CN110700192A - Constant-flow water discharge weir and initial state setting method thereof - Google Patents
Constant-flow water discharge weir and initial state setting method thereof Download PDFInfo
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- CN110700192A CN110700192A CN201911120333.7A CN201911120333A CN110700192A CN 110700192 A CN110700192 A CN 110700192A CN 201911120333 A CN201911120333 A CN 201911120333A CN 110700192 A CN110700192 A CN 110700192A
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Abstract
The invention provides a constant-flow water drain weir and an initial state setting method thereof, and relates to the technical field of water level control facilities. The synchronous moving device comprises a floating ball connecting rod and a weir plate connecting rod which are respectively connected with a floating ball and a weir plate and are vertically arranged, the floating ball connecting rod and the weir plate connecting rod are respectively and pivotally connected with a driving lever and a driven lever, the driving lever and the driven lever are pivotally connected to two ends of a vertically arranged middle connecting rod, and the driving lever and the driven lever are both equal-arm levers. The problem of among the prior art manger plate facility of draining be difficult to guarantee that the water flow process 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.
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 method has high requirements on the downstream flow process in application scenes 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, and has the problems of unbalanced supply and demand, lagged water level information behind the adjustment requirement, difficult real-time adjustment and the like in the application of water replenishing facilities.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a constant-flow water drain weir, which solves the problem that a water retaining and draining facility in the prior art is difficult to ensure the constant outlet water flow.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the weir plate is connected to the floating ball through the synchronous moving device, and the floating ball is arranged in the wave stabilizing box.
The synchronous moving device comprises a floating ball connecting rod and a weir plate connecting rod which are respectively connected with a floating ball and a weir plate and are vertically arranged, the floating ball connecting rod and the weir plate connecting rod are respectively and pivotally connected with a driving lever and a driven lever, the driving lever and the driven lever are pivotally connected to two ends of a vertically arranged middle connecting rod, and the driving lever and the driven lever are both equal-arm levers.
Further, the middle parts of the driving lever and the driven lever are respectively provided with a first fulcrum pin and a second fulcrum pin in a rotating mode. The first fulcrum pin and the second fulcrum pin are respectively lever fulcrums of the driving lever and the driven lever.
Furthermore, an equal-arm holding mechanism is arranged on the driven lever and comprises a horizontal guide rail for a second fulcrum pin to be inserted and horizontally slide, a first spring is arranged between the second fulcrum pin and the middle connecting rod, a second spring is arranged between the second fulcrum pin and the weir plate connecting rod, and the elastic modulus of the first spring is equal to that of the second spring.
The driven lever rotates around the second fulcrum pin under the traction effect of the driving lever, in order to keep the power arm of the driven lever equal to the resistance arm all the time, the second fulcrum pin is pushed to move by the force generated after the first spring and the second spring are stretched or compressed, and therefore the moving displacement of the floating ball in the vertical direction is guaranteed to be equal to the moving displacement of the weir plate in the vertical direction all the time.
Furthermore, a first sliding groove for the second fulcrum pin to move relatively along the length direction of the driven lever is formed in the driven lever, and a second sliding groove for the weir plate connecting rod to move relatively along the length direction of the driven lever is formed in the driven lever. The first sliding groove provides a sliding space for the movement of the second fulcrum pin and plans a sliding track, and the second sliding groove provides a sliding space for the movement of the joint of the weir plate connecting rod and the driven lever and plans a sliding track.
Furthermore, the floating ball connecting rod is a telescopic rod. The distance between the active lever and the water surface when the initial state is changed by adjusting the length of the telescopic rod, so that the height of the weir plate is better adapted, the precision requirement on the synchronous moving device in the machining process is reduced, the machining and assembling difficulty is reduced, and the construction efficiency and the working effect are favorably improved.
Furthermore, the bottom end of the middle connecting rod is hung with a balancing weight. The middle connecting rod is kept vertical under the action of gravity of the balancing weight.
Further, 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 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.
