Sampling device for water quality detection and method thereof

Abstract

The invention discloses a sampling device for water quality detection and a method thereof, and relates to the technical field of sampling, the sampling device comprises a floating block, the bottom of the floating block is provided with a rectangular guide rod, one side of an L-shaped mounting frame is provided with an intermittent extraction piece, and one side, far away from a first positioning ring, of the L-shaped mounting frame is provided with a fixed-distance blocking piece connected with the floating block. According to the water solution sampling device, an intermittent extraction piece and a fixed-distance blocking piece are arranged, a second telescopic air cylinder is started through a controller, when the second telescopic air cylinder stretches, a worm drives a worm gear to rotate by 120 degrees, and in the process, a cam extrudes an extrusion connecting pin through a protrusion, so that a water solution enters a sampling barrel; when the second telescopic air cylinder shrinks, the straight tooth ring rotates relative to the ratchet wheel, so that the cam rotates clockwise by 120 degrees when the second telescopic air cylinder stretches once, and water solutions with different depths can be extracted by matching with the fixed-distance blocking piece, so that the sampling range of equipment is expanded, and the sampling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling, and specifically to a sampling device and method for water quality detection. Background Art

[0002] The state of water quality is of great significance for its uses in large lakes, aquaculture ponds, ornamental fish ponds, industrial cooling water and other fields; the water quality of surface waters such as rivers, lakes and reservoirs is crucial for the quality of human production and life. At present, the technical means for water quality detection are mainly based on on-site sampling by sampling personnel, preservation under certain conditions, and transportation to the laboratory for testing.

[0003] Generally, when sampling surface waters such as rivers, lakes and reservoirs, the sampling equipment needs to be placed at the edge of the river to draw water. However, since the edges of rivers, lakes, etc. are relatively shallow, there are certain limitations when drawing and detecting the water at this location. When sampling the aqueous solution in the middle of the river, since it is necessary to detect the aqueous solutions at different depths, the staff needs to repeatedly operate the sampling equipment at this time. This not only increases the labor intensity of the staff, but also reduces the sampling efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a sampling device and method for water quality detection to solve the problem of low sampling efficiency.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A sampling device for water quality detection, including a floating block, a rectangular guide rod is installed at the bottom of the floating block, a limit frame is sleeved on the rectangular guide rod, a first positioning ring is installed on the outer side of the limit frame, an L-shaped mounting frame is installed on the outer wall of the first positioning ring, an intermittent extraction member is arranged on one side of the L-shaped mounting frame, a fixed-distance blocking member connected to the floating block is arranged on the side of the L-shaped mounting frame away from the first positioning ring, a power supply is installed on the top of the floating block, a traction rope is connected to one side of the power supply, a controller is installed at one end of the traction rope, and a sampling cylinder is installed at the bottom of the first positioning ring.

[0006] As a further solution of the present invention: The intermittent extraction member includes a second positioning ring installed on the top of the limit frame. The outer wall of the second positioning ring is rotatably connected with a cam through a bearing. One end of the L-shaped mounting frame close to the center of the second positioning ring is installed with a worm. The top of the cam is provided with a worm gear meshing with the worm. One end of the worm is rotatably connected with an open sleeve through a bearing. A straight tooth ring is installed on the outer wall of the open sleeve. One end of the worm is installed with a ratchet wheel located inside the open sleeve. The inner wall of the open sleeve is rotatably connected with a pawl through a rotating shaft. The connection between the pawl and the open sleeve is snap-connected with a torsion spring through a card slot. One side of the L-shaped mounting frame is installed with a large transmission straight gear meshing with the straight tooth ring. The side of the large transmission straight gear away from the L-shaped mounting frame is installed with a small transmission straight gear. One side of the L-shaped mounting frame is provided with a second telescopic cylinder. The output end of the second telescopic cylinder is connected with a straight rack meshing with the small transmission straight gear. The outer wall of the first positioning ring is installed with a guiding slide rail. An active slider is slidably connected inside the guiding slide rail. One side of the active slider is provided with a pressing connecting pin located above the first positioning ring. The bottom of the active slider is provided with a piston rod extending into the sampling cylinder.

[0007] As a further solution of the present invention: The center of the second positioning ring is coaxial with the center of the worm gear. A through hole penetrating from the top to the bottom of the worm gear is opened at the top of the worm gear.

