A sampling device and method for groundwater investigation and monitoring

Abstract

The present invention provides a sampling device and method for groundwater investigation and monitoring, which relates to the field of land and resources monitoring technology, including a sampling body, the sampling body is connected to a sleeve through a driving mechanism, the sleeve is detachably connected to a drill bit, and the driving mechanism can drive the drill bit to screw into the soil; the sleeve is provided with an opening for water inlet, and a movable plate that can close the opening is rotatably connected to the opening, and the movable plate is connected to the sleeve through a torsion spring; the sleeve is slidably connected to a push rod that can push the movable plate open, and also includes a tension spring that can leave a gap between the push rod and the movable plate. The device is easy to operate, can accurately sense the location of groundwater and take samples, can effectively avoid backflow during sampling, and can simultaneously perform multiple classified samplings, with high sampling efficiency and good sampling quality.

Description

Technical Field

[0001] The present invention relates to the technical field of land resources monitoring, and in particular to a sampling device and method for groundwater investigation and monitoring. Background Art

[0002] Land and resources monitoring work mainly includes land use dynamic monitoring, groundwater monitoring, geological disaster monitoring and mine geological environment monitoring.

[0003] During the groundwater investigation and monitoring process, sampling is required; after searching, the patent with publication number CN216899732U discloses a shallow groundwater sampling device for preventing groundwater backflow, including a tube body, a bottom cone is connected to the bottom of the tube body through a thread, and a sealing cover is connected to the top of the tube body through a thread, a connecting frame is fixedly installed in the tube body, and a rotating frame is rotatably connected in the connecting frame, a screw is connected to the bottom of the rotating frame through the connecting frame, and a sealing plate is connected to the outside of the screw through a thread, a rotating handle is connected to the top of the rotating frame through a thread, and a rubber pad is provided in the tube body, a sealing tube is fixedly installed on the top of the rotating frame, and the sealing tube is connected to the sealing cover, and a grab rod is fixedly installed on the outside of the tube body.

[0004] However, the above device still has the following problems: although it can prevent groundwater backflow when sampling, due to the different depths of groundwater, especially in the field, it is impossible to accurately judge the depth of the underground aquifer. The staff needs to rely on their sense to lower the sampling device to an appropriate depth to achieve sampling. The sampling efficiency is low, the sampling quality is poor, and it does not have a classified sampling function. Summary of the invention

[0005] Aiming at the deficiencies of the prior art, the present invention proposes a sampling device and method for groundwater investigation and monitoring.

[0006] The technical solution of the present invention to solve the technical problem is:

[0007] The present invention provides a sampling device and method for groundwater investigation and monitoring, comprising a sampling body, wherein the sampling body is connected to a sleeve via a driving mechanism, the sleeve is detachably connected to a drill bit, and the driving mechanism can drive the drill bit to screw into the soil; the sleeve is provided with an opening for water intake, a movable plate is rotatably connected to the opening and can close the opening, and the movable plate is connected to the sleeve via a torsion spring; the sleeve is slidably connected to a push rod which can push the movable plate open, and also comprises a tension spring which can leave a gap between the push rod and the movable plate.

[0008] Preferably, a main shaft is rotatably connected inside the sleeve, a plurality of sampling tubes are detachably connected to the main shaft, a fixed tube is fixedly connected inside the sleeve, a movable tube is slidably connected inside the sleeve, and water can flow into the sampling tube through the opening, the movable tube and the fixed tube in sequence.

[0009] Preferably, the movable tube is connected to the sleeve via a tension spring, the push rod is fixedly connected to the movable tube, and a filter screen is detachably connected inside the movable tube.

[0010] Preferably, when a gap is left between the push rod and the movable plate, the movable tube and the fixed tube are staggered; when the push rod pushes the movable plate open, the movable tube moves to be connected with the fixed tube.

[0011] Preferably, the movable tube is slidably connected with a clamping rod that moves in a vertical direction, the fixed tube is provided with a clamping hole for the clamping rod to slide into, and the clamping rod is connected to the movable tube via a fourth spring.

[0012] Preferably, the sleeve is slidably connected to a reset rod which moves in a vertical direction, an upper end of the reset rod is provided with a movable hole into which the clamping rod can slide, and the reset rod is connected to the sleeve via a first spring.

[0013] Preferably, the sleeve is slidably connected to a guide rod that moves in a vertical direction, the guide rod is connected to the sleeve via a second spring, a pressure rod is slidably connected inside the sampling tube, the pressure rod can press the guide rod downward, and one end of the guide rod can press the reset rod downward.

