A sampling device for water pollution detection

Abstract

This invention provides a sampling device for water pollution detection, belonging to the technical field of detection equipment. It includes a submerged cylinder, an installation cylinder, a suction pipe, and a driving assembly. A movable tube is rotatably mounted at one end of the suction pipe, and the movable tube is connected to the suction pipe. A sampling tube is installed at one end of the movable tube. The driving assembly is connected to the movable tube. A sampling tube is detachably mounted on the installation cylinder. The sampling tube contains several sampling chambers and a transfer chamber. The sampling chambers and transfer chambers are adjacent. A through groove is formed in the transfer chamber, and the transfer chamber is connected to a liquid collection chamber through the through groove. A support plate is provided between the liquid collection chamber, the sampling chambers, and the transfer chamber. By providing a transfer chamber, initial water is discharged into the transfer chamber, making the sampling depth data more accurate. By setting the outer side of the support plate to tilt towards the submerged cylinder, it is possible to prevent the sampled water from concentrating on the inner side and overflowing through the inlet corresponding to the sealing plate.

Description

Technical Field

[0001] This invention belongs to the field of detection equipment technology, specifically a sampling device for water pollution detection. Background Technology

[0002] Water quality monitoring is the process of monitoring and measuring the types of pollutants in water bodies, the concentrations of various pollutants, and their changing trends to evaluate the water quality status. The monitoring scope is very broad, including unpolluted and polluted natural water (rivers, lakes, seas, and groundwater) as well as various industrial wastewater. The main monitoring items can be divided into two categories: one is comprehensive indicators reflecting the water quality status, such as temperature, color, turbidity, pH value, conductivity, suspended solids, dissolved oxygen, chemical oxygen demand, and biochemical oxygen demand; the other is some toxic substances, such as phenols, cyanides, arsenic, lead, chromium, cadmium, mercury, and organic pesticides, to objectively evaluate the water quality status of rivers and oceans.

[0003] When sampling contaminated water sources, a sampler is required. Since there are slight differences in the types and concentrations of pollutants at different depths in the water source, samples are usually taken from different depths to ensure accuracy. Current technology often involves completely submerging the sampler in the water and then using suction devices at different depths to achieve sampling at different depths. However, in practice, the water at different depths is easily mixed during the insertion of the sampling device, resulting in inaccurate sampling depth. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a sampling device for water pollution detection.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a sampling device for water pollution detection, comprising a sinking cylinder and an installation cylinder, wherein a suction pipe is installed inside the sinking cylinder, an installation cylinder is installed at one end of the sinking cylinder, and a plurality of water leakage holes are formed on the surface of the sinking cylinder; and a driving component is also included, wherein a movable tube is rotatably installed at one end of the suction pipe, a water pump is installed on the movable tube, the movable tube is connected to the suction pipe, a sampling tube is installed at one end of the movable tube, and the driving component is connected to the movable tube, the driving component being used to drive the movable tube to rotate.

[0006] A sampling cylinder is detachably mounted on the mounting cylinder. The sampling cylinder is generally annular, and its outer wall is in contact with the water outlet end of the sampling tube. The sampling cylinder is provided with several sampling chambers and a transfer chamber. The sampling chambers and the transfer chamber are adjacent to each other. A through groove is provided in the transfer chamber. A liquid collection chamber is provided below the sampling chambers and the transfer chamber. The transfer chamber and the liquid collection chamber are connected through the through groove. A load-bearing plate is provided between the liquid collection chamber and the sampling chamber and the transfer chamber. The load-bearing plate separates the liquid collection chamber from the sampling chamber and the liquid collection chamber from the transfer chamber. The outer side of the load-bearing plate is inclined towards the sinking cylinder.

[0007] Sealing plates are slidably installed on the inner walls of the sampling chamber and the transfer chamber.

[0008] As a further improvement: a third spring is installed between the sampling cylinder and the mounting cylinder, and a mounting cover is detachably installed on the mounting cylinder.

[0009] As a further improvement: a first drain pipe is provided on the outer wall of the sampling chamber, and a second drain pipe is provided on the outer wall of the liquid collection chamber. Both the first drain pipe and the second drain pipe are equipped with valves.

[0010] As a further improvement: a sliding groove is provided on the inner wall of the sampling tube, a sealing plate is slidably installed in the sliding groove, a fourth spring is installed between the sealing plate and the sliding groove, a trapezoidal block is fixedly installed on the sealing plate, and the sampling tube contacts the trapezoidal block during rotation.

