Negative pressure type soil pore water collecting device

Abstract

The application discloses a negative pressure type soil pore water collecting device and particularly relates to the field of pore water collection, which comprises an outer cylinder, the inside of the outer cylinder is provided with a collecting assembly, the collecting assembly comprises a group of water guide holes which are arranged on the outer side of the outer cylinder, and the inside of the water guide hole is embedded with a filter membrane; the outer side of the filter membrane is provided with an opening and closing mechanism, and the opening and closing mechanism comprises an arc-shaped groove which is arranged in the inside of the water guide hole. A motor is started through an external power supply, the output end of the motor drives gear one to rotate, and the rotation of the rotating ring is realized through the transmission of gear one and the arc-shaped toothed plate one in a clockwise direction, so that the arc-shaped plate is synchronously moved through the connecting block until the through hole of the arc-shaped plate corresponds to the position of the water guide hole, and the filter membrane is completely exposed; similarly, after the collection is completed, the arc-shaped plate is returned to the original position to cover the water guide hole through the reverse rotation of the motor output end, the filter membrane can be protected, and the effect of protecting the filter membrane when not in use is achieved.

Description

Technical Field

[0001] This invention relates to the field of pore water collection technology, specifically a negative pressure soil pore water collection device. Background Technology

[0002] In fields such as soil environmental monitoring, farmland nutrient transport research, and contaminated site risk assessment, soil pore water serves as a core carrier reflecting soil physicochemical properties and the state of pollutant accumulation. The accuracy and reliability of its in-situ collection directly determine the scientific validity of the research data. Negative pressure soil pore water sampling devices are currently the mainstream in-situ sampling equipment. Their core principle is to filter soil pore water through a filter membrane to remove impurities such as soil particles and microorganisms, thereby obtaining pure pore water samples. The filter membrane, as a key filtration component, is typically embedded inside the water inlet of the device's outer cylinder, directly contacting the soil environment to complete the sampling process.

[0003] However, existing negative pressure soil pore water sampling devices have significant drawbacks in terms of filter membrane protection: Since the filter membranes are mostly made of PVDF, ceramics, etc., their physical strength is low and their texture is fragile. During device transportation, carrying, and field deployment, the lack of effective protective structures makes the filter membrane susceptible to surface scratches and damage from impacts by hard objects and scraping by soil particles, leading to filtration failure and the introduction of soil particles into the collected water sample, thus compromising its purity. Furthermore, when not in use, dust and impurities in the air easily adhere to the filter membrane surface, clogging the pores, reducing water permeability during sampling, and even causing sampling failure. Therefore, the inventors have provided a negative pressure soil pore water sampling device to solve the problems mentioned in the background section. Summary of the Invention

[0004] The purpose of this invention is to provide a negative pressure soil pore water collection device to achieve a protective effect when the filter membrane is not in use.

[0005] The objective of this invention can be achieved through the following technical solutions: A negative pressure soil pore water collection device includes an outer cylinder, inside which a collection component is disposed. The collection component includes a set of water inlet holes on the outer side of the outer cylinder, and a filter membrane is embedded and fixed inside the water inlet holes. An opening and closing mechanism is disposed on the outer side of the filter membrane. The opening and closing mechanism includes an arc-shaped groove inside the water inlet holes. An exposure groove is provided on the inner side of the arc-shaped groove. An arc-shaped plate that can slide along the inner side of the arc-shaped groove is slidably connected inside the arc-shaped groove. A through hole that penetrates the surface of the arc-shaped plate and is adapted to the size of the water inlet holes is provided on the outer side of the arc-shaped plate.

[0006] As a further embodiment of the present invention: an annular guide rail is fixedly connected to the inner wall of the outer cylinder, a rotating ring is rotatably connected inside the annular guide rail, a set of connecting blocks is fixedly connected to the inner side of the rotating ring, and the bottom of the connecting blocks is fixedly connected to the inner side of the corresponding arc-shaped plate; a motor is fixedly connected to the front side of the inner cavity of the outer cylinder, a gear is fixedly connected to the output end of the motor, an arc-shaped toothed plate is meshed with the front side of the gear, and the arc-shaped toothed plate is fixedly connected to the rotating ring.

