A bidirectional sampling device and sampling method for geological exploration based on pit exploration

Abstract

The present invention discloses a bidirectional sampling device and sampling method for geological exploration based on pit exploration, including a mounting frame with a movable seat at the bottom, a main shaft system, a secondary shaft drilling system and a hydraulic propulsion system installed on the mounting frame, and the main shaft system and the secondary shaft drilling system are connected by a magnetic coupler, the main shaft system drives the secondary shaft drilling system to rotate through the magnetic coupler, and the hydraulic propulsion system pushes the secondary shaft drilling system to move horizontally, so that the secondary shaft drilling system performs sampling operations. The bidirectional sampling device for geological exploration based on pit exploration can sample on one side or both sides at the same time, and has high sampling efficiency. When sampling, the entire device can be stabilized by the sampling tubes on both sides, which can save manpower, and can avoid equipment damage caused by excessive load, reduce maintenance costs, and can also compare the hardness of rocks on both sides through the main shaft system, with high working efficiency, simple operation and convenient use.

Description

Technical Field

[0001] The invention relates to the technical field of geological prospecting equipment, in particular to a two-way sampling device and a sampling method for geological prospecting based on pit exploration. Background Art

[0002] Pit exploration, also known as tunneling or shaft engineering, plays an important role in geotechnical engineering exploration. Compared with traditional drilling engineering, the main advantage of pit exploration is that surveyors can directly observe the geological structure, ensure the accuracy and reliability of the data, and facilitate geological sketching. In addition, pit exploration can obtain undisturbed rock and soil samples without restriction, which is suitable for large-scale in-situ testing, especially in studying the spatial distribution and engineering properties of fault fracture zones, weak mud interlayers and sliding surfaces (zones), which plays an irreplaceable role.

[0003] However, due to the size limitations of the exploration pits and shafts, it is not possible to use large drilling rigs or drilling vehicles to directly take samples. The sampling operations of pit exploration projects also have the following problems in actual operations:

[0004] 1. When using a handheld core drill to take samples, the hard connection between the core drill's drive components and the drill rod is prone to getting stuck during the sampling process. Especially under complex geological conditions, when the drill rod is stuck and cannot rotate, it will also cause the drive components to be overloaded and damaged, which not only reduces work efficiency but also increases maintenance costs;

[0005] 2. Existing small coring machines generally adopt a unidirectional, single-point sampling method, and they need to be stabilized during sampling to prevent the reaction force of the rock formation from causing the equipment to tip over and prevent normal sampling; they cannot achieve the effect of bidirectional sampling without an additional fixed structure. At present, although there are multi-point sampling devices, for example, application number CN219608447U discloses a multi-point sampling device for geological surveys, the device adopts a unidirectional, multi-point sampling method, and samples soft soil layers, and still cannot achieve the effect of bidirectional sampling without an additional fixed structure;

[0006] 3. In addition, when an exploration pit or a shaft passes through a fault, a fracture zone or a weak interlayer, in order to determine the nature of the fault (such as a normal fault, a reverse fault or a strike-slip fault) and the width and influence range of the fracture zone, it is necessary to compare the hardness of the rocks on both sides. In the prior art, when comparing the hardness of the rocks on both sides of an exploration pit or a shaft, a commonly used method is to use a special hardness detection method to detect and compare the hardness of the rocks on both sides, such as a rebound hammer method, an ultrasonic method and a streaking method. However, the above methods all require special equipment for detection, and it is impossible to directly compare the hardness of the rocks on both sides during the sampling process, which increases the workload and reduces work efficiency.

