out only where the wheels can reach, but the power lines and water pipes can be pulled to a place dozens of meters away from the box, thereby expanding the sampling range. At the same time, two instruments for sampling different geological materials are used. The soft geological material sampler is used for sampling soft materials, and the hard geological material sampler is used for sampling hard materials. The sampling is more extensive and more targeted.

[0018] 3) The soft geological material sampler utilizes a hollow-shaft motor. The drive shaft is coaxially mounted within the hollow main shaft and transmits torque via a spline mechanism. A compression nut and a locknut secure the drive shaft in place. Ribs not only strengthen the connection between the drive shaft and the single-layer coring barrel but also press-fit against the lower end of the hollow main shaft to axially locate the drive shaft. The hole wall of the drilled hole does not contact the outer circle of the single-layer coring barrel, which makes it convenient to pull out the single-layer coring barrel after coring; the inner circle rotation trajectory of all diamond bits is a conical surface with a small upper part and a large lower part, and the port diameter on the conical surface is equal to the inner diameter of the single-layer coring barrel. In this way, during the coring process, the soft material enters the single-layer coring barrel after being squeezed to a certain extent, which can create a certain friction between the cylindrical sample and the inner wall of the single-layer coring barrel. When the single-layer coring barrel is lifted up after the coring is completed, the cylindrical sample can be disconnected from the soft material outside at the lower port of the single-layer coring barrel by slightly shaking and pressing the handle. To remove a cylindrical sample from the single-layer coring barrel, remove the positioning bolts, connect the push rod with the extended push rod, and axially drive the push rod, ultimately causing the push plate to push the cylindrical sample out of the single-layer coring barrel. During drilling and sampling, the push plate is fixedly connected to the single-layer coring barrel with positioning bolts. To remove the cylindrical sample, remove the positioning bolts and drive the push plate to push it out. This is convenient and does not occupy the entire soft geological material sampler space. The positioning notch facilitates the insertion of the positioning bolts, saving operation time.

[0019] 4) The Hard Geological Material Sampler uses high-pressure water jet cutting to drill and sample hard geological materials. The jet cutting high-pressure water pump provides the power for the water jet cutting, while the switching high-pressure water pump provides the power to switch from axial to radial jet flow.

[0020] When performing axial drilling and cutting, the high-pressure water pump is switched off and the guide column is pressed to one end of the arc groove under the action of the first spring force. At this time, the vertical cutting jet hole in the sealing ring and the axial transition hole at the bottom of the circular injection tube are connected up and down, and the high-pressure jet water performs axial jet cutting through the vertical cutting jet hole; since each group of vertical cutting jet holes includes three conical holes with different inclination directions, the thickness of the annular groove cut by the ejected high-pressure jet water on the hard material is slightly larger than the overall wall thickness of the double-layer coring barrel, which facilitates the axial movement of the double-layer coring barrel. When the axial jet cutting is in place, the high-pressure water pump is switched on. The high-pressure water pump drives the piston rod in the water injection vertical pipe downward through high-pressure water. The wedge-shaped push block at the lower end of the piston rod drives the fixed wedge block and the annular injection pipe to rotate. The first spring is compressed, the vertical cutting jet hole and the axial transition hole are offset, and the high-pressure jet water is no longer sprayed axially. When the pressure gauge on the switching pipe reaches the set pressure, the radial transition holes on the inner wall of the annular injection pipe correspond to the radial cutting jet holes, and the high-pressure jet water is ejected through the radial cutting jet holes. The injection direction of the radial cutting jet holes is toward the bottom of the sealing ring. This way, the jet water will not be sprayed onto the inner barrel, avoiding damage to the inner barrel. During the axial jet cutting and radial jet cutting processes, the double-layer coring barrel keeps rotating slowly, ensuring that the material in the circumferential direction is evenly jet-cut. After radial cutting is completed, the outer diameter of the cylindrical sample is slightly smaller than the inner diameter of the inner cylinder. To remove the cylindrical sample from the inner cylinder, the two-position three-way solenoid valve is switched, and the high-pressure water flow from the jet cutting high-pressure water pump is switched to the rubber bladder. The rubber bladder expands, and the inner wall of the rubber bladder extends inward through the expansion hole to clamp the outer diameter of the cylindrical sample. This operation method ensures that a piece of cylindrical sample can be removed from the drilled hole conveniently and reliably.

[0021] 5) A coaxial rotary seal is adopted between the three-channel coaxial sealing joint and the three-channel rotating shaft. The inner sleeve is coaxially integrated with the upper end of the rotating outer tube, and the outer sleeve is coaxially integrated with the lower end of the fixed outer tube. The inner sleeve extends into and is rotatably connected to the inside of the outer sleeve through the third second bearing. A plurality of third springs arranged circumferentially between the inner sleeve and the outer sleeve press the adjusting nut, thereby pulling the long bolt, so that the long bolt pulls the lower flange. When the inner sleeve rotates, the pressure plate rotates accordingly. The setting of the ball reduces the friction between the pressure plate and the lower flange. The lower flange presses the pressure plate through the ball, thereby maintaining a good seal on the conical surface of the rolling connection between the upper end of the inner sleeve and the lower end of the fixed outer tube. At the same time, the conical surfaces of the rolling connection between the upper end of the rotating middle tube and the lower end of the fixed middle tube, and between the upper end of the rotating inner tube and the lower end of the fixed inner tube maintain a good seal. Compared with the annular surface, the conical surface has a larger sealing surface, a better sealing effect, and an axial pressure centering effect. Furthermore, during coring, the reverse thrust generated by the high-pressure water jet also creates an upward axial thrust on the rotating outer tube, further enhancing the sealing effect of the tapered surface. The second spring not only spaced the three third bearings, ensuring good coaxiality between the inner and outer sleeves, but also allows the second bearing to move axially during relative axial movement between the inner and outer sleeves, thus avoiding stress concentration.

[0022] During the process of switching from vertical cutting jet hole injection to radial cutting jet hole injection, and the process of the rubber bag being filled with water to expand and clamp the cylindrical sample, the rotating outer tube is no longer subjected to the reverse thrust of the axial jet water, and the jet cutting high-pressure water pump is always working, which will increase the water pressure in the pipeline. In order to avoid damage to the hard geological material sampler caused by high water pressure, the high water pressure compresses the first spring, and the distance between the upper flange and the lower flange increases. Therefore, an overflow hole is specially opened above the sealing ring, and the inner sleeve and the outer sleeve move axially relative to each other. A certain gap is generated on the conical surface between the upper end of the inner sleeve and the lower end of the fixed outer tube, and the high-pressure water flows out of the installation box through the overflow hole and the overflow pipe.

