JPH10230257A - Suspended matter scraping-up device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten scraping-up efficiency of suspended matter by preventing suspended matter scraped up by a scraping plate from leaking from inside the plate. SOLUTION: In this device for scraping up suspended matter of a sedimentation basin 1 whose planar shape is not a circle, a support arm 22 is provided projectingly on the outer peripheral part of a rotary driving mechanism 21 and a first scraping plate 24 is linked to the support arm 22 through a pair of links 40, 41. The inner end part of a second scraping plate 25 is supported on the inner end side of the support arm 22 and the outer end part thereof is supported on the first scraping plate 24 so as to make it slidable in the length direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating substance scraping apparatus used for scraping floating substances in a sedimentation basin in a sewage treatment facility or a sludge treatment facility. The present invention relates to a floating scraping device applied to a sedimentation basin that is not a perfect circle.

[0002]

2. Description of the Related Art In a sewage treatment plant, for example, after removing solids and the like from sewage, water before treatment containing sludge is sent to a sedimentation basin. At the bottom of the sedimentation basin, the sediment is deposited as sludge. Of the sediment, the sludge containing gas generated by decay or the like floats as scum and floats near the water surface. The suspended matter such as the scum is scraped by a suspended matter raking device and separated from the treated water, and thereafter, the treated water is disinfected and released.

[0003] There are two types of sedimentation basins, one having a perfect circular shape and the other being a non-circular shape. When a plurality of sedimentation basins are provided at one place, wasteful space between the sedimentation basins is required. In order to reduce the size of the sedimentation basin, it is desirable that the planar shape of the settling basin be square.

[0004] Conventionally, there is a device shown in FIG. 11 as a device for scraping suspended matter installed in a rectangular sedimentation pond. In the illustrated floating substance scraping apparatus, a rotary drive mechanism 102 is provided at the center of the sedimentation basin 101 so as to be pivotable. A support arm 103 is provided on the rotary drive mechanism 102 so as to project in the radial direction. The support arm 103 is connected to a raking plate 106 via links 104 and 105 which are parallel to each other and have the same length.
A circulation guide 10 that makes an outer end of the scraping plate 106 along the outer peripheral edge of the settling basin 101 is connected.
7 is slidably supported.

When the support arm 103 is turned in the direction of arrow a by the drive of the rotary drive mechanism 102, the scraping plate 106 is pulled in the same direction to scrape the scum N floating near the water surface. Since the outer end of the scraping plate 106 is restrained by the orbiting guide 107, the scum N floating on the corner 101a of the settling basin 101 is also scraped.

In the sedimentation basin 101, a pipe-shaped suspended solid collecting body 108 is horizontally disposed so as to cross in the radial direction, and the scum N scraped by the scraping plate 106 is disposed.
Are scraped and collected by the suspended matter collecting body 108.

[0007]

However, in the above-mentioned floating material scraping device, the inside of the inner end portion of the scraping plate 106 is open, and especially the scraping plate 106 is in a corner portion of the settling pond 101. When located at 101a, the opening width becomes significantly large.

Therefore, even if the scum N is scraped by the scraping plate 106, a part of the scum N escapes from the open portion to the rear of the scraping plate 106 as shown by the arrow A.
In particular, when the residue is drifted to the center side of the sedimentation basin 101, it is difficult to collect the residue.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a floating object scraping apparatus which can prevent floating substances from escaping from a scraping plate and greatly increase the efficiency of scraping floating substances. The purpose is to provide.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a floating scraping apparatus for scraping floating matters in a sedimentation basin whose planar shape is not a perfect circle. A mechanism, a support arm that rotates integrally with the rotary drive mechanism, a revolving guide provided around the outer periphery of the sedimentation basin, and an outer end slidably supported by the revolving guide. A first scraping plate which is pulled by the support arm via a link mechanism and turns around a water surface around a rotary drive mechanism, and an inner end portion of which is supported by the inner end side of the support arm or the rotary drive mechanism. And a second raking plate that pivots around the water surface inside the first raking plate while the outer end is slidably supported in the length direction by the first raking plate. Things.

