irrigation canal bank water quality monitoring station

Abstract

The application discloses an irrigation main canal bank-based water quality monitoring station, a top frame is fixed on the side of the station house which is away from the bank, a vertical shaft is fixed at the bottom of the top frame, a communication part for connecting a sampling pipe with the water body of the irrigation main canal is arranged on the side wall of the vertical shaft near the riverbed, a sampling pipe is coaxially arranged at the shaft center of the top end of the vertical shaft, the top side wall of the sampling pipe penetrates through the top frame and is fixed, a water flow following rotary frame which is rotatably connected is coaxially arranged on the sampling pipe, a rotary pipe is coaxially arranged at the top of the water flow following rotary frame, the top end of the rotary pipe is rotatably connected with the top frame through the bearing seat of a rotating speed measuring sensor, a driving rotary pipe is rotatably arranged on the coaxial shaft between the top frame and the water flow following rotary frame, and a pushing device which moves reciprocatingly along the axial direction is arranged on the outer side wall of the driving rotary pipe. According to the above structure, the irrigation main canal bank-based water quality monitoring station can realize the monitoring of the water quality and the water flow speed of the irrigation main canal through the vertical shaft structure arranged on the station house at the notch of the bank of the irrigation main canal.

Description

Technical Field

[0001] This invention relates to the technical field of water quality monitoring, specifically to a water quality monitoring station on the bank of an irrigation canal. Background Technology

[0002] The Subei Irrigation Main Canal stretches 168 kilometers from Gaoliangjian Sluice Gate on Hongze Lake in the west to Biandangang Port in Binhai County, where it flows into the Yellow Sea. It is one of the core projects in the Huai River management project. It serves multiple functions, including flood control, drainage, navigation, and irrigation, irrigating an area of ​​1.4325 million mu (approximately 95,567 hectares) and providing a stable water source for agriculture in the Subei Plain.

[0003] Since the main irrigation canal serves both navigation and irrigation functions, navigation poses certain safety risks to the water quality. To ensure the safety of farmland, long-term, regular monitoring of the canal's water quality is necessary. Currently, monitoring combines scheduled, fixed-point monitoring by management personnel with random, manual monitoring by boat along the canal's flow direction.

[0004] Fixed-point monitoring involves setting up multiple monitoring stations along the banks of the irrigation canal. However, these stations protrude from the canal, affecting navigation. Furthermore, because the stations are anchored to the canal bed by support pillars, the water flow over them accumulates floating debris on these pillars or in-water pipes. This debris hinders water quality monitoring, requiring manual removal of debris before each monitoring session. This increases workload and can even negatively impact water quality data at the stations, leading to inaccurate readings.

[0005] In addition, managers need to monitor the water flow velocity in the main irrigation canal to estimate the amount of sediment at the bottom of the riverbed. However, there is currently no equipment that can both sample the water quality of the main irrigation canal and monitor the water flow velocity, forcing managers to monitor these separately. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a water quality monitoring station on the bank of an irrigation canal. The station building, located at a gap on the bank of the irrigation canal, can be used to monitor the water quality and flow velocity of the irrigation canal.

[0007] The technical solution adopted in this invention is: The irrigation canal bank-based water quality monitoring station includes a station building located at a gap in the canal bank. A roof frame is fixed to the upper part of the side wall facing away from the bank. A vertical shaft is fixed to the bottom of the roof frame. The bottom end of the vertical shaft extends downwards and is fixed to a pit at a corresponding location in the riverbed. A connecting part is provided on the side wall of the vertical shaft near the riverbed, connecting a sampling tube to the water in the irrigation canal. The bottom end of the sampling tube is connected to the connecting part. The sampling tube is coaxially positioned at the top axis of the vertical shaft. The top side wall of the sampling tube extends upwards through the roof frame and is fixed to it. A rotatably connected water flow follower is coaxially fitted onto the sampling tube at the top position of the vertical shaft. The water flow follower is located below the water surface of the irrigation canal. The top of the water flow-following rotating frame is coaxially equipped with a rotating tube. The top end of the rotating tube extends upward and passes through the top frame, and is rotatably connected to the top frame through a bearing seat equipped with a speed measuring sensor. A drive rotating tube is coaxially sleeved on the outside of the rotating tube between the top frame and the water flow-following rotating frame. A material-moving device that can reciprocate axially is coaxially provided on the outer wall of the drive rotating tube. The material-moving device is circumferentially fixed to the drive rotating tube. A drive motor that is connected to the drive rotating tube is provided in the station building. The top end of the sampling tube extends upward through the rotating tube and the bearing seat and is connected to the sampling bucket through a liquid pump provided in the station building. A control box is also provided in the station building. The control box is electrically connected to the speed measuring sensor of the bearing seat, the drive motor and the liquid pump respectively.