[0011] As a further improvement: a support frame is fixedly installed on the sampling tube, a power box is fixedly installed on the mounting cylinder, the power box is rotatably connected to the movable tube, the support frame is slidably installed on the power box, and a telescopic tube is fixedly installed between the sampling tube and the movable tube.

[0012] As a further improvement: the power box is provided with a rotating groove and a retraction groove. When sampling is performed, one end of the support frame is located in the rotating groove, and the retraction groove is L-shaped. When the sampling cylinder is installed or removed, one end of the support frame is located in the retraction groove. An arc-shaped plate is elastically installed on the power box, and the arc-shaped plate fits against the support frame under relaxed conditions.

[0013] As a further improvement, a conical cover is provided at one end of the sinking cylinder, and several water leakage holes are also provided on the conical cover.

[0014] As a further improvement: several segmented plates are fixedly installed on the sinking cylinder, and floating plates are movably installed on both sides of each segmented plate. When the segmented plate is in contact with the floating plates on both sides, the water pump is started.

[0015] As a further improvement: a wedge-shaped column is movably installed on the drainage hole between the adjacent float plate and the segment plate of the sinking cylinder, and an mounting base is fixedly installed on the sinking cylinder, with a first spring installed between the mounting base and the wedge-shaped column.

[0016] Compared with the prior art, the beneficial effects of the present invention are: by setting up a transfer chamber, the initial water can be discharged into the transfer chamber, avoiding the impact of dirt or residual water in the suction tube on the authenticity of the sampling data. The initial water can be flushed through the inlet pipe before sampling begins. When the next depth is reached, the water remaining in the suction tube is actually the water sample from the previous depth. Therefore, by discharging the initial water into the transfer chamber, the sampling depth data can be made more accurate.

[0017] By setting the outer side of the load-bearing plate to be inclined toward the sinking cylinder, the sampling water can first flow toward the outer side of the sampling cylinder, thereby avoiding the sampling water from concentrating on the inner side and overflowing through the water inlet corresponding to the sealing plate.

[0018] By setting up a collection chamber, the sampled water can be completely separated from the initial water in the early stage, avoiding the mixing of water in the transfer chamber and the sampling chamber due to external forces. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a sampling device for water pollution detection;

[0020] Figure 2 A schematic diagram of the mounting cover and mounting cylinder structure of a sampling device for water pollution detection;

[0021] Figure 3 A schematic diagram of the mounting cover structure for a sampling device used in water pollution detection;

[0022] Figure 4 A schematic diagram of the mounting cylinder structure of a sampling device for water pollution detection;

[0023] Figure 5 A schematic cross-sectional view of the mounting cylinder of a sampling device for water pollution detection. Figure 1 ;

[0024] Figure 6 A schematic cross-sectional view of the mounting cylinder of a sampling device for water pollution detection. Figure 2 ;

[0025] Figure 7 A schematic diagram of the sampling cylinder structure of a sampling device for water pollution detection;

[0026] Figure 8 A schematic diagram of the cross-sectional structure of the sampling cylinder of a sampling device for water pollution detection;

[0027] Figure 9 A schematic diagram of the vertical cross-sectional structure of the sampling cylinder of a sampling device for water pollution detection;

[0028] Figure 10 A schematic diagram of a sliding groove structure for a water pollution detection sampling device;

[0029] Figure 11 A schematic diagram of the power box structure of a sampling device for water pollution detection;

[0030] Figure 12 A schematic diagram of the support frame structure for a sampling device used in water pollution detection;

[0031] Figure 13 A schematic diagram of an arc-shaped plate structure for a sampling device used in water pollution detection;

[0032] Figure 14 This is a schematic cross-sectional view of a sampling device for water pollution detection.

