JPS5933512Y2 - helical scum skimmer - Google Patents

Description

[Detailed explanation of the idea] This idea is related to helical scum skim.

During the sewage treatment process, floating debris called scum is generated in settling ponds and sludge digesters.

This scum forms a layer on the surface of sewage and reduces the efficiency of sewage treatment, such as by blocking the generation of gas, and therefore various devices and devices have been proposed to remove this scum.

A helical scum skimmer is a device for removing this scum, and usually has a structure as shown in FIGS. 1 and 2.

A shaft 50 is rotated by a drive device 51.

A helical scraping plate 52 twisted by half a turn is attached to the shaft 50 via a support member 55.

This shaft 50 is attached to the upper surface of the processing tank A, and the scraping plate 52 scrapes up the scum.

The collected scum falls into an outflow trough 53 provided in the processing tank A in parallel with the shaft 50, and is further discharged from a discharge pipe 54.

In the conventional edge scum skimmer like the above structure s, the scum moves from the right to the left in FIG.
2, an outflow trough 53 is formed at the side wall B.
However, at this time, the scum escapes from the gap between the scraping plate 52 and the side wall B, resulting in a disadvantage that the scum scraping efficiency is reduced.

The present invention was developed to improve this drawback, and is characterized by providing a donut-shaped disk at the end of the scraping plate in the scraping direction, thereby preventing the scum from escaping.

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

FIG. 3 is a front view, and FIG. 4 is a side view of the scraping board, in which the same parts as in FIG. 1 are given the same numbers.

1,1 is a scraping plate, and in this embodiment, the shaft 5
It is fixed by a support member 2 in a 180-degree symmetry with respect to 0.

The shaft 50 is rotated in the direction of the arrow by a drive device 51,
The scum is collected from the right to the left in FIG.

A donut-shaped disk 3 is provided concentrically with the shaft 50 at the end of the scraping plate 1 in the scraping direction, that is, at the left end in FIG.

It is preferable that the width W of the disk 30 is larger than the width Z of the scraping board 1, so that the effect of preventing scum from escaping is greater.

With the above configuration, when the shaft 50 rotates and the scraping plate 1 scrapes up scum, the scum is scraped from the right to the left in FIG. 3 and is dropped into the outflow trough 53.

At this time, the donut-shaped disk 3 ensures that the scum does not fall through the gap with the side wall B and falls into the outflow trough 53. As explained above, according to the lip scum skimmer of the present invention, the scum is scraped up. Since the scum does not escape from between the plate and the side wall, it has the effect of improving the efficiency of scraping up the scum.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional helical scum skimmer, FIG. 2 is a side view, FIG. 3 is a front view of an embodiment of the helical scum skimmer according to the present invention, and FIG. 4 is a side view of a scraping plate. DESCRIPTION OF SYMBOLS 1... Scraping board, 2... Supporting material, 3... Donut-shaped disk, 50... Shaft, 51... Drive device,
53...Outflow trough.

Claims (1)

[Scope of utility model registration request] A helical scum skimmer characterized in that a donut-shaped disc is provided at the end in the scraping direction.