JPH08318269A - Scum removing apparatus - Google Patents

Abstract

PURPOSE: To remove scum automatically, certainly and smoothly without employing a worker. CONSTITUTION: A scum removing apparatus is constituted of a trough 17 fixed and arranged in a trough-shaped sedimentation basin, the weir 16 provided to one side of the trough 17 so as to be made movable up and down across the surface of the water, the seal 33 between the weir 16 and the trough 17 and the means driving the weir 16. As the means driving the weir, the power of a sludge scraper is utilized or the water introducing and discharging space formed in the weir 16 is utilized to float and sediment the weir 16. The weir 16 is supported on the trough 17 in a freely shakable manner through the horizontal axis like center of rotation. The seal 33 is provided between the upper and lower surfaces and side surfaces of the weir 16 and the trough 17. The seal 33 between the upper and lower surfaces is composed of an elastic material to be attached to the weir 16 and the trough 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a scum removing device used for attracting and removing scum floating on the water surface, which is installed not only in settling basins, sand setting basins, aeration tanks but also in rivers, lakes and marshes. Regarding

[0002]

2. Description of the Related Art A sludge attracting device is constructed in a first or final settling tank, and generally, a chain drive is used to circulate a flight of a flight to scrape sludge settling at the bottom of the pond in one direction. On the other hand, although scum floats on the water surface, the scum is configured to be scraped in one direction by the above-mentioned flight and removed by the scum removing device.

[0003]

The scum removing device so far has been constituted by what is called a scum schema. This scum schema is a cylinder that has an opening for swallowing the scum and is supported horizontally so that it can be rotated back and forth, but this device rotates the schema manually back and forth. Since it is a system, it requires a worker for rotation operation, and since the scum schema itself, which is a cylindrical body, is supported at both ends, the weight between the supports easily bends the entire body, making it difficult for the support shaft to rotate. was there. In order to solve the above-mentioned problem, an object of the present invention is to eliminate the need for an operator for scum removal, and to ensure smooth and reliable operation.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 has a trough shape fixedly installed inside a sedimentation pond or the like, and at least one side of which has a portion lower than the water surface. A trough, a weir that is provided on the one side of the trough and can move up and down with the water surface as a boundary, a seal that prevents water from entering between the weir and the trough, and the weir is driven. And means.

According to a second aspect of the present invention, in the first aspect, the means for driving the weir is the power of a sludge trapping device or the like that circulates inside the sedimentation basin or the like.

According to a third aspect of the present invention, in the first aspect, the means for driving the weir can introduce water into the space formed inside the weir so as to be retained, and the introduced water is drained little by little. It is configured to float up and down.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the weir is swingably supported on the trough side via a horizontal axis-shaped rotation center.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the seal is formed between the weir and the trough vertically and between side surfaces, and the upper and lower seals are made of an elastic material. It consists of a weir and a trough.

[0009]

According to the first aspect of the present invention, since the fixed trough and the movable weir are divided and sealed between them, the weir can be driven freely. It is sufficient to move only the above-mentioned one up and down, and since the weir which can be reduced in weight can be driven up and down or bidirectionally by the driving means, no worker is required.

According to the second aspect of the present invention, in the first aspect, the weir is configured to be driven by utilizing the power of the sludge attracting device that circulates inside the sedimentation basin or the like. It is possible to drive the weir using the power of the existing device as it is, and it is not necessary to newly install a power source for driving the weir.

According to a third aspect of the present invention, in the first aspect, the means for driving the weir can introduce water into the space formed inside the weir so as to be retained, and the introduced water is drained little by little. Since it is configured to float up and down, the drive means can be unitized together with the device main body such as trough and weir, which makes the work from production to construction efficient and reliable. .