[0008] As a further solution of the present invention: The diameter of the large transmission straight gear is larger than that of the small transmission straight gear. The center of the large transmission straight gear is coaxial with the center of the small transmission straight gear.

[0009] As a further solution of the present invention: The fixed-distance blocking member includes a measuring rod installed on the side of the L-shaped mounting frame away from the first positioning ring. A blocking block is sleeved on the measuring rod. A locking bolt is installed on the side of the blocking block away from the rectangular guide rod. The top of the floating block is installed with a first telescopic cylinder located above the power supply. The output end of the first telescopic cylinder is connected with an L-shaped connecting plate. A receiving groove is opened at the top of the floating block below the L-shaped connecting plate. One end of the bottom of the L-shaped connecting plate is installed with a connecting bin. A positioning plate is installed on the inner wall of the connecting bin. A second contact piece is installed on the top of the positioning plate. A pin extending outside the connecting bin is inserted into the connecting bin. The bottom of the pin is installed with a movable plate located inside the connecting bin. A first contact piece is arranged at the bottom of the movable plate. A telescopic spring connected to the inner wall of the connecting bin is installed at the bottom of the movable plate inside the first contact piece. A warning lamp is installed on the top of the power supply.

[0010] As a further solution of the present invention: The first contact piece is electrically connected to the power supply through a wire. The second contact piece is electrically connected to the warning lamp through a wire.

[0011] As a further solution of the present invention: a ball is rotatably connected to the top of the snap pin through a rotating shaft.

[0012] As a further solution of the present invention: the number of the barrier blocks and the number of the sampling cylinders are both three. The three barrier blocks are vertically arranged along the vertical central axis of the measuring rod, and the three sampling cylinders are equidistantly arranged along the center of the first positioning ring.

[0013] As a further solution of the present invention: a counterweight block is arranged at the bottom of the first positioning ring and is staggered with the sampling cylinder. When the cam is in the initial state, it is located between two adjacent sampling cylinders.

[0014] The present invention also discloses a sampling method for water quality detection, which uses the above-mentioned sampling device for water quality detection and includes the following steps: S1: First, operate the distance-determining barrier according to the sampling depth, then put the floating block into the river or lake, and hold the controller to connect the controller and the floating block through the traction of the traction rope. S2: The first positioning ring falls under the action of its own gravity. During this process, the first positioning ring is restricted by the distance-determining barrier, so that the first positioning ring stops moving down after falling to a certain depth. At this time, operate the intermittent extraction member to extract the aqueous solution. S3: Then operate the distance-determining barrier to make the first positioning ring lose its restriction and continue to move down. After falling to a certain depth, restrict the first positioning ring again, and then operate the intermittent extraction member to extract the aqueous solution at other depths. S4: By repeatedly operating the distance-determining barrier and the intermittent extraction member, the aqueous solutions at three different depths can be pumped into the sampling cylinder. S5: After the extraction is completed, drag the floating block to the shore by pulling the traction rope, and then take out the aqueous solutions inside the different sampling cylinders for detection.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting the intermittent extraction member and the distance-determining barrier, the second telescopic cylinder is started through the controller, so that the second telescopic cylinder expands and contracts once. When the second telescopic cylinder extends, the worm drives the worm wheel to rotate 120 degrees. During this process, the cam squeezes the extrusion connecting pin through the convex part, so as to make the aqueous solution enter the sampling cylinder. When the second telescopic cylinder contracts, the straight-tooth ring will rotate relative to the ratchet, so as to make the worm rotate in one direction, so that when the second telescopic cylinder expands and contracts once, the cam rotates 120 degrees clockwise. Cooperating with the distance-determining barrier, the aqueous solutions at different depths can be extracted, so as to improve the sampling range of the equipment and the sampling efficiency. 2. By setting a fixed-distance barrier, first adjust the position of the barrier block relative to the measuring rod according to the sampling depth, and then turn the locking bolt to achieve the fixed connection between the barrier block and the measuring rod. When the first positioning ring falls along the rectangular guide rod, the pin moves downward relative to the connection chamber due to the extrusion of the barrier block, so as to turn on the warning light. At this time, the staff operates the second telescopic cylinder to extend and retract once through the controller, and the aqueous solution at this depth can be extracted. Then, by operating the controller, the first telescopic cylinder extends and retracts once, and the bottom of the barrier block loses the shield and continues to fall with the first positioning ring. Then, the first telescopic cylinder extends to make the L-shaped connecting plate shield the next barrier block. Repeating this way can extract the aqueous solution at a specific depth, with simple operation and improved accuracy of extracting the aqueous solution at a specific depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic connection diagram of the L-shaped connecting plate and the barrier block of the present invention; Figure 3 is a schematic internal structure diagram of the connection chamber of the present invention; Figure 4 is a schematic connection diagram of the first positioning ring and the cam of the present invention; Figure 5 is a schematic connection diagram of the cam and the worm of the present invention; Figure 6 is a schematic connection diagram of the worm and the open-ended sleeve of the present invention; Figure 7 is a schematic connection diagram of the open-ended sleeve and the pawl of the present invention; Figure 8 is a schematic connection diagram of the guide rail and the movable slider of the present invention.