[0007] As a further embodiment of the present invention: the collection component also includes a negative pressure generator fixedly installed on the top of the outer cylinder. The outer cylinder is provided with a collection bottle, a water inlet pipe and a suction head arranged sequentially from top to bottom. The bottom of the water inlet pipe is fixedly connected to the suction head, and the outer side of the suction head is fixedly connected to the inner wall of the outer cylinder through a fastener.

[0008] As a further aspect of the present invention: an openable operating door is fixedly installed on the front of the outer cylinder, and the operating door corresponds to the position of the collection bottle; connecting pipes are fixedly connected to the upper and lower sides of the collection bottle, a one-way valve is installed on the outside of the lower connecting pipe, and a manual valve is installed on the outside of the upper connecting pipe; and plugs are installed at the ends of the two connecting pipes; a folded pipe is fixedly connected to the input end of the negative pressure generator and the top of the water inlet pipe, and a pipe joint is fixedly installed at the end of the folded pipe near the collection bottle.

[0009] As a further embodiment of the present invention: a docking mechanism is provided inside the outer cylinder, the docking mechanism including a support base for supporting the collection bottle, the top of the support base having a U-shaped notch, a pair of fixing rods fixedly connected to the rear side of the support base, the rear side of the fixing rods being fixedly connected to the inner wall of the outer cylinder; a rear block is fixedly connected to the top of the support base, the front side of the rear block having an arc design adapted to the surface of the collection bottle; a fixing box is fixedly connected to the right side inside the outer cylinder, the fixing box being hollow inside and open on the left side; a rotatable bidirectional threaded rod is rotatably connected to the upper and lower sides inside the fixing box, a pair of vertically arranged moving blocks are threadedly connected to the outer side of the bidirectional threaded rod, the left end of the upper moving block is fixedly connected to the outer side of the upper folded tube, and the left end of the lower moving block is fixedly connected to the outer side of the lower folded tube.

[0010] As a further embodiment of the present invention: a guide block is fixedly connected to the inside right side of the fixed box, and the guide block is slidably connected to two moving blocks.

[0011] As a further embodiment of the present invention: a rotating rod is fixedly connected to the bottom of the bidirectional threaded rod, a gear two is fixedly connected to the bottom of the rotating rod, an arc-shaped toothed plate two meshes with the outer side of the gear two, and the outer side of the arc-shaped toothed plate two is fixedly connected to the rotating ring.

[0012] As a further embodiment of the present invention: a positioning mechanism is provided on the rear side of the support base. The positioning mechanism includes a pair of mirror-symmetrical fixed frames fixedly connected to the left and right sides of the rear block. The fixed frames are rotatably connected to clamps via rotating rods. The front side of the clamps is an arc-shaped segment adapted to the surface of the collection bottle. A slide rail is fixedly connected to the rear side of the inner side of the outer cylinder. A slider that can move back and forth is slidably connected to the bottom of the slide rail. A connecting frame is fixedly connected to the front side of the slider. A pair of waist holes arranged left and right are opened on the top of the connecting frame. The rear ends of the pair of clamps are located inside the connecting frame, and a driving rod is rotatably connected to the top of the rear ends of the clamps. The driving rod is slidably connected to the corresponding waist hole.

[0013] As a further embodiment of the present invention: a connecting plate is fixedly connected to the inner rear side of the rotating ring, a path groove is provided on the top of the connecting plate, a sliding rod is slidably connected inside the path groove, and the top of the sliding rod is fixedly connected to the slider.

[0014] As a further aspect of the present invention: the path groove is composed of a connected arc segment and an inclined segment, wherein the shape of the arc segment is adapted to the rotation path of the rotating ring; and the inclined segment is designed to gradually move forward from left to right.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This negative pressure soil pore water collection device starts the motor with an external power supply. The motor output drives gear one to rotate, and through the transmission between gear one and arc-shaped toothed plate one, the rotating ring rotates clockwise. This, in turn, drives the arc-shaped plate to move synchronously through the connecting block until the through hole of the arc-shaped plate aligns with the water inlet hole, thus fully exposing the filter membrane. Similarly, after the collection is completed, the motor output reverses to return the arc-shaped plate to its original position and cover the water inlet hole, protecting the filter membrane. This achieves the effect of protecting the filter membrane when not in use. 2. In addition, this negative pressure soil pore water collection device starts the negative pressure generator through an external power supply. The negative pressure generator draws air out of the collection bottle, so that a stable negative pressure is formed inside the collection bottle, the water inlet pipe and the suction head. This negative pressure acts on the surrounding soil through the filter membrane. Under the pressure difference, the soil pore water passes through the filter membrane (filtering soil particles, microorganisms and other impurities) into the suction head, and then flows into the collection bottle through the water inlet pipe, thereby achieving the effect of collecting soil pore water. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of a negative pressure soil pore water collection device; Figure 2 A schematic diagram of the cross-sectional structure of the outer cylinder in a negative pressure soil pore water collection device; Figure 3 A schematic diagram of the internal structure of the outer cylinder in a negative pressure soil pore water collection device; Figure 4 This is a schematic cross-sectional view of the overall structure of a negative pressure soil pore water collection device. Figure 5 This is a partial schematic diagram of the internal structure of the outer cylinder in a negative pressure soil pore water collection device. Figure 6 This is a schematic diagram of the docking mechanism in a negative pressure soil pore water collection device. Figure 7 This is a schematic diagram of the positioning mechanism in a negative pressure soil pore water collection device.

