JPS6058288A - Flotating sludge scraping apparatus - Google Patents

Abstract

PURPOSE:To provide the titled highly efficient apparatus capable of scraping only a high concn. sludge layer, constituted by providing a horizontal plate, which is continuously opened into water at the front or trailing end part and almost parallel to a water surface, under the rotary loci of plural buckets for scraping floated sludge by rotary driving. CONSTITUTION:In a sludge scraping apparatus wherein a plurality of buckets 14 are attached to a water wheel type rotor supported by a truck (not shown in the drawing) running along a sludge tank 1 and sludge flowed down from each bucket 14 when each bucket 14 having floated conc. sludge scraped therein by rotation comes to the part above a rotation center is discharged by a screw feeder through the sludge charging opening 21 of a hopper, a horizontal plate 32, which is positioned under the rotary locus of the circular arc part 28 of each bucket 14 and continuously opened into water at the front or trailing end part in an advance direction shown by the arrow A and always present under the water level so as to be made almost parallel to the water surface, is attached to the above mentioned truck. By this mechanism, only high concn. sludge 33 is scraped with good efficiency without disturbing the low concn. sludge of a sludge layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to concentrated floating sludge used in flotation concentration tanks, flotation separation tanks, etc. for reducing sludge generated in water treatment processes using activated sludge in sewage treatment plants, etc. It is.

Conventionally, this floating sludge was scraped up to the outside of the tank using a chimney-flight scraper and then discharged outside the tank. However, in this chain flight type scraper, the flight plate disturbs the floating sludge tank or scrapes up low-concentration sludge that floats from the bottom of the sludge layer, so the scraped sludge has a This reduced the shrinkage effect.

In order to solve these drawbacks, a floated sludge scraping device using a trolley and a screw feeder is known (Japanese Patent Publication No. 56-8677, Publication No. 37837 of 1983). , Japanese Patent Publication No. 55-10948
(See Publication No. 4).

The conventional device described in Japanese Patent Publication No. 56-8677 is
The sludge scraped up by the scraper blade is scraped off by rotating a bucket or a drum assembly including horizontal blades, but in order to enable reciprocating scraping, a pair of scraper blades are provided, It had to be raised and lowered alternately, and there were also drawbacks such as the floating sludge being disturbed during scraping.

In addition, in the conventional device described in Japanese Utility Model Publication No. 56-37837, the scraping plate is wrapped in an outer cylinder having an inlet in the scraping direction, and is connected to this inlet to guide the scraping plate approximately parallel to the water surface. Although the plate is attached to the outer cylinder, it is difficult to scrape back and forth in a rectangular tank because the guide plate is connected to the cylindrical outer cylinder even though a guide plate is provided. Since this outer cylinder must return while pushing down the floating sludge during return movement, there are drawbacks such as sinking of the floating sludge.

Furthermore, the conventional device described in Japanese Patent Application Laid-Open No. 55-109484 integrates the conveyor and the case and has scraping blades extending spirally in the direction of rotation of the conveyor case. However, since no guide plate is used, there is a drawback that the floating sludge layer is disturbed during scraping.

The present invention aims to solve these drawbacks and provide a highly efficient floating sludge scraping device that scrapes only the floating high concentration sludge layer. a bucket supporter that is supported by the trolley and driven to rotate; a plurality of buckets that are attached to the bucket supporter and scrape off floating sludge by rotation of the bucket supporter; In a sludge scraping device comprising a sludge transfer device for conveying sludge flowing out from the bucket 7) when it comes to the upper part of the rotation center, the sludge scraping device is located below the rotation locus of the bucket and from the front end to the rear in the direction of movement. A sludge scraping device is provided in which a horizontal plate is attached to the cart so that the end thereof is open in the water and is below the water surface and substantially parallel to the water surface when seated. Therefore, according to the present invention, stirring of the sludge in the tank due to the rotation of the bucket can be prevented, and only the high concentration sludge in the upper part of the sludge tank can be scraped off with the bucket.

Embodiments embodying the present invention will be described below with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a plan view of a sludge scraping device according to an embodiment of the present invention, FIG. 2 is a central front sectional view of the same, FIG. 3 is a side view of the same, and FIG. A schematic side sectional view of the scraping device,
FIG. 5 is a plan view of a scraping device according to an embodiment in which the present invention is applied to a circular tank, and FIG. 6 is a schematic diagram of a scraping device according to an embodiment in which the shape and number of buckets are changed. A side sectional view is shown.

First, the present invention will be explained based on an embodiment not shown in FIGS. 1 to 4.

A rail 3 is provided on the upper surface of the side wall 2 of the sludge tank 1, and a trolley 5 having a plurality of wheels 4 is mounted on the rail 3 so as to be able to run along the sludge tank 1.

