A stratified sampling device for wastewater detection

Abstract

The invention relates to the technical field of wastewater sampling equipment, and discloses a stratified sampling equipment for wastewater detection, comprising an installation platform, a support plate is arranged in the middle of the top of the installation platform, a drive motor is arranged on the top of the support plate, and the drive motor runs through the upper and lower ends of the support plate; the stratified sampling equipment for wastewater detection, by arranging a piston plate inside a sampling chamber, the wastewater squeezing force applied to the piston plate during the sampling process causes the gas inside the sampling chamber to be squeezed into the inside of an airbag, the airbag is inflated, and then the airbag is acted upon by the buoyancy of the wastewater, providing buoyancy for the sampling device, assisting the sampling device in moving upward, and at the same time, by filling the sampling chamber with sampled wastewater during the sampling process, positioning of the wastewater after sampling is completed is achieved under the action of the gravity of the wastewater, further saving the demand for peripheral power.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater sampling equipment, and more specifically, to a layered sampling equipment for wastewater detection. Background Art

[0002] Wastewater refers to the general term for water discharged during residential activities and runoff rainwater. It includes domestic sewage, industrial wastewater, and other unused water such as initial rain runoff into drainage pipes. It generally refers to water that cannot be recycled after certain technical treatment or water that cannot meet certain standards for purification after primary pollution. In order to protect the ecological environment, it is necessary to sample and test the wastewater to detect whether the content of the components in the wastewater meets the emission standards.

[0003] The existing wastewater sampling devices have various structures. In order to improve the accuracy of wastewater sampling, a variety of wastewater stratified sampling devices have also been designed. However, in actual use, the existing wastewater stratified sampling devices are sunk by installing a traction rope on the top of the device, and the device sinks under the action of its own gravity. After the sampling is completed, the sampling device is filled with sampled wastewater, resulting in an increase in the overall weight of the device. During the lifting process, a large power needs to be provided to lift the device from the wastewater. At the same time, the sampling device also needs to be powered by a drive device arranged on the sampling device during the sampling process in the wastewater. The power is usually a battery. Therefore, how to save power is an urgent problem to be solved by this equipment. Summary of the invention

[0004] The invention provides a stratified sampling device for wastewater detection, which solves the technical problem in the related art that a wastewater sampling device needs to consume a lot of power.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A stratified sampling device for wastewater detection, comprising a mounting platform, a support plate is arranged in the middle of the top of the mounting platform, a driving motor is arranged on the top of the supporting plate, and the driving motor runs through the upper and lower ends of the supporting plate, and a plurality of transmission mechanisms are evenly distributed at positions around the outer side of the supporting plate on the top of the mounting platform, and the transmission mechanism comprises a transmission shaft evenly distributed on the top of the mounting platform, the bottom end of the transmission shaft extends to the inside of the mounting platform, and a bearing seat is arranged between the outer side of the transmission shaft and the supporting plate;

[0007] Several groups of sampling bins are evenly distributed at the edge of the bottom of the installation platform, and the number of the sampling bins is consistent with the number of the transmission mechanism. The top of the sampling bin is provided with several groups of support slide rods penetrating to the top of the installation platform. The support slide rods are located on the outside of the top of the installation platform and are sleeved with springs A, and the bottom end of the spring A fits with the top of the installation platform;

[0008] The input end of the sampling chamber is provided with a second water inlet pipe, and the second water inlet pipe has an extensible characteristic, the other end of the second water inlet pipe is connected with the first water inlet pipe, the interior of the first water inlet pipe is provided with a water inlet control mechanism, and two groups of air bags are symmetrically arranged at positions on both sides of the first water inlet pipe on the top of the mounting platform, and the input end of the air bag is connected with the sampling chamber;

[0009] A piston exhaust mechanism is provided inside the sampling chamber, and the piston exhaust mechanism is used to squeeze the gas inside the sampling chamber into the interior of the airbag. A drain pipe is provided at the output end of the sampling chamber, and a drain valve is provided at the output end of the drain pipe.

