JPH03224908A - Promptly responsing gate for flow regulation - Google Patents

Abstract

PURPOSE:To automatically control water-diversion and water-distribution, by arranging a water pond connected to an upperstream passage of a gate by an inflow inlet of with a small pass and floating a float detecting the level difference and interlocking the float with a responsing gate for regulating flow rate. CONSTITUTION:A room 25 of a water level detecting float is provided in a water pond 19 through a water conducting hole 25a, where the float 26 is floated. One end of the float 26 is connected to the wirerope 37 of the gate 12 and the other end is connected to a main roller 41 transferring along a main cam groove 46 provided at a main cam plate 46. And further, the pushing up roller of the main roller 41 and the main cam plate 46 are fitted with each other and a lever 49 interlocking the pushing up roller with the door body of gate 12 are slidably fitted. And the pushing up roller is interlocked with the detecting float 26 to transfer water. In this way, even if there is variation of water level, the difference can be kept constant.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is for distributing water in an irrigation canal, drainage canal, or dual-purpose canal for diversion or storage of water. This relates to a flow-response gate that operates according to the amount of water.

(Conventional technology) Conventionally, multiple gates have been installed on waterways branching from intake rivers for water use in various areas along the waterway, and these gates maintain a constant water level immediately upstream. A device with a mechanism was used (for example, Japanese Utility Model Publication No. 50-45816). However, since water use was managed individually for each gate, these gates did not operate in conjunction with the gates above and downstream of the gate, and the water level was maintained in order from the upstream gate. In the event of a flood, the increased water will be concentrated downstream.

In addition, when the water level of the drainage river rises during high tide, or river construction works block the flow at the downstream end of the canal, making drainage of the canal difficult, the water level on the downstream side of the canal will flow from the upstream side. The water level immediately upstream of the gate on the downstream side is no longer maintained as it rises due to running water.In this way, in the downstream area of the waterway, there was always a risk of water overflowing and causing flooding damage in the event of an abnormality.Also, in times of drought, When water is taken preferentially in the upstream area, the downstream water level is low (and the amount of usable water in the downstream area is considered to be small), and the downstream area has always suffered only damage. Therefore, maintaining the water level at a specific point at a constant level would push the flood damage further downstream, which would be extremely inconvenient from the perspective of the rationality of managing the waterway as a whole. From this point of view, the present inventors have already proposed in Japanese Patent Application No. 63-33421 that when it is unavoidable to raise the water level at the gate during a flood, or during a drought, We are proposing a gate equipped with a device that opens and closes so that the water level difference between each gate is maintained constant even when the water level becomes low.

An overview of the configuration of this gate will be explained with reference to FIGS. 8 and 9. A gate 2 is provided across a waterway 1, and a still water pond 3 connected to a waterway upstream of the gate 2 is provided with a gate 2 across the waterway 1. A water level difference detection float 4 is floated. Water from the water channel downstream of the gate 2 is introduced into the water level difference detection float 4 via a water conduit 4a connected to the lower end of the water level difference detection float 4, and a valve body 4b is attached to the water conduit 4a. ing. In addition, float chamber 2A installed adjacent to still water pond 3
A float 2a is floating on the surface. When the valve body 4b is in the upper position, upstream water flows into the float chamber 2A, while the inside of the float 2a is in the retarding pond 2 communicating with the downstream waterway.
B, and the water level in the float 2a approaches the downstream water level.

Furthermore, when the valve body 4b is in the lower position, the float chamber 2A communicates with the downstream waterway, the inside of the float 2a communicates with the still water pond 3, and also communicates with the retarding reservoir 2B through the small diameter opening. This allows water to flow into the float 2a. A helical spring 5 is attached to the upper end of the water level difference detection float 4.
One end is fixed. The other end of the helical spring 5 is connected to a roller 6a that moves along a cam groove formed in a cam plate 6 that is horizontally movable upward, and is suspended so as to be extendable and retractable. On the other hand, the gate 2 and the float 2a are connected to a stepless reducer 2b via a wire, and the stepless reducer 2b is connected to a cam plate 6 via a wire so that the cam plate 6 is displaced by the vertical movement of the gate 2. is being used.

