Water quality sampling and detecting device for large-water-surface ecological fishery
By combining a basic sampling device, a thermocline sampling device, and a bottom sampling device, along with a telescopic sleeve and a weight-adding device, the problem of water layer mixing pollution in large water surface water quality testing was solved, achieving efficient and accurate stratified sampling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-03-13
AI Technical Summary
Existing sampling devices are prone to mixed contamination of different water layers in large-scale water quality testing, leading to distorted test results. Furthermore, the sealing performance of stratified sampling devices is insufficient, posing a risk of cross-contamination.
The system employs a combination of basic sampling devices, thermocline sampling devices, and bottom sampling devices. Independent stratified sampling is achieved through telescopic sleeves, ensuring the independence and non-interference of samples from each water layer. The sampling process is controlled by a weighting device and a solenoid valve.
It enables simultaneous sampling of different water layers on a large water surface, avoiding mixed contamination, improving sampling efficiency and detection accuracy, and reducing learning costs.
Smart Images
Figure CN121655949A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water quality testing technology, and in particular to a water quality sampling and testing device for large-scale ecological fisheries. Background Technology
[0002] Large-scale ecological fisheries (encompassing reservoirs, lakes, and large-scale aquaculture ponds, typically defined as water areas ≥ 100 mu (approximately 6.7 hectares) and depths ≥ 2 meters) are an important component of aquaculture in my country. Their water quality directly affects the yield, quality, and ecological balance of aquatic products. Water quality monitoring, as a core element of refined fisheries management, requires precise sampling to obtain data on key indicators such as dissolved oxygen, pH, ammonia nitrogen, and nutrients, providing a scientific basis for aquaculture decisions and pollution control. Large-scale water bodies, influenced by factors such as temperature, light, and density, naturally form stable vertical stratification structures, typically divided into surface water, thermocline, and bottom water. The physicochemical properties of each water layer differ significantly: surface water is affected by sunlight and air exchange, resulting in high dissolved oxygen content and large temperature fluctuations; the thermocline, as a transition zone, experiences a rapid temperature drop of 2-5°C within a short depth, forming a "density barrier" that hinders the exchange of substances between upper and lower water layers; the bottom water has a low and stable temperature, low dissolved oxygen content (easily forming an oxygen-deficient "dead water layer" in summer), and due to the release of nutrients from the bottom sediment, the concentrations of indicators such as ammonia nitrogen and total phosphorus are significantly higher than those in the surface layer. This stratification characteristic dictates that water quality sampling must accurately correspond to the target water layer to truly reflect the overall water quality of the area and avoid misjudgments due to sample distortion.
[0003] Most existing sampling devices have open inlets. During descent and ascent, water flow disturbances can cause water from different layers to enter the sampling chamber, resulting in mixing of water samples between layers. For example, when a conventional water sampler is raised from the bottom to the surface, surface water can seep into the chamber through the inlet, leading to higher readings for dissolved oxygen and other indicators in the bottom water sample, with an error rate exceeding 30%. Although some stratified water samplers are equipped with multi-channel sampling structures, the sealing performance between channels is insufficient, still posing a risk of cross-contamination. Summary of the Invention
[0004] The purpose of this invention is to address the problems existing in the background art by proposing a water quality sampling and testing device for large-scale ecological fisheries.
[0005] The technical solution of the present invention: A water quality sampling and testing device for large-scale ecological fisheries, comprising a base sampling device, a thermocline sampling device, and a bottom sampling device fixed on a platform. The thermocline sampling device consists of a base sampling device and at least one telescopic sleeve, wherein the base sampling device is movably fitted inside the telescopic sleeve. The bottom sampling device consists of a thermocline sampling device and at least one telescopic sleeve, wherein the telescopic sleeve of the thermocline sampling device is movably fitted inside the telescopic sleeve of the bottom sampling device. The basic sampling device includes a housing, a seat and a piston plate that can slide inside the housing. The piston plate is located above the seat. A sampling pipe is fixedly installed inside the piston plate. The sampling pipe is fixed and connected to a flexible hose. An extraction pipe is fixedly installed inside the seat. The sampling pipe and the extraction pipe are located on the same horizontal line. The thermocline sampling device is fitted inside the telescopic tube through the housing.