[0010] An outer sleeve shaft is sleeved on the bottom of the outer side of the transmission shaft, the bottom of the outer sleeve shaft penetrates to the bottom of the mounting platform, and the bottom of the outer sleeve shaft is fixedly connected to the bottom of the sampling chamber.

[0011] As a further optimization scheme of the present invention, the transmission mechanism also includes a driving shaft arranged at the output end of the driving motor, an incomplete gear is arranged on the outer side of the driving shaft, a gear that matches the incomplete gear is arranged on the top of the transmission shaft, external protrusions are evenly distributed on the bottom of the outer side of the transmission shaft, and internal grooves that match the external protrusions are evenly distributed on the top of the inner wall of the outer sleeve shaft.

[0012] As a further optimization scheme of the present invention, a displacement through hole compatible with the transmission shaft and the outer sleeve shaft is arranged inside the mounting platform, the transmission shaft rotates inside the displacement through hole, the outer sleeve shaft displaces up and down inside the displacement through hole, and the outer sleeve shaft slides up and down on the outside of the transmission shaft, and a connecting plate is arranged between the bottom of the outside of the outer sleeve shaft and the sampling chamber, and when the sampling chamber displaces, the outer sleeve shaft is driven to follow the displacement through the connecting plate.

[0013] As a further optimization scheme of the present invention, the water inlet control mechanism includes a spring C arranged at one end inside the first water inlet pipe, the other end of the spring C is provided with a pipe plug that fits the inner wall of the first water inlet pipe, and the middle part of the pipe plug near one end of the spring C is provided with a first traction rope that penetrates to the outside of the first water inlet pipe and is wrapped around the outside of the transmission shaft.

[0014] As a further optimization scheme of the present invention, the front end of the pipe plug is close to the water inlet port of the first water inlet pipe, the input end of the second water inlet pipe and the output end of the first water inlet pipe are connected to each other, and the pipe plug is located between the water inlet port and the output end of the first water inlet pipe, so that the sewage entering the first water inlet pipe is blocked by the pipe plug.

[0015] As a further optimization scheme of the present invention, the input end of the airbag is provided with an air pipe interconnected with the sampling chamber, and a one-way valve is provided at one end of the air pipe close to the sampling chamber, the air pipe has an extensible characteristic, and the front end of the airbag is provided with an air nozzle, through which the airbag can be inflated and deflated.

[0016] As a further optimization scheme of the present invention, the piston exhaust mechanism includes a piston plate arranged inside the sampling chamber, the outer side of the piston plate is in contact with the inner wall of the sampling chamber, a plurality of groups of springs B are evenly distributed on the back end of the piston plate, and the other end of the spring B is connected to the back end of the sampling chamber, a second traction rope extending to the outside of the sampling chamber and wound around the outside of the outer sleeve shaft is provided in the middle part of the back end of the piston plate, and a winding groove matching the second traction rope is provided on the outside of the outer sleeve shaft.

[0017] As a further optimization scheme of the present invention, an installation chamber is provided on the top of the drain valve, a piston groove is provided on the top of the installation chamber, and the piston groove is communicated with the interior of the sampling chamber, a buckle extending to the interior of the sampling chamber is provided inside the piston groove, and a spring D is provided at the bottom of the buckle, and the buckle slides up and down inside the piston groove and fits against the inner wall of the piston groove.

[0018] As a further optimization scheme of the present invention, a control valve core connected to the internal thread of the drain valve is provided at the bottom of the drain valve, and a connecting rope is provided on the top of the control valve core, and the other end of the connecting rope extends to the interior of the piston groove and is connected to the bottom of the buckle.

[0019] As a further optimization scheme of the present invention, a protective cover is provided on the top of the mounting platform at the outer position of the gear, and the protective cover covers the gear and the incomplete gear on the inner side thereof, a suspension platform is provided on the top of the protective cover, and a support frame connected to the bottom of the suspension platform is provided at the edge position of the top of the mounting platform, and a battery pack electrically connected to the drive motor is provided inside the mounting platform.