Next, its effect will be explained. As the gate 2 opens, the cam plate 6 moves with an appropriate force depending on the opening degree of the gate 2, and the helical spring 5 is pulled with an appropriate strength, so that the water level difference between the upstream and downstream sides of the gate 2 increases. When the water level difference detection float 4 reaches a predetermined value depending on the opening degree, the water level difference detection float 4 becomes stable, the operation of the float stops, and the gate 2 maintains this state. The water level difference detection float 4 rises when the water level difference is too large, and descends when the water level difference becomes too small. The downstream water level difference is always kept constant. That is, when the water level difference becomes excessive, the water level difference detection float 4 floats, and the tension of the helical spring 5 decreases. Further, as the water level difference detection float 4 floats, the valve body 4b is placed in the upper position, and the float 2a rises. Then, although the cam plate 6 is slightly displaced, when the gate 2 is opened and the water level difference reaches the set value, the water level difference detection float 4 is lowered, the tension is balanced, and the gate 2 is stabilized. Therefore, if the water level at that point rises due to water usage being stopped downstream of the waterway, the gate 2 will be closed, and this will spread to the gates upstream one after another, causing the gates to be closed. Flood damage can be kept to a minimum.

(Problems to be Solved by the Invention) By the way, when constructing the waterway 1, a planned water level at each point is set in advance, and the gate 2 is designed and constructed based on this. Further, even after that, when opening and closing the gate 2, it is of course necessary to operate the gate 2 so as to maintain the planned water level as much as possible. Therefore, at all times when there is no abnormality, the purpose can be sufficiently achieved with the gate 2 having the above configuration.

However, in the above gate, the displacement movement of the cam plate 6 is uniquely determined, so if the water level fluctuates significantly for some reason, the gate first detects the water level difference and operates, causing the upstream water level to change. The water level difference will be maintained at the set level regardless of how it is done, and then the upstream and downstream gates will operate based on the fluctuating water level difference, and the gates will feed back to each other to balance out the water level difference across the waterway. In case of sudden floods, etc., it will not be possible in time. Therefore, in order to quickly operate the water level difference detection float 4, the stepless reducer 6a
It is necessary to manually reset the reduction ratio of This means that the country is unable to fully respond to floods and droughts, and it is not possible to eradicate the inequality between the upstream and downstream areas. Additionally, for this reason, assigning management personnel to water facilities requires personnel costs. In addition, even if the reduction ratio is reset, the displacement movement of the cam plate 6 is uniquely determined, and there is no correlation with the re-set reduction ratio when the water level returns, so there is a large error, and if the water level fluctuates greatly. If the water level is set to , the error will increase even more when the water level returns, resulting in inaccurate operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flow rate rapid response gate that can respond to sudden floods and droughts and has fewer errors.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a still water pond that communicates with the upstream waterway of a gate provided across the waterway through a small-diameter inlet. A water level difference detection float is floated in a water pond with its inside communicating with the downstream channel of the gate, one end of a wire rope is connected to the upper end of the water level difference detection float via a helical spring, and the other end of the wire rope is connected to the upper end of the water level difference detection float,
The main cam plate is connected to a main roller that moves along a cam groove formed in a main cam plate that is movable up and down, and engages the main cam plate with a push-up roller that moves along a rail groove that extends in the vertical direction. The push-up roller is slidably engaged with an operating arm of a lever provided to interlock with the door body of the gate, and further, the push-up roller is moved horizontally in conjunction with a water level detection float floating in the still water pond. It is characterized by the following.

In addition, the working arm of the lever is designed so that there is enough room for the lever to move.
When the gate is fully closed, the working arm is inclined upward at an appropriate angle.

(Function) With the above configuration, the push-up roller is moved horizontally by the water level detection float as the water depth (upstream water level) changes, and the operating arm of the lever expands and contracts in response to changes in the water level difference. The contact position between the main cam plate and the push-up roller is changed. Furthermore, when the lower end of the gate body is in line with the water surface (hereinafter referred to as the fully open state), the rise value is equal to the rise value of the main cam plate regardless of the water depth.

For example, when the depth of flowing water becomes smaller, the opening angle when the gate is fully open becomes smaller, but the contact position between the push-up roller and the lever changes depending on the water level, making it possible to increase the arm length of the lever. When the rising value of the main cam plate is held constant and the main cam plate is close to fully open, the operating speed of the lever that pushes up the main cam plate becomes faster, and qualitatively speaking, it becomes slower when the main cam plate is close to fully open. However, in general, quantitatively speaking, this effect is insufficient, but if the lever is tilted even in the fully closed state, the above effect will be further strengthened. If the angle of inclination of the lever when fully opened is selected appropriately, the main cam plate alone will move the main roller along the cam groove formed on the main cam plate, and depending on the position of the main roller, the winding will be adjusted according to the water depth and gate opening degree. The tension of the spring is obtained.As stated above, this tension depends on the water depth and water level, so the gate opening degree corresponding to the upstream and downstream water levels can be obtained.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 7.

As shown in FIG. 6, the constructed waterway 7 has its upstream end connected to the intake river 8, and its downstream end connected to the drainage side j9, with an intake gate IO and a drainage gate 1 at each boundary.
) is mediated. The waterway 7 has the functions of water utilization and drainage, and at major points, a planned water level for water utilization and a slightly higher planned water level for drainage are set. The downstream water level and the drainage gate 1) are configured to automatically open and close so that the upstream water level becomes the planned drainage level.

