A sampling device applied to water quality detection

Abstract

The application relates to the technical field of water quality detection and discloses a sampling device applied to water quality detection. The sampling device can continuously dive to different depths to complete sampling of water samples at different depths through cooperation of a winding device, a diving cage, a diving water pump and multiple sampling tubes, and the sampling device can continuously dive to perform sampling after completing sampling at one depth without being lifted, so that the problem of low efficiency caused by repeated lifting is reduced. During sampling, the diving water pump provides negative pressure to continuously draw water samples at the depth into the sampling tube and flush the inner cavity of the sampling tube, and then the first electromagnetic valve and the second electromagnetic valve are closed to keep the sampling tube in a closed state, so that water sample pollution can be effectively avoided. In the application, whether the winding device is lowered to a specific detection depth is determined according to fluctuation of a detection value of a pressure sensor, so that wireless linkage cooperation of the water surface winding device and the underwater sampling device is realized.

Description

Technical Field

[0001] This application relates to the field of water quality testing technology, specifically to a sampling device used in water quality testing. Background Technology

[0002] Rivers are the source of drinking water in many regions, and water pollution (such as heavy metals, bacteria, and chemical pollutants) can directly endanger human health. Deteriorating water quality can also lead to the death of fish and aquatic plants, and disrupt the ecological balance (e.g., algal blooms deplete oxygen in the water). Industrial wastewater and pesticide / fertilizer discharges into rivers need to be monitored in real time to prevent illegal discharge. Therefore, water quality testing of rivers is essential.

[0003] Water quality testing is divided into laboratory testing and online testing equipment testing. Laboratory testing involves three steps: manual water sample collection, transportation to the laboratory, and chemical analysis. During manual water sample collection, due to the uneven distribution of water quality in rivers, and the varying pollutant concentrations at different depths due to factors such as sunlight, temperature, and water flow, it is necessary to sample water from different depths at the same location. Currently, the sampling process requires lowering sampling tubes one by one, which is cumbersome and carries the risk of sample contamination. Utility Model Content

[0004] In view of the above problems, this application provides a sampling device for water quality testing, which can effectively reduce the breakage rate of eggs during the washing and sterilization process, and integrates washing and sterilization steps into one unit. The device has a simple structure and low cost.

[0005] According to one aspect of the embodiments of this application, a sampling device for water quality testing is provided. The sampling device for water quality testing includes a sampling vessel with a raised platform at its midsection. A sampling well extending vertically to the bottom of the sampling vessel is provided at the platform. A winding device is provided above the sampling well, and a first PLC controller is electrically connected to the winding device. The winding device is connected to a submersible cage via a hinged rope. The sampling device is installed inside the submersible cage, and a pressure sensor is fixed to the submersible cage. The sampling device includes a submersible pump and a sealed box. The inlet of the submersible pump is connected to multiple negative pressure pipes via a multi-port connector. The end of the negative pressure pipe is connected to a sampling tube via a first solenoid valve. An inlet is provided at the end of the sampling tube away from the first solenoid valve, and a second solenoid valve is provided at the inlet. A battery and a second PLC controller are installed inside the sealed box. The battery is electrically connected to the submersible pump, and the second PLC controller is electrically connected to the multiple first solenoid valves, the multiple second solenoid valves, and the pressure sensor.

[0006] In some embodiments, the winding device includes a reel rotatably mounted above the sampling well via a support frame, the hinge rope being wound around the reel, a driven sprocket being coaxially connected to one end of the reel, a rotating motor being provided on one side of the reel, a driving sprocket being connected to the output end of the rotating motor, and the driving sprocket and the driven sprocket being connected by a chain link drive.

[0007] In some embodiments, a filter screen is connected to the inlet of the sampling tube.

[0008] In some embodiments, a door is provided on one side of the diving cage, and a locking mechanism is provided at the door.

[0009] In some embodiments, the bottom plate of the diving cage is a stainless steel plate, the top of the stainless steel plate is provided with a slide rail, the bottom plate of the sealing box is provided with a slide groove corresponding to the slide rail, and the sealing box is slidably connected to the slide rail through the slide groove, and the slide groove and the slide rail are fixed by screws.