[0007] Therefore, the present invention provides a two-way sampling device and a sampling method for geological exploration based on pit exploration to solve the above problems. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the existing defects and provide a two-way sampling device and sampling method for geological exploration based on pit exploration, which can sample on one side or on both sides at the same time, has high sampling efficiency, and can also stabilize the entire device through the sampling tubes on both sides during sampling, which can save manpower, and can avoid equipment damage caused by excessive load, reduce maintenance costs, and can also compare the hardness of rocks on both sides through the main shaft system. It has high working efficiency, simple operation, and easy use, and can effectively solve the problems in the background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A two-way sampling device for geological exploration based on pit exploration, comprising a mounting frame with a movable seat at the bottom, a main shaft system, a secondary shaft drilling system and a hydraulic propulsion system are installed on the mounting frame, and the main shaft system and the secondary shaft drilling system are connected by a magnetic coupler;

[0010] The main shaft system includes a main shaft sleeve rotatably arranged on a mounting frame in the middle, a main spline shaft is slidably arranged inside the main shaft sleeve, and main rotors with magnetic couplers are arranged at both ends of the main spline shaft;

[0011] The secondary shaft drilling system comprises a secondary shaft assembly, one end of which is provided with a secondary rotor corresponding to the main rotor, and the other end of which is provided with a sampling tube in a movable sleeve;

[0012] The hydraulic propulsion system includes a cylinder body and two symmetrically arranged hydraulic cylinders. Both ends of the cylinder body are provided with oil pipes connected to the corresponding hydraulic cylinder oil outlets. A piston is slidably arranged inside the cylinder body. Both ends of the piston are provided with push rods. The end of the push rod away from the piston is provided with a connecting plate rotatably connected to the main spline shaft.

[0013] As a preferred technical solution of the present invention, the length of the spline part of the main spline shaft is equal to the length of the main shaft sleeve, and a gear is provided in the middle of the main shaft sleeve.

[0014] As a preferred technical solution of the present invention, the secondary shaft assembly includes a secondary shaft sleeve rotatably arranged on mounting frames on both sides, a secondary spline shaft is movably inserted into the interior of one end of the secondary shaft sleeve close to the main rotor, the secondary rotor is mounted on the secondary spline shaft, and a clamping column is provided at the other end of the secondary shaft sleeve, and the sampling tube is movably sleeved on the clamping column.

[0015] As a preferred technical solution of the present invention, a servo motor is provided in the middle part of the side of the mounting frame for fixing the secondary shaft sleeve, and a screw is connected to the output shaft of the servo motor through a coupling, an adjustment plate is threadedly connected to the screw, and the upper end of the side of the adjustment plate is rotatably connected to the secondary spline shaft through a bearing.

[0016] As a preferred technical solution of the present invention, two limiting rings for limiting the position of the piston are symmetrically arranged inside the cylinder body.

[0017] As a preferred technical solution of the present invention, the oil inlet pipes of the two hydraulic cylinders are connected by a three-way pipe, and a three-way valve is provided on the three-way pipe.

[0018] As a preferred technical solution of the present invention, oil return pipelines are provided at both ends of the cylinder body.

[0019] As a preferred technical solution of the present invention, a push plate is provided at the telescopic end of the hydraulic cylinder, and the push plate is rotatably connected to the sampling tube.

[0020] A sampling method of a two-way sampling device for geological exploration based on pit exploration comprises the following steps:

[0021] S1. The entire sampling device is installed as a module on a movable vehicle, and the entire sampling device is moved to an appropriate position in the tunnel or exploration pit by the vehicle; the gear is connected to the external driving device through a chain, so that the external driving device drives the gear to rotate through the chain; in addition, the oil outlet pipe of the external hydraulic pump is connected to the three-way pipe, and the oil return pipeline on the cylinder body is connected to the external oil tank;

[0022] S2. Sampling includes unidirectional sampling and bidirectional sampling. In bidirectional sampling: the external driving device is controlled to work, and the external hydraulic pump is controlled to work. The driving device drives the gear to rotate. The gear drives the main spline shaft to rotate through the main shaft sleeve. Under the action of the magnetic coupler, the main spline shaft drives the secondary spline shaft to rotate. The secondary spline shaft drives the secondary shaft sleeve and the clamping column to rotate. The clamping column drives the sampling tube to rotate.

