A multi-depth sampling device for sewage detection and a method of use

Abstract

The present invention relates to the technical field of sewage detection sampling, specifically to a multi-depth sampling device for sewage detection and a method of use, comprising a sampling tube, wherein a water inlet hole is provided on the side surface of the sampling tube. The multi-depth sampling device for sewage detection and the method of use gradually squeeze the film to deform and compress the space inside the sampling tube through water pressure, and push the sample bottle on the upper side to move upward. When the inlet on the sample bottle is aligned with the water inlet hole, external sewage flows into the sample bottle along the water inlet hole and the inlet. As the depth increases, the water pressure increases, the shrinkage degree of the film increases, and each sample bottle is pushed to align with the water inlet hole one by one to enter water. Compared with the existing method of using the weight of the incoming water to press open the lower water inlet, the above-mentioned sampling of the sample bottle and the water inlet hole is mainly driven by water pressure, so that each sample bottle is interlocked with the water depth, and sampling is automatically completed according to different depths, without the operator manually controlling the water immersion depth of the equipment to adapt to the sampling, and the convenience of use is better.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage detection and sampling, and in particular to a multi-depth sampling sewage detection sampling device and a use method thereof. Background Art

[0002] Sewage is water that has deteriorated and can no longer maintain its original function due to the addition of new substances or changes in external conditions. From the perspective of the source of sewage, sewage can be defined as liquid or water mixed with groundwater, surface water, etc. and carrying waste that is discharged from residential, institutional, commercial or industrial areas. Therefore, water quality monitoring has become an important issue. During the sewage purification process, people need to take samples of sewage for testing to ensure that the right medicine is used.

[0003] The existing patent (publication number: CN117419970B) discloses an auxiliary sampling device for sewage detection; including: a sampling tube, the upper and lower ends of the sampling tube are both set as a closed structure, and the interior of the sampling tube is provided with a plurality of sampling chambers along its height direction, the adjacent sampling chambers are isolated by a sealing plate, and each sampling chamber is provided with a water inlet; a valve plate that can move up and down is connected to the water inlet, wherein the water inlet of the first layer is not provided with a valve plate, the valve plate is used to close the water inlet, and a lifting seat that can be lifted and lowered is connected to the sampling chamber, the lifting seat is sealed with the inner wall of the sampling tube, and the lifting seat is arranged below the water inlet; a connecting rod is fixedly connected to the lower surface of the lifting seat, the connecting rod extends to the adjacent lower sampling chamber, and the lower end of the connecting rod is connected to the valve plate in the adjacent lower sampling chamber. In the above-mentioned prior art, the next sampling process is opened by relying on the weight of the sample, and the operator needs to manually and accurately control the opening of the water inlet to adapt to the water depth, and it is easy to cause different sampling chambers to sample the same sample, which is not convenient to use.

[0004] In view of this, we propose a multi-depth sampling device for sewage detection and a method of use. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-depth sampling device for sewage detection and a method of use, so as to solve the problem that the prior art proposed in the above background technology relies on the weight of the sample to start the next sampling process, requires the operator to manually and accurately control the opening of the water inlet to adapt to the water depth, and easily leads to different sampling chambers sampling the same sample, which is inconvenient to use. To achieve the above purpose, the present invention provides the following technical solutions: a multi-depth sampling device for sewage detection, including a sampling barrel, a water inlet hole is opened on the side surface of the sampling barrel, and a sample bottle matching the water inlet hole is arranged inside the sampling barrel, and a depth controller is arranged on the sampling barrel and the sample bottle.

[0006] The depth controller includes a fixing ring fixedly arranged inside the sampling barrel, and the number of the fixing rings is set to two, the two fixing rings are located at the lower side of the sampling barrel, and a rubber film is fixedly connected between the two fixing rings, and a pressure port matching the rubber film is opened on the side surface of the sampling barrel.

[0007] The number of the sample bottles is set to be several, and the sample bottles are located on the upper side of the adhesive film and are slidably connected along the sampling tube. The surface of the sample bottle is provided with an inlet matched with the water inlet hole.

[0008] A non-return spring sheet matched with the sample bottle is fixedly arranged on the upper side of the inner wall of the sampling tube.

[0009] The sampling tube is provided with an external flushing component matched with the water inlet hole.

[0010] Preferably, the external flushing assembly includes a pull rod movably inserted into the bottom of the sampling tube, and an internal bracket is fixedly provided inside the sampling tube, a tension spring is provided between the internal bracket and the pull rod, and the tension spring pulls the pull rod to move upward.