Part of this wheel 4 includes a sprocket 6.7 and a chain 8.
It is connected to the trolley drive motor 9 via. Trolley 5
A hollow shaft 11 is fixed to the outer cylinder of the screw feeder 10. This hollow shaft 11 has a plurality of buckets 14 arranged radially around the hollow shaft, and a packet support part that supports the buckets in the horizontal direction and is rotatably attached to the hollow shaft 11 via a bearing 12. A waterwheel-shaped rotating body 15 is attached, which is an example of bucket support plates 13a and 13b. A sprocket 16 is fixed to the bucket support plate 13.
is connected to a water wheel-shaped rotating body drive motor 19 via a chain 18 and a sprocket 17. A hopper 20 is fixed to the upper part of the hollow shaft II according to the length of the bucket 14, and a sludge input opening 21 is provided on the upper surface of the hollow shaft 11, which is the bottom of the hopper 20. A screw feeder 10 is arranged inside this hollow shaft 11, which is connected to a screw feeder drive morph 25 by sprockets 22, 23 and a chain 24. A sludge input chute 2G, which is one outlet of the screw feeder 10, is arranged to protrude into a discharge groove 27 provided parallel to the bogie running rail 3.

FIG. 4 shows an example of a side view of the bucket 14, and in this case, the cross-sectional shape of the bucket 14 corresponds to the rotation trajectory G.
It has a fan shape surrounded by an arcuate portion 28 that coincides with the arcuate portion 28, a side plate 29 connected to the arcuate portion 28 and inclined with respect to the radial direction of the waterwheel-like rotating body 15, and an opening 30 at the front end in the rotational direction. The height of the hollow shaft 11 is adjusted so that the bucket 14 can efficiently scrape off the highly concentrated sludge layer on the water surface when the water wheel-like rotating body 15 rotates.

A horizontal plate 32 having an area approximately equal to the projected area of the water wheel-like rotating body is mounted near the surface of the sludge tank 1 below the rotation locus G of the bucket 14, and is attached to the support arm 3 approximately parallel to the horizontal plane.
1 is fixed to the trolley 5. And this horizontal board 3
The front end to the rear end in the traveling direction of the bucket 2 are continuously opened into the sludge layer, and the sludge flowing from the front end between the horizontal plate 32 and the bucket 28 can flow away as it is toward the rear end. It is constructed so that it will not be dammed up by the bucket 28 or the horizontal plate 32. Next, the operation of the first embodiment will be explained in more detail.

As the cart driving motor 9 rotates, the wheels 4 connected by the sprockets 6 and 7 and the chain 8 are driven, and the cart 5 moves horizontally on the tank 1 along the rail 3 toward the front or the rear.

As a result, as shown in the fourth figure, the horizontal plate 32 moves horizontally under the water surface near the horizontal plane, so that the forward end of the horizontal plate 32 allows the high concentration sludge 33 on the water surface and the low concentration sludge 33 halfway below the water surface to be separated. are separated.

At the same time, the waterwheel-like rotating body 15 is moved by the waterwheel-like rotating body drive motor 19 to the sprockets 17, 16 and the chain 18.
Since the bucket 14 is rotationally driven through the horizontal plate 32, only the highly concentrated sludge separated by the horizontal plate 32 is scraped up by the bucket 14. Highly concentrated sludge that is not subjected to the scraping action is removed from the horizontal plate 32.
It flows backward in the direction of travel through the two-sided part. The surface of the sludge tank is agitated as the water wheel-like rotating body 15 rotates, but since the high-concentration sludge layer 33 and the low-concentration sludge layer 34 are separated by the horizontal plate 32, the high-concentration sludge and low-concentration sludge are separated. No stirring occurs. These effects occur equally when the truck 5 moves forward in the direction shown by arrow A (see FIG. 4) and when it retreats in the opposite direction.

Furthermore, when the cart retreats, the arcuate portion 28 of the bucket acts to push down the high-concentration sludge layer, but since the horizontal plate 32 separates the high-concentration sludge layer 33 and the low-concentration sludge layer 34, The concentrated sludge does not escape to the lower part, and the packet 14 can scrape off only the highly concentrated sludge, and neither layer is stirred.

The highly concentrated sludge scraped off by the bucket 14 flows out due to gravity when the bucket 14 reaches the upper part of the rotation center axis due to the rotation of the waterwheel-like rotating body 15, passes through the hopper 20, and enters the 1° inlet of the screw feeder. The sludge flows into the sludge input opening 21.

The screw feeder 10 is driven by a screw feeder driving motor 23 via sprockets 23, 22, and a chain 24, so that the high concentration sludge flowing in from the sludge input port 21 is concentrated sludge at the exit of the screw feeder 10. It passes through the input chute 26 and is conveyed to the discharge groove 27.

