CN110820697A - Constant-flow water discharging weir based on automatic control and constant-flow water discharging method thereof - Google Patents
Constant-flow water discharging weir based on automatic control and constant-flow water discharging method thereof Download PDFInfo
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- CN110820697A CN110820697A CN201911121652.XA CN201911121652A CN110820697A CN 110820697 A CN110820697 A CN 110820697A CN 201911121652 A CN201911121652 A CN 201911121652A CN 110820697 A CN110820697 A CN 110820697A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/20—Movable barrages; Lock or dry-dock gates
- E02B7/205—Barrages controlled by the variations of the water level; automatically functioning barrages
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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Abstract
The invention provides a constant-flow water discharging weir based on automatic control and a constant-flow water discharging method thereof, which relate to the technical field of water level control facilities and comprise a weir plate arranged in a base in a sliding manner, wherein a lifting device and a displacement sensor are connected onto the weir plate, the lifting device is driven by a motor, the motor and the displacement sensor are electrically connected onto a controller, and a water level signal collector is electrically connected onto the controller; the lifting device comprises a rack vertically fixed on the weir plate and a gear meshed with the rack, and the gear is driven to rotate by a motor. The problem of among the prior art manger plate facility of draining be difficult to guarantee that the water flow is invariable is solved.
Description
Technical Field
The invention relates to the technical field of water level control facilities, in particular to a constant-flow water drain weir based on automatic control.
Background
Common manger plate facility of draining among the prior art is mostly artifical or mechanical weir plate, and according to the required water yield requirement of upstream water yield and low reaches, adopt mechanical equipment to roughly adjust the weir plate aperture, the flow that the control drains, the in-process that drains, the process of effluenting is undulant along with the incoming flow process, is difficult to guarantee the invariant of flow process. The problems that supply and demand are unbalanced, water level information lags behind regulation requirements, real-time regulation is difficult and the like exist in application scenes with high requirements on a downstream flow process, such as urban landscape water systems, scenic spot water networks, large-area beach water replenishing and salt washing, farmland irrigation, sewage discharge and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a constant-flow water drain weir based on automatic control, which solves the problem that the water retaining and draining facility in the prior art is difficult to ensure the constant water outlet flow.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the constant-flow water drain weir based on automatic control comprises a weir plate arranged in a base in a sliding manner, wherein the weir plate is connected with a lifting device and a displacement sensor, the lifting device is driven by a motor, the motor and the displacement sensor are electrically connected to a controller, the controller is electrically connected with a water level signal collector, and a collection point of the water level signal collector is positioned in a wave stabilizing box; the lifting device comprises a rack vertically fixed on the weir plate and a gear meshed with the rack, and the gear is driven to rotate by a motor.
Further, the water level signal collector is an ultrasonic water level meter. The ultrasonic water level meter is not in contact with the water surface, is arranged right above the water surface, has no requirement on water quality, is extremely easy to install and maintain, has accurate measurement data, and can improve the accuracy and the service life of the constant-flow water discharge weir.
Furthermore, the water level signal collector is fixed above the water level to be detected through a support frame, and a solar power supply box for supplying power to the water level signal collector is fixed on the support frame. The solar water level signal collector is self-sufficient in supplying power to the water level signal collector, the storage battery does not need to be replaced manually and periodically, and the manual maintenance cost is reduced.
Furthermore, the supporting frame is also provided with a wind speed and direction sensor which is electrically connected to the controller. The influence of wind on the water level is eliminated through the wind speed and direction sensor, so that the misjudgment of the controller is caused.
Furthermore, the wave stabilization box comprises a communicating part arranged in water and a wind shielding part positioned on the water surface, the top surface of the wind shielding part is open and positioned below the water level signal collector, and a communicating hole for water to flow into is formed in the side wall of the communicating part. Water outside the communicating part is introduced into the inner cavity through the communicating hole to form a communicating device, so that the water level inside the communicating part is consistent with the water level outside the communicating part, the wind shielding part provides a barrier for the water inside the communicating part, water surface fluctuation caused by natural environments such as wind speed and the like is reduced, misoperation on the weir plate is reduced, and reliability is improved.
Further, a wireless communication module is arranged between the water level signal collector and the controller. The water level signal collected by the water level signal collector is transmitted to the controller through the wireless communication module, and the requirement on the space layout between the controller and the water level signal is reduced.