In the invention according to claim 2, the link mechanism is
It is composed of a pair of links whose center side is short and whose outer side is long.

[0012]

When the rotary drive mechanism is driven, the support arm rotates integrally and pulls the first scraping plate via the link mechanism. Thus, the first raking plate pivots around the water surface around the rotary drive mechanism in the same direction as the support arm while being guided by the circulation guide along the outer peripheral edge of the settling basin,
Of the first scraping plate also pivots in the same direction while sliding in the longitudinal direction of the first scraping plate. Each of the first and second raking plates rakes a floating substance floating near the water surface while turning. Since the inside of the inner end portion of the first scraping plate is closed by the second scraping plate, the scraped-in floating substances may escape behind each of the scraping plates. Absent.

According to the second aspect of the present invention, in the link mechanism, since the pair of links are set short on the center side and long on the outer side, the first scraping plate is always settled. It turns along the pond's radial direction.

[0014]

1 and 2 show an example in which the apparatus for scraping suspended matter according to the present invention is installed in a sedimentation basin in a final treatment step in a sewage treatment plant. The apparatus for scraping suspended matter of the present invention is not limited to the sedimentation basin of the sewage treatment facility, but can be applied to other sedimentation basins such as a sludge treatment facility.

The settling basin 1 in the illustrated example has a rectangular planar shape, and each corner 1a is formed in an arc shape. The bottom 1b of the settling basin 1 is constituted by an inclined surface descending toward the center, and a tubular portion 2 is provided upright at the center of the bottom 1b. This tubular portion 2, pretreatment after such solids have been removed sewage (hereinafter referred to as "raw") inlet tube 3 of W ₀ is provided. An inflow pipe 3 is provided at the upper end of the cylindrical portion 2.
Izutsu 4 for the raw water W ₀ fed from the outlet 3a is dispersed and fed to the sedimentation tank 1 is disposed.

An annular groove 5 for accumulating sludge is formed on the outer periphery of the cylindrical portion 2 at the bottom 1b of the sedimentation pond 1, and a drawing pipe 6 for extracting the sludge M to the outside is formed in this groove 5. Are in communication.

An annular recess 7 surrounding the sedimentation basin 1 is formed in the upper part of the outer peripheral wall of the sedimentation basin 1. The scum N from the raw water W ₀ is removed in the annular recess 7. The treated water W flows in. As shown in FIG. 3, the sedimentation basin 1 is provided on the peripheral wall 7a on the opening side of the annular recess 7.
Is provided. The treated water W that has flowed into the annular recess 7 is drawn out to the outside by the drawing pipe 9.

[0018] Around the Inside the dam member 8, scum N floating near the water surface W _L of sedimentation 1 scum flows preventing plate 10 for preventing the flow into the annular recess 7, a sedimentation basin 1 So that it is fixed by the mounting member 11. In FIG. 2, reference numeral 12 denotes a bridge erected above the sedimentation basin 1, which crosses through the center of the sedimentation basin 1.

At the center of the settling basin 1, a rotary drive mechanism 21 is provided. The rotary drive mechanism 21 includes a rotary tubular portion 27 rotatably fitted to the tubular portion 2 and an output wheel body 28 concentrically connected to an upper end of the rotary tubular portion 27.
A motor 29 installed on the bridge 12; and a speed reduction mechanism 30 provided between the motor 29 and the output wheel body 28. The rotational force of the motor 29
0 to the output wheel body 28, the rotating cylinder 27 rotates at low speed and high torque in the direction of arrow a in FIG.

A pair of sliding arms 31, 31 each formed of a truss-shaped structure are provided on the outer peripheral surface of the lower portion of the rotary cylindrical portion 27 in a radial direction. Each sliding arm 31 has a pond bottom 1b
A sludge scraping blade 32 for sliding the sludge M deposited on the bottom 1b into the annular groove 5;
A blade 33 is provided for turning around the inside and collecting sludge M. The sludge M collected in the annular groove 5 is drawn out by a drawing pipe 6.

