Scum removal apparatus

Liquid purification or separation – Gravitational separator – Mechanical constituent mover

Patent

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Details

210526, B01D 2118

Patent

active

053955269

DESCRIPTION:

BRIEF SUMMARY
FIELD OF TECHNOLOGY

The present invention generally relates to a scum removal apparatus for efficiently removing scum floating in a treatment pool and, more particularly, to the scum removal apparatus for collecting and removing the scum with the use of a power delivered by moving elements existing in the treatment pool and without using dedicated power.


BACKGROUND ART

Since a large amount of scum gathers on a water surface in a starting or final settling pool, it is necessary to remove the scum efficiently. In order to remove the scum, the applicant has suggested the following scum removal apparatus.
FIGS. 26 and 27 illustrate the scum removal apparatus S the applicant has previously suggested. In a rectangular settling pool provided with this scum removal apparatus, there is provided a plurality of (for example, four) sprocket shafts 200 having their longitudinal axes oriented across the width of the pool, a pair of sprocket wheels 201 mounted on each of the sprocket shafts 200, and left-hand and right-hand endless chains trained around the respective sprocket wheels 201 of each pair.
The scum removal apparatus is so designed as to be driven by the utilization of some or all of flights 203 secured to the endless chains 202 for drawing and removing the scum (floating matter).
The scum removal apparatus is provided with a trough 205, a guide support sheet 206, a weir 208 and a transmission mechanism 209. The trough 205 is of a generally U-shaped cross-section, top side and a front side of which are opened, and is fixed in position within the pool with its longitudinal direction oriented across the width of the pool.
The guide support sheet 206 is in the form of a generally elongated band of a length corresponding to the length of the trough 205 and is made of rubber material. This guide support sheet 206 is secured to the front side of the trough 205 so as to protrude outwardly therefrom and is capable of bending up and down by the effect of its elastic deformation. The weir 208 is of a generally triangular-sectioned hollow body which may often have a foaming material filled therein. This weir 208 is secured to a front side of the elastically deformable guide support sheet 206 so as to protrude outwardly therefrom and is capable of moving up and down on respective sides of a water surface 207 while being supported by the sheet 206.
The up and down movement of the weir 208 is effected by an actuating mechanism 209.
The actuating mechanism 209 comprises a rotary shaft 210 and a drive arm 211. The rotary shaft 210 extends over the width of the pool while the drive arm 211 is a single arm extending from one end of the rotary shaft 210 in a direction perpendicular thereto. A free end of the drive arm 211 is provided with a cam plate 213 having a cam surface defined at bottom thereof. The cam surface has two cam projections 213a and 213c and a recess 213b delimited between the cam projections 213a and 213c, all defined on the cam surface. Rollers 214 protruding from one end of the flights 203 (movable members) are used to move the cam plate 213 to drive the drive arm 211 and an operating arm 212 so that the weir 208 can be driven up and down through a rod 224 and an operatively associated arm 225. Each of the rollers 214 is secured to a bracket connected to one end of each flight 203 adjacent the earn plate 213.
The operating arm 212 cooperates with the rod 224 and the operatively associated arm 225 to form the transmission mechanism and extends in a direction towards the trough 205, which is counter to the direction of extension of the drive arm 211. This operating arm 212 is employed on each of the left-hand and right-hand sides of the pool.
The above described scum removal apparatus operates in the following manner.
When a motor not shown but installed outside adjacent to the pool is powered, the chains 202 are driven in a direction indicated by an arrow, accompanied by a low-speed circulatory movement of the flights 203 which are disposed on an outer circumference of the chains 202 in a circumferentially

REFERENCES:
patent: 4011164 (1977-03-01), McGivern
patent: 4462909 (1984-07-01), Kennel
patent: 4728440 (1988-03-01), van Kuijeren
patent: 5057219 (1991-10-01), Fujiwara
patent: 5200079 (1993-04-01), Schwartz et al.
Translation of Japan 58-100406.
Translation of Japan 3-54794.

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