[0033] Figure 15 A schematic diagram of the upper cross-sectional structure of the submerged cylinder of a sampling device for water pollution detection;

[0034] Figure 16 A schematic diagram of the mid-section structure of the submerged cylinder of a sampling device for water pollution detection;

[0035] Figure 17 A schematic diagram of a wedge-shaped column structure for a water pollution detection sampling device;

[0036] In the diagram: 1. Mounting cylinder; 2. Sinking cylinder; 20. Segmented plate; 21. Wedge-shaped column; 22. Mounting base; 23. Telescopic rod; 24. First spring; 25. Rotating disk; 26. Knob; 3. Conical cover; 4. Sampling cylinder; 40. Sliding groove; 41. First drain pipe; 42. Second drain pipe; 43. Sampling chamber; 44. Transfer chamber; 45. First partition; 46. Second partition; 460. Notch; 47. Through groove; 48. Liquid collection chamber; 49. Support plate; 5. Power box; 51. Rotation. 52. Groove; 53. Fixed plate; 54. Recessed groove; 55. Second spring; 56. Arc plate; 67. Drive assembly; 68. Drive gear; 69. Motor; 60. Driven gear; 71. Third spring; 82. Suction tube; 93. Float plate; 10. Mounting cover; 11. Handle; 12. Internal thread; 13. Recessed groove; 14. External thread; 15. Movable tube; 16. Telescopic tube; 17. Trapezoidal block; 18. Sealing plate; 19. Fourth spring; 10. Sampling tube; 10. Support frame; 110. Roller. Detailed Implementation

[0037] The technical solution of this application will be further described in detail below with reference to specific embodiments.

[0038] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0039] Please see Figures 1 to 16 In one embodiment, a sampling device for water pollution detection includes a sinking cylinder 2 and an mounting cylinder 1. A suction pipe 8 is installed inside the sinking cylinder 2, and the mounting cylinder 1 is installed at one end of the sinking cylinder 2. A plurality of water leakage holes are opened on the surface of the sinking cylinder 2. The device also includes a driving component 6. A movable tube 13 is rotatably installed at one end of the suction pipe 8. A water pump is installed on the movable tube 13. The movable tube 13 is connected to the suction pipe 8. A sampling tube 18 is installed at one end of the movable tube 13 and is connected to the sampling tube 18. The driving component 6 is connected to the movable tube 13 and is used to drive the movable tube 13 to rotate.

[0040] A sampling cylinder 4 is detachably installed on the mounting cylinder 1. The sampling cylinder 4 is generally annular. The outer wall of the sampling cylinder 4 is in contact with the water outlet end of the sampling tube 18. The sampling cylinder 4 is provided with a plurality of sampling chambers 43 and a transfer chamber 44. The sampling chambers 43 and the transfer chambers 44 are adjacent to each other. A through groove 47 is provided in the transfer chamber 44. A liquid collection chamber 48 is provided below the sampling chambers 43 and the transfer chamber 44. The transfer chamber 44 and the liquid collection chamber 48 are connected through the through groove 47. A support plate 49 is provided between the liquid collection chamber 48 and the sampling chambers 43 and the transfer chamber 44. The support plate 49 separates the liquid collection chamber 48 from the sampling chamber 43 and the transfer chamber 44. The outer side of the support plate 49 is inclined towards the sinking cylinder 2.

[0041] A sealing plate 16 is slidably installed on the inner wall of the sampling chamber 43 and the transfer chamber 44.

[0042] In this embodiment, a first partition 45 and a second partition 46 are fixedly installed on the load-bearing plate 49. The plurality of sampling chambers 43 are separated by the first partition 45. The sampling chambers 43 and the transfer chamber 44 are separated by the second partition 46. A notch 460 is provided on the second partition 46 near the sampling tube 18.

[0043] During sampling, the sampling chambers 43 are labeled. In the initial state, the sampling tube 18 is aligned with the transfer chamber 44 and the sealing plate 16 is open. When the specified depth is reached, the water pump is started and water is pumped out. At this time, the movable tube 13 rotates synchronously. While the movable tube 13 rotates, the sampling tube 18 rotates synchronously, so that the initial water is discharged into the transfer chamber 44. This can prevent dirt or residual water in the suction tube 8 from affecting the accuracy of the sampling data. Thus, the initial water is used to flush the pipe. As the rotation continues, the later water is discharged into the sampling chamber 43. After the specified water volume is reached, the water pump is turned off. At this time, the movable tube 13 continues to rotate until it is aligned with the next transfer chamber 44. When the next depth is reached, the water remaining in the suction tube 8 is actually the water sample from the previous depth. Therefore, by discharging the initial water into the transfer chamber 44, the sampling depth data can be made more accurate.

[0044] Water in the transfer chamber 44 enters the collection chamber 48 through the through groove 47. By setting the outer side of the support plate 49 to be inclined towards the sinking cylinder 2, the sampling water can first flow towards the outer side of the sampling cylinder 4, thereby avoiding the sampling water from concentrating on the inner side and overflowing through the water inlet corresponding to the sealing plate 16.

