A soil and groundwater detection sampling device

Abstract

The application discloses a soil and underground water detection sampling device, and relates to the technical field of water body sampling, which comprises a support, a sampling cylinder, a lifting air cylinder, a plurality of gathering claws, an unfolding mechanism arranged on the sampling cylinder, a sampling mechanism arranged on the sampling cylinder, and the like. The plurality of gathering claws are used for closing the mouth of the sampling cylinder. The unfolding mechanism is used for driving the plurality of gathering claws to be unfolded or gathered synchronously. The sampling mechanism is used for completing a water absorption sampling action after the plurality of gathering claws are unfolded. The plurality of gathering claws are arranged. After the air cylinder drives the sampling cylinder to be inserted into soil, the gathering claws facilitate the sampling cylinder to be smoothly inserted into the soil. After being inserted into position, the plurality of gathering claws are unfolded. During the unfolding process, the gathering claws can extrude the soil around the gathering claws. During the extrusion process, underground water in the soil enters the gathering claws through water filtering holes, and then the water absorption mechanism absorbs the underground water between the gathering claws, so that water content sampling and detection can be performed on the soil with little water content.

Description

Technical Field

[0001] This invention relates to the field of water sampling technology, specifically to a soil and groundwater testing and sampling device. Background Technology

[0002] The cultivation of crops largely depends on groundwater in the soil, so the composition of soil moisture has a significant impact on crops. Since crops are directly related to food safety, it is necessary to sample and test groundwater in the soil in some regions or environments.

[0003] Chinese Patent Publication No. CN217586395U discloses a soil and groundwater sampling and testing device, including a support mounting base, a support frame, an electric telescopic rod, a conical fixing head, a testing box, a sampling component, and a control button. The support frame is hinged to the lower wall of the support mounting base, the electric telescopic rod is mounted on the support frame, the conical fixing head is located at one end of the electric telescopic rod, the testing box is located above the support mounting base, the sampling component is located on the support mounting base, and the control button is located on the front wall of the support mounting base. The sampling component includes a telescopic structure and a sampling structure, with the telescopic structure mounted on the support mounting base and the sampling structure mounted on the telescopic structure.

[0004] In the above-mentioned prior art sampling device, when sampling water, a conical head is drilled into the soil, and then a suction pump is used to extract groundwater from the soil. However, since the water content in soil is generally much smaller than the soil content, the method of using a suction pump to extract groundwater from the soil is only suitable for soil environments with significantly higher groundwater content. This makes it impossible or inconvenient to sample soil environments with lower groundwater content.

[0005] Therefore, we propose a soil and groundwater testing and sampling device. Summary of the Invention

[0006] The purpose of this invention is to provide a soil and groundwater testing and sampling device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a soil and groundwater testing and sampling device, comprising: support; The sampling cylinder is driven to move up and down by a lifting cylinder mounted on the bracket. The sampling cylinder is hollow inside and open at the bottom. Multiple gathering claws with filter holes on their surfaces are arranged in an array and hinged to the lower end of the sampling cylinder along the axial direction of the sampling cylinder, and the multiple gathering claws close the opening of the sampling cylinder after being retracted. An unfolding mechanism is provided on the sampling cylinder, which is used to drive the multiple gathering claws to unfold or retract synchronously; A sampling mechanism is provided on the sampling cylinder, which is used to complete the water absorption and sampling action after the plurality of the gathering claws are deployed.

[0008] Furthermore, the support includes: The base has a through hole in the middle for the sampling tube to pass through freely; The mounting bracket is fixed to the base, and the lifting cylinder is vertically installed on the horizontal section of the mounting bracket.

[0009] Furthermore, the deployment mechanism includes: The first sliding block engages within the sampling cylinder and can slide freely up and down; A lifting rod, which is fixed to the lower end face of the first sliding block and coaxial with the sampling cylinder; Multiple hinge rods are arranged in an array along the axial direction of the lifting rod and hinged to the lower end of the lifting rod. The end of the hinge rod away from the lifting rod is correspondingly hinged to the inner wall of the gathering claw. A lifting device is used to drive the first sliding block to move vertically.

