A water flow measuring device based on high-sediment water delivery channel for precision irrigation

Abstract

The application relates to the technical field of water flow measurement, and discloses a water flow measurement device based on a high-sediment water conveying channel for precise irrigation, which comprises a base fixedly connected to the bottom of the water conveying channel, a buoyancy plate, a scissor holder rotatably connected between the two sides of the base, a measuring cylinder, an installation frame rotatably connected to the middle part of the scissor holder, and telescopic rods fixed to the two sides of the measuring cylinder and fixed to the installation frame at the telescopic ends of the telescopic rods. Through the cooperation of the water flow thrust and the driving motor, the energy-saving effect is improved, the water-driven impeller is driven to rotate, the setting of the rotating disc, the push-pull rod and the piston plate is matched, the gas is continuously stored in the gas storage cavity, finally, the airflow thrust drives the rotating ring to intermittently rotate in the forward and reverse directions, the measurement position of the Doppler flowmeter is adjusted, the measurement data of multiple points are obtained, the measurement results are compared and corrected, and finally the measurement precision is improved.

Description

Technical Field

[0001] This invention relates to the field of water flow measurement technology, specifically to a water flow measurement device for precision irrigation based on a high-sediment conveying canal. Background Technology

[0002] With the increasing scarcity of water resources and the acceleration of agricultural modernization, precision irrigation technology is playing an increasingly important role in water-saving agriculture. Precision irrigation relies on real-time and accurate monitoring of parameters such as water flow, water quality, and sediment content in water conveyance channels. However, in Northwest my country, such as Inner Mongolia, a large amount of irrigation water comes from the Yellow River and its tributaries. The water conveyance channels generally have high sediment content and complex water quality, which poses a severe challenge to traditional water flow measurement technology.

[0003] Common methods for measuring water flow include ultrasonic time-of-flight flowmeters, electromagnetic flowmeters, radar flowmeters, and Doppler-based velocimeters. Among these, Doppler velocimeters are widely used in high-sediment environments due to their non-contact or insertion-based measurement capabilities and strong resistance to suspended matter interference. However, the following prominent problems still exist in practical applications: Traditional fixed Doppler probes can only measure the flow velocity at a fixed location, which is difficult to reflect the average flow velocity of the cross section, resulting in large measurement errors. Moreover, in order to verify the reliability of the measurement data, it is often necessary to manually sample and analyze the sediment content at regular intervals, which is time-consuming and labor-intensive, and it is difficult to ensure the representativeness of the sampling time. Therefore, a water flow measurement device based on a high sediment conveying canal for precision irrigation is proposed. Summary of the Invention

[0004] This invention provides a water flow measurement device for precision irrigation based on a high-sediment conveying canal. Through the cooperation of water flow thrust and a drive motor, a water-powered impeller rotates, continuously accumulating air into the air storage chamber. Finally, the airflow thrust drives the rotating ring to rotate intermittently in both directions, adjusting the position of the Doppler current meter to obtain measurement data from multiple points. This allows for comparison and correction of the measurement results, thereby improving the final measurement accuracy. This solves the problem mentioned in the background art where single-point detection is insufficient to reflect the average flow velocity of the cross-section, leading to large measurement errors.

[0005] This invention provides the following technical solution: A water flow measurement device for precision irrigation based on a high-sediment conveying canal includes a base fixedly connected to the bottom of the canal, a buoyancy plate, a scissor frame rotatably connected between the buoyancy plate and both sides of the base, a measuring cylinder, a mounting frame rotatably connected to the side wall of the hinge point in the middle of the scissor frame, telescopic rods fixedly connected to both sides of the measuring cylinder, and the telescopic ends of the telescopic rods fixed to the mounting frame, wherein a sealed chamber is provided inside the measuring cylinder, a rotating ring is rotatably connected inside the sealed chamber, two sets of Doppler current meters are symmetrically installed on the inner wall of the rotating ring, and an air storage unit is provided on the buoyancy plate to drive the rotating ring to intermittently reciprocate; and a detection unit, two sets of which are respectively installed on both sides of the buoyancy plate, used to detect the sediment content in the canal and to take samples for storage.

[0006] As a preferred embodiment of the present invention, the air storage unit includes an air storage chamber, which is fixedly connected to the top of the buoyancy plate. A drive shaft is rotatably connected between the inner walls of the two sides of the air storage chamber. A water turbine is fixedly connected to the outer wall of the drive shaft. A drive motor is fixedly connected to the top of one side of the air storage chamber. The drive motor and the drive shaft are connected by a belt pulley assembly.

