A sampling device for laboratory water quality detection

Abstract

The utility model discloses a kind of sampling equipment for laboratory water quality detection belongs to water sample collection technical field, including fishing reel part, the side of fishing reel part is provided with control switch, the outside of fishing reel part is wound with fishing line, multiple sampling units are provided on fishing line, the bottom of sampling unit is equipped with counterweight unit. The utility model fishing reel part and control switch linkage, can be accurately adjusted the speed of fishing reel part and start-stop by control switch, avoid the problem that depth is difficult to control when traditional manual rope sampling, easy to shake, even non-professional operator can quickly master, reduce operation threshold, adapt to the complex environment of laboratory field sampling;Multiple sampling units are provided at the end of fishing line, multiple water samples can be collected simultaneously in a single release, without multiple round trip equipment, especially suitable for the experimental scene needing to compare different point, the same depth water quality data, greatly shorten sampling time consumption, improve experimental preparation efficiency.

Description

Technical Field

[0001] This utility model relates to a sampling device for laboratory water quality testing, belonging to the field of water sample collection technology. Background Technology

[0002] In the fields of environmental monitoring, ecological research and water quality safety assessment, laboratory water quality testing is one of the core technical means. As a key preliminary step in the testing process, water sample collection directly determines the accuracy and reliability of subsequent test data (such as heavy metal content, microbial concentration, chemical oxygen demand, etc.) as long as the collected water samples are accurate, uncontaminated, and highly representative.

[0003] Traditional laboratory water sampling equipment, such as common water samplers, can usually only collect water samples from a specific depth in a single operation. When it is necessary to obtain samples from multiple depths on a vertical profile of a water body, operators must repeatedly deploy, trigger, and retrieve the water sampler. This method has significant drawbacks: First, the operation process is cumbersome, time-consuming, and labor-intensive, resulting in low sampling efficiency. Second, multiple operations will cause continuous disturbance to the water body, and factors such as boat drift may cause the sampling points of water samples at different depths to not be strictly located on the same vertical profile, affecting the spatial representativeness and comparability of the sample data. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a sampling device for laboratory water quality testing.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A sampling device for laboratory water quality testing includes a fishing reel, a control switch on one side of the fishing reel, a fishing line wound around the outside of the fishing reel, multiple sampling units on the fishing line, and a counterweight unit at the bottom of each sampling unit.

[0006] Through the above technical solution, the fishing reel is the core of the equipment's launching and retracting drive. The control switch is linked to the fishing reel to control its start, stop, and speed. The fishing line is wrapped around the outside of the fishing reel, and multiple sampling units connected to its ends can enter the water synchronously as the fishing line is lowered. The counterweight unit at the bottom of the sampling unit generates a downward pulling force based on its own weight, balancing the buoyancy of the sampling unit in the water and driving the sampling unit to sink stably to the target sampling depth. At the same time, the fishing reel can adjust the position of the sampling unit in the water by launching and retracting the fishing line, realizing water quality sampling at different depths and in different areas.

[0007] The fishing reel is controlled by a switch to easily reel in and release the fishing line, allowing for precise adjustment of the sampling unit's position and reducing manual operation difficulty. Multiple sampling units enable simultaneous collection of multiple water samples in a single descent, improving sampling efficiency and making it suitable for experimental scenarios requiring comparison of water quality data from different locations. A counterweight unit ensures the sampling unit sinks stably to the target depth, preventing buoyancy-induced floating and guaranteeing accurate sampling depth, thus enhancing sample representativeness. The overall structure is simple, with strong interoperability among components, facilitating portability and on-site operation, and meeting the field sampling needs of laboratory water quality testing.

[0008] Preferably, the sampling unit includes a first threaded head, which is disposed on the fishing line. A top plate is disposed on one side of the first threaded head, and a second threaded head is disposed on the lower side of the top plate. A protective shell is disposed on one side of the second threaded head. A motor is disposed on the top inner side of the protective shell, a partition is disposed on the lower side of the motor, a ring-shaped battery is disposed on the upper side of the partition, a shield is disposed on the shaft end of the motor, and a water inlet is disposed on the outer side of the protective shell.