The gate 12 in the present invention is installed directly downstream of the water diversion point of the waterway 7, and may be omitted if the water diversion point is nearby, or can sense changes in the water level at the downstream water diversion point. If they are too far apart, they will be installed at appropriate intervals even if there is no diversion work. The planned water level immediately upstream of each gate 12 is set in advance, and the planned water level immediately upstream of each gate 12 is maintained.Moreover, if the planned water level cannot be maintained due to abnormal flooding or drought, The difference between the actual water level immediately upstream of each gate 12 and the planned water level 1 is made equal to ensure fairness between the upstream and downstream areas.

Next, the structure of the gate 12 will be explained based on FIGS. 1 to 5. As shown in FIG. 3, a mounting base 13 is installed above both walls of the waterway 7, and a main shaft 14 is rotatably installed horizontally on this mounting base 13. A pair of arms 15 extending along the waterway 7 are fixedly attached thereto, and an arc-shaped door body 16 centered on the main shaft 14 is fixedly attached to the upstream end of the arms 15. When the lower end of the gate body 16 reaches a height approximately equal to the set highest water level, the gate 12 will automatically open due to its own weight. A counterweight 17 is attached near the downstream end of the arm 15 so that it is located slightly downstream.
A stopper 18 that abuts the arm 15 is provided below near the downstream end of the arm 5 .

Further, an upstream waterway upstream from the gate 12 and a still water pond 19 provided on the side of the waterway are communicated via an inlet 20,
The downstream waterway on the downstream side of the gate 12 communicates with the retarding pond 22 via the water inlet 221. One side of the main shaft 14 extends from the channel edge toward the retarding pond 22 side, and one end of a float arm 23 is fixed to this extended portion facing upstream. A float 24, which will be described later, is suspended from the upstream end of the float arm 23.

As shown in FIGS. 1 and 2, a water level difference detection float chamber 25 is installed in the still water pond 19, and is communicated with the still water pond 19 via a small diameter water passage port 25a provided at the lower part. Inside the water level difference detection float chamber 25, there is a water level difference detection float 2.
6 is floated with a slight gap, and the inside thereof is communicated with the atmosphere via a ventilation pipe 27. Further, the inside of the water level difference detection float 26 is communicated with the water channel downstream of the gate 12 by a water guiding device. In this structure, a water guide pipe 28 that is inserted into a water inlet 25a and extends downward is connected to the lower end of the water level difference detection float 26, and a water control pipe 28 is connected to the water control pond 2 through a communication pipe 29.
2 and extends to the water inlet 21. In addition, the connection part between the water conduit 28 and the communication pipe 29 in the still water pond 19 is connected to the water conduit 28.
is inserted into the vertical part of the T-shaped communication pipe 29, the upper and lower openings of the vertical part are closed by gaskets 30 fixed to the water guide pipe 28, and the horizontal part is connected to the center of the vertical part. .

Furthermore, the float 24 is housed in a float chamber 31 provided between the still water pond 19 and the retarding pond 22 with a slight gap, and the float 24 is made sufficiently heavy so that it does not float as a single unit. The lower part has an air sealing part 24a, and the upper part is a hollow water guide part 24b, and the upper end has a small hole 24.
The water guide portion 24b is communicated with the atmosphere through a water pipe 32 having a flexible structure, and is communicated with a horizontal portion of a water control pipe 33 that bypasses the float chamber 31 through a water pipe 32 having a flexible structure.

The water control pipe 33 has a T-shaped structure, and the vertical part of the water control pipe 33 is opened in the still water pond 19, and the horizontal part from the center of the vertical part bypasses the float chamber 31, and the tip is a small-diameter outlet 33.
It opens into the retarding pond 22 at point a. As described above, the horizontal portion is connected to the water pipe 32 within the float chamber 31. Further, the vertical part of a T-shaped inflow pipe 34 is placed on the same vertical line below the vertical part of the water control pipe 33, and its horizontal part is connected to the center of the vertical part, and its tip is opened to the float chamber 31. There is. In addition, the water control pipe 33 and the inflow pipe 3
The water control pipe 28 passes through the vertical part of the water control pipe 3.
The openings above 3 and below the inflow pipe 34 are closed by a gasket 30 fixed to the water conduit 28, and the openings below the water control pipe 33 and above the inflow pipe 34 face each other with an appropriate distance between them. A valve body 35 fixed to the water conduit 28 is interposed therebetween, and as the valve body 35 moves up and down, one of its upper and lower openings is narrowed, closed, or opened. Furthermore, the float chamber 31 is communicated with the retarding pond 22 via a small-diameter outlet 31a.