[0010] Furthermore, the lifting device includes: A baffle is fitted onto the sampling cylinder and can slide freely up and down. A connecting rod is fixedly connected to the annular hole of the baffle. The sampling cylinder has an oblong hole for the connecting rod to pass through freely. A connecting column is fixedly connected to the part of the connecting rod located inside the sampling cylinder. The second sliding block is fixedly connected to the lower end of the connecting column; The first rack is fixed to the lower end face of the second sliding block; The second rack is fixed to the upper end face of the first sliding block; The gear is pivotally connected to the sampling cylinder, and the first rack and the second rack mesh with the gear, with the first rack and the second rack located on opposite radial sides of the gear.

[0011] Furthermore, an end cap is fitted onto the upper end of the sampling cylinder, and a return spring is wound around the sampling cylinder. The two ends of the return spring elastically abut against the end cap and the baffle, respectively, in the direction of the spring force.

[0012] Furthermore, the sampling mechanism includes: A fixing plug is fixedly engaged inside the sampling cylinder, and the fixing plug is located below the first sliding block; The movable plug is engaged within the sampling cylinder and can slide freely up and down. The movable plug is located below the fixed plug and is sleeved on the lifting rod, moving up and down with the lifting rod. A water suction hole is coaxially formed inside the lifting rod and penetrates the lower end face of the lifting rod. A communication port communicating with the water suction hole is formed at the upper end of the lifting rod. A sealing device is connected to the lower end of the lifting rod, and after the lifting rod moves down to its position, the lower opening of the water suction hole is opened.

[0013] Furthermore, the sealing device includes: A sliding rod, which is coaxially inserted through the lower end of the lifting rod and slides freely on the lifting rod; A float plate, the float plate being fixed to one end of the sliding rod extending between the plurality of the gathering claws; A sealing block is fixed to the other end of the sliding rod. The sampling cylinder has an installation cavity for the sealing block to pass through freely. The installation cavity is connected to the water absorption hole and its inner diameter is larger than the outer diameter of the sealing block. The lower end face of the sampling cylinder has multiple through-hole-shaped water inlets. The orthographic projection area of ​​the sealing block covers the water inlets.

[0014] Furthermore, the water inlets are arranged in an array along the axial direction of the sampling tube.

[0015] Furthermore, a buffer spring is vertically installed inside the mounting cavity, with its two ends elastically abutting against the top wall of the mounting cavity and the sealing block, respectively, in the direction of its elastic force.

[0016] Furthermore, the surface of the sealing block is provided with a rubber layer.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention features multiple converging claws. After the cylinder drives the sampling tube to be inserted into the soil, the converging claws facilitate the smooth insertion of the sampling tube into the soil. Once inserted, the multiple converging claws unfold. During the unfolding process, the converging claws can compress the surrounding soil. During the compression process, groundwater in the soil will enter between the converging claws through the water filter holes. Then, the water suction mechanism will absorb the groundwater between the converging claws, thereby enabling moisture sampling and testing of soil with low water content. This invention involves inserting a sampling tube into the soil, causing a baffle to contact the soil surface. As the baffle moves upward, it drives a first rack to move upward relative to a gear and engage with the gear. Simultaneously, the gear engages with a second rack, which in turn drives a first sliding block to move downward. This allows the lifting rod to move downward relative to the sampling tube as the baffle moves upward relative to the sampling tube. This causes the hinge rod to push the condensing claw to unfold. As the sampling tube moves downward into position, the condensing claw unfolds automatically, and as the sampling tube is pulled out from the ground surface, the condensing claw retracts automatically. Furthermore, the unfolding of the condensing claw compresses the surrounding soil, allowing groundwater in the soil to enter between the condensing claws through the filter holes. The operation is simple. This invention involves setting the sampling cylinder to move downwards, and when the lifting rod moves downwards relative to the sampling cylinder, the lifting rod will drive the movable plug to move downwards, increasing the longitudinal distance between the movable plug and the fixed plug. This creates a negative pressure between the movable plug, the fixed plug, and the inner wall of the sampling cylinder. When the sampling cylinder moves to its lower position, the float plate is also pushed up by the soil, causing the float plate to move upwards relative to the sampling cylinder. When it moves upwards, the sealing block moves upwards within the installation cavity, causing the sealing state of the sealing block against the water inlet to disappear. This allows groundwater seeping from the filter holes between the gathering claws to enter the installation cavity through the water inlet. Due to the negative pressure in the space between the fixed plug and the movable plug, the seeping groundwater will enter the connecting port through the suction hole under the action of negative pressure and enter the space between the fixed plug and the movable plug for storage. In this way, after the sampling cylinder is inserted into the soil to a certain depth, the gathering claws squeeze the soil, causing groundwater to seep into the space between the gathering claws, thus completing the collection of groundwater. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a soil and groundwater detection and sampling device according to the present invention; Figure 2 for Figure 1 Cross-sectional view of the middle structure; Figure 3 for Figure 1 A schematic diagram of the structure omitting the support and sampling tube; Figure 4 for Figure 3 Cross-sectional view of the middle structure; Figure 5 for Figure 4 Enlarged schematic diagram of the local structure at point A; Figure 6 for Figure 3 Schematic diagram of the explosive decomposition of the medium structure; Figure 7 This is a schematic diagram of the structure of the lifting rod, the first sliding block, and the second rack after assembly in this invention; Figure 8 for Figure 7Cross-sectional view of the middle structure; Figure 9 for Figure 7 A schematic diagram of the structure viewed from below.