The suspended matter scraping device installed in the sedimentation basin 1 includes the above-described rotary drive mechanism 21 and the rotary drive mechanism 2.
1, a support arm 22 protruding radially on an outer peripheral portion, a circulating guide 23 provided around the outer peripheral edge 1 c of the sedimentation basin 1, and the rotation drive by being pulled by the support arm 22. the pivots around the vicinity of the water surface W _L mechanisms 21 1
And the inner end side of the support arm 22 and the first
The first scraping plate 24 is disposed between the first scraping plate 24
Second raking that the pivoting around the water surface W _L of the inner position causes the plate 2
5 and a suspended matter collection unit 26 for collecting the scraped suspended matter N.

The support arm 22 is formed of a truss-shaped structure, the inner end of which is fixedly connected to the outer peripheral surface of the rotary cylinder portion 27, and integrally with the rotation of the rotary drive mechanism 21 in the direction of arrow a in FIG. Turn. The illustrated support arm 22 is
For cantilever support, the weight is reduced by being formed in a tapered shape toward the outer end, but the configuration of the support arm 22 is not limited to the truss-shaped structure.

As shown in FIG. 3, the orbiting guide 23 is provided at the upper end of the scum inflow prevention plate 10, and in this embodiment, the cross-sectional shape is made of an L-shaped metal plate. The circling guide 23 can be provided separately and independently from the scum inflow prevention plate 10.

As shown in FIGS. 4 and 7, the first scraping plate 24 is composed of a base 34 composed of a truss-shaped structure and a rubber suspended on a lower surface of the base 34 via a suspension member 35. And the entire length of the plate-shaped piece 36 substantially corresponds to the entire length of the base 34.

At the outer end 24a of the first scraping plate 24,
As shown in FIG. 3, a roller support plate 37 is provided which protrudes above the orbiting guide 23. The lower surface of the roller support plate 37 is provided with a traveling roller 38 that rolls on the orbiting guide 23 and a pair of guide rollers 39 and 39 arranged on both sides of the orbiting guide 23. The outer end 24a of the scraper plate 24 is slidably supported by the orbiting guide 23 via the running roller 38 and the guide rollers 39 and 39.

The support arm 22 and the first scraping plate 24
Are linked by a link mechanism including a pair of links 40 and 41 on the center side and the outer side. As shown in FIG. 5, the link 40 on the center side is made of, for example, a truss-shaped structure, and one end portion 40a is connected via a pin holder 42 and a pivot pin 43 held by the pin holder 42.
The support arm 22 is rotatably supported on a horizontal plane. The other end 40b of the link 40 is pivotally connected to the first scraping plate 24 via a similar pin holder 44 and a pivot pin 45 held by the pin holder 44 in a horizontal plane. Supported.

As shown in FIG. 6, the outer link 41 is formed of, for example, a truss-shaped structure.
a via a pin holder 46 and a pivot pin 47 held by the pin holder 46, and the other end 41b via a pin holder 48 and a pivot pin 49 held by the pin holder 48, respectively. The support arm 22 and the first scraping plate 24 are pivotally supported on a horizontal plane so as to be freely rotatable.
By the pair of links 40 and 41, the first scraping plate 2
4 is the sedimentation basin 1 when pulled by the support arm 22.
Is allowed to follow the plane shape of.

The outer link 41 is the center link 4
The length is set to be larger than 0, whereby the first raking plate 24 is swung along the radial direction of the sedimentation basin 1.

As shown in FIG. 4, the second scraping plate 25 is formed by, for example, a base 50 made of an extruded material and having a U-shaped vertical cross-section, and a suspending member 51 attached to the lower surface of the base 50 via a suspending member 51. And a plate-like piece 52 made of rubber.

As shown in FIGS. 7 and 8, the inner end 25a of the second scraper plate 25 is connected to a pin 54 by a shaft support member 53 fixed to the side surface of the inner end 22a of the support arm 22. And is rotatably supported in the horizontal plane via the. Between the outer end 25b of the second raking plate 25 and the base 34 of the first raking plate 24, the outer end 25b of the second raking plate 25
With respect to the first scraping plate 24 in the length direction (arrow X in FIG. 7).
(Direction) is formed.

