Water quality sampling device for hydraulic engineering

Abstract

The invention provides a water quality sampling device for hydraulic engineering, and relates to the technical field of water quality sampling, the water quality sampling device comprises a test tube mounting rack, a guide frame is fixedly arranged outside the test tube mounting rack, and a front dovetail groove is fixedly arranged at the front end of the guide frame; vertical frames extending upwards are integrally arranged on the rear sides of the tops of the guide frames, and a rear dovetail groove is fixedly formed between the vertical frames of the guide frames on the two sides. A sliding block is arranged at the middle lower part of the rear side of the connecting frame and is connected with the front dovetail groove in a sliding manner; the device is provided with the test tube seat, sampling test tubes can be placed on the test tube seat, the sampling test tubes are fixed in cooperation with the sliding buckle cylinder and the butt-joint tube, a channel is formed during fixing, a complete sampling structure is formed, the sliding buckle cylinder is lifted upwards, the protruding frame is pulled forwards, the sliding buckle cylinder is separated from the sealing cover, and the butt-joint tube is separated from the check valve; switching can be carried out by directly moving the sliding buckle barrel and the butt joint pipe, the switching mode is simple, convenient and stable, and the problem that an existing sampling device lacks a sealed sampling function is solved.

Description

Technical Field

[0001] The invention relates to the technical field of water quality sampling, in particular to a water quality sampling device for water conservancy projects. Background Art

[0002] Before water conservancy construction, it is necessary to take samples of the water body to analyze the specific construction process. By analyzing the substance content in the water, the hardness of the bottom of the water and the soil composition, as well as whether the bottom of the water is solid, can be determined. Test tubes are generally used to store water samples, and water is extracted at a fixed depth for storage and analysis.

[0003] The sampling devices currently used have the following disadvantages:

[0004] 1. The existing sampling device needs to use a water pump to collect water and input it into a test tube. The test tube and the delivery tube need to be held manually. The stability is poor and it is easy to spill. There is a lack of a sealed sampling function that is easy to switch.

[0005] 2. Lack of easy-to-operate active extraction function, which makes it inconvenient to quickly and manually extract water samples and store them;

[0006] 3. Lack of automatic quantification function makes it inconvenient to limit the total amount of water samples extracted. Summary of the invention

[0007] In view of this, the present invention aims at the deficiencies in the above-mentioned prior art and provides a water quality sampling device for water conservancy projects.

[0008] The present invention provides a water quality sampling device for a water conservancy project, specifically comprising: a test tube mounting frame, a guide frame is fixedly arranged on the outside of the test tube mounting frame, the front side of the guide frame is turned downward, and a front dovetail groove is fixedly arranged at the front end of the guide frame; a vertical frame extending upward is integrally arranged on the top rear side of the guide frame, and a rear dovetail groove is fixedly arranged between the vertical frames of the guide frames on both sides; a connecting frame, a sliding block is arranged in the middle and lower part of the rear side of the connecting frame and is slidably connected with the front dovetail groove; an upper guide cylinder is integrally arranged on the top of the connecting frame, and an air outlet bin is integrally arranged at the rear end of the upper guide cylinder; a middle sliding block of the upper guide cylinder A sliding buckle cylinder is movably provided, and limiting flanges are fixedly provided on the upper and lower sides of the outside of the sliding buckle cylinder; an exhaust hole is opened on the rear side of the sliding buckle cylinder, and the exhaust hole can be aligned with the air outlet bin; a round frame structure is integrally provided at the bottom of the connecting frame, and a docking tube is slidably provided in the round frame structure, and a closing valve is fixedly connected to the front end of the docking tube, and a steel wire hose is provided on the front side of the closing valve to connect a sampling hand tube, and the sampling hand tube is consistent with the steel wire hose at this location The length; test tube seats are fixedly provided equidistantly inside the test tube mounting frame, and sampling test tubes are provided in the test tube seats; check valves are connected to the lower front sides of the sampling test tubes.

[0009] Optionally, a support plate is fixedly provided at the bottom rear side of the test tube mounting rack, and a piston rack is fixedly provided at the top rear side of the support plate; a vacuum piston is fixedly provided at the upper inner part of the piston rack; two groups of one-way valves arranged vertically are fixedly provided at the lower front side of the piston rack, and an air path is provided to connect the bottom end of the vacuum piston to the two groups of one-way valves; a pipeline is provided at the front end of the lower one-way valve to the rear end of the air outlet bin.

