JP2685080B2 - Annular screen type foreign matter treatment device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a screen type foreign matter treatment apparatus provided in a waterway for treating wastewater.

[Prior Art] In the conventional screen type foreign matter treatment device, since the rake scraping blades for scooping up the foreign matters remaining on the screen are relatively densely arranged, Even if it was a solid material that could be easily crushed, it would have been scooped up by the rake and carried out if it had a size that did not pass through the slit.

However, when processing foreign substances scooped up by the rake (hereinafter referred to as “si residue”), it is possible that undesired foreign matter is contained in the residue in terms of hygiene of the processing operator and obstruction of post-processing. is there. In particular, if unsanitary filth is mixed in the residue, it seriously hinders the operation of the processing apparatus.

Although these foreign matters are generally soft and relatively easy to grind, if they are solids larger than the slits, they are often scooped up by a rake. After being scooped up by the rake and entering the transport device, it is difficult to remove it simply by washing it with water. There was a problem that it could not be removed.

[Problems to be Solved by the Invention] In the present invention, attention is paid to the fact that a foreign substance which is unfavorable for post-treatment and is relatively small and easy to pulverize is relatively small, and the foreign substance is left on the screen without being scratched up by a rake. West,
It is an object of the present invention to provide a screen type foreign matter treatment device that can pass through together with a treatment fluid by natural disintegration.

[Means for Solving the Problems] In order to achieve the above object, in the screen-type contaminant treatment device of the present invention, in order to remove contaminants from the fluid, contaminants in the fluid are removed by a plurality of slits. An annular screen that is allowed to remain on the inner peripheral surface, a scraping device for scraping up contaminants remaining on the inner peripheral surface of the annular screen, and a contaminant scraped by the scraping device from the scraping device. A scraper device provided above the annular screen for dropping, and an annular screen type foreign matter treatment device comprising a conveying device for carrying out the scraped foreign substances, wherein the scraping device scrapes each slit. A rake in which the raising blades are arranged, and the scraping blades that are adjacent to each other in the lateral direction with respect to the scraping direction of the scraping blades are arranged every other slit or at two or more slits. I have.

In addition, a water discharge device that discharges water for cleaning foreign matters may be provided in the transport device.

Further, in the above-mentioned screen type foreign matter treatment device, a water discharge device for discharging water to the scraping device can be provided while the scraping device scrapes up the foreign substances.

[Operation] In the foreign matter treatment device having the screen configured as described above, even if foreign matter that is unfavorable to processing and is relatively easy to pulverize is caught on the upstream surface of the screen as foreign matter, the foreign matter is scratched. Since it passes relatively between the raising blades, it cannot be picked up by the scraping device. Thus, the foreign matter remains on the screen, spontaneously collapses due to the flow or vibration of the fluid, and passes through the slit of the screen together with the fluid. Further, since the contaminants scraped off by the rake do not contain foreign matter which is unfavorable to the treatment, the post-treatment of the scraped contaminants, that is, the screen residue becomes easy.

[Example] An example will be described with reference to the drawings. Fig. 1 shows a screen type contaminant treatment device for removing contaminants from a fluid such as wastewater flowing in a water channel in a direction of an arrow A. Has been done.

In the screen type foreign matter treatment device of the present embodiment, a cylinder jacket-like screen 10 is partly submerged in water and arranged in an inclined manner. In this embodiment, the screen 10 is
It is composed of a large number of plate-shaped members 10b, that is, an annular plate, which are statically arranged so as to form an annular slit 10a.
When the fluid passes through the slit, the impurities are left on the upstream surface or the inner peripheral surface of the annular plate.

A rotary scraping device 12 is provided in the screen 10, and the rake 14 at the tip of the scraping device 12 is used to screen the screen 10.
It is possible to scrape up the impurities remaining on the upstream surface of the. As shown in FIGS. 2 and 3, the rake 14 has staggering blades 16 arranged in a staggered manner.

The scraping blade 16 is configured such that the tip thereof enters the slit 10a of the screen 10 and moves in the direction of the arrow B to scrape up impurities on the screen 10.

In the conventional technique, the scraping blades 16 that enter the slits are arranged in a line in the direction of movement of the arrow B. For this reason, the interval between the adjacent scraping blades 16 is narrow, and even relatively small impurities are scraped up.

However, as described above, the relatively small impurities include foreign matter that is not preferable for post-processing, and if the spacing between the scraping blades 16 is narrow, this foreign matter will be mixed in the residue. .

On the other hand, since a normal contaminant is longer than the width of the slit, it is not necessary for the adjacent scraping blades 16 to be lined up in order to scrape one contaminant. For example, as shown in FIG.
If a and 16b are lined up, the scraping blades 16a and 16b are used to remove foreign matter p.
You can scrape up.

On the other hand, if the scraping blade 16 is not arranged for each slit,
There is a risk that the gap between the scraping blades 16 becomes large, and that impurities that cannot be scraped up by the scraping blades 16 may come out.

Therefore, if the scraping blades 16 are arranged alternately,
The purpose of scraping up foreign matters can be achieved, and relatively small foreign matter relatively passes through the gap between the scraping blades 16 and cannot be scraped up by the scraping blades 16.
It remains on top.

Thus, the foreign matter remaining on the screen 10 is relatively easy to collapse, so it naturally collapses with the passage of time due to the flow of the fluid, the vibration caused by the operation of the rake 14, etc., and enters the slit to flow with the fluid. Leave.