[0010] In some embodiments, a plurality of counterweights are detachably provided on the bottom plate of the diving cage.

[0011] The beneficial effects of this application are as follows: By setting up a winding device, a diving cage, a submersible pump, and multiple sampling tubes working together, this device can continuously dive to different depths to collect water samples at different depths. After completing a sampling at one depth, the device does not need to be raised and can continue to dive for sampling, reducing the inefficiency caused by repeated lifting. During the sampling process, the submersible pump provides negative pressure to draw water samples from that depth into the sampling tube and flush the inner cavity of the sampling tube. Subsequently, the first and second solenoid valves are closed to keep the sampling tube in a closed state, thereby effectively preventing water sample contamination. This application also sets up a pressure sensor and a second PLC controller to work together. By detecting fluctuations in the pressure sensor value, it determines whether the winding device has reached a specific detection depth, thereby achieving wireless linkage between the surface winding device and the underwater sampling device.

[0012] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0013] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the device provided in the embodiments of this application; Figure 2 This is a partial structural diagram of the diving cage provided in an embodiment of this application; Figure 3 This is a schematic diagram of the bottom structure of the diving cage provided in an embodiment of this application; Figure 4 This is a partial structural diagram of the sampling tube and its connection provided in an embodiment of this application.

[0014] The reference numerals in the detailed embodiments are as follows: The sampling equipment 100 used for water quality testing includes a sampling boat 110, a boss 111, a sampling well 112, a winding device 120, a winding wheel 121, a driven sprocket 122, a rotating motor 123, a driving sprocket 124, a chain link 125, a hinge rope 130, a submersible cage 140, a pressure sensor 141, a door 142, a locking mechanism 143, a slide rail 144, a sampling device 150, a submersible pump 151, a sealed box 152, a chute 152a, a multi-port connector 153, a negative pressure pipe 154, a first solenoid valve 155, a sampling tube 156, a water inlet 157, a second solenoid valve 157a, a filter screen 158, and a counterweight 159. Detailed Implementation

[0015] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0016] For details, please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the overall structure of the device provided in an embodiment of this application. Figure 2 This is a partial structural diagram of the diving cage provided in an embodiment of this application. Figure 3 This is a schematic diagram of the bottom structure of the diving cage provided in an embodiment of this application. Figure 4This is a partial structural diagram of the sampling tube and its connection provided in an embodiment of this application. The sampling equipment 100 for water quality testing includes a sampling vessel 110. The sampling vessel 110 is existing equipment and can be either manned or unmanned. The sampling vessel 110 can be moved to the sampling area and is equipped with detection equipment such as a sonar detector. The middle part of the sampling vessel 110 protrudes upward to form a boss 111. A sampling well 112 is vertically opened at the boss 111, extending to the bottom of the sampling vessel 110. The sampling well 112 is the same size as the diving cage 140. During the movement of the sampling vessel 110, the diving cage 140 will be located in the sampling well 112, thus providing a certain degree of protection for the diving cage 140. On the other hand, the diving cage 140 can be lifted upward from the sampling well 112 and taken out onto the deck of the vessel. A winding device 120 is installed above the sampling well 112. The winding device 120 is electrically connected to a first PLC controller. The winding device 120 is connected to a submersible cage 140 via a hinged rope 130. The winding device 120 is used to raise the submersible cage 140 or gradually lower it to a corresponding depth below the water surface via the hinged rope 130. A sampling device 150 is installed inside the submersible cage 140, used to extract water samples from different depths in the river. A pressure sensor 141 is fixed to the submersible cage 140, which detects changes in water pressure and transmits electrical signals to the second PLC controller. The sampling device 150 includes a submersible pump 151 and a sealed housing 152. The submersible pump 151 can be a Jebao DC-1200 model. Both the first solenoid valve 155 and the second solenoid valve 157a can be submersible solenoid valves with an IP68 protection rating. The inlet of the submersible water pump 151 is connected to multiple negative pressure pipes 154 via a multi-port connector 153. The end of each negative pressure pipe 154 is connected to a sampling pipe 156 via a first solenoid valve 155. An inlet 157 is located at the end of the sampling pipe 156 furthest from the first solenoid valve 155. A second solenoid valve 157a is located at the inlet 157. When sampling is required, both the first solenoid valve 155 and the second solenoid valve 157a at the corresponding sampling pipe 156 are open. The first solenoid valve 155 and the second solenoid valve 157a at the sampling tube 156 will be closed. At this time, a passage will be formed between the sampling tube 156 and the submersible pump 151. The water sample flows sequentially from the inlet 157 of the sampling tube 156 through the sampling tube 156 and then flows out from the submersible pump 151 and circulates. After a period of time, the submersible pump 151 stops, and the first solenoid valve 155 and the second solenoid valve 157a close. At this time, the sampling tube 156 will have completed sampling. A battery and a second PLC controller are installed in the sealed box 152. The battery is electrically connected to the submersible pump 151, and the second PLC controller is electrically connected to multiple first solenoid valves 155, multiple second solenoid valves 157a, and pressure sensor 141. The second PLC controller is used to synchronously control the first solenoid valves 155, the second solenoid valves 157a, and the pressure sensor 141.