[0011] The bottom of the sampling tube is rotatably connected to a rotating seat, and a through hole is opened at the center of the rotating seat. The pull rod is inserted into the through hole, and a plurality of shifting teeth are fixedly arranged on the surface of the pull rod. The through hole has a ring array with a plurality of oblique teeth matching with the shifting teeth.

[0012] The outside of the sampling tube is fixedly connected with an outer cover through an external bracket, and the outer ring of the rotary seat is fixedly connected with a plurality of blades with a spiral structure, and the blades are located between the inner wall of the outer cover and the outer wall of the sampling tube.

[0013] The sampling cylinder and the sample bottle are provided with internal flushing components.

[0014] Preferably, the internal flushing component comprises a vertical groove formed on the inner side wall of the sampling tube, and a protrusion corresponding to the vertical groove is fixedly provided on the side surface of the sample bottle, and the protrusion is slidably connected in the vertical groove.

[0015] The side surface of the sampling tube is provided with a backflush hole, and a drainage plate is fixedly arranged on the surface of the sampling tube above the backflush hole. The backflush hole and the water inlet hole are symmetrically distributed, and the surface of the sample bottle is provided with two symmetrically distributed flushing holes.

[0016] The vertical groove is arranged relative to the backwash hole and the water inlet hole as a spiral inclined groove of a V-shaped structure.

[0017] Preferably, the top of the sampling tube is configured as a hollow structure, and a hanging ring is threadedly connected to the top of the sampling tube.

[0018] Preferably, the outer surface of the sampling tube is provided with a through opening corresponding to the anti-return spring sheet, and a dial button is fixedly provided on the anti-return spring sheet.

[0019] Preferably, a connecting seat is fixedly provided at the bottom end of the pull rod.

[0020] Preferably, a through hole is provided at the bottom of the sampling cylinder, the pull rod is located in the through hole, and a one-way damper matching with the pull rod is provided in the through hole.

[0021] A method for using a multi-depth sampling device for sewage detection comprises the following steps:

[0022] S1. Place the sampling tube into the sewage to be sampled. The water pressure gradually squeezes the film to deform inward. The shrinking film compresses the space inside the sampling tube and pushes the sample bottle on its upper side to move upward. When the inlet on the sample bottle is aligned with the water inlet hole, the external sewage flows into the sample bottle along the water inlet hole and the inlet. At the same time, the upward-moving sample bottle is limited by the anti-return spring and will not move downward to leak the sample. As the depth increases, the water pressure increases, the shrinkage degree of the film increases, and each sample bottle is pushed to align with the water inlet hole one by one to enter water.

[0023] S2. Before the sampling tube enters the water, the pull rod is pulled out along the sampling tube. After the sampling tube enters the water, the internal tension spring pulls the pull rod back at a low speed. During this process, the pull teeth push the rotating seat and the blades along the oblique teeth to rotate, and pump the water on the lower side upward along the outer cover;

[0024] S3. When the sample bottle moves up in the sampling tube and is aligned with the water inlet hole, the protrusion simultaneously slides into the spiral inclined groove along the vertical groove, and drives the sample bottle aligned with the water inlet hole to rotate 90° clockwise in the lower part of the groove body. At this time, the sampling inlet is sealed with the inner wall of the sampling tube, and the flushing holes on both sides are aligned with the water inlet hole and the backflush hole respectively. The water sprayed on the blade is guided by the drainage plate and rushes out of the sample bottle along the backflush hole, the flushing hole and the water inlet hole. Then the protrusion drives the sample bottle aligned with the water inlet hole to rotate 90° counterclockwise in the upper part of the groove body to reset.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the present invention, the rubber film is gradually squeezed and deformed into the tube by water pressure, and the inwardly shrunk rubber film compresses the space in the sampling tube and pushes the sample bottle on its upper side to move upward. When the inlet on the sample bottle is aligned with the water inlet hole, external sewage flows into the sample bottle along the water inlet hole and the inlet. As the depth increases, the water pressure increases, the degree of shrinkage of the rubber film increases, and each sample bottle is pushed to align with the water inlet hole one by one to let water in. Compared with the existing method of using the weight of the incoming water to press open the lower water inlet, the above-mentioned sampling of the sample bottle and the water inlet hole is mainly driven by water pressure, so that each sample bottle is interlocked with the water depth and sampling is automatically completed according to different depths. There is no need for the operator to manually control the water immersion depth of the equipment to adapt to the sampling, and the convenience of use is better.