The invention according to claim 4 is the method according to any one of claims 1 to 3, wherein the weir is swingably supported on the trough side via a horizontal axis-shaped rotation center. Movement becomes reliable and smooth with reference to the rotation axis,
At the same time, it is highly durable.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the seal is formed between the weir and the trough vertically and between side surfaces, and the upper and lower seals are made of an elastic material. Since it is attached to each of the weir and the trough, it is possible to maintain the tightness between the upper and lower sides and the side surface without impairing the operability of the weir, and since the seal is an elastic material, the space between the trough and the weir Even if the gap between the two becomes variable due to the weight, the seal absorbs elastically and can cope with the fluctuation, and since the seal is mounted on both the trough and the weir, the sealing performance is perfectly demonstrated and the durability is improved. It will also be rich.

[0014]

The present invention will be described in detail below with reference to the illustrated embodiments. 1 to 4 show an embodiment of the present invention, FIG. 1 is a sectional view taken along line II-II of FIG. 2, FIG. 2 is a front view of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is an exploded perspective view of the weir support portion.

As shown in FIG. 2, the sedimentation basin comprises side walls 1 facing each other on the left and right sides, and a back wall 2 orthogonal thereto. A flight-type sludge scraping device 3 is configured in the settling basin, and the device 3 is provided with a pair of right and left sprockets 5 on the outer circumference of a 4-shaft type support shaft 4, as shown in FIG. A chain 6 as an endless transmission member is hung on the outer periphery of the sprocket 5 so as to form a left and right pair. Then, around the same chain 6, flights 7 ... Are attached to the side wall 1 so as to be orthogonal to each other.

When these flights 7 come up, the flight proceeds with the upper end partly protruding above the water surface 8, so that the floating scum is scraped toward the scum removing device 10. A driving roller 9 is attached to one end of some of the flights 7, and the roller 9 serves as one of the power transmission devices from the sludge attracting device 3 to the scum removing device 10. There is.

It is a Narai arm (arm-shaped cam) 12 that acts as the roller 9 advances, and the Narai arm 12 is attached around a fixed shaft 13 protruding from one side wall 1 so as to be on the water surface. It is attached to one end of the rotatable arm shaft 14 so as to protrude forward.
The entire Narai arm 12 is bent in a substantially V shape so that the tip is located above the roller 9, the portion after the tip is located below the traveling path of the roller 9, and the bent portion is the lowest. The protrusions 12a are formed in two steps in the front and rear, sandwiching the recess.

A push-down arm 15 projects toward the device 10 side of the arm shaft 14 so as to always swing up and down in the opposite direction to the Narai arm 12. That is, the push-down arm 15 descends when the Narai arm 12 is lifted and rises when the Narai arm 12 is lowered. This pushing arm 15
Pushes down the weir 16 of the scum removing device 10 as an interlocking lever.

On the other hand, the main body side of the apparatus 10 is provided with a trough 17. As shown in FIG. 3, the trough 17 has a flange 1 at the rear upper end of the L-shaped cross section 17a.
7b and a front plate portion 17c that vertically protrudes upward from a lower portion of the front end of the portion 17a. On the upper side of the front plate portion 17c, there is further provided a mounting plate portion 17d that extends inwardly in a short direction. The mounting plate portion 17d stands up at an angle of about 60 degrees with respect to the horizontal line, and as shown in FIG. , From the front, it looks like a strip.

The trough 17 is integrally provided with trough side flanges 18 at both ends thereof, and its shape is as shown in FIGS. 3 and 4. That is, the flange 18 is
It has a rectangular plate frame shape, and at its periphery, a communication side flange 20 of a communication trough 19 fixed so as to penetrate the side wall 1.
A hole 18a connected with the bolt 21 is opened, and a protrusion 18b is provided on the front inner peripheral portion. An arcuate notch 18c is formed in the lower portion of the protruding portion 18b, and a screw hole 18d is opened in the center. Further, a horizontal receiving piece 22 projects outward at the upper part of the projecting portion 18b, and the receiving piece 22 has one open slit 22.
a is formed.