[0007] As a preferred embodiment of the present invention, the gas storage chamber is provided with a gas storage cavity and two sets of piston cavities. The piston cavities and the gas storage cavity are connected by a gas storage pipe, and a one-way valve is provided in the gas storage pipe. A piston plate is slidably connected in the piston cavity, and a push-pull rod is rotatably connected to the side wall of the piston plate. Both ends of the drive shaft pass through the piston cavities on both sides and are fixedly connected to a turntable. The other end of the push-pull rod is rotatably connected to the side wall of the turntable.

[0008] As a preferred embodiment of the present invention, a linkage chamber is fixedly connected to the top of the measuring cylinder, the rotating ring is in contact with the inner wall of the sealing chamber, the linkage chamber is connected to the sealing chamber, a linkage shaft is rotatably connected inside the linkage chamber, a drive gear and a pneumatic impeller are fixedly connected to the linkage shaft respectively, a toothed groove is provided on the outer wall of the rotating ring, the drive gear is meshed with the toothed groove, exhaust pipes are fixed and connected to both sides of the bottom of the air storage chamber, the output ends of the two sets of exhaust pipes are connected to the linkage chamber cavity located above the pneumatic impeller, the output ends of the two sets of exhaust pipes are symmetrically arranged along the center of the linkage shaft, and a solenoid valve is provided in both sets of exhaust pipes.

[0009] As a preferred technical solution of the present invention, the driving gear is a half gear, and only one-third arc length of tooth groove is opened on the outer wall of the rotating ring, that is, when the driving gear rotates, it can only drive the rotating ring to rotate clockwise or counterclockwise by 0-60 degrees.

[0010] As a preferred embodiment of the present invention, the base is provided with an air blowing groove, the bottom of the air blowing groove is provided with multiple sets of air blowing holes facing different directions, the top two sides of the air blowing groove are fixed and connected with air blowing pipes, and the other end of the air blowing pipes is connected to the bottom of the inner cavity of the sealed chamber.

[0011] As a preferred embodiment of the present invention, the detection unit includes a sample retention chamber, which is fixedly connected to the side wall of the gas storage chamber. A detection cylinder is fixedly connected to the top of the sample retention chamber. A turbidity meter is fixedly connected to the bottom of the inner cavity of the detection cylinder. Limiting rings are fixedly connected to the upper and lower parts of the inner wall of the detection cylinder. A buoyancy ring is slidably connected to the inner wall of the detection cylinder between the two sets of limiting rings. A sampling tube is fixedly connected to the bottom of the detection cylinder. An air extraction tube is fixedly connected to the top of the detection cylinder. The other end of the air extraction tube is connected to the inner cavity of the piston chamber, and a one-way valve is provided inside the air extraction tube.

[0012] As a preferred embodiment of the present invention, the upper part of the side wall of the detection cylinder is fixed and connected to a vent pipe, and a solenoid valve is provided inside the vent pipe. A contact electrode is provided at the bottom of the upper limiting ring, and the contact electrode is electrically connected to the solenoid valve inside the vent pipe.

[0013] As a preferred embodiment of the present invention, a sample retention tray is rotatably connected inside the sample retention chamber, and a servo motor is fixedly connected to the top of the sample retention chamber. The output shaft of the servo motor passes through the sample retention chamber and is fixedly connected to the top of the sample retention tray. The servo motor is electrically connected to the contact electrode. Multiple sets of sample retention slots are equally spaced inside the sample retention tray. The bottom of each set of sample retention slots is fixed and connected to a sampling tube. The sample retention chamber and the detection cylinder are connected through a guide hole. An emptying slot is provided in the sample retention tray between two adjacent sets of sample retention slots, and the bottom of the sample retention slot is designed in a funnel shape.

[0014] As a preferred embodiment of the present invention, measuring rods are fixedly connected to both sides of the base, and the buoyancy plate is slidably sleeved between the two sets of measuring rods.

[0015] Compared with the prior art, the present invention provides a water flow measurement device for precision irrigation based on a high-sediment conveying canal, which has the following beneficial effects: 1. This precision irrigation water flow measurement device based on a high-sediment conveying canal improves energy efficiency through the combination of water flow thrust and drive motor, and drives the water impeller to rotate. With the arrangement of turntable, push-pull rod and piston plate, air is continuously stored in the air storage chamber. Finally, the air flow thrust drives the rotating ring to rotate intermittently in the forward and reverse directions, realizing the adjustment of the Doppler current meter measurement position, so as to obtain measurement data from multiple points, so as to compare and correct the measurement results, thereby improving the final measurement accuracy.