[0023] S3, the hydraulic cylinder extends and pushes the sampling tube to move horizontally through the connecting plate, and the sampling tube performs sampling operations during the rotation and horizontal movement;

[0024] S4. During the simultaneous sampling process on both sides, when the hardness difference of the rocks on both sides is large, the hydraulic cylinder corresponding to the side with the softer rock has a faster advancement speed, and more hydraulic oil flows into the cylinder body of the hydraulic cylinder corresponding to the side with the softer rock, thereby pushing the piston to move to the other side. During the movement of the piston, the push rod is driven to move, and the push rod drives the main spline shaft to move through the connecting plate. At the same time, the main spline shaft drives the two main rotors to move, and the air gaps of the two magnetic couplers change. The air gap of the magnetic coupler corresponding to the side with the harder rock becomes smaller, and the torque transmitted by the magnetic coupler becomes larger; conversely, the air gap of the magnetic coupler corresponding to the side with the softer rock becomes larger, and the torque transmitted by the magnetic coupler becomes smaller, thereby increasing the sampling speed of the rock on the harder side and slowing down the sampling speed of the rock on the softer side;

[0025] S41. After the main spline shaft moves horizontally, the spline part of the main spline shaft will be exposed from the main shaft sleeve, and the rock hardness corresponding to the exposed side of the spline part is greater.

[0026] As a preferred technical solution of the present invention, the unilateral sampling in S comprises the following steps:

[0027] First, the servo motor on the non-sampling side is controlled to work, and the servo motor on this side drives the screw to rotate. During the rotation of the screw, the auxiliary rotor on this side is driven to move away from the main rotor through the adjustment plate;

[0028] Then, the hydraulic cylinder is controlled to extend, and the sampling tube is pushed to move horizontally through the connecting plate, so that the sampling tubes on both sides are in contact with the rock wall; then the three-way valve is adjusted so that the hydraulic oil only flows to the hydraulic cylinder on the sampling side;

[0029] Finally, repeat steps S1 and S2 to perform sampling. During the sampling process, the piston will drive the main rotor on the sampling side to move horizontally through the push rod and the connecting plate. During the sampling process, the servo motor on the sampling side must also be controlled to rotate. The servo motor drives the screw to rotate. During the rotation of the screw, the auxiliary rotor on this side is driven to move toward the main rotor through the adjusting plate to ensure that the magnetic coupler on the sampling side can stably transmit torque.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The bidirectional sampling device for geological exploration based on pit exploration in the example of the present invention connects the main shaft system and the secondary shaft drilling system through a magnetic coupler, so that slippage can occur between the main shaft system and the secondary shaft drilling system, thereby avoiding excessive load caused by excessive rock hardness, protecting the external driving device, avoiding jamming of the external driving device, thereby avoiding damage to the external device, reducing maintenance costs, and improving the safety of the entire device.

[0032] 2. The bidirectional sampling device for geological exploration based on pit exploration in the example of the present invention can adjust the torque of the secondary shaft drilling system on both sides by adjusting the air gap of the magnetic coupler, and can sample on both sides at the same time, and can also sample on one side, which can improve the sampling efficiency.

[0033] 3. The bidirectional sampling device for geological exploration based on pit exploration in the example of the present invention adopts a double-sided sampling method. The sampling tubes on both sides stabilize each other. There is no need to fix the entire sampling device individually by hand or through equipment, which saves manpower and has low operating technical requirements.

[0034] 4. The bidirectional sampling device for geological exploration based on pit exploration in the example of the present invention can compare the hardness of rocks on both sides through the horizontal movement direction of the main spline shaft in the main shaft system when sampling on both sides at the same time. It can directly compare during the sampling process and is easy to operate.

[0035] 5. The bidirectional sampling device for geological exploration based on pit exploration in the example of the present invention can sample on one side or on both sides at the same time, with high sampling efficiency. During sampling, the entire device can be stabilized through the sampling tubes on both sides, which can save manpower, avoid equipment damage caused by excessive load, and reduce maintenance costs. The hardness of the rocks on both sides can also be compared through the spindle system, with high working efficiency, simple operation and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 It is a front view structural schematic diagram of the present invention;

[0038] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of ;

[0039] Figure 4 It is a structural schematic diagram of the spindle system of the present invention;

[0040] Figure 5 It is a cross-sectional structural schematic diagram of the cylinder body in the present invention;

[0041] Figure 6 It is a schematic diagram of the local structure of the present invention;

[0042] Figure 7 This is a schematic diagram of the device working when the rock on the left is harder and the rock on the right is softer.