[0014] Preferably, the other end of the guide rod is connected to a slider via a third spring, and the main shaft is fixedly connected to a cylindrical cam; the cylindrical cam is provided with a slide groove, and the slide groove includes an oblique groove and a vertical groove that are interconnected, and the slider is slidably arranged in the slide groove, and the bottom end of the slide groove is connected to a ratchet that allows the slider to slide in only one direction.

[0015] Preferably, the driving mechanism includes a cylinder and a motor, the cylinder is connected to a connecting rod, the connecting rod is connected to a motor, and the motor is connected to the sleeve; a spring switch that can cooperate with the movable plate is also provided at the opening, and the cylinder, spring switch and motor are connected to a controller.

[0016] The present invention also proposes a sampling method for groundwater investigation and monitoring, which uses the above-mentioned sampling device for groundwater investigation and monitoring, and includes the following steps:

[0017] S1: The driving mechanism drives the drill bit to rotate into the soil. The driving mechanism keeps the driving speed of the drill bit constant. As the drill bit rotates into the aquifer, the speed of the drill bit increases, driving the speed of the sleeve to increase. Under the action of centrifugal force, the tension spring is further stretched, and the push rod pushes the movable plate open.

[0018] S2: As the moving tube moves, the clamping rod moves into the clamping hole, and water flows into the sampling tube through the opening, the moving tube and the fixed tube in sequence. As the amount of water increases, the pressure rod is driven down, and the pressure rod drives the guide rod down, and the guide rod drives the slider to slide in the vertical groove. At this time, the second spring is compressed;

[0019] S3: When the slider slides into the inclined groove, under the action of the second spring, the slider slides in the inclined groove, driving the cylindrical cam to rotate, and the cylindrical cam drives the new sampling tube to move to the bottom of the fixed tube. At the same time, the guide rod drives the reset rod to descend, and the reset rod drives the clamping rod to descend, so that the clamping rod moves out of the clamping hole, the tension spring drives the mobile tube to reset, and the torsion spring drives the movable plate to rotate, so that the opening is closed, and the sampling is completed.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] 1. The device is provided with a drill bit, which can be screwed into the soil. When the drill bit is screwed into the aquifer, the speed of the drill bit slows down. When the drill bit is screwed into the aquifer, the soil becomes moist and loose. Under the condition of unchanged driving force, the speed of the drill bit speeds up, indicating that the drill has been drilled into the aquifer. Under the action of centrifugal force, the top rod can push the movable plate to open to achieve water inlet. The operation is convenient, the location of groundwater can be accurately sensed and sampling can be carried out, the sampling efficiency is high, and the sampling quality is good.

[0022] 2. The device is provided with a movable tube. After the sampling is completed, the water flow will drive the pressure rod to descend, the pressure rod will drive the reset rod to descend, the reset rod will pull the clamping rod to descend, and the tension spring can drive the movable tube to reset, and the torsion spring can drive the movable plate to reset, so that the opening is closed, and the sampling port can be automatically sealed after the sampling is completed. Backflow can be effectively avoided during sampling, and the opening can be automatically sealed after the sampling is completed, and the pollution to the sampling tube can be effectively reduced.

[0023] 3. The device is provided with a plurality of sampling tubes. The pressure rod can drive the guide rod to descend. When water is introduced, when the slider slides in the vertical groove, when the slider slides into the inclined groove, the spring can push the slider to slide in the inclined groove, and the cylindrical cam can be driven to rotate, so that the sampling tube filled with water can be rotated to one side, and the new sampling tube can be transferred to the bottom of the fixed tube, so that the sampling tube can be automatically replaced after the sampling is completed, and multiple classification sampling can be realized, and sampling work at different depths can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of area A in the middle.

[0027] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of region B in the middle.

[0028] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of the middle C region.

[0029] Figure 5 for Figure 2 Schematic diagram of the enlarged structure of the D region in the middle.

[0030] Figure 6 for Figure 2 A three-dimensional diagram of the structure of the middle sampling tube.

[0031] Figure 7 for Figure 2 Schematic diagram of the structure of the middle clamp rod.