[0017] In the diagram: 10. Outer cylinder; 11. Operating door; 12. Negative pressure generator; 13. Collection bottle; 131. One-way valve; 132. Manual valve; 14. Water inlet pipe; 15. Suction head; 16. Water inlet hole; 17. Filter membrane; 18. Folded tube; 20. Opening and closing mechanism; 201. Arc-shaped groove; 202. Arc-shaped plate; 203. Exposure groove; 204. Circular guide rail; 205. Rotating ring; 206. Connecting block; 207. Motor; 208. Gear 1; 209. Arc-shaped toothed plate one; 30, docking mechanism; 301, support base; 302, rear block; 303, fixing box; 304, bidirectional threaded rod; 305, moving block; 306, guide block; 307, gear two; 308, arc-shaped toothed plate two; 40, positioning mechanism; 401, slide rail; 402, slider; 403, connecting frame; 404, waist hole; 405, clamping plate; 406, fixing frame; 407, connecting plate; 408, path groove; 409, sliding rod. Detailed Implementation

[0018] like Figures 1-4 As shown, a negative pressure soil pore water collection device includes an outer cylinder 10. A collection component is installed inside the outer cylinder 10. The collection component includes a negative pressure generator 12 fixedly installed on the top of the outer cylinder 10. From top to bottom, a collection bottle 13, a water inlet pipe 14, and a suction head 15 are arranged inside the outer cylinder 10. The bottom of the water inlet pipe 14 is fixedly connected to the suction head 15. The outer side of the suction head 15 is fixedly connected to the inner wall of the outer cylinder 10 by a fastener. A set of water inlet holes 16 are opened on the outer side of the outer cylinder 10. A filter membrane 17 is embedded and fixed inside the water inlet holes 16.

[0019] Preferably, an openable operating door 11 is fixedly installed on the front of the outer cylinder 10, and the operating door 11 corresponds to the position of the collection bottle 13; the upper and lower sides of the collection bottle 13 are respectively fixedly connected to connecting pipes, a one-way valve 131 is installed on the outside of the lower connecting pipe (only allowing water sample to flow into the collection bottle 13 from the water inlet pipe 14 to prevent backflow), and a manual valve 132 is installed on the outside of the upper connecting pipe; and plugs are respectively installed at the ends of the two connecting pipes; the input end of the negative pressure generator 12 and the top of the water inlet pipe 14 are respectively fixedly connected to a folded pipe 18 (the folded design is adapted to the displacement during connection, taking into account both sealing and flexibility), and a pipe joint is fixedly installed at the end of the folded pipe 18 near the collection bottle 13.

[0020] Note: The plug and pipe joints are designed for compatibility. The plug and pipe joints adopt a "conical surface + O-ring" sealing structure, which can automatically align and position during insertion and removal. This ensures airtightness after docking (avoiding negative pressure leakage) and matches the automatic drive action of the docking mechanism 30. No manual tightening is required, which meets the design requirements of "quick assembly and disassembly".