[0006] Preferably, the basic sampling device is fixedly connected to the outer shell and the platform, the thermocline sampling device and the bottom sampling device are both fixedly connected to the platform through telescopic sleeves, the platform is composed of a float plate and a configuration plate, the float plate is located above the configuration plate, and the basic sampling device and the telescopic sleeve both penetrate the configuration plate and are at a distance from the top of the float plate.
[0007] Preferably, the base body is provided with a slot, and the basic sampling device is also provided with a weight-increasing device. The weight-increasing device includes a weight-increasing box fixed in the outer shell, and a receiving box installed in the slot. The receiving box includes a mounting column, which is located close to the weight-increasing box. The weight-increasing box has an outlet, and weight-increasing balls are provided inside the weight-increasing box. The weight of each weight-increasing ball provided in the basic sampling device, the thermocline sampling device, and the bottom sampling device gradually increases.
[0008] Preferably, the weight-adding device further includes a push rod fixedly installed at the bottom of the piston plate, the push rod and the chamber of the weight-adding box are located on the same horizontal line, the sampling pipe is provided through the piston plate, the length of the sampling pipe below the piston plate is greater than the length of the push rod, and a docking sleeve is fixedly installed on the seat.
[0009] Preferably, the weight-adding box has an inlet, the outlet is located at the bottom of the weight-adding box, the inlet is located in the upper half of the weight-adding box, the weight-adding ball is located below the inlet, and the bottom of the weight-adding box is provided with an arc-shaped ramp.
[0010] Preferably, the outlet is provided with a bottom-opening gate, the bottom-opening gate is provided with a torsion spring at the mounting location, the bottom-opening gate opens from above, the bottom-opening gate is provided with an inclined part located below the receiving box, and a stop seat located on the inlet side is fixedly installed on the weight-adding box, the stop seat being located above the receiving box.
[0011] Preferably, a pressing block is slidably installed at the end of the side wall of the receiving box, and a pressing switch is provided on the side of the pressing block and mounted on the base. The end of the base is provided with a bottom sealing seat for fixing the bottom of the outer shell, and a solenoid valve is installed on the bottom sealing seat. The solenoid valve and the pressing switch are electrically connected.
[0012] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention uses a basic sampling device, a thermocline sampling device, and a bottom sampling device to form a sampling and detection device. The thermocline sampling device and the bottom sampling device are formed by adding telescopic sleeves to the basic sampling device, so the operation methods are consistent and the learning cost can be reduced. In addition, this invention realizes simultaneous sampling of different water layers on a large water surface, and the sampling does not interfere with each other, reducing the risk of mixed pollution. Each sampling process is actually independent. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention in use; Figure 3 This is a schematic diagram of the basic sampling device of the present invention; Figure 4 This is a cross-sectional structural diagram of the basic sampling device of the present invention; Figure 5 This is a schematic diagram of the weight-adding device of the present invention; Figure 6 This is a schematic diagram of the structure of the weight-adding ball of the present invention; Figure 7 This is a schematic diagram of the pressing block of the present invention.
