JPS584636Y2 - Scum removal equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for removing scum floating on the water surface of a sedimentation tank in a sewage treatment system, and uses only the power of the scum scraping plate to remove scum and surface water without using any other power or external force. This paper proposes a scum removal device that can simultaneously drain scum.

□ An embodiment of the present invention will be explained below based on the drawings. Figures 1 and 2 show the overall structure, 1 is a sedimentation tank, 2 is
is a paper drive shaft provided in the center of the sedimentation tank 1, and is rotated via a mold part reduction gear 3.

Reference numeral 4 denotes a center well provided on the upper part of the rotary drive shaft 3, and from the periphery of the center well, a scum scraping plate 5 located at a level equivalent to the water surface of the sedimentation tank extends radially westward from the center of the shaft 2. (゛・ru.

A scum box 6 is installed around the periphery of the sedimentation tank 1, and is located directly below the movement trajectory of the tip of the scum scraping plate 5, and a scum discharge pipe 7 connected to the bottom communicates with the scum pit 8. ing.

The top surface of the scum box 6 is open and is set to be always above the water surface.

Reference numeral 9 denotes a sludge scraping plate whose lower end is provided at a position where it is almost in contact with the bottom surface of the sedimentation basin 1, and is attached to the lower part of the rotary drive shaft 2 and fixed to the frame 10 extending in the radial direction.

11 is a sludge pin provided at the center bottom of the settling tank 1.

FIGS. 3 and 4 show the detailed structure of the scum box 6. For example, the scum box 6 has a square configuration, and the scum scraping plate 5 rotates while being in close contact with the side surface along the moving direction. A plate 12 is provided, and a side opening 13 is provided on the side surface of the scum box 6 in contact with the rotating plate 12 in an appropriate range in the rotating direction of the rotating plate.

The rotary plate 12 has, for example, five protrusions 14 on its circumference for engaging with the scum scraping plate 5, and the same number of drainage holes 15 for communicating with the side openings 13 during rotation, When the rotary plate 12 is stopped, one of the protrusions 14a protrudes above the water surface so as to be able to engage with the scum scraping plate 5, and the discharge hole 15 is in a closed state where it does not communicate with the side opening 13. It is in.

Next, its operation will be explained.

As shown in FIG. 1, the scum scraping plate 5 is curved so that its tip becomes retarded, and as it rotates around the rotary drive shaft 2, scum on the water surface is collected at the tip. The collected scum passes above the scum box 6.

and a protrusion 14 on which the scum scraping board 5 protrudes above the water surface.
a and rotate it in the direction of the arrow to open the discharge hole 15.
a communicates with the side opening 13 and maintains this state for a predetermined range.

Therefore, the scum gathered above the scum box 6 by the scum scraping plate 5 is discharged to the scum pin 8 through the scum discharge pipe 1 together with the surface water flowing in through the drainage hole 15a.

After the scum scraping board 5 has passed, the drain hole 15a
is in the same position as in Fig. 4, passing through the side opening 13, and the side opening 13 is closed by the rotary plate 12, and the next protrusion 14 also protrudes above the water surface as in Fig. 4. in position.

In order to ensure the position of the rotary plate drainage hole 15 with respect to the side opening 13, for example, a cam and a spring body are used in combination to forcibly rotate the rotary plate by a predetermined angle after the rotary plate has been rotated by a predetermined angle to the next position. It's okay.

As described above, according to the present invention, when the scum scraping plate scrapes up scum above the scum box, the rotating body is rotated by the power of the scum scraping plate, and the side opening is communicated with the drainage hole of the rotating plate. However, since it is discharged together with the surface water that flows in through the drainage hole, no separate power or external force is required to rotate the rotating body.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are a plan view and a vertical sectional view showing the overall configuration, and FIGS. 3 and 4 are a partially cutaway front view and side view showing the main parts. It is. 1... Sedimentation pond, 5... Scum scraping board,
6...Scum box, 7...Scum discharge pipe, 12...Rotary plate, 13...Side opening, 14...Protrusion , 15... Drain port.

Claims (1)

[Scope of utility model registration request] A scum box whose top opening is located above the water surface below the movement trajectory of the scum scraping plate and whose bottom part is connected to a scum discharge pipe is provided in the sedimentation basin, and a direction along the moving direction of the scum scraping plate of the scum box. A rotating plate is provided on the side surface of the scum box, a side opening is provided in an appropriate range in the rotating direction of the rotating plate on the side surface of the scum box in contact with the rotating plate, and a plurality of drainage holes are provided in a local part of the rotating plate, the same number as the plurality of protrusions, When the opening is closed by the rotating plate and the rotating plate is in a stopped state, when the moving scum scraping plate hits and pushes the protrusion protruding above the water surface, the drainage hole of the rotating plate closes to the side opening. 1. A scum removal device characterized in that it is configured to communicate with the scum removal device.