[0019] The following are the annotations for each item in the figure: 1. Base; 2. Gathering claw; 3. Filter hole; 4. Sampling cylinder; 5. Baffle; 6. Mounting bracket; 7. Return spring; 8. End cap; 9. Lifting cylinder; 10. Second rack; 11. Gear; 12. Lifting rod; 13. Movable plug; 14. Hinge rod; 15. Suction hole; 16. Fixed plug; 17. Float plate; 18. Connecting port; 19. First sliding block; 20. First rack; 21. Second sliding block; 22. Connecting rod; 23. Sliding rod; 24. Sealing block; 25. Mounting cavity; 26. Buffer spring; 27. Water inlet; 28. Connecting column. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 - Figure 9 This invention provides a technical solution: a soil and groundwater testing and sampling device, including a support, the support including a base 1 and a mounting frame 6, the vertical section of the mounting frame 6 is welded to the base 1, a lifting cylinder 9 is vertically installed on its horizontal section, and a reinforcing rib extending to the base 1 is welded to the vertical section of the mounting frame 6. The cylinder rod of the lifting cylinder 9 is threadedly connected to a sampling cylinder 4. The upper end of the sampling cylinder 4 is closed, the inside is hollow and the lower end is open. The lifting cylinder 9 can drive the sampling cylinder 4 to move up and down. A through hole is opened in the middle of the base 1 for the sampling cylinder 4 to pass through freely. Four converging claws 2 are hinged in an array along the axial direction at the lower end of the sampling cylinder 4. After the four converging claws 2 are combined, their interior is connected to the interior of the sampling cylinder 4. In addition, the lower end of the converging claws 2 is pointed, which makes it easy for the converging claws 2 to be inserted into the soil after being gathered. In addition, multiple filter holes 3 with a diameter of no more than 1 mm are opened on the surface of the converging claws 2. The sampling cylinder 4 has a first sliding block 19 that can slide freely up and down. A lifting rod 12 is welded to the lower end of the first sliding block 19, and the lifting rod 12 is coaxial with the sampling cylinder 4. Four hinge rods 14 are hinged to the lower end of the lifting rod 12, arranged in an array along the axial direction of the lifting rod 12. The end of each hinge rod 14 away from the lifting rod 12 is correspondingly hinged to the inner wall of the gathering claw 2. A baffle 5 that can slide freely up and down is fitted onto the sampling cylinder 4. The outer diameter of the baffle 5 is much larger than the outer diameter of the sampling cylinder 4. A connecting rod 22 is fixedly connected to the annular hole of the baffle 5. The sampling cylinder 4 has an oblong hole for the connecting rod 22 to pass through freely. A connecting column 28 is fixedly connected to the part located inside the sampling cylinder 4. A second sliding block 21 is welded to the lower end of the connecting column 28. The second sliding block 21 can freely pass through the interior of the sampling cylinder 4. A first rack 20 is vertically welded to the lower end face of the second sliding block 21. A second rack 10 is vertically welded to the upper end