[0008] A further improvement of the present invention is that the connecting part includes an outer tube and an inner tube, which are respectively separated and connected to vertical shafts located at the top and bottom of the connecting part by partitions A and B. The side wall of the outer tube is provided with multiple liquid passage holes A. The outer tube and the inner tube are coaxially arranged. The bottom end of the sampling tube passes through partition A and communicates with the inner tube. The inner diameter of the inner tube is larger than the inner diameter of the sampling tube. The inner tube is movably connected with an upward-facing movable tube groove. The outer side wall of the movable tube groove fits and matches the inner side wall of the inner tube. The bottom of the movable tube groove is uniformly provided with multiple liquid passage holes C. The lower part of the side wall of the inner tube is uniformly distributed with multiple liquid passage holes B. When the movable tube groove moves downward to contact the partition B, the top edge of the movable tube groove is higher than the liquid passage hole B located at the highest point. When the movable tube groove moves upward to the maximum stroke, the bottom of the movable tube groove is higher than the liquid passage hole B located at the highest point.

[0009] A further improvement of the present invention is that the distribution density of the liquid passage holes A increases from bottom to top, and the distribution density of the uppermost liquid passage hole A is the same as that of the liquid passage hole B.

[0010] A further improvement of the present invention is that the side wall of the sampling tube extending upward from the bearing seat is connected to the inlet of the pump through a liquid extraction tube; multiple sampling barrels are provided, each sampling barrel is connected to a corresponding sampling branch pipe, each sampling branch pipe is connected in parallel with the outlet pipe connected to the outlet of the pump, and each sampling branch pipe is provided with its own sampling valve.

[0011] A further improvement of the present invention is that the water flow following rotating frame includes a connecting pipe coaxially sleeved and fixed to the outside of the rotating pipe, and speed measuring cups uniformly fixed to the outer wall of the connecting pipe with the axis of the rotating pipe as the center. The speed measuring cups are respectively fixed to the connecting pipe through connecting plates. When the speed measuring cups are rotated to the point where they extend out of the bank edge gap and come into contact with the water flow of the irrigation canal, the mouth of the speed measuring cups faces the direction of the water flow of the irrigation canal.

[0012] A further improvement of the present invention is that the connecting plate has multiple layers, all of which are horizontally arranged thin plates, and are symmetrically arranged with the center horizontal plane of the speed measuring cup as the symmetry plane.

[0013] A further improvement of the present invention is that the material-dispensing device includes multiple material-dispensing rakes evenly distributed around the outer side of the drive tube with the axis of the drive tube as the center. The material-dispensing rakes are movably connected to the drive tube through floats. The rake teeth of the material-dispensing rakes are arranged at equal intervals from top to bottom. The floats are connected to the middle of the material-dispensing rakes.

[0014] A further improvement of the present invention is that the outer wall of the drive tube is uniformly provided with a plurality of axially arranged "T"-shaped grooves, the number of the "T"-shaped grooves being equal to the number of the feeding rakes, the end of the float facing the drive tube being provided with a connecting rod, the end of the connecting rod being provided with a slider, the slider being a strip structure arranged along a direction parallel to the axis of the drive tube, and the width of the slider and the width at the position where the connecting rod connects to the slider matching the cross-sectional groove shape of the "T"-shaped groove.

[0015] A further improvement of the present invention is that an arc-shaped material-blocking plate A is provided at the connection between the material-dispensing rake and the float plate on the side facing the direction of rotation. One end of the arc-shaped material-blocking plate A is located at the end where the material-dispensing rake and the float plate are connected. The bottom and top of the arc-shaped material-blocking plate A are respectively flush with the bottom rake teeth and the top rake teeth of the material-dispensing rake. Each arc-shaped material-blocking plate A is centrally symmetrical about the axis of the driving tube. The connection between the material-dispensing rake and the float plate is located on the side opposite to the direction of rotation, and an arc-shaped material-blocking plate B is also provided. One end of the arc-shaped material-blocking plate B is located at the end where the material-dispensing rake is connected to the float plate. The bottom and top of the arc-shaped material-blocking plate B are respectively flush with the bottom rake teeth and the top rake teeth of the material-dispensing rake. Each arc-shaped material-blocking plate B is centrally symmetrical about the axis of the drive tube. The rake teeth of the material-dispensing rake fixed to the float plate are sequentially inserted and fixed to the arc-shaped material-blocking plate B and the arc-shaped material-blocking plate A. The outer surface of the arc-shaped material-blocking plate B and the inner surface of the arc-shaped material-blocking plate A are the same arc surface. Both the arc-shaped material stop plate A and the arc-shaped material stop plate B are mesh plates.

[0016] A further improvement of the present invention is that a transmission tube is detachably fixed to the top end of the drive tube, the transmission tube is coaxially arranged with the drive tube, a driven wheel is coaxially arranged on the side wall of the transmission tube, a drive wheel is coaxially fixed to the output shaft of the drive motor, and the drive wheel and the driven wheel are connected in a transmission connection.