[0027] In the present invention, the rotating seat and the blades are pushed to rotate along the oblique teeth by the shifting teeth, and the water on the lower side is pumped upward along the outer cover. Compared with the existing exposed water inlet structure, the above-mentioned blades can, on the one hand, suck the sewage at the current depth to flush the water inlet hole and the cylinder wall around it, so as to remove the upper sewage and residue that may exist in the water inlet hole area and avoid sample contamination between sewage of different depths. On the other hand, the upward sprayed water flow can push the sampling tube to sink, and assist the sampling tube to reach the regional water depth faster.

[0028] In the present invention, the protrusion synchronously slides into the spiral inclined groove along the vertical groove, and drives the sample bottle aligned with the water inlet hole to rotate 90° clockwise in the lower part of the groove body. At this time, the sampling inlet is sealed with the inner wall of the sampling tube, and the flushing holes on both sides are aligned with the water inlet hole and the backflush hole respectively. The water sprayed on the blade is guided by the drainage plate, and rushes out of the sample bottle along the backflush hole, the flushing hole and the water inlet hole. Then the protrusion drives the sample bottle aligned with the water inlet hole to rotate 90° counterclockwise and reset in the upper part of the groove body. Compared with the existing sample storage components, the sample bottle for storing samples cooperates with the blades, and the sample bottle and the water inlet hole can be reversely flushed with the water in the water area where the sample is located before sampling, which not only avoids contamination caused by residual samples in the sample bottle, but also does not require the user to manually clean the stored samples after each sampling, thereby improving the sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 3 It is a schematic diagram of the structure of the outer cover and the sampling tube of the present invention;

[0032] Figure 4 It is a partial cross-sectional view of the sampling tube of the present invention;

[0033] Figure 5 The explosion of the sampling tube and the sample bottle of the present invention Figure 1 ;

[0034] Figure 6 The explosion of the sampling tube and the sample bottle of the present invention Figure 2 ;

[0035] Figure 7 For the present invention Figure 7 The enlarged view of point A in the middle;

[0036] Figure 8 For the present invention Figure 7 The enlarged view of point B in the middle;

[0037] Fig. 9It is a schematic diagram of the three-dimensional structure of the sampling tube, the vertical groove and the spiral inclined groove of the present invention;

[0038] Fig.10 It is a three-dimensional structural cross-sectional view of the sample bottle of the present invention.

[0039] In the figure: 1. sampling tube; 2. water inlet; 3. sample bottle; 4. depth controller; 41. fixing ring; 42. adhesive film; 43. pressure port; 44. inlet; 45. anti-return spring; 46. external flushing assembly; 461. pull rod; 462. internal bracket; 463. tension spring; 464. rotary seat; 465. through-hole; 466. shifting teeth; 467. oblique teeth; 468. outer cover; 469. blades; 4610. internal flushing assembly; 46101. vertical groove; 46102. bump; 46103. recoil hole; 46104. drainage plate; 46105. flushing hole; 46106. spiral bevel groove. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 technical staff in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figures 1 to 10 The present invention provides a technical solution: a multi-depth sampling device for sewage detection, comprising a sampling tube 1, a water inlet hole 2 is opened on the side surface of the sampling tube 1, and a sample bottle 3 matched with the water inlet hole 2 is arranged inside the sampling tube 1. The sampling tube 1 is placed in the sewage to be sampled, and the sewage flows into the sample bottle 3 along the water inlet hole 2 for sampling. A depth controller 4 is arranged on the sampling tube 1 and the sample bottle 3.

[0042] The depth controller 4 includes a fixing ring 41 fixedly arranged inside the sampling tube 1, and the number of the fixing rings 41 is set to two, the two fixing rings 41 are located at the lower side of the sampling tube 1, and a rubber film 42 is fixedly connected between the two fixing rings 41, and a pressure port 43 matching with the rubber film 42 is opened on the side surface of the sampling tube 1. After the sampling tube 1 is placed in sewage, the water pressure gradually squeezes the rubber film 42 along the pressure port 43 to deform into the tube, and the inwardly shrunk rubber film 42 compresses the space inside the sampling tube 1.

[0043] The number of sample bottles 3 is set to be several, and the sample bottles 3 are located on the upper side of the adhesive film 42 and are slidably connected along the sampling tube 1 . An inlet 44 matching the water inlet hole 2 is opened on the surface of the sample bottle 3 .