Furthermore, the communicating part is in a round platform shape, the wind blocking part is in a cylindrical shape, the communicating part and the wind blocking part are both hollow, and the inner diameter of the wind blocking part is larger than the maximum overall dimension of the floating ball, so that the floating ball can be placed on the water surface floating in the wave stabilizing box from the open top end of the wind blocking part and can move up and down along with the height of the liquid level in the wave stabilizing box.
Further, the base sets up in the both ends 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, so that the moving distance of the weir plate is closer to the changing distance of the water level, and the constant precision of the water outlet flow is improved.
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 method for setting the initial state of the constant-flow water discharging weir 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: selecting the type of the weir plate, and obtaining the number, the structural size and the set position of the weir plate upper weir crest according to the required weir plate upper water head value H;
s3: according to the maximum value S of perennial water level change of the water area where the constant-current water discharging weir is installedmaxObtaining the height S of the weir plate1And the depth S of the rectangular groove in the base2Let S1>2S2,S2>Smax；
S4: calculating the load q on the weir, and checking whether the weir plate meets the process requirements or not according to the value of the q;
s5: selecting a floating ball according to the total weight of the weir plate and the synchronous moving device, and determining the size of the wave stabilizing box according to the overall size of the floating ball;
s6: the installation constant current weir of releasing is placed the stationary wave box in 3 ~ 5H departments in the weir plate upper reaches, and the length of adjustment floater link, and then the height of adjustment weir plate makes the weir head at this moment equal H, accomplishes the initial condition of releasing the weir and sets for.
Further, the specific method for determining the required weir crest value H according to the required water flow rate Q in step S1 includes:
according to the formula
Q＝1.4H2.5......................................(1)
The 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, then adopting another formula
Q＝1.343H2.47......................................(2)
Calculating the obtained H value;
and if H is 0.021-0.300 m, adopting the average value of H calculated by the formulas (1) and (2).
The invention has the beneficial effects that: the floating ball positioned in water is connected with the weir plate through the synchronous moving device, so that the weir plate can be driven by the synchronous moving device to automatically adjust the height according to the change of the water level, and then the weir water head is adjusted to ensure the constancy of the water discharge flow. The constant-flow water drain weir can be automatically adjusted after the initial state is adjusted, manual intervention is not needed, and the labor cost in the use process is reduced.
The synchronous moving device has the advantages of simple structure, low manufacturing and mounting cost, easy maintenance and replacement, reliable transmission, simple motion analysis process and easy calculation, higher adjustment precision of the water discharge flow and reduced error rate.
The floating ball is positioned in the wave stabilizing box, so that the influence of natural environment factors such as wind speed and the like on the water level can be reduced, and the reliability and the accuracy of the action of the weir plate are improved.
Drawings
FIG. 1 is a schematic structural view of a constant-current weir.
Fig. 2 is a schematic structural view of the follower lever of fig. 1.
Fig. 3 is a top view of the base and weir plate assembly.
Fig. 4 is a cross-sectional view taken at a-a in fig. 3.
Fig. 5 is a cross-sectional view at B-B in fig. 3.
Wherein, 1, a base; 11. a rectangular groove; 12. a roller; 2. a weir plate; 3. a synchronous moving device; 31. a floating ball connecting rod; 32. a weir plate connecting rod; 33. an active lever; 331. a first fulcrum pin; 34. a driven lever; 341. a second fulcrum pin; 35. a middle connecting rod; 36. an equal arm holding mechanism; 361. a horizontal guide rail; 362. a first spring; 363. a second spring; 364. a first chute; 365. a second chute; 4. a floating ball; 5. a wave stabilizing box; 51. a communicating portion; 511. a communicating hole; 52. 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.
As shown in fig. 1, the constant-flow water discharging weir comprises a weir plate 2 slidably arranged in a base 1, the weir plate 2 is connected to a floating ball 4 through a synchronous moving device 3, and the floating ball 4 is arranged in a wave stabilizing box 5.