[0020] The beneficial effects of the present invention are as follows: the present invention provides a piston plate inside the sampling chamber, and the wastewater squeezing force applied to the piston plate during the sampling process causes the gas inside the sampling chamber to be squeezed into the airbag, inflating the airbag, and then causing the airbag to be affected by the buoyancy of the wastewater, thereby providing buoyancy for the sampling device and assisting the sampling device in moving upward. At the same time, during the sampling process, the sampling chamber is filled with sampling wastewater, and the positioning of the wastewater after sampling is achieved under the action of the wastewater gravity, further saving the demand for peripheral power. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a three-dimensional structural cross-sectional view of the present invention;

[0023] Figure 3 It is an enlarged schematic diagram of the transmission mechanism and the sampling chamber in the present invention;

[0024] Figure 4 It is an enlarged schematic diagram of the airbag structure in the present invention;

[0025] Figure 5 It is an enlarged cross-sectional view of the transmission mechanism structure in the present invention;

[0026] Figure 6 It is an enlarged cross-sectional view of the structure of the outer sleeve shaft in the present invention;

[0027] Figure 7 It is an enlarged cross-sectional view of the internal structure of the sampling chamber in the present invention;

[0028] Figure 8 It is an enlarged cross-sectional view of the structure state of the sampling chamber after water inflow and sampling in the present invention;

[0029] Fig. 9 It is an enlarged cross-sectional view of the internal structure of the water inlet control mechanism of the present invention;

[0030] Fig.10 It is an enlarged cross-sectional view of the structural state when the first water inlet pipe enters the sampling in the present invention;

[0031] Fig.11 It is an enlarged cross-sectional view of the internal structure of the installation bin in the present invention.

[0032] In the figure: 1. installation platform; 2. first water inlet pipe; 3. suspension platform; 4. air bag; 5. support frame; 6. sampling chamber; 7. second water inlet pipe; 8. incomplete gear; 9. protective cover; 10. support slide rod; 11. air pipe; 12. outer sleeve shaft; 13. connecting plate; 14. spring A; 15. gear; 16. drive shaft; 17. support plate; 18. drive motor; 19. transmission shaft; 20. drain valve; 21. one-way valve; 22. first traction rope; 23. second traction rope; 24. outer protrusion; 25. winding groove; 26. inner groove; 27. spring B; 28. piston plate; 29. ​​installation chamber; 30. drain pipe; 31. pipe plug; 32. spring C; 33. control valve core; 34. connecting rope; 35. spring D; 36. buckle; 37. piston groove. DETAILED DESCRIPTION

[0033] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0034] Example 1

[0035] like Figures 1 to 11 As shown, a stratified sampling device for wastewater detection includes a mounting platform 1, a support plate 17 is arranged in the middle of the top of the mounting platform 1, a drive motor 18 is arranged on the top of the support plate 17, and the drive motor 18 runs through the upper and lower ends of the support plate 17, and a plurality of transmission mechanisms are evenly distributed at the top of the mounting platform 1 around the outer side of the support plate 17. The transmission mechanism includes a transmission shaft 19 evenly distributed on the top of the mounting platform 1, and the bottom end of the transmission shaft 19 extends to the inside of the mounting platform 1, and a bearing seat is arranged between the outer side of the transmission shaft 19 and the support plate 17. The transmission mechanism also includes a drive shaft 16 arranged at the output end of the drive motor 18, and an incomplete gear is arranged on the outer side of the drive shaft 16. Wheel 8, the top of the transmission shaft 19 is provided with a gear 15 which is compatible with the incomplete gear 8, the bottom of the outer side of the transmission shaft 19 is evenly distributed with external protrusions 24, and the top of the inner wall of the outer sleeve shaft 12 is evenly distributed with internal grooves 26 which are compatible with the external protrusions 24, and the interior of the mounting platform 1 is provided with a displacement through hole which is compatible with the transmission shaft 19 and the outer sleeve shaft 12, the transmission shaft 19 rotates inside the displacement through hole, the outer sleeve shaft 12 moves up and down inside the displacement through hole, and the outer sleeve shaft 12 slides up and down on the outer side of the transmission shaft 19, and a connecting plate 13 is jointly provided between the bottom of the outer side of the outer sleeve shaft 12 and the sampling chamber 6, and when the sampling chamber 6 moves, the outer sleeve shaft 12 is driven to follow the displacement through the connecting plate 13,