[0017] In this embodiment, the working process is as follows: the sampling vessel 110 is driven to a specific sampling area and stopped. The submersible cage 140 is lowered via the winding device 120, and the second PLC controller is activated. The submersible cage 140 is lowered to a certain water depth and then stops. This stopped state will last for 15-20 minutes. The pressure sensor 141 detects changes in water pressure. Initially, as the submersible cage 140 descends, the reading of the pressure sensor 141 fluctuates and continuously increases. However, when the submersible cage 140 stops descending, the reading of the pressure sensor 141 will fluctuate up and down (the submersible cage 140 will shake due to the water flow, resulting in unstable readings). The pressure sensor 141 transmits this reading to the second PLC controller. After the second PLC controller detects that the reading of the pressure sensor 141 is in a stable fluctuation state for a period of time (usually 2-5 minutes) and the average value of the detection no longer increases linearly, it can be determined that the diving cage 140 has reached the first detection depth. Subsequently, the second PLC control box controls the submersible water pump 151 and the first solenoid valve 155 and the second solenoid valve 157a at the corresponding sampling tube 156 to open for sampling. Then the winding device 120 is opened again, and the diving cage 140 further dives to the second detection depth and extracts water samples. This cycle is repeated until all depths of sampling are completed. Then the winding device 120 lifts the diving cage 140 to the sampling well 112 and returns it to the shore to retrieve the samples.

[0018] As can be seen from the above, in this embodiment, by setting up a winding device 120, a diving cage 140, a submersible pump 151, and multiple sampling tubes 156 to work together, the device can continuously dive to different depths to collect water samples at different depths. After completing a sampling at one depth, the device does not need to be lifted and can continue to dive for sampling, reducing the inefficiency caused by repeated lifting. During the sampling process, the submersible pump 151 provides negative pressure to draw water samples from that depth into the sampling tube 156 and flush the inner cavity of the sampling tube 156. Then, the first solenoid valve 155 and the second solenoid valve 157a are closed to keep the sampling tube 156 in a closed state, thereby effectively preventing water sample contamination. In this application, a pressure sensor 141 is also set up to work in conjunction with a second PLC controller. The fluctuation of the pressure sensor 141 detects the value changes to determine whether the lowering of the winding device 120 has reached a specific detection depth, thereby realizing wireless linkage between the surface winding device 120 and the underwater sampling device 150.

