Manual sampling detection device special for large drainage pipe culvert

Abstract

The invention belongs to the technical field of environmental monitoring, and particularly relates to a special manual sampling detection device for a large drainage pipe culvert, which comprises a three-way hose, one end of the three-way hose is communicated with a manual injector, and the other two ends of the three-way hose are respectively communicated with a first one-way valve and a second one-way valve; the end, away from the manual injector, of the first one-way valve communicates with a PVC thickened transparent hose. The relative position of the front end of the sampling water inlet pipe and the liquid level is observed by means of the pipeline endoscope, the front end of the sampling water inlet pipe accurately extends into the liquid level, then the manual injector is repeatedly pushed and pulled, air in the sampling water inlet pipe is exhausted, a negative pressure environment is formed, and at the moment, sewage in the drainage pipe culvert flows into the three-way hose through the second one-way valve under the action of atmospheric pressure; and then the gas enters the PVC thickened transparent hose through the first one-way valve and finally enters the sampling detection bottle.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of environmental monitoring, and particularly relates to a manual sampling detection device specially used for large drainage pipe culverts. BACKGROUND

[0002] In the current urban drainage system, the large drainage pipe culverts are usually buried 7-10 meters below the road, have a fast flow speed (>1 m / s) and a deep liquid level, and only communicate with the outside through the small air holes with a diameter not greater than 2 cm on the inspection well, which causes the following technical problems: Electric equipment cannot be used: since the drainage pipe culverts are located in the middle of the green belt or below the driving lane, there is no power supply on the site, and the electric water pump cannot be used; and the suction distance of the self-priming pump is generally only 3-5 meters, and the water 10 meters deep underground cannot be pumped up; There is a great safety hazard: in order to avoid traffic and personnel safety problems, the inspection well cover cannot be opened for sampling, and therefore the sampling can only be performed through the small holes for air communication with the outside on the inspection well cover; The liquid level is not visible: the light in the drainage pipe culvert is extremely poor, and the liquid level cannot be directly observed, which leads to sampling failure, and therefore, there is an urgent need for a device which can safely and accurately complete sampling through the small-diameter hole under the conditions of no electricity, deep burial, fast flow speed and invisible liquid level. SUMMARY

[0003] In order to make up for the deficiencies of the prior art and solve at least one technical problem in the background art.

[0004] The technical scheme adopted by the application to solve the technical problem is that the manual sampling detection device specially used for the large drainage pipe culvert comprises a three-way hose; one end of the three-way hose is communicated with a manual syringe (50-200 ml), and the other two ends of the three-way hose are respectively communicated with a first one-way valve and a second one-way valve; one end of the first one-way valve away from the manual syringe is communicated with a PVC thickened transparent hose (an outer diameter of 6-10 mm), one end of the PVC thickened transparent hose away from the first one-way valve is communicated with a sampling detection bottle, and the sampling detection bottle is communicated with an atmospheric communication pipe (used for exhaust when water is sampled) inside; one end of the second one-way valve away from the first one-way valve is communicated with a sampling water inlet pipe, a pipeline endoscope (a diameter of 8 mm) is fixedly installed on the side wall of the sampling water inlet pipe close to the water inlet end, the pipeline endoscope is electrically connected with a display through a wire, and a group of fixing rings are fixedly connected to the side wall of the sampling water inlet pipe.

[0005] The manual pressure relief valve is arranged at the position close to the second one-way valve of the sampling water inlet pipe, a counterweight pipe (with a diameter less than 20 mm) is communicated with the end of the pipe endoscope, and the counterweight pipe is made of corrosion-resistant metal material, so that the counterweight pipe is not corroded by sewage in long-term use.

[0006] The front end of the counterweight pipe is provided with a filter, the filter comprises a shell and a filter screen, the shell is fixedly connected with the side wall of the counterweight pipe, and the filter screen is arranged in the shell.

[0007] The sampling water inlet pipe is arranged in multiple sections, the sampling water inlet pipes are connected through pipe extension connectors, the pipe endoscope is fixedly installed on the tail end sampling water inlet pipe, and the top end sampling water inlet pipe is communicated with the second one-way valve.