[0010] Optionally, a sliding block is provided at the bottom of the air outlet bin and is slidably connected to the rear dovetail groove; an anti-rotation flange is integrally provided on the front side of the sliding buckle cylinder, and the anti-rotation flange is slidably connected to the upper guide cylinder; a spring is sleeved on the outside of the sliding buckle cylinder at a position below the upper guide cylinder; a pull ring is integrally provided on the top of the sliding buckle cylinder; and the middle of the connecting frame is an arc-shaped structure.

[0011] Optionally, a protruding frame is fixedly provided on the external front side of the docking tube, a guide rod is fixedly provided on the upper rear side of the protruding frame, and the protruding frame is slidably connected to the connecting frame; a spring is sleeved on the outside of the docking tube at a position behind the connecting frame; and a pull ring is integrally provided on the front side of the protruding frame.

[0012] Optionally, a scale for detecting depth is provided on the outside of the sampling hand tube; a filter screen is fixedly provided at the bottom tube opening of the sampling hand tube, and the mesh of the filter screen is smaller than the inner diameter of the sampling hand tube.

[0013] Optionally, a threaded outer ring is fixedly provided on the upper part of the outside of the sampling test tube; the main body of the test tube holder is a U-shaped structure, a circular groove is provided at the upper opening of the test tube holder, and a flange matching the circular groove is provided at the bottom of the threaded outer ring; the two sides of the check valve can be matched and clamped in the test tube holder; the rear end of the butt tube can be fitted on the front end of the check valve, and a rubber sealing ring is fixedly provided on the rear end of the butt tube.

[0014] Optionally, a sealing cover is fixedly provided on the outside of the threaded outer ring via a threaded connection, a vent hole is opened on the top of the sealing cover, an annular flange is integrally provided above the sealing cover, and a sliding buckle tube can be fitted and buckled on the outside of the annular flange.

[0015] Optionally, an air-locking valve plate is provided in the sealing cover, and a downward-inclined outer slide is integrally provided on the outside of the air-locking valve plate. The outer slide is annular and slides within the sealing cover in a limited position; a buoyancy block is fixedly provided at the bottom of the air-locking valve plate.

[0016] Optionally, the interior of the sampling test tube is filled with cylindrical test tube filter cotton.

[0017] The beneficial effects are as follows:

[0018] 1. The present invention is provided with a test tube seat, which can place the sampling test tube, and cooperates with the sliding buckle cylinder and the docking tube to fix the sampling test tube. When fixed, it also forms a passage to form a complete sampling structure. The sliding buckle cylinder is lifted upward, and the protruding frame is pulled forward to separate the sliding buckle cylinder from the sealing cover and the docking tube from the check valve. Then, the sliding buckle cylinder and the docking tube can be directly moved to switch, and the switching method is simple and stable.

[0019] 2. A vacuum piston is set up to quickly draw water. A variable volume effect can be produced by repeatedly pulling and pulling the vacuum piston. When the vacuum piston contracts, air is discharged through the upper one-way valve. When the vacuum piston extends, air is pumped out from the lower one-way valve. Water is extracted by generating negative pressure through pumping air. Water can be filled into the sampling test tube for sampling. The test tube filter cotton filled in the sampling test tube can conveniently store and intercept particles in the water, ensuring that the particles are at the bottom of the sampling test tube and convenient for inspection. After the test tube filter cotton is pulled out, it can be directly analyzed by an analyzer.

[0020] 3. The air-locking valve plate is set to provide a quantitative extraction function. The water level in the sampling tube continues to rise during sampling. When the water level is too high, the water contacts the buoyancy block, which is lifted by buoyancy, and then the air-locking valve plate rises synchronously to close the air hole. At this time, further extraction is impossible and sampling in the sampling tube is completed. Excess air in the sampling hand tube can be extracted during sampling to collect only water. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a test tube mounting frame in an embodiment of the present invention is shown;

[0022] Figure 2 The figure shows the axial structural schematic diagram of the test tube mounting frame in the embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of the use method of an embodiment of the present invention is shown;

[0024] Figure 4 The embodiment of the present invention is shown Figure 1 A schematic diagram of the structure after removing the sampling tube;

[0025] Figure 5 A schematic diagram of the assembly structure of the connecting frame in the embodiment of the present invention is shown;

[0026] Figure 6 The embodiment of the present invention is shown Figure 5 A schematic diagram of the structure viewed from above;

[0027] Figure 7 The schematic diagram of the assembly structure of the sampling test tube in the embodiment of the present invention is shown;

[0028] Figure 8A schematic diagram of a three-dimensional cross-sectional structure of a sampling test tube in an embodiment of the present invention is shown;

[0029] Fig. 9 The embodiment of the present invention is shown Figure 5 A local enlarged structural diagram of the part;

[0030] Fig.10 The embodiment of the present invention is shown Figure 8 Schematic diagram of the local enlarged structure at point B in the figure.