[0043] In the figure: 1 moving seat, 2 mounting frame, 3 main shaft sleeve, 31 gear, 32 main spline shaft, 33 main rotor, 4 secondary shaft sleeve, 41 secondary spline shaft, 42 secondary rotor, 43 clamping column, 5 sampling tube, 6 hydraulic cylinder, 61 three-way pipe, 62 three-way valve, 63 oil pipe, 64 push plate, 7 cylinder body, 71 piston, 72 push rod, 73 limit ring, 74 connecting plate, 8 servo motor, 81 screw, 82 adjusting plate. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1-7The present invention provides a technical solution: a bidirectional sampling device for geological exploration based on pit exploration, comprising a mounting frame 2 with a moving seat 1 at the bottom, a main shaft system, a secondary shaft drilling system and a hydraulic propulsion system installed on the mounting frame 2, and the main shaft system and the secondary shaft drilling system are connected by a magnetic coupler, an external driving device drives the main shaft system to rotate, the main shaft system drives the secondary shaft drilling system to rotate through the magnetic coupler, and at the same time, the hydraulic propulsion system drives the secondary shaft drilling system to move horizontally, and the secondary shaft drilling system performs sampling operations under the actions of rotation and horizontal movement;

[0046] The main shaft system includes a main shaft sleeve 3 rotatably arranged on a mounting frame 2 in the middle, a main spline shaft 32 is slidably arranged inside the main shaft sleeve 3, and main rotors 33 with magnetic couplings are arranged at both ends of the main spline shaft 32;

[0047] The secondary shaft drilling system includes a secondary shaft assembly, one end of which is provided with a secondary rotor 42 corresponding to the main rotor 33, and the other end of the secondary shaft assembly is movably sleeved with a sampling tube 5. The secondary shaft assembly includes a secondary shaft sleeve 4 rotatably arranged on the mounting frame 2 on both sides, and a secondary spline shaft 41 is movably inserted in the internal part of the secondary shaft sleeve 4 close to the main rotor 33, and the secondary rotor 42 is mounted on the secondary spline shaft 41. A clamping column 43 is provided at the other end of the secondary shaft sleeve 4, and the sampling tube 5 is movably sleeved on the clamping column 43. The main rotor 33 and the secondary rotor 42 form a magnetic coupling, and an external driving device drives the gear 31 to rotate, and the gear 31 drives the main spline shaft 32 to rotate through the main shaft sleeve 3. Under the action of the magnetic coupling, the main spline shaft 32 drives the secondary spline shaft 41 to rotate, and the secondary spline shaft 41 drives the secondary shaft sleeve 4 and the clamping column 43 to rotate, and the clamping column 43 drives the sampling tube 5 to rotate;

[0048] The hydraulic propulsion system includes a cylinder body 7 and two symmetrically arranged hydraulic cylinders 6. Both ends of the cylinder body 7 are provided with oil pipes 63 connected to the corresponding oil outlets of the hydraulic cylinders 6. A piston 71 is slidably arranged inside the cylinder body 7. Both ends of the piston 71 are provided with push rods 72. The end of the push rod 72 away from the piston 71 is provided with a connecting plate 74 rotatably connected to the main spline shaft 32. The hydraulic cylinder 6 is extended and pushes the sampling tube 5 to move horizontally through the connecting plate 74. The sampling tube 5 performs sampling operations during the rotation and horizontal movement.

[0049] Furthermore, the length of the spline portion of the main spline shaft 32 is equal to the length of the main shaft sleeve 3 , and a gear 31 is provided in the middle of the main shaft sleeve 3 .

[0050] Furthermore, a servo motor 8 is provided in the middle part of the side of the mounting frame 2 for fixing the secondary shaft sleeve 4, and a screw 81 is connected to the output shaft of the servo motor 8 through a coupling, and an adjustment plate 82 is threadedly connected to the screw 81. The upper end of the side of the adjustment plate 82 is rotatably connected to the secondary spline shaft 41 through a bearing. The servo motor 8 drives the screw 81 to rotate, and during the rotation of the screw 81, the auxiliary rotor 42 is driven to move through the adjustment plate 82, so as to adjust the air gap of the magnetic coupling, thereby adjusting the torque size.