[0036] A protective cover 9 is provided at the top of the mounting platform 1 at the outer side of the gear 15, and the protective cover 9 covers the gear 15 and the incomplete gear 8 on its inner side. A suspension platform 3 is provided on the top of the protective cover 9, and a support frame 5 connected to the bottom of the suspension platform 3 is provided at the edge of the top of the mounting platform 1. A battery pack electrically connected to the drive motor 18 is provided inside the mounting platform 1;

[0037] Several groups of sampling chambers 6 are evenly distributed at the edge of the bottom of the installation platform 1. The number of the sampling chambers 6 is consistent with the number of the transmission mechanism. The top of the sampling chamber 6 is provided with several groups of support slide rods 10 that penetrate to the top of the installation platform 1. The support slide rods 10 are located on the outside of the top of the installation platform 1 and are sleeved with springs A14. The bottom end of the spring A14 fits with the top of the installation platform 1.

[0038] A second water inlet pipe 7 is provided at the input end of the sampling chamber 6, and the second water inlet pipe 7 has an extensible characteristic. The other end of the second water inlet pipe 7 is connected to the first water inlet pipe 2. A water inlet control mechanism is provided inside the first water inlet pipe 2. The water inlet control mechanism includes a spring C32 provided at one end of the first water inlet pipe 2, and a pipe plug 31 is provided at the other end of the spring C32, which fits the inner wall of the first water inlet pipe 2. A first traction rope 22 that runs through the outside of the first water inlet pipe 2 and is wound around the outside of the transmission shaft 19 is provided at the middle part of the pipe plug 31 near one end of the spring C32. The front end of the pipe plug 31 is close to the water inlet port of the first water inlet pipe 2, and the water inlet port of the second water inlet pipe 7 is close to the water inlet port of the second water inlet pipe 7. The inlet end is connected with the output end of the first water inlet pipe 2, and the pipe plug 31 is located between the water inlet port and the output end of the first water inlet pipe 2. The sewage entering the first water inlet pipe 2 is blocked by the pipe plug 31. Two groups of air bags 4 are symmetrically arranged at the positions on both sides of the first water inlet pipe 2 on the top of the installation platform 1. The input end of the air bag 4 is connected with the sampling chamber 6. The input end of the air bag 4 is provided with an air pipe 11 connected with the sampling chamber 6, and a one-way valve 21 is provided at one end of the air pipe 11 close to the sampling chamber 6. The air pipe 11 has an extensible characteristic. The front end of the air bag 4 is provided with an air nozzle, and the air bag 4 can be inflated and deflated through the air nozzle;

[0039] A piston exhaust mechanism is provided inside the sampling chamber 6, and the piston exhaust mechanism is used to squeeze the gas inside the sampling chamber 6 into the inside of the airbag 4. The piston exhaust mechanism includes a piston plate 28 provided inside the sampling chamber 6, and the outer side of the piston plate 28 is in contact with the inner wall of the sampling chamber 6. A plurality of groups of springs B27 are evenly distributed on one end of the back side of the piston plate 28, and the other end of the spring B27 is connected to one end of the back side of the sampling chamber 6. A second traction rope 23 extending to the outside of the sampling chamber 6 and wound around the outer side of the outer sleeve shaft 12 is provided in the middle of the back side of the piston plate 28, and a winding groove 25 adapted to the second traction rope 23 is provided on the outer side of the outer sleeve shaft 12;

[0040] A drain pipe 30 is provided at the output end of the sampling chamber 6, and a drain valve 20 is provided at the output end of the drain pipe 30. A mounting chamber 29 is provided at the top of the drain valve 20, and a piston groove 37 is provided at the top of the mounting chamber 29. The piston groove 37 is communicated with the interior of the sampling chamber 6. A buckle 36 extending to the interior of the sampling chamber 6 is provided inside the piston groove 37, and a spring D35 is provided at the bottom of the buckle 36. The buckle 36 slides up and down inside the piston groove 37 and fits with the inner wall of the piston groove 37. A control valve core 33 connected to the interior of the drain valve 20 with threads is provided at the bottom of the drain valve 20, and a connecting rope 34 is provided at the top of the control valve core 33. The other end of the connecting rope 34 extends to the interior of the piston groove 37 and is connected with the bottom of the buckle 36.