[0009] Through the above technical solution, the sampling unit is detachably connected to the end of the fishing line via a threaded head, and the top plate is fixed to the fishing line via the same threaded head. Simultaneously, a second threaded head on the underside of the top plate is threadedly connected to the protective shell, enabling detachable assembly of the protective shell and the top plate. The protective shell provides a protective space for the internal components. A partition divides the interior of the protective shell into upper and lower layers. The upper layer houses a ring-shaped battery, which provides power to the motor. The motor is fixed to the top of the inner side of the protective shell, and a shield connected to its shaft can rotate around the shaft as the motor starts and stops. When sampling is required, the motor drives the shield to rotate, causing it to align with the water inlet on the outside of the protective shell, allowing water to enter the interior of the protective shell through the inlet. After sampling is completed, the motor drives the shield to reset, covering the water inlet and preventing further water entry.

[0010] The threaded connection structure of threaded head one and threaded head two facilitates the assembly and disassembly of the sampling unit and fishing line, as well as the separation and maintenance of the protective shell and top plate, reducing the difficulty of equipment maintenance. The protective shell can effectively protect internal components such as motors and ring batteries from water impact and impurity collision damage, extending the service life of components. The ring battery adopts a ring structure, which can be adapted to the internal space of the protective shell, increasing the battery capacity within a limited volume, ensuring continuous power supply to the motor, and avoiding sampling interruption due to power failure during sampling. The motor-driven shielding component controls the opening and closing of the water inlet, realizing automated control of water sample collection, reducing water sample contamination caused by human intervention, and improving the accuracy of sampling timing.

[0011] Preferably, a water guide is provided inside the protective shell and below the shielding member, and a water injection head is provided in the middle of the lower side of the water guide. A base plate is threaded to the lower side of the protective shell, and a sampling tube is inserted into the upper side of the base plate. A tube cap is provided on the upper side of the sampling tube, and a one-way membrane of the heart valve structure is provided on the upper side of the tube cap. The water injection head passes through the one-way membrane of the heart valve structure and is configured to communicate with the sampling tube.

[0012] Through the above technical solution, the water guide located on the lower side of the shield inside the protective shell can guide the water entering through the inlet hole to the water injection head in the middle of its lower side; the lower side of the protective shell is threadedly connected to the bottom plate, and the sampling tube inserted into the upper side of the bottom plate is used to store water samples. The cap on the upper side of the sampling tube can seal the port of the sampling tube, and the one-way membrane of the heart valve structure on the upper side of the cap only allows water to pass through in one direction; when the water is guided to the water injection head through the water guide, the water injection head passes through the one-way membrane of the heart valve structure, and the water pushes open the one-way membrane under the action of water pressure and enters the sampling tube. After sampling is completed, the one-way membrane resets and closes under its own elasticity to prevent the water sample in the sampling tube from flowing back or external impurities from entering the sampling tube.

[0013] The combination of the water guide and the water injection head precisely guides water into the sampling tube, preventing water from stagnating inside the protective shell and improving water sample collection efficiency. The threaded connection between the base plate and the protective shell, and the plug-in structure between the sampling tube and the base plate, facilitates quick disassembly of the base plate and removal of the sampling tube after sampling, making operation convenient and reducing the risk of contamination during water sample transfer. The one-way conduction characteristic of the unidirectional membrane of the heart valve structure effectively prevents insufficient sampling volume caused by water sample backflow, while also preventing external water or impurities from entering the sampling tube and contaminating the water sample, ensuring the purity and accuracy of the collected water sample and meeting the water quality requirements of laboratory water quality testing.

[0014] Preferably, a water filter cylinder is provided between the bottom plate and the top plate and on the outside of the protective shell.

[0015] With the above technical solution, the filter cylinder between the bottom plate and the top plate and located on the outside of the protective shell can cover the water inlet on the outside of the protective shell. When the sampling unit sinks into the water, the water needs to be filtered by the filter cylinder to remove suspended impurities in the water before entering the interior of the protective shell through the water inlet to complete the subsequent water sample collection process.