[0016] 2. This precision irrigation water flow measurement device based on a high-sediment conveying canal uses the suction force generated by the sliding of a piston plate within the piston chamber to draw water from the canal into a detection cylinder for sediment content detection. Combined with a sample tray and trough, water samples are retained for subsequent verification. Furthermore, after each test, the water sample in the detection cylinder can be emptied, and a new sample can be drawn, enabling multiple tests and sample retention to ensure the accuracy of the detection.

[0017] 3. This precision irrigation water flow measurement device based on a high-sediment water conveyance channel uses airflow filled into the linkage chamber to be guided into the air blowing groove along the air blowing pipe, and finally discharged to the bottom of the water conveyance channel through the air blowing hole. This blows up the sediment deposited at the bottom of the water conveyance channel, and the water flow carries away the sediment, preventing sediment from accumulating around the base and clogging the water conveyance channel or corroding the base. This ensures the flow effect of the water conveyance channel and improves the service life of the base.

[0018] 4. This precision irrigation water flow measurement device based on a high sediment conveying canal uses a buoyancy plate and a scissor frame to adjust the measuring cylinder to be close to the middle of the water flow in the canal, thereby ensuring that the water flow in the measuring cylinder is close to the average flow velocity and thus improving the accuracy of the measurement results. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0020] Figure 1 This is a first-view three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the second-view three-dimensional structure of the present invention; Figure 3 This is a partial cross-sectional structural diagram of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram of region A in the middle; Figure 5 This is a schematic diagram of the sample tray structure of the present invention; Figure 6 This is a side view half-section diagram of the structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of region B in the middle; Figure 8 For the present invention Figure 6 Enlarged structural diagram of region C in the middle; Figure 9 This is a schematic diagram of the internal structure of the gas storage chamber of the present invention; Figure 10 This is a schematic diagram of the internal structure of the sealed chamber of the present invention.

[0021] In the diagram: 1. Base; 2. Buoyancy plate; 21. Scissor frame; 3. Measuring cylinder; 31. Mounting frame; 32. Telescopic rod; 33. Sealing chamber; 34. Rotating ring; 341. Toothed groove; 35. Doppler current meter; 4. Air storage chamber; 41. Drive shaft; 411. Turntable; 42. Hydrodynamic impeller; 43. Drive motor; 431. Pulley assembly; 44. Air storage chamber; 441. Air storage pipe; 442. Exhaust pipe; 45. Piston chamber; 451. Piston plate; 452. Push-pull rod; 5. 51. Linkage chamber; 52. Linkage shaft; 53. Drive gear; 54. Pneumatic impeller; 6. Air blowing groove; 65. Air blowing hole; 66. Air blowing pipe; 77. Sample retention chamber; 78. Detection cylinder; 79. Turbidity meter; 70. Limiting ring; 71. Contact electrode; 70. Buoyancy ring; 71. Sampling tube; 72. Air extraction pipe; 73. Vent pipe; 74. Sample retention tray; 75. Sample retention groove; 76. Sampling tube; 77. Sampling tube; 78. Guide hole; 79. Drainage groove; 80. Servo motor; 91. Measuring rod. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example: Reference Figures 1-10 A precision irrigation water flow measurement device based on a high-sediment conveying canal includes a base 1, which is fixedly connected to the bottom of the conveying canal. It also includes a buoyancy plate 2, with a scissor frame 21 rotatably connected between the buoyancy plate 2 and both sides of the base 1; a measuring cylinder 3; a mounting frame 31 rotatably connected to the side wall of the hinge point in the middle of the scissor frame 21; and telescopic rods 32 fixedly connected to both sides of the measuring cylinder 3, with the telescopic ends of the telescopic rods 32 fixed to the mounting frame 31. A sealed chamber 33 is provided inside the measuring cylinder 3. A rotating ring 34 is rotatably connected inside the 33. Two sets of Doppler current meters 35 are symmetrically installed on the inner wall of the rotating ring 34. The Doppler current meters 35 adopt existing mature technology and are used to measure the flow velocity of high sediment flow. The specific model can be HXH03-1. An air storage unit is provided on the buoyancy plate 2 to drive the rotating ring 34 to rotate intermittently. There are two detection units, which are installed on both sides of the buoyancy plate 2 respectively. The detection units are used to detect the sediment content in the water conveyance channel and to take samples for storage.