[0021] Before collecting soil pore water, first open the operating door 11, place the collection bottle 13 between the two folded tubes 18, then open the manual valve 132, and complete the installation of the collection bottle 13 by connecting it to the pipe joint using a plug-in connector. Then close the operating door 11. Next, use a threaded drilling machine to dig a sampling pit of appropriate depth in the selected ground, then insert the outer cylinder 10 into the pit, and fill the pit with soil to ensure there are no gaps between the outer cylinder 10 and the pit (ensuring that the filter membrane 17 is in close contact with the soil and preventing air from entering through gaps and affecting the negative pressure). During the sampling operation, [the process is as follows:] The negative pressure generator 12 is started by connecting an external power source. The negative pressure generator 12 draws air out of the collection bottle 13, so that a stable negative pressure is formed inside the collection bottle 13, the water inlet pipe 14 and the suction head 15. This negative pressure acts on the surrounding soil through the filter membrane 17. Under the pressure difference, the soil pore water passes through the filter membrane 17 (filtering soil particles, microorganisms and other impurities) and enters the suction head 15. Then it flows into the collection bottle 13 through the water inlet pipe 14, thereby achieving the effect of collecting soil pore water. After collection, the outer cylinder 10 is removed, the operating door 11 is opened to remove the collection bottle 13, and the manual valve 132 is closed.

[0022] Since the filter membrane 17 is relatively fragile, it may be damaged or destroyed by external objects during transportation or carrying if it is not protected, which will affect the collection of soil pore water; therefore, an opening and closing mechanism 20 is proposed.

[0023] refer to Figures 1-5The opening and closing mechanism 20 includes an arc-shaped groove 201 formed inside the water inlet hole 16. An exposure groove 203 is formed on the inner side of the arc-shaped groove 201. An arc-shaped plate 202 that can slide along the inside of the arc-shaped groove 201 is slidably connected inside the arc-shaped groove 201. A through hole that penetrates the surface of the arc-shaped plate 202 and is adapted to the size of the water inlet hole 16 is formed on the outer side of the arc-shaped plate 202.

[0024] Specifically, an annular guide rail 204 is fixedly connected to the inner wall of the outer cylinder 10, and a rotating ring 205 is rotatably connected inside the annular guide rail 204. A set of connecting blocks 206 is fixedly connected to the inner side of the rotating ring 205, and the bottom of the connecting blocks 206 is fixedly connected to the inner side of the corresponding arc-shaped plate 202. A motor 207 is fixedly connected to the front side of the inner side of the outer cylinder 10, and a gear 208 is fixedly connected to the output end of the motor 207. An arc-shaped toothed plate 209 meshes with the front side of the gear 208, and the arc-shaped toothed plate 209 is fixedly connected to the rotating ring 205.

[0025] When the collection device is not in use, the arc-shaped plate 202 covers the water inlet hole 16 to prevent foreign objects from impacting and damaging the filter membrane 17. When in use, the motor 207 is started by an external power supply. The output end of the motor 207 drives the gear 208 to rotate, and through the transmission between the gear 208 and the arc-shaped toothed plate 209, the rotating ring 205 rotates clockwise. This causes the arc-shaped plate 202 to move synchronously through the connecting block 206 until the through hole of the arc-shaped plate 202 corresponds to the position of the water inlet hole 16, so that the filter membrane 17 is fully exposed. Similarly, after the collection is completed, the output end of the motor 207 is reversed to return the arc-shaped plate 202 to its original position to cover the water inlet hole 16, thus protecting the filter membrane 17.

[0026] Since the opening of the operating door 11 is relatively narrow, it is inconvenient to install and remove the collection bottle 13 inside through the operating door 11. Therefore, a docking mechanism 30 is proposed.

[0027] refer to Figures 1-7The docking mechanism 30 includes a support base 301 that supports the collection bottle 13. The top of the support base 301 has a U-shaped notch. A pair of fixing rods are fixedly connected to the rear side of the support base 301, and the rear side of the fixing rods is fixedly connected to the inner wall of the outer cylinder 10. A rear block 302 is fixedly connected to the top of the support base 301. The front side of the rear block 302 is an arc-shaped design adapted to the surface of the collection bottle 13 (to improve the positioning stability of the collection bottle 13). A fixing box 303 is fixedly connected to the right side of the inner cavity of the outer cylinder 10. The fixing box 303 is hollow inside and open on the left side. A rotatable bidirectional threaded rod 304 is rotatably connected to the upper and lower sides of the fixing box 303. A pair of vertically arranged moving blocks 305 are threadedly connected to the outer side of the bidirectional threaded rod 304. The left end of the upper moving block 305 is fixedly connected to the outer side of the upper folding tube 18, and the left end of the lower moving block 305 is fixedly connected to the outer side of the lower folding tube 18.

