JPH0853825A - Horizontally raking-type water-intake screen - Google Patents

Abstract

PURPOSE:To expel driftingly suspended matters to the downstream side to take water efficiently by arranging horizontally a large number of wedge bars of a bar-shaped body having nearly wedge-like section in a row to form a water-intake screen, and providing the water-intake screen with raking combs and sliding bars. CONSTITUTION:A water-intake screen 11 is provided to the front opening of a frame body 12 provided to a revetment of a river, etc. After that, the screen 11 is slid between wedge bars 36 in the direction of the water current along the screen 11, and the screen is slid between the wedge bars 36 in advance so that the screen 11 may slide normally between combs 18 for expelling foreign matters drifting to the front of the screen 11 to the downstream side and wedge bars 36 corresponding to the combs 18, and the screen 11 is equipped with sliding bars 19 having sliding fins for maintaining a horizontal state of the wedge bars 36. Then, suspended matters drifting to a water-intake are raked to the downstream end side of the screen 11, and they are expelled to the downstream side without their entering the water-intake. According to the constitution, an equipment for disposing of the foreign matters is not required, and substantially solely service water is taken from the screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen facility at a water intake of an irrigation canal.

[0002]

2. Description of the Related Art Conventionally, a floating material removal screen provided at an intake for agricultural water or the like generally descends at a constant gradient from the intake side to the supply channel side such as a river,
Arranged so as to be submerged in water, using comb teeth that slide in the water intake direction along the bar length between the bar screens that are arranged along the slope of the bar screen, scrape off floating substances and the like that have drifted to the water intake screen, and take them out. It is subject to dehydration, incineration, and other disposal.

[0003]

This water intake screen system requires a facility for disposing of contaminants scraped up by comb teeth and the transportation of the treated products to a disposal site.
The cost required for them is extremely high. In addition, when combing up, the screen is clogged with impurities when scraping,
Inconveniences such as water intake function being obstructed due to the troublesome restoration are likely to occur.

The present invention is intended to provide a screen structure for effectively performing only the intake of water, eliminating the need for the treatment of impurities associated with such a conventional vertical scraping type intake screen.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a rod-shaped body having a substantially wedge-shaped cross section at the front opening of a frame forming a water intake provided on a revetment of a river or the like. A number of wedge bars are horizontally arranged and arranged side by side so that the wedge-shaped edges are on the back side to form a water intake screen, and between the wedge bars in the water flow direction along the screen from the back side of this screen. A sliding comb having a large number of comb teeth for discharging to the downstream side the impurities drifted to the front of the screen by sliding, and the sliding comb in the direction of the flow and the position retracted behind the screen. And a scraping comb driving device which is driven in a turning circuit including a return stroke, and each of the scraping combs slides normally without departing between the corresponding wedge bars. A sliding rod having sliding fins for sliding between the wedge bars to maintain the horizontal state of each wedge bar prior to the scraping comb, and slidingly driving the sliding rod in the same manner as the scraping comb. It is characterized by being equipped with a rod drive device.

According to the present invention, an end portion of each wedge bar constituting the screen on the upstream side in the flow direction is fixed to an edge of the frame body on the upstream side in accordance with a screen size standard, and the wedge bar of each of the wedge bars is fixed. An end portion on the downstream side in the flow direction is provided in each of the play grooves formed in multiple stages on the edge of the frame body on the downstream side in accordance with the screen dimension standard,
It is characterized by loosely mating and holding the upper and lower surfaces.

Further, in the present invention, by supplying a fountain flow from the back side of the screen toward the screen in the frame body, earth and sand or fine contaminants adhering to the wedge bar of the screen, or floating approaching the screen. It is characterized in that a pipeline having a water injection port for discharging an object from the screen is arranged.

[0008]

According to the above construction, the floating substances floating on the intake are attracted to the downstream end of the screen by the comb teeth sliding in the water flow direction along the screen between the horizontal grids of the screen. , It will be discharged downstream without taking the flow of rivers and the like without entering the intake. Therefore, it is clear that substantially only water is taken in from the screen, and the conventional equipment for treating the scraped foreign matters is unnecessary.