[0016] The water filter cartridge effectively filters suspended impurities in the water, preventing them from clogging the inlet, guide, or injection head, ensuring unobstructed water flow within the equipment, and avoiding sampling failures due to component blockage. The filtered water enters the sampling tube, reducing the impurity content in the water sample, minimizing interference with subsequent laboratory water quality testing results, reducing water sample pretreatment steps, and improving testing efficiency. The filter cartridge is located outside the protective shell and positioned by the bottom and top plates, ensuring structural stability. It is also easy to disassemble, clean, or replace, and can be reused, reducing equipment operating costs.

[0017] Preferably, the counterweight unit includes a counterweight lead block, a connector, and a connecting groove. The connector is threaded to the lower side of the base plate, the counterweight lead block is disposed on the lower side of the connector, and the connecting groove is disposed on the lower side of the counterweight lead block. The connecting groove matches the connector.

[0018] Through the above technical solution, the counterweight unit is connected to the bottom plate by a threaded connection via a connector, thereby fixing the counterweight unit and the sampling unit. The counterweight lead block has a high density, and its own weight can provide downward traction for the sampling unit, causing the sampling unit to overcome the buoyancy of the water and sink. The connecting groove on the bottom of the counterweight lead block matches the structure of the connector. When it is necessary to add counterweight to meet the sampling needs of deeper water, the connector of another counterweight lead block can be inserted into the connecting groove of the existing counterweight lead block to realize the stacking and assembly of multiple counterweight lead blocks and adjust the overall counterweight weight.

[0019] The high-density, small-volume lead weight provides sufficient counterweight within a limited space, ensuring stable sinking of the sampling unit and preventing insufficient counterweight from preventing the sampling unit from reaching the target depth, thus improving the accuracy of sampling depth. The threaded connection between the connector and the base plate, and the matching structure between the connecting groove and the connector, facilitate the disassembly, assembly, and stacking of the lead weight. The weight can be flexibly adjusted according to different water depth requirements, adapting to various sampling scenarios such as shallow and deep water areas. The dual fixing method of threaded connection and groove matching ensures a firm connection between the lead weight unit and the sampling unit, preventing the lead weight from falling off during sampling and improving the safety of equipment use.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model's fishing reel component is linked with a control switch, which can precisely adjust the reel component's speed of retraction and detraction and its start and stop. This avoids the problems of difficulty in controlling depth and easy shaking when manually pulling ropes for sampling in traditional methods. Even non-professional operators can quickly master the operation, lowering the operating threshold and making it suitable for the complex environment of laboratory field sampling. Multiple sampling units are set at the end of the fishing line, which can collect multiple water samples at the same time in a single drop, eliminating the need for multiple round trips to retrieve and deploy the equipment. This is especially suitable for experimental scenarios that require comparison of water quality data at different locations and the same depth, greatly reducing sampling time and improving experimental preparation efficiency. The counterweight unit balances the buoyancy of the sampling unit in the water by its own weight, ensuring that the sampling unit can sink stably to the target detection depth, avoiding floating and drifting due to buoyancy, ensuring that the collected water sample is consistent with the experimental setting depth, improving the representativeness of the water sample, and laying the foundation for the accuracy of subsequent water quality test data. With high integration of components and simple structure, the fishing reel can be wrapped to store fishing line, reducing the space occupied by the equipment and making it easy for laboratory personnel to carry to field sampling points such as rivers and lakes, adapting to the needs of laboratory water quality testing in multiple scenarios. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the front axonometric structure of this utility model; Figure 2 This is a front-section axial side view of the present invention. Figure 3 For the present utility model Figure 2 A schematic diagram of the structure of A in the middle; Figure 4 This is a schematic diagram of the explosive frontal axial side structure of this utility model; Figure 5 This is a schematic diagram of the explosive bottom axial structure of this utility model.

[0023] In the diagram: 1. Fishing reel; 2. Control switch; 3. Fishing line; 4. Sampling unit; 41. Threaded head one; 42. Top plate; 43. Threaded head two; 44. Protective shell; 45. Motor; 46. Partition plate; 47. Ring battery; 48. Shielding component; 49. Water inlet; 410. Water guide component; 411. Water injection head; 412. Bottom plate; 413. Sampling tube; 414. Tube cap; 415. Filter cylinder; 5. Counterweight unit; 51. Counterweight lead block; 52. Connector; 53. Connecting groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This utility model provides a technical solution: A sampling device for laboratory water quality testing includes a fishing reel 1, a control switch 2, a fishing line 3, multiple sampling units 4, and a counterweight unit 5.