[0028] Preferably, a guide block 306 is fixedly connected to the inside right side of the fixed box 303, and the guide block 306 is slidably connected to two moving blocks 305; thereby achieving the effect of guiding and limiting the sliding of the moving blocks 305, and avoiding misalignment caused by the displacement of the moving blocks 305.

[0029] Specifically, a rotating rod is fixedly connected to the bottom of the bidirectional threaded rod 304, and a gear 307 is fixedly connected to the bottom of the rotating rod. An arc-shaped toothed plate 308 meshes with the outer side of the gear 307, and the outer side of the arc-shaped toothed plate 308 is fixedly connected to the rotating ring 205.

[0030] In use, open the operating door 11 and place the collection bottle 13 on top of the support base 301; then close the operating door 11 and expose the filter membrane 17 through the opening and closing mechanism 20; during the opening and closing mechanism 20's opening action, the rotating ring 205 rotates clockwise, which drives the arc-shaped toothed plate 308 to rotate in the same direction, thereby driving the gear 307 to rotate through the transmission between the arc-shaped toothed plate 308 and the gear 307, which in turn drives the bidirectional threaded rod 304 to rotate, causing the two moving blocks 305 to move towards each other, precisely aligning the connectors on the two folded tubes 18 with the corresponding connecting pipes of the collection bottle 13. The exposure of the filter membrane 17 and the installation of the collection bottle 13 are both necessary operations before using the collection device. The rotation of the rotating ring 205 enables both operations to proceed simultaneously, reducing cumbersome installation steps and improving operational efficiency.

[0031] After collection is completed, the outer cylinder 10 is removed, and the opening and closing mechanism 20 performs a closing action; the rotating ring 205 rotates counterclockwise to return to its original position; the rotating ring 205 drives the arc-shaped toothed plate 308 to rotate in the same direction, thereby causing the gear 307 and the bidirectional threaded rod 304 to rotate in opposite directions through the transmission between the arc-shaped toothed plate 308 and the gear 307, which in turn causes the two moving blocks 305 to move in opposite directions, thereby causing the joints of the two folded tubes 18 to separate from the connecting pipe joints of the collection bottle 13; then the operating door 11 can be opened to take out the disassembled collection bottle 13.

[0032] Supplement: The effect of disassembling the collection bottle 13 and protecting the filter membrane 17 simultaneously: This design achieves a linkage between disassembly and protection actions, with three core benefits: 1. Simplified operation process: No need to perform the separate steps of "disassembling the collection bottle" and "closing the filter membrane protection," allowing a single person to complete the task quickly and reducing the complexity of field operations; 2. Prevention of human error in omitting protection: Preventing the arc plate 202 from being forgotten to close after collection, which could cause the filter membrane 17 to be scratched by soil particles or hard objects during transfer; 3. Reduced risk of water sample contamination: The collection bottle 13 can be removed immediately after being separated from the pipeline, without waiting for the filter membrane protection action, shortening the exposure time of the water sample in the device, especially protecting the integrity of sensitive water samples that are easily oxidized or contain trace pollutants.

[0033] refer to Figures 1-7 A positioning mechanism 40 is provided on the rear side of the support base 301. The positioning mechanism 40 includes a pair of mirror-symmetrical fixed frames 406 fixedly connected to the left and right sides of the rear block 302. The inside of the fixed frame 406 is rotatably connected to a clamping plate 405 via a rotating rod. The front side of the clamping plate 405 is an arc-shaped section adapted to the surface of the collection bottle 13 (to improve clamping stability and avoid damage to the collection bottle 13). The rear side of the inner side of the outer cylinder 10 is fixedly connected to a slide rail 401. The bottom of the slide rail 401 is slidably connected to a slider 402 that can move back and forth. The front side of the slider 402 is fixedly connected to a connecting frame 403. The top of the connecting frame 403 has a pair of waist holes 404 arranged left and right. The rear ends of the pair of clamping plates 405 are located inside the connecting frame 403, and the top of the rear ends of the clamping plates 405 are rotatably connected to a driving rod, which is slidably connected to the corresponding waist hole 404.

[0034] Specifically, a connecting plate 407 is fixedly connected to the rear side of the inner side of the rotating ring 205. A path groove 408 is provided on the top of the connecting plate 407. A sliding rod 409 is slidably connected inside the path groove 408. The top of the sliding rod 409 is fixedly connected to the slider 402.

