Water pollution detection sample extraction device

Abstract

The application relates to the sampling technical field, in particular to a water pollution detection sample extraction device, which comprises a sampling main body, a fixing ring is fixedly installed at the top of the sampling main body, sampling grooves are evenly and annularly arranged at the bottom of the sampling main body, installation holes are arranged in the top inner wall of the sampling grooves, electric telescopic rods are fixedly installed in the installation holes, displacement plates are fixedly installed at the telescopic ends of the electric telescopic rods, movable plates are connected to the lower surfaces of the displacement plates through elastic components, connecting rods are fixedly installed at the bottoms of the movable plates, and sealing plates for sealing the sampling grooves are fixedly installed at the ends of the connecting rods. The water sample can be conveniently lowered through the traction rope, the displacement plates can stably move under stable pressure, automatic underwater sampling and storage are realized, different depths of water samples can be sampled at a time through multiple groups of independent sampling grooves, the efficiency is improved, underwater integrated operation can avoid water sample pollution, and the detection result is ensured to be accurate.

Description

Technical Field

[0001] This invention relates to the field of sampling technology, and in particular to a water pollution detection sample extraction device. Background Technology

[0002] In the field of water pollution control and environmental monitoring, accurate extraction of underwater water samples is a core prerequisite for subsequent testing and analysis. The representativeness, purity, and collection efficiency of the water samples directly determine the accuracy of the test results and the efficiency of the monitoring work. However, current mainstream water pollution detection sample extraction equipment has many technical shortcomings in practical applications, making it difficult to meet the sampling requirements of high precision, high efficiency, and low pollution.

[0003] Traditional water sampling equipment has significant limitations in depth sampling capabilities. Most devices employ a single sampling channel design, allowing for the collection of water samples from only a single depth in a single descent. To obtain samples from different depths, repeated descents and retrievals of the equipment are necessary, resulting in a cumbersome and time-consuming process. Furthermore, water contamination control is another major challenge. Traditional equipment separates sampling and storage operations, typically requiring underwater sampling followed by retrieval of the sampling unit to the surface and manual transfer of the sample to a dedicated storage container. During this transfer, the water sample is inevitably exposed to air, residual contaminants on the equipment surface, or the external environment, making it susceptible to oxidation and contamination. This alters the water sample composition, directly impacting the accuracy of subsequent testing results. Contamination biases are particularly pronounced for indicators susceptible to environmental influences, such as dissolved oxygen and volatile organic compounds.

[0004] Therefore, developing a water pollution detection sample extraction device that can achieve efficient multi-depth sampling, integrated underwater sampling and storage, and stable operation has become a key requirement for solving industry pain points and improving the accuracy and efficiency of water pollution detection. Summary of the Invention

[0005] The purpose of this invention is to address the deficiencies in the existing technology by proposing a water pollution detection sample extraction device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A water pollution detection sample extraction device includes a sampling body, a fixing ring fixedly installed on the top of the sampling body, and sampling slots evenly spaced in a ring at the bottom of the sampling body. An installation hole is provided on the inner wall of the top of each sampling slot, and an electric telescopic rod is fixedly installed in the installation hole. A displacement plate is fixedly installed at the telescopic end of the electric telescopic rod. A movable plate is connected to the lower surface of the displacement plate via an elastic component. A connecting rod is fixedly installed at the bottom of the movable plate, and a sealing plate for sealing the sampling slots is fixedly installed at the end of the connecting rod. A stop block located above the sealing plate is also fixedly installed on the inner wall of the sampling slots. The device further includes:

[0008] A sampling component, which is disposed above the sealing plate, is used to perform water sampling and sealing operations underwater;

[0009] A pressure stabilizing component is disposed in the sampling body and is used to balance the air pressure in the sampling tank.

[0010] As a further embodiment of the present invention: the elastic component includes a fixed rod fixedly installed on the lower surface of the displacement plate, the fixed rod vertically penetrating the movable plate, and a baffle plate fixedly installed at the bottom end of the fixed rod. A spring is sleeved on the outside of the fixed rod, one end of the spring is connected to the displacement plate, and the other end of the spring is connected to the movable plate.

[0011] As a further embodiment of the present invention: the sampling assembly includes a mounting base fixedly disposed on the upper surface of the sealing plate, a sampling tube placed in the mounting base, a rubber ring fixedly installed on the inner wall of the mounting base, and the rubber ring being located between the mounting base and the sampling tube; the movable plate is also provided with a sealing module, which is used to cause the sealing module to seal the sampling tube when the displacement plate approaches the movable plate.