[0031] Reference numerals list

[0032] 1. Test tube mounting frame; 101. Support plate; 102. Piston frame; 103. Pumping piston; 104. One-way valve; 2. Guide frame; 201. Front dovetail groove; 202. Rear dovetail groove; 3. Connecting frame; 301. Upper guide cylinder; 302. Air outlet chamber; 303. Sliding buckle cylinder; 304. Exhaust hole; 305. Anti-rotation flange; 4. Butt pipe; 401. Closing valve; 402. Protruding frame; 403. Guide rod; 5. Sampling hand tube; 501. Filter screen cover; 6. Test tube holder; 7. Sampling test tube; 701. Check valve; 702. Threaded outer ring; 703. Sealing cover; 704. Air vent; 8. Closing valve plate; 801. Outer slide frame; 802. Buoyancy block; 9. Test tube filter. DETAILED DESCRIPTION

[0033] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention.

[0034] Example 1: Please refer to the attached drawings in the specification. Figures 1 to 10 As shown:

[0035] The present invention proposes a water quality sampling device for water conservancy projects, comprising: a test tube mounting frame 1, a guide frame 2 is fixedly arranged on the outside of the test tube mounting frame 1, the front side of the guide frame 2 is turned downward, and a front dovetail groove 201 is fixedly arranged at the front end of the guide frame 2; a vertical frame extending upward is integrally arranged on the top rear side of the guide frame 2, and a rear dovetail groove 202 is fixedly arranged between the vertical frames of the guide frames 2 on both sides; a connecting frame 3, a sliding block is arranged in the middle and lower part of the rear side of the connecting frame 3 and is slidably connected to the front dovetail groove 201; an upper guide cylinder 301 is integrally arranged on the top of the connecting frame 3, and an air outlet bin 302 is integrally arranged at the rear end of the upper guide cylinder 301; a sliding block is arranged in the middle of the upper guide cylinder 301 The buckle cylinder 303 and the upper and lower sides of the outer parts of the sliding buckle cylinder 303 are fixedly provided with limit flanges; the rear side of the sliding buckle cylinder 303 is provided with an exhaust hole 304, and the exhaust hole 304 can be aligned with the air outlet bin 302; the bottom of the connecting frame 3 is integrally provided with a round frame structure, and a docking tube 4 is slidably provided in the round frame structure, and a closing valve 401 is fixedly connected to the front end of the docking tube 4, and a steel wire hose is provided on the front side of the closing valve 401 to connect with a sampling hand tube 5, and the sampling hand tube 5 has the same length as the steel wire hose at this location; test tube holders 6 are fixedly provided equidistantly inside the test tube mounting frame 1, and sampling test tubes 7 are provided in the test tube holders 6; a check valve 701 is connected to the lower front side of the sampling test tube 7.

[0036] Among them, a support plate 101 is fixedly set at the bottom of the rear side of the test tube mounting frame 1, and a piston frame 102 is fixedly set at the top and rear side of the support plate 101; a vacuum piston 103 is fixedly set on the upper part of the interior of the piston frame 102; two groups of one-way valves 104 arranged up and down are fixedly set at the lower front side of the piston frame 102, and the bottom end of the vacuum piston 103 is connected to the two groups of one-way valves 104 by an air path; a pipeline is set at the front end of the lower one-way valve 104 to connect to the rear end of the air outlet bin 302.

[0037] Among them, a sliding block is provided at the bottom of the air outlet bin 302 and is slidably connected to the rear dovetail groove 202; an anti-rotation flange 305 is integrally provided on the front side of the sliding buckle cylinder 303, and the anti-rotation flange 305 is slidably connected to the upper guide cylinder 301; a spring is sleeved on the outside of the sliding buckle cylinder 303 at a position below the upper guide cylinder 301; a pull ring is integrally provided on the top of the sliding buckle cylinder 303; and the middle of the connecting frame 3 is an arc structure.