In the present invention, the rise and fall of the water level difference detection float 26 can be detected by a limit switch, and the gate can be opened and closed by rotating the electric motor in the forward or reverse direction based on the signal from the limit switch. It is configured as a device that operates according to the water level.

A helix spring 36 of a water level difference correction device is attached to the upper end of the water level difference detection float 26, and the water level difference detection float 26 is suspended from a wire rope 37 via the helix spring 36. The means for holding the wire rope 37 will be explained below.

Above the wire rope 37 is a pair of upper and lower horizontal rails 3.
8 is fixed in the upstream and downstream direction of the waterway, and a fixed reel 39 is rotatably attached to the downstream end between a pair of horizontal rails. As shown in FIG. 4, between a pair of horizontal rails 38 is a pair of connecting plates sandwiching these from both sides, with an induction reel 40 arranged on one side of the fixed rail 39 and a main roller 41 arranged on the other side. 42 are supported through the guide reel shaft 43 and the main roller shaft 44, respectively, and are provided movably on the horizontal rail 38 by side rollers 45 attached to the ends of both shafts. Note that the side rollers 45 are loosely sandwiched between the upper and lower sets of horizontal rails 38. The main roller 41 also has an S-shaped cam plate 46a carved on a plate-shaped main cam plate 46 that is supported so as to be slidable in the vertical direction.
is mated to.

One end of the wire rope 37 is connected to the helical spring 36, and the wire rope 37 goes around the fixed reel 39 and the guiding reel 40 an appropriate number of times, and the other end 6 of the wire rope 37 is connected to the fixed reel 39 and the guiding reel 40. It is fixed to the nearest fixed object or to the connecting plate 42, depending on the number of times it goes around the loop 40.

Next, the configuration of an interlocking device that interlocks the main cam plate 46 with the rotating portion of the gate 12 will be described. As shown in Figure 1,
A link 47 is attached to the main shaft 14 of the gate 12 toward the upper downstream side.
is fixed, and a connecting member 48 is attached to the tip of the driving bottle 48a.
The other end of the connecting member 48 extends toward the upstream side. On the other hand, on the upstream side of the connecting member 48, there is an L
A lever 49 in the shape of a letter is rotatably supported with a lever shaft 49a arranged at a bent portion, and the other end of the connecting member 48 is connected to one end of the lever 49 in the shape of an L via a driven pin 48b. .

A line connecting the main shaft 14, the driving bin 48a, the driven bin 48b, and the lever shaft 49a forms a parallelogram.

The levers 49 are paired with each other across the vertical plane through which the main cam plate 46 passes, and the other end of the levers 49 is inclined upward at an appropriate slope even when the gate 49 is fully closed, and passes through the lever shaft 49a. Straight lever groove 49b centered on the slope
is cut. As shown in FIG. 5, a lift roller 50 is movably fitted into each lever groove 49b, and a general shaft 52 passes through the lift roller 51 which contacts the lower end of the main cam plate 46. Here, the working arm of the lever 49 refers to the length from the lever shaft 49a to the general shaft 52. The inclination angle of the lever groove 49b in the fully closed state will be explained later.

Next, the configuration of a stroke control device that controls the rise value of the main cam plate 46 to be constant regardless of the water depth will be described. Side rollers 53 are attached to both ends of the general shaft 52, and these are fitted into the rail rims 4a cut into the vertical parts of a pair of L-shaped roller positioning members 54, and are fitted into the lower horizontal parts of the roller positioning members 54. The left and right roller positioning members 54 are connected by three connecting rods 55 at both ends and in the middle.
are integrated, and the two connecting rods 5 closer to the lever shaft 49a
A pair of guide rollers 56 are attached to the connecting rod 5, and a positioning roller 57 is attached to the remaining connecting rod 55. The guide roller 56 is sandwiched between a pair of upper and lower guide rails 58, and a roller positioning member 54 is provided so as to be movable in the upstream and downstream directions. Further, a water level detection float 59 is provided in the still water pond 19, and a plate-shaped positioning cam 60 is fixed to the upper end of the water level detection float 59.
The positioning cam 60 is vertically movable, and is supported by appropriate means so that the positioning cam 60 is slidable in the vertical direction but remains at a constant position in the horizontal direction. The positioning roller 57 is fitted into an S-shaped cam groove 60a cut in the positioning cam 60.

Next, the mechanism for pushing up the main cam plate, the shape of the main cam groove, etc. will be explained.