[0017] The beneficial effects of the invention are: First, the irrigation canal bank-based water quality monitoring station of the present invention can monitor the water quality and flow velocity of the irrigation canal through the vertical axis structure of the station building located at the gap on the bank of the irrigation canal.

[0018] Secondly, the irrigation canal bank-based water quality monitoring station of the present invention, through the object-shifting device installed on the vertical shaft, can shift floating objects that are close to or pass through the station building to the downstream side, so as to avoid the floating objects from accumulating at the gaps along the bank and affecting the water quality of the sampled water and the water flow velocity measurement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front sectional view of this application.

[0020] Figure 2 This is a top-view enlarged cross-sectional diagram of the middle part of the water sample pumping pipe in this application.

[0021] Figure 3 This is a top-view enlarged cross-sectional schematic diagram of the middle part of the water sample pumping pipe in this application.

[0022] Figure 4 This is a magnified front view sectional view of the water sample extraction pipe opening when no water is being extracted, as per this application.

[0023] Figure 5 This is a magnified front view sectional diagram of the water sample pumping pipe opening during the pumping process in this application.

[0024] Figure 6 This is a top-view enlarged cross-sectional schematic diagram of the water flow velocity servo mechanism of this application.

[0025] Figure 7 This is a top-view enlarged cross-sectional schematic diagram of the water surface debris removal device of this application. Detailed Implementation

[0026] Combination Figures 1-7 It is known that the irrigation canal bank-based water quality monitoring station includes a station building 1 located at the gap 11 on the bank of the irrigation canal. A top frame 4 is fixed to the upper part of the side wall of the station building 1 facing away from the bank. A vertical shaft 5 is fixed to the bottom of the top frame 4. The bottom end of the vertical shaft 5 extends downwards and is fixed to a pit 9 located at a corresponding position on the riverbed. A connecting part 6 is provided on the side wall of the vertical shaft 5 near the riverbed, connecting a sampling tube 14 to the water in the irrigation canal. The bottom end of the sampling tube 14 is connected to the connecting part 6. 4. The top sidewall of the sampling tube 14 is coaxially located at the top center of the vertical shaft 5. It passes upward through the top frame 4 and is fixed to the top frame 4. A water flow following rotating frame 7 is coaxially fitted around the sampling tube 14 at the top position of the vertical shaft 5. The water flow following rotating frame 7 is located below the water surface of the irrigation canal. A rotating tube 57 is coaxially located at the top of the water flow following rotating frame 7. The top of the rotating tube 57 extends upward through the top frame 4 and is rotatably connected to the top frame 4 through a bearing seat 15 equipped with a speed measuring sensor. The outer side of the rotating tube 57 is located between the top frame 4 and the water flow following rotating frame 7. A drive tube 18 is coaxially fitted and rotatably connected. A reciprocating object device 8 is coaxially provided on the outer wall of the drive tube 18. The object device 8 is circumferentially fixed to the drive tube 18. A drive motor 17 is provided in the station 1 and is connected to the drive tube 18. The top of the sampling tube 14 extends upward through the rotating tube 57 and the bearing seat 15 and is connected to the sampling bucket 12 through the liquid pump 13 provided in the station 1. A control box 16 is also provided in the station 1. The control box 16 is electrically connected to the rotation speed measuring sensor of the bearing seat 15, the drive motor 17 and the liquid pump 13 respectively.

[0027] The connecting part 6 includes an outer tube 42 and an inner tube 46, which are respectively separated and connected to vertical shafts 5 located at the top and bottom of the connecting part 6 by partitions A43 and B44. The side wall of the outer tube 42 is provided with multiple liquid passage holes A49. The outer tube 42 and the inner tube 46 are coaxially arranged. The bottom end of the sampling tube 14 passes through the partition A43 and communicates with the inner tube 46. The inner diameter of the inner tube 46 is larger than the inner diameter of the sampling tube 14. The inner tube 46 is movably connected vertically with an upward-facing slot 48. The outer wall of the movable tube 48 fits snugly against the inner wall of the inner tube 46. The bottom of the movable tube 48 is provided with a plurality of liquid passage holes C51 evenly distributed. The lower part of the side wall of the inner tube 46 is provided with a plurality of liquid passage holes B50 evenly distributed. When the movable tube 48 moves downward to contact the partition B44, the top edge of the movable tube 48 is higher than the liquid passage hole B50 at the highest point. When the movable tube 48 moves upward to the maximum stroke, the bottom of the movable tube 48 is higher than the liquid passage hole B50 at the highest point.

[0028] The distribution density of the liquid passage A49 increases from bottom to top, and the distribution density of the uppermost liquid passage A49 is the same as that of the liquid passage B50.