As shown in FIG. 4, a vertically long bracket 24 having a boss 24a and a mounting bolt 24b is mounted by a bolt 25 on each outer surface of the protrusion 18b. In the bracket 24, the mounting bolt 24b is inserted into the slit 22a, and the nut 26 can be adjusted up and down.
It is fixed at a suitable height with bolts 25. The boss 24a faces inward through the notch 18c, and the spherical bearing 27
Is inserted. The bearings 27 are arranged in a pair on the left and right, and the weir 16 is swingably supported through the bearings 27, and the nut 25 is loosened even after the weir 16 is mounted.
By adjusting the bolt 24b up and down with, the height and inclination of the weir 16 can be freely adjusted. Incidentally, the receiving piece 22 and the bracket 24
Etc. can also be arranged inside the trough 17. On the other hand, it is also possible to fix the bearing to the trough 17 side together with the weir 16 by bolting the bearing to the trough 17 without using such an adjustment method.

The weir 16 is a hollow and flat pipe so that buoyancy is generated, its tip is rounded (may be square), and its base is squared. The inside of the weir 16 may be filled with foamed resin. This weir 16
Fixed right and left fan-shaped side plates 30 are provided. A rotary shaft 31 projects from the outer surface of the base of the side plate 30, and the rotary shaft 31 is inserted into a spherical bearing 27 to be rotatable. On the outer surface of the side plate 30, a vertically long and elastic side surface seal 33 is fixed in a seal holding projection 32 composed of two front and rear sides as shown in FIGS. 1 and 2, and the seal 33 is always attached to the side plate 30. It is designed to prevent water from entering from the front while making contact.
Contrary to the above, the trough 17 is provided with a seal on the weir 16 side.
A side plate may be provided on the side.

On the other hand, a front seal 35 is attached along the mounting plate portion 17d of the trough 17, and the seal 35 is
As shown in FIG. 2, the lower portion is formed into a bifurcated shape so as to be fitted into the mounting plate portion 17d, and a round inflection portion 35a is formed in the middle stage so as to be freely bendable. Further, the upper end portion of the seal 35 is attached to the rear surface of the base end of the weir 16 by being sandwiched by the pressing plate 34.

When the weir 16 floats, it rises at a right angle from the front seal 35 at an angle of about 40 degrees from the horizontal line, while the tip of the weir 16 sinks at a level of 20 to 30 mm (or more) from the water surface 8. To go down. In order to lower this, as shown in FIG.
Between the tip of the and the front lever 37 protruding to the weir 16 side,
A length adjustable rod 38 is connected. The pushing arm 15 and the weir 16 may be directly connected to each other through the long hole and the roller. As shown in FIG. 3, at the upper end of the rear part of the trough 17, a bracket 42 is provided with a lever 42 via a shaft 41, a manual lever 43 is provided at one end of the lever 42, and another front part is provided at the other end. A rod 44 connected to the lever 37 may be provided so that the weir 16 can be appropriately pushed down from the pond.

The scum removing device 10 of the above embodiment is shown in FIG.
In the state shown in (1), it is in a blocking state, and the Narai arm 12 is lowered. When the roller 9 lifts the Narai arm 12, the pushing arm 15 is lowered, and the front lever 37 is lowered via the rod 38, and at the same time, the weir 16 is gradually submerged below the water surface 8. The weir 16 moves downward about the rotary shaft 31, and during that time, the front seal 35 moves to the inflection part 3
5a elastically deforms to maintain a sealed state, and the side seal 33 maintains a sealed state by sliding while constantly corroding the rotating side plate 30.