[0008] The inner wall of the shell is fixedly connected with a connecting plate, the bottom surface of the connecting plate is provided with a rotating connecting shaft, the side wall of the connecting shaft is fixedly connected with a rectangular plate, the bottom surface of the rectangular plate is fixedly connected with a group of bristles, the bristles are used for cleaning the filter screen, and the outer side wall of the connecting shaft is fixedly connected with a group of driving leaves.

[0009] The bottom surface of the connecting plate is rotatably connected with a circular shaft, the bottom end of the circular shaft is open, the inner wall of the connecting shaft and the circular shaft is sealingly and slidably connected, the rectangular plate is a hollow structure, the side wall of the connecting shaft is provided with a connecting groove in communication with the inside of the rectangular plate, and the bottom surface of the rectangular plate is provided with a group of circular holes.

[0010] The inner wall of the shell is fixedly connected with a circular ring, the top surface of the circular ring is fixedly connected with a group of first springs, one end of the first spring away from the circular ring is fixedly connected with a connecting ring, the filter screen is fixedly connected to the inner wall of the connecting ring, the bottom surface of the filter screen is fixedly connected with a group of magnetic sheets, the rectangular plate is made of magnetic material, and the rectangular plate and the magnetic sheet are magnetically attracted.

[0011] The inside of the connecting ring is a hollow structure, a group of annularly distributed through grooves are formed in the inner wall of the connecting ring, and a pushing assembly for pushing water is arranged in the connecting ring.

[0012] The pushing assembly comprises a pushing ring slidably connected with the inner wall of the connecting ring, a group of second springs are fixedly connected between the bottom surface of the pushing ring and the inner wall of the connecting ring, a pair of connecting rods are slidably connected to the top surface of the connecting ring, and the bottom surface of the connecting rod is fixedly connected with the pushing ring.

[0013] The beneficial effects of the present application are as follows: 1. The present application will be put into the sewer culvert inside the sampling inlet pipe to the depth of 10 meters underground, in this process, the relative position of the sampling inlet pipe front end and the liquid level is observed by means of the pipeline endoscope, so that the sampling inlet pipe front end is accurately inserted into the liquid surface, then the hand injector is repeatedly pushed and pulled, the air in the sampling inlet pipe is discharged to form a negative pressure environment, at this time, under the action of atmospheric pressure, the sewage in the sewer culvert flows into the three-way hose through the second one-way valve, then enters the PVC thickened transparent hose through the first one-way valve, and finally enters the sampling detection bottle, so that under the complex conditions of no electricity, deep burial, fast flow and invisible liquid level, the sampling work of the sewage in the large sewer culvert is safely and accurately completed through the small diameter air hole on the inspection well cover.

[0014] 2. When the sewage is sampled, the sewage will pass through the shell, at this time, the water flow will drive the driving blade to rotate, so that the driving blade drives the connecting shaft to rotate, so that the rectangular plate rotates, at this time, the bristles rotate with the rectangular plate, so that the bristles clean the filter screen, so that the filter screen can be continuously cleaned. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in conjunction with the drawings.

[0016] Figure 1 is the structure diagram of the sampling detection device in the present application; Figure 2 is the structure diagram of the shell in the present application; Figure 3 is the internal structure diagram of the shell in the present application; Figure 4 is the A enlarged view of Figure 3 ; Figure 5 is the B enlarged view of Figure 3 .