[0019] In some embodiments, the winding device 120 includes a reel 121 rotatably mounted above the sampling well 112 via a support frame. A helical rope 130 is wound around the reel 121. One end of the reel 121 is coaxially connected to a driven sprocket 122. A rotary motor 123 is mounted on one side of the reel 121. The output end of the rotary motor 123 is connected to a driving sprocket 124. The driving sprocket 124 and the driven sprocket 122 are connected by a chain link 125. This application embodiment provides a specific configuration of the winding device 120. During operation, after the rotary motor 123 rotates forward, it further drives the reel 121 to rotate via the driving gear, driven gear, and chain link 125, thereby lowering the helical rope 130. The rotary motor 123 can be connected to a first PLC controller. Therefore, by controlling the number of rotations of the rotary motor 123 via the first PLC controller, the number of rotations of the reel 121 can be controlled, further controlling the lowering depth of the diving cage 140. Once sampling at all depths is complete, the winding device 120 can be reversed to lift the diving cage 140 via the hinge rope 130.

[0020] In some embodiments, a filter screen 158 is connected to the inlet 157 of the sampling tube 156. In this embodiment, the filter screen 158 is provided to prevent mud, sand, and aquatic plants from entering the sampling tube 156 and causing blockage.

[0021] In some embodiments, a door 142 is provided on one side of the diving cage 140, and a locking mechanism 143 is provided at the door 142. In this embodiment, by providing the door 142, it is convenient to open the door 142 and remove the sampling device 150.

[0022] In some embodiments, the bottom plate of the diving cage 140 is a stainless steel plate, and a slide rail 144 is provided on the top of the stainless steel plate. A groove 152a corresponding to the slide rail 144 is provided on the bottom plate of the sealed box 152, and the sealed box 152 is slidably connected to the slide rail 144 via the groove 152a. The groove 152a and the slide rail 144 are fixed by screws. In this embodiment, after the sampling vessel 110 reaches the shore, the bolts can be removed, and the sealed box 152 can be slid out of the slide rail 144 to complete the overall disassembly of the sampling device 150.

[0023] In some embodiments, a plurality of counterweights 159 are detachably provided on the bottom plate of the diving cage 140. In this embodiment, the counterweights 159 are used to enhance the stability of the diving cage 140 during descent.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although the foregoing embodiments have provided a detailed description of this application, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sampling device for water quality testing, characterized in that, The system includes a sampling vessel, which has an upward protrusion in the middle to form a boss. A sampling well is vertically opened at the boss and extends to the bottom of the sampling vessel. A winding device is installed above the sampling well. A first PLC controller is electrically connected to the winding device. The winding device is connected to a diving cage via a hinged rope. A sampling device is installed inside the diving cage. A pressure sensor is fixed at the diving cage. The sampling device includes a submersible pump and a sealed box. The inlet of the submersible pump is connected to multiple negative pressure pipes via a multi-port connector. The end of the negative pressure pipe is connected to a sampling tube via a first solenoid valve. An inlet is provided at the end of the sampling tube away from the first solenoid valve. A second solenoid valve is provided at the inlet. A battery and a second PLC controller are provided inside the sealed box. The battery is electrically connected to the submersible pump, and the second PLC controller is electrically connected to multiple first solenoid valves, multiple second solenoid valves, and the pressure sensor.

2. The sampling device for water quality testing according to claim 1, characterized in that, The winding device includes a reel rotatably mounted above the sampling well via a support frame. The hinged rope is wound around the reel. One end of the reel is coaxially connected to a driven sprocket. A rotating motor is mounted on one side of the reel. The output end of the rotating motor is connected to a driving sprocket. The driving sprocket and the driven sprocket are connected by a chain link drive.

3. The sampling device for water quality testing according to claim 1, characterized in that, A filter screen is connected to the water inlet of the sampling tube.

4. The sampling device for water quality testing according to claim 1, characterized in that, The diving cage has a door on one side, and a locking mechanism is provided at the door.

5. The sampling device for water quality testing according to claim 4, characterized in that, The bottom plate of the diving cage is made of stainless steel plate, and a slide rail is provided on the top of the stainless steel plate. The bottom plate of the sealing box is provided with a slide groove corresponding to the slide rail, and the sealing box is slidably connected to the slide rail through the slide groove. The slide groove and the slide rail are fixed by screws.

6. The sampling device for water quality testing according to claim 5, characterized in that, The bottom plate of the diving cage is detachably equipped with multiple counterweights.

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