[0017] In the figure: 1. Floating block; 2. Rectangular guide rod; 3. Towing rope; 4. First positioning ring; 5. Guide rail; 6. Counterweight; 7. L-shaped connecting plate; 8. Locking bolt; 9. Barrier block; 10. Measuring rod; 11. Warning light; 12. Power supply; 13. Controller; 14. Pin; 15. First telescopic cylinder; 16. Receiving groove; 17. Connection chamber; 18. Movable plate; 19. First contact piece; 20. Second contact piece; 21. Positioning plate; 22. Telescopic spring; 23. Second telescopic cylinder; 24. Straight rack; 25. Large transmission straight gear; 26. Small transmission straight gear; 27. Second positioning ring; 28. Limiting frame; 29. Piston rod; 30. Movable slider; 31. Extrusion connecting pin; 32. Cam; 33. Worm gear; 34. Worm; 35. L-shaped mounting rack; 36. Ratchet; 37. Open-ended sleeve; 38. Straight tooth ring; 39. Pawl; 40. Torsion spring; 41. Sampling cylinder. Detailed implementation manners

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The embodiments of the present invention will be described below according to its overall structure.

[0020] As Figures 1 to 8 shown, in the embodiment of the present invention, a sampling device for water quality detection includes a floating block 1. A rectangular guide rod 2 is installed at the bottom of the floating block 1. A limit frame 28 is sleeved on the rectangular guide rod 2. A first positioning ring 4 is installed on the outer side of the limit frame 28. An L-shaped mounting frame 35 is installed on the outer wall of the first positioning ring 4. An intermittent extraction member is arranged on one side of the L-shaped mounting frame 35. A fixed-distance blocking member connected to the floating block 1 is arranged on the side of the L-shaped mounting frame 35 away from the first positioning ring 4. A power supply 12 is installed on the top of the floating block 1. One side of the power supply 12 is connected to a traction rope 3. One end of the traction rope 3 is installed with a controller 13. A sampling cylinder 41 is installed at the bottom of the first positioning ring 4.

[0021] In this embodiment: First, operate the distance - determining barrier according to the sampling depth. Then, place the floating block 1 into a river or a lake, hold the controller 13, and through the traction of the towing rope 3, connect the controller 13 with the floating block 1. Under the action of its own gravity, the first positioning ring 4 falls. During this process, the distance - determining barrier is used to limit the first positioning ring 4, so that the first positioning ring 4 stops moving downward after falling to a certain depth. At this time, operate the intermittent extraction part to extract the aqueous solution. Then, operate the distance - determining barrier to release the restriction on the first positioning ring 4 and continue to move downward. When it falls to a certain depth, restrict the first positioning ring 4 again. Then, operate the intermittent extraction part to extract the aqueous solution at other depths. Repeating this way, the aqueous solutions at three different depths can be pumped into the sampling cylinder 41. After the extraction is completed, drag the floating block 1 to the shore by pulling the towing rope 3. Subsequently, take out the aqueous solutions inside different sampling cylinders 41 for detection.