[0012] As a further embodiment of the present invention: the sealing module includes a movable rod and a cover plate. The outer wall of the movable plate has a movable opening, and the movable rod is movably installed in the movable opening. The inner wall of the movable opening has a fixing groove, and an adsorption sheet is fixedly installed in the fixing groove. The outer wall of the movable rod has an installation groove, and a magnetic sheet is fixedly installed in the installation groove. The adsorption sheet and the magnetic sheet are attracted to each other. The upper surface of the cover plate has a threaded groove, and the bottom end of the movable rod is threaded into the threaded groove. The top end of the movable rod is fixedly installed with a stop plate. The lower surface of the cover plate is fixedly installed with a rubber stopper for sealing the sampling tube. The inner wall of the movable opening also has a limiting groove, and a limiting rod is fixedly installed on the outer wall of the movable rod, and the limiting rod passes through the limiting groove.

[0013] As a further embodiment of the present invention: sealing rings are fixedly installed on the outer sides of both the displacement plate and the sealing plate, and the sealing rings are in contact with the inner wall of the sampling groove.

[0014] As a further embodiment of the present invention: the voltage stabilizing component includes a voltage stabilizing cavity formed in the sampling body, the sampling slot and the voltage stabilizing cavity are connected by a communication port, and the communication port is located above the displacement plate. The bottom of the sampling body is provided with a plurality of voltage stabilizing channels connected to the voltage stabilizing cavity, and a piston is movably installed in the voltage stabilizing channel. An installation rod is fixedly installed on the upper surface of the piston, and a limit plate is fixedly installed at the top end of the installation rod, and the limit plate is located in the voltage stabilizing cavity.

[0015] As a further embodiment of the present invention: a waterproof cover is also sleeved on the outside of the electric telescopic rod, a groove is provided on the surface of the sampling body, and the bottom end of the waterproof cover is threadedly connected to the groove. A ring plate is also fixedly installed on the outer wall of the waterproof cover, and a washer is fixedly installed on the lower surface of the ring plate, and the washer is in contact with the upper surface of the sampling body.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention provides a water pollution detection sample extraction device. When sampling water, it is only necessary to connect and fix the traction rope to the fixing ring on the surface of the sampling body. The sampling body can then be slowly lowered into the water body to be tested by the traction rope. The operation process is simple and does not require complicated auxiliary equipment. During the lowering process, the sampling body can be accurately aligned with the area to be tested. After descending to the preset depth, the subsequent sampling operation can be started. This provides convenient and accurate initial conditions for the entire sampling process and lowers the operation threshold.

[0018] Once the sampling body reaches the preset depth, the electric telescopic rod drives the displacement plate downwards. At this time, the pressure stabilizing component simultaneously balances the air pressure in the sampling tank, effectively preventing the difference between the air pressure inside the tank and the external water pressure from hindering the movement of the displacement plate and ensuring that the displacement plate descends smoothly. The displacement plate drives the movable plate downwards through the elastic component, causing the sealing plate to move out of the sampling tank, exposing the sampling component and enabling automatic sampling. As the displacement plate continues to move downwards, the elastic component compresses to generate a reverse force, pushing the sampling component to close, achieving automatic underwater sealing. The entire single-depth sampling process requires no manual intervention, and the actions are continuous and stable, avoiding sampling failure or sample quantity deviation due to operational errors.

[0019] The sampling unit is equipped with multiple independent sampling slots. By controlling the sampling timing of different sampling slots, staff can complete the sampling operation at different preset depths during the lowering or rising of the equipment. This eliminates the need for repeated lowering and retrieval of the equipment, allowing multiple water samples at different depths to be obtained at once. This significantly reduces repetitive operations in the sampling process and shortens the overall sampling time. It is especially suitable for scenarios that require water stratification testing, greatly improving sampling efficiency.

