Automatic positioning depth sampler for water body detection

Abstract

The invention discloses an automatic positioning depth sampler for water body detection, and relates to the field of water samplers. The automatic positioning depth sampler for water body detection comprises a box-type sampling station and a sampling unit, the sampling unit comprises a vacuum pump and a turnover tank, the top end of the turnover tank is connected with a long pipe, and the other end of the long pipe is connected with a sampling positioner; the sampling positioner comprises a balance weight part and a retractable air bag, an ultrasonic distance sensor is mounted at the bottom end of the balance weight part, a sampling pipe is arranged in the balance weight part, and the tail end of the long pipe is connected with the retractable air bag and the sampling pipe by mounting a four-way electromagnetic valve. According to the automatic positioning depth sampler for water body detection, when the long pipe is connected with the retractable air bag, the vacuum pump sucks air or exhausts air, so that the buoyancy of the sampling positioner is changed, depth positioning is realized, when the long pipe is connected with the sampling pipe, a water sample is sucked into the turnover tank, and after sampling is completed, automatic positioning to a target water layer for sampling is realized; the use is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of water samplers, in particular to an automatic positioning depth sampler for water body detection. Background Art

[0002] When conducting water testing, a sampler is usually inserted into the water to obtain water samples, which are then analyzed to detect target components in the water and determine the source of pollution. In this process, the sampler is indispensable.

[0003] There are many types of samplers on the market, which can be roughly divided into two categories. One is a pump sampler, which samples by inserting a long tube into the water and sucking water with a water pump. The other is a sampler connected to a sampling container with a long rope, which is placed in the water and the sample is directly obtained through the sampling container. In actual application, when it is necessary to obtain samples at the target depth, the length of the long tube or rope inserted into the water is usually controlled to ensure that the long tube or rope is vertically downward. However, in many waters, the depth of the water body gradually increases from the shore to the middle. Therefore, it is usually impossible to obtain samples at the target depth on the shore. At this time, either the hull is moved to the deep water for sampling, or a long pole or floating part is used to throw the sampler outward for suspended detection, which is very troublesome. For this reason, an automatic positioning depth sampler for water body detection is provided to solve the above problem. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an automatic positioning depth sampler for water body detection, which solves the problem that in many water bodies the depth of the water body gradually increases from the shore to the middle, so samples of the target depth cannot usually be obtained on the shore. In this case, either the hull is moved to a deep position in the water to take samples, or a long pole or floating member is used to throw the sampler outward for suspended detection, both of which are very troublesome.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automatic positioning depth sampler for water body detection, comprising: Box sampling station; A sampling unit, the sampling unit comprising a vacuum pump and a turnover tank fixedly installed inside the box-type sampling station, the top end of the turnover tank is connected to a long tube, and the other end of the long tube is connected to a sampling locator; The sampling positioner comprises a counterweight and a collapsible airbag arranged on the top of the counterweight, and an ultrasonic distance sensor is installed at the bottom of the counterweight, a sampling tube is arranged inside the counterweight, and the end of the long tube is connected to the collapsible airbag and the sampling tube by installing a four-way solenoid valve; When the long tube is connected to the shrinkable airbag through the four-way solenoid valve, the vacuum pump inflates and deflates the shrinkable airbag to adjust the buoyancy and change the depth position; When the long tube is connected to the sampling tube through the four-way electromagnetic valve, the vacuum pump draws air to draw the water sample into the turnover tank to realize sampling.

[0006] Preferably, the box-type sampling station includes a box body and a box cover installed on the top of the box body, a control host and a battery are installed inside one end of the box body, and a sample storage bottle is provided at the other end of the box body. The battery supplies power to the control host, vacuum pump, four-way solenoid valve and ultrasonic distance sensor.

[0007] Preferably, a positioning frame is fixedly provided inside the box, the sample storage bottle is movably inserted in the positioning frame, the battery and the vacuum pump are arranged side by side, and a flip protective cover is provided on the top of both, and a vent facing the vacuum pump is opened on the flip protective cover.

[0008] Preferably, a storage groove is provided on the top of the box cover, and a towing rod is rotatably provided inside the storage groove.