The synchronous moving device 3 comprises a floating ball connecting rod 31 and a weir plate connecting rod 32 which are respectively connected with the floating ball 4 and the weir plate 2 and are vertically arranged, the floating ball connecting rod 31 and the weir plate connecting rod 32 are respectively and pivotally connected with a driving lever 33 and a driven lever 34, the driving lever 33 and the driven lever 34 are pivotally connected with two ends of a vertically arranged middle connecting rod 35, and the driving lever 33 and the driven lever 34 are both equal-arm levers.
The floating ball connecting rod 31 is a telescopic rod, the floating ball connecting rod 31 is preferably a telescopic three-section sliding rail and comprises an outer rail, a middle rail and an inner rail, and the three parts are mutually clamped and can relatively slide. The floating ball 4 is fixed at the bottom end of the inner rail, and the active lever 33 is pivotally connected with the top end of the outer rail.
The top ends of the floating ball connecting rod 31 and the weir plate connecting rod 32 are fixedly connected with pivots, and through holes with inner diameters larger than the outer diameters of the pivots are formed in the driving lever 33 and the driven lever 34 and are used for being sleeved with the corresponding pivots, so that the driving lever 33 and the driven lever 34 can rotate relative to the corresponding pivots. Pivots are also fixed at two ends of the middle connecting rod 35, one end of the driving lever 33, which is far away from the floating ball connecting rod 31, is rotatably sleeved on the pivot at the upper end of the middle connecting rod 35, and one end of the driven lever 34, which is far away from the weir plate connecting rod 32, is rotatably sleeved on the pivot at the lower end of the middle connecting rod 35. In order to keep the middle connecting rod 35 vertical all the time, a balancing weight is hung on the middle connecting rod, and the middle connecting rod is kept vertical under the traction action of the driving lever 33 and the driven lever 34 through the gravity of the balancing weight.
The middle portions of the driving lever 33 and the driven lever 34 are rotatably provided with a first fulcrum pin 331 and a second fulcrum pin 341, respectively. The first fulcrum pin 331 is fixed on the fixing plate, the fixing plate is stationary relative to the ground, and the driving lever 33 is rotatably sleeved on the first fulcrum pin 331. When the floating ball 4 rises (falls), one end of the power arm of the driving lever 33 is driven to rise (fall), and the resistance arm of the driving lever 33 falls (rise).
The driven lever 34 is provided with an equal arm holding mechanism 36, and the equal arm holding mechanism 36 includes a horizontal guide rail 361 into which the second fulcrum pin 341 is inserted and which horizontally slides, and the horizontal guide rail 361 is fixed to a fixed plate which is stationary with respect to the ground. A first spring 362 is provided between the second fulcrum pin 341 and the intermediate link 35, and a second spring 363 is provided between the second fulcrum pin 341 and the slice link 32.
As shown in fig. 2, the driven lever 34 is provided with a first slide groove 364 for allowing the second fulcrum pin 341 to relatively move along the longitudinal direction of the driven lever 34, and the driven lever 34 is provided with a second slide groove 365 for allowing the end of the slice link 32 to be pivotally inserted and relatively move along the longitudinal direction of the driven lever 34. The first sliding chute 364 and the second sliding chute 365 are rectangular grooves formed in the driven lever 34, the groove width of the first sliding chute 364 is equal to the diameter of the second fulcrum pin 341, the groove width of the second sliding chute 365 is equal to the diameter of the end pivot of the weir plate connecting rod 32, one end of the second fulcrum pin 341 and one end of the weir plate connecting rod 32, which are inserted into the corresponding sliding chutes, are fixedly connected with end plates for preventing the end plates from being separated, and the diameter of each end plate is larger than the groove width of the corresponding sliding chute.
The floating ball 4 is put into the inner cavity of the wave stabilizing box 5 from the top end of the wave stabilizing box 5. The wave-stabilizing box 5 comprises a communicating part 51 placed in water and a wind shield part 52 positioned on the water surface, wherein the top surface of the wind shield part 52 is opened, and a communicating hole 511 for water to flow in is arranged on the side wall of the communicating part 51. The communicating portion 51 is circular truncated cone-shaped, the wind blocking portion 52 is cylindrical, the communicating portion 51 and the wind blocking portion 52 are both hollow, and the inner diameter of the wind blocking portion 52 is larger than the maximum outer dimension of the float ball 4.