[0020] The sampling component can complete the integrated "sampling and sealing" operation directly underwater, eliminating the intermediate step of transferring water samples from the sampling unit to the storage device. This design fundamentally avoids the water sample from being exposed to air and undergoing oxidation during the transfer process, or from being affected by residual impurities on the device surface or external environmental pollutants. It ensures that the water sample collected underwater is always in a sealed state and can be directly sent to the laboratory for testing, preserving the original components of the water sample to the greatest extent and significantly improving the accuracy of subsequent test results. Attached Figure Description

[0021] Figure 1This is a first-view structural schematic diagram of a water pollution detection sample extraction device provided in an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional structural schematic diagram of a water pollution detection sample extraction device provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the sampling tank in a water pollution detection sample extraction device provided in an embodiment of the present invention;

[0024] Figure 4 This is a half-sectional schematic diagram of the displacement plate and the movable plate in a water pollution detection sample extraction device provided in an embodiment of the present invention;

[0025] Figure 5 for Figure 4 Enlarged structural diagram at point A in the diagram;

[0026] Figure 6 This is a cross-sectional schematic diagram of the movable plate in a water pollution detection sample extraction device provided in an embodiment of the present invention;

[0027] Figure 7 This is a half-sectional structural diagram of a water pollution detection sample extraction device provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the piston structure in a water pollution detection sample extraction device provided in an embodiment of the present invention;

[0029] Figure 9 This is a second-view structural schematic diagram of a water pollution detection sample extraction device provided in an embodiment of the present invention.

[0030] In the diagram: 101-Sampling body, 102-Fixing ring, 103-Sampling groove, 104-Electric telescopic rod, 105-Displacement plate, 106-Moving plate, 107-Connecting rod, 108-Sealing plate, 109-Stop block, 201-Fixing rod, 202-Spring, 203-Baffle plate, 301-Mounting base, 302-Sampling tube, 303-Rubber ring, 401-Moving rod, 402-Cover plate, 403-Rubber plug, 404-Abutting plate, 405-Adsorption sheet, 406-Magnetic sheet, 407-Limiting rod, 501-Sealing ring, 601-Pressure stabilizing chamber, 602-Connecting port, 603-Pressure stabilizing channel, 604-Piston, 605-Mounting rod, 606-Limiting plate, 701-Waterproof cover, 702-Ring plate, 703-Washer. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figures 1-9 As shown, an embodiment of the present invention provides a water pollution detection sample extraction device, including a sampling body 101. A fixing ring 102 is fixedly installed on the top of the sampling body 101. Sampling grooves 103 are evenly spaced and distributed in a ring at the bottom of the sampling body 101. An installation hole is provided on the inner wall of the top of the sampling groove 103, and an electric telescopic rod 104 is fixedly installed in the installation hole. A displacement plate 105 is fixedly installed on the telescopic end of the electric telescopic rod 104. The lower surface of the displacement plate 105 is connected by an elastic component. The sample tank is equipped with a movable plate 106, a connecting rod 107 fixedly installed at the bottom of the movable plate 106, and a sealing plate 108 for sealing the sampling tank 103 fixedly installed at the end of the connecting rod 107. A stop block 109 located above the sealing plate 108 is also fixedly installed on the inner wall of the sampling tank 103. The sample tank also includes: a sampling component, which is located above the sealing plate 108 and is used to complete the sampling and sealing of water underwater; and a pressure stabilizing component, which is located in the sampling body 101 and is used to balance the air pressure in the sampling tank 103.

[0033] When taking water samples, the traction rope used to lower the sampling body 101 is first connected and fixed to the fixing ring 102 on the surface of the sampling body 101. The sampling body 101 is then slowly lowered into the water body to be tested using the traction rope. When the sampling body 101 descends to the preset detection depth, the electric telescopic rod 104 is activated to move the displacement plate 105 downward. During the movement, the pressure stabilizing component synchronously balances the air pressure in the sampling tank 103 to prevent the difference between the air pressure inside the tank and the external water pressure from hindering the movement of the displacement plate 105, ensuring that the displacement plate 105 descends smoothly. When the displacement plate 105 moves downward, the elastic component drives the movable plate 106 to move downward synchronously, causing the sealing plate 108 below the movable plate 106 to gradually move out of the sampling tank 103. This continues until the movable plate 106 contacts the stop block 109 and stops moving downward. At this point, the sampling component on the surface of the sealing plate 108 is fully exposed and in contact with the water body. Upon contact, the sampling operation is automatically initiated. As the displacement plate 105 continues to move downward, the elastic component between the movable plate 106 and the displacement plate 105 is compressed. The resulting reverse force pushes the sampling component to close, automatically sealing the collected water inside the sampling component, completing a single water sampling. In addition, the sampling body 101 is equipped with multiple independent sampling slots 103. By controlling the sampling timing of different sampling slots 103, water samples at different depths can be collected at once, greatly improving sampling efficiency. At the same time, the sampling component can directly complete the integrated sampling and sealing operation underwater, eliminating the step of transferring the water sample from the sampling body 101 to the storage device. This effectively avoids the water sample being exposed to air or external pollution during the transfer process, ensuring that the underwater water sample is always in a sealed state and directly sent to the laboratory for testing, significantly improving the accuracy of the test results.