[0041] An outer sleeve shaft 12 is sleeved on the bottom of the outer side of the transmission shaft 19 . The bottom of the outer sleeve shaft 12 penetrates to the bottom of the mounting platform 1 , and the bottom of the outer sleeve shaft 12 is fixedly connected to the bottom of the sampling chamber 6 .

[0042] The use process of the stratified sampling device for wastewater detection proposed in this embodiment is as follows: when sampling wastewater, the suspension platform 3 is connected to an external traction device, so that the device is suspended above the wastewater to be sampled, and then the device is lowered to enter the wastewater;

[0043] When the device enters the sampling depth in the wastewater, the driving motor 18 is started to drive the incomplete gear 8 installed at one end of the driving shaft 16 to rotate. When the incomplete gear 8 is meshed with one set of gears 15, the rotation of the incomplete gear 8 drives the gear 15 to rotate, and the rotation of the gear 15 drives the transmission shaft 19 to rotate.

[0044] The outer sleeve shaft 12 is driven to rotate by the rotation of the transmission shaft 19. At this time, the outer sleeve shaft 12 and the transmission shaft 19 are connected by the meshing between the outer protrusion 24 and the inner groove 26. The first traction rope 22 is rolled up by the rotation of the transmission shaft 19, thereby pulling the pipe plug 31 to move inside the first water inlet pipe 2 and compressing the spring C32 to generate a rebound force. When the pipe plug 31 moves to the output end of the first water inlet pipe 2, the wastewater entering the first water inlet pipe 2 is transported to the inside of the second water inlet pipe 7 through the first water inlet pipe 2 and further enters the inside of the sampling chamber 6.

[0045] As the outer sleeve shaft 12 rotates, the second traction rope 23 is rolled up, thereby pulling the piston plate 28 to move inside the sampling chamber 6. The displacement of the piston plate 28 compresses the spring B27 to generate a rebound force, and at the same time compresses the gas inside the sampling chamber 6 into the inside of the air pipe 11 and transports it to the inside of the airbag 4, thereby realizing the inflation function of the airbag 4. When the airbag 4 is inflated, it will be affected by the buoyancy of the wastewater, thereby providing auxiliary buoyancy for the overall floating of the equipment;

[0046] As the piston plate 28 moves, the amount of wastewater entering the sampling chamber 6 increases continuously. When the piston plate 28 moves to the position of the buckle 36, the bottom of the piston plate 28 squeezes the buckle 36 to shrink, thereby compressing the spring D35, so that the buckle 36 shrinks toward the inside of the piston groove 37. When the piston plate 28 passes the position of the buckle 36, the buckle 36 is driven to reset under the action of the rebound force of the spring D35, thereby forming a blocking and limiting effect on the piston plate 28, preventing the piston plate 28 from being reset by the rebound force of the spring B27;

[0047] At the same time, the interior of the sampling chamber 6 is filled with wastewater, and the overall gravity of the sampling chamber 6 is continuously increased, thereby driving the sampling chamber 6 to move downward relative to the mounting platform 1, and then driving the outer sleeve shaft 12 connected to the connecting plate 13 to move downward through the sampling chamber 6, so that the outer protrusion 24 and the inner groove 26 are released from the meshing state, so that the outer sleeve shaft 12 no longer rotates with the transmission shaft 19, and at this time, with the rotation of the incomplete gear 8, the incomplete gear 8 is also released from the meshing state with the gear 15, and the pipe plug 31 will be displaced and reset inside the first water inlet pipe 2 under the action of the rebound force of the spring C32, thereby blocking the water inlet port of the first water inlet pipe 2, completing the wastewater sampling process at this depth, and the transmission shaft 19 is also subjected to the traction force of the first traction rope 22, driving the gear 15 to rotate in the opposite direction, thereby performing reverse rotation, and at this time the transmission shaft 19 has released the transmission connection with the outer sleeve shaft 12, and thus will not drive the outer sleeve shaft 12 to rotate;