[0026] Fishing reel 1 adopts the existing fishery reel structure, and has a drive motor inside, which can realize the automatic winding and unwinding of fishing line 3; control switch 2 is installed on the side of fishing reel 1 and is electrically connected to the drive motor inside fishing reel 1, and is used to control the start, stop and speed of drive motor, thereby adjusting the winding and unwinding speed of fishing line 3. The fishing line 3 is made of high-strength nylon material. One end of it is wrapped around the reel disc of the fishing reel 1, and the other end is provided with three sampling units 4 at intervals along the length direction. Adjacent sampling units 4 are connected and fixed in series by the fishing line 3. Each sampling unit 4 is connected to a counterweight unit 5 at its bottom to balance the buoyancy of the sampling unit 4 in the water and ensure its stable sinking.

[0027] Each sampling unit 4 includes a threaded head 41, a top plate 42, a threaded head 43, a protective shell 44, a motor 45, a partition 46, a ring battery 47, a shield 48, a water inlet 49, a water guide 410, a water injection head 411, a bottom plate 412, a sampling tube 413, a tube cap 414, and a filter cylinder 415. The threaded head 41 is a cylindrical structure that is detachably connected to the fishing line 3, and its bottom is welded and fixed to the center of the upper surface of the top plate 42. The top plate 42 has a threaded head 43 integrally formed at the center of its surface, and the outer side of the threaded head 43 has an external thread; the protective shell 44 is a cylindrical hollow shell made of polytetrafluoroethylene, which is highly corrosion resistant, and its top inner side has an internal thread that matches the threaded head 43, and it is fixed to the top plate 42 through threaded connection. The partition 46 is a circular rubber plate, the edge of which is interference-fitted with the inner wall of the protective shell 44, dividing the interior of the protective shell 44 into upper and lower chambers. Motor 45 is a miniature waterproof stepper motor that is fixed to the top of the inner side of the protective shell 44 with bolts, and its output shaft extends through the partition 46 to the lower chamber; The ring-shaped battery 47 is a 3.7V rechargeable lithium battery that is sleeved on the outside of the motor 45, placed on the upper surface of the partition 46, and electrically connected to the motor 45 to supply power to it. The shield 48 is a circular rubber sheet, the center of which is welded and fixed to the output shaft of the motor 45. Its diameter is slightly larger than the inner diameter of the protective shell 44. It can cover or offset the water inlet hole 49 as the motor 45 rotates. There are 8 water inlet holes 49, which are evenly distributed along the circumference of the protective shell 44 on the middle outer wall, and the hole diameter is 5mm. The water guide 410 is an inverted cone-shaped structure made of plastic. Its top edge is bonded and fixed to the inner wall of the protective shell 44. It is located on the lower side of the shield 48. The bottom center has an integrally formed cylindrical hollow structure of water injection head 411 with an outer diameter of 3mm. The bottom outer side of the protective shell 44 is provided with external threads, which are threaded to the internal threaded hole on the edge of the upper surface of the base plate 412. A circular slot is provided at the center of the upper surface of the base plate 412. The sampling tube 413 is made of transparent glass and has a volume of 50mL. It is inserted into the slot. The top of the sampling tube 413 is threaded with a tube cap 414 (made of plastic). The tube cap 414 has a through hole in the center, and a one-way membrane of a heart valve structure (made of medical silicone material, which only allows liquid to flow in from the top in one direction) is fixed in the through hole. The lower end of the water injection head 411 passes through the center of the one-way membrane of the heart valve structure and communicates with the interior of the sampling tube 413; The filter cartridge 415 is a cylindrical mesh shell (made of stainless steel with a mesh pore size of 0.5mm). Its top is engaged with the lower edge of the top plate 42, and its bottom is engaged with the upper edge of the bottom plate 412. It is fitted onto the outside of the protective shell 44, completely covering the water inlet hole 49.