[0051] Furthermore, two limiting rings 73 for limiting the piston 71 are symmetrically arranged inside the cylinder body 7, which can prevent the piston 71 from excessively moving within a certain range and causing the magnetic coupler on one side to be unable to transmit torque.

[0052] Furthermore, the oil inlet pipes of the two hydraulic cylinders 6 are connected via a three-way pipe 61 , and a three-way valve 62 is provided on the three-way pipe 61 , so that the two hydraulic cylinders 6 can work simultaneously or independently.

[0053] Furthermore, both ends of the cylinder body 7 are provided with oil return pipelines connected to an external oil tank.

[0054] Furthermore, a push plate 64 is provided at the telescopic end of the hydraulic cylinder 6 , and the push plate 64 is rotatably connected to the sampling tube 5 .

[0055] A sampling method of a two-way sampling device for geological exploration based on pit exploration comprises the following steps:

[0056] S1. The entire sampling device is installed as a module on a movable vehicle, and the entire sampling device is moved to a suitable position in the tunnel or exploration pit by the vehicle; the gear 31 is connected to the external driving device through a chain, so that the external driving device drives the gear 31 to rotate through the chain; in addition, the oil outlet pipe of the external hydraulic pump is connected to the three-way pipe 61, and the oil return pipeline on the cylinder body 7 is connected to the external oil tank;

[0057] S2. Sampling includes unidirectional sampling and bidirectional sampling. In bidirectional sampling: the external driving device is controlled to work, and the external hydraulic pump is controlled to work. The driving device drives the gear 31 to rotate. The gear 31 drives the main spline shaft 32 to rotate through the main shaft sleeve 3. Under the action of the magnetic coupler, the main spline shaft 32 drives the secondary spline shaft 41 to rotate. The secondary spline shaft 41 drives the secondary shaft sleeve 4 and the clamping column 43 to rotate. The clamping column 43 drives the sampling tube 5 to rotate.

[0058] S3, the hydraulic cylinder 6 extends and pushes the sampling tube 5 to move horizontally through the connecting plate 74, and the sampling tube 5 performs sampling operation during the rotation and horizontal movement;

[0059] S4. During the simultaneous sampling process on both sides, when the hardness of the rocks on both sides is very different, such as Figure 7As shown, when the hardness of the left rock is large and the hardness of the right rock is small, the hydraulic cylinder 6 on the right side has a fast pushing speed, and more hydraulic oil flows into the right side of the cylinder body 7 through the right hydraulic cylinder 6, thereby pushing the piston 71 to move to the left. During the movement of the piston 71 to the left, the push rod 72 is driven to move to the left, and the push rod 72 drives the main spline shaft 32 to move to the left through the connecting plate 74. At the same time, the main spline shaft 32 drives the two main rotors 33 to move to the left. At this time, the air gap of the left magnetic coupler becomes smaller, the transmission torque becomes larger, and the sampling speed on the left side is increased; the air gap of the right magnetic coupler becomes larger, the transmission torque becomes smaller, and the sampling speed on the right side is reduced; during the entire sampling process, the moving direction of the piston 71 changes automatically according to the pushing speed of the rocks on both sides when sampling, without manual intervention and adjustment;

[0060] S41. After the main spline shaft 32 moves horizontally to the left, the splined portion of the left side of the main spline shaft 32 will be exposed from the left side of the main shaft sleeve 3, indicating that the rock hardness on the left side is large.