[0014] Reference numerals: 1. Basic sampling device; 2. Thermocline sampling device; 3. Bottom sampling device; 4. Platform; 41. Float; 42. Configuration plate; 5. Weighting device; 6. Solenoid valve; 7. Push-button switch; 8. Bottom sealing seat; 9. Pressing block; 11. Outer shell; 12. Seat; 121. Slot; 122. Connecting sleeve; 13. Piston plate; 14. Sampling pipe; 15. Extraction pipe; 16. Conical mesh sleeve; 51. Weighting box; 52. Receiving box; 53. Weighting ball; 54. Push rod; 55. Outlet; 56. Inlet; 57. Chamber; 58. Bottom-opening gate; 59. Baffle seat; 100. Flexible hose; 200. Water inlet; 300. Telescopic sleeve; 400. Rubber sleeve; 500. Mounting column. Detailed Implementation
[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0016] Example 1, refer to Appendix Figures 1-7A water quality sampling and testing device for large-scale ecological fisheries includes a base sampling device 1, a thermocline sampling device 2, and a bottom sampling device 3 fixed on a platform 4. The thermocline sampling device 2 consists of the base sampling device 1 and at least one telescopic sleeve 300. The base sampling device 1 is movably fitted inside the telescopic sleeve 300. The bottom sampling device 3 consists of a thermocline sampling device 2 and at least one telescopic sleeve 300. The telescopic sleeve 300 of the thermocline sampling device 2 is movably fitted inside the telescopic sleeve 300 of the bottom sampling device 3. The basic sampling device 1 includes a housing 11, a seat 12 that can slide within the housing 11, and a piston plate 13. The piston plate 13 is located above the seat 12. A sampling pipe 14 is fixedly installed inside the piston plate 13. The sampling pipe 14 is fixedly connected to a flexible hose 100. An extraction pipe 15 is fixedly installed inside the seat 12. The sampling pipe 14 and the extraction pipe 15 are located on the same horizontal line. The thermocline sampling device 2 is fitted inside the telescopic sleeve 300 through the housing 11.
[0017] Existing sampling devices are often integrated units, which can easily lead to mixed contamination during stratified sampling, resulting in distorted test results. Furthermore, large bodies of water naturally form stable vertical stratification structures due to factors such as temperature, light, and density, typically divided into surface water, thermocline, and bottom water, each with significantly different physicochemical properties. Integrated units, when descending in stratified layers, can also easily allow water to seep into the chamber.
[0018] The sampling and detection device of the present invention consists of a basic sampling device 1, a thermocline sampling device 2, and a bottom sampling device 3, which enables it to independently target the surface water, thermocline, and bottom water of a large water body, allowing for simultaneous individual sampling of each water layer, improving sampling efficiency and avoiding mixed contamination.
[0019] Specifically, the present invention uses the basic sampling device 1 as the core equipment. The thermocline sampling device 2 and the bottom sampling device 3 both extend the diving depth of the basic sampling device 1 by increasing the number of telescopic sleeves 300. In addition, the setting of the telescopic sleeves 300 can also avoid mixing between different water layers and separate the sampling operations of each water layer in sequence.
[0020] Before use, the sampling point can be reached by a fishing boat. Each hose 100 is connected to a pump body placed on the fishing boat. The length of each hose 100 must meet the diving depth of its sampling device. Excess hoses 100 can be wound up on a winding roller. The operation then begins. The device is placed on the water surface, and the platform 4 will absorb some water, making it level with the water surface. At this time, the basic sampling device 1, the thermocline sampling device 2, and the bottom sampling device 3 will be underwater. When the basic sampling device 1 is used, water will flow from the water surface into the outer shell 11. The top of the outer shell 11 is the water inlet 200. Water will enter the outer shell 11 through the water inlet 200. The weight of the water will press down on the piston plate 13, causing the piston plate 13 to move towards the seat 12, so that the sampling pipe 14 will be inserted into the extraction pipe 15. As the sampling pipe 14 moves down, it will also push the seat 12 to move down to the bottom of the outer shell 11, so that the extraction pipe 15 enters into the conical mesh sleeve 16. Then, the pump connected by the hose 100 is started to pump water for sampling.
[0021] When the thermocline sampling device 2 and the bottom sampling device 3 are in operation, since both the thermocline sampling device 2 and the bottom sampling device 3 include the basic sampling device 1, the specific sampling methods of the thermocline sampling device 2 and the bottom sampling device 3 are the same as those of the basic sampling device 1. The only difference is that the thermocline sampling device 2 and the bottom sampling device 3 increase the depth of entry into the water surface by using a telescopic sleeve 300, which can meet the requirements of stratified sampling of different water layers. Specifically, during the operation of the thermocline sampling device 2, a rubber sleeve 400 is installed inside the telescopic sleeve 300. When the weight inside the base sampling device 1 does not increase, there is friction between the base sampling device 1 and the rubber sleeve 400, preventing the base sampling device 1 from descending. However, as water enters the base sampling device 1, the weight of the base sampling device 1 increases, causing it to slide down from the telescopic sleeve 300 and exit. Water also continuously enters the telescopic sleeve 300, ensuring sufficient pressure for the base sampling device 1 to operate normally. During the operation of the bottom sampling device 3, the operating steps of the thermocline sampling device 2 are repeated, except that as water continuously enters the base sampling device 1 and the telescopic sleeve 300, the telescopic sleeve 300 will also exit from its sleeve.