[0009] Preferably, a protective cover shell is provided on the outer surface of the retractable airbag, and the protective cover shell is slidably arranged on the top outer surface of the counterweight and is fixedly connected to the protective cover shell. An isolation tube is provided through the interior of the retractable airbag, one end of the isolation tube is sealed and connected to the long tube, and the other end of the isolation tube is connected to the input end of the four-way solenoid valve.

[0010] Preferably, a plurality of grille grooves are provided on the outer surface of the protective cover shell, a positioning block is fixedly welded to the inner bottom of the protective cover shell, a sliding groove is provided on the outer wall of the counterweight, a sliding rail is fixedly arranged in the sliding groove, and the positioning block is slidably connected to the outer surface of the sliding rail.

[0011] Preferably, the four-way solenoid valve is fixedly installed inside the counterweight, an air duct is installed at the bottom of the shrinkable airbag, the air duct and the sampling tube are respectively connected to two output ends of the four-way solenoid valve, and the other output end of the four-way solenoid valve is sealed.

[0012] Preferably, a plurality of liquid flow channels distributed in a circular array are arranged inside the bottom end of the counterweight, a connector is installed between the top of the plurality of liquid flow channels and the sampling tube, and an annular filter is arranged at the bottom of the plurality of liquid flow channels.

[0013] Preferably, the turnover tank includes a sealed tank body and a conical drainage piece arranged at the bottom of the sealed tank body, a ventilation pipe is installed between the top of the sealed tank body and the vacuum pump, the end of the long tube is installed at the top of the sealed tank body, and a wire is arranged in the inner wall of the long tube, and the control host is connected to the four-way solenoid valve and the ultrasonic distance sensor through the wire.

[0014] Preferably, a drain pipe is installed at the bottom end of the conical drain piece, a control valve is installed on the outer surface of the drain pipe, a connecting plug is installed at the other end of the drain pipe, the connecting plug is adapted to the top of the sample storage bottle, a pressure relief hole is opened at the top of the sample storage bottle, and a bottle cap is threadedly connected to the outside of the top of the sample storage bottle.

[0015] The present invention discloses an automatic positioning depth sampler for water body detection, which has the following beneficial effects: 1. The automatic positioning depth sampler for water body detection changes the air pressure environment inside the turnover tank through a vacuum pump, and at the same time allows the long tube to be selected and connected to the shrinkage air bag or the sampling tube through a four-way solenoid valve. When the long tube is connected to the shrinkage air bag, the vacuum pump inhales or exhausts air, thereby changing the buoyancy of the sampling locator, achieving buoyancy and gravity balance after the sampling locator is raised and lowered, achieving target depth hovering, and achieving the purpose of water layer positioning. When the long tube is connected to the sampling tube, the vacuum pump inhales air, so that negative pressure is formed inside the turnover tank, and the water sample is sucked into the turnover tank. After sampling is completed, the vacuum pump exhausts air to remove the residual water sample in the sampling tube, thereby achieving automatic positioning to the target water layer for sampling, which is easy to use.

[0016] 2. The automatic positioning depth sampler for water body detection is configured by setting a conical drainage piece at the bottom of the turnover tank. The conical drainage piece is connected to a plug through a drainage pipe. A control valve is installed on the drainage pipe. After completing the water sampling into the turnover tank, the vacuum pump is started to inject air into the turnover tank. At this time, the water sample inside the turnover tank enters the sample storage bottle under the action of air pressure and gravity, and the sample storage bottle is exhausted through the pressure relief hole, thereby realizing sample collection and storage.

[0017] 3. The automatic positioning depth sampler for water body detection is designed with a turnover tank and a long tube, so that the vacuum pump can achieve depth adjustment and sample acquisition by changing the air pressure state inside the turnover tank. At the same time, a wire is set in the inner wall of the long tube, so that the long tube can be used for water, electricity and gas. When designing the material of the long tube, the overall density is designed to be close to the density of the water body, so as to reduce the influence of the mass traction of the long tube on the suspension stability of the sampling locator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the internal structure of the box-type sampling station of the present invention; Figure 2 This is a schematic diagram of the outer surface structure of the box-type sampling station of the present invention; Figure 3 It is a schematic diagram of the internal structure of the box body of the present invention; Figure 4 This is a schematic diagram of the outer surface structure of the sampling positioner of the present invention; Figure 5 An exploded view of the outer surface structure of the sampling locator of the present invention; Figure 6 This is a cross-sectional view of the internal structure of the counterweight of the present invention; Figure 7 This is a cross-sectional view of the internal structure of the turnover tank of the present invention; Figure 8 It is a schematic diagram of the structure of the connecting plug and the sample storage bottle of the present invention.

