JPS5853596B2 - Scum removal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scum removal device that scoops and removes scum floating on a liquid surface.

For example, it is necessary to remove scum floating on the water surface in a sedimentation tank, thickening tank, or washing tank in a water treatment system.

Conventionally, to explain the example of a circular sedimentation tank shown in FIGS. 1 and 2, a scum box 2 is provided at one location on the outer periphery of a tank 1 into which scum flows together with surface water, and a scum box 2 is provided above the water surface of the tank 1. An arc-shaped scum scraping plate 3 that rotates between the centers of the tank is provided, and the scum scraping plate 3 collects the floating scum spread throughout the tank 1 to the outer periphery. The scum is moved by 12 positions of the scum pock.

However, in reality, since the rotational speed of the scum scraping plate 3 was slow, the scum did not move to the outer periphery, and therefore the scum was not removed effectively.

For Figures 1 and 2, 4 is the supernatant water outflow trough;
5 is a baffle plate that prevents scum on the water surface from flowing into the supernatant water outflow trough 4; 6 is a sludge scraping plate attached to a rotating shaft 8 connected to a drive motor 7 and located at the bottom of the tank 1; The scum scraping plate 3 is connected to this sludge scraping plate 6 and is rotated.

9 is a wastewater inflow pipe, and 10 is a center well.

An object of the present invention is to provide a scum removal device that can effectively remove scum that spreads and floats on the liquid surface of a tank.

An embodiment in which the present invention is applied to a circular sedimentation tank of a sewage treatment device will be described below with reference to FIGS. 3 to 5.

Components that are substantially the same as those in the conventional example will be given the same numbers and will not be described further.

Reference numeral 11 denotes a cylindrical body extending radially from the center of the tank 1 and rotating six times around the inside of the tank.

This cylindrical body 11 consists of a cylindrical body 12 having an elliptical cross section, end plates 13a and 13b that close both longitudinal ends of the cylindrical body 12, and support shafts 14a and 14b projecting from the end plates, respectively.

Each support shaft 14a. 14b are provided above the same axis that is eccentric from the centroid position of the cross section of the cylindrical body 12.

One support shaft 14a has an upper edge of the center well 15 supported by a removable wheel 18a, and a bevel gear 16 at the tip.
is installed.

This bevel gear 16 (ri) meshes with a ring-shaped bevel gear 17 fixed to the rotating shaft 8.

A wheel 18b is attached to the tip of the other support shaft 14b, and this wheel 18b connects to an annular receiver disposed inside the supernatant water outflow trough 4 at the outer periphery of the tank 1. It is supported on the upper edge of the rising piece 20 so that it can be moved freely.

The cylinder 12 is provided on the peripheral wall of the cylinder 12 near the maximum diameter position M where the distance from the axis t of both the support shafts 14a, 14b is maximum.
2 is formed with a long hole 21 extending almost the entire length thereof, and the end plate 18b located on the side of the receiving gutter 19 has both support shafts 14a.
, 14b is formed with an opening 22 facing the gutter 19 at a position corresponding to the minimum diameter position N at the minimum distance from the axis t of the bearing.

According to the above configuration, when the rotation shaft 8 is rotated by the drive motor 7, the ring-shaped bevel gear 17 rotates together with the sludge scraping plate 6, and this ring-shaped bevel gear 17 rotates around the support shaft 8 of the cylindrical body 11.
Because it meshes with the bevel gear 16 at the tip of 4a, the cylindrical body 11
is the support shaft 14a.

The wheel 1 rotates around the axis t of the wheel 14b.
It revolves by the rolling of 8a and 18b.

Every rotation of this cylindrical body 11.01 times, the scum floating on the water surface is taken into the cylindrical body 11 through the elongated hole 21 along with the surface water, and then the scum is discharged into the gutter 19 through the opening 22. ,
This action is repeated as it revolves.

That is, in the state shown in FIG. 5a, the maximum diameter position M of the cylindrical body 11
Since the elongated hole 21 is located above and the minimum diameter position N is located below, water containing scum accumulated at this minimum diameter position N flows out from the opening 22 to the gutter 19 as shown in FIG. .

Subsequently, as the cylindrical body 11 rotates, it changes from the state shown in FIG. 5 to the state shown in FIG. 5C.