[0022] As Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 shown, the intermittent extraction part includes a second positioning ring 27 installed at the top of the limit frame 28. The outer wall of the second positioning ring 27 is rotatably connected with a cam 32 through a bearing. One end of the L - shaped mounting frame 35 close to the center of the second positioning ring 27 is installed with a worm 34. A worm gear 33 meshing with the worm 34 is arranged at the top of the cam 32. One end of the worm 34 is rotatably connected with an open - ended sleeve 37 through a bearing. A straight - tooth ring 38 is installed on the outer wall of the open - ended sleeve 37. A ratchet 36 located inside the open - ended sleeve 37 is installed at one end of the worm 34. An arrester 39 is rotatably connected to the inner wall of the open - ended sleeve 37 through a rotating shaft. A torsion spring 40 is clamped to the connection between the arrester 39 and the open - ended sleeve 37 through a clamping groove. A large - scale driving straight gear 25 meshing with the straight - tooth ring 38 is installed on one side of the L - shaped mounting frame 35. A small - scale driving straight gear 26 is installed on the side of the large - scale driving straight gear 25 away from the L - shaped mounting frame 35. A second telescopic cylinder 23 is arranged on one side of the L - shaped mounting frame 35. The output end of the second telescopic cylinder 23 is connected with a straight - tooth rack 24 meshing with the small - scale driving straight gear 26. A guiding slide rail 5 is installed on the outer wall of the first positioning ring 4. A movable slider 30 is slidably connected to the inside of the guiding slide rail 5. An extrusion connecting pin 31 located above the first positioning ring 4 is arranged on one side of the movable slider 30. A piston rod 29 extending into the sampling cylinder 41 is arranged at the bottom of the movable slider 30.

[0023] In this embodiment: The second telescopic cylinder 23 is started by the controller 13, so that the second telescopic cylinder 23 makes one telescopic movement. When the second telescopic cylinder 23 extends, the straight toothed ring 38 is driven to rotate through the straight rack 24 and the small transmission spur gear 26. At this time, the straight toothed ring 38 will drive the ratchet wheel 36 to rotate through the pawl 39, so as to make the worm 34 drive the worm wheel 33 to rotate 120 degrees. During this process, the cam 32 squeezes the extrusion connecting pin 31 through the convex part. At this time, the movable slider 30 moves in a direction away from the center of the first positioning ring 4. During this process, the piston rod 29 will move inside the sampling cylinder 41, so as to make the aqueous solution enter the sampling cylinder 41. When the second telescopic cylinder 23 contracts, the ratchet wheel 36 cannot limit the pawl 39. At this time, the straight toothed ring 38 will rotate relative to the ratchet wheel 36, so as to make the worm 34 rotate in one direction, so that when the second telescopic cylinder 23 makes one telescopic movement, the cam 32 rotates 120 degrees clockwise. Cooperating with the fixed-distance blocking member, the aqueous solution at different depths can be extracted, so as to increase the sampling range of the equipment and improve the sampling efficiency.

[0024] As Figure 2 , Figure 5 shown, the center of the second positioning ring 27 is coaxial with the center of the worm wheel 33, and a through hole penetrating from the top to the bottom of the worm wheel 33 is provided at the top of the worm wheel 33.

[0025] In this embodiment: By setting this structure, it is possible to prevent the worm wheel 33 from obstructing the rectangular guide rod 2, and at the same time ensure that the cam 32 rotates along the center of the first positioning ring 4.

[0026] As Figure 5 shown, the diameter of the large transmission spur gear 25 is larger than the diameter of the small transmission spur gear 26, and the center of the large transmission spur gear 25 is coaxial with the center of the small transmission spur gear 26.

[0027] In this embodiment: By setting this structure, when the second telescopic cylinder 23 extends, the large transmission spur gear 25 rotates concentrically with the small transmission spur gear 26, so as to increase the number of rotations of the straight toothed ring 38 when the small transmission spur gear 26 rotates one circle.

[0028] As Figures 1 to 4As shown in the figure, the fixed-distance barrier includes a measuring rod 10 installed on the side of the L-shaped mounting bracket 35 away from the first positioning ring 4. A barrier block 9 is sleeved on the measuring rod 10. A locking bolt 8 is installed on the side of the barrier block 9 away from the rectangular guide rod 2. On the top of the floating block 1, a first telescopic cylinder 15 is installed above the power supply 12. The output end of the first telescopic cylinder 15 is connected to an L-shaped connecting plate 7. A receiving groove 16 is formed on the top of the floating block 1 below the L-shaped connecting plate 7. At the bottom of one end of the L-shaped connecting plate 7, a connecting chamber 17 is installed. A positioning plate 21 is installed on the inner wall of the connecting chamber 17. A second contact piece 20 is installed on the top of the positioning plate 21. A pin 14 extending outside the connecting chamber 17 is inserted into the connecting chamber 17. At the bottom of the pin 14, a movable plate 18 is installed inside the connecting chamber 17. At the bottom of the movable plate 18, a first contact piece 19 is arranged. At the bottom of the movable plate 18, a telescopic spring 22 is installed inside the first contact piece 19 and connected to the inner wall of the connecting chamber 17. A warning light 11 is installed on the top of the power supply 12.