[0032] Description of reference numerals in the figures:

[0033] 1. Cylinder; 11. Sampling body; 2. Connecting rod; 21. Motor; 3. Drill bit; 31. Sleeve; 32. Fixed tube; 33. Reset rod; 34. First spring; 35. Spring switch; 36. Movable plate; 37. Clamping hole; 38. Movable hole; 41. Cylindrical cam; 42. Sampling tube; 43. Pressing rod; 44. Guide rod; 45. Second spring; 46. Slider; 5. Moving tube; 51. Tension spring; 52. Filter; 53. Push rod; 54. Clamping rod; 55. Fourth spring; 61. Vertical slot; 62. Oblique slot. DETAILED DESCRIPTION

[0034] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[0035] like Figures 1 to 7 As shown, this embodiment proposes a sampling device for groundwater investigation and monitoring, including a sampling body 11, the sampling body 11 is connected to a sleeve 31 through a driving mechanism, the sleeve 31 is detachably connected to a drill bit 3, the driving mechanism can drive the drill bit 3 to screw into the soil, and the driving mechanism can drive the drill bit 3 to rotate and move in the vertical direction at the same time, thereby realizing the drilling action.

[0036] The sampling body 11 has different lengths to adapt to sampling work in different situations. For a longer sampling body 11, due to its heavy overall mass, the sampling body 11 can be fixedly connected to the vehicle body by bolts, and the vehicle body can facilitate the walking and support of the sampling body 11. For a shorter sampling body 11, the operator can directly hold it in hand to achieve sampling.

[0037] An opening for water inlet is provided on one side of the sleeve 31, and a movable plate 36 is rotatably connected to the opening to close the opening. The movable plate 36 is connected to the sleeve 31 through a torsion spring, and the lower end of the movable plate 36 is rotatably connected to the sleeve 31. In the initial state, under the action of the torsion spring, the movable plate 36 and the sleeve 31 are in contact with each other. At this time, the movable plate 36 closes the opening, and water will not enter.

[0038] The driving mechanism includes a cylinder 1 and a motor 21. The cylinder 1 is fixedly connected to the sampling body 11. The cylinder 1 is connected to a connecting rod 2. The connecting rod 2 and the sampling body 11 are slidably connected, and the connecting rod 2 can only move in the vertical direction. The cylinder 1 can drive the connecting rod 2 to reciprocate in the vertical direction. Through the setting of the cylinder 1, the drill bit 3 can be driven to descend, thereby realizing drilling.

[0039] The connecting rod 2 is connected to a motor 21, which is connected to a sleeve 31. The sleeve 31 is rotatably connected to the connecting rod 2. The motor 21 can drive the sleeve 31 to rotate, and the sleeve 31 can drive the drill bit 3 to rotate. The drill bit 3 can be detachably connected to the sleeve 31 by a threaded connection. The rotation direction of the drill bit 3 is compatible with the thread rotation direction. Therefore, as the drill bit 3 rotates, the connection between the drill bit 3 and the sleeve 31 will become tighter and tighter, and will not come off.

[0040] A spring switch 35 is also provided at the opening, and the spring switch 35 is connected to the sleeve 31. The spring switch 35, the motor 21 and the cylinder 1 are connected to a controller. When drilling the ground, the controller controls the motor 21 and the cylinder 1 to work simultaneously to realize the drilling of the drill bit 3. The spring switch 35 can transmit a corresponding signal to the controller, and the controller can control the motor 21 and the cylinder 1 to stop working, and sampling is performed at this time.

[0041] An alarm and an indicator light may also be connected to the upper end of the sampling body 11, and both the alarm and the indicator light are connected to the spring switch 35. When the movable plate 36 is closed and touches the spring switch 35, the spring switch 35 may control the alarm and the indicator light to work and issue an early warning, indicating that the aquifer has been drilled into and groundwater sampling is being carried out. The connecting rod 2 is also connected to a scale line, through which the depth of the soil at this time can be observed, thereby obtaining the depth of the aquifer.

[0042] The spring switch 35 is a commonly used electronic switch device, and its working principle is to control the opening and closing of the circuit by compressing and releasing a spring. The spring switch 35 is usually composed of a fixed contact and a movable contact.

[0043] When no force is applied, the spring switch 35 is in a relaxed state, and the circuit between the two contacts is disconnected. When force is applied to make the movable contact contact with the fixed contact, the circuit is closed and current can pass. The elasticity of the spring makes it possible for the spring to return to its original state when the force is released, separating the movable contact from the fixed contact and disconnecting the circuit. This achieves the control of the opening and closing of the circuit by applying and releasing force.

