JPS5835110B2 - Scum removal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scum removal device for a rotary sludge scraper installed in a circular sedimentation tank, and particularly to a scum removal device for a rotary sludge scraper installed in a circular settling tank, and in particular, to determine when and when the opening of the scum box is placed under the water surface. This invention relates to a scum removal device that allows adjustment of retention time.

= In general, a circular settling tank equipped with a rotary sludge scraper is equipped with a scum box to remove scum, which is sludge floating on the water surface, and the scum is taken into the scum box and removed. A scum removal device is installed.

In this scum removal device, scum is collected in an opening formed in a scum box by a scum skimmer that rotates together with the rectifier tube of the scraper, and when the scum is collected, the opening is placed under the water surface to remove the scum. .

Conventionally, this type of scum removal device was developed in U.S. Pat. No. 51-54
No. 549, "Floating object removal mechanism" has been proposed.

This scum removal device is equipped with a striker that rotates around the vertical axis of a rotary sludge scraper installed in a settling tank, and a lever provided on a rotatable scum box is moved by the striker, thereby removing the scum from the scum box. The opening of the tank is placed under the water surface, and the scum is sucked into the opening and removed.

However, in the conventional device as described above, the lever is fixedly attached to the scum box, and the timing of putting the opening of the scum box under the water surface and the time to maintain that state can be easily adjusted on the ice. I couldn't do that.

Therefore, there was a problem in that it was not possible to quickly adapt to the situation in which scum was being collected in the sedimentation basin, or to respond to an incident with the amount of scum.

In view of the above-mentioned conventional problems, the present invention provides a scum box that can easily adjust when to put the opening of the scum box under the water surface and how long the opening remains under the water surface. The purpose is to provide a removal device.

In order to achieve the above object, the scum removal device according to the present invention has a length-adjustable lever attached to the rotation shaft of the scum box installed in the radial direction of the circular sedimentation tank and rotatably supported, and further The angle of attachment of the lever to the rotation shaft can also be adjusted.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the scum removal device according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, an electric motor 3 with a reduction gear is attached to the circular sedimentation basin 1 at the center of a girder 2 extending over its upper surface.

A rectifier tube 5 and a scraper 6 for stirring the sludge settled on the lower surface of the settling tank 1 are attached to the drive shaft 4 of the electric motor 3, and the rotation of the drive shaft 4 causes the rectifier tube 5 and the scraper 6 to rotate. ing.

The straightening tube 5 is provided with a scum schema 7 that protrudes in the radial direction and is attached to the water level to scrape up scum on the water surface, and below the water surface is provided with a scum box that comes into contact with a lever to be described later. A striker 8 that rotates is attached.

The striker 8 is formed with a bent tip so as not to interfere with the rotation of the lever.

A bracket 9 is attached to the side wall of the sedimentation tank 1 toward the center of the sedimentation tank 1, and a bearing 10 is provided on the front end surface of the bracket 9.

This bearing 10 includes a rotatable cylindrical scum box 1.
1 is installed.

A rotating shaft 12 integrally protruding from one end of the scum box 11 is mounted on the bearing 10 and
The other end is rotatably attached to a discharge pipe 13 led out of the settling tank 1.

Scum box 1 supported between bearing 10 and discharge pipe 13
1 is installed in the radial direction of the sedimentation basin 10 in its attached state.

Further, an opening 14 is formed in the scum box 11, and the scum flowing in through the opening 14 is discharged from the discharge pipe 13.

A lever 16 is attached to the rotation shaft 12 of the scum box 11 via a boss portion 15.

A set screw 17 is attached to the boss portion 15, and the lever 16 can be attached to the scum box 11 with the set screw 17 so that its angle can be adjusted.

That is, in FIG. 3, the mounting position of the lever 16 can be changed as appropriate within a plane orthogonal to the rotation axis 12.

Further, the lever 16 is formed in a hollow shape, and an inner cylinder 18 is inserted into the lever 16 from the upper end surface in FIG.

The inner cylinder 18 can be fixed in a state where it protrudes appropriately from the lever 16 by means of a set screw 19, and the length of the lever 16 can be adjusted.

In addition, 20 in the figure is a weight.

The scum removing device configured in this way is operated by a striker 8 that is rotated by the drive of the electric motor 3.

That is, in FIG. 3, the striker 8 moving from the left strikes the lever -16, and the lever 16
2 in a counterclockwise direction.

As the lever 160 rotates, the scum box 11 is similarly rotated counterclockwise, and its opening 14 is placed below the water surface.

At that time, the scum schema 7, which rotates with the rectifier cylinder 5 and scrapes up the scum on the water surface, moves the scum to the opening 1.
The scum that has entered the opening 14 is discharged from the discharge pipe 13.

When the striker 8 comes off the lever 16 and is pulled out to the right in FIG. 3, it is returned to its original state by the weight 20 attached to the lower surface of the scum box 11.

In the scum removal device operated in this manner, the length of the lever 16 is made variable by attaching the inner tube 18, and the lever 16 once submerged under the water surface is attached to the scum box 11 by the striker 8. By adjusting the balance with the weight 20, the scum box 1
This means that the time during which the opening 14 of No. 1 is under the water surface can be adjusted.

The lever 16 also has a set screw 17 around the rotation shaft 12.
Since it is possible to change the mounting angle, it is possible to adjust the time when the striker 8 starts contacting the 17 bar 16, that is, the time when the opening 15 goes under the water surface.

Moreover, the length of the lever 16 and the mounting angle of the lever 16 can be easily changed by operations on the water surface, since the levers 16 are mounted at locations above the water surface.

As described above, in the scum removal device according to the present invention, the length of the lever for rotating the scum box can be adjusted, and the angle at which the lever is attached to the rotation shaft can be adjusted, so that the scum box can be opened. It is possible to adjust the time for which the part remains under the water surface, or it is possible to adjust the time when the opening part is under the water surface.

As a result, scum removal work can be performed flexibly depending on the flow of scum in the settling tank and the amount of scum.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a sedimentation tank using the scum removal device according to the present invention, Fig. 2 is a sectional view of the scum removal device, and Fig. 3
The figure is a side view of FIG. 2. 1... Sedimentation basin, 11... Scum box, 12... Rotating shaft, 14... Opening,
16...Lever.

Claims (1)

[Scope of Claims] 1. A scum removal device characterized in that a length-adjustable lever is attached to the rotation shaft of a scum box installed in the radial direction of a circular sedimentation tank and rotatably supported. 2. The scum removing device according to claim 1, wherein the lever is attached to a rotating shaft so that its attachment angle can be adjusted.