[0029] In this embodiment: First, adjust the position of the barrier block 9 relative to the measuring rod 10 according to the sampling depth, and then turn the locking bolt 8 to realize the fixed connection between the barrier block 9 and the measuring rod 10. When the first positioning ring 4 falls along the rectangular guide rod 2, the barrier block 9 will contact the L-shaped connecting plate 7 as the first positioning ring 4 falls. At this time, the pin 14 moves downward relative to the connecting chamber 17 due to the extrusion of the barrier block 9, so that the first contact piece 19 contacts the second contact piece 20. When the first contact piece 19 contacts the second contact piece 20, the warning light 11 is powered on and lights up. At this time, the staff operates the second telescopic cylinder 23 to perform a telescopic operation through the controller 13, and the aqueous solution at this depth can be extracted. Then, by operating the controller 13, the first telescopic cylinder 15 performs a telescopic operation. When the first telescopic cylinder 15 contracts, it drives the L-shaped connecting plate 7 and the barrier block 9 to be misaligned. At this time, the bottom of the barrier block 9 loses its shielding and continues to fall with the first positioning ring 4. At the same time, the first contact piece 19 separates from the second contact piece 20 under the action of the elastic restoring force of the telescopic spring 22, so that the warning light 11 goes out. Then, the first telescopic cylinder 15 extends to make the L-shaped connecting plate 7 shield the next barrier block 9. Repeating this way can extract the aqueous solution at a specific depth. The operation is simple, and the accuracy of extracting the aqueous solution at a specific depth is improved.

[0030] As Figure 2 、 Figure 3 shown, the first contact piece 19 is electrically connected to the power supply 12 through a wire, and the second contact piece 20 is electrically connected to the warning light 11 through a wire.

[0031] In this embodiment: By setting this structure, when the first contact piece 19 contacts the second contact piece 20, the warning light 11 is powered on and operates, so as to control the operation timing of the warning light 11.

[0032] As Figure 3 shown, a ball is rotatably connected to the top of the clamping pin 14 through a rotating shaft.

[0033] In this embodiment: By setting this structure, the friction between the clamping pin 14 and the blocking block 9 is reduced.

[0034] As Figure 1 , Figure 4 , Figure 8 shown, the number of the blocking blocks 9 and the number of the sampling cylinders 41 are both three. The three blocking blocks 9 are vertically arranged along the vertical central axis of the measuring rod 10, and the three sampling cylinders 41 are arranged equidistantly along the center of the first positioning ring 4.

[0035] In this embodiment: By setting this structure, the effect of sampling aqueous solutions at three different depths is achieved.

[0036] As Figure 8 shown, a counterweight block 6 staggered with the sampling cylinder 41 is arranged at the bottom of the first positioning ring 4. When the cam 32 is in the initial state, it is located between two adjacent sampling cylinders 41.

[0037] In this embodiment: By setting the counterweight block 6, the smoothness of the downward movement of the first positioning ring 4 relative to the rectangular guide rod 2 is improved, and at the same time, it is prevented that the cam 32 blocks the restoration of the extrusion connecting pin 31 after rotating one circle.