The inside of the wave stabilizing box 5 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 52, 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 distance L between the placing position of the wave stabilizing box 5 and the upstream wall surface of the weir is (3-5) H, the water surface does not obviously descend before the weir at the moment, and the weir water head can be better determined.
The traditional water discharge flow error source:
(1) wind speed, and water level fluctuation caused by wind speed are the most important part of factors influencing the water discharge flow.
(2) The water level information lags behind regulatory requirements, which can cause an imbalance in water supply and demand over a period of time.
Error analysis, wind speed vs. wave height is given in the following table:
TABLE 1
The influence of external wind speed on water surface fluctuation is shown in the table, the water surface change can directly cause the flow change, taking 2-level wind as an example, the average wave height caused by the change is 0.2 meter, and when the water head H on the weir is set to be 0.4 meter, the calculation formula Q is H2.5The actual output flow rate is QPractice of＝1.4(H+ΔH)2.5Namely, the parameters are as follows:
TABLE 2
The flow Q set by the device is 0.1467m 3/s;
the actual flow range Q is (0.025-0.3904) m 3/s;
the outflow error range △ Q is (-0.1166-0.2487) m 3/s;
the error range is related to the wind speed and is the most important factor for influencing the constant flow. The influence of the wind speed on the error caused by the fluctuation of the water surface can be greatly reduced through the wave stabilizing box. Still can add the flow straightener through a certain position in this device upper reaches, the whole poroid filter screen that is of flow straightener, and wave kinetic energy is eliminated on the one hand, and on the other hand also enables rivers and normally pass through. The purpose is to eliminate the influence of wind speed on the water level before the weir, keep the water level before the weir constant, supplement with the wave stabilization box, and make the water level before the weir not influenced by external wind.
As shown in fig. 3 and 4, the base 1 is arranged at two ends 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, rollers 12 are arranged between three surfaces of the rectangular groove 11 and the weir plate 2, the rollers 12 are rotatably connected to the base 1, the three surfaces of the weir plate 2 and the rectangular groove 11 are in roller surface contact through the rollers 12, and the sliding friction between the weir plate 2 and the rectangular groove 11 is converted into rolling friction through the rollers 12.
The weir plate 2 is a thin-wall weir, and the thin-wall weir can be divided into a rectangular thin-wall weir, a triangular thin-wall weir, a trapezoidal thin-wall weir, a proportional thin-wall weir and the like according to the shape of a weir crest, wherein the rectangular thin-wall weir and the right-angled triangular thin-wall weir are most commonly used. For the measurement precision, when the measured flow is the same, the triangular thin-wall weir has a larger water head than the rectangular thin-wall weir, so the measurement precision is higher than that of the rectangular thin-wall weir, especially the measurement precision of small flow can be greatly improved, and the right-angled triangular thin-wall weir is preferred in the embodiment. 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 formula has the following application range: the upstream weir height P1 is more than or equal to 2H, and the weir width B is more than or equal to (3-4) H.
The weir water head H is invariable, can guarantee that the flow Q that drains is invariable, and the difference in height between water level and the weir crest bottom on the weir plate 2 is weir water head H promptly.
The float ball 4 rises or falls with the change of the water level, so that the float ball connecting rod 31 rises or falls, and the driving lever 33 is driven to move in an arc shape around the first fulcrum pin 331. Because the middle connecting rod 35 is vertical all the time under the effect of the balancing weight, in the water level fluctuation process, the resistance arm of the driving lever 33 drives the driven lever 34 to rotate, the second chute 365 on the driven lever 34 and the weir plate connecting rod 32 can generate the trend of relative sliding, namely, the driven lever 34 can generate oblique movement in the rotating process around the second fulcrum pin 341, the first spring 364 and the second spring 365 are driven to deform, the second fulcrum pin 341 slides in the horizontal guide rail 361 and the first chute 364 due to the deformation extrusion or stretching action of the springs, and further the second fulcrum pin 341 is always at the midpoint of the driven lever 34, and the driven lever 34 is always an equal-arm lever. According to the equal triangle principle, the ascending and descending distance of the weir plate 2 is consistent with that of the floating ball.
