JP3296633B2 - Sludge scraper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge scraper which ensures that settled sludge is swept without being rolled up or unscraped.

[0002]

2. Description of the Related Art In a sewage treatment plant, inflowing sewage is guided to a sedimentation basin, and after solid matter in the sewage, ie, sludge, is settled and removed, the sewage is supplied to an aeration tank to perform aeration treatment. After solid-liquid separation of the inflowing sewage in this way, it is common practice to separately treat the solid content and the sewage. The sludge deposited in the sedimentation basin is collected in a sludge pit provided at a part of the bottom of the sedimentation basin by a sludge scraping plate, and then guided to the outside of the pond for treatment. As a conventional sludge scraper, a flight is carried over two endless chains running along the length of the pond on both sides of the pond, and the sludge settled by the operation of the flight along the pond is removed. There is a chain flight type that rakes up.

[0003]

In this chain flight type sludge scraper, a guide rail is laid along the bottom of a pond, a sprocket is provided in water, and a flight is provided on an endless chain stretched on the sprocket wheel. The guide rail is slid on the guide rail, so that the guide rail, flight shoe, etc., are severely worn. Since the guide rails, sprocket wheels, endless chains, and the like are installed at the bottom of the pond for maintenance, there is a drawback that the work is large and the number of parts used is large, and the management cost is large.

[0004] The present invention replaces the chain flight type, which has a large number of parts, with no sludge remaining.
The purpose is to make sure that they are easily scraped and that maintenance and management are easy.

[0005]

Means for Solving the Problems The present invention has been made to achieve the above object, and a swing frame in which a large number of sludge scraping plates for scraping sludge settled on the bottom of a pond are provided in the bottom of the pond. The swing frame is suspended and supported by the swing lever so as to be able to swing while maintaining the horizontal position, and a rotating link is engaged with the upper end of the swing lever to convert the circular motion into a linear motion. In addition, the gist is that a supporting shaft is provided to penetrate and support a long hole formed in the upper part of the swing lever so that the swing lever can be moved in the longitudinal direction and swingably supported. I do.

[0006]

The rotary link is supported at the upper end of the swing lever so as to change the rotational motion into a linear motion, and furthermore, the swing lever is vertically movable and swingable and supported. Since a swinging frame with a sludge scraping plate is provided, the sludge scraping plate suspended on the swinging frame is located along the bottom of the pond and in contact with the bottom of the pond in the sludge scraping direction. When returning, the sludge rises above the bottom of the pond and performs peristaltic motion, so that the sludge settled on the bottom of the pond can be reliably scraped without being left behind.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The sludge scraper of the present invention will be described below with reference to the illustrated embodiment. In the figure, reference numeral 1 denotes a sedimentation basin that guides sewage and separates solid and liquid of solid sludge and filth water. The bottom of the sedimentation basin is slightly dug at one end in the longitudinal direction of the sedimentation basin 1 to form a hopper. The sludge hopper 2 thus formed is integrally formed, and the sludge settled at the bottom of the pond is scraped and discharged out of the pond.

In the sedimentation basin 1, an oscillating sludge scraper 3 according to the present invention is provided. As shown in detail in FIGS. 1 to 3, the sludge scraper 3 has a swinging frame 4 slightly smaller than the flat area of the bottom of the settling basin 1 where sludge is settled, and a lower end of the swinging frame. And a number of sludge scraping plates 5 having a length substantially equal to or slightly shorter than the width of the bottom of the pond, and a swinging frame provided with the sludge scraping plate. 4 comprises a swing lever 6 which swings freely and vertically supports it.

The frame-shaped swing frame 4 has a large number of sludge scraping plates 5, 5...
1 and 3 are provided so as to be swingable in the swinging direction of the swinging frame as shown in FIGS. 1 and 3 or are fixedly installed vertically, and the swinging frame 4 is provided in the pond length direction, Moreover, when moving in the direction toward the sludge hopper 2, the entire sludge scraper 5
The bottom end of the tank is in contact with the bottom of the pond, and the sludge settled on the bottom of the pond is swept by the tact feed with the swing distance of the swing frame being one pitch.

The vertical swinging and swinging of the swing frame 4 in the bottom of the pond is performed by a swing lever. In this case, the swing frame 4 is provided with swing levers 6, 6,... At least at four positions on both front and rear sides of the swing frame so as to be supported substantially horizontally with respect to the bottom of the pond. The lower end of 6 is pivotally supported on the side surface of the swing frame 4 via a shaft, and the lever support shaft 7 is penetrated and supported in an elongated hole 6H formed in the upper part of each swing lever 6.

