JPS5832793Y2 - Sludge scraping device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sludge scraping device that scrapes sediment deposited at the bottom of a circular settling tank into a sludge pit, and in particular, a rotating scum that captures scum floating on the water surface scraped by a scum schema. This invention relates to a sludge scraping device equipped with a box.

Conventionally, a rotary scum box provided in a sludge scraping device is arranged parallel to the rotation direction of a scum schema that scrapes up scum floating on the water surface.

For this reason, the rotary scum box cannot be made long, resulting in problems such as poor scum removal efficiency.

The present invention was devised to solve these conventional problems, and its purpose is to provide a sludge scraping device that can improve scum removal efficiency.

This invention focuses on the fact that the conventional rotating scum box is arranged parallel to the rotation direction of the scum schema, which makes it impossible to make the scum box long and has poor scum removal efficiency. The rotary scum box is arranged so as to form a chord with respect to the scum schema, that is, substantially perpendicular to the direction of rotation of the scum schema, thereby ensuring a sufficient length of the rotating scum box.

Hereinafter, the present invention will be explained based on an illustrative embodiment.

In Figures 1 to 4, 1 is a circular sedimentation basin;
This sedimentation tank 1 is provided with a sludge pit 2 at the center of its bottom, and a girder 3 is arranged at its upper opening.

A drive shaft 4 is suspended from the center of the girder 3, as shown in FIG. An arm 5 is attached for use.

On the other hand, at the water surface W and L positions on the inner surface of the settling tank 1, a square drainage pit 6 is provided as shown in FIG. 2, and an overflow plate 7 is provided at the upper end of the inner wall. At the same time, a baffle plate 8 is arranged inside the overflow plate 7.

The supernatant water of the raw water is configured to pass through the lower part of the baffle plate 8 and flow out from the overflow plate 7 to the drainage pit 1-6.

As shown in FIG. 2, a cylindrical straightening cylinder 9 that opens downward is fixed to the water surface W and L position of the drive shaft 4, and raw water is supplied to this straightening cylinder 9 through a raw water inlet pipe 10. is configured to be

As shown in FIG. 1, a scum schema 11 having a roller 12 at its tip is protruded from the outside of the straightening tube 9, and the scum floating on the water surface W, L is collected in a rotary scum box 13.
It is structured so that it can be scraped up to.

The rotary scum box 13 is formed into a cylindrical shape having a plurality of openings 14 in the longitudinal direction as shown in FIGS. As shown in FIG. 5, a lever 15 that also serves as a weight is provided in a protruding manner.

The lever 15 is curved along the direction of rotation of the scum schema 11, as shown in FIG.

The rotary scum box 13 configured in this way is arranged so as to form a chord with the circular sedimentation tank 1, as shown in FIG. It is normally attached to the sedimentation tank 1 so as to be rotatable around an axis with the opening 14 facing upward.

The roller 12 at the tip of the scum schema 11 is the fourth
As shown in FIG. 5 and FIG. It is composed of

As shown in FIG. 5C, the rotary scum box 13 is configured to rotate using a lever 15 as a weight and return to its original state after passing through the scum schema 11.

In the above configuration, raw water is first sent to the sedimentation tank 1 via the raw water inflow pipe 10 when treating wastewater.

The sludge accumulated at the bottom of the settling tank 1 is scraped into the sludge pit 2 by rotating the arm 5, and the supernatant water is discharged from the overflow plate 7 to the drainage pit 6 through the lower part of the baffle plate 8.

On the other hand, the scum 16 floating on the water surfaces W and L is prevented from flowing out from the sedimentation tank 1 by the baffle plate 8, and the scum schema 11 rotates in synchronization with the arm 5.
The scum is scraped up to the rotary scum box 13 position.

When the scum schema 11 rotates to the position of the rotary scum box 13, the roller 12 comes into contact with the lever 15, as shown in FIG. 4, and the rotary scum box 13 rotates around its axis.

As a result, the scum 16 is captured in the rotary scum box 13 as shown in FIG.

At this time, since the rotary scum box 13 is elongated, the scum 16 is completely captured by one scraping operation of the scum schema 11.

When the scum schema 11 passes, the rotary scum box 13 is rotated in the opposite direction by the weight of the lever 15 and returns to its original state as shown in FIG. 5C.

As explained above, according to this embodiment, since the rotary scum box is longer than the conventional one, the scum can be completely captured in one raking motion, and the scum removal efficiency is improved. be able to.

Furthermore, since the rotary scum box rotates by the rotation of the scum schema, no special drive device is required.

In the above embodiments, the rotary scum box has been described as having a cylindrical shape, but the rotary scum box may have a rectangular cylindrical shape, or the scum box may be rotated by an electric device.

The present invention has been described above based on the preferred embodiments, but according to the present invention, it is possible to improve the scum removal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partially machined plan view showing one embodiment of the present invention;
3 is an enlarged view of the principal part of FIG. 1, FIG. 4 is an enlarged sectional view of the principal part of FIG. 2, and FIG. 5a. B and C are schematic diagrams showing the operating states of the rotary scum box, respectively. 1... Sedimentation basin, 2... Sludge pit, 5
...Arm, 11...Scum schema, 13...Rotating scum schema, 16...
...Scum.

Claims (1)

[Scope of utility model registration request] An arm that rotates and scrapes the sludge deposited on the bottom of the settling tank into the sludge pit, a scum schema that scrapes up the scum floating on the water surface, and a rotating scum that captures the scum that has been scraped up. 1. A sludge scraping device comprising: a sludge scraping device, characterized in that the rotary scum box is arranged in a string with respect to a circular settling tank.