[0038] The following provides a sampling method for water quality detection in combination with the above-mentioned sampling device for water quality detection, which specifically includes the following steps: S1: First, adjust the position of the blocking block 9 relative to the measuring rod 10 according to the sampling depth, then turn the locking bolt 8 to realize the fixed connection between the blocking block 9 and the measuring rod 10, then put the floating block 1 into a river or a lake, and hold the controller 13, and realize the connection between the controller 13 and the floating block 1 through the traction of the traction rope 3; S2: When the first positioning ring 4 falls along the rectangular guide rod 2, the blocking block 9 will come into contact with the L-shaped connecting plate 7 as the first positioning ring 4 falls. At this time, the pin 14 moves downward relative to the connecting bin 17 due to the extrusion of the blocking block 9, so that the first contact piece 19 contacts the second contact piece 20. When the first contact piece 19 contacts the second contact piece 20, the warning lamp 11 is powered on and lights up. The second telescopic cylinder 23 is started through the controller 13, so that the second telescopic cylinder 23 makes a telescopic motion. When the second telescopic cylinder 23 extends, the straight tooth ring 38 is driven to rotate through the straight rack 24 and the small transmission spur gear 26. At this time, the straight tooth ring 38 drives the ratchet wheel 36 to rotate through the pawl 39, so that the worm 34 drives the worm wheel 33 to rotate 120 degrees. During this process, the cam 32 squeezes the extrusion connecting pin 31 through the protruding part. At this time, the movable slider 30 moves in a direction away from the center of the first positioning ring 4. During this process, the piston rod 29 moves inside the sampling cylinder 41, so that the aqueous solution enters the sampling cylinder 41. When the second telescopic cylinder 23 contracts, the ratchet wheel 36 cannot limit the pawl 39. At this time, the straight tooth ring 38 rotates relative to the ratchet wheel 36, so that the worm 34 rotates in one direction, so that when the second telescopic cylinder 23 makes a telescopic motion, the cam 32 rotates 120 degrees clockwise. Cooperating with the fixed-distance blocking member can extract the aqueous solution at different depths, so as to improve the sampling range of the equipment and improve the sampling efficiency; S3: Then, the first telescopic cylinder 15 is operated through the controller 13 to make a telescopic motion. When the first telescopic cylinder 15 contracts, it drives the L-shaped connecting plate 7 and the blocking block 9 to be misaligned. At this time, the bottom of the blocking block 9 loses its shield and continues to fall with the first positioning ring 4. At the same time, the first contact piece 19 separates from the second contact piece 20 under the action of the elastic restoring force of the telescopic spring 22, so that the warning lamp 11 goes out. Then the first telescopic cylinder 15 extends to make the L-shaped connecting plate 7 block the next blocking block 9; S4: By repeatedly operating the first telescopic cylinder 15 and the second telescopic cylinder 23, the aqueous solutions at three different depths can be pumped into the sampling cylinder 41; S5: After the extraction is completed, the floating block 1 is towed to the shore by pulling the towing rope 3, and then the aqueous solutions inside the different sampling cylinders 41 are taken out for detection.

[0039] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A sampling device for water quality detection, comprising a floating block (1), characterized in that: A rectangular guide rod (2) is installed at the bottom of the floating block (1), a limit frame (28) is sleeved on the rectangular guide rod (2), a first positioning ring (4) is installed on the outer side of the limit frame (28), an L-shaped mounting frame (35) is installed on the outer wall of the first positioning ring (4), an intermittent extraction member is arranged on one side of the L-shaped mounting frame (35), a distance barrier connected to the floating block (1) is arranged on the side of the L-shaped mounting frame (35) away from the first positioning ring (4), a power supply (12) is installed on the top of the floating block (1), a traction rope (3) is connected to one side of the power supply (12), a controller (13) is installed on one end of the traction rope (3), and a sampling tube (41) is installed at the bottom of the first positioning ring (4).

2. A sampling device for water quality detection according to claim 1, characterized in that: The intermittent extraction member comprises a second positioning ring (27) mounted on the top of the limiting frame (28); the outer wall of the second positioning ring (27) is rotatably connected to a cam (32) via a bearing; a worm (34) is mounted on one end of the L-shaped mounting frame (35) close to the center of the second positioning ring (27); a worm wheel (33) meshing with the worm (34) is disposed on the top of the cam (32); one end of the worm (34) is rotatably connected to an open sleeve (37) via a bearing; a spur gear ring (38) is mounted on the outer wall of the open sleeve (37); one end of the worm (34) is rotatably connected to a ratchet (39) located inside the open sleeve (37); the inner wall of the open sleeve (37) is rotatably connected to a ratchet (39) via a rotating shaft; a torsion spring (36) is clamped at a connection between the ratchet (39) and the open sleeve (37) via a clamping groove. 40), a large transmission spur gear (25) meshing with a spur gear ring (38) is installed on one side of the L-shaped mounting frame (35), a small transmission spur gear (26) is installed on the side of the large transmission spur gear (25) away from the L-shaped mounting frame (35), a second telescopic cylinder (23) is provided on one side of the L-shaped mounting frame (35), an output end of the second telescopic cylinder (23) is connected to a spur rack (24) meshing with the small transmission spur gear (26), a guide rail (5) is installed on the outer wall of the first positioning ring (4), a movable slider (30) is slidably connected to the inner side of the guide rail (5), an extrusion connecting pin (31) located above the first positioning ring (4) is provided on one side of the movable slider (30), and a piston rod (29) extending to the inside of the sampling tube (41) is provided at the bottom of the movable slider (30).