face of the first sliding block 19. The first rack 20 and the second rack 10 are arranged vertically and vertically. A pivot is horizontally rotatably connected to the inner wall of the sampling cylinder 4. A gear 11 is sleeved on the pivot. The first rack 20 and the second rack 10 mesh with the gear 11, and the first rack 20 and the second rack 10 are located on the radial sides of the gear 11, respectively. During sampling, the base 1 is first moved to the surface of the soil in the sampling area. Then, the lifting cylinder 9 is activated, and the cylinder rod of the lifting cylinder 9 extends, driving the sampling cylinder 4 to move downwards. The squeezing action of the pointed ends of the gathering claws 2 allows the gathering claws 2 and the sampling cylinder 4 to be inserted into the soil. After insertion to a fixed depth, the baffle 5 will contact the ground surface. At this point, as the sampling cylinder 4 continues to be inserted, the baffle 5 is blocked by the ground surface and cannot move further with the sampling cylinder 4. The baffle 5 then moves upwards relative to the sampling cylinder 4, causing the connecting rod 22, connecting column 28, and second sliding block 21 to move upwards relative to the sampling cylinder 4. During this upward movement, the connecting rod 22, connecting column 28, and second sliding block 21 move upwards relative to the sampling cylinder 4. A rack 20 meshes with a gear 11. When meshing, the gear 11 rotates. Since the gear 11 meshes with the second rack 10, the second rack 10 drives the lifting rod 12 to move downward. When the lifting rod 12 moves downward, it will cause the hinge rod 14 to push the gathering claw 2 to flip along the hinge with the sampling cylinder 4. The flipping direction is towards the radial outside of the sampling cylinder 4, so that the four gathering claws 2 are in an unfolded state. During the unfolding process, the gathering claws 2 will create a squeezing pit in the soil. At the same time, the gathering claws 2 will squeeze the soil around the squeezing pit. During the squeezing, the groundwater in the soil will seep into the space between the gathering claws 2 through the filter hole 3 under greater pressure. Additionally, an end cap 8 is fitted onto the upper end of the sampling cylinder 4, and a return spring 7 is wound around the sampling cylinder 4. The two ends of the return spring 7 elastically abut against the end cap 8 and the baffle 5 respectively. In the initial state, the return spring 7 is in a partially compressed state, which causes the return spring 7 to generate a downward elastic resisting force on the baffle 5 in the initial state. This causes the baffle 5 to drive the first rack 20 to move downward in the initial state. Then, through the meshing of the first rack 20 with the gear 11 and the meshing of the gear 11 with the second rack 10, the lifting rod 12 drives the hinge rod 14 to move upward, and causes the four gathering claws 2 to be in a retracted state. During the insertion of the soil, since the four gathering claws 2 are in a retracted state, the resistance of the soil on the gathering claws 2 during the insertion process will not cause the gathering claws 2 to unfold.