In this state, the maximum diameter position M of the cylindrical body 11 and the elongated hole 21 are located below, and at least a part of the innermost hole 21 is submerged under the water surface, so that the surface water is absorbed into the elongated hole 21 along with the scum on the water surface. It flows into the cylindrical body 11 from the inside and accumulates at the maximum diameter position N.

As the cylindrical body 11 further rotates, it returns to the state shown in FIG. 5a through the state shown in FIG. 5d.

The cylindrical body 11 revolves while repeating this operation, and thus the scum floating on the entire water surface of the tank 1 is effectively removed.

The embodiment shown in FIG. 6 is basically the same as the embodiments shown in FIGS. 3 and 4, except for the configuration of the device for making the cylindrical body 11 revolve and rotate, and only the different parts will be explained.

One support shaft 14a of the cylindrical body 11 is rotatably supported via a bracket 32 and a bearing 33 by a center cage 31 that rotates around a center post 301 erected in the center of the tank 1, and its tip is vertical. It is connected to the output shaft of a gearbox 34 having an input shaft of direction.

A gear box 34 is attached to the center cage 31, and a sprocket 35 is attached to its input shaft.

A chain 36 is attached to the outer periphery of the upper end of the center post 30 in an annular shape, and the sprocket 36 meshes with the chain 36.

A rotating body 37 having an internal gear 38 rotatable around the center post axis is provided at the upper end of the center post 30, and the center cage 31 is connected to the rotating body 37.

Further, a driving pinion 40 connected to a driving device (not shown) installed on a top plate 39 at the upper end of the center post 30 meshes with the internal gear 38 .

In this configuration, the center cage 31 rotates due to the rotation of the drive pinion 40, and the cylindrical body 11 revolves accordingly, and the sprocket 36 meshing with the chain 36 rotates with the revolution, so that the cylindrical body 31 rotates. The body 11 will rotate.

In the above description of the embodiment, a case has been described in which a cylindrical body extending in the radial direction is rotated while rotating in a circular tank. It can also be configured to rotate while moving along the other side.

In short, it is sufficient to rotate the cylindrical body while moving it along the water surface.

In addition, as an example of a cylindrical body, we have shown one with a circular cross-sectional area and a rotational axis eccentric from the centroid, but if the cross-sectional shape is elliptical, egg-shaped, or rectangular, and has a major axis and a minor axis, The same effect can be obtained even if the rotation axis is at the centroid position, and even if the cross-sectional shape is circular or regular polygon, the same effect can be obtained by making the rotation axis eccentric from the centroid position. The cylindrical body may have various cross-sectional shapes.

According to the present invention, as is clear from the above description, after the scum on the liquid surface is taken into the cylindrical body by rotating the cylindrical body, the receiver repeatedly discharges the scum into the gutter. By moving this cylindrical body along the liquid surface, the scum that spreads and floats on the liquid surface can be effectively removed.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional front view of the conventional example, and Figure 2 is from ■ to ■ in Figure 1.
FIG. 3 is a longitudinal sectional front view of an embodiment of the present invention;
4 is an enlarged vertical sectional front view of the main part of FIG. 3, FIG. 5 is an explanatory diagram of the operation, and FIG. 6 is an enlarged longitudinal sectional front view showing the main part of another embodiment of the present invention. 1... Tank, 11... Cylindrical body, 12...
... Cylinder body, 13a, 13b ... End plate, 14
a, 14b...Support shaft, 15...V center well, 16...Bevel gear, 17...
Ring-shaped bevel gears, 18a, 18b...wheels, 1
9...Receiver is gutter, 21...Long hole, 22.
・・・・・・Opening 0.30・・・・・・Center post, 3
1... Center cage, 33... Bearing, 34... Gear box, 35... Sprocket, 36... Chain.

Claims (1)

[Claims] 1. A cylindrical body having a circumferential wall whose distance from the rotation axis changes and whose both ends are closed is provided to be rotatable and movable along the liquid surface, and the distance of the cylindrical body circumferential wall from the rotation axis is A long hole is provided in the vicinity of the maximum position, and an opening is provided at or near the position of the minimum distance from the rotation axis on the outer periphery of the end wall of the cylindrical body, and a gutter is provided along the movement path of the opening. A scum removal device characterized by: