JPH0220072Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scum skimmer that automatically removes scum in a settling basin as the sludge scraper moves in flight.

[Conventional technology and its problems]

Scum skimmers in sedimentation basins are generally opened and closed manually, and this opening and closing operation is performed regularly by workers. This has the disadvantage that it requires too much effort on the part of the workers. In recent years, with the trend toward automation in treatment plants, there has been a demand for scum skimmers that can be easily retrofitted to existing equipment. In order to solve this problem, a method has been proposed in which the opening and closing operations are performed by electric or hydraulic operation separate from the drive source of the sludge scraper, but this method is unsuitable from the viewpoint of energy saving.

The object of the present invention is to automatically open and close a scum skimmer without using any other power.

[Means to solve the problem]

In order to achieve the above purpose, this invention uses a water collection gutter,
a flexible weir attached to the upper part of the water collection gutter and provided at least on the upstream or downstream side of the scum skimmer; a push rod connected to the upper part of the flexible weir and moving the flexible weir up and down; It consists of a lever that moves the push rod up and down by the driving force obtained by the movement of the flight when it comes into contact with the flight, thereby automatically using the power of the sludge scraper without relying on any other power source. The flexible weir is opened and closed to remove floating scum.

〔Example〕

The present invention will be explained below based on drawings of embodiments.

In the figure, 1 is a sedimentation tank, and 2 is a scum scraper installed in the longitudinal direction of this sedimentation tank or in any direction. A large number of flights 23 are arranged at regular intervals or arbitrary intervals,
Flight 2 for the sludge scraper is driven by this chain.
In step 3, the scum floating on the water surface is collected toward the pond end and other scum removal positions. Of course, during this scum scraping, the flight is in the floating position. Of the total number of flights 23, the operating piece 3 is provided protruding from one or several of them.

In addition, lever 4 is placed slightly above the water surface of sedimentation tank 1.
Place. One end of this lever 4 is in contact with the striker 3, and its intermediate portion is swingably provided via a bearing 5 on a shaft 6 protruding from the pond side wall or the fixed side.
A flight without an operating piece protruding from the flight can be brought into contact with the lever, and push rods 8, 8 are provided at the end of the lever 4 via a shaft 7.

Next, a water collection gutter 11 is provided on the downstream side of this lever, and flexible weirs 10, 10 are provided on the upper side of this water collection gutter 11 on the upstream and downstream sides, respectively. In this embodiment, the flexible weir is provided on both the upstream and downstream sides of the water collection gutter, but it is also possible to provide it on only one side.
These flexible weirs 10, 10 are connected to the above-mentioned push rods 8, 8 via a shaft, and are set at a position slightly higher than the normal operating water level, so that when the flexible weirs 10, 10 are bent downward, they are submerged under the water surface. death,
Sewage is made to flow into the water collection gutter 11.

This lever 4 is rotated around a shaft 6 by a striker 3 attached to a flight 23, as shown by the chain line in FIG. .

Thus, in the scum skimmer having the above-mentioned configuration, the flight moves on the water surface by driving the flight, and gathers the scum on the water surface toward the scum skimmer. When the striker attached to flight 3 contacts lever 4 and pushes lever 4 up, bearing 5
The push rods 8, 8 are pushed down via the shaft 7. Next, Pushrod 8,
The flexible weirs 10, 10 connected to the dam 8 through the shaft 9 are bent to allow the scum on the water surface to flow into the scum skimmer body.

Next, when the flight 3 passes the contact point with the lever 4, the lever pushing force by the striker is released, and the weight of the lever 4 pushes the push rods 8, 8.
The flexible weirs 10, 10 are lifted up through the dams, and the inflow of floating scum is prevented. In this way, the scum floating on the upstream and downstream sides of the scum skimmer flows into the water collection gutter and is removed every time the lever of the flight striker is lifted. Different embodiments will be explained based on the drawings of FIGS. 3 to 5. This example is a water level tracking type scum skimmer that responds to water level fluctuations.
In addition to the above-described configuration, a fixed weir 12 that covers the upstream and downstream sides of the water collection gutter 11 is fixedly installed on the water collection gutter.

Furthermore, floats 15 are provided on the upstream and downstream sides of the fixed weir 12, and the floating weir 13 is provided on the float 15 to be guided by a weir guide 14 protruding from the fixed weir 12.

The float moves up and down according to the water level, and the floating weir is slidably moved up and down in the notch of the fixed weir 12. That is, if the floating weir 13 is attached to a float with the distance between the upper part of the floating weir 13 and the water surface set to H, floating scum at a distance of H will always flow into the fixed weir 12 even if the water level fluctuates.

Accordingly, a required amount of floating scum flows into the fixed weir depending on the water level. Further, due to the bending of the flexible weir within the fixed weir, the floating scum flows into the scum skimmer body.

The floating weir 13 forms a channel with a depth of H below the liquid level regardless of the water level due to the buoyancy of the float. This is formed regardless of the state of the flexible weir.

On the other hand, with a flexible weir, the scum skimmer is closed and the water level is raised above the liquid level (the water level fluctuates, but it is always raised just above the liquid level, and the water level fluctuation is usually 100 to 200 mm, and at the lowest water level, it is only 100 to 200 mm + α) On the other hand, the flexible weir is pushed down below the top of the floating weir at the lowest water level when the scum skimmer is open.
Then, the water in the area surrounded by the fixed weir 12 and the floating weir 13 is first drained into the water collection gutter 11, and then the water outside the area is brought into the area using the gap H on the floating weir 13, accompanied by scum. flows into. As described above, by moving the flexible weir up and down, the water in the area surrounded by the floating weir and fixed weir is discharged or stopped, and the floating weir is always set at a predetermined water level to scum. The skimmer can be opened and closed.

[Effect of idea]

According to the present invention, since the lever is swung by the drive of the flight, no separate power is required for the scum skimmer, and scum floating on the upstream and downstream sides can be simultaneously removed.

[Brief explanation of drawings]

1 is a front view, FIG. 2 is a plan view, FIG. 3 is a front view of another embodiment, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a side view of FIG. 3. 1 is a sedimentation tank, 2 is a scum scraper, 23 is a flight, 3 is a striker, 4 is a lever, 5 is a bearing,
6 is the shaft, 7 is the shaft, 8 is the push rod, 9 is the shaft,
10 is a flexible weir, and 11 is a water collection gutter.

Claims (1)

[Scope of utility model registration request] In a sludge scraper that moves on the water surface and scrapes up floating scum with a flight attached to the chain of a chain conveyor, and collects the scum with a scum skimmer on the downstream side, the scum skimmer is connected to a water collection gutter, A flexible weir attached to the upper part of the water collection gutter and provided on at least one of the upstream or downstream side of the scum skimmer, and connected to the upper part of the flexible weir,
A scum skimmer comprising a push rod that moves up and down a flexible weir, and a lever that comes into contact with the flight and moves the push rod up and down by the driving force obtained by the movement of the flight.