[0020] In the figure: 1. Box-type sampling station; 11. Box body; 12. Box cover; 13. Storage slot; 14. Drag rod; 15. Positioning rack; 16. Sample storage bottle; 162. Pressure relief hole; 163. Bottle cover; 17. Control host; 18. Battery; 19. Flip protection cover; 110. Vent; 111. Wire; 2. Sampling unit; 21. Vacuum pump; 22. Turnover tank; 221. Sealed tank body; 222. Conical drainage piece; 223. Ventilation pipe; 224. Drain pipe; 225 , control valve; 226, connecting plug; 23, long tube; 24, sampling positioner; 241, counterweight; 242, protective cover shell; 2422, grille slot; 2423, positioning block; 243, retractable air bag; 244, isolation tube; 245, four-way solenoid valve; 246, air guide tube; 247, sampling tube; 248, connector; 249, liquid flow channel; 2410, annular filter; 2411, ultrasonic distance sensor; 2412, slide groove; 2413, slide rail. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The embodiment of the present application provides an automatically positioned depth sampler for water body detection, which solves the problem that in many water bodies, the depth of the water body gradually increases from the shore to the middle. Therefore, it is usually impossible to obtain samples of the target depth on the shore. At this time, either the hull is moved to a deep position in the water area for sampling, or a long pole or floating device is used to throw the sampler outward for suspended detection, which is a very troublesome problem.

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] The embodiment of the invention discloses an automatic positioning depth sampler for water body detection.

[0025] According to the attached Figure 1-8 As shown, it includes a box-type sampling station 1 and a sampling unit 2. The sampling unit 2 includes a vacuum pump 21 and a turnover tank 22 fixedly installed inside the box-type sampling station 1. The top end of the turnover tank 22 is connected to a long tube 23, and the other end of the long tube 23 is connected to a sampling positioner 24. The sampling positioner 24 includes a counterweight 241 and a collapsible airbag 243 disposed on the top of the counterweight 241, and an ultrasonic distance sensor 2411 is installed at the bottom of the counterweight 241. A sampling tube 247 is arranged inside the counterweight 241. The end of the long tube 23 is connected to the collapsible airbag 243 and the sampling tube 247 by installing a four-way solenoid valve 245. When the long tube 23 is connected to the shrinkable airbag 243 through the four-way solenoid valve 245, the vacuum pump 21 inflates and deflates the shrinkable airbag 243 to adjust the buoyancy and change the depth position. In this process, the long tube 23 is connected to the shrinkable airbag 243 by starting the four-way solenoid valve 245, and the vacuum pump 21 draws air to shrink the shrinkable airbag 243. At this time, the amount of air inside the entire sampling locator 24 decreases and begins to sink. During the sinking process, the ultrasonic distance sensor 2411 continuously detects the depth. When the target depth is reached, the vacuum pump 21 starts to inflate, causing the shrinkable airbag 243 to expand, and finally the buoyancy and gravity of the entire sampling locator 24 reach a balance point. At this time, the sampling locator 24 is suspended in the target water layer to achieve target depth positioning.

[0026] When the long tube 23 is connected to the sampling tube 247 through the four-way solenoid valve 245, the vacuum pump 21 draws air to draw the water sample into the turnover tank 22 to achieve sampling. During this process, the four-way solenoid valve 245 is started to connect the long tube 23 with the sampling tube 247. At this time, the vacuum pump 21 draws air, so that negative pressure begins to form inside the turnover tank 22. At this time, the control valve 225 needs to be kept closed to allow the water to pass through the liquid flow channel 249 and enter the sampling tube 247 upward, and then enter the turnover tank 22 through the long tube 23 and be stored at the bottom of the turnover tank 22.