[0022] like Figure 2 As shown, this diagram illustrates the device operating underwater, compared to... Figure 1 Both the thermocline sampling device 2 and the bottom sampling device 3 are deployed during use, ensuring that the base sampling device 1, the thermocline sampling device 2, and the bottom sampling device 3 can reach different water depths, and that the three operate without interfering with each other. Then, the pumps connected by each hose 100 are started to perform sampling and pumping operations. The conical mesh sleeve 16 prevents the intake of impurities.
[0023] In this embodiment, as Figure 2 As shown, the basic sampling device 1 is fixedly connected to the outer shell 11 and the platform 4. The thermocline sampling device 2 and the bottom sampling device 3 are both fixedly connected to the platform 4 through the telescopic sleeve 300. The platform 4 consists of a float plate 41 and a configuration plate 42. The float plate 41 is located above the configuration plate 42. The basic sampling device 1 and the telescopic sleeve 300 both penetrate the configuration plate 42 and are at a distance from the top of the float plate 41.
[0024] When the device is placed on the water surface, the platform 4 is composed of a float plate 41 and a configuration plate 42. This ensures that the configuration plate 42 can sink while the float plate 41 floats on the water surface, thus ensuring that the platform 4 is flush with the water surface. Furthermore, the base sampling device 1, the thermocline sampling device 2, and the bottom sampling device 3 form a concave design. Subsequently, the water surface ripples, and water enters the outer shell 11.
[0025] When this device is in use, since the basic sampling device 1, the thermocline sampling device 2 and the bottom sampling device 3 all need to operate underwater, considering the effect of water pressure and the need for the thermocline sampling device 2 and the bottom sampling device 3 to travel a long distance, the driving force of the base 12 needs to be increased to ensure its normal operation.
[0026] In Example 2, based on Example 1, the base 12 has a slot 121, and the basic sampling device 1 also has a weight-increasing device 5. The weight-increasing device 5 includes a weight-increasing box 51 fixed in the outer shell 11, and a receiving box 52 installed in the slot 121. The receiving box 52 includes a mounting post 500, which is rotatably installed in the slot 121 and is provided with a torsion spring. The mounting post 500 is located close to the weight-increasing box 51. The weight-increasing box 51 has an outlet 55, and a weight-increasing ball 53 is provided in the weight-increasing box 51. The weight of each weight-increasing ball 53 in the basic sampling device 1, the thermocline sampling device 2, and the bottom sampling device 3 gradually increases.
[0027] Specifically, the weight-increasing device 5 also includes a push rod 54 fixedly installed at the bottom of the piston plate 13. The push rod 54 and the chamber 57 of the weight-increasing box 51 are on the same horizontal line. The sampling pipe 14 is installed through the piston plate 13. The length of the sampling pipe 14 below the piston plate 13 is greater than the length of the push rod 54. A docking sleeve 122 is fixedly installed on the seat 12. The weight-increasing box 51 has an inlet 56 and an outlet 55 located at the bottom of the weight-increasing box 51. The inlet 56 is located in the upper half of the weight-increasing box 51. The weight-increasing ball 53 is located below the inlet 56. The bottom of the weight-increasing box 51 is provided with an arc-shaped ramp. The outlet 55 is provided with a downward-opening stop 58. A torsion spring is provided at the installation location of the downward-opening stop 58. The downward-opening stop 58 opens from above. The downward-opening stop 58 is provided with an inclined part located below the receiving box 52. A stop seat 59 located on the side of the inlet 56 is fixedly installed on the weight-increasing box 51. The stop seat 59 is located above the receiving box 52.