[0017] In the drawing: 1, sampling detection bottle; 2, atmospheric communication pipe; 3, first one-way valve; 4, second one-way valve; 5, injector; 6, hand pressure relief valve; 7, pipeline extension connector; 8, fixing ring; 9, counterweight pipe; 10, pipeline endoscope; 11, filter; 12, PVC thickened transparent hose; 13, sampling inlet pipe; 14, display; 15, three-way hose; 16, shell; 17, filter screen; 18, connecting plate; 19, connecting shaft; 20, driving blade; 21, rectangular plate; 22, bristles; 23, circular shaft; 24, connecting groove; 25, circular hole; 26, connecting ring; 27, magnetic sheet; 28, circular ring; 29, push ring; 30, through groove; 31, connecting rod. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] Example 1: Figure 1 As shown, a manual sampling and testing device specifically for large drainage culverts according to an embodiment of the present invention includes a three-way hose 15; one end of the three-way hose 15 is connected to a manual syringe 5 (50-200 ml), and the other two ends of the three-way hose 15 are respectively connected to a first one-way valve 3 and a second one-way valve 4; the end of the first one-way valve 3 away from the manual syringe 5 is connected to a PVC thickened transparent hose 12 (outer diameter 6-10 mm), and the end of the PVC thickened transparent hose 12 away from the first one-way valve 3 is connected to a sampling and testing bottle 1, and the sampling and testing bottle 1 is connected to an atmosphere connecting pipe 2 (for exhaust when taking water samples); the end of the second one-way valve 4 away from the first one-way valve 3 is connected to a sampling water inlet pipe 13, and a pipeline endoscope 10 (diameter 8 mm) is fixedly installed on the side wall of the sampling water inlet pipe 13 near the water inlet end. The pipeline endoscope 10 is electrically connected to a display 14 through a wire. A set of fixing rings 8 are fixedly connected to the side wall of the sampling water inlet pipe 13, and the fixing rings 8 are used to connect the wires; The first one-way valve 3 and the second one-way valve 4 are one-way check valves with low opening pressure to ensure that the liquid can flow in one direction even under low pressure conditions. The atmospheric connecting pipe 2 is used to discharge the gas in the sampling and detection bottle 1 when taking water samples. The operator first passes through the air vent on the inspection well cover, and then slowly lowers the sampling water inlet pipe 13 from the air vent of the well cover to the inside of the drainage culvert at a depth of 10 meters underground. In this process, the relative position of the front end of the sampling water inlet pipe 13 and the liquid level is observed with the help of a pipeline endoscope 10, and the lowering position and depth of the sampling water inlet pipe 13 are adjusted so that the front end of the sampling water inlet pipe 13 accurately extends into the liquid surface. When the position of the water inlet pipe is adjusted, the sampling operation is started, and the manual syringe 5 is repeatedly pushed and pulled to first discharge the air in the sampling water inlet pipe 13 to form a negative pressure environment. At this time, under the action of atmospheric pressure, the sewage in the drainage culvert flows into the three-way hose 15 through the second one-way valve 4. Then it passes through the first one-way valve 3 into the PVC thickened transparent hose 12, and finally enters the sampling detection bottle 1. Due to the one-way check characteristics of the first one-way valve 3 and the second one-way valve 4, the sewage can only flow from the drainage culvert to the detection bottle, and there will be no backflow. Through the above specific implementation methods, the manual sampling device of the present invention can safely and accurately complete the sampling of sewage in large drainage culverts through the small diameter air vents on the manhole cover under complex conditions such as no electricity, deep burial, fast flow rate and invisible liquid level.

[0020] The sampling inlet pipe 13 is provided with a manual pressure relief valve 6 near the second one-way valve 4, and the sampling inlet pipe 13 is communicated with a counterweight pipe 9 (diameter less than 20mm) near one end of the pipe endoscope 10, the counterweight pipe 9 is made of corrosion-resistant metal material, to ensure that it is not corroded by sewage for a long time; if multiple sampling is needed, open the manual pressure relief valve 6 to drain the sewage in the inlet pipe after each sampling is completed, to prevent the residual sewage from being contaminated by mixing with the next sample, after draining the sewage, close the manual pressure relief valve 6, and operate the push-pull manual syringe 5 again to complete the next sampling, the counterweight pipe 9 is installed at the front end of the sampling inlet pipe 13, to ensure that the sampling inlet pipe 13 can smoothly pass through the inspection well air hole and sink to the bottom of the pipe culvert.

[0021] The front end of the counterweight pipe 9 is provided with a filter 11, the filter 11 includes a shell 16 and a filter screen 17, the shell 16 is fixedly connected with the side wall of the counterweight pipe 9, and the filter screen 17 is arranged in the shell 16, and the diameter of the shell 16 is less than 20mm; when the sampling inlet pipe 13 in the application is used for water inlet, water will pass through the filter screen 17 in the filter 11, so that the impurities in the water are blocked by the filter screen 17, to prevent the impurities in the sewage of the drain pipe culvert from entering the sampling inlet pipe 13, causing the pipe of the sampling inlet pipe 13 to be blocked.