In the present invention, since the screen is composed of the lateral lattice rows, each wedge bar is bent due to its own weight. However, in the present invention, the wedge bars slide between the wedge bars prior to the comb teeth. Since there are sliding fins for maintaining the horizontal state of each wedge bar, the bending of the wedge bar is suppressed, and each comb tooth can stably slide between the corresponding wedge bars. In this case, since the downstream end of each wedge bar is loosely fitted and held on the downstream edge of the frame as described above, smooth sliding of the comb teeth is further facilitated. Further, in order to reduce the weight of each wedge bar and reduce the bending itself, if these wedge bars are molded in a hollow shape, the load on the comb teeth and the sliding fins during sliding is reduced, and therefore the drive system is accordingly reduced. The load of can be reduced.

Further, in the water intake screen of the present invention, since the wedge bars are oriented laterally, the earth and sand or the minute contaminants which are gradually deposited on the upper surfaces of these wedge bars can be easily discharged by the jet of water from the back surface of the screen. No water is returned to the water channel on the supply side, clogging is generated from the downstream end of the screen, and the comb teeth and the wedge bar are not worn by being interposed between the comb teeth and the upper surface of the wedge bar.

[0011]

1 is a perspective view showing an installed state of a horizontal scraping type water intake screen according to the present invention, FIG. 2 is a schematic plan view thereof, and FIG. 3 is a side sectional view thereof. Gutter pipe 15 forming an intake channel
(Fig. 3) starts from the water intake structure 3 provided in a section of the revetment 2 in the water supply channel 1 of the river or the like. The intake structure is a wing wall 4 on the right side of the figure that is inclined along the seawall 2,
Gate post 6a located at the rear end between the inspection stairs 5 on the left side,
6b. A chest wall 7 is formed in the upper part between the gate columns 6a and 6b, and an intake gate 8 is vertically movable on the front side of the chest wall 7. Intake gate 8 shown in FIGS. 1 and 3.
The position of is in the waterway cutoff position down to the waterway floor,
At the time of use, the gutter pipe 15 is opened by lifting it to a position overlapping the chest wall 7. Gate post 6a, 6
On the front side of b, the groove bodies 9 facing each other from the underwater tapping to a position several tens cm higher than the normal water level of a river or the like.
a and 9b are erected, and the weir support groove 10 is provided on the opposing surface thereof.
a and 10b are formed. The horizontal scraping-type water intake screen 11 of the present invention is attached to the front surface of a box-shaped screen frame body 12 made of a stainless steel plate or the like provided between the blade walls 4 and the stairs 5 in front of the groove bodies 9a and 9b.
An electric motor box 13 is erected on the top surface of the screen frame 12. In the electric motor box 13, a completely closed electric motor for driving a screen scraping comb and a sliding rod, which will be described later, is housed. Flexible from a front edge of the screen frame body 12 made of a rubber plate or the like that comes into contact with the inner surfaces of the wing walls 4 and stairs 5 of the intake structure according to the widening angle of the stairs 5 toward the river. Both blades 14a and 14b having a sex are attached. Behind the screen frame body 12, there is provided an appropriate corner drop 16 (FIG. 2) which is conventionally inserted and supported in the support grooves 10a and 10b of the groove bodies 9a and 9b on both sides. The screen frame 12 is appropriately connected to the lowered water intake gate 8 and can be lifted from the installed state when necessary.

As shown in FIG. 4, the screen 11 attached to the front of the screen frame 12 has a large number of stainless wedge bars 17 made of a rod having a substantially wedge-shaped cross section, the wedge-shaped edges of which are rear surfaces. The water intake screens of the present invention are named wedge bar screens. The wedge bar preferably has a thickness of 6 mm on the front side,
The thickness is 2 mm on the back side and the wedge bars made of stainless steel having a width (thickness or depth of screen) of 19 mm are arranged at an interval of 5 mm on the front side.