[0038] Among them, a protruding frame 402 is fixedly arranged on the external front side of the docking tube 4, a guide rod 403 is fixedly arranged on the upper rear side of the protruding frame 402, and the protruding frame 402 is slidably connected to the connecting frame 3; a spring is sleeved on the outside of the docking tube 4 at the rear side of the connecting frame 3; a pull ring is integrally arranged on the front side of the protruding frame 402.

[0039] Among them, the outside of the sampling hand tube 5 is provided with a scale for detecting the depth; a filter screen cover 501 is fixedly provided at the bottom tube mouth of the sampling hand tube 5, and the mesh of the filter screen cover 501 is smaller than the inner diameter of the sampling hand tube 5, which can ensure that large particles cannot pass through the filter screen cover 501 and be sucked into the sampling hand tube 5 to cause blockage.

[0040] Among them, a threaded outer ring 702 is fixedly provided on the upper part of the outside of the sampling test tube 7; the main body of the test tube holder 6 is a U-shaped structure, a circular groove is provided at the upper opening of the test tube holder 6, and a flange matching the circular groove is provided at the bottom of the threaded outer ring 702; both sides of the check valve 701 can be matched and clamped in the test tube holder 6; the rear end of the docking tube 4 can be fitted on the front end of the check valve 701, and a rubber sealing ring is fixedly provided at the rear end of the docking tube 4.

[0041] Among them, a sealing cover 703 is fixedly provided on the outside of the threaded outer ring 702 through a threaded connection, a vent hole 704 is opened on the top of the sealing cover 703, and an annular flange is integrally provided above the sealing cover 703, and the sliding buckle tube 303 can be fitted and buckled on the outside of the annular flange.

[0042] Among them, a shut-off valve plate 8 is arranged inside the sealing cover 703, and a downward-inclined outer slide 801 is integrally arranged outside the shut-off valve plate 8. The outer slide 801 is annular and limitedly slides inside the sealing cover 703; a buoyancy block 802 is fixedly arranged at the bottom of the shut-off valve plate 8.

[0043] The interior of the sampling test tube 7 is filled with a cylindrical test tube filter cotton 9 .

[0044] like Figure 1-10 As shown, when in use, the test tube mounting frame 1 is placed horizontally at the waterside or the bridge side, the sampling hand tube 5 is held and inserted into the water according to the sampling requirements, and the depth is determined according to the scale outside the sampling hand tube 5 to ensure that the designated position is sampled;

[0045] Open the closing valve 401, and then repeatedly pull and draw the air pumping piston 103, the air pumping piston 103 produces a variable volume effect, when the air pumping piston 103 contracts, the air is discharged through the upper one-way valve 104, and when the air pumping piston 103 extends, air is pumped from the lower one-way valve 104, and water is extracted by pumping air to generate negative pressure;

[0046] The air in the sampling hand tube 5 passes through the closing valve 401, the check valve 701, the outer slide frame 801, the air hole 704, the sliding buckle cylinder 303, the exhaust hole 304 and the one-way valve 104 below and enters the air extraction piston 103 in sequence;

[0047] After the air in the sampling hand tube 5 is extracted, water enters the sampling hand tube 5, passes through the steel hose and the closing valve 401, and then passes through the check valve 701 to enter the sampling test tube 7. The water level in the sampling test tube 7 continues to rise. When the water level is too high, the water contacts the buoyancy block 802, and the buoyancy block 802 is lifted by the buoyancy, and then the air-closing valve plate 8 rises synchronously to close the air vent 704. At this time, it is impossible to continue to draw, and the sampling in the sampling test tube 7 is completed.

[0048] This work can be completed by a single person or two people working together, wherein the length of the sampling hand tube 5 can be selected as needed and can also be flexibly replaced.

[0049] Example 2: On the basis of Example 1, when it is necessary to switch the sampling test tube 7, lift the sliding buckle cylinder 303 upwards with both hands, pull the protruding frame 402 forward, so that the sliding buckle cylinder 303 is separated from the sealing cover 703, and the butt joint tube 4 is separated from the check valve 701, and then directly move the sliding buckle cylinder 303 and the butt joint tube 4 to perform manual switching. After switching, repeat the steps of Example 1 to sample again;

[0050] The sliding buckle barrel 303 and the butt joint tube 4 also provide an auxiliary positioning function for the sampling test tube 7. The sliding buckle barrel 303 and the butt joint tube 4 can be removed to take out the sampling test tube 7.