[0023] 6) The rotary drive motor and the rotating outer tube are connected via the transmission mechanism. The transmission mechanism includes a driving gear and a driven gear that are meshed with each other. The driving gear is mounted on the main shaft of the rotary drive motor. The inner circle of the driven gear is connected via a spline structure. In this way, when the rotating outer tube moves axially, the driven gear can move axially via the spline structure. In addition, a bearing seat for mounting two first bearings is provided in the mounting box. A small clearance fit is provided between the outer circle of the rotating outer tube and the inner circle of the first bearing. This also ensures that the rotating outer tube can be axially displaced. Since the cylindrical sample removed is used for testing and not for precision machining, the axial movement of the rotating outer tube does not affect the core drilling operation.

[0024] In summary, the present invention has a scientific principle and is easy to operate. A wheelbarrow is used as a carrier for a water tank, a battery, a jet cutting high-pressure water pump, and a switching high-pressure water pump to provide an energy source for a soft geological material sampler and a hard geological material sampler. Both the soft geological material sampler and the hard geological material sampler are handheld for operation, can perform sampling operations over a long distance, perform corresponding core sampling for different geological conditions, have a wide range of applications, and provide complete cylindrical samples for geophysical exploration operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention after removing the box door; Figure 3 yes Figure 1 A magnified image of the sampler for medium-soft geological materials; Figure 4 yes Figure 3 Schematic diagram of the internal structure of the soft geological material sampler after removing the hollow shaft motor; Figure 5 yes Figure 1 A magnified view of the sampler for medium-hard geological materials; Figure 6 yes Figure 5 Enlarged view of part A in the middle; Figure 7 yes Figure 5 Enlarged view of middle part B; Figure 8 yes Figure 7 Side view of the middle wedge push block and the fixed wedge block; Figure 9 This is a schematic diagram of the cross section between the annular injection pipe and the inner and outer cylinders when high-pressure jet water is used to perform axial jet cutting through the vertical cutting jet holes. In this case, the vertical cutting jet holes and the axial transition holes are connected to each other, and the radial transition holes are staggered with the radial cutting jet holes. Figure 10 This is a diagram showing the position of the guide column when high-pressure water jets are passing through vertical cutting jet holes for axial jet cutting; Figure 11 This is a schematic diagram of the cross section between the annular injection pipe and the inner and outer cylinders when high-pressure jet water is passing through the radial cutting jet holes for radial jet cutting. In this case, the vertical cutting jet holes are staggered from the axial transition holes, and the radial transition holes are correspondingly connected to the radial cutting jet holes. Figure 12 It is a schematic diagram of the guide column compressing the first spring when high-pressure jet water passes through the radial cutting jet hole to perform radial jet cutting; Figure 13 It is a schematic diagram of the cross section of the double-layer coring barrel at the rubber bag (expansion hole). DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples.

[0027] like Figures 1-13 As shown, the multifunctional core sampling device for geophysical exploration of the present invention comprises a frame 1, a box body 2 is provided on the frame 1, wheels 3 are provided at the bottom of the frame 1, a push frame 4 is fixedly provided at the upper rear side of the frame 1, a double-door 5 is provided on the left side of the box body 2, a bracket is provided on the top of the box body 2, a solar cell panel 6 is provided on the bracket, a soft geological material sampler 7, a hard geological material sampler 8, a water tank 9, a jet cutting high-pressure water pump 10, a switching high-pressure water pump 11, a battery 12 and a solar charge and discharge controller 13, and a solar cell. The panel 6 charges the battery 12 through the solar charge and discharge controller 13, and the battery 12 supplies power to the soft geological material sampler 7, the hard geological material sampler 8, the jet cutting high-pressure water pump 10 and the switching high-pressure water pump 11 respectively through the solar charge and discharge controller 13. The jet cutting high-pressure water pump 10 draws clean water from the water tank 9 to provide cutting jet water for the hard geological material sampler 8 during the sampling process. The switching high-pressure water pump 11 draws clean water from the water tank 9 to switch the hard geological material sampler 8 to perform vertical jet cutting or horizontal jet cutting.

[0028] The box body 2 is divided into a front upper chamber 14, a front lower chamber 15, a rear upper chamber 16 and a rear lower chamber 17 by horizontal partitions and vertical partitions. The high-pressure water pump and the hard geological material sampler 8 are arranged in the front upper chamber 14, the water tank 9 is arranged in the front lower chamber 15, the soft geological material sampler 7 is arranged in the rear upper chamber 16, the battery 12 and the solar charge and discharge controller 13 are arranged in the rear lower chamber 17, and the top of the box body 2 is provided with a first through hole 18 connecting the rear upper chamber 16 and the bottom of the solar panel 6 A second through-hole 19 is provided on the rear side of the horizontal partition, connecting the rear upper chamber 16 and the rear lower chamber 17. The solar panel 6 and the solar charge and discharge controller 13 are connected by a charging cable that passes through the first through-hole 18, the rear upper chamber 16, and the second through-hole 19 from top to bottom. A third through-hole 20 is provided on the front side of the horizontal partition, connecting the front upper chamber 14 and the front lower chamber 15 for passing water pipes and wires. A fourth through-hole 21 is provided on the lower part of the vertical partition, connecting the front lower chamber 15 and the rear lower chamber 17 for passing wires.

[0029] The soft geological material sampler 7 includes a hollow shaft motor 22 and a single-layer coring barrel 23. A pressing handle 24 is provided on the left and right sides of the outer shell of the hollow shaft motor 22. The main shaft of the hollow shaft motor 22 is a hollow main shaft 25 that is transparent from top to bottom. The inner hole of the hollow main shaft 25 is coaxially installed with a drive shaft 26 through a spline structure. The single-layer coring barrel 23 is a cylindrical structure with an open lower end. The lower end of the drive shaft 26 is coaxially fixedly connected to the upper end of the single-layer coring barrel 23. The outer circle of the lower part of the drive shaft 26 is fixedly connected to the upper end surface of the single-layer coring barrel 23 by at least three ribs 27 in a circumferential array. The upper end of the drive shaft 26 extends out of the upper end of the hollow main shaft 25. The outer circle of the upper end of the drive shaft 26 is provided with a detachable fastening component connected to the upper end of the hollow main shaft 25.