[0024] With the above-described structure, the buoyancy plate 2 floats on the water surface, and the scissor bracket 21 allows the measuring cylinder 3 to automatically adjust to be close to the middle of the water flow in the water conveyance channel. This ensures that the water flowing through the measuring cylinder 3 approaches the average flow velocity, thereby improving the accuracy of the measurement results. After the water flows through the measuring cylinder 3, the flow velocity of the sediment-laden water can be measured using a Doppler current meter 35. Furthermore, with the air storage unit, the measurement position of the Doppler current meter 35 can be intermittently changed to obtain measurement data from multiple points for comparison and correction. Additionally, the detection unit intermittently measures the sediment content of the water flow while measuring the flow velocity and retains the water sample for subsequent verification, thus ensuring the accuracy of the detection.

[0025] Reference Figure 3 , Figure 4 and Figure 9 The air storage unit includes an air storage chamber 4, which is fixedly connected to the top of the buoyancy plate 2. A drive shaft 41 is rotatably connected between the inner walls of both sides of the air storage chamber 4. A water impeller 42 is fixedly connected to the outer wall of the drive shaft 41. A drive motor 43 is fixedly connected to the top of one side of the air storage chamber 4. The drive motor 43 and the drive shaft 41 are connected by a pulley set 431. An air storage chamber 44 and two sets of piston chambers 45 are respectively opened in the air storage chamber 4. The piston chambers 45 and the air storage chambers 44 are connected by an air storage pipe 441, and a one-way valve is installed in the air storage pipe 441. A piston plate 451 is slidably connected in the piston chamber 45. A push-pull rod 452 is rotatably connected to the side wall of the piston plate 451. The two sides of the drive shaft 41 are connected by a push-pull rod 452. The ends of the push-pull rod 452 are respectively inserted into the piston chambers 45 on both sides and fixedly connected to the turntable 411. The other end of the push-pull rod 452 is rotatably connected to the side wall of the turntable 411. The detection part includes a sample retention chamber 7, which is fixedly connected to the side wall of the gas storage chamber 4. A detection cylinder 71 is fixedly connected to the top of the sample retention chamber 7. A turbidity meter 72 is fixedly connected to the bottom of the inner cavity of the detection cylinder 71. The turbidity meter 72 adopts existing mature technology and is used to detect the sediment content in the water flow. The specific model can be OBS-5+. A sampling tube 75 is fixedly connected to the bottom of the detection cylinder 71. An air extraction pipe 76 is fixedly connected to the top of the detection cylinder 71. The other end of the air extraction pipe 76 is connected to the inner cavity of the piston chamber 45, and a one-way valve is installed in the air extraction pipe 76.

[0026] With the above-described structure, the bottom area of ​​the water impeller 42 is submerged in the water flow. The thrust of the water flow drives the water impeller 42 and drive shaft 41 to rotate. Drive shaft 41 then synchronously drives the turntables 411 at both ends to rotate. Combined with the push-pull rod 452, the piston plate 451 slides back and forth within the piston chamber 45. When the piston plate 451 slides towards the gas storage chamber 44, it compresses the gas within the piston chamber 45 and opens the one-way valve in the gas storage pipe 441, allowing the compressed gas to enter the gas storage chamber 44 for energy storage. When the piston plate 451 slides in the opposite direction, it generates a negative pressure suction force within the piston chamber 45, opening the suction pipe 76. A one-way valve draws airflow from the detection cylinder 71 into the piston chamber 45, creating a negative pressure state inside the detection cylinder 71. At this time, water from the irrigation canal flows into the detection cylinder 71 along the sampling tube 75. The turbidity (i.e., sediment content) of the water flow is measured using the turbidity meter 72. Then, based on the known sediment flow velocity and cross-sectional area, the total sediment flow, pure water flow, and total sediment content of the irrigation canal per unit time can be calculated, effectively improving measurement results and facilitating precise irrigation management. Furthermore, by utilizing the natural water flow thrust generated within the irrigation canal, the aforementioned sediment content detection and preliminary air storage are achieved, reducing energy consumption and improving energy efficiency.

[0027] In addition, when the thrust of the water flow is insufficient to drive the water impeller 42 and the drive shaft 41 to rotate, the drive motor 43 is turned on, and the drive shaft 41 continues to rotate by the transmission of the pulley group 431, and continues to fill the air storage chamber 44 with air in conjunction with the turntable 411, the push-pull rod 452 and the piston plate 451.