The curves ■, ■, and ■ shown in Figure 7 are each at a water depth of 2
．． 0[1 m, 1.75 m and 1.50 m, the gate 12' immediately downstream of that gate 12 and the gate 12' downstream thereof
The water level difference immediately upstream of the gate 12 is shown in the opening heavy electric current of the gate 12. The opening degree ratio referred to here is a value divided by the opening degree in the fully open state (hereinafter referred to as full opening degree). As can be seen from the figure, the same main cam plate 46
If the water depth is small, the speed at which the main cam plate 46 is pushed up must be fast when it is close to fully closed and slow when it is close to fully open. In the embodiment, the length of the working arm from the lever shaft 49a of the lever 49 to the working position (the contact position of the push-up roller 51) is substantially increased, so that when the water is almost fully opened, The speed at which the main cam plate 46 is pushed up becomes faster. Also, since the opening angle when fully opened becomes smaller, the position of the fulcrum of the lever 49 (lever shaft 4
9a), the position of the push-up roller 51, and the intersection of the horizontal line of the fulcrum of the lever 49 and the vertical line of the push-up roller 51, then the differential coefficient of the trigonometric function is inversely proportional to the square of the cosine. Qualitatively speaking, it becomes slower when it is close to full throttle. However, in general, quantitatively, this effect is insufficient, but if the lever 49 is made to be inclined even in the fully closed state, the above effect will be further strengthened. Therefore, by appropriately selecting the angle of inclination of the lever 49 when the gate is fully closed, the tension of the helical spring 35 can be obtained with the same main cam plate 46 depending on the water depth and the opening degree of the gate.

0 The curve showing the relationship between the water level difference immediately downstream of the gate 12 and immediately upstream of the downstream gate 12' (hereinafter referred to as the water level difference in the channel) and the opening rate differs depending on the water depth, so the main cam plate 46 It is inevitable that an error will occur if the water depth is other than the one at which the main cam groove 46a is cut. Therefore, there are two possible ways to cut the main cam groove 46a: the most frequently used planned water depth, and the maximum water depth where the waterway is most dangerous. In this embodiment, the latter is used. However, the main cam groove 46a is cut along a curve at a water depth of 2.00 m.

The horizontal movement distance of the main roller 41 from fully closed to fully open is determined by the difference in the tension of the helical spring 36 between fully closed and fully open states, which is determined by the internal cross-sectional area of the water level difference detection float 26 and the gate 12. It is made to be equal to the weight of the water in the volume that causes the difference between the planned water level immediately upstream of the gate 12' and the downstream gate 12'. The main cam groove 46a of the main cam plate 46 from fully closed to fully open is made sufficiently large compared to the moving distance of the main roller 41 described above so that the main roller 41 does not get caught. Further, the length of the helical spring 36 is the same as that of the valve body 35.
It is made large enough so that the error in the water level difference caused by the change in tension as it goes up and down can be ignored.

Next, the inclination angle (hereinafter referred to as the initial angle) of the lever groove 49b of the lever 49 in the fully closed state will be explained. In the above, the rise value of the main cam plate 46 due to the opening movement of the gate 12 is the horizontal distance between the lever shaft 49a and the push-up roller 51 multiplied by the cutoff value corresponding to the rotation angle of the gate 12. Needless to say, as the water depth decreases, the rotation angle of the gate I2 until it reaches the fully open state also decreases. Therefore, in order to control the rising value of the main cam plate 46 to a constant value,
The lever shaft 49a and the push-up roller 5
It is necessary to increase the horizontal distance between 1. When the water depth becomes small, the rising speed of the main cam plate 46 increases automatically in a state close to fully open, and the rotation angle of the gate 12 is small in a state close to fully open, so the main cam plate 46 automatically increases. Although the rising speed of the plate 46 becomes slow, this tendency can be easily promoted by increasing the initial angle. now,
The initial angle is 30 degrees, and the main cam groove 46 is
If we cut a and use it in the case of curves ■ and ■, the gate 12 will open and close assuming the water level difference in the waterway as already defined above as shown by the circle in Figure 4. However, it is extremely small and poses no problem in practice.

Also, the main cam groove 46a where the main roller 41 is located when fully opened.
A vertical groove is cut in the lower part of the gate 12 so as to prevent the gate 12 from opening further than the fully open state and causing the arm 15 to come into contact with the stopper 18 (hereinafter referred to as the rest state). ing.

As mentioned above, the error caused by the device according to the present invention is extremely small, but if the water level immediately upstream of the downstream gate 12' rises or falls, the water level immediately downstream of the upstream gate 12 also rises or falls; Its value is smaller than that of the downstream gate 12', so a slight error will be amplified downstream, and since the errors in the position of each gate will be accumulated, the water level will be lowered so that the errors can be artificially corrected along the way. A correction weight 61 is attached to the upper end of the difference detection float 26 so as to be detachable.