[0030] The detachable fastening assembly includes a compression nut 28 and a lock nut 29, both of which are threadedly connected to the outer circle of the upper end of the drive shaft 26. The lower end of the compression nut 28 is press-fitted to the upper end surface of the hollow main shaft 25. The lower end of the lock nut 29 is press-fitted to the upper end of the compression nut 28. The lower end surface of the hollow main shaft 25 is press-fitted to the upper ends of all the ribs 27. The annular surface at the lower end of the single-layer coring barrel 23 is provided with a plurality of mounting grooves along the circumference. A diamond bit 30 is installed and welded in each mounting groove. The maximum rotation diameter of all diamond bits 30 is greater than the outer diameter of the single-layer coring barrel 23. The inner circle rotation trajectory of all diamond bits 30 is a conical surface with a smaller top and a larger bottom. The diameter of the port on the conical surface is equal to the inner diameter of the single-layer coring barrel 23. The outer circle of the single-layer coring barrel 23 is provided with a shallow spiral chip removal groove 31. The driving shaft 26 is a round tube that is transparent from top to bottom. A center hole corresponding to the lower end of the driving shaft 26 is opened on the top of the single-layer coring barrel 23. A pushing rod 32 is provided in the driving shaft 26. The lower end of the pushing rod 32 passes through the center hole and is fixedly connected to a push plate 33 located in the single-layer coring barrel 23. The push plate 33 is connected to the top of the single-layer coring barrel 23 by at least two positioning bolts 34. The upper end of the pushing rod 32 is flush with the upper end of the driving shaft 26. A positioning notch 35 is provided between the upper end of the pushing rod 32 and the upper end of the pushing rod 32. An internal threaded hole 36 for connecting an extended push rod is provided in the center of the upper end of the driving shaft 26.

[0031] The hard geological material sampler 8 includes an installation box 37, a double-layer coring barrel, a rotary drive motor 38 and a three-channel coaxial sealed joint. Two operating handles 39 are symmetrically provided on the left and right sides of the installation box 37. The lower end of the double-layer coring barrel is open. The top of the double-layer coring barrel is coaxially fixedly connected to the three-channel rotating shaft. The upper part of the three-channel drive shaft 26 extends into and rotatably connected to the installation box 37. The rotary drive motor 38 is arranged in the installation box 37. The rotary drive motor 38 is connected to the three-channel rotating shaft through a transmission mechanism. The lower end of the three-channel coaxial sealed joint is arranged in the installation box 37 and is coaxially and coaxially transmitted with the upper end of the three-channel rotating shaft. There are two high-pressure water pumps, one high-pressure water pump is a switching high-pressure water pump 11, and the other high-pressure water pump is a jet cutting high-pressure water pump 10. The switching high-pressure water pump 11 is connected to one interface of the three-channel coaxial sealed joint through a switching tube 91, and the jet cutting high-pressure water pump 10 is connected to the other two interfaces of the three-channel coaxial seal through a two-position three-way solenoid valve 40 and two high-pressure hoses 41.

[0032] The double-layer coring barrel includes an inner barrel 42 and an outer barrel 43 arranged coaxially, an annular cavity 44 is formed between the outer circle of the inner barrel 42 and the inner circle of the outer barrel 43, a disc cavity 45 is formed between the upper surface of the top of the inner barrel 42 and the lower surface of the top of the outer barrel 43, a sealing ring 46 is provided at the lower end of the annular cavity 44, the lower end surface of the sealing ring 46, the lower end surface of the inner barrel 42 and the lower end surface of the outer barrel 43 are flush, an annular injection pipe 47 is provided on the top surface of the sealing ring 46 in the annular cavity 44, a plurality of water inlets 93 are provided on the top of the annular injection pipe 47, the inner circle of the annular injection pipe 47 is slidably sealed with the outer circle of the inner barrel 42, a plurality of groups of vertical cutting jet holes 48 that are uniformly provided in the circumferential direction of the sealing ring 46, and an axial transition hole 49 that is connected to each group of vertical cutting jet holes 48 is provided on the bottom surface of the annular injection pipe 47. At least three arc-shaped grooves 50 are evenly arranged in the direction. A guide column 51 extending into the arc-shaped groove 50 is fixed on the bottom surface of the annular injection tube 47. A first spring 52 is provided in the arc-shaped groove 50. The two ends of the first spring 52 are respectively pressed against one end of the arc-shaped groove 50 and the outer circle of the guide column 51. A plurality of radial transition holes 53 are evenly opened on the inner wall of the annular injection tube 47 along the circumferential direction. The radial cutting jet holes 54 that are vertically equal to the radial transition holes 53 and can be correspondingly connected are evenly opened on the wall of the inner tube 42 along the circumferential direction. The injection direction of the radial cutting jet hole 54 is toward the center of the inner tube 42 and tilted downward.

[0033] Each group of vertical cutting jet holes 48 includes three tapered holes that are thick at the top and thin at the bottom. The three tapered holes are arranged at intervals along the radial direction of the outer cylinder 43. The inner tapered hole is inclined inward from top to bottom, the outer tapered hole is inclined outward from top to bottom, and the middle tapered hole is vertically downward from top to bottom.