[0022] A fixed plug 16 is fixedly engaged inside the sampling cylinder 4, located below the first sliding block 19. A movable plug 13, which can slide freely up and down, is also engaged inside the sampling cylinder 4, located below the fixed plug 16. The movable plug 13 is sleeved on the lifting rod 12 and moves up and down with the lifting rod 12. When the lifting rod 12 moves downward relative to the sampling cylinder 4, the movable plug 13 will move away from the fixed plug 16, creating a longitudinal gap between the fixed plug 16 and the movable plug 13. The space between the fixed plug 16 and the movable plug 13 is defined as the liquid storage space. A water suction hole 15 is coaxially opened inside the lifting rod 12, penetrating the lower end face of the lifting rod 12. A communication port 18, which communicates with the water suction hole 15, is opened at the upper end of the lifting rod 12. A collection port (not shown in the figure) is provided on the outer wall of the sampling cylinder 4, located between the fixed plug 16 and the movable plug 13. A sliding rod 2, which can slide freely up and down, is coaxially inserted through the lower end of the lifting rod 12. 3. A float plate 17 is welded to one end of the sliding rod 23 extending between the four converging claws 2, and a sealing block 24 with a circular cross-section is welded to the other end of the sliding rod 23. An installation cavity 25 is provided inside the sampling cylinder 4 for the sealing block 24 to pass through freely. The installation cavity 25 is connected to the water suction hole 15 and its inner diameter is larger than the outer diameter of the sealing block 24. Three through-hole-shaped water inlets 27 are provided on the lower end face of the sampling cylinder 4. The orthographic projection area of ​​the sealing block 24 covers the water inlets 27. Preferably, the water inlets 27 are arranged in an array along the axial direction of the sampling cylinder 4, that is, the three water inlets 27 are distributed in a ring. A buffer spring 26 is vertically installed inside the installation cavity 25. The two ends of the buffer spring 26 elastically abut against the inner top wall of the installation cavity 25 and the sealing block 24 respectively. The surface of the sealing block 24 is provided with a rubber layer (not shown in the figure). This allows the water inlets 27 to be sealed well when the lower end face of the sealing block 24 contacts the inner bottom wall of the installation cavity 25. During the insertion of the sampling cylinder 4 into the soil, until the baffle 5 contacts the ground surface, as the sampling cylinder 4 continues to be inserted, the baffle 5 moves upward relative to the sampling cylinder 4, thereby driving the lifting rod 12 to move downward. The lifting rod 12 will drive the movable plug 13 to move downward relative to the sampling cylinder 4, creating a large gap between the movable plug 13 and the fixed plug 16, forming a liquid storage space. In addition, due to the elastic abutment of the buffer spring 26 against the sealing block 24, the sealing block 24 seals the water inlet 27, thereby creating a negative pressure state inside the liquid storage space. The gathering claw 2 compresses the soil. When the soil is compacted, groundwater will enter between the collecting claws 2. After the sampling tube 4 moves downwards into position, the float 17 will contact the bottom of the squeezing pit. In addition, the groundwater level in the squeezing pit should be higher than the lower end of the lifting rod 12. At the same time, the bottom of the pit pushes the float 17 upwards, causing the float 17 to drive the sliding rod 23 upwards, and causing the sealing block 24 to move away from the inlet 27. At this time, the opening of the inlet 27 is open. Under the negative pressure in the liquid storage space, groundwater will be drawn from the inlet 27 into the installation cavity 25, and then from the gap between the sealing block 24 and the inner wall of the installation cavity 25. The sample enters the suction hole 15, is then sucked into the connecting port 18, and enters the storage space for storage. Then, the cylinder rod of the lifting cylinder 9 shortens, causing the sampling cylinder 4 to move upwards. Meanwhile, the baffle 5 is elastically resisted by the return spring 7, causing the baffle 5 to move downwards relative to the sampling cylinder 4. This causes the lifting rod 12 to move upwards relative to the sampling cylinder 4, and the four hinge rods 14 to drive the four gathering claws 2 to retract to a certain state. Simultaneously, the float 17 moves away from the bottom of the squeezing pit, causing the buffer spring 26 to elastically resist the sealing block 24, thus sealing the block. At the inlet 27, because the liquid storage space contains groundwater, the movable plug 13 cannot abut against the end face of the fixed plug 16. After the soil is extracted, the sampling tube 4 opens the collection port to collect the groundwater in the liquid storage space between the fixed plug 16 and the movable plug 13. After collection, the return spring 7 has an elastic resisting force on the baffle 5. When the groundwater in the liquid storage space is discharged from the collection port, the movable plug 13 will gradually approach the fixed plug 16 until the end face of the movable plug 13 abuts against the end face of the fixed plug 16, and at the same time, the four gathering claws 2 will retract into each other.