The basis of keeping the moving distance of the weir plate 2 and the floating ball 4 equal is that the middle connecting rod 35 is always kept vertical, a heavy object is suspended below the middle connecting rod 35, meanwhile, the driven lever 34 must be set as a sliding lever to meet the horizontal displacement brought by the lever connection position when the driving lever 33 rotates, so that the driven lever 34 can slide obliquely in the rotating process, the horizontal position of the second fulcrum pin 341 in the adjusting process and the position of the second fulcrum pin 341 in the driven lever 34 change along with the fluctuation of the water surface (the position of the second fulcrum pin 341 is ensured to be always centered), and the driven lever 34 is ensured to be always an equal-arm lever through the two changes.
When the water level descends, one side of the driven lever 34 far away from the weir plate ascends, meanwhile, the driven lever 34 is pressed to slide upwards along the second sliding groove 365 in a relatively inclined mode, the adjusting rod portion of the driven lever 34 is shortened, two springs inside the driven lever are pressed to drive the second fulcrum pin 341 to slide in the first sliding groove 364, meanwhile, the second fulcrum pin 341 passively slides in the horizontal guide rail 361, the elastic modulus of the springs is equal, the compression amount of the springs is equal, namely the second fulcrum pin is always in the middle position of the adjusting portion of the driven lever, and the horizontal position of the second fulcrum pin is moved rightwards in the horizontal guide rail 361 relative to the initial stage, so that the driven lever 34 is always kept to be an equi.
The initial state setting method of the constant-flow water discharging weir 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: the method comprises the following steps of selecting a weir plate type, obtaining the number and the structural size of weir notches on the weir plate and setting positions on the weir plate according to a required weir crest value H, wherein the specific method comprises the following steps:
the method comprises the following steps that the type of a weir plate is selected to be a right-angle triangular weir, 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;
in order to control the water discharge amount through the weir crest on the weir plate, so that the water surface can not be higher than the top end of the weir crest, judging whether the arrangement of one weir crest can meet the condition that 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。
S3: according to the maximum value S of perennial water level change at the water area of the constant-flow drainage weirmaxObtaining the height S of the weir plate1And the depth S of the rectangular groove in the base2Let S1>2S2,S2>SmaxAnd the adjusting range of the weir plate can meet the changing range of the water level.
S4: calculating the load q on the weir, and checking whether the weir plate meets the process requirements or not according to the value of the q, wherein the specific method comprises the following steps:
according to the formula
q＝0.5*Q/(Hi*i)
HiThe weir water head on a single weir crest, i is the number of weir crests,
judging whether q satisfies q is less than or equal to 2.9L/(m & s),
and if not, adjusting the number of the weirs and the structural size of the weirs, and repeating the calculation until the requirements are met.
S5: selecting a floating ball according to the total weight of the weir plate and the synchronous moving device, wherein the floating ball is preferably a hollow ball made of stainless steel, and the buoyancy force borne by the floating ball can support the total weight of the weir plate and the synchronous moving device; and the size of the wave stabilizing box is determined according to the overall dimension of the floating ball, and the inner diameter of the wind shielding part of the wave stabilizing box is larger than the outer diameter of the floating ball, so that the floating ball can be directly placed into the wave stabilizing box from the top end of the wind shielding part and floats on the water surface in the wave stabilizing box.
S6: installing a constant-current water discharge weir according to the figure 1, placing a wave stabilization box at the position 3-5H of the upper stream of the weir plate, adjusting the wave stabilization box to the length of a floating ball connecting rod 31 of a telescopic rod after the installation is finished, and further achieving the purpose of adjusting the height of the weir plate until the water head on the weir on each weir crest is equal to HiThe sum of the water discharge flow in all the weir ports is equal to the required water flow Q at the downstream of the water discharge weir, namely the initial state setting of the water discharge weir is completed, the water level rises or falls along with the time, the height of the weir plate can be automatically adjusted under the regulation of running the water discharge weir, the sum of the water discharge flow in all the weir ports is always the same as the initial state, and the purpose of constant-flow water discharge is achieved.