[0044] The sleeve 31 is slidably connected to a push rod 53 that can push open the movable plate 36, and also includes a tension spring 51 that can leave a gap between the push rod 53 and the movable plate 36. Under the action of the tension spring 51, in the initial state, a certain gap is left between the push rod 53 and the movable plate 36, so the push rod 53 will not push open the movable plate 36.

[0045] A main shaft is rotatably connected inside the sleeve 31, and the main shaft is arranged in a vertical direction. The main shaft is detachably connected to a plurality of sampling barrels 42. The sampling barrel 42 and the main shaft can be detachably connected by bolt connection, so as to facilitate the taking and placing of the sampling barrel 42. A switch door can be opened on one side of the sleeve 31, and after the switch door is opened, it is convenient to take and place the sampling barrel 42.

[0046] A fixed tube 32 is fixedly connected inside the sleeve 31, and a movable tube 5 is slidably connected inside the sleeve 31. The movable tube 5 can slide in the horizontal direction. A filter screen 52 is detachably connected inside the movable tube 5. The filter screen 52 is used to filter water. Water can flow into the sampling tube 42 through the opening, the movable tube 5 and the fixed tube 32 in sequence.

[0047] The movable tube 5 is connected to the sleeve 31 via a tension spring 51, one end of the tension spring 51 is connected to the movable tube 5, and the other end of the tension spring 51 is connected to the sleeve 31. The push rod 53 is fixedly connected to the movable tube 5. In the initial state, under the action of the tension spring 51, a suitable gap is left between the push rod 53 and the movable plate 36.

[0048] In the initial state, under the action of the tension spring 51, a gap is left between the push rod 53 and the movable plate 36, and the movable tube 5 and the fixed tube 32 are staggered, and the movable tube 5 and the fixed tube 32 are not connected. At this time, the outer walls of the movable tube 5 and the fixed tube 32 are in contact. When the movable tube 5 moves horizontally, when the push rod 53 moves to just push the movable plate 36 open, the movable tube 5 moves to be connected with the fixed tube 32. At this time, water can flow into the sampling tube 42 through the opening, the movable tube 5 and the fixed tube 32.

[0049] The movable tube 5 is slidably connected with a clamping rod 54 which moves in the vertical direction. The fixed tube 32 is provided with a clamping hole 37 for the clamping rod 54 to slide into. The clamping rod 54 is connected to the movable tube 5 through a fourth spring 55. The fourth spring 55 is sleeved on the clamping rod 54. One end of the fourth spring 55 is connected to the clamping rod 54, and the other end of the fourth spring 55 is connected to the movable tube 5. Under the action of the fourth spring 55, the clamping rod 54 can slide into the clamping hole 37, thereby realizing the limiting work after the movable tube 5 moves.

[0050] The sleeve 31 is slidably connected with a reset rod 33 that moves in the vertical direction. A movable hole 38 is provided at the upper end of the reset rod 33 for the locking rod 54 to slide into. The reset rod 33 is connected to the sleeve 31 through a first spring 34. The first spring 34 is sleeved on the reset rod 33. One end of the first spring 34 is connected to the reset rod 33, and the other end of the first spring 34 is connected to the sleeve 31. The reset rod 33 is located on one side of the locking rod 54.

[0051] The aperture of the movable hole 38 is suitable enough. As the movable tube 5 moves, the movable tube 5 can drive the clamping rod 54 to slide into the movable hole 38. The clamping rod 54 can move horizontally and vertically in the movable hole 38, thereby providing sufficient activity space for the movement of the clamping rod 54. When the clamping rod 54 is located in the movable hole 38, when the reset rod 33 descends, it can drive the clamping rod 54 to descend, thereby releasing the limit of the movable tube 5, and the tension spring 51 can pull the movable tube 5 to reset, and the torsion spring drives the movable plate 36 to reset, thereby realizing automatic sealing of the opening.

[0052] The sleeve 31 is slidably connected with a guide rod 44 that moves in a vertical direction. The guide rod 44 is connected to the sleeve 31 through a second spring 45. A pressure rod 43 is slidably connected in the sampling tube 42. The pressure rod 43 can press the guide rod 44 downward, and one end of the guide rod 44 can press the reset rod 33 downward.

[0053] The pressure rod 43 and the sampling tube 42 are slidably connected, and the friction between the two is suitable enough. In the initial state, under the action of friction, the pressure rod 43 is located above the sampling tube 42. At this time, the lowest point of the pressure rod 43 is still higher than the highest point of the guide rod 44, which facilitates the cooperation between the pressure rod 43 and the guide rod 44. As the water flow continues to enter the sampling tube 42, the pressure rod 43 can be driven to descend, and the pressure rod 43 can press the guide rod 44 downward.

