JPH05289A - Scum skimmer - Google Patents

Abstract

PURPOSE:To surely return a scum skimmer to a neutral position by recovering the floated scum in a sedimentation basin on both of the upstream and downstream sides of the scum skimmer. CONSTITUTION:An operation mechanism 5 performing tilting in an upstream direction and an operation mechanism 6 performing tilting in a downward direction are provided to a tiltable scum skimmer 3 recovering the floated scum in a sedimentation basin 1 and a wt. type neutral return mechanism 7 returning the scum skimmer 3 to a neutral position is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scum skimmer that collects scum floating in a sedimentation basin from both the upstream side and the downstream side of the scum skimmer to reliably return the scum skimmer to a neutral position.

[0002]

2. Description of the Related Art Conventionally, as a device for rotating a skimmer, a device disclosed in Japanese Patent Publication No. 54-25678 is well known. In this known example, the scum floating on the upstream side of the pipe scum skimmer is collected by tilting the pipe scum skimmer upstream. However, even if the scum floating on the upstream side of the scum skimmer could be treated by this method, it was impossible to recover the scum floating on the downstream side. Therefore, in order to collect scum on the upstream side and the scum on the downstream side at the same time, a method of rotating the scum skimmer on both the upstream side and the downstream side has been proposed and put into practical use.

[0003]

In the method of rotating the scum skimmer, it is necessary to return the scum skimmer to the neutral position after collecting the floating scum. For this reason, conventionally, a method is generally used in which a weight is provided so as to protrude from the scum skimmer, and the scum skimmer is returned to the neutral state by balancing the weight. However, in this balance weight method, the restoring force changes depending on the rotation angle of the scum skimmer, and the restoring force decreases near the neutral position, making it difficult to reliably return to the neutral position. To prevent this, the weight is projected so that the returning force remains even at the neutral position of the scum clearance,
At the neutral position, it can be forcibly stopped by the stopper. However, this is effective only in the system in which the scum skimmer is rotated only on one of the upstream side and the downstream side, and cannot be applied to the system in which the scum skimmer is rotated in both the upstream side and the downstream side.

In the present invention, it is an object of the present invention to reliably restore the neutral position by preserving the restoring force in the vicinity of the neutral position even when the scum skimmer is rotated in both the upstream and downstream directions.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and includes a tilting type scum skimmer for collecting scum floating in a sedimentation basin and an operating mechanism for tilting upstream. , With an operating mechanism for tilting to the downstream side,
The gist of the present invention is to provide a weight-type neutral return mechanism that returns the scum skimmer to the neutral position on the intermediate shaft that serves as a support shaft for both operating mechanisms.

[0006]

[Function] The scum skimmer has a restoring force that is engaged with the scum skimmer operating lever via the fixed link protruding from the scum skimmer and the lever connected to the scum skimmer, and the scum skimmer is in a neutral position on the shaft pivotally supporting the lever. Since the protrusion angle of the weight is determined so as to give the weight, it is possible to reliably return to the neutral position even after the scum skimmer tilts to either the upstream or downstream side.

[0007]

The present invention will be described below with reference to the illustrated embodiments. In the figure, 1 is a settling basin having a required size and shape, and this settling basin 1 is provided with a sludge scraper 2 for scraping the sludge settling on the bottom of the settling basin. This sludge attractor 2 is configured such that a required number of flights 22 are attached to an endless chain 21 stretched around a sprocket wheel (not shown), and the chain 21 is driven along a pond bottom by a drive device. A scum skimmer 3 is provided downstream of the settling basin 1.
The pipe-shaped scum skimmer 3 is rotatably supported by bearings 31, 31 provided on the inner surface of the side wall of the sedimentation tank 1, and a scum inlet 3H is provided on the outer peripheral surface thereof.

The flight 22 includes a striker 23 for upstream operation for tilting the scum skimmer 3 upstream and a downstream operation for tilting downstream as shown in FIG. Striker 2
4 and 4 are projected at a predetermined interval, and flight 2
A scum skimmer operating mechanism 4 is provided in the scum skimmer and the settling basin 1 for rotating the scum skimmer 3 upstream and downstream in accordance with the movement of 2.

The scum skimmer operating mechanism 4 is a mechanism 5 for inclining upstream of the settling tank 1 and a mechanism 6 for inclining it downstream.
Composed together with. The mechanism 5 for inclining to the upstream side pivotally attaches a link 52 to a fixed link 51 protruding from the end of the scum skimmer 3, and the lever 5 is attached to the end of the link 52.
3, the lever 53 is projected on the outer shaft 55, and the upstream operation lever 56 is further projected on the outer shaft 55. The pipe-shaped outer shaft 55 is provided in the sedimentation tank 1. It fits on the intermediate shaft 54 which is arranged and supported in parallel with the scum skimmer 3.
It is rotatably supported.

