JPS6143595Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a scum removal device that combines a scum schema and a submerged scum box in a sludge thickening tank, and particularly to an opening/closing device for the submerged scum box.

In conventional submerged scum boxes, the opening/closing device for the inlet has a complicated structure, such as one using a spring, and is therefore expensive and has the risk of malfunction. Another problem was that the opening degree and operating time are mechanically fixed, making it difficult to change them.

In view of these problems, the present invention aims to provide an opening/closing device for a submerged scum box that has an extremely simple mechanism and can change the opening degree and operating time by replacing one component.

In this invention, a partition plate that opens and closes the inlet provided on one side wall of the scum box is attached to the swinging arm, and an operating lever that rotates in conjunction with this swinging arm is placed in the movement path of the scraping arm of the scum keema. The operating lever is provided with a cam surface that is engaged by a scraping arm that moves toward the scum box, and when the scraping arm reaches the vicinity of the scum box,
This provides an opening/closing device in which an operating lever is rotated and a partition plate is rotated via a swinging arm to open an inlet.The opening and operation of the partition plate can be adjusted by replacing the operating lever. Time can be changed.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 1 denotes a rotating body provided at the center of a circular sludge thickening tank, and a sludge scraping arm 2 extending in the radial direction is provided at the bottom of the rotating body. It is being 3 is a rotary body 1 disposed between the rotary body 1 and an annular scum trough 4 disposed near the outer periphery of the tank.
Support members 6a and 6b, which are scum keema that rotate together with the sludge scraping arm 2, are erected from the sludge scraping arm 2.
It consists of a scum scraping arm 5 supported so as to be positioned above the water surface, and a scraping plate 7 attached to the scum scraping arm 5 so as to be partially submerged below the water surface. The scum keema 3 has an inclined portion 3a located at a longitudinally intermediate portion of the scum keema 3, which is positioned toward the rear side in the rotational direction as it moves radially outward. Also, the free end 5 of the scum scraping arm 5
a projects outward from the scum trough 4 in the radial direction. Reference numeral 8 denotes a submerged scum box disposed inside the scum trough 4 in the radial direction, in which an inlet 9 opening facing the water surface is formed on one side wall, and a partition plate 10 for opening and closing the inlet 9 is connected to the scum box. It is attached to a swinging arm 11 which is swingably supported by a swing arm 8 . The swinging arm 11 is connected to the scum box 8.
It is fixed with a key 13 to a rotary shaft 12 which is constructed across the upper ends of a pair of radially opposed side walls of the tank and is rotatably supported. One end 12a of the rotary shaft 12 on the radially outer side of the tank penetrates the side wall and protrudes radially outward from the scum trough 4. The intermediate position of the operating lever 14, which is disposed along the line, is fixed. At one end of the operation lever 14, that is, at the end in the direction in which the scum scraping arm 5 approaches as it rotates, a rotating shaft 12 is arranged in an upwardly chevron-shaped manner so as to rotate in the direction in which the partition plate 10 opens. Projecting cam surface 1
5 is formed, and a partition plate 10 is connected to the inlet 9 at the other end.
A balance weight 16 is attached to close the inlet 9 by pressing it toward the side. 17
is a bearing of the rotary shaft 12 fixed to the side wall of the scum box 8, and 18 is a scum discharge pipe extending from the bottom of the scum box 8. The outer part 3b of the scum keema 3, which is radially outer than the inclined part 3a, is bent with respect to the inclined part 3a so as to extend substantially parallel to the side wall of the scum box 8, which faces the side wall in the circumferential direction of the tank. In the outer portion 3b, the scraping plate 7 is constituted by a scraping rocking plate 7a that is swingable so as to be able to climb over the scum box 8.
The other parts are fixed to the scum scraping arm 5. Reference numerals 19 and 20 denote guides for swingingly guiding the scraping swing plate 7a extending diagonally downward from both sides of a pair of circumferentially opposing side walls of the scum box 8. Note that instead of the balance weight 16, a spring or the like may be used for biasing.

In the above configuration, the sludge scraping arm 2 rotates as the rotating body 1 rotates, and the scum keema 3 also rotates on the water surface, and the scraping plate 7 moves the sludge scraping arm 2 to collect the sludge on the water surface. is pushed and brought together in the circumferential direction, moved radially outward of the tank at the intermediate inclined portion 3a, and gradually gathered in front of the outer portion 3b. When the scum keema 3 reaches the vicinity of the scum box 8, the free end 5a of the scum scraping arm 5 rides on and engages the cam surface 15 at one end of the operating lever 14, as shown by the imaginary line in FIG. Then, the operating lever 14 is rotated downward, and the partition plate 10 is moved via the rotating shaft 12 and the swinging arm 11 to a position where the inlet 9 is opened, as shown by the imaginary line in FIG. The scum thus collected in front of the outside portion 3b of the scum schema 3 is poured into the scum box 8 from the inlet 9.
When the scum keema 3 approaches the scum box 8, its scraping swing plate 7a is swung upwardly by the guide 19, and the scum keema 3 reaches the scum box 8.
Pass through the top edge. When the scum keema 3 passes through the scum box 8, the operating lever 14 is returned to its original position by the balance weight 16, and the inlet 9 is closed by the partition plate 10.

According to the submerged scum box opening/closing device of the present invention, a partition plate for opening and closing the inlet is attached to the swinging arm, and an operating lever that rotates in conjunction with the swinging arm is arranged in the movement path of the scum scraping arm. By providing this operating lever with a cam surface that engages with the scum scraping arm, when the scum scraping arm approaches the scum box, the inlet is opened and the scraped scum flows into the scum box. Moreover, since it consists of a swinging arm, an operating lever, and a partition plate, the structure is simple and there is no risk of failure, and the opening degree and operating timing of the partition plate can be easily changed by replacing the operating lever. Can be done.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall schematic plan view, Fig. 2 is a partially sectional front view of the main part, Fig. 3 is a view taken in the direction of - arrow in Fig. 2, and Fig. 4 is a partition. It is an explanatory diagram of the operation of the board. 3... Scum schema, 5... Scum scraping arm, 7... Scraping plate, 8... Scum box, 9... Inflow port, 10... Partition plate, 11... Swinging arm, 12... Rotating shaft , 14...operation lever, 1
5...Cam surface.

Claims (1)

[Scope of utility model registration request] A partition plate for opening and closing the inlet provided on one side wall of the scum box is attached to the swinging arm, and an operating lever that rotates in conjunction with the swinging arm is arranged in the movement path of the scum scraping arm, and the operating lever An opening/closing device for a submerged scum box, characterized in that a cam surface is provided with which a scum scraping arm that moves toward the scum box engages.