JP4311825B2 - Scum remover - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scum removing device provided in a settling basin such as a sewage treatment plant, and more particularly to a device provided with means for preventing water leakage into a trough.
[0002]
[Prior art]
FIG. 4 is a sectional view of a conventional scum removing device provided in a sedimentation basin such as a sewage treatment plant, and is a longitudinal section parallel to the direction of movement of the scum (the direction of the arrow indicated by the numeral 1 in FIG. 4). It is shown as
[0003]
As shown in FIG. 4, the trough 1 is provided on the water surface portion of the settling basin a and has an opening 1 a for allowing the scum to flow from the settling basin a in addition to opening on the upper surface, and the scum S is a scraper. When it is scraped by b, the gate 2 in the closed position indicated by the solid line is rotated to the open position indicated by the chain line in the direction of the arrow indicated by the reference numeral 2 in FIG. The scum S is configured to flow into the trough 1.
[0004]
The lower end of the gate 2 is connected by a lower side wall 1b that forms the lower side of the opening 1a of the trough 1 and a sheet-like flexible connecting member 3 that also serves as a sealing member made of synthetic rubber or natural rubber. ing. Therefore, the gate 2 is driven by a driving mechanism (not shown) attached to a mounting portion 2a provided on the upper end side of the gate 2 with a driving mechanism (not shown), so that the connection member 3 is centered. It is possible to rotate between a closed position indicated by a solid line in FIG. 4 and an open position indicated by a two-dot chain line.
[0005]
5 is an enlarged perspective view of one end of the trough 1, the gate 2 and the connecting member 3 shown in FIG. 4 (in the illustrated example, the right end when the trough is viewed from the settling basin in FIG. 4). FIG. As shown in FIG. 4, the connecting member 3 has a bottom surface portion that prevents the inflow of water from between the lower side of the gate 2 and the lower side wall 1 b of the trough. It has a side surface portion 3 a that prevents inflow of water from between the side and the side walls 1 c of the trough 1. Therefore, the connecting member 3 can effectively prevent water leakage into the trough from between the lower side and side of the gate 2 and the periphery of the opening 1a of the trough 1.
[0006]
In FIG. 5, reference numerals 4a and 4b denote contact plates for attaching the side surface portion 3a to the trough 1 and the gate 2, respectively. That is, the side surface portion 3a of the connecting member 3 is attached by the bolt and nut B in a state of being interposed between the contact plate 4a and the trough 1 and between the contact plate 4b and the gate 2 respectively. Further, portions other than the side surface portion 3a (bottom surface portion) of the connecting member 3 are also attached to the trough 1 and the gate 2 using the abutment plate, but are omitted here.
[0007]
[Problems to be solved by the invention]
However, since the connecting member 3 is made of rubber in the above-described conventional scum removing device, it has a property that deterioration easily proceeds due to aging (deterioration) and rotation of the gate. Therefore, when the connecting member is damaged, water leaks from the damaged portion to the trough, resulting in a disadvantage that the scum concentration is lowered and the load of the subsequent scum treatment is increased.
[0008]
Accordingly, the present invention has been made to solve the above-described drawbacks, and the object of the present invention is to remove scum that can reliably prevent water leakage to the trough while maintaining good gate rotation. To provide an apparatus.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided between the lower end of the gate and the lower side wall forming the lower side of the trough scum inflow opening, and on both sides of the gate and both sides of the opening of the trough. A sealing member that maintains a watertight state between both side walls forming a side, and the upper end of the gate extends from a closed position where the upper end of the gate stands above the water surface of the settling basin around the horizontal axis. In the scum removing device for turning the scum floating on the water surface of the settling basin into the trough by rotating to an open position where the water sinks below the water surface, a watertight bearing that does not allow water to pass under the gate provided with a said continuous along the lower side and both sides of the opening portion of the trough in the sealing member, and protrudes to the gate side of the lower wall and side walls of the opening, rotating the closed position It is characterized by using those in close contact with the gates.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the same structural member shown by the said FIG.4 and FIG.5.
[0011]
FIG. 1 (a) is a longitudinal sectional view of a trough of a scum removing device according to an embodiment provided in a settling basin a such as a sewage treatment plant, and FIG. 1 (b) shows a gate and trough in a closed position. It is an expansion perspective view of one side edge part.
[0012]
As shown in FIG. 4, the trough 1 is provided on the water surface portion of the settling basin a, and when the scum is scraped by a scraper (not shown), the gate 2 has a lower end as indicated by an arrow. The scum is made to flow into the trough 1 by rotating to the open position around the horizontal axis of the section.
[0013]
The gate 2 is rotatably provided via a watertight bearing 10 whose lower end is provided in the vicinity of the opening 1 a of the trough 1. As shown in an exploded view in FIG. 2, the watertight bearing 10 includes an I portion 10a having a circular outer periphery provided on the gate 2, and an outer periphery provided on the trough 1 that is the same as the outer periphery of the I portion 10a. A clevis portion 10b having a circular shape and a cylindrical portion 10c provided between the clevis portion 10b and having the same circular shape as the outer periphery, and through holes provided in the I portion 10a, the clevis portion 10b and the cylindrical portion 10c. It is comprised from the spindle 10d hold | maintained. Accordingly, the watertight bearing 10 is formed in a circular shape, as shown in FIG. 1A, in the shape of the lower portion of the gate 2 that is cross-sectionalized in the direction perpendicular to the longitudinal direction of the support shaft 10d. It is configured to be received and abutted by an L-shaped seal member 11 provided fixed to the trough 1.