[0034] The three-channel rotating shaft includes a rotating outer tube 55, a rotating middle tube 56 and a rotating inner tube 57 which are coaxial and arranged in sequence from the outside to the inside. A rotating radial rod 58 is fixed between the inner circle of the rotating outer tube 55 and the outer circle of the rotating middle tube 56, and between the inner circle of the rotating middle tube 56 and the outer circle of the rotating inner tube 57. The outer circle of the rotating outer tube 55 is rotatably connected to the mounting box 37 through two first bearings 59 arranged at intervals above and below. The lower end of the rotating outer tube 55 is fixedly connected to the upper end face of the outer cylinder 43. The outer circle of the rotating outer tube 55 and the upper end face of the outer cylinder 43 are connected by several reinforcing plates 60. The top of the outer cylinder 43 is provided with an outer water hole corresponding to the inner hole of the rotating outer tube 55. The lower ends of the tube 56 and the rotating inner tube 57 are fixedly connected to the top of the inner cylinder 42 through the external water hole. Three switching water injection horizontal tubes 61 are arranged in a circular array along the center line of the rotating middle tube 56. The inner ports of the switching water injection horizontal tubes 61 are all connected to the interior of the rotating middle tube 56. The outer ends of the switching water injection horizontal tubes 61 are connected to the switching water injection vertical tubes 62 arranged along the annular cavity 44. A piston rod 94 is slidably provided inside the lower port of the switching water injection vertical tube 62. The lower end of the piston rod 94 is provided with a wedge-shaped push block 63 located below the lower port of the switching water injection vertical tube 62. A fixed wedge block 64 is fixed on the top of the annular injection tube 47 and matches the wedge surface of the wedge-shaped push block 63. The disc cavity 45 is provided with three clamping water injection horizontal pipes 65 arranged in a circular array along the center line of the rotating middle tube 56. The inner port of the clamping water injection horizontal pipe 65 passes through the rotating middle tube 56 and is connected to the interior of the rotating inner tube 57. The outer end of the clamping water injection horizontal pipe 65 is connected to the clamping water injection vertical pipe 66 arranged along the annular cavity 44. The wall of the inner cylinder 42 is provided with three expansion holes 67 located in the annular cavity 44. The three expansion holes 67 are evenly arranged along the circumferential direction of the inner cylinder 42. The outside of the inner cylinder 42 is provided with a accommodating shell 68 that seals the expansion holes 67 and the annular cavity 44. A rubber bag 69 is provided in the accommodating shell 68. The outer surface of the rubber bag 69 is bonded to the accommodating shell 68. The interior of the rubber bag 69 is flush with the inner circle of the inner cylinder 42. The lower end of each clamping water injection vertical pipe 66 passes through a accommodating shell 68 and is connected to the interior of the rubber bag 69. The three-channel coaxial sealing joint includes a fixed outer tube 70, a fixed middle tube 71 and a fixed inner tube 72 which are coaxial and arranged in sequence from the outside to the inside. A fixed radial rod 92 is fixed between the inner circle of the fixed outer tube 70 and the outer circle of the fixed middle tube 71, and between the inner circle of the fixed middle tube 71 and the outer circle of the fixed inner tube 72. An outer sleeve 73 is coaxially integrated with the lower end of the fixed outer tube 70. An inner sleeve 74 which extends into the outer sleeve 73 is coaxially integrated with the upper end of the rotating outer tube 55. The outer circle of the inner sleeve 74 and the inner circle of the outer sleeve 73 are rotatably connected by three second bearings 75. A second spring 76 which is sleeved on the outer circle of the inner sleeve 74 is provided between two adjacent second bearings 75. The diameters of the inner circle of the inner sleeve 74 and the inner circle of the fixed outer tube 70 are equal. Between the upper end annular surface of the inner sleeve 74 and the lower end annular surface of the fixed outer tube 70, between the upper end annular surface of the rotating middle tube 56 and the lower end annular surface of the fixed middle tube 71, The contact surfaces between the upper annular surface of the rotating inner tube 57 and the lower annular surface of the fixed inner tube 72 are both conical surfaces 77 with a thin inner surface and a thick outer surface. The outer circle of the lower end of the outer sleeve 73 is integrally provided with an upper flange 78. The outer circle of the inner sleeve 74 is integrally provided with a pressure plate 79 below the second bearing 75. The upper end of the pressure plate 79 is provided with a pressure ring 80 that is press-fitted with the lower end annular surface of the outer ring of the second bearing 75 at the lower end. The outer circle of the inner sleeve 74 is provided with a lower flange 81 below the pressure plate 79. The lower flange 81 and the upper flange 78 are connected by a plurality of long bolts 82 in a circumferential array. The upper end of the long bolt 82 is threadedly connected with an adjusting nut 83. A third spring 84 is sleeved on the long bolt 82. The upper and lower ends of the third spring 84 are press-fitted with the adjusting nut 83 and the upper flange 78 respectively. An annular groove is provided between the upper surface of the lower flange 81 and the lower surface of the pressure plate 79, and a plurality of balls 85 are provided in the annular groove. A sealing ring 86 is provided between the inner circumference of the outer sleeve 73 and the outer circumference of the inner sleeve 74 above the uppermost second bearing 75. An overflow hole 87 is radially opened in the outer sleeve 73 and communicates with a conical surface 77 that matches the upper annular surface of the inner sleeve 74 and the lower annular surface of the fixed outer tube 70. The outer end of the overflow hole 87 is connected to an overflow pipe 88, and the outer end of the overflow pipe 88 extends outside the mounting box 37. The fixed outer tube 70 and the fixed inner tube 72 are respectively connected to the two interfaces of the two-position three-way solenoid valve 40 through the high-pressure hose 41. The third interface of the two-position three-way solenoid valve 40 is connected to the outlet of the jet cutting high-pressure water pump 10. The fixed middle tube 71 is connected to the switching high-pressure water pump 11 through the switching tube 91. The switching tube 91 is provided with a switching solenoid valve 89 and a pressure gauge 90. The pressure gauge 90 is controlled and connected with the switching solenoid valve 89, the switching high-pressure water pump 11 and the two-position three-way solenoid valve 40 respectively through the PLC controller.

[0035] The multifunctional core sampling method for geophysical exploration is carried out using a multifunctional core sampling device for geophysical exploration, and includes two working modes: first, using a soft geological material sampler 7 to perform core sampling of soil, riverbed, coal seam or other soft geological materials; second, using a hard geological material sampler 8 to perform core sampling of rock, rock formation or other hard geological materials; Working mode 1 includes the following steps: 1) Open the box door 5 and take out the soft geological material sampler 7; 2) Hold a pressing handle 24 in each hand to start the hollow shaft motor 22, and the single-layer coring barrel 23 drills into the soft soil toward the sampling position until the upper part of the single-layer coring barrel 23 is about to enter the borehole, then turn off the hollow shaft motor 22 to complete the sampling; 3) Take out the cylindrical soft sample from the soft geological material sampler 7; 4) Clean the single-layer coring barrel 23 and place the soft geological material sampler 7 into the box 2; Working mode 21 includes the following steps: S1, open the box door 5 and take out the hard geological material sampler 8; S2. Hold the operating handle 39 and align the lower end of the double-layer coring barrel with the designated sampling position. Start the rotary drive motor 38 and the jet cutting high-pressure water pump 10. The rotary drive motor 38 drives the double-layer coring barrel to rotate. At the same time, the jet cutting high-pressure water pump 10 draws clean water from the water tank 9 and sprays high-pressure jet water through the vertical cutting jet hole 48 at the lower end of the double-layer coring barrel. The high-pressure jet water performs jet cutting on hard materials. S3. When the upper portion of the double-layer coring barrel is about to enter the borehole, the high-pressure water pump 11 is switched on and on to extract clean water from the water tank 9, causing the annular jet pipe 47 to rotate in the annular cavity 44. The high-pressure water is switched to the radial cutting jet hole 54 and ejected, thereby cutting off the cylindrical sample inside the inner barrel 42 from the hard geological material body below. S4. Turn off the rotary drive motor 38, then switch the high-pressure water to the fixed inner tube 72 through the two-position three-way solenoid valve 40, and inject high-pressure water into the rubber bag 69. The rubber bag 69 expands and clamps the cylindrical sample inward through the expansion hole 67. The double-layer coring barrel and the cylindrical sample are removed from the drill hole together. S5. Turn off the jet cutting high-pressure water pump 10, and the water in the rubber bag 69 flows back, loosening the cylindrical sample, and then the cylindrical sample can be taken out from the double-layer coring barrel; S6. Clean the single-layer coring barrel 23 and place the hard geological material sampler 8 into the box 2.