[0051] Example 3: Based on Example 1, the device can be fixedly installed on the side of a ship for use. When sampling in some deeper waters and locations far from the shore, sampling can be carried out by boat. Accordingly, a longer sampling hand tube 5 can be selected, or even a combined pipeline can be used to make the sampling hand tube 5 to perform the extraction step.

[0052] Specific usage and function of this embodiment: In the present invention, sampling can be done on the bridge deck or on a boat according to the use needs, and two people are required to cooperate in the operation;

[0053] according to Figure 3 In this way, the test tube mounting frame 1 is laid flat, the sampling hand tube 5 is held and inserted into the water according to the sampling requirements, and the depth is determined according to the scale outside the sampling hand tube 5 to ensure that the designated position is sampled;

[0054] Open the closing valve 401, and then repeatedly pull and draw the air-extracting piston 103, so that the air-extracting piston 103 produces a variable volume effect. When the air-extracting piston 103 contracts, air is discharged through the upper one-way valve 104. When the air-extracting piston 103 extends, air is extracted from the lower one-way valve 104, and water is extracted by means of negative pressure generated by air extraction. The air in the sampling hand tube 5 passes through the closing valve 401, the check valve 701, the outer slide 801, the air vent 704 and the lower one-way valve 104 in sequence and enters the air-extracting piston 103.

[0055] After the air in the sampling hand tube 5 is extracted, water enters the sampling hand tube 5, passes through the steel hose and the closing valve 401, and then passes through the check valve 701 to enter the sampling test tube 7. The water level in the sampling test tube 7 continues to rise. When the water level is too high, the water contacts the buoyancy block 802, and the buoyancy block 802 is lifted by the buoyancy, and then the air-closing valve plate 8 rises synchronously to close the air vent 704. At this time, it is impossible to continue to draw, and the sampling in the sampling test tube 7 is completed.

[0056] After sampling is completed, when it is necessary to switch the sampling test tube 7, lift the sliding buckle cylinder 303 upwards with both hands, pull the protruding frame 402 forward, so that the sliding buckle cylinder 303 is separated from the sealing cover 703, and the butt joint tube 4 is separated from the check valve 701, and then directly move the sliding buckle cylinder 303 and the butt joint tube 4 to perform manual switching. After switching, repeat the above steps to sample again;

[0057] After all sampling is completed, the sampling tubes 7 can be removed. First, remove the sampling tubes 7 that can be directly removed, and then remove the sliding buckle cylinder 303 and the docking tube 4 to remove the remaining sampling tubes 7;

[0058] The test tube filter cotton 9 filled in the sampling test tube 7 can conveniently store and intercept particles in the water, ensure that the particles are at the bottom of the sampling test tube 7, and facilitate inspection. After the test tube filter cotton 9 is pulled out, it can be directly analyzed using an analyzer.

Claims

1. A water quality sampling device for water conservancy projects, characterized in that: include: A test tube mounting frame (1), wherein a guide frame (2) is fixedly arranged on the outside of the test tube mounting frame (1), the front side of the guide frame (2) is bent downward, and a front dovetail groove (201) is fixedly arranged at the front end of the guide frame (2); a vertical frame extending upward is integrally arranged on the top rear side of the guide frame (2), and a rear dovetail groove (202) is fixedly arranged between the vertical frames of the guide frames (2) on both sides; a connecting frame (3), wherein a sliding block is arranged at the middle and lower part of the rear side of the connecting frame (3) and is slidably connected to the front dovetail groove (201); an upper guide cylinder (301) is integrally arranged on the top of the connecting frame (3), and an air outlet bin (302) is integrally arranged at the rear end of the upper guide cylinder (301); a sliding buckle cylinder (303) is slidably arranged in the middle of the upper guide cylinder (301), and the sliding buckle cylinder (303) is slidably arranged in the middle of the upper guide cylinder (301), and the sliding buckle cylinder (303) is slidably arranged in the middle of the upper guide cylinder (301). Limiting flanges are fixedly provided on the upper and lower sides of the exterior of the cylinder (303); an exhaust hole (304) is provided on the rear side of the sliding buckle cylinder (303), and the exhaust hole (304) can be aligned with the air outlet bin (302); a circular frame structure is integrally provided at the bottom of the connecting frame (3), a butt joint pipe (4) is slidably provided in the circular frame structure, a closing valve (401) is fixedly connected to the front end of the butt joint pipe (4), a steel wire hose is provided on the front side of the closing valve (401) and connected to a sampling hand pipe (5), and the sampling hand pipe (5) is consistent in length with the steel wire hose at that location; a test tube holder (6) is fixedly provided at equal intervals inside the test tube mounting frame (1), and a sampling test tube (7) is provided in each of the test tube holders (6); a check valve (701) is connected to the front and lower sides of the sampling test tubes (7).