Although the height of the upper end of the sealed portion 24a of the float 24 is, in principle, approximately equal to the highest water level when the gate 12 is at rest, it is preferable to delay the closing operation of the gate 12 in order to prioritize flood communication. In some cases, it is set lower than this, and when it is important to secure a water source and the closing operation is to be accelerated, it is set higher than this.

In the above, we have explained the configuration in which the gate 12 is a tender gate and it is unmanned and unpowered.
It can also be installed on the roller gate introduced in issue 421).
Alternatively, electric means may be used.

The following two effects will be explained.

In the fully open state, the height of the main cam plate 46 remains constant even if the water level of the water channel upstream of the gate 12 changes, and thus,
The tension of the helical spring 36 also remains unchanged. Therefore, the water level difference detection float 26 becomes stable when the water level difference upstream and downstream of the gate 12 is a predetermined value, but when the gate 12 is fully closed, the water surface below the gate 12 is horizontal. Therefore, the gate continues to be fully closed while the water level difference between the upstream and downstream gates is maintained at a predetermined value.

However, water diversion or drainage starts downstream of any gate 12 and the downstream water level decreases, or drainage flows in upstream and the upstream water level rises, causing the water level above the gate 12 to rise. If the downstream water level difference becomes excessive, buoyancy acts on the water level difference detection float 26 and it begins to rise.

As the tension increases, the tension of the helical spring 36 decreases,
Since the length is made sufficiently large, the water level difference detection float 26 rises sufficiently at the point when the water level difference between upstream and downstream becomes slightly large, and the valve body 35 that is integrated with it rises sufficiently.
As a result, the opening of the water control pipe 33 leading into the float 24 is narrowed, and the water in the float 24 passes through the water pipe 32 and is discharged into the reservoir 22 from the outlet 33a, causing the water level to drop. An inflow pipe 34 leading into the float chamber 31
The opening is opened, water flows into the float chamber 31, and the water level rises, causing buoyancy to act on the float 24, causing it to rise and opening the gate 12.

At that time, water pressure is applied to the valve body 35, which may cause vibration or be attracted to the water control pipe 33, but the water level difference detection float 26 and the water level difference detection float chamber 25
Since the gap between the two and the size of the water inlet 25a are made small, a buffering effect is exerted, so that the movement of the water level difference detection float 26 and, by extension, the movement of the gate 12 is extremely smooth. Therefore, when the gate 12 opens, the water level upstream of the gate 12 naturally decreases a little, but as described above, the operation of the gate 12 is not sudden, so the drop in the water level upstream of the gate 12 will soon start to decrease. '', the upstream gates 12'' open one after another, and finally the water intake gate 8 at the upstream end of the waterway opens, so all the gates 1 in the waterway 7
2. The water level immediately upstream of the 12′, 12″ is maintained as set, so that the flow rate passing through any gate point approximately matches the downstream water diversion or discharge volume. Therefore, in water utilization. There will be no excess or shortage of water, and drainage damage will not be concentrated.

In this way, the opening operation of the gate 12 causes the gate 1 to open.
The water level immediately downstream of -12 rises, and the water level difference detection float 2
Although the buoyant force acting on the main cam plate 46 decreases, the main cam plate 46
It is pushed up by the gate 12 via the lever 49 and the connecting member 48), and the tension of the helical spring 36 increases by that amount. As long as the water level does not change, the water level immediately upstream of the intermediate gate 12 will not change, and the flow rate will automatically change depending on the amount of water distributed or discharged downstream.

Next, an explanation will be given of an effect corresponding to a change in water level, which is an object of the present invention. The water level of the waterway 7 varies depending on the season, and the set water level of the water intake gate 1O in FIG. 6 is usually changed to be higher in the summer and lower in the winter. Furthermore, it is unavoidable that it will be lower in the case of abnormal drought and higher in the case of abnormal flood. Furthermore, if a large amount of water diversion is suddenly started, the water level will inevitably be low (but if it is stopped, it will inevitably be high. In such cases, in the conventional technology, the reduction ratio is also artificially changed one by one. And for that purpose, -dan, gate 1
2 must be fully closed, and changing the reduction ratio can only be done when the gate opening degree is small and there is little error.

However, in reality, the water level of the waterway 7 in Fig. 1 changes constantly because it depends on the water level of the drainage river 9, and the water level of the waterway 7 shown in Fig.
The degree of opening of gate 2 depends on the amount of waste water flowing into the waterway 7, so it is expected that there will be cases where the gate 12 is close to fully open but not fully open. Since this is not possible, the reduction ratio cannot be changed.

