JPS6326238Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a scum removal device.

A large amount of scum is generated in sewage treatment tanks such as various settling basins and sludge treatment tanks, and a phenomenon is observed in which this scum floats on the surface of the tank liquid. This scum is a combination of bacteria, undigested organic particles, inorganic particles, etc. in the wastewater.
This contains air, water, gas, etc., which makes the specific gravity lighter and floats to the surface of the liquid. Leaving this scum as it is will cause a bad odor,
In addition, individual floating lumps aggregate and combine to form hardened floating lumps, which poses various problems in sewage treatment.

Conventionally, various methods and mechanisms have been employed to remove the above-mentioned scum, and FIG. 1 shows an example thereof. In the figure, reference numeral 1 is a sewage treatment tank, 2 is a rake, and 3 is a rotating shaft for supporting the rake 2 and rotating it horizontally along the bottom of the tank. A scum scraping member 4 that can go around is installed. The scum scraping member 4 is formed from a plate-shaped skimmer 5 and a scraper 6 at the tip of the circumference, and the skimmer 5 moves the floating scum in a radial outward direction while circulating horizontally on the liquid surface by the rotating shaft 3. A large amount of scum is scraped up and guided by a tip scraper 6 and dropped into a collection box 7 installed inside the tank, and a discharge pipe 8 communicates between the box 7 and the outside of the tank.
It is designed to be discharged to the outside. However, the discharge operation is not mandatory, and since the scum is in the form of lumps, the flow is poor, and the scum accumulates in the box 7 and the discharge pipe 8, resulting in a phenomenon that complete discharge and removal cannot be performed.

In view of the above-mentioned scum discharge work, the present invention provides a scum removal device that allows liquid in a tank to flow into a collection box while scraping and accumulating scum, and allows the scum to be smoothly discharged by this liquid flow. With the goal.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 2, the sewage treatment tank A has a rotating shaft 11 that rotates the rake 10 horizontally along the bottom surface of the tank.
Similar to the prior art described above, a scraping member 14 consisting of a skimmer 12 and a scraper 13 is installed so as to be able to circulate along the liquid surface. The present invention is characterized in that a liquid inflow valve 16 is provided on the side surface of the accumulation box 15 below the circulation of the scraping member 14.

As shown in FIGS. 3 to 5, this liquid inflow valve 16 has one end of an inflow pipe 17 formed in a substantially U-shape connected and fixed to the side surface of the collection box 15 so as to be able to communicate with the other end of the inflow pipe 17. A lid 19 is axially connected to the inlet 18 formed at the end and located upward below the liquid level so as to be openable and closable, and the lid 19 is provided with an opening/closing bar 20 along the circumferential direction of the scraping member 14. . The opening/closing bar 20 has its middle side fixed on the lid 19, and extends from the tip side protruding from the part fixed to the lid 19, that is, along the circumferential direction of the scraping member 14, from the accumulation box 15 to the front of passage. It has a shape in which the extended elongated part is curved upward in a circular shape,
Further, a weight 21 is connected to the rear end protruding from the portion fixed to the lid 19.

The connecting shaft 22 between the inlet port 18 of the inflow pipe 17 and the lid body 19 is located on the circularly curved side of the opening/closing bar 20 . Therefore, in the normal state, the lid body 19 tightly closes the inlet 18 by the weight of the weight 21 provided at the rear end of the opening/closing bar 20, and at this time, the opening/closing bar 20
The circular curved portion is located above the lower circumferential surface of the skimmer 12. On the other hand, the accumulation box 15 is
It is located on the lower surface of the scraping member 14 in the circumferential direction.

The present invention has the above-mentioned configuration, and the state of use will be explained next.

The scraping member 14 revolves around the liquid surface by the rotating shaft 11, and the skimmer 12 scrapes the scum to the scraper 1.
When the skimmer 12 scrapes the waste to the third side and drops it into the collection box 15, passes over the collection box 15 and goes around it further, the skimmer 12 hits the circular curved part of the opening/closing bar 20 located above the lower surface of the skimmer 12 around which it goes. come into contact with As the skimmer 12 moves forward, the circular curved portion of the opening/closing bar 20 is pushed down, so that the lid body 19 resists the weight of the weight 21 and opens on the rear side around the connecting shaft 22 with the inflow pipe 17. The liquid in the tank flowing from the inflow port 18 flows into the collection box 15 through the inflow pipe 17, and the accumulated scum is washed away by the inflowing liquid and is discharged to the outside of the tank.

When the skimmer 12 moves further forward and comes off the opening/closing bar 20, the opening/closing bar 20 returns to its normal state due to the weight of the weight 21, and the lid 19 closes the inlet 18.

In the above description, the case where the opening/closing bar 20 is opened/closing by contacting with the skimmer 12 has been explained, but the opening/closing bar 20 is not limited to this. Actuating member 2 below skimmer 12 in position
3 is suspended, and the operating member 23 opens and closes the opening/closing bar 2.
0 may be activated. Further, the dropping of scum into the collection box 15 by the scraper 13 and the inflow of liquid from the inflow pipe 17 may be performed simultaneously.

According to the present invention described above, a large amount of scum accumulated in the accumulation box 15 can be easily discharged to the outside by liquid inflow. The scum will not become clogged and the scum can be discharged continuously. Moreover, since the liquid is made to flow out only when discharging the scum, the liquid in the tank is not wasted.

Furthermore, since the opening/closing operation of the inlet port 18 formed in the inflow pipe 17 by the cover body 19 can be performed by the vertical movement of the opening/closing bar 20 as the scraping member 14 goes around, the accumulation of scum and the box 15 are prevented.
The inflow of liquid into the interior can be performed in conjunction with each other.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing an example of a conventional sewage treatment tank, Fig. 2 is a schematic sectional view showing an embodiment of the sewage treatment tank of the present invention, Fig. 3 is a plan view of the liquid inlet valve, and Fig. 4
The figure is a front view of the same, and FIG. 5 is an enlarged sectional view of the main part. 10 is a rake, 11 is a rotating shaft, 14 is a scraping member, 15 is a collection box, 16 is an inflow valve, 17
18 is an inflow pipe, 18 is an inlet, 19 is a lid, 20 is an opening/closing bar, and 21 is a weight.

Claims (1)

[Scope of utility model registration request] In a processing tank A in which scum floating in the tank is collected in a box 15 by a scraping member 14 such as a skimmer 12 and a scraper 13 which are rotated by a rake rotation shaft 11, one end can be communicated with the collection box 15. A lid body 19 connected to the shaft is arranged so as to be openable and closable to an upward inflow port 18 provided at the other end of the inflow pipe 17 connected to The tip side of the opening/closing bar 20, that is, the portion extending forward from the collection box 15 along the circumferential direction of the scraping member 14 is formed into an upward circular curve, and a weight 21 is provided at the rear end of the opening/closing bar 20. , in the normal state, the circular curved part of the opening/closing bar 20 is connected to the skimmer 1
The liquid inlet valve 16 is positioned above the lower surface of the circulation of the scraping member 14, and the connecting shaft 22 between the inlet 18 and the lid body 19 is on the circularly curved side of the opening/closing bar 20. 1. A scum removal device characterized in that it is provided on a side surface of 15.