[0036] Step 2) The specific process is as follows: holding a pressing handle 24 in each hand, the hollow shaft motor 22 is started, and the hollow main shaft 25 of the hollow shaft motor 22 drives the drive shaft 26 to rotate at high speed through a spline structure. The single-layer coring barrel 23 coaxially fixedly connected to the hollow main shaft 25 also rotates at high speed. The diamond cutter heads 30 in the circular array at the lower end of the single-layer coring barrel 23 drill into the soft material, and the drill cuttings are discharged outward through the spiral chip discharge shallow groove 31. The soft material enters the single-layer coring barrel 23, and the sampling is completed. The single-layer coring barrel 23 drills into the soft geology toward the sampling position until the upper part of the single-layer coring barrel 23 is about to enter the borehole, and then the hollow shaft motor 22 is turned off to complete the sampling; Step 3) The specific process is: unscrew the positioning bolt 34, take out an extended push rod from the box body 2, extend one end of the extended push rod into and screw into the pushing rod 32 at the upper end of the internal threaded hole 36, then press the extended push rod downward, and drive the pushing plate 33 to move downward through the pushing rod 32. The pushing plate 33 pushes the cylindrical soft sample downward out of the single-layer coring barrel 23, and then pull the reinforced push rod upward to make the pushing plate 33 contact with the top of the single-layer coring barrel 23, and make the upper end of the pushing rod 32 correspond to the positioning notch 35 between the upper end of the pushing rod 32. At this time, the pushing plate 33 corresponds to the threaded hole at the top of the single-layer coring barrel 23, and screw the positioning bolt 34 into the threaded hole at the top of the single-layer coring barrel 23 to fix the pushing plate 33.

[0037] The specific process of step S2 is as follows: hold the operating handle 39, align the lower end of the double-layer coring barrel with the designated sampling position, start the rotary drive motor 38 and the jet cutting high-pressure water pump 10, and the rotary drive motor 38 drives the rotating outer tube 55 to rotate through the transmission mechanism, and the rotating middle tube 56 and the rotating inner tube 57 fixedly connected to the rotating outer tube 55 also rotate synchronously, and the inner sleeve 74 coaxial with the rotating outer tube 55 rotates inside the outer sleeve 73, and the conical surface 77 between the upper end ring surface of the inner sleeve 74 and the lower end ring surface of the fixed outer tube 70 forms a rotary sealing mating surface, and the conical surface 77 between the upper end ring surface of the rotating middle tube 56 and the lower end ring surface of the fixed middle tube 71 forms a rotary sealing mating surface, and the upper end ring surface of the rotating inner tube 57 and the lower end ring surface of the fixed inner tube 72 form a rotary sealing mating surface. The conical surface 77 between the surfaces forms a rotating sealing mating surface, and the rotating outer tube 55, the rotating middle tube 56 and the lower end of the rotating inner tube 57 drive the outer cylinder 43 and the inner cylinder 42 to rotate at the same time, and the jet cutting high-pressure water pump 10 extracts clean water from the water tank 9. The pumping water pressure of the jet cutting high-pressure water pump 10 increases slowly, and the high-pressure water is transported to the fixed outer annular channel between the fixed outer tube 70 and the fixed middle tube 71 through the two-position three-way solenoid valve 40, and then flows through the rotating outer annular channel between the rotating outer tube 55 and the rotating middle tube 56, the disc cavity 45, the annular cavity 44, the water inlet 93, the annular jet pipe and the axial transition hole 49 in turn, and finally sprays downward through the vertical cutting jet hole 48 inside the sealing ring 46 to perform water cutting operations on hard materials.

[0038] The specific process of step S3 is: until the upper part of the double-layer core barrel is about to enter the borehole, start the switching high-pressure water pump 11, switch the high-pressure water pump 11 to extract the clean water in the water tank 9, and the high-pressure water enters the fixed inner annular channel between the fixed middle tube 71 and the fixed inner tube 72 through the switching solenoid valve 89, and then flows through the rotating inner annular channel between the rotating middle tube 56 and the rotating inner tube 57, the switching water injection horizontal pipe 61 and the switching water injection vertical pipe 62. The high-pressure water drives the piston rod 94 downward in the switching water injection vertical pipe 62, and the wedge-shaped push block 63 at the lower end of the piston rod 94 presses the fixed wedge block 64. Since the pressing surface of the wedge-shaped push block 63 and the fixed wedge block 64 is a wedge-shaped surface, the downward vertical thrust of the wedge-shaped push block 63 is converted into a horizontal thrust for driving the fixed wedge block 64, and the horizontal thrust is guided by the guide The column 51 overcomes the elastic force of the first spring 52, compresses the first spring 52, and the annular jet tube 47 rotates. The vertical cutting jet hole 48 is staggered with the axial transition hole 49, and the vertical cutting jet hole 48 no longer sprays high-pressure jet water. The water pumping pressure of the high-pressure water pump 11 is switched to increase the grouting. When the pressure gauge 90 on the switching tube 91 reaches the set pressure, the radial transition hole 53 on the inner wall of the annular jet tube 47 is correspondingly connected with the radial cutting jet hole 54. The pressure gauge 90 transmits the signal to the PLC controller, and the PLC controller simultaneously sends a signal to control the solenoid valve and switch the high-pressure water pump 11 to close. The high-pressure water pumped by the jet cutting high-pressure water pump 10 is sprayed out through the radial cutting jet hole 54, and the high-pressure jet water cuts off the cylindrical sample inside the inner tube 42 from the hard geological material body below. The specific process of step S4 is: the two-position three-way solenoid valve 40 switches the passage, and the high-pressure water pumped by the jet cutting high-pressure water pump 10 is delivered to the fixed inner tube 72, and then passes through the rotating inner tube 57, the clamping water injection horizontal tube 65, the clamping water injection vertical tube 66, and finally injected into the rubber bag 69. The rubber bag 69 expands, and the inner walls of the three rubber bags 69 clamp the outer circle of the cylindrical sample through the expansion hole 67 inward. Finally, the operator takes out the double-layer coring barrel and the cylindrical sample from the borehole together.

[0039] The above embodiments illustrate the basic principles and features of the present invention, but the above only illustrates preferred embodiments of the present invention and is not limited to the embodiments. Under the guidance of this patent, those skilled in the art can make many variations and improvements without departing from the scope of the present invention and the scope of protection of the claims, all of which fall within the scope of protection of the present invention. Therefore, the patent and protection scope of the present invention shall be based on the appended claims.

Claims

1. A multifunctional core sampling device for geophysical exploration, comprising a frame, a box body provided on the frame, wheels provided at the bottom of the frame, a push frame fixedly provided at the upper rear portion of the frame, and a door provided on the left side of the box body, characterized in that: A solar panel is provided on the top of the box, and a soft geological material sampler, a hard geological material sampler, a water tank, a jet cutting high-pressure water pump, a switching high-pressure water pump, a battery and a solar charge and discharge controller are provided inside the box. The solar panel charges the battery through the solar charge and discharge controller, and the battery supplies power to the soft geological material sampler, the hard geological material sampler, the jet cutting high-pressure water pump and the switching high-pressure water pump respectively through the solar charge and discharge controller. The jet cutting high-pressure water pump draws clean water from the water tank to provide cutting jet water for the hard geological material sampler during the sampling process. The switching high-pressure water pump draws clean water from the water tank to switch the hard geological material sampler to perform vertical jet cutting or horizontal jet cutting.