FIG. 5 shows a schematic structure of the screen frame body 12. Reference numeral 18 is a scraping comb that slides between the wedge bars of the screen 11, and reference numeral 19 is a space between the wedge bars that precedes the scraping comb 18. It is a sliding rod. The combination of the scraping comb 18 and the sliding bar 19 is supported and driven by a pair of drive chains 20a and 20b located above and below the back side of the screen 11. The chains 20a, 20b are drive side sprockets 21a, 21b located below the motor box 13 and driven side sprockets 22a, 22b at the right end side in the figure.
It is stretched between each. As shown in FIG. 6, sets of scraping combs 18 and sliding rods 19 are provided at three positions of these chains, generally 20. Reference numeral 23 denotes a chain tensioning handle for correcting looseness caused by the use of the chains 20a and 20b.
The shaft of the handle 23 and the driven sprockets 22a, 2
It is formed between the support shaft 2b. In the screen frame 12, a screen backwash pipeline 2 is further provided.
5 are arranged. The pipeline 25 has a fountain pipe 26 on the upstream side of the intake part and a fountain pipe 27 on the downstream side of the intake part. In the upstream side fountain pipe 26, from the fountain ports 26a and 26b at the upper and lower positions of the screen, and the downstream side fountain pipe. At 27, backwash water is spouted from the corresponding spouts 27a, 27b, 27c at the top, middle, and bottom of the screen, and floating materials approaching the screen and sediments in the water that adhere to the wedge bar and try to accumulate, etc. Contaminants in the river are discharged to the river side. That is, since the amount of earth and sand adhering to the wedge bar increases toward the downstream side due to the movement of the water flow and the scraping bar, the downstream side fountain pipe 27 is provided with the nozzles 27a, 27b and 27c at the underwater position corresponding to the screen 11. The foreign substances that try to cross the upper and lower ends of the screen are returned to the river side by the fountain flows from the fountain ports 26a and 26b in the upstream fountain pipe 26.

FIG. 7 is a side sectional view showing the mounting and driving mechanism of the screen scraping comb 18. Each comb tooth of the scraping comb 18 is attached to the L-shaped angle steel 28 at the rear end, and this L-shaped angle steel is a chain. 20a, 20b, and is supported by a cantilever roller 30 that rolls on a guide rail plate 29 that is located near the lower side of the chain stroke between the upper sprockets 21a and 22a and is parallel to the chain stroke. It is possible to move the turning circuit in the horizontal plane.

FIG. 8 shows a holding and driving structure for the sliding bar 19 similar to the scraping comb of FIG. The sliding bar 19 is formed by holding an array of multi-stage disc type fin units 31 made of rigid resin plastic or other rigid body by means of stainless steel support shafts 32, and mounting members 33a made of L-shaped metal fittings at both ends thereof. , 33b are mounted, and these mounting fittings 33a, 33b are attached to the chain 20.
a cantilever roller 34 that is connected to a and 20b and rolls on a guide rail plate 29 that is also used as the scraping comb 18.
Is held by the upper mounting member 33a. Plate-like body 3 located at the same level as the upper and lower sprockets
5a, 35b are inside the chains 20a, 20b extending between the drive sprocket and the driven sprocket,
It is a resin damper plate having a side edge serving as a contact guide surface of a chain roller. Therefore, the sliding bar 19 and the scraping comb 18 have a stable turning pattern in which the cantilever roller 34 maintains a horizontal level and the presence of the damper plates 35a and 35b maintains a linear locus between the sprockets.

The comb teeth of the scraping comb 18 and the fin portions of the sliding rod 19 and the wedge bars 36a which come into contact with the upper and lower portions of these.
The relationship with 36b and the damper plate, that is, the horizontal positional relationship with 35 as a whole are as shown in FIG.

FIG. 10 is a plan sectional view showing the shape of both ends of the wedge bar and the structure for attaching the wedge bar to the screen frame. Both end portions of the wedge bar 36 are notched in a front half portion (thick portion), and these portions are attached to the holding grooves of the bar holding bars 37 and 38 attached to the opening edge portion of the front plate 12a of the frame body 12. It shows the state of being held by 37a and 38a. The left notch portion of the wedge bar 36 is locked to the front plate 12a of the screen frame body, and the right notch portion is locked to the front plate 12a and the spacer 39 so as not to move in the front-rear direction. As shown in FIG. 11, the main part side cross section (AA cross section) of the right bar holding rod 37 is as shown in FIG.
The two-sided holding groove 37a is formed on the a side according to the wedge bar interval according to the screen size standard, and each holding groove has a deep groove portion that grips the wedge bar according to the wedge-shaped inclination of the wedge bar and a thicker front side edge thereof. It consists of a two-step structure with a front groove that is received with. Thus, the right end (upstream side of the water intake portion) of the wedge bar 36 is restrained in the front-rear direction and the vertical direction, and the spacer 39 also prevents the rightward movement.