[0022] The sampling inlet pipe 13 is provided in multiple sections, and each section of the sampling inlet pipe 13 is connected through a pipe extension connector 7, the pipe endoscope 10 is fixedly installed on the tail end sampling inlet pipe 13, and the top end sampling inlet pipe 13 is communicated with the second one-way valve 4; the sampling inlet pipe 13 is designed in multiple sections in the application, the appropriate number of sections can be selected according to the large drain pipe culvert of different depths, and the pipe extension connector 7 is used for connection, so that the device can be used for large drain pipe culverts of different depths.

[0023] Embodiment two: as Figures 1 to 5As shown, the comparative example one, wherein another embodiment of the application is: the inner wall of the shell 16 is fixedly connected with the connecting plate 18, the bottom surface of the connecting plate 18 is provided with a rotating connecting shaft 19, the side wall of the connecting shaft 19 is fixedly connected with a rectangular plate 21, the bottom surface of the rectangular plate 21 is fixedly connected with a group of bristles 22, the bristles 22 are used for cleaning the filter screen 17, the outer side wall of the connecting shaft 19 is fixedly connected with a group of driving leaves 20; Because sewage is sampled, sewage will pass through the filter screen 17, impurities will accumulate on the filter screen 17 after a long time of use, thereby causing the filter screen 17 to be blocked, and further affecting the sampling of the sewage, through the above mechanism, when the sewage is sampled, the water flow will drive the driving leaves 20 to rotate, so that the driving leaves 20 drive the connecting shaft 19 to rotate, so that the rectangular plate 21 rotates, at this time the bristles 22 will rotate with the rectangular plate 21, so that the bristles 22 clean the filter screen 17, so that the filter screen 17 can be continuously cleaned.

[0024] The bottom surface of the connecting plate 18 is rotatably connected with a circular shaft 23, the bottom end of the circular shaft 23 is open, the inner wall of the connecting shaft 19 and the circular shaft 23 is sealingly and slidably connected, the rectangular plate 21 is a hollow structure, the side wall of the connecting shaft 19 is provided with a connecting groove 24 in communication with the inside of the rectangular plate 21, and the bottom surface of the rectangular plate 21 is provided with a group of circular holes 25; When sampling, the hand-held syringe 5 needs to be repeatedly pushed and pulled, at this time the shell 16 will intermittently enter liquid, when the liquid enters, the fan blades will be pushed by the water flow, so that the fan blades drive the connecting shaft 19 to slide towards the side close to the circular shaft 23, because the circular holes 25 are open, the circular shaft 23 will be filled with water, at this time the water will be pushed into the rectangular plate 21 from the connecting groove 24 when the connecting shaft 19 slides, and then sprayed out of the circular holes 25 to the bristles 22, so as to re-clean the bristles 22, when the shell 16 stops entering liquid, the connecting shaft 19 will slide downward due to gravity to reset.

[0025] The inner wall of the shell 16 is fixedly connected with a circular ring 28, the top surface of the circular ring 28 is fixedly connected with a group of first springs, one end of the first spring away from the circular ring 28 is fixedly connected with a connecting ring 26, the filter screen 17 is fixed on the inner wall of the connecting ring 26, the bottom surface of the filter screen 17 is fixedly connected with a group of magnetic sheets 27, the rectangular plate 21 is made of magnetic material, and the rectangular plate 21 and the magnetic sheet 27 are magnetically attracted; The connecting shaft 19 in the application rotates, and the rectangular plate 21 rotates synchronously. At this time, the rectangular plate 21 passes the magnetic sheet 27. When the magnetic sheet 27 is attracted, it drives the filter screen 17 to move upward, thereby driving the connecting ring 26 to move upward. At this time, the filter screen 17 is more attached to the bristles 22, thereby improving the cleaning effect of the bristles 22 on the filter screen 17. When the rectangular plate 21 passes the magnetic sheet 27, the first spring drives the connecting ring 26 to move downward. At the same time, the first spring can drive the connecting ring 26 to shake due to the elasticity, thereby making the filter screen 17 shake to shake off the impurities of the filter screen 17, thereby further improving the cleaning effect on the filter screen 17.