[0045] Secondly, by setting up a liquid collection chamber 48, the sampled water can be completely separated from the initial water in the early stage, avoiding the mixing of water in the transfer chamber 44 and the sampling chamber 43 due to external force.

[0046] Please see Figures 1 to 7 In one embodiment, a third spring 7 is installed between the sampling cylinder 4 and the mounting cylinder 1, and a mounting cover 10 is detachably installed on the mounting cylinder 1.

[0047] In this embodiment, the mounting cover 10 and the mounting cylinder 1 are detachably installed by threaded installation. One end of the mounting cylinder 1 is provided with an external thread 12, and the inner wall of the mounting cover 10 is provided with an internal thread 102 that mates with the external thread 12. A handle 101 is fixedly installed on the mounting cover 10.

[0048] When installing the sampling cylinder 4, first push the sampling tube 18 to retract the telescopic tube 14 connected to the sampling tube 18, so that the roller 190 on the support frame 19 enters the relief groove 53. The actual movement trajectory is an L-shaped trajectory. During the movement, the arc plate 55 is always close to the support frame 19. At this time, the position of the support frame 19 and the sampling tube 18 can be fixed, so that the distance between the sampling tube 18 and the mounting cylinder 1 is increased, which facilitates the installation of the sampling cylinder 4. Then, align the first drain pipe 41 and the second drain pipe 42 on the sampling cylinder 4 with the relief groove 11, and slowly lower the sampling cylinder 4. When the bottom of the sampling cylinder 4 contacts the third spring 7, the top of the sampling cylinder 4 extends out of the mounting cylinder 1. Then rotate the mounting cover 10. The internal thread 102 of the mounting cover 10 and the external thread 12 of the mounting cylinder 1 cooperate to squeeze the sampling cylinder 4 down, thereby achieving the sealing of the power box 5 and the sampling cylinder 4.

[0049] When disassembling the sampling cylinder 4, open the mounting cover 10, and then the sampling cylinder 4 will spring up under the action of the third spring 7 and extend out of the mounting cylinder 1, making it easy to pick up.

[0050] Please see Figure 6 , Figure 7 In one embodiment, a first drain pipe 41 is provided on the outer wall of the sampling chamber 43, and a second drain pipe 42 is provided on the outer wall of the liquid collection chamber 48. Both the first drain pipe 41 and the second drain pipe 42 are provided with valves.

[0051] In this embodiment, the mounting cylinder 1 is provided with a clearance groove 11 corresponding to the first drain pipe 41 and the second drain pipe 42.

[0052] By providing a first drain pipe 41, a second drain pipe 42, and a clearance groove 11, the clearance groove 11 can make way for the first drain pipe 41 and the second drain pipe 42 while limiting their positions, thereby fixing the position of the sampling cylinder 4 and preventing the sampling cylinder 4 from rotating or moving vertically under the action of external force.

[0053] Please see Figure 8 , Figure 9 and Figure 10 In one embodiment, a sliding groove 40 is provided on the inner wall of the sampling tube 4, a sealing plate 16 is slidably installed in the sliding groove 40, a fourth spring 17 is installed between the sealing plate 16 and the sliding groove 40, a trapezoidal block 15 is fixedly installed on the sealing plate 16, and the sampling tube 18 contacts the trapezoidal block 15 during rotation.

[0054] In this embodiment, water inlets are provided on the inner outer walls of the sampling chamber 43 and the transfer chamber 44, and the sealing plate 16 blocks the water inlets of the sampling chamber 43 and the transfer chamber 44.

[0055] When the sampling tube 18 rotates, the sampling tube 18 contacts the trapezoidal block 15, first descending, then remaining stationary, and then rising. When the sampling tube 18 contacts one side of the inclined surface of the trapezoidal block 15, the sampling tube 18 squeezes the sealing plate 16 downward, causing the water inlet to open. When the sampling tube 18 contacts the top surface of the trapezoidal block 15, the sampling tube 18 can drain water to the transfer chamber 44 and the sampling chamber 43. When the sampling tube 18 contacts the other side of the inclined surface of the trapezoidal block 15, the sealing plate 16 closes under the action of the fourth spring 17.