When the roller 9 reaches the first-stage protrusion 12a, the weir 16 sinks the most, and then the roller 9 reaches the recess between the front and rear protrusions 12a, so that the weir 16 slightly floats. , And the second stage protrusion 12
When the roller 9 reaches a, the weir 16 is deeply submerged again. As a result, the roller 9 is attached to the protrusion 12a of the first stage.
Swallows even a large scum on the water surface 8 at a time when responding, and pulls even a scum in the distance to a near distance.
Then, when the roller 9 reaches the second-stage protruding portion 12a, the attracted scum is effectively attracted. The weir 16 is returned by the buoyancy of the weir 16 and the weight difference between the Narai arm 12 and the pushing arm 15. However, when the weir 16 is not hollow, for example, when it is a flat plate, the weir 16 may be returned by a return float or may be returned by attaching a weight to the Narai arm 12.

In the embodiment shown in FIG. 5, a front spring means 46 and a rear spring means 47 are provided on the outer surface of the side plate 30, and when the water level rises as indicated by the arrow, the front spring means 46 and the water level also change. When the pressure becomes low, the rear spring means 47 abuts on the seal holding plate 32 to slowly stop the weir 16. The action of the spring at the moving end causes the weir 16 by the front seal 35.
Can help the resistance of.

In the embodiment shown in FIG. 6, a Narai arm 12 is installed at the bottom of a sedimentation pond so that the roller 9 of a flight 7 traveling on the bottom of the pond swings up and down, and the Narai arm 12 is placed above the water surface. It is connected to the pushing arm 15 via an interlocking rod 50. The push-down arm 15 and the lever 42 are connected by an interlocking bar (not shown). Although the Narai arm 12 is provided with a stopper 51 for restricting downward movement, such a stopper 51 may be configured in the embodiment shown in FIG.

The embodiment shown in FIG. 7 is applicable to any of the scum removing devices of the embodiments shown in FIGS. 1 to 5 or the embodiment shown in FIG. 6, and the existing gutter-shaped drain groove 53 is used as a front surface. Only a part is removed, a mortar 55 is applied to the removed portion 54, a mounting plate 56 is fixed thereon, and the front seal 35 and the weir 16 are installed.

In FIG. 8, in view of the presence of a sedimentation basin having a large level change, the weir 16 moves up and down according to the changing water surface 8, while the weir 16 is oscillated up and down with a substantially constant stroke. An example of a water level following type scum removing device is shown. That is, the weir 16 side has a large arc centered on the rotation axis, and the disengagement teeth 58 are provided on the outer periphery.
The engagement / disengagement plate 58 having a ... Is provided so as to follow the fluctuation of the water level together with the weir 16. On the push arm 15 side, an engaging rod 59 is hung so that the pin 59a at the lower end is located slightly above the engaging and disengaging teeth 58a. In the blocking state shown in the drawing, the engaging rod 59 is separated from the engaging / disengaging teeth 58a ...
When the Narai arm 12 is pushed up while 6 follows up and down, the pin 59a meshes with the engagement / disengagement tooth 58a immediately below the pin 59a, and the weir 1 with a constant stroke.
Push down 6.

In the embodiment shown in FIGS. 9 to 11, the weir 16 is floated and lowered by controlling the supply and discharge of water without using the power of the sludge attracting device. That is, as shown in FIG. 9, the weir 16 is configured to be supported by the trough 17 via the rotary shaft as in the above-described embodiment, and the front seal 35 prevents water from entering from the front. . Although the weir 16 is also hollow, the water space 60 is located above the diagonal line of the internal space of the weir 16 and the buoyancy body 61 made of styrene foam or the like remains in the lower part.
Is fixed in. The buoyancy body 61 is used in the water storage space 6
This is to ensure buoyancy even when water is introduced into the zero.

The middle of the operating lever 62 is connected to the tip of the weir 16 via a rod 61, and the lever 6
2 is swingably supported by a fulcrum 63. And
An auxiliary float 64 is attached to the tip of the actuating lever 62, while a spring 65 for biasing the front portion of the lever 62 is provided at the rear portion of the lever 62. Further, a manual lever 66 is erected on the rear end of the lever 62. As described above, a water supply port 69 for introducing the water supply from the water supply control tank 67 through the flexible tube 68 is formed in the weir 16 near the end of the weir 16 as shown in FIG. At the same end, a slit-shaped small amount drainage port 71 whose opening length can be adjusted by the adjusting plate 70 is formed on the left and right so as to face the inside of the trough 17.

