Quantitative sampling device for water quality analysis

Abstract

The invention provides a quantitative sampling device for water quality analysis, and belongs to the technical field of water quality analysis. Comprising a chassis, a fixing frame is fixedly connected to the chassis, electric telescopic rods are symmetrically installed on the top of the fixing frame, servo motors are fixedly connected to the bottom ends of the movable ends of the electric telescopic rods, first gears are fixedly connected to the tail ends of driving shafts of the servo motors, and movable frames are rotationally connected to the bottom ends of the first gears through connecting rods and bearing seats; the bottom end of the movable frame is fixedly connected with an abutting frame, and positioning seats which are evenly distributed are fixedly installed on the chassis. By arranging the first gear capable of ascending and descending, the connecting rod and the abutting frame, when the first gear is pressed downwards and meshed with the second gear with different heights, the abutting frame synchronously presses the corresponding C-shaped area downwards, so that the movable rod deforms in the weakening area, the sealing head is driven to be separated from the water pipe, linkage control over the sealing assembly and the extraction assembly is achieved, and the sealing efficiency is improved. Accurate opening, closing and isolation of the sampling channel are ensured when water samples at different depths are collected.

Description

Technical Field

[0001] This invention relates to the field of water quality analysis technology, and in particular to a quantitative sampling device for water quality analysis. Background Technology

[0002] Water quality analysis is a crucial link in fields such as environmental monitoring, hydrogeology, aquaculture, and industrial production. Its accuracy directly depends on the representativeness of the collected water samples. In practical applications, especially for heterogeneous water bodies such as lakes, reservoirs, rivers, oceans, and deep wells, water quality parameters often show significant vertical stratification or gradient changes with depth.

[0003] Therefore, obtaining accurate and undisturbed in-situ water samples at different specific depths is crucial for studying the spatial distribution of water physicochemical properties, tracking the vertical migration of pollutants, assessing the health of aquatic ecosystems, and conducting precise resource management. Currently, common stratified sampling devices, such as single-trigger water samplers, can collect water samples at a set depth, but usually only one or a limited number of discrete samples can be obtained at a time. To complete continuous sampling of a water area, repeated operations such as rope deployment and retrieval, triggering, recovery, and cleaning are required, which is cumbersome, time-consuming, and labor-intensive. Furthermore, multiple operations are prone to introducing human error and cross-contamination risks. In addition, most existing devices lack effective isolation mechanisms for surface water mixing during the sampling process, which may contaminate the samples in the lower layers. Therefore, this application provides a quantitative sampling device for water quality analysis to meet the needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a quantitative sampling device for water quality analysis to solve the problems of cumbersome operation, low efficiency, easy cross-contamination and surface water mixing of existing sampling devices.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A quantitative sampling device for water quality analysis includes a chassis, a fixed frame fixedly connected to the chassis, electric telescopic rods symmetrically mounted on the top of the fixed frame, a servo motor fixedly connected to the bottom of the movable end of the electric telescopic rod, a first gear fixedly connected to the end of the drive shaft of the servo motor, a movable frame rotatably connected to the bottom of the first gear via a connecting rod and a bearing seat, a pressure frame fixedly connected to the bottom of the movable frame, uniformly distributed positioning seats fixedly mounted on the chassis, and a through opening at the bottom of the chassis, a sampling tube sleeved inside the positioning seats, a water pipe fixedly connected to the bottom of the sampling tube; the inside of the sampling tube... An extraction assembly is provided, which is used to create negative pressure in the sampling cylinder to extract water samples. The extraction assembly includes a piston fitted inside the sampling cylinder, with the outer ring of the piston fitting against the inner wall of the sampling cylinder. The top of the extraction assembly extends to the outside of the sampling cylinder and is equipped with a second gear. There are four sets of both the sampling cylinder and the second gear, and the height of the four second gears on the sampling cylinder gradually increases. A support column is fixedly connected to the middle of the chassis, and evenly distributed sealing components are provided on the outside of the support column. The sealing components are used to seal the opening at the end of the water pipe, and the sealing components include a movable rod fixedly connected to the outside of the support column.

[0006] Optionally, the bottom end of the first gear is fixedly connected to the top end of the connecting rod, the bottom end of the connecting rod is fixedly connected to the inner wall of the bearing housing, and the outer side of the bearing housing is fixedly connected to the top end of the movable frame.