[0034] As one embodiment of the present invention, please refer to Figure 3The elastic component includes a fixed rod 201 fixedly installed on the lower surface of the displacement plate 105. The fixed rod 201 extends vertically through the movable plate 106, and a baffle 203 is fixedly installed at the bottom end of the fixed rod 201. A spring 202 is sleeved on the outside of the fixed rod 201. One end of the spring 202 is connected to the displacement plate 105, and the other end of the spring 202 is connected to the movable plate 106. When the displacement plate 105 moves down, the spring 202 can drive the movable plate 106 to move down together. When the movable plate 106 contacts the baffle 109, the spring 202 on the outside of the fixed rod 201 is compressed as the displacement plate 105 continues to move down, so that the displacement plate 105 gradually approaches the movable plate 106, thereby triggering the sampling component to seal the water sample.

[0035] As one embodiment of the present invention, please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 The sampling assembly includes a mounting base 301 fixedly mounted on the upper surface of the sealing plate 108. A sampling tube 302 is placed in the mounting base 301. A rubber ring 303 is fixedly mounted on the inner wall of the mounting base 301, and the rubber ring 303 is located between the mounting base 301 and the sampling tube 302. A sealing module is also provided in the movable plate 106, which is used to cause the sealing module to seal the sampling tube 302 when the displacement plate 105 approaches the movable plate 106. When the movable plate 106 moves downward to fully contact the stop block 109, the movable plate 106 will stop moving downward. At this time, the sampling tube 302 is sealed. The sampling tube 302 mounted in the mounting 301 is completely exposed in the water. Water will automatically flow into the sampling tube 302 to complete the water sample collection. As the displacement plate 105 continues to move downward under the drive of the electric telescopic rod 104, the distance between the displacement plate 105 and the movable plate 106 gradually decreases. When the displacement plate 105 contacts and pushes the sealing module, the sealing module will precisely fit the open end of the sampling tube 302 and firmly seal the sampling tube 302, thereby completing the water sample sealing operation directly underwater and preventing the water sample from leaking or being contaminated in the subsequent process.

[0036] As one embodiment of the present invention, please refer to Figure 5 and Figure 6The sealing module includes a movable rod 401 and a cover plate 402. The outer wall of the movable plate 106 has a movable opening, and the movable rod 401 is movably installed in the movable opening. The inner wall of the movable opening has a fixing groove, and an adsorption piece 405 is fixedly installed in the fixing groove. The adsorption piece 405 is made of ferrous material that can be attracted by a magnetic piece 406. The outer wall of the movable rod 401 has an installation groove, and a magnetic piece 406 is fixedly installed in the installation groove. The adsorption piece 405 and the magnetic piece 406 are attracted to each other. The upper surface of the cover plate 402 has a threaded groove, and the bottom end of the movable rod 401 is threaded into the threaded groove. A stop plate 404 is fixedly installed at the top end of the movable rod 401. The cover plate 402... A rubber plug 403 is fixedly installed on the lower surface of the 2 to seal the sampling tube 302. A limiting groove is also opened on the inner wall of the movable port. A limiting rod 407 is fixedly installed on the outer wall of the movable rod 401, and the limiting rod 407 passes through the limiting groove. When the water fills the sampling tube 302, the displacement plate 105 continues to move downward under the drive of the electric telescopic rod 104, which will squeeze the spring 202 on the outside of the fixed rod 201, causing the spring 202 to gradually compress. As the deformation of the spring 202 intensifies, the displacement plate 105 gradually moves closer to the movable plate 106 until the displacement plate 105 is in complete contact with the abutment plate 404. At this time, the continuous downward pressure of the displacement plate 105 will drive the movable rod 407 at the bottom of the abutment plate 404. 1. The synchronous downward movement causes the magnetic plate 406 on the outside of the movable rod 401 to misalign with the adsorption plate 405 inside the movable plate 106. The adsorption effect of the magnetic plate 406 on the adsorption plate 405 is thus released, allowing the movable rod 401 to move freely up and down within the reserved channel of the movable plate 106. As the displacement plate 105 continues to move downward, it drives the cover plate 402, which is threadedly connected to the bottom of the movable rod 401, to move downward together until the rubber plug 403 below the cover plate 402 is precisely inserted into the opening of the sampling tube 302. With the sealing effect of the rubber plug 403, the underwater sealing operation of the water sample is completed. After sampling is completed, the electric telescopic rod 104 drives the displacement plate 105 to return upward. Because the adsorption plate 405 and the magnetic plate 406 are misaligned, the adsorption force disappears, and the movable rod 401 will not move upward synchronously with the movable plate 106, thus maintaining a sealed state on the sampling tube 302. After the sampling body 101 is lifted out of the water by the traction rope, the movable rod 401 cannot rotate under the constraint of the limiting rod 407. The staff can directly rotate the cover plate 402 at the end of the movable rod 401 to remove it from the movable rod 401, and then take the sampling tube 302 out of the mounting base 301. Throughout the process, the water sample is always in a sealed state and is directly sent to the laboratory for testing, effectively avoiding water sample exposure or contamination and greatly improving the accuracy of water body test results.