Claims (10)
1. The constant-flow water discharge weir is characterized by comprising a weir plate (2) arranged in a base (1) in a sliding manner, wherein the weir plate (2) is connected to a floating ball (4) through a synchronous moving device (3), and the floating ball (4) is arranged in a wave stabilizing box (5);
the synchronous moving device (3) comprises a floating ball connecting rod (31) and a weir plate connecting rod (32) which are respectively connected with the floating ball (4) and the weir plate (2) and are vertically arranged, the floating ball connecting rod (31) and the weir plate connecting rod (32) are respectively in pivot connection with a driving lever (33) and a driven lever (34), the driving lever (33) and the driven lever (34) are in pivot connection with two ends of a middle connecting rod (35) which is vertically arranged, and the driving lever (33) and the driven lever (34) are equiarm levers.
2. A constant-flow weir according to claim 1, wherein the middle parts of the driving lever (33) and the driven lever (34) are respectively and rotatably provided with a first fulcrum pin (331) and a second fulcrum pin (341).
3. A constant-flow weir according to claim 2, wherein the driven lever (34) is provided with an equal-arm holding mechanism (36), the equal-arm holding mechanism (36) comprises a horizontal guide rail (361) for the second fulcrum pin (341) to insert and horizontally slide, a first spring (362) is arranged between the second fulcrum pin (341) and the intermediate link (35), a second spring (363) is arranged between the second fulcrum pin (341) and the weir plate link (32), and the elastic modulus of the first spring (362) is equal to that of the second spring (363).
4. The constant-current weir according to claim 3, wherein the driven lever (34) is provided with a first sliding groove (364) for the second fulcrum pin (341) to relatively move along the length direction of the driven lever (34), and the driven lever (34) is provided with a second sliding groove (365) for the weir plate connecting rod (32) to relatively move along the length direction of the driven lever (34).
5. A constant-flow weir as claimed in claim 1, wherein the floating ball connecting rod (31) is a telescopic rod.
6. A constant-flow weir as claimed in claim 1, wherein a counterweight is hung from the bottom end of the intermediate connecting rod (35).
7. The constant-current water weir according to claim 1, wherein the wave stabilizing box (5) comprises a communicating part (51) placed in the water and a wind shielding part (52) positioned on the water surface, the top surface of the wind shielding part (52) is open, and a communicating hole (511) for water to flow in is arranged on the side wall of the communicating part (51).
8. The constant-flow water discharge weir according to claim 1, wherein the base (1) is arranged at two ends of the weir plate (2), the base (1) is provided with a rectangular groove (11) for the weir plate (2) to insert and vertically slide, and a roller (12) is arranged between the rectangular groove (11) and the weir plate (2).
9. A method for setting an initial state of a constant-current weir according to any one of claims 1 to 8, comprising the steps of:
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: selecting the type of the weir plate, and obtaining the number, the structural size and the set position of the weir plate upper weir crest according to the required weir plate upper water head value H;
s3: according to the maximum value S of perennial water level change of the water area where the constant-current water discharging weir is installedmaxObtaining the height S of the weir plate1And the depth S of the rectangular groove in the base2Let S1>2S2,S2>Smax；
S4: calculating the load q on the weir, and checking whether the weir plate meets the process requirements or not according to the value of the q;
s5: selecting a floating ball according to the total weight of the weir plate and the synchronous moving device, and determining the size of the wave stabilizing box according to the overall size of the floating ball;
s6: the installation constant current weir of releasing, place the steady wave box in 3 ~ 5H departments in the weir plate upper reaches, the length of adjustment floater link, and then the height of adjustment weir plate makes the weir head at this moment equal H, accomplishes the settlement of the weir initial condition that releases.
10. The method for setting the initial state of the constant-flow weir of claim 9, wherein the specific method for determining the required weir waterhead H according to the required water flow Q in step S1 is as follows:
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;
if H is 0.021-0.300 m, the formula Q is 1.4H2.5And Q ═ 1.343H2.47Average of calculated H.
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