[0007] Optionally, the positioning seat has an opening facing the movable rod on its exterior, and a fastening bolt is threaded onto the exterior of the positioning seat. The sampling cylinder has a threaded groove on its exterior that matches the shape of the fastening bolt.

[0008] Optionally, the bottom of the sampling tube is provided with a base surrounding the outside of the water pipe, and the base has an opening facing the movable rod, through which the end of the water pipe passes and extends to the outside of the sampling tube.

[0009] Optionally, a threaded tube is fixedly connected to the top of the piston, and a threaded rod is rotatably connected to the top of the sampling cylinder via a bearing. The threaded rod is threadedly connected to the threaded tube, and the top of the threaded rod extends to the top of the sampling cylinder and is fixedly connected to a second gear.

[0010] Optionally, limiting tubes are symmetrically installed between the piston and the inner wall of the sampling cylinder. The limiting tubes consist of an inner tube and an outer tube. The outer tube is fixedly connected to the top of the piston, and the inner tube is fixedly connected to the top of the inner wall of the sampling cylinder. The inner tube is slidably sleeved in the outer tube.

[0011] Optionally, the top of the sampling cylinder is provided with an operating port, a sealing plug corresponding to the position of the operating port is fitted on the piston, and a through circular hole adapted to the shape of the sealing plug is provided in the piston.

[0012] Optionally, the positions of the movable rod and the sampling cylinder correspond one-to-one, the movable rod and the support column are parallel to each other, the top of the movable rod is bent and fixedly connected to the top of the support column, and a C-shaped weakening zone is opened near the bend of the movable rod.

[0013] Optionally, a guide groove is provided in the movable rod, and a closed head is fixedly connected to the outer side of the bottom end of the movable rod. The closed head is adapted to the shape of the end of the water pipe, and the pressure frame is sleeved inside the guide groove.

[0014] Optionally, a C-shaped area is provided on the inner side of the guide groove, and the position of the C-shaped area in the guide groove gradually rises, with the distance between adjacent guide grooves being the same as the distance between adjacent second gears.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up a liftable first gear, connecting rod and pressure frame, when the first gear presses down and meshes with the second gear at different heights, the pressure frame presses down synchronously on the corresponding C-shaped area, causing the movable rod to deform in the weakened area, driving the sealing head to detach from the water pipe, realizing the linkage control between the sealing component and the extraction component, and ensuring the accurate opening and closing and isolation of the sampling channel when collecting water samples at different depths.

[0016] By setting up an extraction assembly consisting of a piston, threaded tube, threaded rod, and limiting tube, and cooperating with a servo motor to drive the first and second gears, the rotation of the threaded rod is converted into the linear displacement of the piston, forming a stable negative pressure in the sampling cylinder. This enables the quantitative extraction and storage of water samples at different depths, ensuring the accuracy of the sampling volume and the controllability of the operation.

[0017] By setting up multiple second gears with gradually increasing heights and corresponding C-shaped guide grooves, and using an electric telescopic rod to drive the first gear to move down step by step, the device can automatically and sequentially switch between different sampling cylinders during the lowering process, completing continuous sampling of multiple water layers, thus improving sampling efficiency and the degree of automation of depth sequence sampling.

[0018] By setting up an elastic sealing component consisting of a support column, a movable rod, and a weakened area, after the pressure frame is disengaged from the C-shaped area, the movable rod resets itself using its own elasticity, driving the sealing head to automatically re-insert into the end of the water pipe. This achieves immediate sealing of the completed sample, preventing cross-contamination during subsequent sampling and ensuring the independence and representativeness of water samples from each layer.