[0027] The box-type sampling station 1 includes a box body 11 and a box cover 12 installed on the top of the box body 11. A control host 17 and a battery 18 are installed inside one end of the box body 11, and a sample storage bottle 16 is arranged at the other end of the box body 11. The battery 18 supplies power to the control host 17, the vacuum pump 21, the four-way solenoid valve 245 and the ultrasonic distance sensor 2411. The control host 17 is set by a plc control machine. The ultrasonic distance sensor 2411 detects the depth of the sampling locator 24, and then the plc control machine controls the vacuum pump 21 to perform extraction and exhaust operations.

[0028] A positioning frame 15 is fixedly arranged inside the box body 11, and the sample storage bottle 16 is movably inserted in the positioning frame 15, which is convenient for carrying multiple groups of sample storage bottles 16. The battery 18 and the vacuum pump 21 are arranged side by side, and a flip protective cover 19 is arranged on the top of both. The flip protective cover 19 is provided with a vent 110 facing the vacuum pump 21, which is used for the vacuum pump 21 to draw and exhaust gas toward the outer port.

[0029] A storage slot 13 is provided on the top of the box cover 12, and a towing rod 14 is rotatably provided inside the storage slot 13, so that the device can be dragged when being carried and moved.

[0030] A protective cover shell 242 is provided on the outer surface of the retractable airbag 243, and the protective cover shell 242 is slidably set on the top outer surface of the counterweight 241 and fixedly connected to the protective cover shell 242. An isolation tube 244 is penetrated inside the retractable airbag 243, one end of the isolation tube 244 is sealed and connected to the long tube 23, and the other end of the isolation tube 244 is connected to the input end of the four-way solenoid valve 245.

[0031] The outer surface of the protective cover shell 242 is provided with a plurality of grille grooves 2422, a positioning block 2423 is fixedly welded to the inner bottom of the protective cover shell 242, a slide groove 2412 is provided on the outer wall of the counterweight 241, a slide rail 2413 is fixedly arranged in the slide groove 2412, the positioning block 2423 is slidably connected to the outer surface of the slide rail 2413, when the retractable airbag 243 is extended and retracted, the protective cover shell 242 rises and falls on the top of the counterweight 241, and at this time the positioning block 2423 slides up and down along the slide rail 2413, thereby protecting the retractable airbag 243.

[0032] The four-way solenoid valve 245 is fixedly installed inside the counterweight 241, and an air duct 246 is installed at the bottom of the retractable airbag 243. The air duct 246 and the sampling tube 247 are respectively connected to the two output ends of the four-way solenoid valve 245. The other output end of the four-way solenoid valve 245 is sealed. When the long tube 23 is connected to the sealed output end of the four-way solenoid valve 245, the entire sampling positioner 24 maintains a constant buoyancy and no water sampling is performed. At this time, the water sample in the turnover tank 22 is pressed into the sample storage bottle 16 through the vacuum pump 21.

[0033] A plurality of liquid flow channels 249 distributed in a circular array are arranged inside the bottom end of the counterweight 241, a connector 248 is installed between the top of the plurality of liquid flow channels 249 and the sampling tube 247, and an annular filter screen 2410 is arranged at the bottom of the plurality of liquid flow channels 249. The liquid flow channels 249 distributed in a circular array make the mass distribution of the entire counterweight 241 even, so that the ultrasonic distance sensor 2411 can be pointed vertically downward when in the water, ensuring the accuracy of the detection depth. At the same time, the annular filter screen 2410 can filter out large particle impurities in the water sample entering the liquid flow channel 249 to avoid clogging the liquid flow channel 249.

[0034] The turnover tank 22 includes a sealed tank body 221 and a conical drainage piece 222 arranged at the bottom of the sealed tank body 221. A ventilation pipe 223 is installed between the top of the sealed tank body 221 and the vacuum pump 21. The end of the long tube 23 is installed at the top of the sealed tank body 221, and a wire 111 is arranged in the inner wall of the long tube 23. The control host 17 is controlled and connected with the four-way solenoid valve 245 and the ultrasonic distance sensor 2411 through the wire 111. The wire 111 is passed through the inner wall of the long tube 23, so as to facilitate the power supply and signal transmission of the electronic components in the sampling locator 24 when in use.

