JPS6222675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scum scraping device in a settling tank or the like.

As a scum scraping device for scraping up scum floating in a sedimentation tank or the like and collecting it in a scum schema pipe, a device using a rotating schemaer is often used. However, in conventional scum scraping devices, the turning angle of the schema arm is usually narrow, about 45 degrees, making it difficult to scrape over a wide range. Furthermore, with conventional scraping devices, scum is scraped up when the schema arm approaches the scum schema pipe, but when the schema arm returns, the scum cannot be scraped up, resulting in waste. There is.

SUMMARY OF THE INVENTION An object of the present invention is to use a schema arm to collect scum over a wide range of areas, and to enable the scum to be constantly collected during operation of the schema arm.

For this reason, the present invention provides a schema arm that can reciprocate while drawing a substantially half-moon-shaped locus on the opposite side of the scum schema pipe, centering on a vertical axis disposed near and upstream of the scum schema pipe, and A swing arm is fixedly provided on a vertical rotating shaft disposed upstream of the swing arm, a first swinging lever that contacts the swing arm and is spaced apart from the vertical shaft, and one end of which contacts the swing arm. a second swinging lever that is brought into contact with and approaches the vertical axis, and whose other end is spaced apart from the vertical shaft; A cable body is provided that reaches the other end portion of the second swing lever through a sheave, and the schema arm is reciprocated by rotation of the rotation shaft.

Therefore, the rotation angle of the schema arm is set to 180
Not only can it scrape up scum over a wide area, but it can also scrape up scum all the time when the schema arm is operating.
You can collect scum efficiently.

The drawing is a plan view showing an embodiment of the present invention.
In the drawing, 1 is a scum schema pipe having a long hole 4 facing the water flow 3 of the settling tank 2 and opening to the water surface thereof, and communicating with the outside of the settling tank 2. A vertical shaft 5 is disposed near and upstream of the scum schema pipe 1, facing the central portion of the elongated hole 4. One end of a schema arm 6 is attached to this vertical shaft 5, and the schema arm 6 reciprocates about the vertical shaft 5 on the opposite side of the elongated hole 4 in a substantially half-moon-shaped trajectory. It is configured to be movable.

At the bottom of the sedimentation basin 2 upstream of the vertical axis 5,
A rotary sludge scraping rake 7 for scraping up sludge is provided. Reference numeral 8 denotes a drive shaft of the sludge scraping rake 7 as a rotation shaft in the vertical direction, and a swing arm 10 having a roller 9 at its free end is attached. Therefore, this swing arm 10 is
Together with the sludge scraping rake 7, it is rotated in the direction of the arrow 11.

12 and 13 are a pair of swing levers disposed with the drive shaft 8 in between. That is, the swing lever 12 has one end 12a disposed at the swing center 14 position, and the other end 12b abutted against the roller 9 of the swing arm 10 to move from position A to position B, that is, the vertical axis 5 It is configured to be spaced apart from. The swinging lever 13 is arranged such that one end 13a and the other end 13b sandwich the swinging center 15, and the one end 13a is brought into contact with the roller 9 of the swinging arm 10 to move from position C to position D, that is, the above-mentioned upper and lower ends. It is configured to be close to the axis 5. Note that the swing arm 10 and the swing levers 12 and 13 are arranged at different positions in the vertical direction so as not to interfere with each other.

Reference numeral 16 denotes a sheave configured to be able to rotate integrally with the schema arm 6, and around which a wire rope 17 as a cable is wound. One end 17a of this wire rope 17 is connected to the center portion of the swing lever 12, and the other end 17b is connected to the other end 13 of the swing lever 13.
It is connected to part b.

In the above configuration, the swing arm 10 swings,
When the roller 9 comes into contact with the swinging lever 13 at position C, the swinging lever 13 is moved to position D, and the other end 13b pulls the wire rope 17. This causes the sheave 16 to rotate, and the schema arm 6 to move from position E to position F.
The scum on the turning trajectory is sucked into the portion of the elongated hole 4 facing the position F and is discharged to the outside. At this time, the swing lever 12 is also pulled by the wire rope 17 and moved from position B to position A.

When the swing arm 10 further swings and the roller 9 comes into contact with the swing lever 12 that has been moved to position A, the swing lever 12 is moved to position B and the wire rope 17 is pulled. Then, contrary to the above, the schema arm 6 is turned from position F to position E, and the scum on the turning trajectory is sucked into the portion of the elongated hole 4 facing position E and discharged to the outside.
At this time, the other end 13b of the swing lever 13 is pulled by the wire rope 17, and the swing lever 13 is returned from position D to position C.

The above operation is repeated by rotating the rotating arm 10, and the scum is removed.

In the above embodiment, the drive shaft 8 of the sludge scraping rake 7
Since the rotating arm 10 is rotated by
The swing arm 10 and the schema arm 6 can be operated without providing a special power source.

As described above, according to the present invention, not only can the rotation angle of the schema arm be set to about 180 degrees and scum can be collected over a wide range, but also scum can be constantly collected when the schema arm is in operation. Therefore, scum can be scraped up efficiently.

[Brief explanation of the drawing]

The drawing is a plan view showing a schematic configuration of an embodiment of the present invention. 1... Scum schema pipe, 5... Vertical axis,
6... Schema arm, 8... Drive shaft (rotating shaft), 10... Swivel arm, 12, 13... Rocking lever, 13a... one end, 13b... other end, 16
...Sheave, 17...Wire rope (rope body).

Claims (1)

[Claims] 1. A schema arm is provided on the opposite side of the scum schema pipe that can reciprocate in a substantially half-moon-shaped trajectory centering on a vertical axis located near and upstream of the scum schema pipe, and is arranged upstream of the vertical axis. A swing arm is fixedly provided on a rotating shaft in the vertical direction, and a first swinging lever that is in contact with the swing arm and is spaced apart from the vertical shaft; a second swinging lever that is brought close to the shaft and whose other end is spaced apart from the vertical shaft; . A scum scraping device, characterized in that a cable is provided that reaches the other end of the second swing lever, and the schema arm is reciprocated by rotation of the rotation shaft.