[0019] By integrating electric telescopic poles, servo motors, gear transmissions, and negative pressure extraction mechanisms, and coordinating with closed components for control, the entire process of lowering, depth positioning, channel opening, quantitative suction, closed preservation, and switching sampling is fully automated. This significantly improves the accuracy, efficiency, and continuity of water quality stratification sampling, while reducing the burden of manual operation and the risk of errors. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0021] Figure 1 A first-person perspective three-dimensional structural diagram of a quantitative sampling device for water quality analysis; Figure 2 A second-view three-dimensional structural diagram of a quantitative sampling device for water quality analysis; Figure 3 A third-view stereoscopic structural diagram of a quantitative sampling device for water quality analysis; Figure 4 A schematic diagram of the structure in which the fixed frame, electric telescopic rod, and servo motor work together; Figure 5 A schematic diagram of the structure of the electric telescopic pole, servo motor, and connecting rod. Figure 6 This is a schematic diagram of the structure where the movable rod and the pressure frame work together. Figure 7 This is a schematic diagram of the three-dimensional structure of the movable frame; Figure 8 This is a schematic diagram of the three-dimensional structure of the movable rod; Figure 9 This is a schematic diagram of the cooperation structure between the sampling cylinder and the movable rod; Figure 10 for Figure 9 Enlarged structural diagram at point A in the middle; Figure 11 This is a schematic diagram of a partial cross-sectional view of the sampling cylinder; Figure 12 for Figure 11 Enlarged structural diagram at point B.

[0022] Figure label: 1. Chassis; 2. Fixing frame; 3. Electric telescopic rod; 4. Servo motor; 5. First gear; 6. Second gear; 7. Sampling cylinder; 8. Positioning seat; 9. Fastening bolt; 10. Through opening; 11. Connecting rod; 12. Movable frame; 13. Bearing seat; 14. Movable rod; 15. Support column; 16. Weakened area; 17. Sealing head; 18. Guide groove; 19. Pressing frame; 20. C-shaped area; 21. Threaded groove; 22. Water pipe; 23. Base; 24. Operating port; 25. Threaded rod; 26. Threaded pipe; 27. Limiting tube; 28. Piston; 29. ​​Sealing plug.

[0023] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0024] The quantitative sampling device for water quality analysis provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0025] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0026] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0027] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0028] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0029] like Figures 1 to 6 As shown, an embodiment of the present invention provides a quantitative sampling device for water quality analysis, including a chassis 1, a fixed frame 2 fixedly connected to the chassis 1, an electric telescopic rod 3 symmetrically mounted on the top of the fixed frame 2, a servo motor 4 fixedly connected to the bottom of the movable end of the electric telescopic rod 3, a first gear 5 fixedly connected to the end of the drive shaft of the servo motor 4, a movable frame 12 rotatably connected to the bottom of the first gear 5 through a connecting rod 11 and a bearing seat 13, a pressure frame 19 fixedly connected to the bottom of the movable frame 12, uniformly distributed positioning seats 8 fixedly mounted on the chassis 1, and a through opening 10 opened at the bottom of the chassis 1, a sampling cylinder 7 sleeved inside the positioning seats 8, a water pipe 22 fixedly connected to the bottom of the sampling cylinder 7, and an extraction component provided inside the sampling cylinder 7, the extraction component being used to create negative pressure in the sampling cylinder 7 to extract water samples, the top of the extraction component extending to the sampling cylinder 7. The outer side of the sampling cylinder 7 is equipped with a second gear 6. There are four sets of the sampling cylinder 7 and the second gear 6. The height of the four second gears 6 on the sampling cylinder 7 gradually increases. A support column 15 is fixedly connected to the middle of the chassis 1. A uniformly distributed sealing component is provided on the outer side of the support column 15. The sealing component is used to seal the opening at the end of the water pipe 22. The bottom end of the first gear 5 is fixedly connected to the top end of the connecting rod 11. The bottom end of the connecting rod 11 is fixedly connected to the inner side wall of the bearing seat 13. The outer side of the bearing seat 13 is fixedly connected to the top end of the movable frame 12. This allows the first gear 5 to drive the connecting rod 11 and the bearing seat 13 to descend when it descends. This pushes the pressure frame 19 at the bottom end of the movable frame 12 to drive the sealing component to work. The bearing seat 13 makes the first gear 5 drive the connecting rod 11 to rotate, but not drive the movable frame 12 to rotate, ensuring that the movable frame 12 only moves vertically.