On the other hand, similarly to the mechanism 5, the mechanism 6 for inclining to the downstream side also has a link 62 pivotally attached to a fixed link 61 projecting from the end of the scum skimmer 3, and this link 62 is connected to the intermediate shaft 5.
The lever 63 is pivotally mounted on a lever 63 projecting from a part of the shaft 4, and a downstream operation lever 64 is projected on the intermediate shaft 54.

The upstream and downstream operation levers 5 are also provided.
The neutral return mechanism 7 is provided between the outer rings 73 that are fitted and integrally supported by the outer shaft 55 and the intermediate shaft 54 that project the projections 6, 64. The neutral return mechanism 7 of the scum skimmer 3 is shown in FIGS.
As will be described in detail in FIG. 2, the outer shaft 55 rotatably fitted to the intermediate shaft 54 is provided with a returning rod 72 separately from the operating lever 56, and the intermediate shaft 54 is also provided with a returning rod 71. ,
Both of the action rods 71 and 72 are bent so that their tips are opposed to each other, and the tip portions 71a and 72a are arranged so as to face the weight support rod 74 projecting from the outer ring 73 and to abut when necessary. A weight support rod 74 having a required length is provided with a weight 75 having a required weight.

The operation of the scum skimmer of the present invention constructed as described above will be described below. When the scum skimmer 3 is in the neutral state as shown in FIGS. 1 and 2, the scum suction port 3H is in the upward state as shown. When the flight 22 provided in the chain 21 moves along the bottom of the pond by the operation of the sludge attractor 2, the striker 23 protruding from the flight has the upstream operation lever arranged on the movement locus of the striker 23. When it comes into contact with 56, the operation lever 56 is pushed by the movement of the striker 23 as shown in FIGS. 2 to 3, and the lever 56 swings around the outer shaft 55 which is a fulcrum. The swing of the actuating lever 56 causes the scum skimmer 3 protruding from the fixed link 51 to rotate upstream of the pond through the lever 53, the link 52, and the fixed link 51 from the outer shaft 55. At this time, the weighted support rod 74 is pushed up by the tip 72a of the action rod 72 provided on the outer shaft 55. As shown in FIG. 2, the weight support rod 74 has a scum clearance 3
Even in the neutral position, the protruding position should be determined so that the torque from the weight acts on the scum clearance. Therefore, since the torque due to the gravity of the lifted weight is always applied to the scum skimmer 3, when the striker 23 is disengaged from the lever 56, the torque due to the weight is applied to the scum skimmer and is forcibly returned to the neutral position. In this case, the returning force by the weight acts so that the scum clearance is surely in the neutral position.

Further, in FIG. 5, when the scum skimmer 3 is turned to the downstream side, the lever 24 is pushed by the striker 24 for the downstream side operation and tilted in the opposite direction to the upstream side, and similarly, the lever and the link are connected. And the like.

8 and 9, the return mechanism for returning to the neutral position is provided on the scum skimmer 3 so as to project on the fixed link 51 for upstream operation and the fixed link 61 for downstream operation, respectively. In the embodiment in which 82 is locked and the weight 9 is fastened to the lower ends of the cords 81 and 82, there is an advantage that a larger rotation moment can be obtained as compared with the link lever type.

In the embodiment shown in FIG. 8, the lower ends of the two cords 81 and 82 are fastened to the same weight 9, and the same weight is returned to neutral regardless of whether the scum skimmer 3 tilts in the upstream or downstream direction. Although it acts as an application, FIG.
In the embodiment, another weight 9 is attached to the two cords 81 and 82,
9 is fastened, and the operation is similar to that of the embodiment of FIG.

[0016]

According to the present invention, the scum skimmer operating lever is engaged through the fixed link projecting from the scum skimmer and the lever linked to the fixed link, and the weight is projected on the shaft that pivotally supports the lever. Even when the scum skimmer is in the neutral position, the protruding angle of the weight is set so as to give the scum skimmer a restoring force, so there is an advantage that the scum skimmer can surely return to the neutral position even after tilting to the upstream side or the downstream side. ..

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a state in which a scum skimmer of the present invention is installed in a sedimentation basin.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory diagram of a state in which the scum skimmer is tilted to the upstream side.

FIG. 4 is an explanatory diagram showing the operation toward the downstream side.

FIG. 5 is an explanatory diagram showing a state at the time of tilting.

FIG. 6 is a front view of a neutral return mechanism.

FIG. 7 is a side view of the same.

FIG. 8 is an embodiment diagram of a system in which a weight is suspended by a cord.

FIG. 9 is a diagram of a different embodiment.

FIG. 10 is an explanatory diagram of a known example.

[Explanation of symbols]

 1 Settling basin 22 Flight 23, 24 Striker 3 Scum skimmer 4 Scum skimmer operating mechanism 5 Upstream side operating mechanism 6 Downstream side operating mechanism 7 Neutral return mechanism

Claims (1)

Claim: What is claimed is: 1. A tilting type scum skimmer for collecting scum floating in a sedimentation pond, comprising an operating mechanism for tilting to an upstream side and an operating mechanism for tilting to a downstream side. A scum skimmer having a weight-type neutral return mechanism for returning the scum skimmer to the neutral position.