As shown in FIG. 10, the tank 67 collects a small amount of water and when it reaches a certain level, it collectively supplies water into the water filling space 60 and pushes down the weir 16. is there. The communication tube 73 is connected to the tank 67.
, A lid 75 with a hole 74 is detachably attached, and a cover plate 76 is provided on the hole 74. A bracket 77 is provided in the tank 67, and a float 80 is attached to the bracket 77 by a shaft 78 and an arm 79 so as to be vertically movable. Further, around the shaft 78, a switching lever 82 with a spring 81 that is converted and moved upward when the internal water level increases from the state shown in the figure is rotatably provided as a V-shaped one. A chain 83 is suspended from the lower end of the lever 82, and a control valve 85 having a floating float 84 is attached to the shaft 86 so as to be vertically movable on the lower end of the chain 83.

As shown by the solid line in FIG. 9, the tank 6 is in the illustrated state in which the water 16 is empty and the weir 16 is lifted.
A small amount of water is continuously supplied into the inside 7 through a water supply port 87 whose water supply amount can be adjusted by a throttle. Control valve 8
Since No. 5 is closed, the level in the tank 67 gradually rises. Then, when the float 80 that rises at the same time reaches a level slightly higher than that shown in the figure, the arm 79 pushes up the upper side of the switching lever 82, and the spring 81 instantly rotates the lever 82 upward, so that the chain 83
Lift control valve 85 via. As a result, water flows into the communication tube 73 all at once, and this is maintained until the water in the tank 67 is completely exhausted by the floating float 84, and finally the float 84 closes the outlet to the communication tube 73. .

When water is supplied from the communication tube 73 into the tank 67, the weir 16 lowers to a certain level due to its weight and attracts scum on the water surface. Since a small amount of water is discharged from the small amount drainage port 71, the weir 16 floats by its own buoyancy as the amount of discharge increases. Figure 9
Auxiliary float 64 and spring 65 restrict excessive weir 16 sinking. The method using the control tank 67 can be applied to all the other scum removing devices described above.

12 and 13, the weir 16 has a water filling space 60, the weir 16 is supported by the rotating shaft 31 on the trough 17 side, and the weir 1 is supported by the front seal 35 and the side seal 33.
6 and the trough 17 are closed, the water supply control tank 67 is detachably fixed on the flange 17b, and a flexible tube 68 from the tank 67 is supplied to the weir 16 via a rotary joint 90. It is connected to the port 69, and a pipe 91, which is a small amount drainage port, is communicated with the lower part of the rear end of the weir 16. This pipe 91
A long drain pipe (or tube) 93 is connected to the pond or the trough 17 via a valve 92 capable of controlling the amount of drainage.
As shown in FIG. 13, each device extends from the weir 16 into the trough 17 to the scum pit at the end, but the end faces the trough 17 where water is supplied and drained, or adjacent or other. It may be extended to the inside of the trough 17. The end opening of the pipe 93 is directed in the direction of the arrow in FIG. 13 (the direction in which scum water flows), so that the scum water is smoothly discharged in synchronization with the flow of the scum water. The scum water flows in the direction of the arrow in the trough 1.
This is because the bottom surface of 7 is slightly inclined in that direction.

Regarding the other constituent points, side plates 30 having partial disk shapes are attached to both ends in the longitudinal direction of the weir 16, and side surface seals 33 obliquely attached to the trough 17 side are always attached to the outer surface of the side plate 30. It comes in contact with them to prevent the ingress of water. The side seal 33 and the front seal 35
And are set in succession to function as a water seal. Reference numeral 19 is a communication trough which penetrates the side wall 1 to support the trough 17 and functions to flow scum water.