[0023] The working principle of this invention is as follows: During sampling, the base 1 is first moved to the surface of the soil in the sampling area. Then, the lifting cylinder 9 is activated, and the cylinder rod of the lifting cylinder 9 extends, driving the sampling cylinder 4 to move downwards. The squeezing action of the pointed ends of the gathering claws 2 allows the gathering claws 2 and the sampling cylinder 4 to be inserted into the soil. After insertion to a fixed depth, the baffle 5 will contact the ground surface. At this point, as the sampling cylinder 4 continues to be inserted, the baffle 5 is blocked by the ground surface and cannot move further with the sampling cylinder 4. At this time, the baffle 5 and the sampling cylinder 4 move relative to each other, and the baffle 5 approaches the top of the sampling cylinder 4. This causes the baffle 5 to drive the connecting rod 22, the connecting column 28, and the second sliding block 21 to move relative to the sampling cylinder 4, towards... When moving upwards, the first rack 20 meshes with the gear 11. When meshing, the gear 11 rotates, which in turn meshes with the second rack 10. The second rack 10 drives the lifting rod 12 to move downwards. When the lifting rod 12 moves downwards, the hinge rod 14 pushes the gathering claw 2 to flip along the hinge point with the sampling cylinder 4. The flipping direction is towards the radial outside of the sampling cylinder 4, so that the four gathering claws 2 are in an unfolded state. During the unfolding process, the gathering claws 2 will create a squeezing pit inside the soil. At the same time, the gathering claws 2 will squeeze the soil around the squeezing pit. During the squeezing, the groundwater in the soil will seep into the space between the gathering claws 2 under greater pressure through the water filter holes 3. During the insertion of the sampling cylinder 4 into the soil, until the baffle 5 contacts the ground surface, as the sampling cylinder 4 continues to be inserted, the baffle 5 moves upward relative to the sampling cylinder 4, thereby driving the lifting rod 12 to move downward. The lifting rod 12 will drive the movable plug 13 to move downward relative to the sampling cylinder 4, creating a large gap between the movable plug 13 and the fixed plug 16, forming a liquid storage space. In addition, due to the elastic abutment of the buffer spring 26 against the sealing block 24, the sealing block 24 seals the water inlet 27, thus creating a negative pressure state inside the liquid storage space. When the collecting claw 2 squeezes the soil, the groundwater in the soil will enter the collecting claw. Between 2, when the sampling tube 4 moves downward into place, the float 17 will contact the bottom of the squeezing pit. In addition, the water level of the groundwater in the squeezing pit is higher than the lower end face of the lifting rod 12. At the same time, the bottom of the pit pushes the float 17 upward, so that the float 17 drives the sliding rod 23 to move upward, and makes the sealing block 24 move away from the water inlet 27. At this time, the opening of the water inlet 27 is open. Under the negative pressure in the liquid storage space, the groundwater will be sucked into the installation cavity 25 from the water inlet 27, and then enter the water suction hole 15 from the gap between the sealing block 24 and the inner wall of the installation cavity 25. Then it will be sucked into the connecting port 18 and enter the liquid storage space for storage. Then, the cylinder rod of the lifting cylinder 9 shortens, causing the sampling cylinder 4 to move upward. Meanwhile, the baffle 5 is elastically resisted by the return spring 7, causing the baffle 5 to move downward relative to the sampling cylinder 4. This, in turn, causes the lifting rod 12 to move upward relative to the sampling cylinder 4, and the four hinge rods 14 to drive the four gathering claws 2 to retract to a certain state. Simultaneously, the float 17 moves away from the bottom of the squeezing pit, causing the buffer spring 26 to elastically resist the sealing block 24, thus sealing the water inlet 27. At this point, because groundwater is stored in the liquid storage space, the movable plug 13 cannot abut against the end face of the fixed plug 16. After the soil is extracted, the sampling tube 4 opens the collection port to collect the groundwater in the liquid storage space between the fixed plug 16 and the movable plug 13. After collection, the return spring 7 has an elastic resisting force on the baffle 5. When the groundwater in the liquid storage space is discharged from the collection port, the movable plug 13 will gradually approach the fixed plug 16 until the end face of the movable plug 13 abuts against the end face of the fixed plug 16, and at the same time, the four gathering claws 2 will close together. Furthermore, a plug can be installed on the collection port. Rotating the plug can seal the collection port, and rotating the plug in the opposite direction can open the collection port.