2. The multifunctional core sampling device for geophysical exploration according to claim 1, characterized in that: The box body is divided into a front upper chamber, a front lower chamber, a rear upper chamber and a rear lower chamber by horizontal partitions and vertical partitions. The high-pressure water pump and a hard geological material sampler are arranged in the front upper chamber, the water tank is arranged in the front lower chamber, the soft geological material sampler is arranged in the rear upper chamber, the battery and the solar charge and discharge controller are arranged in the rear lower chamber, and a first through-hole connecting the rear upper chamber and the bottom of the solar cell panel is provided on the top of the box body. A second through-hole connecting the rear upper chamber and the rear lower chamber is provided on the rear side of the horizontal partition. The solar panel and the solar charge and discharge controller are connected by a charging cable that passes through the first through-hole, the rear upper chamber and the second through-hole from top to bottom in sequence. A third through-hole connecting the front upper chamber and the front lower chamber is provided on the front side of the horizontal partition for passing water pipes and electric wires. A fourth through-hole connecting the front lower chamber and the rear lower chamber is provided on the lower part of the vertical partition for passing electric wires.

3. The multifunctional core sampling device for geophysical exploration according to claim 1, characterized in that: The soft geological material sampler includes a hollow shaft motor and a single-layer coring barrel. A pressing handle is provided on the left and right sides of the outer shell of the hollow shaft motor respectively. The main shaft of the hollow shaft motor is a hollow main shaft that is transparent from top to bottom. The inner hole of the hollow main shaft is coaxially installed with a drive shaft through a spline structure. The single-layer coring barrel is a cylindrical structure with an open lower end. The lower end of the drive shaft is coaxially fixedly connected to the upper end of the single-layer coring barrel. The lower outer circle of the drive shaft and the upper end face of the single-layer coring barrel are fixedly connected by at least three ribs in a circumferential array. The upper end of the drive shaft extends out of the upper end of the hollow main shaft, and the outer circle of the upper end of the drive shaft is provided with a detachable fastening component connected to the upper end of the hollow main shaft.

4. The multifunctional core sampling device for geophysical exploration according to claim 3, characterized in that: The detachable fastening assembly includes a compression nut and a lock nut both of which are threadedly connected to the outer circle of the upper end of the drive shaft, the lower end of the compression nut is press-fitted to the upper end surface of the hollow main shaft, the lower end of the lock nut is press-fitted to the upper end of the compression nut, and the lower end surface of the hollow main shaft is press-fitted to the upper ends of all the ribs; The annular surface at the lower end of the single-layer coring barrel is provided with a plurality of mounting grooves along the circumference. A diamond cutter head is installed and welded in each mounting groove. The maximum rotation diameter of all diamond cutter heads is larger than the outer diameter of the single-layer coring barrel. The inner circle rotation trajectory of all diamond cutter heads is a conical surface with a smaller top and a larger bottom. The port diameter on the conical surface is equal to the inner diameter of the single-layer coring barrel. The outer circle of the single-layer coring barrel is provided with a shallow spiral chip removal groove. The driving shaft is a round tube that is transparent from top to bottom. A center hole corresponding to the lower end of the driving shaft is opened on the top of the single-layer coring barrel. A pushing rod is provided in the driving shaft. The lower end of the pushing rod passes through the center hole and is fixedly connected to a push plate located in the single-layer coring barrel. The push plate is connected to the top of the single-layer coring barrel by at least two positioning bolts. The upper end of the pushing rod is flush with the upper end of the driving shaft. A positioning notch is provided between the upper end of the pushing rod and the upper end of the pushing rod. An internal threaded hole for connecting an extended push rod is provided in the center of the upper end of the driving shaft.

5. The multifunctional core sampling device for geophysical exploration according to claim 2, characterized in that: The hard geological material sampler includes an installation box, a double-layer coring barrel, a rotary drive motor and a three-channel coaxial sealing joint. Two operating handles are symmetrically arranged on the left and right sides of the installation box. The lower end of the double-layer coring barrel is open. The top of the double-layer coring barrel is coaxially fixedly connected to the three-channel rotating shaft. The upper part of the three-channel drive shaft extends into and is rotatably connected in the installation box. The rotary drive motor is arranged in the installation box. The rotary drive motor is connected to the three-channel rotating shaft through a transmission mechanism. The lower end of the three-channel coaxial sealing joint is arranged in the installation box and is coaxially connected to the rotary seal at the upper end of the three-channel rotating shaft. There are two high-pressure water pumps, one high-pressure water pump is a switching high-pressure water pump, and the other high-pressure water pump is a jet cutting high-pressure water pump. The switching high-pressure water pump is connected to an interface of the three-channel coaxial sealing joint through a switching tube, and the jet cutting high-pressure water pump is connected to the other two interfaces of the three-channel coaxial seal through a two-position three-way solenoid valve and a high-pressure hose.

