JPH08267059A - Sludge scraper - Google Patents

Abstract

PURPOSE: To surely scrap scum without stagnation on a water surface even in a water surface part along the inner side faces of a basin with flights on a return side and preventing the backflow of this scum to an inflow side. CONSTITUTION: A scum guide 10 is disposed in the positions near the water surface between the end faces of a return side flights 4 to scrap the scum toward a scum skimmer 7 and the inner side walls of the basin. The scum guide 10 has a necessary length from the inflow side of the basin near to the scum skimmer 7 and the inner bottom surface thereof is formed as a slope. As a result, the scum generated in the basin is completely scraped to the scum skimmer 7 and is discharged outside the basin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a chain flight type sludge scraper used in a settling basin for treating sewage and wastewater, and an object of the present invention is to reliably scrape and discharge scum in the pond without retaining it. To do.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional chain flight sludge attractor installed in a settling basin. Figure 7. FIG. There are the following. In this type of sludge attracting machine, scum floating on the surface of the water on the return flight is scraped to the scum skimmer, and the scum is swallowed with the surface water and discharged to the outside of the pond.

[0003]

However, in the conventional sludge scraper, since there is a large gap L between the inner wall surface of the sedimentation basin and the flight end surface, this portion may scrape the scum on the return flight. It was not possible, and a lot of scum stayed on the water surface along the inside of the pond, which caused problems such as deterioration of treated water quality, bad odor due to decay, generation of pests, and deterioration of appearance. Further, a phenomenon occurs in which the scum that has been scraped in the corner returns to the inflow side from this gap L portion, which promotes the above problem.

It is an object of the present invention to reliably scrape scum and prevent it from flowing back to the inflow side even on the water surface along the inner surface of the pond during the flight on the return side without staying on the water surface.

[0005]

The present invention has been made in order to achieve the above object, and eliminates a large gap L between the flight end surface on the return side and the inner wall surface of the pond, and removes all scum on the water surface from the return side. A scum guide is provided between the flight end surface on the return side and the inner wall surface of the pond so that it can be scraped by flight.This scum guide is located near the water surface on both sides of the inner wall of the pond and from the vicinity of the drive shaft on the inflow side to the downstream side. It is provided with the required length up to the vicinity of the scum clearance, and the scum guide has a shape with the bottom surface on the pond bottom side inclined, and the guide rail for the return flight is attached directly to this scum guide via a bracket. And

[0006]

By providing the scum guide along the operation trajectory of the return flight on the inner wall surface of the pond, the gap L between the return flight end surface and the inner wall surface of the pond is eliminated, and the scum stays over the entire length of the scum guide. In addition to being able to prevent it, scum generated near the pond wall rises along the inclined surface of the bottom surface of the scum guide and is guided to the scraping range of the return flight, so that all scum generated in the pond is scraped to the scum gap. It will be discharged to the outside of the pond. Further, due to these actions, there is no accumulation of scum in the sedimentation basin, and problems with the conventional machine such as deterioration of treated water quality due to scum, bad odor due to decay, generation of harmful insects, and deterioration of appearance are solved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sludge scraper according to the present invention will be described below with reference to the illustrated embodiments. 1 is a vertical sectional front view showing the entire first embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a vertical sectional side view thereof. The chain flight type sludge scraper of the present invention is installed in a settling basin 1, and as shown in the drawing, it comprises two scraping chains 2 and 2 stretched along the inner side surface in the longitudinal direction of the basin. Sprocket wheels 31, 32 for each axis in Ikeuchi,
It is constructed by endlessly stretching between 33 and 34, and mounting a large number of flights 4, 4 ... At regular intervals.

And this one sprocket wheel 3
1 is driven by the drive device 5 to drive the sludge attractor at a predetermined speed. Further, a guide rail 6 is arranged in the longitudinal direction on the pond bottom, and the flight 4 on the outward path moves so as to slide with respect to the guide rail 6, and the dirty sand settled on the pond bottom is moved to the pond bottom end side. So that it can be scraped into the hopper H provided at.

In the sedimentation basin 1, a scum skimmer 7 and an overflow trough 8 are provided on the water surface at the terminal position of the return flight, and the scum collected by the return flight is discharged to the scum pit S outside the pond by the scum skimmer 7. The supernatant treated water is drained from the overflow trough 8 to the outside of the pond.

