Anti-blocking self-dredging type detection sampler for water quality in water conservancy
By designing a self-closed structure and liquid storage structure in the detection sampler for water conservancy and water quality, using airbags to supply air to promote the activity of the built-in nesting, the problem of port blockage during the sampling process is solved, and the effects of self-driving and accurate sampling are achieved.
Patent Information
- Application Number
- CN202510299838.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2025-06-20
AI Technical Summary
The existing water quality detection sampler is prone to port blockage during operation, and cannot perform self-driving treatment at the same time as sampling, which has limitations in use.
An anti-blocking self-dressing detection sampler is designed, adopting a self-closed structure and a liquid storage structure, which promotes the activity of the built-in nesting through the airbag supply, forming a negative pressure and self-sealing effect, realizing self-dressing and accurate sampling.
It effectively avoids port blockage during the sampling process, improves the practicality of the device and sampling quality, and ensures accurate sampling of water quality at different locations.
Smart Images

Figure CN120177115A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of detection samplers, and particularly to a self-unclogging and anti-clogging detection sampler for water conservancy water quality. Background Technique
[0002] During the process of regional detection of water conservancy water quality, it is necessary to adapt a corresponding detection sampler to sample the corresponding water area; For example, a farmland irrigation water detection sampler with the publication number CN211347530U, which relates to the technical field of water quality monitoring, includes a housing. A sampling bottle is arranged inside the housing, and a second connecting column is fixed to the outside of the housing. A fixing block is fixed to the bottom of the second connecting column, and a first connecting column penetrating into the fixing block is arranged at the top of the second connecting column. A rotating rod is arranged at the top of the first connecting column, and a second gear is arranged at the bottom of the first connecting column. A chain is arranged on the outside of the second gear. A filter plate is fixed to the top of the sampling bottle, and a cover plate is arranged on the top of the filter plate. A limiting block is arranged inside the housing on the outside of the sampling bottle. By setting the filter plate and the scraper, water flow will pass through the filter plate and enter the sampling bottle. The filter plate will filter the water. When the sampling bottle moves downward, the scraper will clean the outer wall of the filter plate, thus solving the problem of being unable to filter impurities in the water; Another example is a deep groundwater detection sampler with the publication number CN211317879U, which includes a vertical plate. A cross beam is arranged at the top inside the vertical plate. A floating block is arranged at the top of the vertical plate and the cross beam. A load-bearing block is arranged at the bottom of the vertical plate. A fixing block is arranged at the top of the cross beam. A towing rope is arranged inside the fixing block. One end of the towing rope is connected to a retracting device. A lower joint and an upper joint are arranged on one side of the top of the cross beam, which relates to the technical field of water sampling. By setting the vertical plate, T-shaped sliding groove, T-shaped sliding block, threaded hole, and fixing bolt, the sampler slides in the vertical plate through the T-shaped sliding groove and T-shaped sliding block, so that the distance between two groups of samplers can be adjusted. The sampler is fixed to the vertical plate through the fixing bolt and threaded hole, so that groundwater at different depths can be sampled simultaneously, saving time and effort and improving the sampling efficiency; A kind of hydrological and water conservancy water quality sampler with the publication number of CN219302037U, including a housing. There is a sampling pipe above the housing. A partition is fixedly connected to the inner wall of the housing. A pump body is fixedly installed on the upper surface of the partition. The input end of the pump body is fixedly communicated with a connecting pipe. The top end of the connecting pipe penetrates through the housing and extends above the housing. The top end of the connecting pipe is fixedly communicated with an outer joint. The top end of the outer joint is fixedly communicated with an inner joint. The top end of the inner joint is fixedly communicated with the left end of the sampling pipe. The output end of the pump body is fixedly communicated with a drain pipe. The bottom end of the drain pipe penetrates through the partition and extends below the partition. A sewage discharge port is opened on the bottom surface of the housing. A rubber sealing plug is threadedly connected to the inner wall of the sewage discharge port. It achieves the effect of quickly sampling water liquid, improves the flexibility during the sampling operation of hydrological and water conservancy water quality, and avoids the problem of inconvenient operation during sampling. Most of the water quality samplers in the above-mentioned comparative documents improve their overall structures. However, during the operation of the existing detection samplers for water conservancy water quality, impurities in the water are easily sucked at their ports, resulting in blockage at their ports. It is impossible to perform self-unclogging treatment on the inside of the equipment while sampling, and thus there are certain limitations in use. Summary of the Invention
[0003] The purpose of the present invention is to provide a self-unclogging type detection sampler for water conservancy water quality that prevents blockage, so as to solve the problem proposed in the above background technology that during the operation process, impurities in the water are easily sucked at its port, resulting in blockage at its port, and it is impossible to perform self-unclogging treatment on the inside of the equipment while sampling, and thus there are certain limitations in use.