[0037] As one embodiment of the present invention, please refer to Figure 3A sealing ring 501 is fixedly installed on the outer side of both the displacement plate 105 and the sealing plate 108, and the sealing ring 501 fits against the inner wall of the sampling groove 103, which can effectively improve the sealing effect of the displacement plate 105 and the sealing plate 108.

[0038] As one embodiment of the present invention, please refer to Figure 2 , Figure 7 , Figure 8 and Figure 9 The pressure stabilizing component includes a pressure stabilizing cavity 601 opened in the sampling body 101. The sampling groove 103 and the pressure stabilizing cavity 601 are connected by a communication port 602, and the communication port 602 is located above the displacement plate 105. The bottom of the sampling body 101 is provided with multiple pressure stabilizing channels 603 connected to the pressure stabilizing cavity 601. A piston 604 is movably installed in the pressure stabilizing channel 603. An installation rod 605 is fixedly installed on the upper surface of the piston 604. A limit plate 606 is fixedly installed at the top of the installation rod 605, and the limit plate 606 is located in the pressure stabilizing cavity 601. When the displacement plate 105 moves downward in the sampling groove 103, the spatial volume in the sampling groove 103 gradually increases, and the internal air pressure decreases accordingly. At this time, the air stored in the pressure stabilizing chamber 601 will be automatically replenished into the sampling slot 103 through the connecting port 602. Simultaneously, the piston 604 in the pressure stabilizing channel 603 moves upward synchronously under the action of the air pressure difference. This process can balance the air pressure in the sampling slot 103 in real time, avoiding negative pressure caused by excessively low air pressure in the slot, thus preventing the displacement plate 105 from moving and ensuring that the displacement plate 105 always moves smoothly down the sampling slot 103. During the movement of the piston 604, the limiting plate 606 and the mounting rod 605 will synchronously constrain the movement trajectory of all pistons 604, ensuring the smooth movement of multiple pressure stabilizing channels. The piston 604 inside 603 maintains a consistent movement rhythm, further enhancing the stability of air pressure balance. In addition, the design of the limiting plate 606 can limit the movement range of the piston 604. When the limiting plate 606 contacts the bottom or top of the pressure stabilizing chamber 601, the piston 604 remains inside the pressure stabilizing channel 603 and will not exceed the channel range. This structure can effectively prevent water from flowing back into the pressure stabilizing chamber 601 through the pressure stabilizing channel 603, ensuring that the pressure stabilizing chamber 601 is always in a dry air storage state, ensuring stable and reliable air pressure regulation function, and better performance.

[0039] As one embodiment of the present invention, please refer to Figure 1 and Figure 2A waterproof cover 701 is fitted onto the outer side of the electric telescopic rod 104. A groove is formed on the surface of the sampling body 101, and the bottom end of the waterproof cover 701 is threadedly connected to the groove. A ring plate 702 is fixedly installed on the outer wall of the waterproof cover 701, and a washer 703 is fixedly installed on the lower surface of the ring plate 702. The washer 703 fits snugly against the upper surface of the sampling body 101. The washer 703 enhances the waterproofing effect. The waterproof cover 701 on the sampling body 101 can tightly cover the outer side of the electric telescopic rod 104, forming an effective waterproof effect. The water barrier directly prevents water from contacting the electric telescopic pole 104, avoiding water erosion that could cause rust, short circuits, or other malfunctions, thus ensuring its operational stability and service life. Furthermore, the waterproof cover 701 features a detachable rotating design. When inspection or maintenance of the electric telescopic pole 104 is required, simply remove the waterproof cover 701 along the rotation direction to quickly expose the overall structure of the electric telescopic pole 104, without disassembling other complex components. This significantly reduces the difficulty of inspection and maintenance operations and improves maintenance efficiency.