[0028] Reference Figure 6 , Figure 7 and Figure 10 The measuring cylinder 3 is fixedly connected to the top of the linkage chamber 5. The rotating ring 34 is in contact with the inner wall of the sealing chamber 33. The linkage chamber 5 is connected to the sealing chamber 33. The linkage shaft 51 is rotatably connected inside the linkage chamber 5. The drive gear 52 and the pneumatic impeller 53 are fixedly connected to the linkage shaft 51 respectively. The outer wall of the rotating ring 34 is provided with tooth grooves 341. The drive gear 52 is meshed with the tooth grooves 341. The bottom sides of the air storage chamber 44 are fixed and connected with exhaust pipes 442. The output ends of the two sets of exhaust pipes 442 are connected to the cavity of the linkage chamber 5 located above the pneumatic impeller 53. The output ends of the two sets of exhaust pipes 442 are symmetrically arranged along the center of the linkage shaft 51, and both sets of exhaust pipes 442 are provided with solenoid valves. The drive gear 52 is a half gear. The outer wall of the rotating ring 34 is only provided with tooth grooves 341 with a length of one-third arc. That is, when the drive gear 52 rotates, it can only drive the rotating ring 34 to rotate clockwise or counterclockwise by 0-60 degrees.

[0029] With the above structure, when the air pressure in the gas storage chamber 44 reaches the threshold, one of the exhaust pipes 442 is opened, allowing the high-pressure airflow to blow along the exhaust pipe 442 towards the pneumatic impeller 53 in the linkage chamber 5. This drives the linkage shaft 51 and the drive gear 52 to rotate. The meshing connection between the drive gear 52 and the tooth groove 341 causes the rotating ring 34 to rotate in the forward direction. After the next gas storage is completed, the other exhaust pipe 442 is opened, causing the rotating ring 34 to rotate in the reverse direction. In this way, the measurement position of the Doppler current meter 35 is adjusted intermittently during the measurement process to obtain measurement data from multiple points, so as to compare and correct the measurement results, thereby improving the final measurement accuracy.

[0030] In addition, the rotating ring 34 performs short-range reciprocating rotations within the range of 0-60 degrees, which ensures that the connecting wires of the two sets of Doppler current meters 35 will not be excessively tangled and will not have a large height difference. This avoids large errors in the measurement results of multiple points due to height differences, thereby ensuring the final measurement accuracy.

[0031] Reference Figure 6 , Figure 8 The base 1 has an air-blowing groove 6. The bottom of the air-blowing groove 6 has multiple sets of air-blowing holes 61 facing different directions. The top two sides of the air-blowing groove 6 are fixed and connected to air-blowing pipes 62. A one-way valve is installed in the air-blowing pipe 62. The other end of the air-blowing pipe 62 is connected to the bottom of the inner cavity of the sealing chamber 33.

[0032] It should be noted that the one-way valve in the air blowing pipe 62 can only allow the gas in the sealed chamber 33 to enter the air blowing groove 6.

[0033] With the above structure, the airflow that drives the pneumatic impeller 53 to rotate after entering the linkage chamber 5 will accumulate in the sealed chamber 33 and eventually open the one-way valve in the air blowing pipe 62, enter the air blowing groove 6, and then be discharged to the bottom of the water conveyance channel through the air blowing hole 61. This blows up the mud and sand deposited at the bottom of the water conveyance channel, and the mud and sand are then carried away by the water flow. This prevents the mud and sand from accumulating around the base 1, blocking the water conveyance channel and corroding the base 1, ensuring the flow effect of the water conveyance channel and improving the service life of the base 1.

[0034] Reference Figure 4 Limiting rings 73 are fixedly connected to the upper and lower parts of the inner wall of the detection cylinder 71. A buoyancy ring 74 is slidably connected to the inner wall of the detection cylinder 71 between the two sets of limiting rings 73. A vent pipe 77 is fixed and connected to the upper part of the side wall of the detection cylinder 71. A solenoid valve is installed in the vent pipe 77. A contact electrode 731 is installed at the bottom of the upper limiting ring 73. The contact electrode 731 is electrically connected to the solenoid valve in the vent pipe 77.

[0035] With the above-described structure, when the sediment-laden water flows into the detection cylinder 71, some of it will enter the sample retention tank 781 along the guide hole 783. As the sediment-laden water is continuously drawn into the detection cylinder 71, the buoyancy will push the buoyancy ring 74 to float upwards, eventually causing the top of the buoyancy ring 74 to contact the contact electrode 731. At this time, the solenoid valve in the vent pipe 77 is opened, allowing the upper cavity of the detection cylinder 71 to be directly connected to the outside. The negative pressure inside the detection cylinder 71 will disappear. Under the gravity of the sediment-laden water, the sediment-laden water entering the detection cylinder 71 will automatically flow back into the water supply channel along the sampling pipe 75, so as to replace water samples at different times and achieve the retention of different water samples, thus ensuring the final detection accuracy.

[0036] Reference Figure 4 , Figure 5 A sample retention plate 78 is rotatably connected inside the sample retention chamber 7. A servo motor 79 is fixedly connected to the top of the sample retention chamber 7. The output shaft of the servo motor 79 passes through the sample retention chamber 7 and is fixedly connected to the top of the sample retention plate 78. The servo motor 79 is electrically connected to the contact electrode 731. Multiple sets of sample retention slots 781 are equally spaced inside the sample retention plate 78. The bottom of each set of sample retention slots 781 is fixed and connected to a sampling tube 782. The sample retention chamber 7 and the detection cylinder 71 are connected through a guide hole 783. An emptying slot 784 is provided in the sample retention plate 78 between two adjacent sets of sample retention slots 781. The bottom of the sample retention slot 781 is designed in a funnel shape. The funnel shape design can more thoroughly empty the mud and water sample in the sample retention slot 781 after the sampling tube 782 is opened.

[0037] With the above-described structure, the top of the buoyancy ring 74 contacts the contact electrode 731, which activates the servo motor 79, causing it to rotate the sample tray 78. This connects the drain trough 784 with the guide hole 783, assisting in the rapid discharge of sediment and water, and also removing any residual sediment from the guide hole 783. This ensures the accuracy of subsequent sampling. Finally, after the water sample in the detection tube 71 is completely discharged, the new sample tray 781 will rotate to connect with the guide hole 783 for the next sampling operation. This allows for multiple measurements of sediment content during water flow measurement, and the retention of each water sample for subsequent verification, thus ensuring the accuracy of the detection.

[0038] Reference Figure 1 , Figure 2 Measuring rods 8 are fixedly connected to both sides of the base 1, and the buoyancy plate 2 is slidably sleeved between the two sets of measuring rods 8. The cross-sectional area of ​​the water flow can be calculated by using the readings of the measuring rods 8 and the known cross-sectional area of ​​the water conveyance channel. At the same time, the two sets of measuring rods 8 can limit the buoyancy plate 2, so that the buoyancy plate 2 can only maintain vertical movement, thereby ensuring that the measuring cylinder 3 is close to the middle of the water flow in the water conveyance channel.

[0039] In addition, the electrical automation control and data transmission and recording parts mentioned above all use existing mature technologies, and their specific principles will not be elaborated here.

[0040] Reference Figures 1-10 In this invention, during use, the base 1 is fixed to the bottom of the water conveyance channel. Then, the pump station operates and conveys high-sediment water through the water conveyance channel. When the water flow in the water conveyance channel becomes relatively calm, the water flow measurement begins. At this time, the buoyancy plate 2 floats on the water surface, and the scissor frame 21 ensures that the measuring cylinder 3 is close to the middle of the water flow in the water conveyance channel, thus ensuring that the water flow through the measuring cylinder 3 is close to the average flow velocity, thereby improving the accuracy of the measurement results. After the water flows through the measuring cylinder 3, the flow velocity of the sediment water can be measured using the Doppler current meter 35. Furthermore, the cross-sectional area of ​​the water flow at this time can be calculated using the reading of the measuring rod 8 and the known cross-sectional area of ​​the water conveyance channel.

[0041] Meanwhile, the bottom area of ​​the water impeller 42 is submerged in the water flow. The thrust of the water flow drives the water impeller 42 and drive shaft 41 to rotate, which in turn drives the turntables 411 at both ends to rotate. Combined with the push-pull rod 452, this causes the piston plate 451 to slide back and forth within the piston chamber 45. When the piston plate 451 slides towards the gas storage chamber 44, it compresses the gas within the piston chamber 45 and opens the one-way valve in the gas storage pipe 441, allowing the compressed gas to enter the gas storage chamber 44 for energy storage. When the piston plate 451 slides in the opposite direction, it generates a negative pressure suction force within the piston chamber 45, opening the one-way valve in the suction pipe 76. The airflow inside the detection cylinder 71 is drawn into the piston chamber 45, and the detection cylinder 71 will then be in a negative pressure state. At this time, the water flow in the water conveyance channel will enter the detection cylinder 71 along the sampling tube 75. By setting the turbidity meter 72, the turbidity of the water flow (i.e., the sediment content) at this time is measured. Then, based on the known sediment flow velocity and water flow cross-sectional area, the total sediment flow, the total pure water flow, and the total sediment content of the water conveyance channel per unit time can be calculated, which effectively improves the measurement effect and facilitates precise irrigation management. Furthermore, by utilizing the natural water flow thrust generated in the water conveyance channel, the above-mentioned sediment content detection and preliminary gas storage work are realized, reducing energy consumption and improving energy-saving effect.

[0042] As gas continuously accumulates in the gas storage chamber 44, when the thrust of the water flow is insufficient to drive the water impeller 42 and drive shaft 41 to rotate, the drive motor 43 is turned on. Utilizing the transmission action of the pulley assembly 431, the drive shaft 41 continues to rotate. This, along with the turntable 411, push-pull rod 452, and piston plate 451, continues to fill the gas storage chamber 44 with gas. When the gas pressure in the gas storage chamber 44 reaches a threshold, one of the exhaust pipes 442 is opened, allowing the high-pressure airflow to blow along the exhaust pipe 442 into the linkage chamber 5. The pneumatic impeller 53 drives the linkage shaft 51 and the drive gear 52 to rotate. The drive gear 52 meshes with the tooth groove 341, causing the rotating ring 34 to rotate in the forward direction. After the next air accumulation is completed, the exhaust pipe 442 on the other side is opened, causing the rotating ring 34 to rotate in the reverse direction. In this way, the measurement position of the Doppler current meter 35 is adjusted intermittently during the measurement process to obtain measurement data from multiple points, so as to compare and correct the measurement results, thereby improving the final measurement accuracy.

[0043] In addition, the airflow that enters the linkage chamber 5 and drives the pneumatic impeller 53 to rotate will accumulate in the sealed chamber 33 and eventually open the one-way valve in the air blowing pipe 62, enter the air blowing groove 6, and then be discharged to the bottom of the water conveying channel through the air blowing hole 61. This blows up the mud and sand deposited at the bottom of the water conveying channel, and the water flow carries away the mud and sand, preventing the mud and sand from accumulating around the base 1 and causing blockage of the water conveying channel and corrosion of the base 1. This ensures the flow effect of the water conveying channel and improves the service life of the base 1.

[0044] In addition, when the mud and sand flow into the detection cylinder 71, some of it will enter the sample retention tank 781 along the guide hole 783. As the mud and sand flow is continuously drawn into the detection cylinder 71, the buoyancy will push the buoyancy ring 74 to float up, and eventually the top of the buoyancy ring 74 will touch the contact electrode 731. At this time, the solenoid valve and servo motor 79 in the vent pipe 77 will be opened simultaneously. When the solenoid valve is opened, the upper cavity of the detection cylinder 71 is directly connected to the outside, and the negative pressure inside the detection cylinder 71 will disappear. At this time, under the gravity of the sediment flow, the sediment flow entering the detection cylinder 71 will automatically flow back into the water supply channel along the sampling pipe 75. When the servo motor 79 is turned on, it will drive the sample retention plate 78 to rotate, so that the drain trough 784 is connected to the guide hole 783, thereby assisting the rapid discharge of sediment flow and also discharging the residual part in the guide hole 783, thus ensuring the accuracy of subsequent sampling. Finally, when the water sample in the detection cylinder 71 is completely discharged, the new sample retention trough 781 will rotate to the connection point with the guide hole 783 for the next sampling operation. In this way, multiple sediment content measurements can be achieved during the water flow measurement process, and samples can be retained for each test for subsequent inspection, thereby ensuring the accuracy of the test.

[0045] Components not described in detail in this article are existing technologies.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water flow measurement device for precision irrigation based on a high-sediment conveying canal, comprising a base (1) fixedly connected to the bottom of the conveying canal, characterized in that, Also includes: A buoyancy plate (2) is rotatably connected to both sides of the base (1) by a scissor frame (21). The measuring cylinder (3) has a mounting bracket (31) rotatably connected to the side wall of the hinge point in the middle of the scissor frame (21). Telescopic rods (32) are fixedly connected to both sides of the measuring cylinder (3), and the telescopic ends of the telescopic rods (32) are fixed to the mounting brackets (31). The measuring cylinder (3) is provided with a sealed chamber (33), and a rotating ring (34) is rotatably connected inside the sealed chamber (33). Two sets of Doppler current meters (35) are symmetrically installed on the inner wall of the rotating ring (34), and an air storage part is provided on the buoyancy plate (2) to drive the rotating ring (34) to rotate intermittently. The detection unit is provided in two sets and is installed on both sides of the buoyancy plate (2). The detection unit is used to detect the silt content in the water conveyance channel and to take samples for storage.

2. The water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 1, characterized in that, The gas storage unit includes a gas storage chamber (4), which is fixedly connected to the top of the buoyancy plate (2). A drive shaft (41) is rotatably connected between the inner walls of the two sides of the gas storage chamber (4). A water impeller (42) is fixedly connected to the outer wall of the drive shaft (41). A drive motor (43) is fixedly connected to the top of one side of the gas storage chamber (4). The drive motor (43) and the drive shaft (41) are connected by a pulley group (431).