[0048] Further, the depth of the device is adjusted, and the drive motor 18 is started again to drive another set of gears 15 to rotate, thereby repeating the above steps to achieve the stratified sampling function of wastewater at different depths;

[0049] After the sampling is completed, the sampling device is hoisted, and the buoyancy of the airbag 4 provides auxiliary buoyancy for the device, thereby saving the power required for hoisting;

[0050] When the sampled wastewater needs to be taken out, the control valve core 33 is rotated to connect the interior of the drain valve 20, thereby discharging the wastewater inside the sampling chamber 6 through the drain pipe 30. As the control valve core 33 rotates, the connecting rope 34 pulls the buckle 36 to move downward, thereby releasing the blocking limit on the piston plate 28, so that the piston plate 28 pushes the wastewater inside the sampling chamber 6 to be discharged from the position of the drain pipe 30 under the action of the rebound force of the spring B27, providing driving force for the discharge of the wastewater and realizing the resetting of the structure.

[0051] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A stratified sampling device for wastewater detection, characterized in that: The invention comprises a mounting platform (1), wherein a support plate (17) is arranged in the middle of the top of the mounting platform (1), a drive motor (18) is arranged on the top of the support plate (17), and the drive motor (18) passes through the upper and lower ends of the support plate (17), and a plurality of transmission mechanisms are evenly distributed at positions around the outer side of the support plate (17) on the top of the mounting platform (1), and the transmission mechanism comprises a transmission shaft (19) evenly distributed on the top of the mounting platform (1), and the bottom end of the transmission shaft (19) extends to the inside of the mounting platform (1), and a bearing seat is arranged between the outer side of the transmission shaft (19) and the support plate (17); A plurality of groups of sampling chambers (6) are evenly distributed at the edge of the bottom of the mounting platform (1), the number of the sampling chambers (6) being consistent with the number of the transmission mechanisms, a plurality of groups of support slide rods (10) penetrating to the top of the mounting platform (1) are arranged at the top of the sampling chambers (6), a spring A (14) is sleeved on the outer side of the support slide rods (10) located at the top of the mounting platform (1), and the bottom end of the spring A (14) is in contact with the top of the mounting platform (1); The input end of the sampling chamber (6) is provided with a second water inlet pipe (7), and the second water inlet pipe (7) has an extensible characteristic, the other end of the second water inlet pipe (7) is connected to the first water inlet pipe (2), and a water inlet control mechanism is provided inside the first water inlet pipe (2), and two groups of air bags (4) are symmetrically provided at positions on both sides of the first water inlet pipe (2) on the top of the installation platform (1), and the input end of the air bag (4) is connected to the sampling chamber (6); A piston exhaust mechanism is provided inside the sampling chamber (6), and the piston exhaust mechanism is used to squeeze the gas inside the sampling chamber (6) into the interior of the airbag (4); a drain pipe (30) is provided at the output end of the sampling chamber (6), and a drain valve (20) is provided at the output end of the drain pipe (30); A piston plate (28) is arranged inside the sampling chamber (6), and the wastewater squeezing force applied to the piston plate (28) during the sampling process causes the gas inside the sampling chamber (6) to be squeezed into the airbag (4), thereby inflating the airbag (4), and the airbag (4) is then subjected to the buoyancy of the wastewater, thereby providing buoyancy for the sampling device and assisting the sampling device in moving upward; An outer sleeve shaft (12) is sleeved on the bottom of the outer side of the transmission shaft (19), the bottom of the outer sleeve shaft (12) penetrates the bottom of the mounting platform (1), and the bottom of the outer sleeve shaft (12) is fixedly connected to the bottom of the sampling chamber (6).

2. A stratified sampling device for wastewater detection according to claim 1, characterized in that: The transmission mechanism further comprises a driving shaft (16) arranged at the output end of the driving motor (18), an incomplete gear (8) being arranged on the outer side of the driving shaft (16), a gear (15) being arranged on the top end of the transmission shaft (19) and being adapted to the incomplete gear (8), external protrusions (24) being evenly distributed on the bottom of the outer side of the transmission shaft (19), and internal grooves (26) being evenly distributed on the top of the inner wall of the outer sleeve shaft (12) and being adapted to the external protrusions (24).