[0029] Multiple radial stiffeners B53 are uniformly fixed between the outer tube 42 and the inner tube 46 with the axis as the center.

[0030] The bottom surface of the partition A43 is located within the inner tube 46 and is provided with radial stiffeners C54 corresponding to the radial stiffeners B53 with the axis as the center. The inner side of the radial stiffeners C54 extends to the inner wall of the sampling tube 14. When the movable tube groove 48 moves upward to contact the bottom limit of the radial stiffeners C54, the bottom of the movable tube groove 48 is higher than the liquid passage hole B50 located at the highest point.

[0031] The vertical shaft 5 is a tubular structure. A core tube 41 is coaxially provided at the axis of the part of the vertical shaft 5 located below the connecting part 6. Multiple radial stiffeners A52 are uniformly fixed with the axis as the center between the part of the vertical shaft 5 located below the connecting part 6 and the core tube 41, and between the part of the vertical shaft 5 located above the connecting part 6 and the sampling tube 14.

[0032] The sampling tube 14, which extends upward from the bearing housing 15, is connected to the inlet of the pump 13 via the pumping tube 33.

[0033] The sampling bucket 12 is provided in multiple ways. Each sampling bucket 12 is connected to a corresponding sampling branch pipe. Each sampling branch pipe is connected in parallel with the outlet pipe of the liquid pump 13. Each sampling branch pipe is provided with its own sampling valve.

[0034] A horizontal liquid passage pipe 35 is connected to the side wall of the sampling tube 14 extending upward from the bearing seat 15, and the horizontal liquid passage pipe 35 is connected to a valve B37.

[0035] The liquid extraction pipe 33 and the horizontal liquid passage pipe 35 are respectively fixedly connected to the top frame 4 through the fixing frame 34.

[0036] The top end of the sampling tube 14 is detachably fixed with a sealing cap 36.

[0037] The water flow following rotating frame 7 includes a connecting pipe 56 coaxially sleeved and fixed to the outside of the rotating pipe 57, and a speed measuring cup 19 uniformly fixed to the outer wall of the connecting pipe 56 with the axis of the rotating pipe 57 as the center. The speed measuring cup 19 is fixed to the connecting pipe 56 through the connecting plate 20. When rotated away from the station building 1, the speed measuring cup 19 extends out of the bank edge notch 11 and contacts the water flow of the irrigation canal, and the mouth of the speed measuring cup faces the direction of the water flow of the irrigation canal.

[0038] The rotation direction of the speed measuring cup 19, which is rotated away from the station building 1, is parallel to the direction of the water flow passing through the speed measuring cup 19.

[0039] The connecting plate 20 has multiple layers, all of which are thin plates arranged horizontally, and are arranged symmetrically with the center horizontal plane of the speed measuring cup 19 as the symmetrical plane.

[0040] One side of the connecting plate 20 extends to be flush with the edge of the mouth of the speed measuring cup 19, and the other opposite side extends to the bottom of the speed measuring cup 19.

[0041] A further improvement of the present invention is that the speed measuring cup 19 has a hemispherical arc structure.

[0042] The connecting pipe 56 and the rotating pipe 57 are fixedly connected by radial stiffeners D58, and the radial stiffeners D59 are evenly distributed around the axis of the rotating pipe 57.

[0043] The outer wall of the connecting pipe 56 is flush with the outer wall of the vertical shaft 5.

[0044] The rotating tube 57 and the sampling tube 14 are rotatably connected by bearing A59.

[0045] The bearing seat 15 is fixedly connected to the top surface of the top frame 4 via the annular seat 24, and the sampling tube 14 extends upward out of the bearing seat 15 and is fixed to the top frame 4 via the bearing seat 15.

[0046] The rotational speed sensor of the bearing housing 15 is electrically connected to the control box 16 via data cable A25.

[0047] The material-dispensing device 8 includes multiple material-dispensing rakes 21 evenly distributed around the outer side of the drive tube 18 with the axis of the drive tube 18 as the center. The material-dispensing rakes 21 are movably connected to the drive tube 18 through floats 65. The rake teeth 60 of the material-dispensing rakes 21 are evenly spaced from top to bottom. The floats 65 are connected to the middle of the material-dispensing rakes 21.

[0048] The outer wall of the drive tube 18 is uniformly provided with a plurality of axially arranged "T" shaped grooves 27. The number of "T" shaped grooves 27 is equal to the number of feeding rakes 21. The float plate 65 is provided with a connecting rod 61 at one end facing the drive tube 18. The end of the connecting rod 61 is provided with a slider 62. The slider 62 is a strip structure arranged along the direction parallel to the axis of the drive tube 18. The width of the slider 62 and the width of the connecting rod 61 at the position where the slider 62 is connected match the cross-sectional groove shape of the "T" shaped groove 27.