[0028] The counterweight unit 5 includes a lead weight 51, a connector 52, and a connecting groove 53. The connector 52 has a cylindrical structure and an external thread at the top, which is threaded to the internal thread hole at the center of the lower surface of the base plate 412. The counterweight lead block 51 is a cylindrical solid structure (with the same diameter as the base plate 412), and its top is welded and fixed to the bottom of the connector 52. The connecting groove 53 is a circular groove located at the center of the lower surface of the counterweight lead block 51. Its inner sidewall is provided with internal threads, which match the external threads of the connector 52, so that multiple counterweight lead blocks 51 can be stacked and connected.

[0029] In this embodiment, the ring battery 47 is sleeved on the outside of the motor 45 and fixed together inside the protective shell 44. The output shaft of the motor 45 passes through the partition 46 and is connected to the shield 48. The top plate 42 is connected to the top of the protective shell 44 through the second threaded head 43, and the fishing line 3 is connected to the top plate 42 through the first threaded head 41. Fix the water guide 410 inside the protective shell 44, and align the water injection head 411 downwards; Insert the sampling tube 413 into the slot of the base plate 412, cover it with the tube cap 414 with the one-way membrane, and then connect the base plate 412 to the bottom of the protective shell 44 with threads to ensure that the water injection head 411 passes through the one-way membrane. The filter cartridge 415 is snapped between the top plate 42 and the bottom plate 412, and the protective shell 44 is covered. Depending on the sampling depth requirements, 1-3 counterweight lead blocks 51 are connected below the base plate 412 through the cooperation of connector 52 and connecting groove 53.

[0030] Sampling operation: The operator holds the fishing reel 1 and starts the fishing reel 1 through the control switch 2, releasing the fishing line 3, so that multiple sampling units 4 sink under the gravity of the counterweight unit 5; When the fishing line 3 is lowered to the preset depth, the lowering is paused by controlling switch 2. The control switch 2 controls the motor 45 to start, which drives the shield 48 to rotate until it is offset from the water inlet 49. After the water is filtered by the filter cartridge 415, it enters the lower chamber of the protective shell 44 through the water inlet 49, and is guided to the water injection head 411 by the water guide 410, which pushes open the one-way membrane and flows into the sampling tube 413. Once sampling is complete, control motor 45 reverses, causing shielding component 48 to reset and cover water inlet hole 49, thus blocking water flow. By controlling switch 2 to start fishing reel 1 to retrieve fishing line 3, sampling unit 4 is pulled out of the water; Remove the base plate 412, take out the sampling tube 413, tighten the tube cap 414 to seal, and complete the water sample collection.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sampling device for laboratory water quality testing, comprising a fishing reel, wherein a control switch is provided on one side of the fishing reel, and fishing line is wound around the outside of the fishing reel, characterized in that, The fishing line is equipped with multiple sampling units, and each sampling unit has a counterweight unit at its bottom.

2. The sampling device for laboratory water quality testing according to claim 1, characterized in that, The sampling unit includes a threaded head one, which is disposed on the fishing line. A top plate is disposed on one side of the threaded head one, and a threaded head two is disposed on the lower side of the top plate. A protective shell is disposed on one side of the threaded head two. A motor is disposed on the top inner side of the protective shell, a partition is disposed on the lower side of the motor, a ring-shaped battery is disposed on the upper side of the partition, a shield is disposed on the shaft end of the motor, and a water inlet is disposed on the outer side of the protective shell.

3. The sampling device for laboratory water quality testing according to claim 2, characterized in that, A water guide is provided inside the protective shell and below the shielding member. A water injection head is provided in the middle of the lower side of the water guide. A base plate is threaded to the lower side of the protective shell. A sampling tube is inserted into the upper side of the base plate. A tube cap is provided on the upper side of the sampling tube. A one-way membrane of the heart valve structure is provided on the upper side of the tube cap. The water injection head passes through the one-way membrane of the heart valve structure and is configured to communicate with the sampling tube.

4. A sampling device for laboratory water quality testing according to claim 3, characterized in that, A water filter cylinder is installed between the bottom plate and the top plate, and on the outside of the protective shell.

5. A sampling device for laboratory water quality testing according to claim 1, characterized in that, The counterweight unit includes a counterweight lead block, a connector, and a connecting groove. The connector is threaded to the lower side of the base plate, the counterweight lead block is located on the lower side of the connector, and the connecting groove is located on the lower side of the counterweight lead block. The connecting groove matches the connector.

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