[0028] In this embodiment, it should be noted that the operation methods of the basic sampling device 1, the thermocline sampling device 2, and the bottom sampling device 3 are the same as described above. Therefore, in this embodiment, only the basic sampling device 1 is used as an example for specific operation. After water enters the outer casing 11 through the inlet 200, the weight of the water will push the piston plate 13 down towards the seat 12, causing the sampling pipe 14 to be inserted into the docking sleeve 122. A rubber sealing gasket is provided between the seat 12 and the wall of the outer casing 11, and the rubber sealing gasket is located below the bottom of the seat 12 of the outer casing 11. Therefore, when the seat 12 descends, it will contact the rubber sealing gasket, thereby increasing the frictional resistance. However, the rubber sealing gasket is only provided at the bottom part of the seat 12 and is fixed to the outer casing 11. Therefore, when the piston plate 13 moves, the sampling pipe 14 is inserted into the docking sleeve 122, pushing the seat 12 down. As the seat 12 descends, it causes the receiving box 52 to descend as well. During its descent, the receiving box 52 contacts the inclined part of the downward-opening stop 58, allowing the receiving box 52 to push against this part, thus opening the downward-opening stop 58. Furthermore, the descent of the piston plate 13 also causes the push rod 54 to enter the weight-adding box 51. The weight-adding box 51 presses down on the uppermost weight-adding ball 53, causing the bottommost weight-adding ball 53 to push outwards to open the downward-opening stop 58. Thus, the downward-opening stop 58 opens under the action of two forces. At this time, the receiving box 52 corresponds exactly to the outlet 55. When the weight-adding ball 53 moves from the arc-shaped ramp at the bottom of the weight-adding box 51 into the receiving box 52, and because the mounting column 500 of the receiving box 52 is set close to the weight-adding box 51, the receiving box 52 is tilted. The receiving box 52 is higher near the weight-adding box 51 and lower at the other end. Therefore, the weight-adding ball 53 will move to the bottom of the receiving box 52, thereby increasing the weight inside the seat 12, allowing the seat 12 to continue to descend. At this time, the inclined part of the downward-opening door 58 will not obstruct the receiving box 52. The inclined part is made of deformable rubber.
[0029] After the operation is completed, the device is removed from underwater, the water inside is drained, and then the winding roller of the hose 100 is activated, or the hose 100 is manually pulled. This causes the base 12 and sampling pipe 14 to rise. During the rise, the push rod 54 emerges from the weight-adding box 51, and the base 12 moves towards the stop 59. As it moves, the receiving box 52 abuts against the stop 59, causing the receiving box 52 to change its tilt direction. This results in the receiving box 52 being lower near the weight-adding box 51 and higher at the other end. This allows the outlet 55 to pour out from the receiving box 52 through the inlet 56 into the weight-adding box 51, and the downward-opening stop 58 will close the outlet 55 again as the force dissipates. This prepares the device for the next operation.
[0030] Example 3, based on Example 1 or 2 above, with reference to Figure 5 and Figure 7 A pressing block 9 is slidably installed at the end of the side wall of the receiving box 52. A pressing switch 7 is installed on the side of the pressing block 9 and mounted on the seat 12. A bottom sealing seat 8 is fixedly installed at the end of the seat 12 and a solenoid valve 6 is installed on the bottom sealing seat 8. The solenoid valve 6 and the pressing switch 7 are electrically connected.
[0031] In this embodiment, the above-mentioned setting is added to ensure that water will not enter the outer casing 11 from the bottom after the device enters the water and to ensure that the outer casing 11 is not impacted by the bottom water pressure. Therefore, a bottom sealing seat 8 is set. When the seat body 12 moves to the bottom sealing seat 8, the solenoid valve 6 is closed, so water will not enter. As the seat body 12 moves down, after the weight ball 53 enters the receiving box 52, the weight ball 53 moves to the end of the receiving box 52 and squeezes the pressing block 9. The pressing block 9 is squeezed and will continuously press the pressing switch 7, so that the pressing switch 7 will activate the solenoid valve 6 to open. The extraction tube 15 will pass through the solenoid valve 6, so that it can come into contact with the water that has entered the conical mesh sleeve 16, so that sampling can be performed.