[0049] The connection between the material-dispensing rake 21 and the float 65 is located on the side facing the direction of rotation, and an arc-shaped material-blocking plate A63 is also provided. One end of the arc-shaped material-blocking plate A63 is located at the end where the material-dispensing rake 21 is connected to the float 65. The bottom and top of the arc-shaped material-blocking plate A63 are respectively flush with the bottom rake tooth 60 and the top rake tooth 60 of the material-dispensing rake 21. Each arc-shaped material-blocking plate A63 is centrally symmetrical about the axis of the drive tube 18.

[0050] The connection between the material-dispensing rake 21 and the float 65 is located on the side opposite to the direction of rotation, and an arc-shaped material-blocking plate B64 is also provided. One end of the arc-shaped material-blocking plate B64 is located at the end where the material-dispensing rake 21 is connected to the float 65. The bottom and top of the arc-shaped material-blocking plate B64 are respectively flush with the bottom rake tooth 60 and the top rake tooth 60 of the material-dispensing rake 21. Each arc-shaped material-blocking plate B64 is centrally symmetrical about the axis of the drive tube 18. The rake teeth 60 of the material-dispensing rake 21, which is fixed to the float 65, are sequentially inserted and fixed to the arc-shaped material-blocking plate B64 and the arc-shaped material-blocking plate A63. The outer surface of the arc-shaped material-blocking plate B64 and the inner surface of the arc-shaped material-blocking plate A63 are the same arc surface.

[0051] The end of the arc-shaped baffle plate B64 connected to any material rake 21 that is away from the material rake 21 overlaps with the opposite end of the arc-shaped baffle plate A63 connected to the adjacent material rake 21 on the same side in the circumferential direction centered on the axis of the drive tube 18. The arc-shaped baffle plates A63 and B64 connected to each material rake 21 form a ring baffle plate in the circumferential direction centered on the axis of the drive tube 18.

[0052] Both the arc-shaped material stop plate A63 and the arc-shaped material stop plate B64 are mesh plates.

[0053] The connecting rod 61 is connected to the middle of the slider 62.

[0054] The drive tube 18 and the sampling tube 14 are rotatably connected by bearing B66.

[0055] The top end of the drive tube 18 is detachably fixedly connected to a transmission tube 31. The transmission tube 31 is coaxially arranged with the drive tube 18. A driven wheel 29 is coaxially provided on the side wall of the transmission tube 31. A drive wheel 28 is coaxially fixed on the output shaft of the drive motor 17. The drive wheel 28 and the driven wheel 29 are connected in a transmission manner.

[0056] The bottom of the top frame 4 is also provided with a transmission wheel A30 located between the drive wheel 28 and the driven wheel 29. The drive wheel 28 is connected to the driven wheel 29 through the transmission wheel A30.

[0057] When multiple vertical shafts 5 are sequentially arranged at the bottom of the top frame 4 along the water flow direction of the irrigation canal, only one vertical shaft 5 has a driven wheel 29 in its transmission pipe 31 that is connected to the drive wheel 28. Each transmission pipe 31 also has a corresponding coaxial transmission wheel B32. The transmission wheels B32 in the transmission pipes 31 of each vertical shaft 5 are connected by a transmission belt or transmission chain, so that the drive pipes 18 of each vertical shaft 5 rotate synchronously, at the same speed and in the same direction.

[0058] At the bottom of the top frame 4, on the side of the top frame 4 away from the station building 1, there is also a camera 38 for observing the vertical axis 5 and the irrigation canal located upstream of the vertical axis 5.

[0059] The data line A25, the control line A and power line A of the drive motor 17, the control line B and power line B of the liquid pump 13, and the control line C and power line C of the camera 38 form a wiring harness 26 that is electrically connected to the control box 16.

[0060] The bottom plate 23 at the bottom of the station building 1 is provided with a spare sampling hole 39 in the middle, and the top of the spare sampling hole 39 is provided with an openable and closable cover plate 40.

[0061] The top surface of the cover plate 40 is flush with the top surface of the bottom plate 23.

[0062] The bottom of the base plate 23 of the station building 1 is fixedly connected to the riverbed at the gap 11 on the bank by the support column 10.

[0063] The side of the station building 1 facing the riverbank is connected to the corresponding riverbank via a bridge corridor 2. The side wall of the station building 1 facing the riverbank is provided with an openable and closable door 3 at the location of the bridge corridor 2.

[0064] The control box 16 is located inside the station building 1 on the side where the door 3 is located. The sampling bucket 12 is located inside the station building 1 on the corresponding side opposite to the side where the door 3 is located, and is evenly spaced along the wall extension direction of the corresponding side.

[0065] When this application is used, the pump 13 is started periodically to draw water samples from the irrigation canal into the sampling bucket 12; by opening and closing the corresponding sampling valve, the water samples drawn by the pump 13 each time it is started are drawn into different sampling buckets 12; the periodic start of the pump 13 can be initiated by staff after periodic inspections of the corresponding station 1, or by the controller in the control box 16 periodically controlling the start of the pump 13, or by remotely controlling the start of the pump 13 through the communication device.