[0061] Further, the unilateral sampling in S2 includes the following steps:

[0062] First, the servo motor 8 on the non-sampling side is controlled to work, and the servo motor 8 on this side drives the screw 81 to rotate. During the rotation of the screw 81, the auxiliary rotor 42 on this side is driven to move away from the main rotor 33 through the adjustment plate 82;

[0063] Then, the hydraulic cylinder 6 is controlled to extend, and the sampling tube 5 is pushed to move horizontally through the connecting plate 74, so that the sampling tubes 5 on both sides are in contact with the rock wall; and the three-way valve 62 is adjusted so that the hydraulic oil only flows to the hydraulic cylinder 6 on the sampling side;

[0064] Finally, repeat steps S2 and S3 to perform sampling. During the sampling process, the piston 71 drives the main rotor 33 on the sampling side to move horizontally through the push rod 72 and the connecting plate 74. During the sampling process, the servo motor 8 on the sampling side needs to be controlled to rotate. The servo motor 8 drives the screw 81 to rotate. During the rotation of the screw 81, the auxiliary rotor 42 on this side is driven to move toward the main rotor 33 through the adjustment plate 82, ensuring that the magnetic coupler on the sampling side can stably transmit torque.

[0065] The present invention can sample on one side or on both sides simultaneously, and has high sampling efficiency. When sampling, the entire device can be stabilized through the sampling tubes 5 on both sides, which can save manpower, avoid equipment damage caused by excessive load, and reduce maintenance costs. The hardness of the rocks on both sides can also be compared through the main shaft system, and the working efficiency is high, the operation is simple, and it is easy to use.

[0066] The undisclosed parts in the present invention are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A two-way sampling device for geological exploration based on pit exploration, comprising a mounting frame (2) with a movable seat (1) at the bottom, characterized in that: The mounting frame (2) is equipped with a main shaft system, a secondary shaft drilling system and a hydraulic propulsion system, and the main shaft system and the secondary shaft drilling system are connected via a magnetic coupler; The main shaft system comprises a main shaft sleeve (3) rotatably arranged on a mounting frame (2) in the middle, a main spline shaft (32) being slidably arranged inside the main shaft sleeve (3), and main rotors (33) with magnetic couplers being arranged at both ends of the main spline shaft (32); The secondary shaft drilling system comprises a secondary shaft assembly, wherein a secondary rotor (42) corresponding to the main rotor (33) is provided at one end of the secondary shaft assembly, and a sampling tube (5) is movably sleeved at the other end of the secondary shaft assembly. The secondary shaft assembly comprises a secondary shaft sleeve (4) rotatably arranged on a mounting frame (2) at two sides, a secondary spline shaft (41) is movably inserted into the interior of one end of the secondary shaft sleeve (4) close to the main rotor (33), the secondary rotor (42) is mounted on the secondary spline shaft (41), a clamping column (43) is provided at the other end of the secondary shaft sleeve (4), the sampling tube (5) is movably sleeved on the clamping column (43), a servo motor (8) is provided at the middle part of the side of the mounting frame (2) for fixing the secondary shaft sleeve (4), a screw rod (81) is connected to the output shaft of the servo motor (8) via a coupling, an adjustment plate (82) is threadedly connected to the screw rod (81), and the upper end of the side of the adjustment plate (82) is rotatably connected to the secondary spline shaft (41) via a bearing; The hydraulic propulsion system comprises a cylinder body (7) and two symmetrically arranged hydraulic cylinders (6), both ends of the cylinder body (7) are provided with oil pipes (63) connected to the oil outlets of the corresponding hydraulic cylinders (6), a piston (71) is slidably arranged inside the cylinder body (7), both ends of the piston (71) are provided with push rods (72), and one end of the push rod (72) away from the piston (71) is provided with a connecting plate (74) rotatably connected to the main spline shaft (32).

2. The bidirectional sampling device for geological exploration based on pit exploration according to claim 1 is characterized in that: The length of the spline portion of the main spline shaft (32) is equal to the length of the main shaft sleeve (3), and a gear (31) is provided in the middle of the main shaft sleeve (3).

3. The bidirectional sampling device for geological exploration based on pit exploration according to claim 1 is characterized in that: Two limiting rings (73) for limiting the position of the piston (71) are symmetrically arranged inside the cylinder body (7).

4. The bidirectional sampling device for geological exploration based on pit exploration according to claim 1 is characterized in that: The oil inlet pipes of the two hydraulic cylinders (6) are connected via a three-way pipe (61), and a three-way valve (62) is provided on the three-way pipe (61).

5. The bidirectional sampling device for geological exploration based on pit exploration according to claim 1 is characterized in that: Oil return pipelines are provided at both ends of the cylinder body (7).