On the other hand, in this embodiment, the water level detection float 59 moves up and down immediately when the water level changes, and the positioning roller 57 is fitted into the cam 60a cut by the positioning cam 60 integrated with the float 59. The position of the push-up roller 51 in the horizontal direction is changed, and the position of the push-up roller 51 is adjusted to an appropriate position according to the water level and depth via the rail groove 54a integrated with the rail groove 54a, the side roller 53 fitted thereto, and the general shaft 52. Therefore, the rise value of the main cam plate 46 when fully opened is automatically kept constant regardless of the water level. In addition, as already explained in the configuration section, the initial angle of the lever groove 49b is set appropriately, and as shown by the circle in FIG. Since the tensions of the helical springs 36 are very similar, the water level difference between the upstream and downstream gates is maintained correctly even if the water level changes.

The functions of each individual gate 12 have been described above, but next, the functions of the water channel 7 as a whole will be explained with reference to FIG. First, we will explain what happens when a large amount of water intake suddenly starts during water use.

In this case, the gate 12 upstream of the water diversion point where water is taken
'' opens and the downstream gate 12 closes, but it is inevitable that the water level will drop slightly in the downstream area, but if the water depth becomes smaller, the water level difference that will occur in the waterway surrounded by the upstream and downstream gates will be Naturally, the difference in water level between the upstream and downstream sides of the gate 12 should be reduced accordingly.
The water level difference between the gates becomes too large, but in the conventional technology, there was no way to automatically correct this.
When the water level decreased, the water level difference between the gates remained large, so it took time for the most upstream water intake gate 10 to open, and the water level was slow to recover.

In contrast, in the present invention, the water level difference in the water channel 7 is expected to increase at the same time as the water level decreases, and the water level difference between the upstream and downstream sides of the gate 12 is reduced, so that the influence of the water level decrease is reduced to the next gate. 12' and 12'', and therefore the influence of the water level drop is dispersed over a wider area, so the absolute amount of the water level drop becomes smaller and the water level recovers more quickly.

Next, the effects during floods will be explained. As mentioned above, drainage from the downstream end of the waterway 7 during floods is carried out by the drainage river 9.
There are cases where it is not possible at all due to water level restrictions, and there are cases where there are no restrictions at all.In addition, there are various restrictions on drainage from the downstream end of the waterway 7, such as when draining using a pump. In order to explain various cases at once, for convenience, we will proceed with the explanation assuming that there are general restrictions. Of course, the difference between the amount of water flowing into the waterway 7 and the amount of water discharged from the waterway 7 during a flood is the amount of water stored in the waterway. The function of the gates 12 is to maintain a constant water level difference between the gates 12, so the water level in the waterway is determined by the amount of storage, and therefore changes from moment to moment, but as mentioned above, this can be sensed instantly. Since the tension of the helical spring 36 is appropriately corrected according to this and the opening degree of the gates 12, the water level difference between all the gates 12 remains unchanged.

Therefore, if a particularly large amount of water flows into the section in the middle of the waterway 7 and the water level in that section rises, the upstream game) 1
2'' is closed and its downstream gate 12' is opened,
Since the amount of water is dispersed and stored over the entire section of the waterway 7, flooding damage is unlikely to occur. In addition, in the present invention, without considering the location conditions, in all cases, if the two conditions of the water level reaching the highest water level and the gate 12 being fully opened are satisfied, the gate 12 will be opened under its own weight. The system is configured so that it automatically enters a dormant state and stops weir raising of the waterway 7. However, if drainage from waterway 7 is restricted in a certain section, if the dam is stopped, the water in the waterway will rush to the downstream end, causing concentrated damage. In areas where there is water, the width of the waterway 7 is made extremely large in order to safely store the difference between the inflow and drainage volume within the waterway.
Since the water flow capacity of the canal is several tens of times higher than the required capacity, the gate 1-12 operates in a state close to fully closed, and therefore the second requirement above is not satisfied, so the water in the canal is not satisfied. There is no risk that the damage will be concentrated at the downstream end.

Next, the operation in which the gate 12 is fully opened and then in a rest state will be explained. Gate 12' downstream of the gate 12
Assuming that the water depth immediately upstream of the gate 12 is equal to the water depth immediately upstream of the gate 12, the water level immediately downstream is mechanically scheduled according to the opening degree of the gate 12, and the actual water level immediately downstream is lower than this. The gate 12 is opened. As mentioned above, the gate 12 is fully opened and is in a dormant state only when there are no restrictions on drainage from the waterway 7.
The fact that there are no restrictions on drainage from waterway 27 means that water is being discharged while causing a falling backwater in terms of hydraulics, so the effect also extends to the downstream of the most downstream gate 12'. , the water level is lower than the mechanically scheduled water level, as mentioned above. Therefore, the water level difference detection float 2
The buoyant force acting on float 24 is large, so it rises, and float 24
The water level in the float chamber 31 decreases, the water level in the float chamber 31 rises,
The float 24 rises and tries to open the gate 12, but
When the flow rate of the waterway 7 is low and the water level is low, the gate 12 has frictional resistance and the center of gravity G of the entire rotation group is located upstream of the main axis, so that the gate body 16 of the gate 12 is
The lower end of is submerged in water.