A guide rail slidably supporting the underside of the flight so that the flight on the return (return) side runs on the hopper side from the upstream side of the sedimentation basin 1 to the downstream side of the basin at the water surface position. 9 is arranged at least along the operating length of the return (return) flight.

Further, the scum skimmer 7 provided in front of the overflow trough 8 on the outflow side of the sedimentation basin is a scraper interlocking type pipe skimmer in this embodiment, but it is not limited to this. A scum pit S and a scum transfer pump P are provided on the side of the pond. In the present invention, the scum guides 10 are provided at positions near the water surface on both sides of the pond wall, from near the inflow side drive shaft to near the scum skimmer. A guide rail 9 of the return flight 4 and its mounting bracket 9B are attached to the scum guide 10. The scum guide 10 is attached to the inner wall of the pond so that the gap between the inner surface and the end surface of the return flight 4 is as small as possible without hindering the operation of the return flight.

FIG. 4 shows a cross section of the scum guide 10. The lower surface 10a of the scum guide 10 is an inclined surface forming an angle θ with the pond wall. As a result, scum generated near both pond walls rises along the slope of the bottom surface of the scum guide and is guided to the scraping range of the return flight.

Therefore, in the movement of the sludge scraper constructed as described above, the drive shaft and the sprocket wheel for driving are rotated from the drive device 5 through the transmission chain C, and the scraping chain 2 is moved.
And the flight 4 attached to this chain 2 is circulated in the pond. On the scraping side, the flight 4 attached to the scraping chain scrapes sludge that has settled on the bottom of the pond to the hopper H on the inflow side, and is turned over to the water surface. Scrape the surfaced scum to the scum gap 7. At this time, all of the generated scum is guided to the scraping range of the return flight by the scum guides 10 provided on both side walls, and the scum clearance 7 is surely achieved.
Sent to the lake, which eliminates the accumulation of scum in the pond.

The scum raked in is swallowed together with surface water by a scum skimmer 7 that operates periodically, flows into a scum pit S, and is sent by a scum transfer pump P to a separate facility provided separately for treatment.

FIG. 5 is a sectional view of a scum guide showing a second embodiment of the present invention, in which a step portion 10b is formed on the inner side surface of the scum guide body 10, and a flat steel guide is provided on the step portion 10b. The rail 9b is attached by bolts or spot welding so that it can be replaced, and the scum guide body and the guide rail are integrally attached. As a result, it is not necessary to separately provide the guide rail 9 and the mounting bracket 9B, the structure is simplified, and the manufacturing cost and the on-site installation cost can be reduced.

[0016]

According to the sludge scraper of the present invention, the scum guide disposed along the inner wall surface of the sedimentation basin eliminates the accumulation of scum in the basin, resulting in deterioration of treated water quality, bad odor due to decay, and harmful insects. There is an advantage that problems such as the occurrence of a defect and the deterioration of the appearance are eliminated. Since the guide rail for the return flight is attached to the scum guide via the mounting bracket, the installation work can be done easily. In addition, since the guide rail for the return flight is integrally provided on the stepped portion provided on the inner surface of the scum guide, it is not necessary to separately provide a mounting bracket, and the structure is simple, and the manufacturing cost and installation cost can be reduced. There is.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a sludge scraper of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a vertical sectional side view of the same.

FIG. 4 is an enlarged explanatory view of a scum guide portion.

FIG. 5 is an explanatory diagram of another embodiment of the scum guide.

FIG. 6 is an explanatory view of a known sludge scraper.

FIG. 7 is a plan view of the same.

FIG. 8 is a side view of the same.

[Explanation of symbols]

 1 Sedimentation basin 2 Scraping chain 4 Flight 9 Guide rail 9B Mounting bracket 10 Scum guide

Claims (3)

[Claims] 1. A scum guide is disposed near the water surface between the end face of the return flight for scraping the scum to the scum skimmer and the inner wall of the pond, and this scum guide has a required length from the inflow side of the pond to the vicinity of the scum skimmer. A sludge scraper having a height and an inner lower surface thereof being an inclined surface. 2. The sludge scraper according to claim 1, wherein a bracket is provided on the scum guide provided on the inner side surface of the sedimentation pond, and a guide rail for the return flight is attached by this bracket. 3. The sludge scraper according to claim 1, wherein a guide rail for the return flight is integrally formed with a step formed on the inner surface of the scum guide.