[0066] When the pump 13 is not working, the movable tube 48 in the connecting part 6 moves downward along the inner cavity 47 of the inner tube 46 under the action of gravity until it contacts the partition B44 at the bottom. At this time, the liquid passage B50 of the inner tube 46 is blocked by the wall of the movable tube 48, and the liquid passage C51 at the bottom of the movable tube 48 is blocked by the partition B44. Therefore, the water in the irrigation canal cannot enter the inner cavity 47 through the liquid passage B50. When the pump 13 is working, the pump 13 creates a negative pressure in the sampling cavity 45 and the inner cavity 47 of the sampling tube 14. This allows the movable tube 48 to move upward along the inner cavity 47 of the inner tube 46 under the action of negative pressure, overcoming gravity. At this time, the water in the irrigation canal can enter the sampling cavity 45 and is drawn into the corresponding sampling bucket 12 after passing through the liquid passage B50 and the liquid passage C51 in sequence.

[0067] After the movable tube 48 moves upward to a certain height, the pumping speed of the sampling tube 45 will be balanced with the negative pressure of the pumping pump 13, so that the movable tube 48 is stabilized at a certain height of the inner tube 47.

[0068] After the water sample from the main irrigation canal is extracted, the pump 13 stops working, and then the negative pressure in the sampling chamber 45 is lost. At this time, the movable tube 48 gradually falls to the bottom of the inner chamber 47 and contacts the partition B44.

[0069] When extracting water samples from the main irrigation canal, the water first enters the space between the outer pipe 42 and the inner pipe 46 through the liquid passage A49 of the outer pipe 42, then enters the inner pipe cavity 47 located below the movable pipe groove 48 through the liquid passage B50 of the inner pipe 46, and finally passes upward through the liquid passage C51 of the movable pipe groove 48 and enters the sampling cavity 45 of the sampling tube 14. Because the distribution density of the liquid passage holes A49 increases from bottom to top, when drawing water samples from the irrigation canal, the water entering the area between the outer pipe 42 and the inner pipe 46 enters at a greater speed above the outer pipe 42 than below it. Furthermore, since the liquid passage hole B50 is located below the inner pipe 46, the water above the area between the outer pipe 42 and the inner pipe 46 flows not only from the outside to the inside but also downwards along the axial direction of the connecting part 6 before entering the inner pipe cavity 47 through the liquid passage hole B50. This axial flow along the connecting part 6 creates a flushing effect on the area between the outer pipe 42 and the inner pipe 46, thus flushing away particulate impurities stuck in the liquid passage holes A49 and ensuring the liquid flow efficiency of each liquid passage hole A49. In addition to supporting the connecting part 6 and connecting the outer pipe 42 and the inner pipe 46, the radial stiffener B53 also guides the water flow into the inner pipe cavity 47.

[0070] When this application is used, the water in the irrigation canal flows from upstream to downstream of the location of the station 1. Since the station 1 is located at the bank gap 11, the speed measuring cup 19, which is rotated away from the station 1, extends out of the bank gap 11 and contacts the water flow in the irrigation canal. The mouth of the speed measuring cup faces the direction of the water flow in the irrigation canal. Therefore, the water flow in the irrigation canal will drive the water flow to rotate with the rotating frame 7, which in turn drives the rotating tube 57 to rotate. The rotation speed of the rotating tube 57 is measured and recorded by the speed measuring sensor of the bearing seat 15. Technicians or the control box 16 can calculate the water flow velocity in the irrigation canal based on the size of the speed measuring cup 19, the radial distance between it and the axis of the rotating tube 57, and other relevant parameters. The water flow velocity is recorded and stored. Alternatively, the water flow velocity data can be transmitted to the management department through the communication device of the control box 16.

[0071] When this application is used, when the control box 16 receives the image observed by the camera 38 and finds that aquatic plants or other floating objects are floating near or passing the station building 1 on the upstream water surface of the irrigation canal, the control box 16 controls the drive motor 17 to start, thereby driving the drive tube 18 to rotate, which in turn drives the material-dispensing rake 21 to rotate, thereby dispensing the floating objects downstream, preventing the floating objects from floating into the bank gap 11 and accumulating at the bank gap 11, thus avoiding affecting the water sample collected from the irrigation canal at that location and the monitored water flow velocity at that location; the arc-shaped material-dispensing plates A63 and B64 surround the area around the axis of the drive tube 18. The ring-shaped baffle plate, with both the arc-shaped baffle plate A63 and the arc-shaped baffle plate B64 being mesh plates, further prevents floating objects from getting tangled at the vertical shaft 5 position and affecting the water flow velocity at that position. In addition, due to the function of the float plate 65 and the connection between the slider 62 of the connecting rod 61 and the "T"-shaped groove 27, each material-pushing rake 21 and the corresponding fixedly connected arc-shaped baffle plate A63 and arc-shaped baffle plate B64 can float up and down independently with the water waves. This allows the material-pushing rake 21 and the arc-shaped baffle plate A63 and arc-shaped baffle plate B64 to move up and down with the water waves, thus always being able to push away and block floating objects on the water surface. When the connection point of the bank gap 11 to the irrigation canal is relatively small, only one vertical shaft 5 needs to be installed in the station building 1; when the connection point of the bank gap 11 to the irrigation canal is relatively large, the station building 1 needs to install multiple vertical shafts 5 in sequence along the water flow direction of the irrigation canal at the connection point of the bank gap 11 to the irrigation canal to ensure that floating objects cannot enter the bank gap 11.