[0035] A drain pipe 224 is installed at the bottom end of the conical drain piece 222, and a control valve 225 is installed on the outer surface of the drain pipe 224. A connecting plug 226 is installed at the other end of the drain pipe 224. The connecting plug 226 is adapted to the top of the sample storage bottle 16. A pressure relief hole 162 is provided at the top of the sample storage bottle 16. The top of the sample storage bottle 16 is threadedly connected to a bottle cap 163 on the outside of the top of the sample storage bottle 16. When the connecting plug 226 is inserted into the sample storage bottle 16 to inject water sample through the pressure relief hole 162, the air can be automatically exhausted. The conical drain piece 222 is conducive to draining the water sample in the turnover tank 22.

[0036] Working principle: When the device is in use, the box cover 12 is opened and the sampling locator 24 is thrown outward into a distant water body. At this time, the long tube 23 is connected between the sampling locator 24 and the turnover tank 22. At this time, the shrinkable airbag 243 is in a fully expanded state, so that the sampling locator 24 floats on the water surface. At the same time, under the action of the counterweight 241, the ultrasonic distance sensor 2411 of the sampling locator 24 is perpendicular to the water surface and downward, and the total depth of the water body here is measured by the ultrasonic distance sensor 2411; Then, the four-way solenoid valve 245 is started to connect the long tube 23 with the shrinkable airbag 243, and the vacuum pump 21 is used to evacuate air, causing the shrinkable airbag 243 to shrink. At this time, the air volume inside the entire sampling locator 24 is reduced, and it starts to sink. During the sinking process, the ultrasonic distance sensor 2411 continuously detects the depth. When the target depth is reached, the vacuum pump 21 is turned on to inflate, causing the shrinkable airbag 243 to expand, and finally the buoyancy and gravity of the entire sampling locator 24 reach a balance point. At this time, the sampling locator 24 is suspended in the target water layer, and the target depth positioning is achieved. Then the four-way solenoid valve 245 is started, so that the long tube 23 is connected with the sampling tube 247. At this time, the vacuum pump 21 is evacuated, so that negative pressure begins to form inside the turnover tank 22. At this time, the control valve 225 needs to be kept in a closed state, so that the water body passes through the liquid flow channel 249 upward into the sampling tube 247, and then enters the turnover tank 22 through the long tube 23 and is stored at the bottom of the turnover tank 22. When the sampling of the target water layer is completed, the four-way solenoid valve 245 is closed; At this time, take a group of sample storage bottles 16, open the bottle caps 163, insert the connecting plugs 226 into the sample storage bottles 16, then open the control valve 225, start the vacuum pump 21, and inject air into the turnover tank 22. At this time, the water sample in the turnover tank 22 enters the sample storage bottle 16 under the action of air pressure and gravity, and the sample storage bottle 16 is exhausted through the pressure relief hole 162, thereby completing the first stage of sample acquisition; Then close the control valve 225 and connect it to the sampling tube 247 through the four-way solenoid valve 245. At this time, the vacuum pump 21 continues to blow air into the turnover tank 22. At this time, under the action of positive pressure, the residual water in the long tube 23 is blown outward and discharged from the liquid flow channel 249. When the operator observes that bubbles begin to be continuously discharged from the water surface, it means that the water in the long tube 23 has been drained out. At this time, immediately start the four-way solenoid valve 245 to connect the long tube 23 with the shrinkage airbag 243. At this time, the vacuum pump 21 blows or inhales air, thereby changing the amount of air inside the shrinkage airbag 243, causing the sampling locator 24 to float or dive, thereby changing the sampling depth, and performing the next stage of sampling, and finally completing the sampling of water bodies at multiple different depths.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic positioning depth sampler for water body detection, characterized in that: include; Box sampling station (1); A sampling unit (2), the sampling unit (2) comprising a vacuum pump (21) and a turnover tank (22) fixedly installed inside the box-type sampling station (1), the top end of the turnover tank (22) being connected to a long tube (23), and the other end of the long tube (23) being connected to a sampling positioner (24); The sampling positioner (24) comprises a counterweight (241) and a collapsible airbag (243) arranged on the top of the counterweight (241), and an ultrasonic distance sensor (2411) is installed at the bottom end of the counterweight (241), a sampling tube (247) is arranged inside the counterweight (241), and the end of the long tube (23) is connected to the collapsible airbag (243) and the sampling tube (247) by installing a four-way solenoid valve (245); When the long tube (23) is connected to the collapsible airbag (243) via the four-way electromagnetic valve (245), the vacuum pump (21) inflates and deflates the collapsible airbag (243) to adjust the buoyancy and change the depth position; When the long tube (23) is connected to the sampling tube (247) via the four-way electromagnetic valve (245), the vacuum pump (21) draws air to draw the water sample into the turnover tank (22) to achieve sampling.

