JPS5843126B2 - Scraping device for multilayer sedimentation tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scraping device installed in a lower tank of a multilayered sedimentation tank, and more particularly to a device for scraping off sediment and, in particular, scraping off scum adhering to the ceiling surface of the lower tank.

With the increase in urban population, the spread of sewage systems, and improvements in living standards, the amount of water treated at sewage treatment plants has increased, and multilayer sedimentation tanks have come into widespread use.

Conventional heavy-duty sedimentation tanks have sedimentation tanks stacked one on top of the other, and each sedimentation tank is equipped with chains on both sides of the pond that rotate over approximately the entire length of the pond, and scraping plates are attached to these chains to raise the bottom of the pond. A raking machine is provided for raking.

In the sedimentation tank on the top layer, a support guide for a scraping plate is installed along the water surface to scrape up the floating sludge on the water surface.

However, the lower sedimentation tank is filled with water up to the ceiling, and the ceiling cannot be built flat. Become.

Therefore, the sludge adhering to the ceiling can hardly be scraped off, and forms an accumulated layer of sludge, which is peeled off from the ceiling in a plate shape by the putrid gas after a period of time.

There was a drawback that the peeled plate-like sludge mixed into the supernatant water of the sedimentation tank and contaminated the treated water.

In addition, providing a separate scraper in the pond for scraping the sludge will agitate the water flowing into the pond, impairing the effectiveness of the sedimentation treatment.

In view of the above-mentioned drawbacks, this invention has a sediment scraping machine equipped with a scraping plate that operates independently of the sediment scraping plate provided on the chest of the sediment scraper, and scrapes the sediment scraper in contact with the ceiling of the lower pond. The purpose is to provide a raking machine that is flexible.

The purpose of this invention is to fix sediment scraping plates at approximately equal intervals to an endless band that rotates along the bottom and ceiling of the lower sedimentation tank over approximately the entire length thereof, and to A small sludge scraping board is attached to the pond so that it can be swung freely, and the bottom of the pond is scraped with the sediment scraping board, and the ceiling is scraped with the floating sludge scraping board.

The configuration of an embodiment of this invention will be explained based on the drawings.

Figure 1 shows a multi-layer sedimentation tank that forms two layers.

The lower sedimentation tank 1 has a pair of wheels 2 at the top and bottom near its front and rear ends, which are a drive wheel 2a, a ceiling driven wheel 2b1, a take-up wheel 2c, and a bottom driven wheel 2.
d, and an endless chain 73 is rotatably suspended from these wheels 2.

In addition, the sedimentation tank 1 has a bottom rail 4 and a support rail 5 along the ceiling.
A guide rail 6 is provided near the take-up portion, and sediment scraping plates 7 fixed to the endless check 73 at approximately equal intervals are in contact with the guide rail 6.

FIG. 2 is a diagram showing the installation of the scraping board, in which a bearing 8 is provided on the chino 3, an arm 9 is pivotally pivoted to the bearing 8, and the arm 9 is
A floating scraper plate 10 having a specific gravity smaller than that of the treated water and larger in height than the sediment scraping plate is installed.

Next, the effect will be explained.

When the Cheno 3 moves in the direction of the arrow in the lower sedimentation tank 1 in FIG. Due to the buoyancy, the arm 9, which is pivoted to the bearing 8, is rolled over, and the side of the arm is
be in contact with

Next, while the floating scraping plate 10 passes from the pond bottom driven wheel 2d to the outside of the driving wheel 2a, its buoyancy causes the arm 9 to
The text is written above the bearing 8 with the axis as the axis.

When the floating sludge scraping board 10 reaches the lower surface of the ceiling, the tip that protrudes higher than the sediment raking board 7 comes into contact with the ceiling, and scrapes up the floating sludge while tilting to the opposite side of the traveling direction of the Cheno 3. .

After passing the ceiling driven wheel 2b, I will write again, and
When the float is released and passes outside the take-up wheel 2C, it is gradually tilted and overturned by the cheno 3.

The overturned floating sludge scraping board 10 allows the sediment scraping board 7 to come into contact with the rail 4.

As described in the structure and operation above, the present invention has a buoyant sludge raking plate swingably provided on the chest of the sediment raking machine, thereby making it possible to scrape sludge on the ceiling surface with a simple structure. You can take it.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a multi-layer sedimentation basin formed in two layers, and FIG. 2 is an enlarged view showing details of the installation of the scraping board. 2.2 a, 2 b, 2 c, 2 d: wheel, 7: sediment scraping board, 8: bearing, 10: floating scraping board.

Claims (1)

[Claims] 1. In a sediment scraping device in which a sediment scraping plate is attached to the lower tank of a multi-layered sedimentation tank and is rotatably provided with an endless band, a bearing is protruded from the endless band, and the specific gravity of the bearing is higher than that of the processing liquid. A scraping device for a multi-layer sedimentation basin, characterized in that a small floating scraping plate is pivoted so as to be swingable, and the center of buoyancy of the floating scraping plate is spaced apart from the pivot shaft.