Although the above-mentioned embodiment relates to a rectangular tank, the sludge scraping device of the present invention can of course also be applied to a circular tank.

FIG. 5 shows a plan view of a scraping device according to one embodiment.

In this case, the cart 5' on which the packet support part 13', the bucket 14', the sludge transfer device 10', etc. are mounted is connected to the circular sludge tank 1.
This device scrapes high-concentration sludge while rotating around a vertical shaft 35 installed at the center of the sludge, and has a horizontal plate (not shown) in the water similar to the one shown in the second figure to agitate the upper and lower layers of sludge. prevent.

FIG. 6 shows an example in which the shape and number of brush strokes are changed. Even when the cross section is U-shaped in order to increase the scraping volume by using a large number of buckets 14a (as in this embodiment), high-concentration sludge can be removed by attaching the horizontal plate 32 below the rotation locus of the buckets. This can prevent agitation of low concentration sludge.

In the above embodiment, the screw feeder 10 was used as the sludge transfer mechanism within the hollow shaft 11, but other transfer methods, such as a method using natural fall or a method using a belt conveyor, are also applicable.

In addition, in FIGS. 3 and 4, the center of the screw feeder 10 and the center of the waterwheel-like rotating body 15 are drawn to coincide with each other, but when the device becomes large-sized, the screw feeder 10 and the waterwheel-like rotating body By shifting the center of the water wheel 15 and lifting the screw feeder 10, the radius of the waterwheel-like rotating body 15 can be made smaller.

Furthermore, in the above embodiment, the bearing 12 attached to the hollow shaft 11 is shown as a mode of supporting the water turbine rotating body 15, but in another mode, the inner or outer side of the cylinder extending from the driven side water turbine rotating body is supported by two spaces. There is also a device that is supported and rotated by rollers.

It should be noted that the buckets described above, regardless of their shape, include vanes, blades, etc. capable of scooping up sludge.

As described above, the present invention includes a truck that travels along a sludge layer, a bucket support that is supported by the truck and driven to rotate, and a bucket that is attached to the bucket support and rotates by rotation of the support. Multiple buckets that scrape off floating sludge,
In a sludge scraping device comprising a sludge transfer device that transports sludge flowing out from the bucket when the bucket comes to the center of rotation, the sludge scraping device includes a sludge transfer device that transports sludge flowing out from the bucket when the bucket comes to the center of rotation, and a sludge scraping device that is located below the rotation locus of the bucket and extends from the front end in the direction of movement of the bucket. A sludge scraping device characterized in that a horizontal plate with a mounting number is provided on the cart so that the rear end is continuously opened into the water and is always under the water surface and substantially parallel to the water surface. Therefore, even if the horizontal plate separates the floating high-concentration sludge from the intermediate low-concentration sludge, and the stirring action occurs due to the rotation and horizontal movement of the sludge scraping bucket, the horizontal plate separates the high-concentration sludge from the high-concentration sludge. Since the low-concentration sludge is separated, the bucket can scrape off only the high-concentration sludge.

Furthermore, when the cart moves backward, it is difficult to scrape off only the high concentration sludge due to the pushing down of the high concentration sludge layer by the bucket 1 of the conventional device, but the floating sludge device equipped with the horizontal plate of the present invention By adopting this, high concentration sludge and low concentration sludge do not mix even when the floating sludge scraping device retreats, making it possible to scrape only high concentration sludge even when retreating. Sludge can be collected by going back and forth, making it possible to scrape sludge with high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a sludge scraping device according to an embodiment of the present invention, FIG. 2 is a central front sectional view of the same, FIG. 3 is a side view of the same, and FIG. 4 is a scraping device of the above embodiment. 5 is a plan view of a scraping device according to an embodiment of the present invention applied to a circular tank, and FIG. 6 is an embodiment of the invention in which the shape and number of buckets are changed. A schematic side sectional view of the scraping device according to the figure is not shown. (Explanation of symbols) 1... Sludge tank 5... Cart 10... Screw feeder 13... Bucket support portion 14... Bucket 32... Horizontal plate. Applicant Kobe Steel Co., Ltd. Agent Patent Attorney Takeo Honjo Figure 5 Figure 6

Claims (1)

[Claims] A cart that travels along a sludge tank, a packet support section that is supported by the cart and driven to rotate, a plurality of packets that are attached to the packet support section and scrape off floating sludge by rotation of the packet support section, and the bucket. In the sludge scraping device, the sludge scraping device includes a sludge transfer device that conveys sludge flowing out from the bucket when the packet reaches the upper part of the rotation center, and the device is located below the rotation locus of the packet and from the front end to the rear in the direction of travel. A sludge scraping device characterized in that a horizontal plate is attached to the cart so that an end thereof is continuously opened into the water and is always below the water surface and substantially parallel to the water surface.