2. The water quality sampling device for water conservancy projects as claimed in claim 1, characterized in that: A support plate (101) is fixedly arranged at the bottom of the rear side of the test tube mounting frame (1), and a piston frame (102) is fixedly arranged at the rear side of the top of the support plate (101); a suction piston (103) is fixedly arranged at the upper part of the interior of the piston frame (102); two groups of one-way valves (104) arranged vertically are fixedly arranged at the lower part of the front side of the piston frame (102), and the bottom end of the suction piston (103) is connected to the two groups of one-way valves (104) by an air path; a pipeline is arranged at the front end of the lower one-way valve (104) to connect to the rear end of the air outlet bin (302).

3. The water quality sampling device for water conservancy projects as claimed in claim 1, characterized in that: A sliding block is provided at the bottom of the air outlet bin (302) and is slidably connected to the rear dovetail groove (202); an anti-rotation flange (305) is integrally provided on the front side of the sliding buckle cylinder (303), and the anti-rotation flange (305) is matched and slidably connected to the upper guide cylinder (301); a spring is sleeved on the outside of the sliding buckle cylinder (303) at a position below the upper guide cylinder (301); a pull ring is integrally provided on the top of the sliding buckle cylinder (303); and the middle of the connecting frame (3) is an arc-shaped structure.

4. The water quality sampling device for water conservancy projects as claimed in claim 1, characterized in that: A protruding frame (402) is fixedly arranged on the front side of the outside of the butt joint pipe (4), a guide rod (403) is fixedly arranged on the upper rear side of the protruding frame (402), and the protruding frame (402) is slidably connected to the connecting frame (3); a spring is sleeved on the outside of the butt joint pipe (4) at a position on the rear side of the connecting frame (3); and a pull ring is integrally arranged on the front side of the protruding frame (402).

5. The water quality sampling device for water conservancy projects as claimed in claim 1, characterized in that: The outside of the sampling hand tube (5) is provided with a scale for detecting depth; a filter screen (501) is fixedly provided at the bottom end of the sampling hand tube (5), and the mesh of the filter screen (501) is smaller than the inner diameter of the sampling hand tube (5).

6. The water quality sampling device for water conservancy projects as claimed in claim 1, characterized in that: A threaded outer ring (702) is fixedly arranged on the upper part of the outside of the sampling test tube (7); the main body of the test tube holder (6) is a U-shaped structure, a circular groove is provided at the upper opening of the test tube holder (6), and a flange matching the circular groove is provided at the bottom of the threaded outer ring (702); the two sides of the check valve (701) can be matched and clamped in the test tube holder (6); the rear end of the butt pipe (4) can be fitted on the front end of the check valve (701), and a rubber sealing ring is fixedly arranged on the rear end of the butt pipe (4).

7. The water quality sampling device for water conservancy projects as claimed in claim 6, characterized in that: A sealing cover (703) is fixedly provided on the outside of the threaded outer ring (702) via a threaded connection, a vent hole (704) is provided on the top of the sealing cover (703), an annular flange is integrally provided above the sealing cover (703), and a sliding buckle cylinder (303) can be fitted and buckled on the outside of the annular flange.

8. The water quality sampling device for water conservancy projects as claimed in claim 7, characterized in that: The sealing cover (703) is provided with a gas-locking valve plate (8), and the outside of the gas-locking valve plate (8) is integrally provided with an outer slide frame (801) inclined downward, the outer slide frame (801) is annular and limitedly slides in the sealing cover (703); a buoyancy block (802) is fixedly provided at the bottom of the gas-locking valve plate (8).

9. The water quality sampling device for water conservancy projects as claimed in claim 1, characterized in that: The interior of the sampling test tube (7) is filled with cylindrical test tube filter cotton (9).

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