[0014]
The seal member 11 is made of a synthetic resin such as MC nylon, and is attached to the trough 1 via the support member 12 so that the lower portion of the gate 2 is positioned inside the L shape. Therefore, the lower portion of the gate 2 is in contact with the seal member 11 at two locations. That is, one contact location is on the vertical surface of the seal member 11 and the other contact location is on the horizontal plane of the seal member 11 to enhance water tightness.
[0015]
In the figure, reference numeral 13 denotes a sealing member made of the same material as the sealing member 11, which is continuous along the periphery of the opening 1 a of the trough 1 and is attached via a contact plate 14. That is, the seal member 13 forms a lower side wall 1b that forms the lower side of the opening 1a as shown in FIG. 1A and both sides of the opening 1a as shown in FIG. 1B. Both side walls 1c (FIG. 1 (b) shows only one side of the opening, but the other side is configured in the same manner) so as to protrude from these walls to the gate side. (Refer to the seal member 13 indicated by the chain line in FIG. 1 (b)).
[0016]
Therefore, when the gate 2 is in the closed position shown by the solid line in FIG. 1A, the seal member 13 is in close contact with the back surface of the gate 2 so that the opening 1a of the trough 1 is completely sealed and the scum is not removed. It is possible to reliably prevent the water in the settling tank a from entering the trough 1 during standby.
[0017]
In FIG. 1B, reference numeral 15 denotes an end face of both sides of the gate 2 (only one side of the gate 2 is shown in FIG. 1B, but the other side is similarly configured). This is a seal member made of the same material as that of the seal members 11 and 13 provided at 2 '. That is, the seal member 15 is provided over the longitudinal direction of the end surface 2 ′ of the gate 2. And this sealing member 15 is comprised so that it may always contact | abut to the side plate 1 'extended from the side surface of the trough 1 to the sedimentation basin side. Therefore, at any position between the closed position and the open position of the gate 2, the both sides of the gate 2 are maintained in a watertight state, and the inflow of water from both sides of the gate 2 can be effectively prevented.
[0018]
In FIG. 1B, the watertight bearing provided between the lower end of the gate 2 and the trough 1 is omitted for the sake of simplification of the drawing. Thus, the watertight state is maintained by the seal member 11.
[0019]
FIG. 3 is a cross-sectional view showing another example of the watertight bearing. The watertight bearing 10 ′ shown here is configured such that the lower end 2 ″ of the gate 2 slides on a seal member 11 ′ having an arc surface, that is, a fan-shaped arc portion of the fan-shaped seal member 11 ′. The gate 2 is provided so that the rotation center position of the gate 2 coincides with the main part of the sector, that is, the center position 11 ″ of the arc.
[0020]
Also in this watertight bearing 10 ′, the lower end 2 ″ of the gate 2 can always come into contact with the arc portion of the fan-shaped seal member 11 ′, so that water in the settling basin a inadvertently flows into the trough 1. Can be prevented.
[0021]
【The invention's effect】
According to the present invention, since the watertight bearing that does not allow the passage of water is provided at the lower part of the gate, the rotation of the gate can be maintained well. Further, the seal member is continuous along the lower side and both side sides of the opening of the trough, and protrudes from the lower side wall and both side walls of the opening to the gate side so as to adhere to the gate rotated to the closed position. since use of which, it is possible to reliably prevent water leakage into the trough from between the periphery of the opening of the lower and side edges and the trough of the gate, when the gate closed, reliably sealing the opening of the trough can do. In other words, it is possible to reliably prevent the trough from leaking in a state where the rotation of the gate is well maintained.
[Brief description of the drawings]
FIG. 1A is a longitudinal sectional view of a trough of a scum removing device according to an embodiment of the present invention, and FIG. 1B is an enlarged perspective view of a portion of one end of the trough.
FIG. 2 is an exploded perspective view of a watertight bearing.
FIG. 3 is a cross-sectional view showing another example of a watertight bearing.
FIG. 4 is a cross-sectional view for explaining a conventional scum removing device.
5 is an enlarged perspective view of one end portion of the trough shown in FIG. 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Trough 1 'Side plate 2 Gate 2' End surface 10, 10 'Watertight bearing 11, 11' Seal member 12 Support member 13 Seal member (2nd seal member)
15 Seal member

Claims (1)

Watertight state between the lower end of the gate and the lower side wall forming the lower side of the trough scum inflow opening and between the side end of the gate and the side walls forming the side sides of the opening of the trough A sealing member that keeps the gate at a closed position where the upper end of the gate stands above the water surface of the settling basin around a horizontal axis to an open position where the upper end of the gate sinks below the water surface. In the scum removing device that moves the scum floating on the water surface of the settling basin into the trough,
A watertight bearing that does not allow passage of water is provided at the lower part of the gate , and is continuous with the sealing member along the lower side and both side sides of the opening of the trough, and from the lower side wall and both side walls of the opening. A scum removing device using a device that protrudes toward the gate and is in close contact with the gate rotated to the closed position.

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