Furthermore, the acquisition frequency of the water level signal acquisition device is 1-50 times/second.
Furthermore, the frequency of the motor action controlled by the controller is 5-10 minutes/time.
Further, the base sets up in the both sides of weir plate, is provided with on the base and supplies the weir plate to insert and vertical gliding rectangular channel, is provided with the gyro wheel between rectangular channel and the weir plate. The friction between the base and the weir plate is reduced through the rollers, and the transmission efficiency is improved.
Further, one side of the weir plate penetrates through the base and is fixedly connected with the rack.
Further, the weir plate is a thin-wall weir. The thin-wall weir is a weir with the ratio of the thickness of the weir top to the water head on the weir being less than 0.67, the weir top wall of the thin-wall weir is in contact with the water flow passing the weir only by a side line, the water flow is not affected, the relation between the water head and the flow is stable, and the influence of the weir plate on the water flow in the up-and-down sliding process is reduced.
The constant-flow water discharging method of the constant-flow water discharging weir based on automatic control comprises the following steps:
s1: determining a water head value H on the required weir according to the required water flow Q at the downstream of the water discharging weir;
s2: calculating to obtain the initial position L of the weir plate according to the type of the selected weir plate and the required weir crest value H0；
S3: installing a constant-flow water drain weir based on automatic control, placing a wave stabilizing box at the position 3-5H above a weir plate, and enabling the weir plate to be positioned at L0A location;
s4: monitoring the current water level in front of the weir in the wave stabilizing box in real time through a water level signal collector, and transmitting the current water level to a controller;
s5: on the controller side, adjusting control parameters of the controller according to the received current water level in front of the weir, and controlling the lifting device to drive the weir plate to move up and down through the controller;
s6: in the moving process of the weir plate up and down, the displacement of the weir plate is collected in real time through the displacement sensor and fed back to the controller, and whether the displacement of the weir plate reaches the target displacement is judged through the controller, so that the current weir water head is always kept at a constant set value.
Further, the method for eliminating the influence of the wind speed on the water level in the method comprises the following steps:
real-time monitoring of the real-time wind direction and the wind speed is realized through a wind speed and wind direction sensor, the wind speed is V, and the wind direction theta is an included angle between the wind direction and the outflow direction of the weir, namely the outflow direction component velocity V1Obtaining the grade of the outlet air according to V1 when the outlet air is V cos theta, and further inquiring the corresponding wave height H wave, namely the weir upper compensation water head is HWave ofThe conversion coefficient is k, and the weir outflow is corrected to
Further, the initial position L of the slice is obtained in the above step S20The method comprises the following steps:
the vertical height d of the weir on the weir plate is obtained according to the selected type of weir plate,
judging whether a weir crest can satisfy H < d,
if not, set 2 weirs for judgment, Q ═ Sigma (Q)1+Q2)，H1＝H2<d
If not, the number of the weirs is continuously increased until the weir water head H on a single weiri<d，
Subtracting H from the water level when the weir plate is setiNamely obtaining the position of the weir crest bottom, and obtaining the initial position L of the weir plate through the position of the weir crest bottom0。
The invention has the beneficial effects that: the water level signal collector collects water level information in real time, the water level information is fed back to the controller, and the motor is controlled to act after the water level information is processed and judged by the controller. When the motor rotates forwards, the gear drives the rack to move upwards to move the weir plate, and when the motor rotates backwards, the weir plate is driven to descend, so that the weir water head is adjusted, the water outlet flow is controlled, and the water outlet flow is kept constant.
The displacement sensor can feed the displacement of the weir plate back to the controller in real time, so that the controller can acquire the displacement of the weir plate moved in real time, the phenomenon that the weir plate is moved excessively or not enough is avoided, and the precision of moving the weir plate is improved.
The rotation of the motor is converted into the movement of the weir plate in the vertical direction by adopting a transmission mode that a gear drives a rack between the motor and the weir plate, and the rack-and-pinion transmission has larger bearing capacity and can improve the transmission reliability; the transmission speed of the gear rack is high, the transmission ratio can be accurately controlled, and the control difficulty of the controller is reduced.
Drawings
FIG. 1 is a circuit connection block diagram of a controller of a constant-flow water discharging weir based on automatic control.
Fig. 2 is a top view of the base and weir plate assembly.