6. The bidirectional sampling device for geological exploration based on pit exploration according to claim 1, characterized in that: A push plate (64) is provided at the telescopic end of the hydraulic cylinder (6), and the push plate (64) is rotatably connected to the sampling tube (5).

7. A sampling method based on the bidirectional sampling device for geological exploration based on pit exploration according to claim 1, characterized in that: The following steps are involved: S1. The entire sampling device is installed as a module on a movable vehicle, and the entire sampling device is moved to an appropriate position in the tunnel or the exploration pit by the vehicle; the gear (31) is connected to an external driving device by a chain, so that the external driving device drives the gear (31) to rotate through the chain; in addition, the oil outlet pipe of the external hydraulic pump is connected to the three-way pipe (61), and the oil return pipe on the cylinder body (7) is connected to the external oil tank; S2. Sampling includes unidirectional sampling and bidirectional sampling. In bidirectional sampling: the external driving device is controlled to work, and the external hydraulic pump is controlled to work. The driving device drives the gear (31) to rotate. The gear (31) drives the main spline shaft (32) to rotate through the main shaft sleeve (3). Under the action of the magnetic coupler, the main spline shaft (32) drives the secondary spline shaft (41) to rotate. The secondary spline shaft (41) drives the secondary shaft sleeve (4) and the clamping column (43) to rotate. The clamping column (43) drives the sampling tube (5) to rotate. S3, the hydraulic cylinder (6) extends and pushes the sampling tube (5) to move horizontally through the connecting plate (74), and the sampling tube (5) performs sampling operations during the rotation and horizontal movement process; S4. During the simultaneous sampling process on both sides, when the hardness of the rocks on both sides is greatly different, the hydraulic cylinder (6) corresponding to the side with the softer rock has a faster pushing speed, and more hydraulic oil flows into the cylinder body (7) through the hydraulic cylinder (6) on this side, thereby pushing the piston (71) to move to the other side. During the movement of the piston (71), the push rod (72) is driven to move. The push rod (72) drives the main spline shaft (32) to move through the connecting plate (74). At the same time, the main spline shaft (32) drives the two main rotors (33) to move. The air gaps of the two magnetic couplers change. The air gap of the magnetic coupler corresponding to the side with the harder rock becomes smaller, and the torque transmitted through the magnetic coupler becomes larger. On the contrary, the air gap of the magnetic coupler corresponding to the side with the softer rock becomes larger, and the torque transmitted through the magnetic coupler becomes smaller, thereby increasing the sampling speed of the rock on the harder side and slowing down the sampling speed of the rock on the softer side. S41. After the main spline shaft (32) moves horizontally, the splined portion of the main spline shaft (32) will be exposed from the main shaft sleeve (3), and the rock hardness corresponding to the exposed side of the splined portion is relatively large.

8. The sampling method of the bidirectional sampling device for geological exploration based on pit exploration according to claim 7 is characterized in that: The unilateral sampling in S2 includes the following steps: First, the servo motor (8) on the non-sampling side is controlled to work, and the servo motor (8) on this side drives the screw (81) to rotate. During the rotation of the screw (81), the auxiliary rotor (42) on this side is driven to move in a direction away from the main rotor (33) through the adjustment plate (82); Then, the hydraulic cylinder (6) is controlled to extend, and the sampling tube (5) is pushed to move horizontally through the connecting plate (74), so that the sampling tubes (5) on both sides are in contact with the rock wall; and the three-way valve (62) is adjusted so that the hydraulic oil only flows to the hydraulic cylinder (6) on the sampling side; Finally, steps S2 and S3 are repeated to perform sampling. During the sampling process, the piston (71) drives the main rotor (33) on the sampling side to move horizontally through the push rod (72) and the connecting plate (74). During the sampling process, the servo motor (8) on the sampling side needs to be controlled to rotate. The servo motor (8) drives the screw (81) to rotate. During the rotation of the screw (81), the auxiliary rotor (42) on this side is driven to move in a direction close to the main rotor (33) through the adjustment plate (82), thereby ensuring that the magnetic coupler on the sampling side can stably transmit torque.

Images