[0030] In actual operation, the entire device is lowered into the water area to be sampled using ropes and cables. Once the device reaches the required sampling depth, the electric telescopic rod 3 operates, driving the first gear 5 and connecting rod 11 to descend via its movable end. This causes the first gear 5 to engage with the second gear 6 at its highest position. Simultaneously, the descent of the connecting rod 11 causes the pressure frame 19 to press against the sealing assembly, releasing the seal on a water pipe 22. This allows a sampling cylinder 7 to connect to the water in the area via the water pipe 22. Then, the servo motor 4 operates, driving the extraction assembly through the transmission of the first gear 5 and the second gear 6, to extract the sample from the area. A quantitative amount of water is drawn into the sampling cylinder 7 for storage. After one quantitative sampling is completed, the electric telescopic rod 3 works again to drive the first gear 5 to move to the next second gear 6. At this time, the sampling cylinder 7, which has completed sampling, is sealed by the sealing component to form a sealed preservation of the sample and prevent the obtained water sample from being contaminated. At the same time, the water pipe 22 at the other unsampled sampling cylinder 7 is opened. Then, the device is lowered to a deeper water area and the above operation is repeated for a second sampling. This process is repeated to achieve multiple continuous samplings. After all the sampling work is completed, the entire device is lifted out of the water, thus completing the quantitative sampling process of the entire device.

[0031] In this embodiment, as Figures 2 to 10 As shown, the positioning seat 8 has an opening on its exterior facing the movable rod 14, and a fastening bolt 9 is threaded onto the exterior of the positioning seat 8. The sampling cylinder 7 has a threaded groove 21 on its exterior that matches the shape of the fastening bolt 9. A base 23 is provided at the bottom of the sampling cylinder 7, surrounding the water pipe 22. An opening facing the movable rod 14 is provided on the base 23. The end of the water pipe 22 passes through the opening and extends to the outside of the sampling cylinder 7. The opening on the exterior of the positioning seat 8 allows the water pipe 22 at the bottom of the sampling cylinder 7 to extend out, making... The end of the water pipe 22 faces the position of the movable rod 14, which can be used to open and close the water pipe 22 in conjunction with the operation of the sealing component. The base 23 ensures that after the sampling tube 7 is installed and fixed, there is a certain space between its bottom and the top of the base plate 1 to accommodate the water pipe 22. It also ensures that the bottom of the sampling tube 7 is not uneven due to the water pipe 22 and can be placed vertically. This ensures the stability of the sampling tube 7 when it is removed from the device and placed upright alone. After the sampling tube 7 is fitted into the positioning seat 8, the end of the fastening bolt 9 can be inserted into the threaded groove 21 on the outside of the sampling tube 7 for connection and fixation by rotating the fastening bolt 9. This ensures the stability of the connection and fixation between the sampling tube 7 and the base plate 1 and the positioning seat 8 during the sampling process. The operation is simple and convenient, and the fixation is stable and reliable. When the sampling tube 7 is removed from the device after sampling, the water pipe 22 can be sealed with a sealing cap or other means to prevent the water sample from leaking during the transfer process.

[0032] In this embodiment, as Figures 9 to 12 As shown, the extraction assembly includes a piston 28 fitted inside a sampling cylinder 7. The outer ring of the piston 28 is in contact with the inner wall of the sampling cylinder 7. A threaded tube 26 is fixedly connected to the top of the piston 28. A threaded rod 25 is rotatably connected to the top of the sampling cylinder 7 via a bearing. The threaded rod 25 is threadedly connected to the threaded tube 26. The top of the threaded rod 25 extends above the top of the sampling cylinder 7 and is fixedly connected to a second gear 6. Limiting tubes 27 are symmetrically installed between the piston 28 and the inner wall of the sampling cylinder 7. The limiting tube 27 consists of an inner tube and an outer tube. The outer tube is fixedly connected to the top of the piston 28, and the inner tube is fixedly connected to the top of the inner wall of the sampling cylinder 7. The inner tube can slide. The inner and outer tubes of the limiting tube 27, fitted inside the outer tube, guide and limit the movement of the piston 28 within the sampling cylinder 7. This prevents the rotation of the threaded rod 25 from causing the threaded tube 26 and piston 28 to rotate, ensuring that the rotation of the threaded rod 25 can push the threaded tube 26 and piston 28 to generate displacement. An operating port 24 is provided at the top of the sampling cylinder 7. A sealing plug 29, corresponding to the position of the operating port 24, is fitted onto the piston 28, and a through-hole with a shape matching the sealing plug 29 is provided in the piston 28. After the sampling cylinder 7 completes quantitative sampling, when it is necessary to remove the sampling cylinder 7 from the device and pour out the water sample, it can be pulled out through the operating port 24. The sealing plug 29 restores the air pressure inside and outside the sampling cylinder 7, allowing the obtained water sample to be quickly discharged through the water pipe 22. Driven by the electric telescopic rod 3, the first gear 5 and the second gear 6 mesh, and the extraction component associated with the second gear 6 is in a ready-to-work state. At this time, the sealing component corresponding to the position of the sampling cylinder 7 opens. When sampling is required, the servo motor 4 operates and drives the first gear 5 to rotate through its drive shaft. Then, through the meshing transmission between the first gear 5 and the second gear 6, the threaded rod 25 rotates. Subsequently, through the threaded connection between the threaded rod 25 and the threaded tube 26, the piston 28 is pushed along the guide direction of the limiting tube 27. The upper position causes a negative pressure to be generated between the piston 28 and the bottom of the inner wall of the sampling cylinder 7, and the water sample of the corresponding area is simultaneously extracted into the sampling cylinder 7 through the base 23 for storage. After the required amount of water sample for the quantitative area is reached, the electric telescopic rod 3 works again to press down and switch the second gear 6 that meshes with the first gear 5, so that the sampling cylinder 7 is closed again after sampling, and the sampling cylinder 7 corresponding to the second gear 6 that meshes with the first gear 5 enters the preparation working state, thereby realizing the quantitative extraction of water sample, and the sampling cylinder 7 can be quickly switched with the operation of the electric telescopic rod 3, which can realize continuous sampling operation at different depths.