2. The automatic positioning depth sampler for water body detection according to claim 1, characterized in that: The box-type sampling station (1) comprises a box body (11) and a box cover (12) installed on the top of the box body (11); a control host (17) and a battery (18) are installed inside one end of the box body (11); a sample storage bottle (16) is provided at the other end of the box body (11); and the battery (18) supplies power to the control host (17), a vacuum pump (21), a four-way solenoid valve (245), and an ultrasonic distance sensor (2411).

3. The automatic positioning depth sampler for water body detection according to claim 2, characterized in that: A positioning frame (15) is fixedly arranged inside the box body (11), and the sample storage bottle (16) is movably inserted into the positioning frame (15). The battery (18) and the vacuum pump (21) are arranged side by side, and a flip protective cover (19) is arranged on the top of both. The flip protective cover (19) is provided with a vent (110) facing the vacuum pump (21).

4. The automatic positioning depth sampler for water body detection according to claim 2, characterized in that: A storage groove (13) is provided on the top of the box cover (12), and a towing rod (14) is rotatably provided inside the storage groove (13).

5. The automatic positioning depth sampler for water body detection according to claim 1, characterized in that: The outer surface of the collapsible airbag (243) is provided with a protective cover shell (242), the protective cover shell (242) is slidably arranged on the outer surface of the top end of the counterweight (241), and the long tube (23) is fixedly connected to the protective cover shell (242). An isolation tube (244) is provided inside the collapsible airbag (243), one end of the isolation tube (244) is sealedly connected to the long tube (23), and the other end of the isolation tube (244) is connected to the input end of the four-way solenoid valve (245).

6. The automatic positioning depth sampler for water body detection according to claim 5, characterized in that: The outer surface of the protective cover shell (242) is provided with a plurality of grille grooves (2422); a positioning block (2423) is fixedly welded to the inner bottom of the protective cover shell (242); a sliding groove (2412) is provided on the outer wall of the counterweight (241); a sliding rail (2413) is fixedly arranged in the sliding groove (2412); and the positioning block (2423) is slidably connected to the outer surface of the sliding rail (2413).

7. The automatic positioning depth sampler for water body detection according to claim 1, characterized in that: The four-way solenoid valve (245) is fixedly installed inside the counterweight (241); an air guide tube (246) is installed at the bottom of the collapsible airbag (243); the air guide tube (246) and the sampling tube (247) are respectively connected to two output ends of the four-way solenoid valve (245); and the other output end of the four-way solenoid valve (245) is sealed.

8. The automatic positioning depth sampler for water body detection according to claim 7, characterized in that: A plurality of liquid flow channels (249) distributed in an annular array are arranged inside the bottom end of the counterweight (241), a connector (248) is installed between the top ends of the plurality of liquid flow channels (249) and the sampling tube (247), and an annular filter screen (2410) is arranged at the bottom of the plurality of liquid flow channels (249).

9. The automatic positioning depth sampler for water body detection according to claim 2, characterized in that: The turnover tank (22) comprises a sealed tank body (221) and a conical drainage member (222) arranged at the bottom of the sealed tank body (221); a vent pipe (223) is installed between the top of the sealed tank body (221) and the vacuum pump (21); the end of the long tube (23) is installed at the top of the sealed tank body (221); a wire (111) is arranged in the inner wall of the long tube (23); and the control host (17) is connected to the four-way solenoid valve (245) and the ultrasonic distance sensor (2411) through the wire (111).

10. The automatic positioning depth sampler for water body detection according to claim 9, characterized in that: A drain pipe (224) is installed at the bottom end of the conical drain member (222), a control valve (225) is installed on the outer surface of the drain pipe (224), and a connecting plug (226) is installed at the other end of the drain pipe (224), the connecting plug (226) is adapted to the top of the sample storage bottle (16), a pressure relief hole (162) is provided at the top of the sample storage bottle (16), and a bottle cap (163) is threadedly connected to the outside of the top of the sample storage bottle (16).

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