[0044] A non-return spring piece 45 cooperating with the sample bottle 3 is fixedly provided on the upper side of the inner wall of the sampling tube 1, and the inwardly contracted rubber film 42 pushes the upper sample bottle 3 to move upward. When the inlet 44 on the sample bottle 3 is aligned with the water inlet hole 2, the external sewage flows into the sample bottle 3 along the water inlet hole 2 and the inlet 44. At the same time, the upwardly moving sample bottle 3 is limited by the non-return spring piece 45 and will not move downward to leak the sample.

[0045] The sampling tube 1 is provided with an external flushing component 46 which matches with the water inlet hole 2 .

[0046] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the external flushing assembly 46 includes a pull rod 461 movably inserted into the bottom of the sampling tube 1, and an internal bracket 462 is fixedly arranged inside the sampling tube 1, a tension spring 463 is arranged between the internal bracket 462 and the pull rod 461, and the tension spring 463 pulls the pull rod 461 upward to pull the pull rod 461 out along the sampling tube 1. After the sampling tube 1 enters the water, the internal tension spring 463 pulls the pull rod 461 back at a low speed.

[0047] The bottom of the sampling tube 1 is rotatably connected to a rotary seat 464, and a through hole 465 is opened at the center of the rotary seat 464. The pull rod 461 is inserted into the through hole 465, and a plurality of shifting teeth 466 are fixedly provided on the surface of the pull rod 461. The through hole 465 has a ring array with a plurality of bevel teeth 467 that match the shifting teeth 466.

[0048] The outside of the sampling tube 1 is fixedly connected to an outer cover 468 via an external bracket, and the outer ring of the rotary seat 464 is fixedly connected to a plurality of spiral blades 469, and the blades 469 are located between the inner wall of the outer cover 468 and the outer wall of the sampling tube 1. During the low-speed return process of the pull rod 461, the shifting teeth 466 push the rotary seat 464 and the blades 469 to rotate along the oblique teeth 467, and pump the water on the lower side upward along the outer cover 468.

[0049] An internal flushing component 4610 is provided on the sampling tube 1 and the sample bottle 3.

[0050] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the internal flushing component 4610 includes a vertical groove 46101 opened on the inner wall of the sampling tube 1, and a protrusion 46102 corresponding to the vertical groove 46101 is fixedly provided on the side surface of the sample bottle 3, and the protrusion 46102 is slidably connected in the vertical groove 46101.

[0051] A recoil hole 46103 is provided on the side surface of the sampling tube 1, and a drainage plate 46104 is fixedly provided on the surface of the sampling tube 1 on the upper side of the recoil hole 46103. The recoil hole 46103 and the water inlet hole 2 are symmetrically distributed. Two symmetrically distributed flushing holes 46105 are provided on the surface of the sample bottle 3. After the sample bottle 3 is rotated 90° clockwise, the sampling inlet 44 is fitted and closed with the inner wall of the sampling tube 1, and the flushing holes 46105 on both sides are respectively aligned with the water inlet hole 2 and the recoil hole 46103. The water sprayed on the blade 469 is guided by the drainage plate 46104 and flushed out of the sample bottle 3 along the recoil hole 46103, the flushing hole 46105 and the water inlet 2.

[0052] The vertical groove 46101 is set as a spiral inclined groove 46106 with a V-shaped structure relative to the recoil hole 46103 and the water inlet hole 2. When the sample bottle 3 moves up in the sampling tube 1 and aligns with the water inlet hole 2, the protrusion 46102 slides into the spiral inclined groove 46106 along the vertical groove 46101, and drives the sample bottle 3 aligned with the water inlet hole 2 to rotate 90° clockwise in the lower part of the groove body, and then the protrusion 46102 drives the sample bottle 3 aligned with the water inlet hole 2 to rotate 90° counterclockwise in the upper part of the groove body to reset.

[0053] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the top of the sampling tube 1 is set as a hollow structure, and the top of the sampling tube 1 is threadedly connected with a hanging ring. Before the sampling tube 1 enters the water, it is connected along the hanging ring with a steel cable, and then the sampling tube 1 is put into the water.

[0054] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the outer surface of the sampling tube 1 is provided with a through hole corresponding to the anti-return spring piece 45, and a dial button is fixedly provided on the anti-return spring piece 45. Pressing the dial button can push the anti-return spring piece 45 to deform and release the limit on the upper sample bottle 3.

