JP2000084306A - Sludge scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge scraper capable of eliminating driving parts such as a rotating part and an engaging part by providing a simple mechanism above water surface, capable of smoothly and surely scraping up the sludge depositing on the bottom of a settling tank and capable of being easily maintained and excellent in durability. SOLUTION: This scraper is composed of two upper and lower rails 31 and 32 laid above a settling tank 1, a moving body 21 along the rails, a driving means 25 for reciprocating the body 21, a switching mechanism 6 for moving the body 21 on the forcedly selected rail 31 or 32 according to the moving direction of the body 21, a lower frame 22 provided with a scraper plate 22F provided to the body 21 and scraping up the sludge depositing on the bottom 11 of the tank when the body 21 moves along the rail 31 and an upper frame 23 furnished with a scraper plate 23F scraping up the scum floating on the water surface when the body 21 is moved along the rail 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge scraper, and more particularly, to a method in which a simple mechanism is provided at a position above the water surface to eliminate a driving unit such as a rotating unit and a meshing unit which are disposed in water and to settle the sludge. The present invention relates to a sludge scraper capable of scraping sludge, sediment, and the like (hereinafter referred to as “sludge”) deposited on the bottom of a pond.

[0002]

2. Description of the Related Art Sewage flowing into a sewage treatment plant and river water flowing into a water purification plant (hereinafter referred to as "inflow water") contain a large amount of mud and soil, particularly during rainfall. I have. For this reason, in a sewage treatment plant and a water purification plant, inflow water is once introduced into a sedimentation basin, where mud and earth and sand contained in the inflow water are settled and separated.

[0003] The sludge deposited on the bottom of the settling pond is
Sludge is collected in a sludge pit provided on one side of the bottom of the sedimentation basin by a sludge scraper installed in the sedimentation basin, and then discharged out of the sedimentation basin for treatment.

Conventionally, in a sedimentation basin, a scraping plate F is provided at a predetermined interval on an endless chain C which is stretched oppositely so as to be driven along the pond bottom 11 of the sedimentation basin 1. And set it up so that
Is driven by a motor M to circulate the sludge deposited on the bottom of the pond by a scraping plate F attached to a chain C (see FIG. 6). A self-propelled traveling carriage along the sedimentation pond is provided with an arm equipped with a scraping plate at the tip, and by traveling the traveling cart, the scraping plate attached to the traveling cart via the arm allows the bottom of the pond to be moved. Sludge scrapers, such as self-propelled sludge scrapers, which scrape sludge deposited on the ground, are widely used.

[0005]

However, in the chain type sludge scraper, when the sludge scraper is stopped, during rainfall, etc., the inflow water containing a large amount of mud or soil is temporarily settled. When the water flows into the pond 1, the driving portion such as the rotating portion and the meshing portion including the sprocket wheel SP and the chain C is buried in the sludge deposited on the pond bottom 11 of the sedimentation basin 1 and cannot be operated again. In addition, the driving parts such as the rotating part and the meshing part composed of the sprocket wheel SP and the chain C disposed in the water are liable to be broken down due to wear and the like, which requires time and effort for maintenance and durability of the equipment. But there was a problem. On the other hand, the self-propelled sludge scraper has a problem that the machinery and equipment become large and the equipment cost and the operating cost increase.

In view of the above-mentioned problems of the conventional sludge scraper, the present invention provides a simple mechanism at a position above the water surface, thereby eliminating a driving unit such as a rotating unit and a meshing unit disposed underwater. To ensure that the sludge deposited on the bottom of the sedimentation basin can be scraped smoothly and reliably.
An object of the present invention is to provide a sludge scraper that can be easily maintained and has excellent durability.

[0007]

In order to achieve the above object, a sludge scraper according to the present invention comprises: a two-stage upper and lower rail laid above a sedimentation basin; a moving body moving along the rail; A driving mechanism for reciprocating the moving body, a switching mechanism for forcibly selecting and moving one of the two upper and lower rails according to the moving direction of the moving body,
When the moving body moves along the lower rail, the lower frame is provided with a scraping plate that scrapes sludge settled on the bottom of the pond when the moving body moves along the lower rail.

[0008] This sludge scraper is provided on a lower frame disposed on the moving body when the moving body moving along two upper and lower rails laid above the settling pond moves along the lower rail. A rail in which the moving body is moved by a switching mechanism in which the sludge settled on the bottom of the pond is swept by the scraping plate and one of the upper and lower rails is forcibly selected according to the moving direction of the moving body. When the moving body moves along the upper rail, the scraping plate provided on the lower frame disposed on the moving body is prevented from sliding on the bottom of the pond.