[0033] In this embodiment, as Figures 4 to 10As shown, the sealing assembly includes a movable rod 14 fixedly connected to the outside of the support column 15. The movable rod 14 corresponds one-to-one with the sampling cylinder 7. The movable rod 14 and the support column 15 are parallel to each other. The top end of the movable rod 14 is bent and fixedly connected to the top end of the support column 15. A C-shaped weakening zone 16 is provided near the bend of the movable rod 14. The weakening zone 16 makes the movable rod 14 thinner and weaker at the weakening zone 16, making it easier to deform under external force. A guide groove 18 is provided in the movable rod 14. A sealing head 17 is fixedly connected to the outside of the bottom end of the movable rod 14. The sealing head 17 is adapted to the shape of the end of the water pipe 22. The pressure frame 1 Nine gears are installed inside the guide groove 18. A C-shaped area 20 is provided inside the guide groove 18. The position of the C-shaped area 20 in the guide groove 18 gradually rises. The distance the adjacent guide grooves 18 rise by is the same as the distance the adjacent second gears 6 rise by. When the first gear 5 is at its highest position, it does not mesh with any of the second gears 6. Simultaneously affected by the positions of the first gear 5, connecting rod 11, movable frame 12, and bearing seat 13, the pressure frame 19 is also at its highest position. At this time, the pressure frame 19 does not contact any of the C-shaped areas 20 in the guide grooves 18. All the sealing heads 17 are embedded in the corresponding water pipes 22, sealing the water pipes 22. As the first gear 5 presses down and meshes with the highest second gear 6, the pressure frame 19 also presses down to the C-shaped area 20 of the corresponding sealing component. By pressing against the C-shaped area 20 in the guide groove 18, the movable rod 14 bends and deforms at the weakened area 16, moving away from the sampling cylinder 7. This causes the sealing head 17 to retract from the end of the water pipe 22, releasing the seal on the water pipe 22 and allowing it to form a channel between the external water sample and the inside of the sampling cylinder 7, enabling sampling. Furthermore, since the increase in elevation between adjacent guide grooves 18 is the same as the increase in elevation between adjacent second gears 6, the first gear 5, when switching its meshing position... Simultaneously with the engagement of the second gear 6, the pressure frame 19 also switches the corresponding C-shaped area 20 in the distribution component it is pressing, thereby realizing the synchronous switching of the sealing component and the extraction component. This allows for the rapid switching of the sampling cylinder 7 during the continuous sampling process. As the pressure frame 19 descends, the sealing component corresponding to the sampling cylinder 7 that has completed sampling will return to its original position after the pressure frame 19 leaves the C-shaped area 20, restoring it to a state parallel to the support column 15. This allows the sealing head 17 at the bottom of the movable rod 14 to be inserted back into the water pipe 22, sealing and isolating the sampling cylinder 7 after sampling to prevent the obtained water sample from being contaminated during subsequent sampling.