[0055] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, a connecting seat is fixedly provided at the bottom end of the pull rod 461 , and the operator can use a traction device to connect along the connecting seat to assist in pulling out the pull rod 461 .

[0056] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, a through hole is opened at the bottom of the sampling tube 1, the pull rod 461 is located in the through hole, and a one-way damper matching the pull rod 461 is arranged in the through hole. When the pull rod 461 is pulled outward, it is not affected by the one-way damper. When the pull rod 461 is pulled back by the tension spring 463, the one-way damper will reduce the moving speed of the pull rod 461 to avoid the pull rod 461 being quickly reset before the sampling tube 1 enters the water.

[0057] A method for using a multi-depth sampling device for sewage detection comprises the following steps:

[0058] S1. Place the sampling tube 1 into the sewage to be sampled. The water pressure gradually squeezes the rubber film 42 to deform inward. The inwardly contracted rubber film 42 compresses the space inside the sampling tube 1 and pushes the sample bottle 3 on its upper side to move upward. When the inlet 44 on the sample bottle 3 is aligned with the water inlet hole 2, the external sewage flows into the sample bottle 3 along the water inlet hole 2 and the inlet 44. At the same time, the upwardly moving sample bottle 3 is limited by the anti-return spring piece 45 and will not move downward to leak the sample. As the depth increases, the water pressure increases, the degree of inward contraction of the rubber film 42 increases, and pushes each sample bottle 3 to align with the water inlet hole 2 one by one to inlet water.

[0059] S2. Before the sampling tube 1 enters the water, the pull rod 461 is pulled out along the sampling tube 1. After the sampling tube 1 enters the water, the internal tension spring 463 pulls the pull rod 461 back at a low speed. During this process, the shifting tooth 466 pushes the rotating seat 464 and the blade 469 to rotate along the oblique tooth 467, and pumps the water on the lower side upward along the outer cover 468.

[0060] S3. When the sample bottle 3 moves up in the sampling tube 1 and is aligned with the water inlet hole 2, the protrusion 46102 synchronously slides into the spiral inclined groove 46106 along the vertical groove 46101, and drives the sample bottle 3 aligned with the water inlet hole 2 to rotate 90° clockwise in the lower part of the groove body. At this time, the sampling inlet 44 is fitted and closed with the inner wall of the sampling tube 1, and the flushing holes 46105 on both sides are aligned with the water inlet hole 2 and the backflush hole 46103 respectively. The water flow sprayed on the blade 469 is guided by the guide plate 46104, and rushes out of the sample bottle 3 along the backflush hole 46103, the flushing hole 46105, and the water inlet hole 2. Then the protrusion 46102 drives the sample bottle 3 aligned with the water inlet hole 2 to rotate 90° counterclockwise in the upper part of the groove body to reset.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit 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. A multi-depth sampling device for sewage detection, comprising a sampling tube (1), characterized in that: A water inlet hole (2) is provided on the side surface of the sampling tube (1), and a sample bottle (3) matching the water inlet hole (2) is provided inside the sampling tube (1), and a depth controller (4) is provided on the sampling tube (1) and the sample bottle (3); The depth controller (4) comprises a fixing ring (41) fixedly arranged inside the sampling tube (1), and the number of the fixing rings (41) is set to two, the two fixing rings (41) are located at the lower side of the sampling tube (1), and a rubber film (42) is fixedly connected between the two fixing rings (41), and a pressure port (43) matching with the rubber film (42) is provided on the side surface of the sampling tube (1); The number of the sample bottles (3) is set to be several, and the sample bottles (3) are located on the upper side of the adhesive film (42) and are slidably connected along the sampling tube (1), and the surface of the sample bottle (3) is provided with an inlet (44) that matches the water inlet hole (2); A non-return spring (45) which cooperates with the sample bottle (3) is fixedly provided on the upper side of the inner wall of the sampling tube (1); The sampling tube (1) is provided with an external flushing component (46) that matches the water inlet hole (2); The external flushing assembly (46) comprises a pull rod (461) movably inserted into the bottom of the sampling tube (1), and an internal bracket (462) is fixedly arranged inside the sampling tube (1), a tension spring (463) is arranged between the internal bracket (462) and the pull rod (461), and the tension spring (463) pulls the pull rod (461) to move upward; The bottom of the sampling tube (1) is rotatably connected to a rotating seat (464), and a through hole (465) is provided at the center of the rotating seat (464). The pull rod (461) is inserted into the through hole (465), and a plurality of shifting teeth (466) are fixedly provided on the surface of the pull rod (461). The through hole (465) has a plurality of bevel teeth (467) in a ring array that match the shifting teeth (466). The outside of the sampling tube (1) is fixedly connected to an outer cover (468) via an external bracket, and the outer ring of the rotary seat (464) is fixedly connected to a plurality of blades (469) with a spiral structure, and the blades (469) are located between the inner wall of the outer cover (468) and the outer wall of the sampling tube (1); The sampling cylinder (1) and the sample bottle (3) are provided with an internal flushing component (4610); The internal flushing assembly (4610) comprises a vertical groove (46101) formed on the inner wall of the sampling tube (1); a protrusion (46102) corresponding to the vertical groove (46101) is fixedly provided on the side surface of the sample bottle (3), and the protrusion (46102) is slidably connected in the vertical groove (46101); The side surface of the sampling tube (1) is provided with a backflush hole (46103), and a drainage plate (46104) is fixedly provided on the surface of the sampling tube (1) on the upper side of the backflush hole (46103), the backflush hole (46103) and the water inlet hole (2) are symmetrically distributed, and the surface of the sample bottle (3) is provided with two symmetrically distributed flushing holes (46105); The vertical groove (46101) is provided with a spiral inclined groove (46106) of a V-shaped structure relative to the recoil hole (46103) and the water inlet hole (2).