In this case, a plurality of scraping plates are arranged at substantially equal intervals on the lower frame, and the movable body is reciprocated a distance longer than the arrangement pitch of the scraping plates. Sludge can be configured to be sequentially scraped in one direction by a plurality of scraping plates.

Thus, the reciprocating distance of the moving body can be set small, the driving means for reciprocating the moving body can be simplified, and the manufacturing cost of the sludge scraper including the driving means can be reduced. it can.

Further, the moving body may be provided with an upper frame provided with a scraping plate for scraping the scum floating on the water surface when the moving body moves along the upper rail.

Accordingly, the scraping plate provided on the lower frame provided on the moving body does not slide on the bottom of the pond, and the scraping plate provided on the upper frame when the moving body moves along the upper rail. Thereby, the scum floating on the water surface can be scraped, and the sludge settled at the bottom of the pond and the scum floating on the water surface can be alternately scraped without increasing the driving force of the moving body.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sludge scraper according to the present invention will be described below with reference to the drawings. 1 to 5 show one embodiment of a sludge scraper of the present invention. This sludge scraper 2
Is installed in the sedimentation basin 1 provided for sedimenting and separating mud and earth and sand contained in the influent flowing into the sewage treatment plant and the water treatment plant, and is deposited on the pond bottom 11 of the sedimentation basin 1. The sludge is used to scrape the sludge into a sludge pit 12 provided on one side of the sedimentation basin 1. The sedimentation basin 1
Although not particularly limited, in the present embodiment,
The plane shape is formed in a rectangular shape, and the bottom 11 is slightly inclined so that one end (left side in FIG. 1) in the longitudinal direction of the sedimentation basin 1 becomes lower, and drainage when draining the sedimentation basin is performed. A sludge pit 12 is formed at one end of the sludge pit by digging it down in a hopper shape.
After being rushed into the inside, it is discharged to the outside of the sedimentation basin 1 by the sludge pump 7 and treated. In this case, the inflowing water flowing into the sedimentation basin 1 is introduced into the sedimentation basin 1 after being made into a parallel flow by the rectifying wall 8 via the conduit 13.

The sludge scraper 2 is disposed horizontally above the water surface of the sedimentation basin 1, more specifically, horizontally or slightly inclined in accordance with the inclination of the pond bottom 11 of the sedimentation basin 1. Upper and lower 2 laid on rail base 3 arranged on both sides, longitudinal direction
A moving body 21 having step rails 31 and 32, wheels 27 moving along the rails 31 and 32,
Cylinder 26 as drive means for reciprocating the cylinder
A switching mechanism 6 forcibly selecting one of the two upper and lower rails 31 and 32 according to the moving direction of the moving body 21 and moving the moving body 21; Sludge settled on the bottom 11 of the pond when the moving body 21 is arranged to be suspended through the lower stage 31 (moves to the left in FIG. 1 (hereinafter referred to as “outbound”)). The lower frame 22 provided with a scraping plate 22F that rakes the moving body 21 and the moving body 21 arranged to be suspended from the moving body 21 via the cable 25 move the moving body 21 along the upper rail 32 (rightward in FIG. 1). (Hereinafter, referred to as “regression”), the upper frame 23 provided with a scraping plate 23F for scraping scum floating on the water surface. In addition, when the inclination of the pond bottom 11 of the sedimentation basin 1 is gentle, the rail base 3 can be disposed horizontally to facilitate installation work.

In this case, in addition to the hydraulic cylinder, various types of reciprocating drive mechanisms such as a screw rod, a linear motor, a gear rack, and a link can be employed as the hydraulic cylinder 26 as the driving means.

The lower rail 31 of the two upper and lower rails 31 and 32 laid on the rail base 3 has a length obtained by adding at least the total length L of the moving body 21 and the distance S with which the moving body 21 reciprocates. On the other hand, the intermediate member 61 of the switching mechanism 6
The upper rail 32 formed on the upper surface is formed to have a length slightly shorter than the distance S in which the moving body 21 reciprocates.

When the moving body 21 moves forward, the moving body 2
1 is guided to the lower rail 31, and the lower frame 22 and the upper frame 23 descend, and the lower frame 2
The scraping plate 22F provided on the bottom 2 slides on the bottom 11 and the bottom 1
The sludge settled in 1 is swept toward the sludge pit 12 and a scraping plate 2
The 3F is immersed in the water and moves below the scum floating on the water surface without scraping the scum.