The lever support shaft 7 is provided at least above the allowable maximum water level of the sedimentation basin 1 and is provided so as to protrude from the inner surface of the sedimentation basin 1 or to be disposed above the pond as shown in the figure. It protrudes from the frame F. Each of the lever support shafts 7 is located at the same height position and serves as a swing support point of the full swing lever 6. As shown in FIG. 4, the length of the long hole 6H of the swing lever 6 penetrating the lever support shaft 7 is such that when the swing frame and the sludge scraping plate move toward the sludge hopper, The lower end of the plate 5 is at the lower end position L where it slides in the horizontal direction in contact with the bottom of the pond, and is slightly separated from the return side position of the sludge scraping plate, that is, the bottom of the pond. The upper and lower ends H, L such that the lower end of the sludge scraping plate returns to the upper position from the upper surface of the scraping sludge so as not to be transferred to the upper side.
It is determined so as to be an up-and-down stroke between them.

The upper end of each swing lever 6 has a rotary link 8
The swinging levers 6 are all pivotally synchronized by the rotation of the rotary link 8 and swing around the lever support shaft 7 while moving up and down by the stroke of the long hole. It is.

As shown in FIG. 4, when the pivot axis of the swing lever 6 is pivotally connected to the rotating link 8 at the point A, the swing lever 6 is located at the point A at the lower end position L. The swing lever is at the lower end position and moves horizontally, that is, along the bottom of the pond, until the pivot reaches the point B from the point A by the rotation of. Until the pivot axis reaches from point A to point B, the scraping plate 5 also moves horizontally from point A to point B, and uses this as one pitch to scrape sludge. When the pivot axis moves from point B to point C, the swing lever moves up. When the pivot axis reaches point C, the swing lever reaches the maximum swing position.
When the link rotates through F, the swing lever swings in a raised state. For this reason, the rotation axis of the rotary link 8 causes the pivot shaft to perform a circular motion, but the lower end of the swing lever is flattened in the lower horizontal direction on the outward path and almost horizontal direction on the upper path in the return path as shown in FIG. Move so as to draw a loop-like trajectory. As a result, the swinging frame 4 performs a peristaltic motion so that the settled sludge is raked toward the sludge hopper side by one pitch.

The rotary link 8 is provided at the tip of a shaft 10 driven by a drive unit 9 and a shaft 12 driven by differential units 11 and 11, respectively.
Are rotated synchronously.

Since the swinging frame 4 is held at the lower end position L and the lower end of the sludge scraping plate slides on the bottom of the pond with a set pressing force, the lower end regulating guides 13, 13 are provided.
Projecting from the bottom wall of the pond so as to support the lower surface of the swing frame. At this time, a guide roller is provided on the lower end regulating guide so that the swing frame moves smoothly, and the swing frame 4 is supported by the guide roller 14.

In the figure, reference numeral 15 denotes a scum skimmer provided at the position of the water surface of the pond. The scum floating on the water surface is moved above the oscillating frame by a scum floating flight 16 projecting from the frame. When moving on the return path side, it is raked to the scum skimmer side and discharged from the scum skimmer.

When the rocking frame is moved on the return path side, the scraping plate 5 is tilted so as to be tilted horizontally, so that when the scraping plate returns, it is possible to prevent the settling sludge from being rolled up. If the swing frame is made hollow, the buoyancy can be used to reduce the driving force.

[0018]

The sludge scraper according to the present invention is provided with a swinging frame having a large number of sludge scraping plates for scraping the sludge settled on the bottom of the pond arranged in the bottom of the pond. In order to maintain a horizontal position and swingably support the swinging lever, a rotating link is attached to the upper end of this swinging lever to change the circular motion into a linear motion, and furthermore, a hole is drilled above the swinging lever. The swinging lever is movable in the longitudinal direction and is swingably supported, and the swinging center of the swinging lever is located below the center of rotation by the rotating link. Since the lever is provided, the lower end of the lever swings so as to be fast in the sludge scraping direction and slow in the return direction, so that the sludge can be prevented from being agitated when the scraping plate returns. Further, since the lower end of the scraping plate moves horizontally by one pitch by peristaltic motion along the bottom of the pond, the sludge settled on the bottom of the pond can be reliably scraped and discharged without being left behind.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional 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 explanatory diagram of an operation of a swing lever.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Settlement pond 2 Sludge hopper 3 Sludge scraper 4 Rocking frame 5 Sludge scraper 6 Rocking lever

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-57-194011 (JP, A) JP-A-60-144906 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 21/18

Claims (1)

(57) [Claims] An oscillating frame having a large number of sludge scraping plates for scraping the sludge settled on the bottom of the pond is disposed in the bottom of the pond, and the oscillating frame is kept horizontal by an oscillating lever. In addition to swingably supporting the swinging lever, a rotating link is engaged with the upper end of the swinging lever to change the circular motion into a linear motion, and further penetrates into an elongated hole formed in the upper part of the swinging lever. A sludge scraper which is provided with a supporting shaft for supporting the slewing and which is capable of swaying by making a swinging lever movable in a longitudinal direction.