3. A stratified sampling device for wastewater detection according to claim 2, characterized in that: A displacement through hole compatible with the transmission shaft (19) and the outer sleeve shaft (12) is provided inside the mounting platform (1); the transmission shaft (19) rotates inside the displacement through hole; the outer sleeve shaft (12) moves up and down inside the displacement through hole; and the outer sleeve shaft (12) slides up and down outside the transmission shaft (19); a connecting plate (13) is provided between the bottom of the outer sleeve shaft (12) and the sampling chamber (6); when the sampling chamber (6) moves, the outer sleeve shaft (12) is driven to follow the displacement through the connecting plate (13).

4. A stratified sampling device for wastewater detection according to claim 1, characterized in that: The water inlet control mechanism comprises a spring C (32) arranged at one end inside the first water inlet pipe (2); the other end of the spring C (32) is provided with a pipe plug (31) which fits the inner wall of the first water inlet pipe (2); and the middle part of the pipe plug (31) close to one end of the spring C (32) is provided with a first traction rope (22) which penetrates to the outside of the first water inlet pipe (2) and is wound around the outside of the transmission shaft (19).

5. A stratified sampling device for wastewater detection according to claim 4, characterized in that: The front end of the pipe plug (31) is close to the water inlet port of the first water inlet pipe (2), the input end of the second water inlet pipe (7) is connected to the output end of the first water inlet pipe (2), and the pipe plug (31) is located between the water inlet port and the output end of the first water inlet pipe (2), so that sewage entering the first water inlet pipe (2) is blocked by the pipe plug (31).

6. A stratified sampling device for wastewater detection according to claim 1, characterized in that: The input end of the airbag (4) is provided with an air pipe (11) which is in communication with the sampling chamber (6), and a one-way valve (21) is provided at one end of the air pipe (11) close to the sampling chamber (6); the air pipe (11) has an extensible property, and the front end of the airbag (4) is provided with an air nozzle, through which the airbag (4) can be inflated and deflated.

7. A stratified sampling device for wastewater detection according to claim 1, characterized in that: The piston exhaust mechanism comprises a piston plate (28) arranged inside the sampling chamber (6), the outer side of the piston plate (28) being in contact with the inner wall of the sampling chamber (6), a plurality of groups of springs B (27) being evenly distributed on one end of the back side of the piston plate (28), and the other end of the spring B (27) being connected to one end of the back side of the sampling chamber (6), a second traction rope (23) extending to the outside of the sampling chamber (6) and wound around the outside of the outer sleeve shaft (12) being arranged in the middle of the back side of the piston plate (28), and a winding groove (25) matching the second traction rope (23) being arranged on the outside of the outer sleeve shaft (12).

8. A stratified sampling device for wastewater detection according to claim 1, characterized in that: The top of the drain valve (20) is provided with a mounting chamber (29), the top of the mounting chamber (29) is provided with a piston groove (37), and the piston groove (37) is communicated with the interior of the sampling chamber (6), the interior of the piston groove (37) is provided with a buckle (36) extending into the interior of the sampling chamber (6), and the bottom of the buckle (36) is provided with a spring D (35), and the buckle (36) slides up and down inside the piston groove (37) and fits with the inner wall of the piston groove (37).

9. A stratified sampling device for wastewater detection according to claim 8, characterized in that: A control valve core (33) is provided at the bottom of the drain valve (20) and is connected to the inner thread of the drain valve (20), and a connecting rope (34) is provided at the top of the control valve core (33), the other end of the connecting rope (34) extending to the inside of the piston groove (37) and connected to the bottom of the buckle (36).

10. A stratified sampling device for wastewater detection according to claim 2, characterized in that: A protective cover (9) is provided at the top of the mounting platform (1) at a position outside the gear (15), the protective cover (9) covers the gear (15) and the incomplete gear (8) on its inner side, a suspension platform (3) is provided at the top of the protective cover (9), and a support frame (5) connected to the bottom of the suspension platform (3) is provided at an edge position of the top of the mounting platform (1), and a battery pack electrically connected to the drive motor (18) is provided inside the mounting platform (1).

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