3. The water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 2, characterized in that, The gas storage chamber (4) is provided with a gas storage chamber (44) and two sets of piston chambers (45). The piston chambers (45) and the gas storage chambers (44) are connected by a gas storage pipe (441). A one-way valve is provided in the gas storage pipe (441). A piston plate (451) is slidably connected in the piston chamber (45). A push-pull rod (452) is rotatably connected to the side wall of the piston plate (451). The two ends of the drive shaft (41) pass through the piston chambers (45) on both sides and are fixedly connected to a turntable (411). The other end of the push-pull rod (452) is rotatably connected to the side wall of the turntable (411).

4. The water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 3, characterized in that, The measuring cylinder (3) is fixedly connected to the top of the linkage chamber (5). The rotating ring (34) is in contact with the inner wall of the sealing chamber (33). The linkage chamber (5) is connected to the sealing chamber (33). The linkage chamber (5) is rotatably connected to the linkage shaft (51). The linkage shaft (51) is fixedly connected to the drive gear (52) and the pneumatic impeller (53). The outer wall of the rotating ring (34) is provided with tooth grooves (341). The drive gear (52) is meshed with the tooth grooves (341). The bottom sides of the air storage chamber (44) are fixed and connected to exhaust pipes (442). The output ends of the two sets of exhaust pipes (442) are connected to the cavity of the linkage chamber (5) located above the pneumatic impeller (53). The output ends of the two sets of exhaust pipes (442) are symmetrically arranged along the center of the linkage shaft (51). The two sets of exhaust pipes (442) are provided with solenoid valves.

5. A water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 4, characterized in that, The drive gear (52) is a half gear, and the outer wall of the rotating ring (34) is provided with tooth grooves (341) with a length of one-third arc. That is, when the drive gear (52) rotates, it can only drive the rotating ring (34) to rotate clockwise or counterclockwise by 0-60 degrees.

6. The water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 4, characterized in that, The base (1) has an air blowing groove (6) inside. The bottom of the air blowing groove (6) has multiple sets of air blowing holes (61) facing different directions. The top two sides of the air blowing groove (6) are fixed and connected to air blowing pipes (62). The other end of the air blowing pipes (62) is connected to the bottom of the inner cavity of the sealing chamber (33).

7. A water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 3, characterized in that, The detection unit includes a sample retention chamber (7), which is fixedly connected to the side wall of the gas storage chamber (4). A detection cylinder (71) is fixedly connected to the top of the sample retention chamber (7). A turbidity meter (72) is fixedly connected to the bottom of the inner cavity of the detection cylinder (71). Limiting rings (73) are fixedly connected to the upper and lower parts of the inner wall of the detection cylinder (71). A buoyancy ring (74) is slidably connected to the inner wall of the detection cylinder (71) between the two sets of limiting rings (73). A sampling tube (75) is fixedly connected to the bottom of the detection cylinder (71). A suction pipe (76) is fixedly connected to the top of the detection cylinder (71). The other end of the suction pipe (76) is connected to the inner cavity of the piston chamber (45). A one-way valve is provided in the suction pipe (76).

8. A water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 7, characterized in that, The upper side wall of the detection cylinder (71) is fixed and connected to a vent pipe (77), and a solenoid valve is installed inside the vent pipe (77). The upper limiting ring (73) has a contact electrode (731) at its bottom, and the contact electrode (731) is electrically connected to the solenoid valve in the vent pipe (77).

9. A water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 8, characterized in that, A sample retention tray (78) is rotatably connected inside the sample retention chamber (7). A servo motor (79) is fixedly connected to the top of the sample retention chamber (7). The output shaft of the servo motor (79) passes through the sample retention chamber (7) and is fixedly connected to the top of the sample retention tray (78). The servo motor (79) is electrically connected to the contact electrode (731). Multiple sets of sample retention slots (781) are equally spaced inside the sample retention tray (78). The bottom of each set of sample retention slots (781) is fixed and connected to a sampling tube (782). The sample retention chamber (7) and the detection cylinder (71) are connected through a guide hole (783). Among them, the sample tray (78) between two adjacent sample trays (781) is provided with an emptying groove (784), and the bottom of the sample tray (781) is designed in a funnel shape.

10. A water flow measurement device for precision irrigation based on a high-sediment conveying canal according to claim 1, characterized in that, Measuring rods (8) are fixedly connected to both sides of the base (1), and the buoyancy plate (2) is slidably sleeved between the two sets of measuring rods (8).

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