[0035] Preferably, the path groove 408 is composed of a connected arc segment and an inclined segment, wherein the shape of the arc segment is adapted to the rotation path of the rotating ring 205 to ensure that the position of the slider 402 is stable when the rotating ring 205 continues to rotate; while the inclined segment is designed to gradually move forward from left to right to realize the forward and backward movement drive of the slider 402.

[0036] When the rotating ring 205 rotates, it drives the connecting plate 407 to rotate synchronously, thereby causing the sliding rod 409 to slide along the inclined section in the path groove 408. This causes the sliding rod 409 to drive the slider 402 to gradually move backward, which in turn drives the connecting frame 403 to move in the same direction. The connecting frame 403 pulls the rear end of the clamping plate 405 backward through the driving rod, causing the driving rod to slide inside the waist hole 404 and drive the clamping plate 405 to rotate inward with the rotating rod in the corresponding fixed frame 406 as the center. This causes the arc-shaped section of the clamping plate 405 to clamp the surface of the collection bottle 13 and cause the rear surface of the collection bottle 13 to fit with the surface of the rear block 302 (achieving precise positioning of the collection bottle 13 and ensuring interface alignment during docking). The sliding rod 409 then slides inside the arc-shaped section, while the position of the slider 402 remains unchanged, thus adapting to the subsequent rotation of the rotating ring 205. Before collection, the rotating ring 205 rotates to first position and clamp the collection bottle 13, and then connect the collection bottle 13 to the pipeline. After collection, the rotating ring 205 reverses to first disassemble the collection bottle 13 from the pipeline, and then release the clamp on the collection bottle 13.

[0037] The "disconnect the pipeline before releasing the clamp" procedure after collection avoids damage to the docking joint due to stress: if the clamp is released first, the collection bottle 13 may experience hard friction and collision between the docking joint and the pipeline joint due to shaking. This sequence ensures that the position of the collection bottle 13 is fixed when the joint is separated, reducing joint wear and extending the service life of the seals; 2. Prevent water sample leakage: When the joint is separated, the collection bottle 13 is in a stable clamped state, avoiding water sample leakage at the joint due to displacement of the collection bottle 13, which could contaminate the inside of the device or the soil environment; 3. Improve the convenience of bottle retrieval: After the pipeline is separated and the clamp is released, the collection bottle 13 is not pulled by the pipeline. It can be directly and smoothly taken out after opening the operating door 11, which is especially suitable for quick bottle retrieval in confined operating spaces in the field.

Claims

1. A negative pressure soil pore water collection device, comprising an outer cylinder (10), wherein a collection component is disposed inside the outer cylinder (10), the collection component comprising a set of water inlet holes (16) opened on the outer side of the outer cylinder (10), wherein a filter membrane (17) is embedded and fixed inside the water inlet holes (16), characterized in that, The filter membrane (17) is provided with an opening and closing mechanism (20) on the outside. The opening and closing mechanism (20) includes an arc-shaped groove (201) opened inside the water inlet (16). An exposure groove (203) is opened on the inner side of the arc-shaped groove (201). An arc-shaped plate (202) that can slide along the inside of the arc-shaped groove (201) is slidably connected inside the arc-shaped groove (201). A through hole that penetrates the surface of the arc-shaped plate (202) and is adapted to the size of the water inlet (16) is opened on the outer side of the arc-shaped plate (202).

2. The negative pressure soil pore water collection device according to claim 1, characterized in that, The inner wall of the outer cylinder (10) is fixedly connected to an annular guide rail (204), and the inside of the annular guide rail (204) is rotatably connected to a rotating ring (205). The inner side of the rotating ring (205) is fixedly connected to a set of connecting blocks (206), and the bottom of the connecting blocks (206) is fixedly connected to the inner side of the corresponding arc plate (202). The front side of the inner wall of the outer cylinder (10) is fixedly connected to a motor (207), and the output end of the motor (207) is fixedly connected to a gear (208). The front side of the gear (208) is meshed with an arc-shaped toothed plate (209), and the arc-shaped toothed plate (209) is fixedly connected to the rotating ring (205).