[0026] The connecting ring 26 is a hollow structure. The inner wall of the connecting ring 26 is provided with a group of annularly distributed through grooves 30. The connecting ring 26 is provided with a water pushing assembly. When the water is sampled, the water enters the connecting ring 26 from the through grooves 30. At this time, the water in the connecting ring 26 can be pushed by the pushing assembly, so that the water is sprayed from the through grooves 30 to the bottom surface of the filter screen 17, thereby further cleaning the filter screen 17.

[0027] The pushing assembly comprises a pushing ring 29 which is in sliding connection with the inner wall of the connecting ring 26. A group of second springs are fixedly connected between the bottom surface of the pushing ring 29 and the inner wall of the connecting ring 26. A pair of connecting rods 31 are in sliding connection with the top surface of the connecting ring 26. The bottom surface of the connecting rod 31 is fixedly connected with the pushing ring 29. When the connecting ring 26 moves upward, the connecting rod 31 is pushed by the connecting plate 18. At this time, the connecting rod 31 pushes the pushing ring 29, so that the pushing ring 29 pushes the water in the connecting ring 26, thereby spraying the water from the through grooves 30 to the bottom surface of the filter screen 17, thereby cleaning the filter screen 17.

[0028] Working principle: the operator first checks the air hole on the manhole cover, then slowly lowers the sampling inlet pipe 13 from the air hole of the manhole cover into the inside of the drainage pipe culvert at a depth of 10 meters underground, in the process, the relative position of the front end of the sampling inlet pipe 13 and the liquid level is observed by means of the pipe endoscope 10, the lowering position and depth of the sampling inlet pipe 13 are adjusted, so that the front end of the sampling inlet pipe 13 accurately extends into the liquid surface, when the inlet pipe position is adjusted, the sampling operation is started, the manual syringe 5 is repeatedly pushed and pulled, the air in the sampling inlet pipe 13 is discharged, a negative pressure environment is formed, at this time, under the action of atmospheric pressure, the sewage in the drainage pipe culvert flows into the three-way hose 15 through the second check valve 4, then enters the PVC thickened transparent hose 12 through the first check valve 3, and finally enters the sampling detection bottle 1, due to the one-way check valve characteristics of the first check valve 3 and the second check valve 4, the sewage can only flow from the drainage pipe culvert to the detection bottle, and the backflow phenomenon does not occur, through the above specific implementation, the manual sampling device can safely and accurately complete the sampling work of the sewage in the large drainage pipe culvert under the complex conditions of no electricity, deep burial, fast flow and invisible liquid level through the small-diameter air hole on the manhole cover. At the same time, when the sewage is sampled, the sewage will pass through the filter screen 17, and impurities will accumulate on the filter screen 17 after a long time of use, thereby causing the filter screen 17 to be blocked, and further affecting the sampling of the sewage. When the above mechanism is used to sample the sewage, the sewage will pass through the shell 16, at which time the water flow will drive the driving blades 20 to rotate, thereby causing the driving blades 20 to drive the connecting shaft 19 to rotate, so that the rectangular plate 21 rotates, at which time the bristles 22 rotate with the rectangular plate 21, thereby causing the bristles 22 to clean the filter screen 17, so that the filter screen 17 can be continuously cleaned.

[0029] The above front, rear, left, right, up, down are based on the drawings of the specification Figure 1 As a standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0031] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A manual sampling and detection device specifically for large drainage culverts, comprising a three-way hose (15); characterized in that: One end of the three-way hose (15) is connected to a manual syringe (5), and the other two ends of the three-way hose (15) are respectively connected to a first one-way valve (3) and a second one-way valve (4); One end of the first one-way valve (3) away from the manual syringe (5) is connected to a PVC thick transparent hose (12), and one end of the PVC thick transparent hose (12) away from the first one-way valve (3) is connected to a sampling and detection bottle (1), and the sampling and detection bottle (1) is connected to an atmosphere connecting pipe (2); One end of the second one-way valve (4) away from the first one-way valve (3) is connected to a sampling water inlet pipe (13), and a pipeline endoscope (10) is fixedly installed on the side wall of the sampling water inlet pipe (13) near the water inlet end. The pipeline endoscope (10) has a display (14) electrically connected to the side wall of the sampling water inlet pipe (13), and a group of fixing rings (8) are fixedly connected to the side wall of the sampling water inlet pipe (13), and the fixing rings (8) are connected by wires.