[0054] The drill bit 3 is provided with an annular groove, which is convenient for assembly. The second spring 45 is slidably arranged in the annular groove. The second spring 45 is located below the guide rod 44. The upper end of the second spring 45 is connected to the guide rod 44, and the lower end of the second spring 45 is located in the annular groove. The sleeve 31 is fixedly connected with a limit block for limiting the guide rod 44. When the guide rod 44 and the limit block are in contact, the guide rod 44 is at the highest point, and the second spring 45 is always in a compressed state. The second spring 45 is used for resetting the guide rod 44. When the pressure rod 43 descends, the guide rod 44 can be pressed down. When the guide rod 44 moves downward, the reset rod 33 can be driven to descend.

[0055] The other end of the guide rod 44 is connected to a slider 46 via a third spring. The third spring is located between the slider 46 and the guide rod 44. One end of the third spring is connected to the slider 46, and the other end of the third spring is connected to the guide rod 44. The slider 46 and the guide rod 44 are slidably connected.

[0056] The main shaft is fixedly connected with a cylindrical cam 41, and the cylindrical cam 41 is provided with a slide groove, which includes an oblique groove 62 and a vertical groove 61 that are connected to each other. The two ends of the vertical groove 61 are respectively connected with the oblique groove 62. The slider 46 is slidably set in the slide groove, and the bottom end of the slide groove is connected with a ratchet that allows the slider to slide in only one direction.

[0057] Taking the ratchet set in the vertical groove 61 as an example, under the action of the ratchet, when the second spring 45 pushes the slider 46 upward, due to the limitation of the ratchet, the slider 46 cannot move upward, and the slider 46 can only move downward. Therefore, when the slider 46 moves into the inclined groove 62, the second spring 45 pushes the slider 46 upward through the guide rod 44, and the slider 46 can slide in the inclined groove 62 to realize the rotation of the main shaft, thereby realizing the automatic replacement of the sampling tube 42.

[0058] The third spring can keep the slider 46 in contact with the ratchet teeth at all times. The elastic force of the second spring 45 is adequate and much greater than the friction force required for the main shaft to rotate. Therefore, when the slider 46 slides into the inclined groove 62, the main shaft can be driven to rotate.

[0059] A sampling method for groundwater investigation and monitoring, using the above-mentioned sampling device for groundwater investigation and monitoring, comprises the following steps:

[0060] S1: The driving mechanism drives the drill bit 3 to rotate into the soil. The driving mechanism keeps the driving speed of the drill bit 3 constant. As the drill bit 3 rotates into the aquifer, the speed of the drill bit 3 increases, driving the speed of the sleeve 31 to increase. Under the action of centrifugal force, the tension spring 51 is further stretched, and the push rod 53 pushes the movable plate 36 open.

[0061] S2: As the movable tube 5 moves, the clamping rod 54 moves into the clamping hole 37, and water flows into the sampling tube 42 through the opening, the movable tube 5 and the fixed tube 32 in sequence. As the amount of water increases, the pressure rod 43 is driven down, and the pressure rod 43 drives the guide rod 44 to move down. The guide rod 44 drives the slider 46 to slide in the vertical groove 61, and the second spring 45 is compressed at this time;

[0062] S3: When the slider 46 slides into the inclined groove 62, under the action of the second spring 45, the slider 46 slides in the inclined groove 62, and the cylindrical cam 41 drives the new sampling tube 42 to move to the bottom of the fixed tube 32. At the same time, the guide rod 44 drives the reset rod 33 to descend, and the reset rod 33 drives the clamping rod 54 to descend, so that the clamping rod 54 moves out of the clamping hole 37, the tension spring 51 drives the movable tube 5 to reset, and the torsion spring drives the movable plate 36 to rotate, so that the opening is closed, and the sampling is completed.