On the other hand, the holding groove 38a of the bar holding rod 38 for supporting the left end of the wedge bar 36 (downstream of the water intake portion) is shown in FIG.
As shown in FIG. 2, the wedge bar 36 has a structure similar to that of the wedge bar 36 or has a larger taper angle so that the wedge bar 36 can be received with a margin.
The left end loosening / holding structure of the wedge bar 36 is
Predict that the wedge bar, which is made of stainless steel and receives a large bending moment as a whole due to its own weight, will bend despite the horizontal movement of the comb and the sliding rod. The left end of the wedge bar is allowed to move up and down so that the parts maintain the same level. FIG. 13 shows a state in which the bar holding bar 38, the wedge bar 36, and the front plate 12a of the screen frame are separated in order to explain such a left end structure in detail. However, in actual mounting of the left end of the wedge bar,
This is performed by inserting the left end of the wedge bar 36 from the right end (opening end) side of the bar holding rod 38 fixed to the front plate 12a. For this purpose, the right end side of the wedge bar has already been inserted into the bar holding rod 37 similarly fixed to the front plate 12a, and there is no spacer 39 (FIG. 10). Then, as shown in FIG. 10, the spacer 39 is pushed into the notch so as to be flush with the wedge bar 36 and the front plate 12a and fixed to the front plate 12a to complete the attachment of the wedge bar. To do. The width of this spacer 39 is the wedge bar 3
It will be easily understood that the wedge bar 36 can be removed from the front surface of the frame body by removing the spacer 39 because it is larger than the left end notch size of 6.

FIG. 14 shows the details of the holding state of the scraping comb 18 sliding between the wedge bars 36 attached as described above, and the chain 20 for driving the comb.
It shows a part of the sprocket shaft fixing and adjusting mechanism above the driven sprocket 22a for a.
Reference numeral 40 is a moving block of an adjusting mechanism that holds the upper end of the shaft of the driven sprocket 22a, and 40a is a fastening screw therefor. L-shaped angle steel 28 comb teeth 18a
15, the square washer 43 having the same mounting hole 42 as the mounting hole 41 at the root of the comb tooth 18a is alternately stacked, and the mounting holes 41 in which these laminated bodies are aligned are arranged as shown in FIG. The mounting rod 44 is inserted through the shaft 42, and the nuts 46 are tightened through the washers 45 at the threaded portions formed at both ends of the mounting rod 44. Washers 43 between the comb teeth are selectively fixed at the upper and lower ends of the L-shaped angle steel 28 and at appropriate intermediate positions, whereby the L-shaped angle steel and the comb teeth 18a are completely fixed.

Details of the shape of the comb teeth 18a are as shown in FIG. 16A. The tips of the comb teeth 18a have a front edge 47 having an angle of 45 ° with respect to the protruding direction of the comb teeth in a sliding state in which the main body linearly moves in a posture perpendicular to the wedge bar 36.
And the portion of the trailing edge 48 which is at 90 ° to the leading edge and has an angle of 45 ° in the opposite direction, are shaped to project completely from the wedge bar 36 and retain their comb teeth 18a in the chain. The part is engaged with the drive sprocket 21 first, and further rotated from the position shown by the solid line to further rotate the wedge bar 3
As shown by the imaginary line 18a ′ in the figure from 6 to just before retreating, the comb teeth rotation circuit is set so that the angle formed by the front edge 47 and the front end of the wedge bar 36 is an obtuse angle, so that the comb teeth are pushed by the comb teeth. Do not sandwich foreign matter between wedge bars,
Rather, it is configured to be discharged to the side of the water supply channel by the cam action. The cross section in the thickness direction at the tips of the comb teeth 18a is also tapered as shown in FIG. 16B,
It can be easily inserted between wedge bars.

FIG. 17 is an enlarged view of the upper part of the sliding rod and its mounting structure shown in FIG. As described above, the sliding rod has a plurality of multi-stage disc fin units 31 made of resin or the like held in cascade on the stainless support shaft 32, and the unit shown in FIG. According to the above-mentioned example of dimensions of the wedge bar, it has a length of, for example, 198 mm, and this is applied to a screen width of about 1 m in height by mounting 5 steps.