[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A water quality sampling and testing device for large-scale ecological fisheries, characterized in that, The device includes a base sampling device (1), a thermocline sampling device (2), and a bottom sampling device (3) fixed on a table (4). The thermocline sampling device (2) consists of the base sampling device (1) and at least one telescopic sleeve (300). The base sampling device (1) is movably fitted inside the telescopic sleeve (300). The bottom sampling device (3) consists of a thermocline sampling device (2) and at least one telescopic sleeve (300). The telescopic sleeve (300) of the thermocline sampling device (2) is movably fitted inside the telescopic sleeve (300) of the bottom sampling device (3). The basic sampling device (1) includes a housing (11), a seat (12) that can slide inside the housing (11), and a piston plate (13). The piston plate (13) is located above the seat (12). A sampling pipe (14) is fixedly installed inside the piston plate (13). The sampling pipe (14) is fixed and connected to a hose (100). An extraction pipe (15) is fixedly installed inside the seat (12). The sampling pipe (14) and the extraction pipe (15) are located on the same horizontal line. The thermocline sampling device (2) is fitted inside the telescopic sleeve (300) through the housing (11).
2. The water quality sampling and testing device for large-scale ecological fisheries according to claim 1, characterized in that, The basic sampling device (1) is fixedly connected to the outer shell (11) and the platform (4). The thermocline sampling device (2) and the bottom sampling device (3) are both fixedly connected to the platform (4) through the telescopic sleeve (300). The platform (4) is composed of a float plate (41) and a configuration plate (42). The float plate (41) is located above the configuration plate (42). The basic sampling device (1) and the telescopic sleeve (300) both penetrate the configuration plate (42) and are at a distance from the top of the float plate (41).
3. The water quality sampling and testing device for large-scale ecological fisheries according to claim 1, characterized in that, The base (12) is provided with a slot (121), and the basic sampling device (1) is also provided with a weight-increasing device (5). The weight-increasing device (5) includes a weight-increasing box (51) fixed in the outer shell (11) and a receiving box (52) installed in the slot (121). The receiving box (52) includes a mounting column (500). The mounting column (500) is set close to the weight-increasing box (51). The weight-increasing box (51) has an outlet (55). The weight-increasing box (51) is provided with a weight-increasing ball (53). The weight of each weight-increasing ball (53) provided in the basic sampling device (1), the thermocline sampling device (2) and the bottom sampling device (3) gradually increases.
4. The water quality sampling and testing device for large-scale ecological fisheries according to claim 3, characterized in that, The weight-increasing device (5) also includes a push rod (54) fixedly installed at the bottom of the piston plate (13). The push rod (54) and the chamber (57) of the weight-increasing box (51) are located on the same horizontal line. The sampling pipe (14) is installed through the piston plate (13). The length of the sampling pipe (14) below the piston plate (13) is greater than the length of the push rod (54). A docking sleeve (122) is fixedly installed on the seat (12).
5. The water quality sampling and testing device for large-scale ecological fisheries according to claim 4, characterized in that, The weight-increasing box (51) has an inlet (56), the outlet (55) is located at the bottom of the weight-increasing box (51), the inlet (56) is located in the upper half of the weight-increasing box (51), the weight-increasing ball (53) is located below the inlet (56), and the bottom of the weight-increasing box (51) is provided with an arc-shaped ramp.
6. The water quality sampling and testing device for large-scale ecological fisheries according to claim 5, characterized in that, The outlet (55) is provided with a downward opening door (58), and a torsion spring is provided at the installation location of the downward opening door (58). The downward opening door (58) opens from the top. The downward opening door (58) is provided with an inclined part located below the receiving box (52). A stop (59) located on the side of the inlet (56) is fixedly installed on the weight-adding box (51). The stop (59) is located above the receiving box (52).
7. The water quality sampling and testing device for large-scale ecological fisheries according to claim 3, characterized in that, A pressing block (9) is slidably installed at the end of the side wall of the receiving box (52). A pressing switch (7) is installed on the side of the pressing block (9) and mounted on the seat (12). A bottom sealing seat (8) is fixedly installed at the end of the seat (12) and a solenoid valve (6) is installed on the bottom sealing seat (8). The solenoid valve (6) and the pressing switch (7) are electrically connected.