On the other hand, when the moving body 21 moves backward, the switching mechanism 6
As a result, the wheels 27 provided on the moving body 21
2, the lower frame 22 and the upper frame 23 rise, and the scraping plate 22F provided on the lower frame 22
Away from the sludge, the sludge settled on the pond bottom 11 is moved without scraping, and the scraping plate 23F provided on the upper frame 23 floats on the water surface and floats on the water surface. The scum is swept toward the scum gap 5 disposed downstream of the sedimentation basin 1.

The structure of the switching mechanism 6 for forcibly selecting and moving one of the upper and lower rails 31 and 32 according to the moving direction of the moving body 21 is particularly limited. However, in this embodiment, as shown in FIG. 4, point pieces 63 and 66 are swingably provided at both ends of an intermediate member 61 having an upper rail 32 formed on the upper surface via swing shafts 62 and 65. And springs 64, 67 for urging the tip of one point piece 63 to contact the lower rail 31 and the tip of the other point piece 66 to be separated from the lower rail 31. To do.

As a result, as shown in FIG. 4A, when the moving body 21 moves forward (moves to the left in FIG. 4A), the wheels 27 disposed on the moving body 21 , And moves on the lower rail 31 to swing one of the point pieces 63 upward against the urging force of the spring 64 to pass below the point piece 63.

Then, when the moving body 21 goes back (FIG. 4A)
At the time of moving rightward), the wheel 27 rides on one of the point pieces 63, passes over the point piece 63, moves on the upper rail 32, and resists the biasing force of the spring 67 on the other side. The point piece 66 is swung downward, passes over the point piece 66, reaches the lower rail 31, and
One process is completed.

On the lower frame 22, a plurality of scraping plates 22F are disposed at substantially equal intervals, and the moving body 21 is moved through the piston rod 26a of the hydraulic cylinder 26 to the scraping plate 22F.
The sludge settled on the pond bottom 11 is sequentially moved in one direction, that is, the sludge pit 12
So that it can be swept towards

In the upper frame 23, a plurality of scraping plates 23F are arranged at a pitch L which is equal to or smaller than the pitch L1 of the scraping plates 22F arranged on the lower frame 22.
2, the moving body 21 is reciprocated by a distance S longer than the arrangement pitch L1 of the scraping plate 22F via the piston rod 26a of the hydraulic cylinder 26, and floats on the water surface. The scum is sequentially raked by a plurality of scraping plates 23F in one direction, that is, toward the scum gap 5 disposed downstream of the sedimentation basin 1.

A weir 14 for preventing the scum floating on the water surface from flowing down is provided at a position on the water surface downstream of the scum gap 5 of the sedimentation basin 1 so as to reach a predetermined depth in the water. A trough 4 for discharging the supernatant water is provided at the water surface position on the side.

Next, the operation of the sludge scraper will be described. By driving the hydraulic cylinder 26 as a driving means and moving the moving body 21 forward, the wheels 27 provided on the moving body 21 are guided to the lower rail 31, and the lower frame 22 and the upper frame 23 descend, The scraping plate 22F provided on the lower frame 22 slides on the pond bottom 11 and rakes the sludge settled on the pond bottom 11 toward the sludge pit 12 and collects the sludge in the sludge pit 12 and at the same time, moves the sludge to the upper frame 23. The provided scraping plate 23F is immersed in the water, and moves below the scum floating on the water surface without scraping the scum (FIG. 1 → FIG. 2).

After the moving body 21 has moved a predetermined distance S,
By switching the driving direction of the cylinder 26 and moving the moving body 21 backward, the switching mechanism 6 causes the moving body 21 to move backward.
Are provided to the upper rail 32, and the lower frame 22 and the upper frame 23 are lifted up.
The rake plate 22F provided at the bottom is separated from the pond bottom 11,
The sludge that has settled on the upper surface is moved without scraping the sludge, and the scraping plate 23F provided on the upper frame 23 floats on the water surface, and the scum floating on the water surface is moved downstream of the sedimentation basin 1. The scum is swept toward the scum gap 5 disposed on the side, and the scum is caused to flow into the tilted scum gap 5 (FIG. 5A → FIG. 5B).