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil and groundwater testing and sampling device, characterized in that, include: support; The sampling cylinder (4) is driven to move up and down by a lifting cylinder (9) installed on the bracket. The sampling cylinder (4) is hollow inside and open at the bottom. Multiple gathering claws (2) with filter holes (3) on their surfaces are arranged in an array and hinged to the lower end of the sampling cylinder (4) along the axial direction of the sampling cylinder (4), and the multiple gathering claws (2) close the opening of the sampling cylinder (4) after they are closed. An unfolding mechanism is provided on the sampling cylinder (4), which is used to drive multiple gathering claws (2) to unfold or retract synchronously; A sampling mechanism is provided on the sampling cylinder (4), which is used to complete the water absorption sampling action after the multiple gathering claws (2) are unfolded; The deployment mechanism includes: The first sliding block (19) is engaged inside the sampling cylinder (4) and can slide freely up and down; The lifting rod (12) is fixed to the lower end face of the first sliding block (19) and is coaxial with the sampling cylinder (4); Multiple hinge rods (14) are arranged in an array along the axial direction of the lifting rod (12) and hinged to the lower end of the lifting rod (12). The end of the hinge rod (14) away from the lifting rod (12) is correspondingly hinged to the inner wall of the gathering claw (2). A lifting device is used to drive the first sliding block (19) to move vertically; The lifting device includes: A baffle (5) is fitted onto the sampling cylinder (4) and slides freely up and down. A connecting rod (22) is fixedly connected to the annular hole of the baffle (5). The sampling cylinder (4) has an oblong hole for the connecting rod (22) to pass through freely. A connecting column (28) is fixedly connected to the part of the connecting rod (22) located inside the sampling cylinder (4). The second sliding block (21) is fixed to the lower end of the connecting post (28); The first rack (20) is fixed to the lower end face of the second sliding block (21); The second rack (10) is fixed to the upper end face of the first sliding block (19); Gear (11), the gear (11) is pivotally connected to the sampling cylinder (4), the first rack (20) and the second rack (10) mesh with the gear (11), and the first rack (20) and the second rack (10) are respectively located on the radial sides of the gear (11); The sampling mechanism includes: A fixing plug (16) is fixedly engaged inside the sampling cylinder (4), and the fixing plug (16) is located below the first sliding block (19); The movable plug (13) is engaged in the sampling cylinder (4) and can slide freely up and down. The movable plug (13) is located below the fixed plug (16). The movable plug (13) is sleeved on the lifting rod (12) and moves up and down with the lifting rod (12). A water suction hole (15) is coaxially opened inside the lifting rod (12) and penetrates the lower end face of the lifting rod (12). The upper end of the lifting rod (12) is provided with a communication port (18) that communicates with the water suction hole (15). A sealing device is connected to the lower end of the lifting rod (12), and after the lifting rod (12) moves down to the position, the lower opening of the water suction hole (15) is opened; The sealing device includes: A sliding rod (23) is coaxially inserted through the lower end of the lifting rod (12) and slides freely on the lifting rod (12); A float plate (17) is fixed to one end of the sliding rod (23) extending between the plurality of gathering claws (2); A sealing block (24) is fixed to the other end of the sliding rod (23). The sampling tube (4) has an installation cavity (25) for the sealing block (24) to pass through freely. The installation cavity (25) is connected to the water suction hole (15) and its inner diameter is larger than the outer diameter of the sealing block (24). The lower end face of the sampling tube (4) has multiple through-hole-shaped water inlets (27). The orthographic projection area of ​​the sealing block (24) covers the water inlets (27).

2. The soil and groundwater testing and sampling device according to claim 1, characterized in that, The support includes: The base (1) has a perforation in the middle for the sampling tube (4) to pass through freely; Mounting bracket (6), which is fixed to the base (1), and lifting cylinder (9) is vertically installed on the horizontal section of the mounting bracket (6).

3. The soil and groundwater testing and sampling device according to claim 1, characterized in that, The sampling tube (4) is fitted with an end cap (8) at its upper end, and a reset spring (7) is wound around the sampling tube (4). The reset spring (7) elastically abuts against the end cap (8) and the baffle (5) at both ends in the direction of its elastic force.

4. The soil and groundwater testing and sampling device according to claim 1, characterized in that, The inlet (27) is arranged in an array along the axial direction of the sampling tube (4).

5. The soil and groundwater testing and sampling device according to claim 1, characterized in that, A buffer spring (26) is vertically installed inside the mounting cavity (25). The two ends of the buffer spring (26) elastically abut against the top wall inside the mounting cavity (25) and the sealing block (24) respectively.

6. A soil and groundwater testing and sampling device according to any one of claims 1, 4, and 5, characterized in that, The sealing block (24) has a rubber layer on its surface.

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