Fig. 3 is a cross-sectional view taken at a-a in fig. 2.
Fig. 4 is a cross-sectional view at B-B in fig. 2.
Fig. 5 is an installation schematic diagram of a water level signal collector.
Wherein, 1, a base; 11. a rectangular groove; 12. a roller; 2. a weir plate; 3. a gear; 4. a rack; 5. a water level signal collector; 51. an ultrasonic water level gauge; 52. a support frame; 53. a solar power supply box; 531. a solar panel; 6. a displacement sensor; 7. a wave stabilizing box; 71. a communicating portion; 711. a communicating hole; 72. a wind shield part.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
The constant-current water discharging weir based on automatic control comprises a weir plate 2 arranged in a base 1 in a sliding mode, wherein a lifting device and a displacement sensor are connected to the weir plate 2, the lifting device is driven by a motor, as shown in figure 1, the motor and the displacement sensor are electrically connected to a controller, a water level signal collector 5 is electrically connected to the controller, and a collecting point of the water level signal collector is located in a wave stabilizing box 7; the lifting device comprises a rack 4 vertically fixed on the weir plate 2 and a gear 3 meshed with the rack 4, and the gear 3 is driven to rotate by a motor.
The wave stabilizing box 7 includes a communicating portion 71 placed in the water and a wind shielding portion 72 located on the water surface, the top surface of the wind shielding portion 72 is opened, and a communicating hole 711 into which water flows is provided on the side wall of the communicating portion 71. The communicating portion 71 is circular truncated cone-shaped, the windshield portion 72 is cylindrical, and both the communicating portion 71 and the windshield portion 72 are hollow.
The inside of the wave stabilizing box 7 forms a communicating vessel with the external water body, so that the heights of the internal liquid surface and the external liquid surface are the same. The instantaneous influence of external wind on the fluctuation of the water surface is eliminated to the greatest extent through the wind shielding effect of the wind shielding part 72, the water level inside the wave stabilizing box is kept constant, namely, the weir water head is kept stable, and the error is reduced to the greatest extent.
The working principle of the invention is as follows: gather water level signal through water level signal collector in real time, the height of water level promptly, and after the signal analog/digital conversion that will gather, transmit to the controller apart from water level signal collector certain distance through wireless communication module, the water level change value that will gather turns into needs motor pivoted revolution through the controller, and transmit for the motor through digital-analog conversion with digital signal's form output, the motor receives the signal and rotates, it rises or descends to drive rack 4 through gear 3, thereby drive weir plate 2 and rise or descend. The controller is arranged in a control chamber, the control chamber is positioned on the shore beside the weir plate 2, and the motor is arranged beside the weir plate 2 and draws out alternating current from the control chamber to drive the motor to rotate.
The present invention will be described in further detail with reference to specific examples.
Example 1
A constant-flow water drain weir based on automatic control comprises a weir plate 2 arranged in a base 1 in a sliding mode, wherein the weir plate 2 is a plate-shaped part for intercepting water or controlling water flow, the weir plate 2 is usually made of PVC (polyvinyl chloride), glass fiber reinforced plastics or stainless steel, and can bear a large water area by increasing the wall thickness.
The weir plate 2 is connected with a lifting device and a displacement sensor, and the displacement sensor is preferably MPS-M-1500 MM-P-AB. The lifting device is driven by a motor, the motor and the displacement sensor are electrically connected to a controller, and the controller is electrically connected with a water level signal collector 5. The displacement sensor collects the movement displacement of the weir plate 2 and transmits the movement displacement to the controller so as to facilitate the controller to carry out the next action, and if the displacement of the weir plate 2 is equal to the variation of the water level, the operation of the motor is stopped; if the displacement of the weir plate 2 is larger than the variation of the water level, controlling the motor to rotate reversely and simultaneously detecting by the displacement sensor until the displacement is equal to the variation of the water level; if the displacement of the weir plate 2 is less than the variation of the water level, the motor is controlled to continue to actively move until the displacement is equal to the variation of the water level
The lifting device is characterized in that the rotary motion of a motor is converted into reciprocating linear motion in the vertical direction of the weir plate 2, in the mechanical field, the lifting device capable of achieving the function generally comprises a bidirectional screw mechanism, a slider-crank mechanism, a worm gear mechanism and a rack-and-pinion transmission mechanism, the weir plate 2 is located in water, a control chamber is generally arranged on land beside the weir plate for convenience in control, and the rack-and-pinion transmission mechanism is selected as the lifting device in the embodiment in consideration of space layout, implementation possibility and convenience.
The lifting device comprises a rack 4 vertically fixed on the weir plate 2 and a gear 3 meshed with the rack 4, and the gear 3 is driven to rotate by a motor. Usually, the motor has a high rotation speed, and a speed reducer is connected between the motor and the gear 3 to reduce the rotation speed of the motor.
Example 2
The embodiment is further optimized based on embodiment 1, and the water level signal collector 5 is an ultrasonic water level meter, preferably an ultrasonic water level meter of the type YDZ-YL9 series. The series of ultrasonic water level meters adopt a digital signal processing technology, have high precision, can accurately detect the change of the water level, have wide coverage range of the generated ultrasonic beam, can avoid misoperation caused by the local water level change caused by water waves caused by natural environment, have strong anti-interference capability and are suitable for complex measuring environment.
Example 3
In this embodiment, further optimization is performed based on embodiment 2, as shown in fig. 5, the water level signal collector 5 is fixed above the water level to be measured through a support frame 52, a solar power supply box 53 for supplying power to the water level signal collector 5 is fixed on the support frame, and the solar power supply box 53 is connected with a solar panel 531 fixed on the support frame 52. And the bottom end of the support frame is provided with a wind speed and wind direction sensor, preferably a 360-degree wind speed sensor with the model of RS485 digital.
Solar power generation device and battery are installed in solar power box 53, and solar panel 531 gathers the sunlight, converts solar energy into electric energy through solar power generation device and stores in the battery, and the battery is used for supplying power for ultrasonic wave water level gauge 51.
A space for placing a spare battery is left in the solar power supply box 53 for supplying power to the ultrasonic water level gauge 51 by manually placing the charged battery when solar energy is insufficient, so as to ensure continuous operation of the ultrasonic water level gauge 51.
Example 4
The embodiment is further optimized based on embodiment 1 or 2, and a wireless communication module is arranged between the water level signal collector and the controller. The water level signal collected by the water level signal collector is transmitted to the controller through the wireless communication module, and the requirement on the space layout between the controller and the water level signal is reduced. The controller adopts STM32 type singlechip, and wireless communication module is one or more in the WIFI module GPRS module, and STM32 type singlechip is an embedded singlechip, and is with low costs, satisfies the design demand.
Example 5
The embodiment is further optimized based on embodiment 1, the acquisition frequency of the water level signal acquisition device is 1-50 times/second, the real-time performance of the acquired signals can be guaranteed, and power consumption waste caused by too frequent signal acquisition is avoided. The frequency of the controller controlling the motor to act is 5-10 minutes/time. Avoid the unnecessary loss that the too frequent action of motor arouses, reduce life.
Example 6
The embodiment is further optimized based on embodiment 1, as shown in fig. 2 to 4, the base 1 is disposed on two sides of the weir plate 2, the base 1 is provided with a rectangular groove 11 for the weir plate 2 to be inserted and vertically slide, and a roller 12 is disposed between the rectangular groove 11 and the weir plate 2. The base 1 is only arranged on two sides of the weir plate 2, so that the material and installation difficulty of the base 1 are reduced. The rectangular groove 11 is used for limiting the weir plate 2. The roller 12 is rotatably connected to the base 1, the surfaces of the weir plate 2 opposite to the rectangular grooves 11 are in contact with the roller surface of the roller 12, sliding friction between the weir plate 2 and the rectangular grooves 11 is converted into rolling friction through the roller 12, and transmission efficiency is improved.
Example 7
The present embodiment is further optimized based on embodiment 6, as shown in fig. 4, one side of the weir plate 2 passes through the base 1 and is fixedly connected with the rack 4. The rack 4 and the gear 3 are connected outside the base 1, so that the motor and the displacement sensor can be conveniently installed and observed in the whole transmission process, and the overhaul and the maintenance are convenient.
Example 8
The weir plate 2 is a thin-wall weir. The thin-wall weir is a weir with the ratio of the thickness of the weir top to the water head on the weir being less than 0.67, the weir top wall of the thin-wall weir is in contact with the water flow passing the weir only by a side line, the water flow is not affected, the relation between the water head and the flow is stable, and the influence of the weir plate 2 on the water flow in the up-and-down sliding process is reduced.
The weir plate 2 in this embodiment is preferably a right angle triangular thin walled weir. As shown in fig. 5, a notch with a right-angled triangle cross section is formed at the top end of the weir plate 2. The flow calculation formula of the right-angle triangular thin-wall weir is as follows:
Q＝1.4H2.5
in the formula, Q is the flow, and H is the weir head.
The water head H on the weir is constant, and the constant water discharge flow Q can be ensured.
When the weir plate 2 adopts a right-angle triangular weir, the constant-flow water discharging method of the constant-flow water discharging weir based on automatic control comprises the following steps:
s1: determining a required weir upper water head value H according to the required water flow Q at the downstream of the water discharging weir, wherein the specific calculation method comprises the following steps:
according to the formula Q ═ 1.4H2.5The H value is obtained by calculation,
if H is 0.021-0.200 m, adopting the H value;
if H is 0.301-0.350 m, the formula Q is 1.343H2.47Calculating the obtained H value;
and if H is 0.021-0.300 m, calculating the average value of H by adopting the two formulas.
S2: according to the structural characteristics of the right-angle triangular weir, the included angle between two slope surfaces of a weir crest of the right-angle triangular weir is 90 degrees, and the relationship that a is 2d exists between the vertical height d of the weir crest and the maximum width a of the top end of the weir crest;
judging whether a weir crest can satisfy H < d,
if not, set 2 weirs for judgment, Q ═ Sigma (Q)1+Q2)，H1＝H2<d
If not, the number of the weirs is continuously increased until the number of the weirs is H on a single weiri<d，
H on each weir crestiAre all equal to HiThe height of the water surface and the bottom of the weir crestThe ends are fixed in position on the weir plate 2, a certain HiThe initial position L of one weir plate 2 can be uniquely obtained0。
S3: installing a constant-flow water drain weir based on automatic control, connecting the top end of a wave stabilizing box to a support frame for installing an ultrasonic water level meter through a rod piece, providing a wind-blowing-free barrier for the water level below the ultrasonic water level meter by the wave stabilizing box, wherein the inner diameter of the wave stabilizing box is larger than the detection range of the ultrasonic water level meter, and placing the wave stabilizing box at the upstream 3-5H of a weir plate;
the motor is started manually, the gear 3 is driven to rotate by the motor, and the weir plate 2 is adjusted to the initial position L0To (3).
S4: monitoring the current water level in front of the weir in the wave stabilizing box in real time through an ultrasonic water level meter, and transmitting the current water level to a controller;
s5: on the controller side, comparing the received water level before the weir with the initial water level value to obtain a water level change value, and if the water level change value is a positive number, controlling the lifting device to drive the weir plate to move upwards for the change distance of the water level; if the change value of the water level is negative, the lifting device is controlled to drive the weir plate to move downwards for the change distance of the water level.
When the water level rises, the weir crest value is larger than the set value, the controller is required to control the motor to drive the gear 3 to rotate clockwise (in the direction shown in fig. 4), so that the weir plate 2 moves upwards, and meanwhile, the displacement sensor collects the displacement of the weir plate 2 in real time until the moving distance of the weir plate 2 is equal to the rising distance of the water level, so that the current weir crest always keeps a constant set value, and the constant water discharge flow is further ensured;
when the water level descends, the weir head value is smaller than the set value, the controller is needed to control the motor to drive the gear 3 to rotate anticlockwise (in the direction shown in fig. 4), so that the weir plate 2 moves downwards, meanwhile, the displacement sensor collects the displacement of the weir plate 2 in real time until the moving distance of the weir plate 2 is equal to the descending distance of the water level, the current weir head is always kept at the constant set value, and the constant of the water discharge flow is further ensured.
The method for eliminating the influence of the wind speed on the water level in the method comprises the following steps:
wind direction by wind speedThe sensor monitors the real-time wind direction and wind speed in real time, the wind speed is V, the wind direction theta is the included angle between the wind direction and the outflow direction of the weir, namely the outflow direction component velocity V1Obtaining the grade of outlet air according to V1, and inquiring the corresponding wave height H wave, namely the weir upper compensation water head is HWave ofThe conversion coefficient is k, and the weir outflow is corrected to
This weir operation in-process of draining monitors external signal according to ultrasonic wave fluviograph and wind speed wind direction sensor, and then transmits the controller, and the control room is undulant and wind direction wind speed condition output signal according to the weir front water level, and then control step motor rotates, maintains the flow and is invariable.
Claims (10)
1. A constant-flow water drain weir based on automatic control is characterized by comprising a weir plate arranged in a base in a sliding manner, wherein the weir plate is connected with a lifting device and a displacement sensor, the lifting device is driven by a motor, the motor and the displacement sensor are electrically connected to a controller, the controller is electrically connected with a water level signal collector, and a collection point of the water level signal collector is positioned in a wave stabilizing box;
the lifting device comprises a rack vertically fixed on the weir plate and a gear meshed with the rack, and the gear is driven to rotate by the motor.
2. The constant-flow weir of claim 1, wherein the water level signal collector is an ultrasonic water level meter.
3. The constant-current water weir according to claim 2, wherein the water level signal collector is fixed above the water level to be measured by a support frame, and a solar power box for supplying power to the water level signal collector is fixed on the support frame.
4. The automatic control-based constant-flow weir of claim 3, wherein the supporting frame is further provided with an air speed and direction sensor, and the air speed and direction sensor is electrically connected to the controller.
5. The constant-flow water weir according to claim 2, wherein the wave stabilizing box comprises a communicating part placed in the water and a wind shielding part located on the water surface, the top surface of the wind shielding part is open and located below the water level signal collector, and a communicating hole for water to flow into is arranged on the side wall of the communicating part.
6. The constant-flow weir according to claim 1 or 2, wherein a wireless communication module is provided between the water level signal collector and the controller.
7. The automatic control-based constant-flow water weir according to claim 1, wherein the base is arranged on both sides of the weir plate, the base is provided with a rectangular groove for the weir plate to insert and vertically slide, and rollers are arranged between the rectangular groove and the weir plate.
8. A constant-flow water discharging method based on an automatic control constant-flow water discharging weir of any one of claims 1 to 7, which comprises the following steps:
s1: determining a water head value H on the required weir according to the required water flow Q at the downstream of the water discharge weir;
s2: calculating to obtain the initial position L of the weir plate according to the type of the selected weir plate and the required weir crest value H0；
S3: installing a constant-flow water drain weir based on automatic control, placing a wave stabilizing box at the position 3-5H above a weir plate, and enabling the weir plate to be positioned at L0A location;
s4: monitoring the current water level in front of the weir in the wave stabilizing box in real time through a water level signal collector, and transmitting the current water level to a controller;
s5: on the controller side, adjusting control parameters of the controller according to the received current water level in front of the weir, and controlling the lifting device to drive the weir plate to move up and down through the controller;
s6: in the moving process of the weir plate up and down, the displacement of the weir plate is collected in real time through the displacement sensor and fed back to the controller, and whether the displacement of the weir plate reaches the target displacement is judged through the controller, so that the current weir water head is always kept at a constant set value.
9. The constant-flow discharging method based on the automatic control constant-flow discharging weir of claim 8, wherein the method for eliminating the influence of wind speed on water level comprises the following steps:
real-time monitoring of the real-time wind direction and the wind speed is realized through a wind speed and wind direction sensor, the wind speed is V, and the wind direction theta is an included angle between the wind direction and the outflow direction of the weir, namely the outflow direction component velocity V1Obtaining the grade of outlet air according to V1, and inquiring the corresponding wave height H wave, namely the weir upper compensation water head is HWave ofThe conversion coefficient is k, and the weir outflow correction is Q1.4 (H + KH)Wave of)2.5。
10. The constant-flow discharging method for the automatic control-based constant-flow discharging weir of claim 8, wherein the step S2 is to obtain the initial position L of the weir plate0The method comprises the following steps:
the vertical height d of the weir on the weir plate is obtained according to the selected type of weir plate,
judging whether a weir crest can satisfy H < d,
if not, set 2 weirs for judgment, Q ═ Sigma (Q)1+Q2)，H1＝H2<d
If not, the number of the weirs is continuously increased until the weir water head H on a single weiri<d，
Subtracting H from the water level when the weir plate is setiNamely obtaining the position of the weir crest bottom, and obtaining the initial position L of the weir plate through the position of the weir crest bottom0。
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