When the moving body 21 moves a predetermined distance S, one stroke is completed. Thereafter, the driving direction of the cylinder 26 is switched, and the same stroke is repeated several times or more. 21, the sludge settled on the pond bottom 11 is sequentially moved in one direction, that is, the sludge pit 1
The scum floating on the surface of the water when the moving body 21 goes back is sequentially moved in one direction, that is, settled by the plurality of scraping plates 23F. The scum is swept toward the scum gap 5 disposed on the downstream side of the pond 1 and flows into the tilted scum gap 5.

The operation of the sludge scraper 2 can be performed at regular intervals or at an arbitrary time, whereby the sludge settled on the bottom 11 of the settling basin 1 and the scum floating on the water surface can be obtained. Can be removed at the same time.

[0029]

According to the sludge scraper of the present invention, when the moving body moving along the upper and lower two-stage rails laid above the settling basin moves along the lower rail, the moving body is arranged on the moving body. By a scraping plate provided on the lower frame installed, the sludge settled on the bottom of the pond is raked, and a switching mechanism that forcibly selects one of the upper and lower rails according to the moving direction of the moving body. Switching the rail on which the moving body moves, when the moving body moves along the upper rail, the scraping plate provided on the lower frame disposed on the moving body can be prevented from sliding on the pond bottom, As a result, even if the inflow water containing a large amount of mud or soil flows into the sedimentation basin at a time while the sludge scraper is stopped or during rainfall, the driving unit is deposited on the bottom of the sedimentation basin. Without being buried in sludge The sludge settled on the bottom of the pond can be scraped smoothly and reliably, and the maintenance unit can be easily performed by eliminating the drive unit such as the rotating unit and the meshing unit arranged in the water. In addition, it is possible to improve the durability of the sludge scraper by reducing the number of failures due to abrasion of the drive unit and the like.

Further, a plurality of scraping plates are arranged on the lower frame at substantially equal intervals, and the movable body is reciprocated for a distance longer than the pitch at which the scraping plates are arranged. By reciprocating the moving body in a single direction by using a plurality of scraping plates, the reciprocating movement distance of the moving body can be set small, and the driving means for reciprocating the moving body can be simplified. The production cost of the sludge scraper including the above can be reduced.

Further, when the moving body moves along the upper rail, the moving body is provided with an upper frame having a scraping plate for scraping the scum floating on the water surface. The scraper provided on the lower frame does not slide on the pond bottom.When the moving body moves along the upper rail, the scraper provided on the upper frame may scrape the scum floating on the water surface. The sludge settled at the bottom of the pond and the scum floating on the water surface can be created without increasing the driving force of the moving body.
Can be swept alternately.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a state in which the moving body has been moved (forward) by a predetermined distance from the state of FIG.

FIGS. 3A and 3B are side cross-sectional views, wherein FIG. 3A shows a state in which the moving body moves along a lower rail, and FIG. 3B shows a state in which the moving body moves along an upper rail.

4A and 4B show an upper rail, a lower rail, and a switching mechanism, wherein FIG. 4A is a front view and FIG. 4B is a side view.

FIGS. 5A and 5B are explanatory diagrams showing the time when the moving body goes home, where FIG. 5A shows the start of the go-back and FIG.

FIG. 6 is a front view of a conventional sludge scraper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sedimentation pond 11 Pond bottom 12 Sludge pit 2 Sludge scraper 21 Moving body 22 Lower frame 22F Scrape plate 23 Upper frame 23F Scrape plate 24 Cable 25 Cable 26 Drive means (hydraulic cylinder) 3 Rail base 31 Lower stage Rail 32 Upper rail 4 Trough 5 Scum gap 6 Switching mechanism 61 Intermediate member 63 Point piece 66 Point piece 7 Sludge pump 8 Straightening wall

Claims (3)

[Claims] 1. A two-stage rail laid above and below a settling basin, a moving body moving along the rail, driving means for reciprocating the moving body, and moving the moving body up and down according to the moving direction of the moving body. A switching mechanism forcibly selecting and moving one of the two rails, and a sludge settled on the bottom of the pond when the moving body moves along the lower rail, which is disposed on the moving body. A sludge scraper comprising a lower frame having a scraper plate for scraping. 2. A plurality of scraping plates are disposed on a lower frame at substantially equal intervals, and a moving body is disposed at a distance longer than a pitch of disposing the scraping plates.
The sludge scraper according to claim 1, wherein the sludge settled on the bottom of the pond is swept in one direction by a plurality of scrapers by reciprocating the sludge. 3. The moving body is provided with an upper frame provided with a scraping plate for scraping scum floating on the water surface when the moving body moves along the upper rail. 2. The sludge scraper according to 2.