In the embodiment shown in FIG. 12 and FIG. 13, the water supply system for the water supply tank 67 is such that the individual pipes are connected from the water supply source to the tank 67 for each settling basin and individual throttle control is performed at all times. A certain amount of water is supplied at the same time. In this case, a single pipe may be extended from the water supply source, and the pipe may be branched to communicate with the tanks 67 installed in a plurality of settling basins so that a fixed amount of water can be secured via the throttle. A valve may be provided on the pipe extending from the tank 67 to the weir 16, and the valve may be interlocked to open and close by a flight that is circulated in the pond. This method will be described in detail in FIG.

In the embodiment of FIGS. 12 and 13, the connection is made via the rotary joint 90, but as shown in FIG. 9, the whole (or part of the weir 16 side) is a flexible tube. It may be something. Further, in the embodiment of FIGS. 12 and 13, control means such as the auxiliary float 64 and the spring 65 may be combined in an appropriate combination.

In the embodiment shown in FIGS. 12 and 13,
The weir 16 had a rectangular cross section, but FIG. 14, FIG. 17, and FIG.
8 or a cross section as shown in FIG. This will also be described later. Further, in the embodiment shown in FIGS. 12 and 13, the water supply port 69 is provided on the tip side of the weir 16, but it may be provided in the middle between the tip and the base or in the vicinity of the base. It is necessary to set the head difference between.

Further, it goes without saying that a plurality of water supply ports 69 may be provided for one scum removing device.
Further, as shown by the plate phantom line in FIG. 12, the tank 67 may be integrally formed at the upper end of the rear part of the trough 17 by partially utilizing the wall plate part of the trough 17. In this case, the arrangement may be either above or below the virtual line.

In the embodiment shown in FIG. 14, the water supply communication port 95 of the weir 16 is opened to one end or the other side in the longitudinal direction of the weir 16 to a large size, and the communication port 95 is provided with a blind lid 96 via packing not shown. Closed at. Since the blind lid 96 is detachable with bolts or the like, for example, as shown by an imaginary line, the blind lid 96 is provided with a thick pipe-shaped water supply port 97 or a slightly finer water supply port 98 according to the convenience of construction. You will be able to choose freely. As shown in the figure, the tip of the weir 16 may be round or may be mountain-shaped (not shown). Further, a member extending like a dam plate in the tip direction may be added.

The embodiment shown in FIG. 15 is a method of coping with the case where the water filling space 60 in the weir 16 is insufficient, and the auxiliary tank 100 is placed on the weir 16 and communicated with each other. The tank 100 has a seal 1 at the water supply port 101.
The weir 16 is connected to the weir 16 near the tip of the weir 16 so as to generate a large rotation moment with the smallest possible tank capacity. The tank 100 may be arranged at a position other than the tip. 103 is a mounting bracket for the tank 100. It should be noted that the auxiliary tank 100 does not hinder the attraction of scum water and has a short width corresponding to the longitudinal direction of the weir 16, or has a gap between the weir 16 and the top and bottom that allows scum water to flow. Set up.

In the embodiment shown in FIG. 16, the water supply port 105 is connected to the weir 16 through the side plate 30.

The embodiment shown in FIG. 17 relates to another shape of the weir 16, which is formed by attaching the cylindrical portion 108 to the tip of the plate portion I07. The cylindrical portion 108 may have other geometric shapes. 33 is a side seal.

In the embodiment shown in FIG. 18, the cylindrical portion 10
8 is a triangular portion 110.

In the embodiment shown in FIG. 19, the weir 16 supported by the rotating shaft 31 has a plate shape, and a tank 112 which is a water storage space is attached to the rear portion thereof, while the weight 11 is provided at the tip.
3 is attached, and when the water in the tank 112 gradually drains, the weir 16 sinks due to the action of the weight 113, and conversely, when water is supplied into the tank 112, the weir 16 comes to float. There is.