[0034] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A quantitative sampling device for water quality analysis, characterized in that, The system includes a chassis, a fixed frame fixedly connected to the chassis, electric telescopic rods symmetrically mounted on the top of the fixed frame, a servo motor fixedly connected to the bottom of the movable end of the electric telescopic rod, a first gear fixedly connected to the end of the drive shaft of the servo motor, a movable frame rotatably connected to the bottom of the first gear through a connecting rod and a bearing seat, a pressure frame fixedly connected to the bottom of the movable frame, evenly distributed positioning seats fixedly mounted on the chassis, and a through opening opened at the bottom of the chassis, a sampling tube fitted inside the positioning seat, and a water pipe fixedly connected to the bottom of the sampling tube; The sampling tube is equipped with an extraction component, which is used to create negative pressure in the sampling tube to extract water samples. The extraction component includes a piston fitted inside the sampling tube, and the outer ring of the piston is in contact with the inner wall of the sampling tube. The top of the extraction component extends to the outside of the sampling cylinder and is equipped with a second gear. There are four sets of both the sampling cylinder and the second gear, and the height of the four second gears on the sampling cylinder gradually increases. A support column is fixedly connected to the middle of the chassis, and evenly distributed sealing components are provided on the outside of the support column. The sealing components are used to seal the opening at the end of the water pipe, and the sealing components include a movable rod fixedly connected to the outside of the support column.

2. The quantitative sampling device for water quality analysis according to claim 1, characterized in that, The bottom end of the first gear is fixedly connected to the top end of the connecting rod, the bottom end of the connecting rod is fixedly connected to the inner wall of the bearing seat, and the outer side of the bearing seat is fixedly connected to the top end of the movable frame.

3. The quantitative sampling device for water quality analysis according to claim 1, characterized in that, The positioning seat has an opening facing the movable rod on its outside, and a fastening bolt is threaded onto the outside of the positioning seat. The sampling cylinder has a threaded groove on its outside that matches the shape of the fastening bolt.

4. The quantitative sampling device for water quality analysis according to claim 1, characterized in that, The bottom of the sampling tube is provided with a base that surrounds the outside of the water pipe. The base has an opening facing the movable rod. The end of the water pipe passes through the opening and extends to the outside of the sampling tube.

5. The quantitative sampling device for water quality analysis according to claim 1, characterized in that, A threaded tube is fixedly connected to the top of the piston, and a threaded rod is rotatably connected to the top of the sampling cylinder via a bearing. The threaded rod is threadedly connected to the threaded tube, and the top of the threaded rod extends to the top of the sampling cylinder and is fixedly connected to a second gear.

6. The quantitative sampling device for water quality analysis according to claim 5, characterized in that, A limiting tube is symmetrically installed between the piston and the inner wall of the sampling cylinder. The limiting tube consists of an inner tube and an outer tube. The outer tube is fixedly connected to the top of the piston, and the inner tube is fixedly connected to the top of the inner wall of the sampling cylinder. The inner tube is slidably sleeved in the outer tube.

7. The quantitative sampling device for water quality analysis according to claim 1, characterized in that, The top of the sampling cylinder has an operating port, and a sealing plug corresponding to the position of the operating port is fitted on the piston. A through circular hole matching the shape of the sealing plug is also provided in the piston.

8. The quantitative sampling device for water quality analysis according to claim 1, characterized in that, The positions of the movable rod and the sampling cylinder are one-to-one, the movable rod and the support column are parallel to each other, the top of the movable rod is bent and fixedly connected to the top of the support column, and a C-shaped weakening zone is opened near the bend of the movable rod.

9. The quantitative sampling device for water quality analysis according to claim 8, characterized in that, The movable rod has a guide groove, and a closed head is fixedly connected to the outer side of the bottom end of the movable rod. The closed head is adapted to the shape of the end of the water pipe, and the pressure frame is sleeved inside the guide groove.

10. The quantitative sampling device for water quality analysis according to claim 9, characterized in that, A C-shaped area is provided on the inner side of the guide groove. The position of the C-shaped area in the guide groove gradually rises, and the distance between adjacent guide grooves is the same as the distance between adjacent second gears.

Images