[0056] Please see Figure 11 , Figure 12 and Figure 13 In one embodiment, a support frame 19 is fixedly installed on the sampling tube 18, a power box 5 is fixedly installed on the mounting cylinder 1, the power box 5 is rotatably connected to the movable tube 13, the support frame 19 is slidably installed on the power box 5, and a telescopic tube 14 is fixedly installed between the sampling tube 18 and the movable tube 13.

[0057] In this embodiment, the telescopic tube 14 is located on the side of the support frame 19 away from the sampling tube 18. The drive assembly 6 includes a drive gear 61, a driven gear 63, and a motor 62. The motor 62 and the water pump are located inside the power box 5. The drive gear 61 is installed at the output end of the motor 62. The driven gear 63 is fixedly installed on the movable tube 13. The driven gear 63 is meshed with the drive gear 61.

[0058] The distance between the sampling tube 18 and the sampling cylinder 4 can be adjusted by the telescopic tube 14, which facilitates the installation of the sampling cylinder 4.

[0059] Please see Figure 11 , Figure 12 and Figure 13 In one embodiment, the power box 5 is provided with a rotating groove 51 and a retraction groove 53. When sampling is performed, one end of the support frame 19 is located in the rotating groove 51, and the retraction groove 53 is L-shaped. When the sampling cylinder 4 is installed or removed, one end of the support frame 19 is located in the retraction groove 53. An arc plate 55 is elastically installed on the power box 5. The arc plate 55 fits against the support frame 19 under relaxed conditions.

[0060] In this embodiment, the rotating groove 51 is connected to the retraction groove 53, a fixing plate 52 is installed on the surface of the power box 5, and a second spring 54 is connected between the fixing plate 52 and the arc plate 55.

[0061] One end of the support frame 19 is rotatably mounted with a roller 190, which is located in the rotation groove 51 or the retraction groove 53.

[0062] When installing the sampling cylinder 4, first push the sampling tube 18 to retract the telescopic tube 14 connected to the sampling tube 18, so that the roller 190 on the support frame 19 enters the relief groove 53. The actual movement trajectory is an L-shaped trajectory. During the movement, the arc plate 55 is always close to the support frame 19. At this time, the position of the support frame 19 and the sampling tube 18 can be fixed, so that the distance between the sampling tube 18 and the installation cylinder 1 is increased, which facilitates the installation of the sampling cylinder 4.

[0063] Please see Figure 1 , Figure 14 In one embodiment, a conical cover 3 is provided at one end of the sinking cylinder 2, and a plurality of water leakage holes are also provided on the conical cover 3.

[0064] In this embodiment, the conical cover 3 can expand the suction space at the bottom of the suction pipe 8, thereby preventing weeds or algae at the bottom from clogging the suction pipe 8 or reducing the flow rate.

[0065] Please see Figure 14 , Figure 15 and Figure 16 In one embodiment, a plurality of segmented plates 20 are fixedly installed on the sinking cylinder 2, and floating plates 9 are movably installed on both sides of the segmented plates 20. When the segmented plates 20 are in contact with the floating plates 9 on both sides, the water pump is started.

[0066] In this embodiment, the prior art generally uses the method of inserting the sampling device into the water body to sample at different depths. However, during the insertion of the sampling device, the water at different depths is easily mixed, resulting in inaccurate sampling depth. Based on this, in this embodiment, sampling is carried out while inserting the device. When the device is inserted to a predetermined depth, the float 9 receives buoyancy and floats up, causing the float 9 below to fit with the segmented plate 20. Therefore, the water pump is started at this time to sample the water body at the predetermined depth. The segmented plates 20 are set within the predetermined depth and are evenly distributed.

[0067] Please see Figure 16 , Figure 17 In one embodiment, a wedge-shaped column 21 is movably installed on the drainage hole between the adjacent float plate 9 and the segment plate 20 in the sinking cylinder 2, and an mounting base 22 is fixedly installed on the sinking cylinder 2. A first spring 24 is installed between the mounting base 22 and the wedge-shaped column 21.

[0068] In this embodiment, a rotating disk 25 is rotatably mounted on the mounting base 22, and a telescopic rod 23 is fixedly mounted on the rotating disk 25. One end of the telescopic rod 23 is slidably connected to the wedge-shaped column 21, and a knob 26 is fixedly mounted on the rotating disk 25.