3. A sampling device for water quality detection according to claim 2, characterized in that: The center of the second positioning ring (27) is coaxial with the center of the worm wheel (33), and a through hole is provided at the top of the worm wheel (33) and penetrates to the bottom of the worm wheel (33).

4. A sampling device for water quality detection according to claim 2, characterized in that: The diameter of the large transmission spur gear (25) is greater than the diameter of the small transmission spur gear (26), and the center of the circle of the large transmission spur gear (25) is coaxial with the center of the circle of the small transmission spur gear (26).

5. A sampling device for water quality detection according to claim 2, characterized in that: The distance blocking member comprises a measuring rod (10) mounted on a side of an L-shaped mounting frame (35) away from the first positioning ring (4), a blocking block (9) being sleeved on the measuring rod (10), a locking bolt (8) being mounted on a side of the blocking block (9) away from the rectangular guide rod (2), a first telescopic cylinder (15) located above a power source (12) being mounted on the top of the floating block (1), an output end of the first telescopic cylinder (15) being connected to an L-shaped connecting plate (7), a receiving groove (16) being disposed below the L-shaped connecting plate (7) being disposed on the top of the floating block (1), and a connecting bin (17) being mounted at the bottom of one end of the L-shaped connecting plate (7) A positioning plate (21) is installed on the inner wall of the connection chamber (17), a second contact piece (20) is installed on the top of the positioning plate (21), a latch (14) extending to the outside of the connection chamber (17) is inserted into the interior of the connection chamber (17), a movable plate (18) located inside the connection chamber (17) is installed at the bottom of the latch (14), a first contact piece (19) is arranged at the bottom of the movable plate (18), a telescopic spring (22) located inside the first contact piece (19) and connected to the inner wall of the connection chamber (17) is installed at the bottom of the movable plate (18), and a warning light (11) is installed on the top of the power supply (12).

6. A sampling device for water quality detection according to claim 5, characterized in that: The first contact piece (19) is electrically connected to the power source (12) via a wire, and the second contact piece (20) is electrically connected to the warning light (11) via a wire.

7. A sampling device for water quality detection according to claim 5, characterized in that: The top of the latch (14) is rotatably connected to a ball via a rotating shaft.

8. A sampling device for water quality detection according to claim 5, characterized in that: The number of the blocking blocks (9) and the number of the sampling tubes (41) are both three. The three blocking blocks (9) are arranged vertically along the vertical center axis of the measuring rod (10), and the three sampling tubes (41) are arranged at equal distances along the center of the first positioning ring (4).

9. A sampling device for water quality detection according to claim 5, characterized in that: The bottom of the first positioning ring (4) is provided with a counterweight (6) arranged in an alternating manner with the sampling tubes (41); when the cam (32) is in an initial state, it is located between two adjacent sampling tubes (41).

10. A sampling method for water quality detection, characterized in that: A sampling device for water quality detection according to any one of claims 1 to 9 is used, comprising the following steps: S1: First, operate the distance barrier according to the sampling depth, then put the floating block (1) into the river or lake, and hold the controller (13), and connect the controller (13) and the floating block (1) by pulling the traction rope (3); S2: the first positioning ring (4) falls under the action of its own gravity. During this process, the first positioning ring (4) is restricted by the fixed-distance barrier, so that the first positioning ring (4) stops moving downward after falling to a certain depth. At this time, the aqueous solution is extracted by operating the intermittent extraction member; S3: Then, the first positioning ring (4) is freed from restriction and continues to move downward by operating the distance barrier, and after falling to a certain depth, the first positioning ring (4) is restricted again, and then the intermittent extraction member is operated to extract the aqueous solution at other depths; S4: By repeatedly operating the fixed-distance barrier and the intermittent extraction member, three aqueous solutions of different depths can be drawn into the sampling tube (41); S5: After the extraction is completed, the floating block (1) is dragged to the shore by pulling the traction rope (3), and then the aqueous solutions inside the different sampling tubes (41) are taken out for testing.

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