[0072] If there are many floating objects on the surface of the irrigation canal, the drive motor 17 can be kept running directly without waiting for the camera 38 to observe that floating objects are approaching or passing the station 1, so that the material rake 21 and the annular retaining plate can continuously push away the floating objects.

[0073] The backup sampling hole 39 provided in station building 1 also allows for direct sampling by manually opening the cover plate 40 and then directly downwards through the backup sampling hole 39 in case of equipment failure or other special circumstances.

[0074] This application also applies to irrigation canals or other rivers or other water bodies in other areas where water quality and flow velocity need to be monitored regularly.

Claims

1. A water quality monitoring station on the bank of an irrigation canal, characterized in that: The station (1) is located at the gap (11) on the bank of the main irrigation canal. A top frame (4) is fixed to the upper part of the side wall of the station (1) facing away from the bank. A vertical shaft (5) is fixed to the bottom of the top frame (4). The bottom end of the vertical shaft (5) extends downward and is fixed to the foundation pit (9) set at the corresponding position on the riverbed. The side wall of the vertical shaft (5) is provided with a connecting part (6) near the riverbed to connect the sampling tube (14) to the water body of the main irrigation canal. The bottom end of (14) is connected to the connecting part (6). The sampling tube (14) is coaxially located at the top axis of the vertical shaft (5). The top side wall of the sampling tube (14) passes upward through the top frame (4) and is fixed to the top frame (4). The sampling tube (14) is coaxially fitted with a water flow following rotating frame (7) corresponding to the top position of the vertical shaft (5). The water flow following rotating frame (7) is located below the water surface of the irrigation canal. The top of the water flow following rotating frame (7) is coaxially provided with A rotating tube (57) extends upwards from its top end, passing through the top frame (4) and then rotatably connected to the top frame (4) via a bearing seat (15) equipped with a speed measuring sensor. A drive rotating tube (18) is coaxially fitted on the outer side of the rotating tube (57) between the top frame (4) and the water flow-following rotating frame (7), and a reciprocating object-moving device (8) is coaxially mounted on the outer wall of the drive rotating tube (18). The object-moving device (8) and the drive rotating tube (57) are connected... 18) Circumferentially fixed, the station building (1) is equipped with a drive motor (17) that is connected to the drive rotating tube (18). The top of the sampling tube (14) extends upward through the rotating tube (57) and the bearing seat (15) and is connected to the sampling bucket (12) through the liquid pump (13) installed in the station building. The station building (1) is also equipped with a control box (16). The control box (16) is electrically connected to the speed measuring sensor of the bearing seat (15), the drive motor (17) and the liquid pump (13) respectively.

2. The irrigation canal bank-based water quality monitoring station as described in claim 1, characterized in that: The connecting part (6) includes an outer tube (42) and an inner tube (46) connected to the vertical shaft (5) located at the top and bottom of the connecting part (6) respectively by partition A (43) and partition B (44). The side wall of the outer tube (42) is provided with a plurality of liquid passage holes A (49). The outer tube (42) and the inner tube (46) are coaxially arranged. The bottom end of the sampling tube (14) passes through the partition A (43) and communicates with the inner tube (46). The inner diameter of the inner tube (46) is larger than the inner diameter of the sampling tube (14). The inner tube (46) is movably connected vertically with a groove opening facing upward. The outer wall of the movable tube groove (48) is fitted and matched with the inner wall of the inner tube (46). The bottom of the movable tube groove (48) is uniformly provided with a plurality of liquid passage holes C (51). The lower part of the side wall of the inner tube (46) is uniformly provided with a plurality of liquid passage holes B (50). When the movable tube groove (48) moves downward to contact the partition plate B (44), the top edge of the movable tube groove (48) is higher than the liquid passage hole B (50) at the highest point. When the movable tube groove (48) moves upward to the maximum stroke, the bottom of the movable tube groove (48) is higher than the liquid passage hole B (50) at the highest point.