With the above configuration, most of the foreign matter is on the screen 10.
It remains above and eventually runs off with the fluid. But,
Some foreign substances may adhere to other contaminants and get mixed into the residue. On the other hand, in this embodiment, a cleaning device is provided. This cleaning device will be described below with reference to a scraping and scraping device and a transport device.

Further, in the present embodiment, the upper portion of the screen 10 has an opening formed by the cutout portion of the annular plate, and there is the scraper device 22 therein, and when the rake 14 comes to the upper portion of the screen 10, It is designed to scrape off the residue on the rake 14 (contaminants pulled up from the fluid).

Then, the carrier device 18 extends from the inside of the screen 10 to the dumping position 18a for the purpose of the residue treatment. This transfer device 18 has a screw conveyor 20 for transferring the residue from the screen 10 to the dumping position 18a and compressing and dehydrating it. The residue thus compressed and dehydrated is stored in a container (not shown) or the like from the dumping position 18a and post-processed. On the other hand, the fluid generated by the dehydration flows downward through the transport device 18 and is returned to the water channel.

The transfer device 18 has a hopper 24 at the lower end thereof, and the hopper 24 is configured to receive the scraps scraped off by the scraper device 22 under the scraper device 22.

The scraper device 22 is provided with a water discharge device 22a, and by discharging water onto the rising rake 14, the residue on the rake 14 is dropped into the hopper 24, and at the same time, the residue is washed to remove the residue. Foreign substances adhering to the can be washed off. Thus, the residue is carried out from the inside of the screen 10 as described above while being cleaned by the screw conveyor 20 extending in the hopper 24.

In contrast to the provision of the water discharge device 22a, in the present embodiment,
A transport device (18) for carrying out contaminants from the screen (10) is water permeable at least at the lower end. In other words, the hopper 24 has a screen shape or a mesh shape in the screen 10. As a result, the residue wash water from the water discharger 22a is dropped into the water channel. Specifically, the hopper 24 is formed by arranging a plurality of elongated plate-shaped members as shown in FIG. As a result, the water from the water discharger 22a flows down into the water channel without collecting in the hopper 24, so that the cleaning of the residue is enhanced when the screw conveyor 20 receives the residue from the rake 14.

Further, in the present embodiment, a water discharge device 26 is provided for discharging water to the rake 14 while the rake 14 of the scraping device 12 scrapes up foreign matters. The water discharge device 26 is a water discharge device.
Apart from 22a and hopper 24, this water drops directly into the waterway. In this way, even while the rake 14 is rising, the residue can be washed and foreign substances can be washed off.

In this way, the cleaning performed when the residue is on the rake 14 or when the residue is in the hopper 24 is extremely effective in cleaning foreign matters as described above. Because,
This is because if the residue is compressed as the screw conveyor 20 moves up, it becomes difficult to remove foreign matter by washing.

Although the annular screen has been described above, it goes without saying that the present invention can also be applied to a flat bar screen. Further, in the above-mentioned embodiment, every two scraping blades are arranged in the lateral direction, but every other scraping blade may be arranged in the lateral direction, or all the scraping blades are not arranged in the lateral direction. You may make it deviate little by little. further,
In the above-mentioned embodiment, the hopper of the transfer device for carrying out the contaminants from the screen was formed in a screen shape or a mesh shape, but the hopper only needs to be water permeable at least in the lower part, and a normal hopper is used for that. A drain hole may be formed in the lower portion. Alternatively, the hopper may be formed of a punch metal member. Thus, modifications can be made without departing from the scope of the invention.

[Effects of the Invention] When wastewater is treated by the foreign matter treatment device having the screen configured as described above, soft foreign matter, which is not preferable in post-treatment, remains on the screen and is scraped up by the rake into the residue. Not included. In addition, this foreign substance naturally disintegrates, passes through the screen together with the fluid by washing with water, and is treated together with the fluid.

Therefore, the scraped foreign matter, that is, the post-treatment of the screen residue is facilitated and the unsanitary soft foreign matter is removed, so that the screen residue processing is not hindered.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of the entire screen type foreign matter treatment apparatus according to an embodiment of the present invention. FIG. 2 is a partially cutaway plan view showing the arrangement of the rake scraping blades in the screen according to the embodiment of the present invention together with impurities. FIG. 3 is a perspective view showing a rake according to an embodiment of the present invention. FIG. 4 is a perspective view showing a hopper of the screen type foreign matter treatment apparatus according to the embodiment of the present invention. 10 …… screen, 12 …… scraping device, 14 …… rake,
16 …… Scraping blade, 18 …… Conveyor, 20 …… Screw conveyor, 22a, 26 …… Water discharger, 24 …… Hopper, 26…
... water discharge device,

Claims (2)

(57) [Claims] 1. An annular screen in which a plurality of slits are provided so that the impurities in the fluid remain on the inner peripheral surface in order to remove the impurities from the fluid, and the impurities remaining on the inner peripheral surface of the annular screen. A scraping device for scraping up, a scraper device provided above the annular screen for scraping off the contaminants scraped by the scraping device from the scraping device, and carrying out the scraped contaminants. In the annular screen type foreign matter treatment device comprising a carrying device, the scraping device has a rake in which a scraping blade is arranged for each slit, and is lateral to the scraping direction of the scraping blade. An annular screen type foreign matter treatment device, wherein adjacent scraping blades are arranged every other slit or at two or more slits. 2. The annular screen type foreign matter treatment apparatus according to claim 1, further comprising a water discharger for discharging water for washing the foreign matter in the transfer device.