[0063] Although the above describes the specific implementation mode of the invention in conjunction with the drawings, it is not intended to limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A sampling device for groundwater investigation and monitoring, comprising a sampling body (11), characterized in that: The sampling body (11) is connected to a sleeve (31) via a driving mechanism, the sleeve (31) is detachably connected to a drill bit (3), and the driving mechanism drives the drill bit (3) to be screwed into the soil; the sleeve (31) is provided with an opening for water inlet, the opening is rotatably connected to a movable plate (36) for closing the opening, and the movable plate (36) is connected to the sleeve (31) via a torsion spring; the sleeve (31) is slidably connected to a push rod (53) for pushing the movable plate (36) open, and further comprises a tension spring (51) for leaving a gap between the push rod (53) and the movable plate (36); A main shaft is rotatably connected inside the sleeve (31), a plurality of sampling tubes (42) are detachably connected to the main shaft, a fixed tube (32) is fixedly connected inside the sleeve (31), a movable tube (5) is slidably connected inside the sleeve (31), and water flows into the sampling tube (42) through the opening, the movable tube (5) and the fixed tube (32) in sequence; The movable tube (5) is connected to the sleeve (31) via a tension spring (51), the push rod (53) is fixedly connected to the movable tube (5), and a filter screen (52) is detachably connected inside the movable tube (5); When a gap is left between the push rod (53) and the movable plate (36), the movable tube (5) and the fixed tube (32) are arranged in a staggered manner; when the push rod (53) pushes the movable plate (36) open, the movable tube (5) moves to communicate with the fixed tube (32); The movable tube (5) is slidably connected to a clamping rod (54) that moves in a vertical direction, the fixed tube (32) is provided with a clamping hole (37) for the clamping rod (54) to slide into, and the clamping rod (54) is connected to the movable tube (5) via a fourth spring (55); The sleeve (31) is slidably connected to a reset rod (33) that moves in a vertical direction. The upper end of the reset rod (33) is provided with a movable hole (38) for the locking rod (54) to slide into. The reset rod (33) is connected to the sleeve (31) via a first spring (34). The sleeve (31) is slidably connected to a guide rod (44) that moves in a vertical direction. The guide rod (44) is connected to the sleeve (31) via a second spring (45). A pressure rod (43) is slidably connected inside the sampling tube (42). The pressure rod (43) presses the guide rod (44) downward. One end of the guide rod (44) can press the reset rod (33) downward. The other end of the guide rod (44) is connected to a slider (46) via a third spring, and the main shaft is fixedly connected to a cylindrical cam (41); the cylindrical cam (41) is provided with a slide groove, the slide groove comprises an oblique groove (62) and a vertical groove (61) which are interconnected, the slide groove (46) is slidably arranged in the slide groove, and the bottom end of the slide groove is connected to a ratchet which enables the slide groove to slide in only one direction.

2. A sampling device for groundwater investigation and monitoring according to claim 1, characterized in that: The driving mechanism comprises a cylinder (1) and a motor (21); the cylinder (1) is connected to a connecting rod (2); the connecting rod (2) is connected to the motor (21); the motor (21) is connected to the sleeve (31); a spring switch (35) cooperating with a movable plate (36) is also provided at the opening; the cylinder (1), the spring switch (35) and the motor (21) are connected to a controller.

3. A sampling method for groundwater investigation and monitoring, characterized in that: The sampling device for groundwater investigation and monitoring according to claim 1 comprises the following steps: S1: The driving mechanism drives the drill bit (3) to rotate into the soil. The driving mechanism keeps the driving speed of the drill bit (3) constant. As the drill bit (3) is rotated into the aquifer, the speed of the drill bit (3) increases, driving the speed of the sleeve (31) to increase. Under the action of centrifugal force, the tension spring (51) is further stretched, and the push rod (53) pushes the movable plate (36) open. S2: As the movable tube (5) moves, the clamping rod (54) moves into the clamping hole (37), and water flows into the sampling tube (42) through the opening, the movable tube (5) and the fixed tube (32) in sequence. As the amount of water increases, the pressure rod (43) is driven to move downward, the pressure rod (43) drives the guide rod (44) to move downward, and the guide rod (44) drives the slider (46) to slide in the vertical groove (61). At this time, the second spring (45) is compressed; S3: When the slider (46) slides into the inclined groove (62), under the action of the second spring (45), the slider (46) slides in the inclined groove (62), driving the cylindrical cam (41) to rotate, and the cylindrical cam (41) drives the new sampling tube (42) to move to the bottom of the fixed tube (32). At the same time, the guide rod (44) drives the reset rod (33) to descend, and the reset rod (33) drives the clamping rod (54) to descend, so that the clamping rod (54) moves out of the clamping hole (37). The tension spring (51) drives the movable tube (5) to reset, and the torsion spring drives the movable plate (36) to rotate, so that the opening is closed, and the sampling is completed.

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