2. A manual sampling and testing device specifically for large drainage culverts according to claim 1, characterized in that: A manual pressure relief valve (6) is provided on the sampling water inlet pipe (13) near the second one-way valve (4). One end of the sampling water inlet pipe (13) near the pipeline endoscope (10) is connected to a counterweight pipe (9), and the counterweight pipe (9) is made of a corrosion-resistant metal material.

3. A manual sampling and testing device specifically for large drainage culverts according to claim 2, characterized in that: A filter (11) is provided at the front end of the counterweight tube (9), and the filter (11) comprises a shell (16) and a filter screen (17). The shell (16) is fixedly connected to the side wall of the counterweight tube (9), and the filter screen (17) is provided in the shell (16). The diameter of the shell (16) is less than 20 mm.

4. The manual sampling and testing device specifically for large drainage culverts according to claim 1 is characterized by: The sampling water inlet pipe (13) is provided with multiple sections, and each section of the sampling water inlet pipe (13) is connected by a pipe extension connector (7). The pipeline endoscope (10) is fixedly mounted on the sampling water inlet pipe (13) at the rear end, and the sampling water inlet pipe (13) at the top end is connected to the second one-way valve (4).

5. The manual sampling and testing device specifically for large drainage culverts according to claim 3 is characterized by: The inner wall of the housing (16) is fixedly connected to a connecting plate (18), the bottom surface of the connecting plate (18) is provided with a rotatable connecting shaft (19), the side wall of the connecting shaft (19) is fixedly connected to a rectangular plate (21), the bottom surface of the rectangular plate (21) is fixedly connected to a group of bristles (22), the bristles (22) are used to clean the filter screen (17), and the outer side wall of the connecting shaft (19) is fixedly connected to a group of driving blades (20).

6. A manual sampling and testing device specifically for large drainage culverts according to claim 5, characterized in that: The bottom surface of the connecting plate (18) is rotatably connected to a circular shaft (23), the bottom end of the circular shaft (23) is open, the connecting shaft (19) is sealingly and slidingly connected to the inner wall of the circular shaft (23), the interior of the rectangular plate (21) is a hollow structure, the side wall of the connecting shaft (19) is provided with a connecting groove (24) communicating with the interior of the rectangular plate (21), and the bottom surface of the rectangular plate (21) is provided with a group of circular holes (25).

7. A manual sampling and testing device specifically for large drainage culverts according to claim 6, characterized in that: The inner wall of the housing (16) is fixedly connected to a circular ring (28), the top surface of the circular ring (28) is fixedly connected to a group of first springs, the end of the first spring away from the circular ring (28) is fixedly connected to a connecting ring (26), the filter screen (17) is fixed on the inner wall of the connecting ring (26), the bottom surface of the filter screen (17) is fixedly connected to a group of magnetic sheets (27), the rectangular plate (21) is made of magnetic material, and the rectangular plate (21) and the magnetic sheets (27) are magnetically attracted to each other.

8. The manual sampling and testing device specifically for large drainage culverts according to claim 7, characterized in that: The interior of the connecting ring (26) is a hollow structure, and a group of annular evenly distributed through grooves (30) are opened on the inner wall of the connecting ring (26). A pushing component for pushing water is provided in the connecting ring (26).

9. The manual sampling and testing device specifically for large drainage culverts according to claim 8, characterized in that: The pushing assembly includes a push ring (29) slidably connected to the inner wall of the connecting ring (26), a group of second springs are fixedly connected between the bottom surface of the push ring (29) and the inner wall of the connecting ring (26), and a pair of connecting rods (31) are slidably connected to the top surface of the connecting ring (26), and the bottom surface of the connecting rods (31) is fixedly connected to the push ring (29).

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