3. The negative pressure soil pore water collection device according to claim 1, characterized in that, The collection assembly also includes a negative pressure generator (12) fixedly installed on the top of the outer cylinder (10). The outer cylinder (10) is provided with a collection bottle (13), a water pipe (14), and a suction head (15) arranged from top to bottom. The bottom of the water pipe (14) is fixedly connected to the suction head (15), and the outer side of the suction head (15) is fixedly connected to the inner wall of the outer cylinder (10) through a fastener.

4. The negative pressure soil pore water collection device according to claim 3, characterized in that, An openable operating door (11) is fixedly installed on the front of the outer cylinder (10), and the operating door (11) corresponds to the position of the collection bottle (13); The collection bottle (13) is fixedly connected to the upper and lower sides by connecting pipes. A one-way valve (131) is installed on the outside of the lower connecting pipe, and a manual valve (132) is installed on the outside of the upper connecting pipe. The ends of the two connecting pipes are respectively equipped with plugs. The input end of the negative pressure generator (12) and the top of the water pipe (14) are respectively fixedly connected to a folded pipe (18), and a pipe joint is fixedly installed at one end of the folded pipe (18) near the collection bottle (13).

5. The negative pressure soil pore water collection device according to claim 1, characterized in that, The outer cylinder (10) is provided with a docking mechanism (30). The docking mechanism (30) includes a support base (301) for supporting the collection bottle (13). The top of the support base (301) is provided with a U-shaped notch. A pair of fixing rods are fixedly connected to the rear side of the support base (301). The rear side of the fixing rods is fixedly connected to the inner wall of the outer cylinder (10). A rear block (302) is fixedly connected to the top of the support base (301). The front side of the rear block (302) is an arc-shaped design adapted to the surface of the collection bottle (13). A fixed box (303) is fixedly connected to the right side of the inner cavity of the outer cylinder (10). The fixed box (303) is hollow inside and open on the left side. A rotatable bidirectional threaded rod (304) is rotatably connected to the upper and lower sides of the fixed box (303). A pair of vertically arranged moving blocks (305) are threadedly connected to the outer side of the bidirectional threaded rod (304). The left side of the upper moving block (305) is fixedly connected to the outer side of the upper folded tube (18), and the left side of the lower moving block (305) is fixedly connected to the outer side of the lower folded tube (18).

6. The negative pressure soil pore water collection device according to claim 5, characterized in that, A guide block (306) is fixedly connected to the inside right side of the fixed box (303), and the guide block (306) is slidably connected to two moving blocks (305).

7. A negative pressure soil pore water collection device according to claim 5, characterized in that, The bottom of the bidirectional threaded rod (304) is fixedly connected to a rotating rod, and the bottom of the rotating rod is fixedly connected to a gear two (307). The outer side of the gear two (307) is meshed with an arc-shaped toothed plate two (308), and the outer side of the arc-shaped toothed plate two (308) is fixedly connected to a rotating ring (205).

8. A negative pressure soil pore water collection device according to claim 7, characterized in that, The support base (301) is provided with a positioning mechanism (40) on the rear side. The positioning mechanism (40) includes a pair of mirror-symmetrical fixed frames (406) fixedly connected to the left and right sides of the rear block (302). The fixed frame (406) is rotatably connected to a clamp (405) through a rotating rod. The front side of the clamp (405) is an arc-shaped section adapted to the surface of the collection bottle (13). The inner rear side of the outer cylinder (10) is fixedly connected to a slide rail (401). The bottom of the slide rail (401) is slidably connected to a slider (402) that can move back and forth. The front side of the slider (402) is fixedly connected to a connecting frame (403). The top of the connecting frame (403) is provided with a pair of waist holes (404) arranged on the left and right. The rear ends of the pair of clamps (405) are located inside the connecting frame (403), and the top of the rear ends of the clamps (405) are rotatably connected to a driving rod. The driving rod is slidably connected to the corresponding waist hole (404).

9. A negative pressure soil pore water collection device according to claim 8, characterized in that, A connecting plate (407) is fixedly connected to the rear side of the inner side of the rotating ring (205). A path groove (408) is provided on the top of the connecting plate (407). A sliding rod (409) is slidably connected inside the path groove (408). The top of the sliding rod (409) is fixedly connected to the slider (402).

10. A negative pressure soil pore water collection device according to claim 9, characterized in that, The path groove (408) consists of a connected arc segment and an inclined segment, wherein the shape of the arc segment is adapted to the rotation path of the rotating ring (205); and the inclined segment is designed to move forward gradually from left to right.

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