[0040] It should be noted that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A water pollution detection sample extraction device comprising a sampling body, characterized in that, The top of the sampling body is fixedly provided with a fixed ring, and the bottom of the sampling body is provided with sampling grooves which are distributed in a ring shape at equal distances, the top inner wall of the sampling groove is provided with a mounting hole, and an electric telescopic rod is fixedly installed in the mounting hole, the telescopic end of the electric telescopic rod is fixedly provided with a displacement plate, the lower surface of the displacement plate is connected with a movable plate through an elastic component, the bottom of the movable plate is fixedly provided with a connecting rod, and the end of the connecting rod is fixedly provided with a sealing plate for sealing the sampling groove, the inner wall of the sampling groove is further fixedly provided with a stopper above the sealing plate, and further comprises: a sampling assembly, which is arranged above the sealing plate and is used for sampling and storing the water body underwater; and a pressure stabilizing assembly, which is arranged in the sampling body and is used for balancing the air pressure in the sampling groove. The elastic component comprises a fixed rod which is fixedly installed on the lower surface of the displacement plate, the fixed rod vertically penetrates the movable plate, and the bottom end of the fixed rod is fixedly provided with a baffle, a spring is sleeved on the outer side of the fixed rod, one end of the spring is connected with the displacement plate, and the other end of the spring is connected with the movable plate. The sampling assembly comprises a mounting seat which is fixedly arranged on the upper surface of the sealing plate, the sampling pipe is placed in the mounting seat, the inner wall of the mounting seat is fixedly provided with a rubber ring, and the rubber ring is located between the mounting seat and the sampling pipe, and the movable plate is further provided with a sealing module which is used for sealing the sampling pipe when the displacement plate approaches the movable plate. The sealing module comprises a movable rod and a cover plate, the outer wall of the movable plate is provided with a movable port, the movable rod is movably installed in the movable port, the inner wall of the movable port is provided with a fixed groove, and an adsorption piece is fixedly installed in the fixed groove, the outer wall of the movable rod is provided with a mounting groove, and a magnetic piece is fixedly installed in the mounting groove, the adsorption piece and the magnetic piece are adsorbed, the upper surface of the cover plate is provided with a threaded groove, and the bottom end of the movable rod is threadedly connected in the threaded groove, the top end of the movable rod is fixedly provided with a resisting plate, the lower surface of the cover plate is fixedly provided with a rubber plug which is used for sealing the sampling pipe, and the inner wall of the movable port is further provided with a limiting groove, the outer wall of the movable rod is fixedly provided with a limiting rod which penetrates the limiting groove.

2. The water pollution detection sample extraction device according to claim 1, wherein, The outer sides of the displacement plate and the sealing plate are both fixedly provided with sealing rings which are attached to the inner wall of the sampling groove.

3. The water pollution detection sample extraction device according to claim 1, wherein, The pressure stabilizing assembly comprises a pressure stabilizing cavity which is arranged in the sampling body, the sampling groove and the pressure stabilizing cavity are communicated through a communication port, the communication port is located above the displacement plate, the bottom of the sampling body is provided with a plurality of pressure stabilizing channels which are communicated with the pressure stabilizing cavity, and a piston is movably installed in the pressure stabilizing channel, the upper surface of the piston is fixedly provided with a mounting rod, the top end of the mounting rod is fixedly provided with a limiting plate which is located in the pressure stabilizing cavity.

4. The water pollution detection sample extraction device according to claim 1, wherein, The outer side of the electric telescopic rod is further sleeved with a waterproof cover, the surface of the sampling body is provided with a groove, and the bottom end of the waterproof cover is threadedly connected with the groove, the outer wall of the waterproof cover is further fixedly provided with a ring plate, the lower surface of the ring plate is fixedly provided with a gasket which is attached to the upper surface of the sampling body. The outer side of the electric telescopic rod is further sleeved with a waterproof cover, the surface of the sampling body is provided with a groove, and the bottom end of the waterproof cover is threadedly connected with the groove, the outer wall of the waterproof cover is further fixedly provided with a ring plate, the lower surface of the ring plate is fixedly provided with a gasket which is attached to the upper surface of the sampling body.

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