[0004] To achieve the above purpose, the present invention provides the following technical solution: A self-unclogging type detection sampler for water conservancy water quality that prevents blockage, including a docking connection hose and a docking base body. The lower end of the docking connection hose is fixedly connected to the docking base body, and an air delivery hose penetrates through the inside of the docking base body; The upper end of the docking connection hose is docked with a first airbag, and the first airbag is connected to the air delivery hose. The upper end inside the docking base body is adhesively connected with a second airbag, and the second airbag is connected to the air delivery hose. An internal embedded kit is nested and installed inside the docking base body, and the upper end of the internal embedded kit is docked with the second airbag. A self-sealing structure is provided between the internal embedded kit and the docking base body, and the sampling state of the docking base body is self-sealed through the self-sealing structure; A liquid storage structure is arranged inside the docking base body, and the sampled water quality is stored in a closed and impurity-removing manner through the liquid storage structure.
[0005] Furthermore, the self-enclosed structure is provided with a first pull rope, which is arranged on the outside of the built-in nested part and extends along the inside of the docking base. A docking piston part is nested and installed on the inner side of the built-in nested part, and the upper end of the docking piston part is docked with the end of the first pull rope, and a first spring is fixedly connected between the docking piston part and the built-in nested part.
[0006] Furthermore, a preset channel is opened at the lower end of the built-in nesting piece, and a sealing docking piece is nested and installed inside the preset channel, and a second spring is fixedly connected between the sealing docking piece and the inner side of the built-in nesting piece; A nested resistance piece is nested and installed at the lower end of the built-in nested piece, and a second pull rope is docked on the outer side of the nested resistance piece, and the second pull rope passes through the inner side of the built-in nested piece, and the second pull rope and the outer side of the sealing docking piece are docked with each other, and the lower end of the docking base is rotatably connected to an external protective piece, and the axial end of the external protective piece is docked with a torsion spring to support it.
[0007] Furthermore, the first airbag supplies air to the interior of the second airbag through an air supply hose, so that the second airbag expands and pushes the built-in nesting part to move downward along the interior of the docking base.
[0008] Furthermore, when the built-in nested part is forced to move downward, the first pull rope drives the docking piston part to move upward against the inner wall of the built-in nested part to form a negative pressure working state, and the docking piston part cooperates with the first spring to form an elastic structure along the inside of the built-in nested part.
[0009] Furthermore, the built-in nested part is forced to move downward to simultaneously press the nested resistance part at the lower end, so that it can simultaneously push the external protective part in contact downward to start working, and the nested resistance part cooperates with the second pull rope on the outside to drive the sealing docking part to automatically unfold along the inside of the preset channel.
[0010] Furthermore, the liquid storage structure is provided with a docking filter, and the docking filter is fixedly docked to the inner side of the lower end of the built-in nested part, and a preset conductive hose is penetrated and docked through the outer side of the lower end of the built-in nested part, and a liquid storage cavity is opened on the inner side of the lower end of the docking base, and the liquid storage cavity and the preset conductive hose are connected to each other, and the interior of the preset conductive hose is bonded and connected with a fitting docking part, and a discharge channel is provided at the lower end of the liquid storage cavity.