[0069] By setting up several segmented plates 20 and floating plates 9, sampling at different depths can be achieved. The segmented plates 20 and floating plates 9 form a parallel circuit. Both the floating plates 9 and the segmented plates 20 are provided with conductors. When the sampling depth interval is greater than the distance between adjacent segmented plates 20, it is necessary to cancel the sampling depth of some segmented plates 20 and floating plates 9.

[0070] For example, if the distance between the segment plates 20 is 20cm and the required depth is 40cm, the corresponding rotating disk 25 can be rotated by the knob 26 so that the arc surface of the wedge column 21 is aligned with the position of the float 9 below. At this time, the float 9 will be blocked by the arc surface of the wedge column 21 during the upward process, so it cannot fit with the segment plate 20 above, and thus cannot perform sampling at that depth.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0072] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and 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 sampling device for water pollution detection, comprising a submerged cylinder and an mounting cylinder, wherein a suction pipe is installed inside the submerged cylinder, an mounting cylinder is installed at one end of the submerged cylinder, and a plurality of drainage holes are formed on the surface of the submerged cylinder, characterized in that, It also includes a drive assembly, a movable tube is rotatably mounted at one end of the suction tube, a water pump is mounted on the movable tube, the movable tube is connected to the suction tube, a sampling tube is mounted at one end of the movable tube, the drive assembly is connected to the movable tube, and the drive assembly is used to drive the movable tube to rotate. A sampling cylinder is detachably mounted on the mounting cylinder. The sampling cylinder is generally annular, and its outer wall is in contact with the water outlet end of the sampling tube. The sampling cylinder is provided with several sampling chambers and a transfer chamber. The sampling chambers and the transfer chamber are adjacent to each other. A through groove is provided in the transfer chamber. A liquid collection chamber is provided below the sampling chambers and the transfer chamber. The transfer chamber and the liquid collection chamber are connected through the through groove. A load-bearing plate is provided between the liquid collection chamber and the sampling chamber and the transfer chamber. The load-bearing plate separates the liquid collection chamber from the sampling chamber and the liquid collection chamber from the transfer chamber. The outer side of the load-bearing plate is inclined towards the sinking cylinder. Sealing plates are slidably installed on the inner walls of the sampling chamber and the transfer chamber.

2. The sampling device for water pollution detection according to claim 1, characterized in that, A third spring is installed between the sampling cylinder and the mounting cylinder, and a mounting cover is detachably installed on the mounting cylinder.

3. The sampling device for water pollution detection according to claim 1, characterized in that, A first drain pipe is provided on the outer wall of the sampling chamber, and a second drain pipe is provided on the outer wall of the liquid collection chamber. Both the first drain pipe and the second drain pipe are equipped with valves.

4. A sampling device for water pollution detection according to claim 1, characterized in that, A sliding groove is provided on the inner wall of the sampling tube, and a sealing plate is slidably installed in the sliding groove. A fourth spring is installed between the sealing plate and the sliding groove. A trapezoidal block is fixedly installed on the sealing plate, and the sampling tube contacts the trapezoidal block during rotation.

5. A sampling device for water pollution detection according to claim 1 or 4, characterized in that, A support frame is fixedly installed on the sampling tube, a power box is fixedly installed on the mounting cylinder, the power box is rotatably connected to the movable tube, the support frame is slidably installed on the power box, and a telescopic tube is fixedly installed between the sampling tube and the movable tube.

6. A sampling device for water pollution detection according to claim 5, characterized in that, The power box is provided with a rotating groove and a retraction groove. When sampling is performed, one end of the support frame is located in the rotating groove. The retraction groove is L-shaped. When the sampling cylinder is installed or removed, one end of the support frame is located in the retraction groove. An arc-shaped plate is elastically installed on the power box. The arc-shaped plate fits against the support frame under relaxed conditions.

7. A sampling device for water pollution detection according to claim 1, characterized in that, One end of the sinking cylinder is provided with a conical cover, and the conical cover is also provided with several water leakage holes.

8. A sampling device for water pollution detection according to claim 1 or 7, characterized in that, Several segmented plates are fixedly installed on the sinking cylinder, and floating plates are movably installed on both sides of each segmented plate. When the segmented plate is in contact with the floating plates on both sides, the water pump is started.

9. A sampling device for water pollution detection according to claim 8, characterized in that, A wedge-shaped column is movably installed on the drainage hole between the adjacent float plate and the segment plate of the sinking cylinder. An installation base is fixedly installed on the sinking cylinder, and a first spring is installed between the installation base and the wedge-shaped column.

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