JPS584635Y2 - Scum removal equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for removing scum floating on the water surface of a sedimentation tank in a sewage treatment equipment. This paper proposes a scum removal device that can simultaneously discharge scum.

An embodiment of the present invention will be described below based on the drawings.

Figures 1 and 2 show the overall structure; 1 is a sedimentation basin;
Reference numeral 2 denotes a rotary drive shaft provided in the center of the sedimentation tank 1, and is rotated via an electric speed reducer 3.

Reference numeral 4 denotes a center well provided on the upper part of the rotary drive shaft 3, and from the periphery of the center well, a scum scraping plate 5 positioned at a level equivalent to the water surface of the sedimentation tank extends in a radial direction about the shaft 2.

A scum box 6 is installed around the periphery of the sedimentation tank 10, and is located directly below the movement trajectory of the tip of the scum scraping plate 5. A scum discharge pipe 7 connected to the bottom communicates with the scum pit 8. There is.

The top surface of the scum box 6 is open and is set to be always above the water surface.

Reference numeral 9 denotes a sludge scraping plate whose lower end is provided at a position where it is almost in contact with the bottom surface of the sedimentation tank 2, and is attached to the lower part of the rotary drive shaft 2 and fixed to the frame 10 extending in the radial direction.

11 is a sludge pin provided at the center bottom of the settling tank 1.

3 and 4 show the detailed structure of the scum box 6. For example, the upper edge of the front surface of the scum box 6 on the side where the scum scraping plate 5 approaches has a front opening 12 extending to an appropriate depth. A horizontal shaft 13 is provided in the front opening 12.
A water wheel 14 is fitted in through.

The water wheel 14 has, for example, six blades 1 fixed to a horizontal shaft 13.
5, each blade 15 is configured to slide around the front opening 12, and the two blades 15 arranged in a straight line with respect to the center are connected to the front opening 12 as shown in FIG. is closed, and the tips of the upper blades 15a protrude above the water surface.

Next, its operation will be explained.

As shown in FIG. 1, the scum scraping plate 5 is curved so that its tip becomes retarded, and as it rotates around the rotary drive shaft 2, scum on the water surface is collected at its tip. The collected scum passes above the scum box 6.

The upper blade 15 of the scum scraping plate 5 projects above the water surface.
When the front opening 12 is rotated in the direction of the arrow, the closed state of the front opening 12 is released, and the scum that has been gathered above the scum box 6 by the scum scraping plate 5 is removed from the surface layer flowing through the front opening 12. The scum is discharged together with water to the scum pinto 8 through the scum discharge pipe 7.

When the scum scraping plate 5 has finished passing, the next blade 15 is in a substantially vertical position as shown in FIG. 4, and the opening 12
will be blocked.

FIG. 5 shows another embodiment, in which the water turbines 20 are arranged at right angles to each other.
It has two blades 21, and the scum scraping plate has the upper blade 21.
When the blade 21a hits point a, the blade 21a is pushed by it and rotated by a predetermined angle, and then is forcibly rotated to a horizontal position by its own force.

This is, for example, a modified pincushion-shaped cam 2 in which the concave portion is biased to one side.
2 is fixed to the transverse shaft 23 of the water wheel 20, and this can be achieved by forced rotation through 90°, such as by biasing it with a spring body 24 directed from a symmetrical position toward the center.

In addition, in the embodiments of FIGS. 3 and 4, 600 forced rotation means may be added.

As described above, according to the present invention, when the scum scraping plate scrapes up scum above the scum box, the water wheel is rotated by the power of the scum scraping plate, the front opening is unblocked, and the scum is removed. Since it is discharged together with the surface water that flows in through the front opening, there is no need for separate power or external force to rotate the water wheel.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are a plan view and a vertical sectional view showing the overall configuration, and FIGS. 3 and 4 are a partially sectional front view and a partially sectional view showing the main parts. A cutaway side view and FIG. 5 are perspective views showing essential parts of another embodiment. 1... Sedimentation pond, 5... Scum scraping board,
6...Scum box, 7...Scum discharge pipe, 12...Front opening, 13.23...
...horizontal axis, 14,20...water wheel, 15,2
1... Feather.

Claims (1)

[Scope of utility model registration request] A scum box whose top opening is located above the water surface below the movement path of the scum scraping plate and whose bottom part is connected to the scum discharge pipe is provided in the sedimentation tank, and the front surface of the scum box on the side where the scum scraping plate approaches is provided. A front opening is provided at an appropriate depth from the upper edge, a water wheel is fitted into the front opening via the horizontal shaft, and at a predetermined rotational position of the water wheel, the front opening is closed by the blades of the water wheel. A part of the blade protrudes above the water surface, and when the scum scraping plate hits and pushes the blade protruding above the water surface, the blocked state is released, and when the scum scraping plate passes, the next A scum removal device characterized in that the scum removal device shifts to a closed state.