[0011] Furthermore, the liquid sucked from the inside of the built-in nested component will be filtered by the docking filter component and then transmitted to the inside of the liquid storage cavity for storage processing in conjunction with the preset conductive hose, and the pressurized state of the fitting docking component on the inner wall of the preset conductive hose will be deformed and separated from the fitting state to achieve a connected state.
[0012] Furthermore, when the built-in nested parts are forced to move downward, the preset conductive hose on the side is simultaneously stretched downward, so that the liquid absorbed inside the built-in nested parts in the connected state cannot be transmitted to the liquid storage cavity. When the built-in nested parts are reset, the liquid accumulated inside the built-in nested parts in the high position will be filtered by the docking filter and transmitted to the liquid storage cavity for sealed sampling processing in conjunction with the preset conductive hose.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The anti-clogging self-dredging water conservancy water quality detection sampler is provided with a self-sealing structure. It only needs to hold the first airbag and apply pressure to supply air to the inside of the second airbag through the air supply hose, so that it expands and pushes the built-in nested parts to move outward, so that the built-in nested parts in the closed state can cooperate with the nested resistance parts to push open the external protective parts, forming a protruding protective sampling operation step, and the nested resistance parts that are forced to move inward will then drive two groups of fitted sealing docking parts to automatically unfold outward through the second pull rope, and perform a secondary opening and closing sampling operation on the sealed built-in nested parts, so as to avoid the water quality at different positions from causing different effects on the sampling process. During the operation, the impurities in the water contacted at the port of the built-in nested parts are pushed outward through the protruding state of the built-in nested parts, and the self-dredging process is performed while sampling, thereby improving the practicality of the device. Furthermore, in the process of the built-in nested part being forced to move inward, the first pull rope with a relatively unchanged length will be stressed accordingly, driving the docking piston part on its inner side to be synchronously stressed and move in the opposite direction to the built-in nested part, thereby forming a negative pressure inside the built-in nested part, and then cooperating with the bottom of the built-in nested part in the outward-moving expanded state, quickly performing sampling work at the corresponding position, controlling the sampling accuracy, and improving the sampling quality of the device; Furthermore, a liquid storage structure is provided, and the liquid sucked inside the built-in nested part will be filtered by the docking filter element and then transmitted to the interior of the liquid storage cavity for storage treatment in cooperation with a preset conductive hose, and in the process of the built-in nested part being forced to move downward, the preset conductive hose on the side is simultaneously stretched downward, so that the liquid absorbed inside the built-in nested part in the connected state cannot be transmitted to the interior of the liquid storage cavity. When the built-in nested part is reset, the liquid stored in the built-in nested part in the high position will be filtered by the docking filter element and then transmitted to the interior of the liquid storage cavity for sealed sampling treatment in cooperation with the preset conductive hose, thereby utilizing the water level difference to form efficient and accurate sampling work. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of a half-cut three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of a half-cut three-dimensional structure of a butt-connected hose of the present invention; Figure 4 For the present invention Figure 1 is a schematic diagram of a partially enlarged structure in the present invention; Figure 5 is a schematic diagram of a half-section three-dimensional structure of a docking filter element of the present invention; Figure 6 is a schematic diagram of a three-dimensional structure of a sealing docking member of the present invention; Figure 7 is a schematic diagram of a half-section three-dimensional structure of a docking piston member of the present invention; Figure 8 is a schematic diagram of a three-dimensional structure of a first airbag of the present invention.
[0015] In the figure: 1, docking connection hose; 2, docking base; 3, gas transmission hose; 4, first airbag; 5, second airbag; 6, built-in inlay kit; 7, first pull rope; 8, docking piston member; 9, first spring; 10, docking filter element; 11, preset channel; 12, liquid storage cavity; 13, preset conduction hose; 14, fitting docking member; 15, sealing docking member; 16, second spring; 17, second pull rope; 18, nested contact member; 19, external protection member; 20, discharge channel. Specific embodiments
[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0017] Embodiment 1: Please refer to Figure 1-8 , the present invention provides the following technical solutions: An anti-blocking self-unclogging water quality detection sampler for water conservancy includes a docking connection hose 1, a docking base 2, a gas transmission hose 3, a first airbag 4, a second airbag 5, a built-in inlay kit 6, a first pull rope 7, a docking piston member 8, a first spring 9, a docking filter element 10, a preset channel 11, a liquid storage cavity 12, a preset conduction hose 13, a fitting docking member 14, a sealing docking member 15, a second spring 16, a second pull rope 17, a nested contact member 18, an external protection member 19, and a discharge channel 20; The lower end of the docking connection hose 1 is fixedly connected to a docking base body 2, and a gas transmission hose 3 penetrates through the inside of the docking base body 2; the upper end of the docking connection hose 1 is docked with a first airbag 4, and the first airbag 4 is communicated with the gas transmission hose 3. The upper end inside the docking base body 2 is adhesively connected with a second airbag 5, and the second airbag 5 is communicated with the gas transmission hose 3. An internal embedding kit 6 is nested and installed inside the docking base body 2, and the upper end of the internal embedding kit 6 is docked with the second airbag 5. A self-sealing structure is arranged between the internal embedding kit 6 and the docking base body 2, and the sampling state of the docking base body 2 is self-sealed through the self-sealing structure; The self-sealing structure is provided with a first pull rope 7. The first pull rope 7 is arranged on the outer side of the internal embedding kit 6 and extends along the inside of the docking base body 2. A docking piston part 8 is nested and installed inside the internal embedding kit 6, and the upper end of the docking piston part 8 is docked with the end of the first pull rope 7. A first spring 9 is fixedly connected between the docking piston part 8 and the internal embedding kit 6. A preset channel 11 is opened at the lower end of the internal embedding kit 6, and a sealing docking part 15 is nested and installed inside the preset channel 11, and a second spring 16 is fixedly connected between the sealing docking part 15 and the inside of the internal embedding kit 6; The lower end of the built-in nested part 6 is nested with a nested resistance part 18, and the outer side of the nested resistance part 18 is docked with a second pull rope 17, and the second pull rope 17 runs through the inner side of the built-in nested part 6, and the second pull rope 17 is docked with the outer side of the sealing docking part 15. The lower end of the docking base 2 is rotatably connected with an external protective part 19, and the axial end of the external protective part 19 is docked with a torsion spring to support it. The first airbag 4 supplies air to the inside of the second airbag 5 through the air supply hose 3, so that the second airbag 5 expands and pushes the built-in nested part 6 to move downward along the inside of the docking base 2. In the process of the built-in nested part 6 being forced to move downward, the first pull rope 7 drives the docking piston part 8 to move upward against the inner wall of the built-in nested part 6 to form a negative pressure working state, and the docking piston part 8 cooperates with the first spring 9 to form an elastic structure along the inside of the built-in nested part 6. The built-in nesting part 6 is forced to move downward and simultaneously press the nesting resistance part 18 at the lower end, so that it pushes the external protective part 19 downward synchronously to start working, and the nesting resistance part 18 cooperates with the second pull rope 17 on the outside to drive the sealing docking part 15 to automatically unfold along the inside of the preset channel 11. The user only needs to hold the first airbag 4 and apply pressure to it, so that it can supply air to the second airbag 5 inside the docking connection hose 1 through the air delivery hose 3, so that it expands and pushes the built-in nested part 6 to move outward, so that the closed built-in nested part 6 can cooperate with the nested resistance part 18 to push open the external protective part 19, forming a protective sampling operation step after protrusion, and the nested resistance part 18 that is forced to move inward will then drive the two groups of fitted sealed docking parts 15 to automatically unfold outward through the second pull rope 17, and perform a secondary opening and closing sampling operation on the sealed built-in nested part 6 to avoid the different effects of water quality at different positions on the sampling process. During the operation, the impurities in the water contacted at its port are pushed outward through the protruding state of the built-in nested part 6, and self-dredging treatment is performed while sampling; Example
[0018] On the basis of the first embodiment, a liquid storage structure is also disclosed, and its specific structure is as follows: A liquid storage structure is provided inside the docking base 2, and the sampled water is sealed and stored in a clean-up manner through the liquid storage structure.