6. The multifunctional core sampling device for geophysical exploration according to claim 5, characterized in that: The double-layer coring barrel includes an inner barrel and an outer barrel arranged coaxially, an annular cavity is formed between the outer circle of the inner barrel and the inner circle of the outer barrel, a disc cavity is formed between the upper surface of the inner barrel top and the lower surface of the outer barrel top, a sealing ring is provided at the lower end of the annular cavity, the lower end face of the sealing ring, the lower end face of the inner barrel and the lower end face of the outer barrel are flush, an annular injection pipe is provided on the top surface of the sealing ring in the annular cavity, a plurality of water inlets are provided on the top of the annular injection pipe, the inner circle of the annular injection pipe is slidably sealed with the outer circle of the inner barrel, a plurality of groups of vertical cutting jet holes are uniformly provided in the sealing ring along the circumferential direction, and an axial transition hole corresponding to each group of vertical cutting jet holes is provided on the bottom surface of the annular injection pipe, and a plurality of water inlets are provided on the top of the annular injection pipe. At least three arc-shaped grooves are evenly arranged. A guide column extending into the arc-shaped groove is fixedly arranged on the bottom surface of the annular injection tube. A first spring is arranged in the arc-shaped groove. The two ends of the first spring are respectively press-fitted with one end of the arc-shaped groove and the outer circle of the guide column. A plurality of radial transition holes are evenly opened on the inner wall of the annular injection tube along the circumferential direction. The inner wall of the inner tube is evenly opened along the circumferential direction with radial cutting jet holes that are vertically equal to and can be correspondingly connected to the radial transition holes. The injection direction of the radial cutting jet holes is toward the center of the inner tube and tilted downward. Each group of vertical cutting jet holes includes three tapered holes that are thick at the top and thin at the bottom. The three tapered holes are spaced apart along the radial direction of the outer cylinder. The inner tapered hole is inclined inward from top to bottom, the outer tapered hole is inclined outward from top to bottom, and the middle tapered hole is vertically downward from top to bottom. The three-channel rotating shaft includes a rotating outer tube, a rotating middle tube and a rotating inner tube that are coaxial and arranged in sequence from the outside to the inside. A rotating radial rod is fixed between the inner circle of the rotating outer tube and the outer circle of the rotating middle tube, and between the inner circle of the rotating middle tube and the outer circle of the rotating inner tube. The outer circle of the rotating outer tube is rotatably connected to the mounting box through two first bearings arranged at intervals above and below. The lower end of the rotating outer tube is fixedly connected to the upper end face of the outer cylinder. The outer circle of the rotating outer tube and the upper end face of the outer cylinder are connected by several reinforcing plates. The top of the outer cylinder is provided with an external water hole corresponding to the inner hole of the rotating outer tube. The middle tube and the lower ends of the rotating inner tube are fixedly connected to the top of the inner cylinder through the external water hole. Three switching water injection horizontal tubes are arranged in a circular array along the center line of the rotating middle tube. The inner ports of the switching water injection horizontal tubes are all connected to the interior of the rotating middle tube. The outer ends of the switching water injection horizontal tubes are connected to switching water injection vertical tubes arranged along the annular cavity. A piston rod is slidingly provided inside the lower port of the switching water injection vertical tube. The lower end of the piston rod is provided with a wedge-shaped push block located below the lower port of the switching water injection vertical tube. A fixed wedge block that cooperates with the wedge surface of the wedge-shaped push block is fixed on the top of the annular injection tube. The disc cavity is provided with three clamping water injection horizontal pipes arranged in a circular array along the center line of the rotating middle tube. The inner port of the clamping water injection horizontal pipe passes through the rotating middle tube and is connected to the interior of the rotating inner tube. The outer end of the clamping water injection horizontal pipe is connected to the clamping water injection vertical pipe arranged along the annular cavity. The inner cylinder wall is provided with three expansion holes located in the annular cavity. The three expansion holes are evenly arranged along the circumferential direction of the inner cylinder. The outside of the inner cylinder is provided with a containment shell that seals the expansion holes and the annular cavity. A rubber bag is provided in the containment shell. The outer surface of the rubber bag is bonded to the containment shell. The interior of the rubber bag is flush with the inner circle of the inner cylinder. The lower end of each clamping water injection vertical pipe passes through a containment shell and is connected to the interior of the rubber bag. The three-channel coaxial sealing joint includes a fixed outer tube, a fixed middle tube and a fixed inner tube which are coaxial and arranged in sequence from the outside to the inside. A fixed radial rod is fixed between the inner circle of the fixed outer tube and the outer circle of the fixed middle tube, and between the inner circle of the fixed middle tube and the outer circle of the fixed inner tube. An outer sleeve is coaxially integrated with the lower end of the fixed outer tube, and an inner sleeve is coaxially integrated with the upper end of the rotating outer tube and inserted into the outer sleeve. The outer circle of the inner sleeve and the inner circle of the outer sleeve are rotatably connected through three second bearings. A second spring sleeved on the outer circle of the inner sleeve is provided between two adjacent second bearings. The diameters of the inner circle of the inner sleeve and the inner circle of the fixed outer tube are equal. There is a gap between the annular surface of the upper end of the inner sleeve and the annular surface of the lower end of the fixed outer tube, and between the annular surface of the upper end of the rotating middle tube and the annular surface of the lower end of the fixed middle tube. The contact surfaces between the annular surface of the upper end of the rotating inner tube and the annular surface of the lower end of the fixed inner tube are both conical surfaces with a thin inner side and a thick outer side. An upper flange is integrally provided on the outer circle of the lower end of the outer sleeve, and a pressure plate is integrally provided on the outer circle of the inner sleeve under the second bearing. A pressure ring is provided on the upper end of the pressure plate and is press-fitted with the lower end annular surface of the outer ring of the second bearing at the lower end. A lower flange is provided on the outer circle of the inner sleeve under the pressure plate. The lower flange and the upper flange are connected by a number of long bolts in a circumferential array. An adjusting nut is threadedly connected to the upper end of the long bolt. A third spring is sleeved on the long bolt. The upper and lower ends of the third spring are press-fitted with the adjusting nut and the upper flange respectively. An annular groove is provided between the upper surface of the lower flange and the lower surface of the pressure plate, and a number of balls are provided in the annular groove. A sealing ring is provided above the second bearing at the uppermost portion between the inner circle of the outer sleeve and the outer circle of the inner sleeve. An overflow hole is radially opened in the outer sleeve and is communicated with a conical surface that matches the upper end annular surface of the inner sleeve and the lower end annular surface of the fixed outer tube. An outer end of the overflow hole is connected to an overflow pipe, and the outer end of the overflow pipe extends outside the mounting box. The fixed outer tube and the fixed inner tube are respectively connected to the two interfaces of the two-position three-way solenoid valve through the high-pressure hose. The third interface of the two-position three-way solenoid valve is connected to the outlet of the jet cutting high-pressure water pump. The fixed middle tube is connected to the switching high-pressure water pump through the switching tube. The switching tube is provided with a switching solenoid valve and a pressure gauge. The pressure gauge is respectively controlled and connected to the switching solenoid valve, the switching high-pressure water pump and the two-position three-way solenoid valve through the PLC controller.

7. A multifunctional core sampling method for geophysical exploration, performed using the multifunctional core sampling device for geophysical exploration according to claim 4 or 6, characterized in that: It includes two working modes:

1. Use the soft geological material sampler to drill core samples of soil, riverbed, coal seam or other soft geological materials; 2. Use the hard geological material sampler to drill core samples of rock, rock layer or other hard geological materials; Working mode 1 includes the following steps: 1) Open the box door and take out the soft geological material sampler; 2) Hold a pressing handle in each hand, start the hollow shaft motor, and drill the single-layer coring barrel into the soft geology toward the sampling position until the upper part of the single-layer coring barrel is about to enter the borehole, then turn off the hollow shaft motor to complete the sampling; 3) Take out the cylindrical soft sample from the soft geological material sampler; 4) Clean the single-layer coring barrel and place the soft geological material sampler into the box; Working mode 21 includes the following steps: S1. Open the box door and take out the hard geological material sampler; S2. Hold the operating handle and align the lower end of the double-layer coring barrel with the designated sampling position. Start the rotary drive motor and the jet cutting high-pressure water pump. The rotary drive motor drives the double-layer coring barrel to rotate. At the same time, the jet cutting high-pressure water pump draws clean water from the water tank and sprays high-pressure jet water through the vertical cutting jet hole at the lower end of the double-layer coring barrel. The high-pressure jet water performs jet cutting on hard materials. S3. When the upper portion of the double-layer coring barrel is about to enter the borehole, the high-pressure water pump is switched on and switched to extract clean water from the water tank, causing the annular jet tube to rotate within the annular cavity. The high-pressure water is switched to the radial cutting jet hole and ejected, thereby cutting off the cylindrical sample inside the inner barrel from the hard geological material body below. S4. Turn off the rotary drive motor, then switch the high-pressure water to the fixed inner tube through the two-position three-way solenoid valve, inject high-pressure water into the rubber bag, the rubber bag expands, and clamps the cylindrical sample inward through the expansion hole. Remove the double-layer coring barrel and the cylindrical sample from the borehole together. S5. Turn off the jet cutting high-pressure water pump, and the water in the rubber bag flows back, loosening the cylindrical sample, and then the cylindrical sample can be taken out from the double-layer coring barrel; S6. Clean the single-layer coring barrel and place the hard geological material sampler into the box.

8. The multifunctional core sampling device and method for geophysical exploration according to claim 7, characterized in that: Step 2) The specific process is as follows: holding a pressing handle in each hand, the hollow shaft motor is started. The hollow main shaft of the hollow shaft motor drives the drive shaft to rotate at high speed through a spline structure. The single-layer coring barrel coaxially fixedly connected to the hollow main shaft also rotates at high speed. The diamond cutter heads in the circular array at the lower end of the single-layer coring barrel drill into the soft material. The drill cuttings are discharged outward through the spiral chip removal shallow groove. The soft material enters the single-layer coring barrel, completing the sampling. The single-layer coring barrel drills into the soft geology toward the sampling position until the upper part of the single-layer coring barrel is about to enter the borehole. The hollow shaft motor is then turned off, completing the sampling. Step 3) The specific process is as follows: unscrew the positioning bolt, take out an extended push rod from the box, extend one end of the extended push rod into and screw into the push rod at the upper end of the internal threaded hole, then press the extended push rod downward to drive the push plate downward through the push rod, and the push plate pushes the cylindrical soft sample downward out of the single-layer coring barrel, then pull the reinforced push rod upward to make the push plate contact with the top of the single-layer coring barrel, and make the upper end of the push rod correspond to the positioning notch between the upper end of the push rod. At this time, the push plate corresponds to the threaded hole at the top of the single-layer coring barrel, screw the positioning bolt into the threaded hole at the top of the single-layer coring barrel to fix the push plate.

9. The multifunctional core sampling method for geophysical exploration according to claim 8, characterized in that: The specific process of step S2 is as follows: hold the operating handle, align the lower end of the double-layer coring barrel with the designated sampling position, start the rotary drive motor and the jet cutting high-pressure water pump, and the rotary drive motor drives the rotating outer tube to rotate through the transmission mechanism. The rotating middle tube and the rotating inner tube fixedly connected to the rotating outer tube also rotate synchronously, and the inner sleeve coaxially integrated with the rotating outer tube rotates inside the outer sleeve, and the conical surface between the upper end ring surface of the inner sleeve and the lower end ring surface of the fixed outer tube forms a rotary sealing mating surface, and the conical surface between the upper end ring surface of the rotating middle tube and the lower end ring surface of the fixed middle tube forms a rotary sealing mating surface, and the upper end ring surface of the rotating inner tube and the lower end ring surface of the fixed inner tube form a rotary sealing mating surface. The conical surface between the annular surfaces forms a rotating sealing mating surface. The rotating outer tube, the rotating middle tube and the lower end of the rotating inner tube drive the outer tube and the inner tube to rotate at the same time. The jet cutting high-pressure water pump extracts clean water from the water tank. The pumping water pressure of the jet cutting high-pressure water pump increases slowly, and the high-pressure water is transported to the fixed outer annular channel between the fixed outer tube and the fixed middle tube through the two-position three-way solenoid valve. Then, it flows through the rotating outer annular channel, disc cavity, annular cavity, water inlet, annular jet pipe and axial transition hole between the rotating outer tube and the rotating middle tube in turn, and finally sprays downward through the vertical cutting jet hole inside the sealing ring to perform water cutting operations on hard materials.

10. The multifunctional core sampling device and method for geophysical exploration according to claim 9, characterized in that: The specific process of step S3 is: until the upper part of the double-layer core barrel is about to enter the borehole, start the switching high-pressure water pump, switch the high-pressure water pump to extract the clean water in the water tank, and the high-pressure water enters the fixed inner annular channel between the fixed middle tube and the fixed inner tube through the switching solenoid valve, and then flows through the rotating inner annular channel between the rotating middle tube and the rotating inner tube, the switching water injection horizontal pipe and the switching water injection vertical pipe in turn. The high-pressure water drives the piston rod downward in the switching water injection vertical pipe, and the wedge-shaped push block at the lower end of the piston rod presses the fixed wedge block. Since the pressing surface of the wedge-shaped push block and the fixed wedge block is a wedge surface, the downward vertical thrust of the wedge-shaped push block is converted into a horizontal thrust for driving the fixed wedge block, and the horizontal thrust is guided by the guide The column overcomes the elastic force of the first spring, compresses the first spring, rotates the annular jet pipe, staggers the vertical cutting jet hole and the axial transition hole, and the vertical cutting jet hole no longer sprays high-pressure jet water. The water pressure of the switching high-pressure water pump increases. When the pressure gauge on the switching pipe reaches the set pressure, the radial transition hole on the inner wall of the annular jet pipe is correspondingly connected with the radial cutting jet hole. The pressure gauge transmits the signal to the PLC controller, and the PLC controller simultaneously sends a signal to control the solenoid valve and switch off the high-pressure water pump. The high-pressure water pumped by the jet cutting high-pressure water pump is sprayed out through the radial cutting jet hole, and the high-pressure jet water cuts off the cylindrical sample inside the inner tube from the hard geological material body below. The specific process of step S4 is as follows: the two-position three-way solenoid valve is switched to switch the passage, and the high-pressure water pumped by the jet cutting high-pressure water pump is delivered to the fixed inner tube, and then passes through the rotating inner tube, the clamping water injection horizontal tube, the clamping water injection vertical tube, and finally injected into the rubber bag. The rubber bag expands, and the inner walls of the three rubber bags clamp the outer circle of the cylindrical sample inward through the expansion hole. Finally, the operator removes the double-layer coring barrel and the cylindrical sample from the borehole together.

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