The embodiment shown in FIG. 20 is not a control tank 67 as shown in FIG. 10, but a tank 115 having a complete interior space.
Then, a variable throttle 117 is arranged on the supply pipe 116, and a valve 119 is provided on the water supply pipe 118 at the bottom of the tank.
The first lever 121, the link 122, and the second lever 123, which are kicked at 0, are interlocked. That is, when the first lever 121 is kicked, the valve 119 is opened and the stored water in the tank 115 flows into the weir 16. When the flight 120 passes by, the valve 119 is closed by the spring 124 and the stored water in the tank 115 is stored. It is possible. The said structure is comprised for every sedimentation basin.

As shown by the phantom line, in order to open the valve 119 in a shorter time, the link 122 side of the first lever 121 may be made longer. In this case, if the middle of the link 122 is the elastic portion 125, the first lever that further rotates with respect to the second lever 123 that stops after opening.
The movement of the lever 121 can be absorbed by the deformation of the elastic portion 125.

In the embodiment shown in FIG. 21, the valve 119 is used.
The other means for interlocking the opening and closing is such that one magnet 128 is attached to the flight 127 side and the other magnet 129 is attached to the lower end of the rod 130 that vertically responds, and the magnets 128 and 129 repel each other. By doing so, the valve 119 is opened and closed. The rod is returned by a spring and is also provided with a stopper 131. As shown by a virtual line, a magnet 129 may be attached to the tip of the swing lever 132 so as to be interlocked.

The embodiment shown in FIGS. 22 and 23 shows another device installed in a rectangular sedimentation basin or a circular sedimentation basin for collecting and removing floating scum. A rectangular fixed frame 136 is fixedly installed via the guide frame 137, and a pair of upper and lower guide rollers 137 are arranged on each inner side of the fixed frame 136. Inside thereof, a trough 138 having a rectangular plane and a saucer shape is provided, and the trough 138 has a hollow shape.

At the upper edge of this trough 138, the water supply port 13
9, a water supply pipe 140 is connected and provided, while a drain pipe 143 provided with a flexible portion 141 and a valve 142 is connected and connected to the center of the bottom surface of the trough 138. The valve 142 is opened and closed by a lever 145 with a spring 144.

When the trough 138 is supplied with water, the upper surface of the trough 138 sinks below the surface of the water to attract scum. At this time, the trough 13
8 is lowered horizontally by a stabilizing float 134 attached to the outer periphery thereof. The scum is removed through the drainage pipe 143. The trough 138 moves up and down smoothly by the guide roller 137, and when descending, the valve 142 is moved through the lever 145.
Open at the same time, and scum water is led to the drain pipe 143.
The water inside the trough 138 is a small drainage port 1 that opens to the inner circumference of the bottom.
As a result of being gradually removed through the drain pipe 143 through 46, the trough 138 gradually rises and stops attracting scum.

The embodiment shown in FIG. 24 has a circular shape, whereas the above-mentioned embodiment has a rectangular shape. The reference numerals are the same as those in the above embodiment.

In the embodiment shown in FIG. 25, a weir 150 movable up and down by a seal 149 is provided on one side of a fixed trough 148 in the shape of a U-shaped plane, and the weir 150 itself is made hollow to supply and drain water. It is designed to be moved up and down by. 151 is a water supply port.

The scum removing device of each of the above-described embodiments is applicable to a circular sedimentation pond or the like as well as a rectangular sedimentation pond, and the same device can be installed in rivers and lakes. Is.

[0057]

According to the invention described in claim 1, since the fixed trough and the movable weir are divided and sealed between them and the weir is configured to be freely movable, no worker for removing the scum is required. As a result, the operation is reduced, and smooth and reliable operation can be obtained.

According to the second aspect of the present invention, the weir in the above configuration is configured to be driven by utilizing the power of the sludge attracting device or the like that circulates inside the sedimentation basin or the like.
The device can be provided at low cost without the need to newly install a power source for driving the weir.