As shown in FIG. 8, the sliding portion 55 has a gate-shaped member 56 fixed to the front surface of the first scraper plate 24 along the longitudinal direction and having a gate-shaped cross section. A pair of guide rails 56b, 56b formed by bending the lower edges of both side walls 56a, 56a of the member 56 inward and horizontally.
A movable member 57 disposed in the gate member 56 so as to be movable in the longitudinal direction; and a pair of guide rollers supported on both sides of the movable member 57 and movable on the guide rail portions 56b, 56b. 58, and a suspension bolt 59 whose upper end is rotatably supported by the movable body 57 and whose lower end is fixed to the base 50 of the second scraper plate 25.

The sliding portion 55 allows the second scraping plate 2
5, the outer end portion 25b is slidable in the length direction with respect to the first scraping plate 24 and is rotatable in a horizontal plane. For this reason, the outer end 25b of the second raking plate 25
When the first raking plate 24 is displaced in the length direction following the plane shape of the sedimentation basin 1 while rotating, it slides in the length direction while changing the cross angle with respect to the first raking plate 24. . Note that the inner end portion 25a of the second scraping plate 25 may be supported by a rotary cylinder 27 of the rotary drive mechanism 21.

The above-mentioned suspended matter recovery section 26 is shown in FIGS.
(3) As shown in, the suspended matter collecting body 60 of the horizontally disposed pipes shape so as to substantially cross the sedimentation tank 1 in the radial direction in the vicinity of the water surface W _L of sedimentation tank 1, the suspended matter collecting body 60,
A cylinder 61 that tilts by rotating the shaft in accordance with the turning position of the first and second scraper plates 24 and 25, and extends in the longitudinal direction on a part of the peripheral wall of the suspended matter collection body 60. A float receiving port 62 is formed. The suspended matter recovery body 60 is supported by the sedimentation basin 1 via a supporting girder 63.

The floating material receiving port 62 has first and second
When the scraper plates 24, 25 of FIG.
When the first and second scraping plates 24 and 25 are set to the upward standby position shown in FIG.
It is set to the receiving position along the surface of the water W _L as shown in (2). In this state, when the first and second scraping plates 24 and 25 pass through the suspended solid collection body 60, the scum N is scraped into the suspended solid collection body 60 from the floating substance receiving port 62.

The floating material receiving port 62 includes first and second
After the scraper plates 24, 25 of FIG.
In this case, the scum N scraped into the suspended solid collecting body 60 is pulled out to the outside by the extraction tube 64 connected to the suspended solid collecting body 60.

The floating object recovery body 60 may be configured such that the floating object receiving port 62 is opened and closed by a shutter member in synchronization with the passage of the first and second scraper plates 24 and 25. Good. Further, the suspended solid collection body 60 can be installed at a plurality of locations around the center of the settling basin 1.

Next, the operation of the above embodiment will be described. Raw water W ₀ passes through the inflow pipe 3, passes through the well 4, and settles in
Supplied within. Sludge M in the raw water W ₀ settles down and the bottom of the pond 1
b. Of the deposited sludge M, rot to those containing the gas floats, floats near the water surface W _L as scum N.

When the motor 29 of the rotary drive mechanism 21 operates, the rotational force is reduced and transmitted to the rotary cylinder 27. The rotation of the rotary cylinder 27 causes the support arm 2 to rotate.
2 and a sliding arm 31 around the center of the sedimentation basin 1
Turn in the direction.

By the rotation of the sliding arm 31, the sludge scraping blade 32 collects the sludge M deposited on the pond bottom 1b, and the sludge M moves from the pond bottom 1b to the annular groove 5 and is pulled out by the drawing pipe 6. To be pulled out.

On the other hand, when the support arm 22 turns in the direction of arrow a, the first scraping plate 24 connected to the support arm 22 via the links 40 and 41 and the support arm 2
And 2 and the second raking was a plate 25 which is cooperative with the first raking allowed the plate 24 to pivot in the same direction, the plate-like pieces 36, 52 of each raking allowed plates 24 and 25, in the vicinity of the water surface W _L The floating scum N is swept up.