FIG. 18 is a diagram showing a schematic structure of the chain tensioning mechanism 24. The handle shaft 23a is provided with miter gears 49a, 49b inclined at 45 ° just below and at the lower end of the handle.
The chain tension mechanism 24 holds the miter gear 49.
a, 49b, a miter gear 50 engaged with each of the a, 49b, a horizontal pushing shaft 51 supporting the miter gear 50, a fixed block 52 screw-engaged with the pushing shaft 51, and a tip of the pushing shaft 51. The moving block 40 (see FIG. 14) is connected so as to allow only rotation of the shaft. The upper and lower ends of the support shafts 54 of the driven sprockets 22a and 22b are connected to the upper and lower moving blocks 40, respectively. . With such a configuration, when the handle 23 is rotated, the pushing shaft 51 supporting the driven-side miter gear 50 is rotated accordingly, and the left and right sides of the drawing according to the rotation amount due to the screw engagement with the fixed block 52. In this direction, the moving block 40, and hence the driven sprockets 22a and 22b, are moved. FIG. 19 is an enlarged view of the chain tensioning mechanism 24. The fixing block 52 is fixed to a horizontal support bracket 54 (see FIG. 5) fixed to the upper portion of the screen frame body 12, and the rear end of the miter gear 50 is fixed. Engages with a screw portion 51a formed on almost the entire length of the horizontal support shaft 51 extending from
In the horizontal support bracket 54, the movable block 53 movable in the length direction is moved. A shaft penetrating boss 55a is provided on the upper surface of the gear box 55 accommodating the miter gear.
It is fixed by a screw member 55b screw-engaged with a, so that the support shaft 53 of the driven sprocket can be fixed with respect to the screen frame in the chain tension state.

[0023]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to efficiently discharge water by discharging it to the downstream side as it is, without floating up floating matters floating at the intake on the screen. (EN) Provided is a screen suitable for multipurpose water intake which is possible, smooth in operation, less in failure, and extremely easy in maintenance and inspection.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a water intake in one embodiment of the present invention.

2 is a plan view of the water intake port of FIG. 1. FIG.

FIG. 3 is a side sectional view of the water intake of FIG.

FIG. 4 is a partial side sectional view of a water intake screen attached to the water intake.

FIG. 5 is a front view showing the structure of each part in the screen frame body to which the water intake screen is attached.

FIG. 6 is a schematic plan view of a screen frame body.

FIG. 7 is a side sectional view showing the holding and driving structure of the scraping comb viewed from the driven sprocket side in the screen frame.

FIG. 8 is a side sectional view showing a structure for holding and driving the sliding rod in the same manner.

FIG. 9 is a partial plan view showing a relationship between a sliding bar and a scraping comb and a corresponding wedge bar, and a chain damper plate.

FIG. 10 is a partial plan sectional view showing a wedge bar mounting structure in the screen frame.

11 is a sectional view taken along the line AA of FIG. 10 showing the right end support structure of the wedge bar.

12 is a cross-sectional view taken along the line BB of FIG. 10 showing the left end holding structure of the wedge bar.

FIG. 13 is a partially exploded perspective view showing the left end holding structure of the wedge bar.

FIG. 14 is an enlarged top side sectional view showing a scraping comb holding and driving structure.

FIG. 15 is an exploded perspective view showing the assembly structure of the scraping comb.

16A is a partial plan view showing the positional relationship between the comb teeth of the scraping comb and the wedge bar, and B is a cross-sectional view of the tip end of the comb teeth. FIG.

FIG. 17 is an enlarged cross-sectional view of the upper side showing the main part of the sliding rod holding and driving structure.

FIG. 18 is a schematic front view showing the outline of a chain tensioning mechanism.

FIG. 19 is a schematic cutaway front view showing a main structure of a chain tensioning mechanism.