However, if the flow rate increases due to a flood, the water level at the end of the waterway 7 will rise, as will the water level at each of the upstream positions 812, and as a result, the center of gravity G position of the entire rotation group will change due to the main axis 14.
, the source of water submergence of the door body 16 gradually becomes smaller as the water level rises, and when the water level reaches almost the highest water level, the center of gravity G of the entire rotating group comes to the downstream side of the main shaft 14. The gate 12 continues to open while draining the water in the float 24 due to its own weight, and the arm 15 is pressed against the stopper 18 to take a resting position.

Next, the effect of closing the gate 12 will be explained. When the flood water subsides and the water level in the waterway 7 decreases, and the sealed portion 24a of the float 24 is sufficiently exposed in the air, the gate 12 will of course close due to its weight. gate 1
Although the timing at which the seal 2 should close varies depending on local circumstances, the timing can be changed by adjusting the height of the upper end of the sealing portion 24a. Further, by removing and attaching the correction weight 61, the water level difference can be easily adjusted, and the gate 12 can be operated accordingly.

As described above, depending on the opening degree of the gate 12, the main cam plate 4
6 is pushed up through the interlocking device, the tension of the helical spring 36 is appropriately compensated, and the intermediate The water level immediately upstream of Gate 12 remains unchanged.
The flow rate changes automatically according to the amount of water diverted downstream or the amount of drainage. In addition, for all water levels and opening ratios, the theoretical value and the actually obtained tension of the helical spring 36 are very similar, so even if the water level changes, the water level difference between the upstream and downstream gates will be maintained correctly. Ru. In addition, the influence of the water level difference between upstream and downstream of the gate 12 is easily sensed by the next gates 12' and 12'', and therefore the influence of water level changes is dispersed over a wider area, and water level fluctuations can be recovered quickly. The difference in water level at each point will be maintained constant, thus ensuring fairness between the upstream and downstream areas.

(Effects of the Invention) Since the present invention is configured as described above, the working arm length of the lever that pushes up the main cam plate is set by the water level detection float that detects the upstream water level, and the cam formed on the main cam plate is The groove allows the tension of the helical spring to be adjusted according to the depth of the water and the degree of opening of the gate, making it possible to quickly maintain a constant water level difference upstream and downstream of the gate even if the water level fluctuates. By installing multiple gates in a waterway, it is possible to maintain a constant water level difference between the upstream and downstream areas, thereby ensuring fairness.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the flow-ready gate according to the embodiment of the present invention, FIG. 2 is a cross-sectional view of the flow-ready gate in the embodiment when it is fully open, FIG. 3 is a plan view of the flow-ready gate in the embodiment, and FIG. The figure is a sectional view taken in the direction of arrows IV-IV in FIG. 1, FIG. 5 is a sectional view taken in the direction of arrows V-V in FIG. 1, and FIG.
FIG. 7 is a cross-sectional view of the entire waterway in the example. FIG. 7 is a graph showing the relationship between the water level difference upstream and downstream of the gate and the opening rate of the gate in the example. FIG. 8 is a conventional gate with a constant water level difference. FIG. 9 is a sectional view of FIG. 8. 7... Channel 12... Gate 19... Still water pond 6 20... Inlet 26... Water level difference detection float 36... Helix spring 37... Wire rope 41... Main roller 46 ...Main cam plate 46a...Main cam groove 49...Lever 51...Pushing roller 59...Water level detection float Applicant: Toyokuni Kogyo Co., Ltd. Procedural report

Claims (1)

[Claims] (1) A still water pond is provided which communicates with the upstream waterway of the gate provided across the waterway through a small diameter inlet, and a water level difference detection float is connected to the still water pond, the inside of which is communicated with the downstream waterway of the gate. one end of a wire rope is connected to the upper end of the water level difference detection float via a helical spring, and the other end of the wire rope is moved along a cam groove formed in a main cam plate that is movable up and down. The main cam plate is connected to a main roller that moves along a vertically extending rail groove, and the main cam plate is engaged with the push-up roller, and the lever is provided so that the push-up roller is interlocked with the door body of the gate. A flow rate responsive gate, characterized in that the actuating arm is slidably engaged, and the push-up roller is horizontally moved in conjunction with a water level detection float floating in the still water pond.