2. A multi-depth sampling device for sewage detection according to claim 1, characterized in that: The top of the sampling tube (1) is configured as a hollow structure, and a hanging ring is threadedly connected to the top of the sampling tube (1).

3. A multi-depth sampling device for sewage detection according to claim 2, characterized in that: The outer surface of the sampling tube (1) is provided with a through opening corresponding to the anti-return spring sheet (45), and a dial button is fixedly provided on the anti-return spring sheet (45).

4. The multi-depth sampling device for sewage detection according to claim 3 is characterized in that: A connecting seat is fixedly provided at the bottom end of the pull rod (461).

5. The multi-depth sampling device for sewage detection according to claim 4 is characterized in that: A through hole is provided at the bottom of the sampling tube (1), the pull rod (461) is located in the through hole, and a one-way damper matching the pull rod (461) is provided in the through hole.

6. The method for using the multi-depth sampling device for sewage detection according to claim 5 comprises the following steps: S1. Place the sampling tube (1) into the sewage to be sampled. The water pressure gradually squeezes the rubber film (42) to deform inwardly. The shrinking rubber film (42) compresses the space inside the sampling tube (1) and pushes the sample bottle (3) on the upper side thereof to move upwardly. When the inlet (44) on the sample bottle (3) is aligned with the water inlet hole (2), the external sewage flows into the sample bottle (3) along the water inlet hole (2) and the inlet (44). At the same time, the upwardly moving sample bottle (3) is limited by the anti-return spring (45) and will not move downward to leak the sample. As the depth increases, the water pressure increases, the shrinkage degree of the rubber film (42) increases, and each sample bottle (3) is pushed to align with the water inlet hole (2) one by one to inlet water. S2. Before the sampling tube (1) enters the water, the pull rod (461) is pulled out along the sampling tube (1). After the sampling tube (1) enters the water, the internal tension spring (463) pulls the pull rod (461) back at a low speed. During this process, the puller teeth (466) push the rotating seat (464) and the blades (469) along the oblique teeth (467) to rotate, and pump the water on the lower side upward along the outer cover (468); S3. When the sample bottle (3) moves upward in the sampling tube (1) and is aligned with the water inlet hole (2), the protrusion (46102) simultaneously slides into the spiral inclined groove (46106) along the vertical groove (46101) and drives the sample bottle (3) aligned with the water inlet hole (2) to rotate 90° clockwise in the lower groove body. At this time, the sampling inlet (44) is sealed with the inner wall of the sampling tube (1), and the flushing holes (46102) on both sides are closed. 105) are aligned with the water inlet hole (2) and the backwash hole (46103), respectively. The water flow sprayed from the blade (469) is guided by the guide plate (46104) and flows out of the sample bottle (3) along the backwash hole (46103), the flushing hole (46105) and the water inlet hole (2). Then, the protrusion (46102) drives the sample bottle (3) aligned with the water inlet hole (2) to rotate 90° counterclockwise and reset in the upper groove body.

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