[Explanation of symbols]

 11 Horizontal scraping type water intake screen 12 Screen frame 13 Electric motor box 17 Stainless steel wedge bar 18 Scooping comb 19 Sliding bar 20a, 20b Drive chain 21a, 21b Drive side sprocket 22a, 22b Driven side sprocket 23 Chain tension handle 24 Chain Tension mechanism 25 Screen backwash pipeline

Claims (7)

[Claims] 1. A large number of wedge bars, which are rod-shaped bodies having a substantially wedge-shaped cross section, are provided at the front opening of a frame body which forms a water intake provided on a revetment of a river or the like, and the wedge-shaped sharp edges are on the back side. The water intake screen is constructed by arranging and arranging them horizontally as shown in the figure, and by sliding between the wedge bars in the water flow direction along the screen from the back side of this screen, the contaminants washed ashore on the front side of the screen are moved to the downstream side. A scraping comb having a large number of comb teeth to be ejected to a driving circuit, which is driven in a turning circuit including a sliding stroke in the flow direction and a returning stroke in a position retracted to the rear of the screen. Before the scraping comb, the space between the wedge bars is arranged so that the driving device and the scraping comb slide normally without departing between the corresponding wedge bars. A horizontal bar scraper characterized by being equipped with a sliding bar drive device for swinging a sliding bar having sliding fins for sliding to maintain the horizontal state of each wedge bar in the same manner as the scraping comb. Mold water intake screen. 2. An end portion of each wedge bar constituting the screen on the upstream side in the flow direction is fixed to an edge of the frame body on the upstream side in accordance with the screen size standard, and the wedge bar of each of the wedge bars in the flow direction is fixed. The downstream end portion is loosely fitted and held on the upper and lower surfaces in each of the loose grooves formed in multiple stages according to the screen size standard on the same downstream edge of the frame body. Intake screen described. 3. In the frame, by supplying a fountain flow from the back side of the screen toward the screen, the sand or fine contaminants adhering to the wedge bar of the screen, or the suspended matter approaching the screen are screened. The water intake screen according to claim 1, wherein a pipeline having a water injection port for discharging from the water intake screen is provided. 4. A pair of drive chains, wherein the scraping comb driving device and the sliding rod driving device are closely arranged parallel to the upper and lower ends of the screen on the back side of the screen and stretched along the turning circuit. A coupling fitting for coupling between each of the upper and lower handle portions of the scraping comb and the corresponding one of the link portions of the pair of drive chains, and an upper end mounting member for the sliding rod. And each of the lower end mounting members,
Connecting metal fittings that respectively connect different link parts of the pair of drive chains corresponding to each other, and a chain roller inside the chain locus extending between the drive sprocket and the driven sprocket of the pair of drive chains. A damper plate having a side edge serving as a contact guide surface, a guide rail provided close to and parallel to the sliding stroke and the returning stroke of the drive chain on the upper end side of the screen, and the upper end of the scraping comb. By running on the guide rail while being cantilevered by each of the handle portion and the upper end mounting member of the sliding rod, the scraping comb and the sliding rod are substantially constant over the entire chain-driving process. The intake screed according to claim 1, further comprising a cantilevered support roller for maintaining the height level of the cantilever. Down. 5. The water intake screen further holds an upper end and a lower end of a single vertical shaft supporting a driven sprocket of the pair of drive chains so as to be positionally adjustable in a chain tension direction with respect to a frame body of the screen. A pair of moving blocks, and a pair of position adjusting rods that are fixed relative to the pair of moving blocks in the chain tensioning direction and are relatively rotatably connected about an axis along the same direction; A screw block screw-engaged with the position adjusting rod to set the position of the position adjusting rod in the chain tension direction, and a rotation transmitting unit for rotating the pair of position adjusting rods around their axes. The water intake screen according to claim 4, further comprising a chain tensioning device having a vertical operation rod having a handle attached to an upper end thereof. 6. The water intake screen according to any one of claims 1 to 5, wherein the wedge bar is formed in a hollow shape. 7. The front edge of the comb tooth has a front edge portion having an angle of 45 ° with respect to the comb tooth protruding direction in a sliding state in which the main body linearly moves in a posture perpendicular to the wedge bar, and the front edge thereof. The trailing edge portion having an angle of 45 ° in the opposite direction and completely projecting from the wedge bar, and at the stage of finishing the linear movement, further turning until just before retracting from the wedge bar. By setting the turning circuit so that the angle formed by the front edge portion and the front end of the wedge bar is an obtuse angle, the contaminants pushed by the comb teeth do not get caught between the wedge bars, and the supply water channel is formed by a cam action. The water intake screen according to claim 1, wherein the water intake screen is configured to be discharged to the side.