The first scraping plate 24 has an outer end 24a.
Since There has been constrained to the circumferential guide 23, following the plan shape of the sedimentation tank 1 during turning, displaced as shown in FIG. 10, scum floating near the water surface W _L of the corner portion 1a N
Can be raked without remaining.

[0042] Since the second raking allowed plate 25 pivots inside the water surface W near _L of the first raking allowed the plate 24, that scum N is escaping backward from the inside of the first raking allowed plate 24 Will be blocked.

[0043] When the first and second raking allowed plates 24, 25 approaches the suspended matter collecting body 60 while scraped scum N, suspended solids receiving slot 62 to tilt the floating product recovered body 60 near the water surface W _L Turn to. First and second scraping plates 24,
The scum N is scraped into the suspended matter collection body 60 from the suspended matter receiving port 62 when the 25 passes through the suspended matter collection body 60. The treated water W from which the scum N has been removed flows into the annular recess 7, is drawn out from the drawing pipe 9 to the outside, and is subjected to post-treatment such as disinfection.

The center side link 40 is the outer side link 4
1, the first raking plate 24 always rotates along the radial direction of the sedimentation basin 1, so that the scum N can be raked without moving in the radial direction. When passing through the collecting body 60, the scum N is parallel to the suspended matter collecting body 60, and the scraping of the scum N is efficiently performed over a wide range over the entire length of the suspended matter collecting body 60 in the longitudinal direction.

[0045]

As described above, according to the present invention, in addition to the first scraping plate which is pulled by the support arm via the link mechanism and turns, the outer end portion is longitudinally attached to the first scraping plate. Since the second rake plate supported so as to be freely slidable is provided, the floating matter raked by the first rake plate is prevented from escaping backward from the inside of the rake plate. The scraping efficiency is greatly improved.

According to the second aspect of the present invention, since the support arm and the first scraping plate are connected by a pair of links having a short center side and a long outer circumferential side, the first scraping plate is always in the radial direction. The scum is swung in a state in which the scum is scraped and collected efficiently.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example in which a floating substance scraping device of the present invention is installed in a sedimentation pond of a sewage treatment facility.

FIG. 2 is a longitudinal sectional view of a sedimentation pond provided with a suspended matter scraping device.

FIG. 3 is an enlarged longitudinal sectional view showing an outer peripheral portion of a settling pond.

FIG. 4 is a side view showing first and second scraping plates.

FIG. 5 is a front view showing a center side link.

FIG. 6 is a front view showing an outer peripheral side link;

FIG. 7 is a front view showing a state where the second scraping plate is supported by the support arm and the first scraping plate.

FIG. 8 is a perspective view showing a part of a support structure of a second scraping plate, partially broken away.

FIG. 9 is an explanatory diagram showing an operation of a suspended matter collection unit.

FIG. 10 is a plan view showing the operation of the first and second scraping plates.

FIG. 11 is a plan view showing a conventional suspended matter scraping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sedimentation basin 21 Rotation drive mechanism 22 Support arm 23 Circulation guide 24 1st raking plate 25 2nd raking plate 41 Center side link 42 Outer side link

Claims (2)

[Claims] 1. A floating substance raking device for raking a floating substance from a sedimentation basin whose planar shape is not a perfect circle, comprising: a rotatable rotary drive mechanism provided at a center position of the sedimentation basin; A support arm that rotates integrally, a circulating guide provided around the periphery of the settling basin, and a link mechanism via the link mechanism with the outer end slidably supported by the circulating guide. A first scraping plate that is towed and pivots around the water surface around the rotary drive mechanism, an inner end of which is supported by the inner end side of the support arm or the rotary drive mechanism and an outer end of which is the first A floating scraping device, comprising: a second scraping plate that pivots around a water surface at a position inside the first scraping plate while being supported by the scraping plate so as to be freely slidable in the length direction. 2. The floating object scraping device according to claim 1, wherein the link mechanism comprises a pair of links having a short center side and a long outer periphery side.