3. The irrigation canal bank-based water quality monitoring station as described in claim 2, characterized in that: The distribution density of the liquid passage A (49) increases from bottom to top, and the distribution density of the uppermost liquid passage A (49) is the same as that of the liquid passage B (50).

4. The irrigation canal bank-based water quality monitoring station as described in claim 1, characterized in that: The side wall of the sampling tube (14) extending upward from the bearing seat (15) is connected to the inlet of the pump (13) through the pumping tube (33); there are multiple sampling barrels (12), each sampling barrel (12) is connected to a corresponding sampling branch pipe, each sampling branch pipe is connected in parallel with the outlet pipe connected to the outlet of the pump (13), and each sampling branch pipe is equipped with its own sampling valve.

5. The irrigation canal bank-based water quality monitoring station as described in claim 1, characterized in that: The water flow following rotating frame (7) includes a connecting pipe (56) coaxially sleeved and fixed to the outside of the rotating pipe (57), and a speed measuring cup (19) uniformly fixed to the outer wall of the connecting pipe (56) with the axis of the rotating pipe (57) as the center. The speed measuring cup (19) is fixed to the connecting pipe (56) through the connecting plate (20). When the speed measuring cup (19) is rotated away from the station building (1), it extends out of the bank edge gap (11) and contacts the water flow of the irrigation canal. The mouth of the speed measuring cup faces the direction of the water flow of the irrigation canal.

6. The irrigation canal bank-based water quality monitoring station as described in claim 5, characterized in that: The connecting plate (20) has multiple layers, all of which are thin plates arranged horizontally, and are arranged symmetrically with the center horizontal plane of the speed measuring cup (19) as the symmetrical plane.

7. The irrigation canal bank-based water quality monitoring station as described in claim 1, characterized in that: The material-dispensing device (8) includes multiple material-dispensing rakes (21) evenly distributed around the outside of the drive tube (18) with the axis of the drive tube (18) as the center. The material-dispensing rakes (21) are connected to the drive tube (18) vertically via floats (65). The rake teeth (60) of the material-dispensing rakes (21) are evenly spaced from top to bottom. The floats (65) are connected to the middle of the material-dispensing rakes (21).

8. The irrigation canal bank-based water quality monitoring station as described in claim 7, characterized in that: The outer wall of the drive tube (18) is uniformly provided with a plurality of axially arranged "T" shaped grooves (27). The number of "T" shaped grooves (27) is equal to the number of feeding rakes (21). The float (65) is provided with a connecting rod (61) at one end facing the drive tube (18). The end of the connecting rod (61) is provided with a slider (62). The slider (62) is a strip structure arranged along the direction parallel to the axis of the drive tube (18). The width of the slider (62) and the width of the connecting rod (61) at the position where the slider (62) is connected are matched with the cross-sectional groove shape of the "T" shaped groove (27).

9. The irrigation canal bank-based water quality monitoring station as described in claim 8, characterized in that: The connection between the material rake (21) and the float (65) is located on the side facing the direction of rotation, and an arc-shaped material blocking plate A (63) is also provided. One end of the arc-shaped material blocking plate A (63) is located at the end where the material rake (21) and the float (65) are connected. The bottom and top of the arc-shaped material blocking plate A (63) are respectively aligned with the bottom rake teeth and the top rake teeth (60) of the material rake (21). Each arc-shaped material blocking plate A (63) is centrally symmetrical about the axis of the drive tube (18). The connection between the material-dispensing rake (21) and the float plate (65) is located on the side opposite to the direction of rotation, and an arc-shaped material-blocking plate B (64) is also provided. One end of the arc-shaped material-blocking plate B (64) is located at the end where the material-dispensing rake (21) and the float plate (65) are connected. The bottom and top of the arc-shaped material-blocking plate B (64) are respectively aligned with the bottom rake teeth (60) and the top rake teeth (60) of the material-dispensing rake (21). Each arc-shaped material-blocking plate B (64) is centrally symmetrical about the axis of the drive tube (18). The rake teeth (60) of the material-dispensing rake (21) fixed to the float plate (65) are sequentially inserted and fixed to the arc-shaped material-blocking plate B (64) and the arc-shaped material-blocking plate A (63). The outer surface of the arc-shaped material-blocking plate B (64) and the inner surface of the arc-shaped material-blocking plate A (63) are the same arc surface. Both the arc-shaped material stop plate A (63) and the arc-shaped material stop plate B (64) are mesh plates.

10. The irrigation canal bank-based water quality monitoring station as described in claim 7, characterized in that: The top end of the drive tube (18) is detachably fixedly connected to a transmission tube (31). The transmission tube (31) is coaxially arranged with the drive tube (18). The side wall of the transmission tube (31) is coaxially provided with a driven wheel (29). The output shaft of the drive motor (17) is coaxially fixed with a drive wheel (28). The drive wheel (28) and the driven wheel (29) are connected in a transmission manner.

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