[0019] The liquid storage structure is provided with a docking filter element 10, and the docking filter element 10 is fixedly docked inside the lower end of the built-in inlay kit 6. A preset conduction hose 13 penetrates and docks through the outside of the lower end of the built-in inlay kit 6. A liquid storage cavity 12 is formed inside the lower end of the docking base 2, and the liquid storage cavity 12 is communicated with the preset conduction hose 13. A fitting docking element 14 is adhesively connected inside the preset conduction hose 13. A discharge channel 20 is arranged at the lower end of the liquid storage cavity 12. The liquid sucked inside the built-in inlay kit 6 will be filtered by the docking filter element 10 and then transmitted to the inside of the liquid storage cavity 12 through the preset conduction hose 13 for storage processing. When the built-in inlay kit 6 is stressed and moves downward, the preset conduction hose 13 on the side is synchronously stretched and moved downward, so that the liquid absorbed inside the built-in inlay kit 6 in the connected state cannot be transmitted to the inside of the liquid storage cavity 12. When the built-in inlay kit 6 is reset, the liquid accumulated inside the built-in inlay kit 6 in the high position state will be filtered by the docking filter element 10 and then transmitted to the inside of the liquid storage cavity 12 through the preset conduction hose 13 for sealed sampling processing; during the process of the built-in inlay kit 6 being stressed and moving inward, the first pull rope 7 with a constant relative length will be stressed accordingly, driving the docking piston element 8 docked inside it to be stressed and move in the opposite direction to the built-in inlay kit 6, thereby forming a negative pressure inside the built-in inlay kit 6, and then cooperating with the bottom of the built-in inlay kit 6 in the outward-expanded state to quickly perform sampling work at the corresponding position and control the sampling accuracy; The liquid sucked inside the built-in inlay kit 6 will be filtered by the docking filter element 10 and then transmitted to the inside of the liquid storage cavity 12 through the preset conduction hose 13 for storage processing. During the process of the built-in inlay kit 6 being stressed and moving downward, the preset conduction hose 13 on the side is synchronously stretched and moved downward, so that the liquid absorbed inside the built-in inlay kit 6 in the connected state cannot be transmitted to the inside of the liquid storage cavity 12. When the built-in inlay kit 6 is reset, the liquid accumulated inside the built-in inlay kit 6 in the high position state will be filtered by the docking filter element 10 and then transmitted to the inside of the liquid storage cavity 12 through the preset conduction hose 13 for sealed sampling processing, using the water level height difference to form an efficient and accurate sampling work.
[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. An anti-clogging self-draining water conservancy water quality detection sampler, comprising a docking connection hose (1) and a docking base (2), wherein the lower end of the docking connection hose (1) is fixedly connected to the docking base (2), and a gas delivery hose (3) is penetrated and docked on the inner side of the docking base (2); Features: The upper end of the docking connection hose (1) is docked with a first airbag (4), and the first airbag (4) and the gas delivery hose (3) are connected to each other; the upper end of the interior of the docking base (2) is bonded with a second airbag (5), and the second airbag (5) and the gas delivery hose (3) are connected to each other; a built-in nesting piece (6) is nested and installed inside the docking base (2), and the upper end of the built-in nesting piece (6) and the second airbag (5) are docked to each other; a self-sealing structure is provided between the built-in nesting piece (6) and the docking base (2), and the sampling state of the docking base (2) is self-sealed by the self-sealing structure; A liquid storage structure is provided inside the docking base (2), and the sampled water is sealed and stored in a manner that removes impurities through the liquid storage structure.
2. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 1, characterized in that: The self-enclosed structure is provided with a first pull rope (7), the first pull rope (7) is arranged on the outside of the built-in nesting part (6), and the first pull rope (7) extends along the inside of the docking base (2), a docking piston part (8) is nested and installed on the inside of the built-in nesting part (6), and the upper end of the docking piston part (8) and the end of the first pull rope (7) are docked with each other, and a first spring (9) is fixedly connected between the docking piston part (8) and the built-in nesting part (6).
3. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 2, characterized in that: A preset channel (11) is provided at the lower end of the built-in nesting piece (6), a sealing butt joint piece (15) is nested and installed inside the preset channel (11), and a second spring (16) is fixedly connected between the sealing butt joint piece (15) and the inside of the built-in nesting piece (6); A nested resistance piece (18) is nested and installed at the lower end of the built-in nesting piece (6), and a second pull rope (17) is butted against the outer side of the nested resistance piece (18), and the second pull rope (17) passes through the inner side of the built-in nesting piece (6), and the second pull rope (17) and the outer side of the sealing butt joint piece (15) are butted against each other, and an external protective piece (19) is rotatably connected to the lower end of the butt joint base (2), and a torsion spring is butted against the axial end of the external protective piece (19) to support it.
4. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 3, characterized in that: The first airbag (4) supplies air to the interior of the second airbag (5) through the air delivery hose (3), so that the second airbag (5) expands and pushes the built-in nesting part (6) to move downward along the interior of the docking base (2).
5. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 4, characterized in that: During the downward movement of the built-in nesting part (6) under force, the first pull rope (7) drives the docking piston part (8) to move upward along the inner wall of the built-in nesting part (6) to form a negative pressure working state, and the docking piston part (8) cooperates with the first spring (9) to form an elastic structure along the interior of the built-in nesting part (6).
6. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 5, characterized in that: The built-in nesting member (6) is forced to move downward and simultaneously applies pressure to the nesting resistance member (18) at the lower end, so that it is pushed downward synchronously to the contacting external protective member (19) to start working, and the nesting resistance member (18) cooperates with the second pull rope (17) on the outside to drive the sealing docking member (15) to automatically expand along the inside of the preset channel (11).
7. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 3, characterized in that: The liquid storage structure is provided with a docking filter (10), and the docking filter (10) is fixedly docked to the inner side of the lower end of the built-in nesting member (6), and a preset conductive hose (13) is connected to the outer side of the lower end of the built-in nesting member (6), and a liquid storage cavity (12) is provided on the inner side of the lower end of the docking base (2), and the liquid storage cavity (12) and the preset conductive hose (13) are connected to each other, and the preset conductive hose (13) is bonded to a fitting docking member (14) inside, and a discharge channel (20) is provided at the lower end of the liquid storage cavity (12).
8. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 7, characterized in that: The liquid sucked from the interior of the built-in nested component (6) is filtered by the docking filter component (10) and then transferred to the interior of the liquid storage cavity (12) for storage processing in cooperation with the preset conductive hose (13). The pressed state of the fitting docking component (14) on the inner wall of the preset conductive hose (13) is deformed to break away from the fitting state, thereby achieving a connected state.
9. The anti-clogging self-dredging water conservancy water quality detection sampler according to claim 8, characterized in that: During the downward movement of the built-in nested component (6) under force, the preset conductive hose (13) on the side is simultaneously stretched downward, so that the liquid absorbed by the built-in nested component (6) in the connected state cannot be transmitted to the liquid storage cavity (12). When the built-in nested component (6) is reset, the liquid stored in the built-in nested component (6) in the high position will be filtered by the docking filter (10) and then transmitted to the liquid storage cavity (12) for sealed sampling processing in conjunction with the preset conductive hose (13).
Citation Information
Patent Citations
Underground water deep detection sampler
CN211317879U
Farmland irrigation water detection sampler
CN211347530U
Water quality sampler for hydrology and water conservancy
CN219302037U