According to a third aspect of the present invention, in the first aspect, the means for driving the weir is a water driving system for introducing and discharging water into the space formed inside the weir. Can be unitized together with the apparatus main body such as a trough and a weir, whereby the work from production to construction can be performed efficiently and reliably.

According to a fourth aspect of the present invention, in any one of the first to third aspects, since the weir is swingably supported on the trough side via a horizontal axis-shaped rotation center, the weir is positioned above and below the weir. The movement is reliable and smooth with respect to the defined rotation axis, and is also highly durable.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the seal is formed between the weir and the trough vertically and between the side surfaces, and the upper and lower seals are made of an elastic material. Since the weir is mounted on each of the weir and the trough, the tightness between the upper and lower sides and the side surfaces can be fully exerted with durability without impairing the operability of the weir.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a scum removing device according to an embodiment of the present invention, taken along line II-II in FIG.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is an exploded perspective view of a rotation support portion of the weir.

FIG. 5 is a side sectional view showing another embodiment.

FIG. 6 is a side sectional view showing an embodiment of a pond bottom drive system.

FIG. 7 is a side sectional view showing an embodiment installed in an existing drainage ditch.

FIG. 8 is a side sectional view showing a water level following type scum removing device.

FIG. 9 is a side sectional view showing a scum removing device using a water drive system.

FIG. 10 is a cross-sectional view showing the internal structure of the water supply tank.

FIG. 11 is a plan view of FIG.

12 is a cross-sectional view of FIG.

FIG. 13 is a plan view of FIG.

FIG. 14 is a cross-sectional view showing another embodiment in which the weir is provided with a closing lid so that the water supply port can be selected.

FIG. 15 is a cross-sectional view showing another embodiment in which the weir is provided with an auxiliary tank.

FIG. 16 is a sectional view showing another embodiment in which water is supplied through a side plate.

FIG. 17 is a schematic diagram showing a modified example of the weir.

FIG. 18 is a schematic view showing a modified example of the weir.

FIG. 19 is a schematic view showing a modified example of the weir.

FIG. 20 is a schematic view showing an embodiment in which a water supply valve is opened and closed in conjunction with flight.

FIG. 21 is a schematic view showing another embodiment in which a water supply valve is opened and closed in conjunction with flight.

FIG. 22 is a plan view showing another embodiment of the water supply / drainage type scum removing device.

23 is a vertical cross-sectional view of the device of FIG.

FIG. 24 is a plan view of a circular water supply / drainage type scum removing device.

FIG. 25 is a plan view of a scum removing device provided with a water supply / drainage type weir on one side.

[Explanation of symbols]

3 ... Sludge attracting device, 8 ... Water surface, 10 ... Scum removing device,
16 ... Weir, 17 ... Trough, 31 ... Rotating shaft, 33, 35 ...
A seal, 60 ... Water storage space, 69 ... Water supply port, 71 ... Small amount drainage port.

Claims (5)

[Claims] 1. A trough having a trough shape fixedly installed inside a sedimentation pond or the like and provided with a portion lower than the water surface on at least one side thereof, and a trough provided on the one side of the trough above and below the water surface. A scum removing device comprising: a movable weir; a seal for preventing water from entering between the weir and the trough; and means for driving the weir. 2. The scum removing device according to claim 1, wherein the means for driving the weir is a power source such as a sludge attracting device that circulates inside a sedimentation basin or the like. 3. The means for driving a weir as set forth in claim 1, wherein water is introduced into a space formed inside the weir so as to be retained, and the introduced water is floated and sunk by being withdrawn little by little. A scum removal device that is configured. 4. The scum removing device according to claim 1, wherein the weir is swingably supported on the trough side via a horizontal axis of rotation. 5. The seal according to any one of claims 1 to 4, wherein the seal is formed between the weir and the trough in the vertical direction and between the side surfaces, and the upper and lower seals are made of an elastic material. A scum removal device installed on each of the.