JPH032411A - Screen type impurities processing device - Google Patents

Abstract

PURPOSE:To facilitate the aftertreatment of waste water by providing a plurality of rake-up blades alternately arranged to a raker, and getting soft and comparatively smashable foreign matters passed through the rake-up blades relatively to be broken naturally. CONSTITUTION:A raker 12 raking up impurities remained on the upstream surface of a screen 10, a scraper device 22 scraping off the impurities on the raker 12 and a carrier device 18 carrying the impurities are provided. The raker 12 has a plurality of rake-up blades 16 and 16 alternately arranged there to, and soft and comparatively smashable foreign matters are passed through between the rake-up blades 16 and 16 relatively. The foreign matters remaining on the screen 10 are broken naturally by the flow of fluid, vibration, etc., and they are filtered through the screen 10 together with the fluid. According to the constitution, the foreign matters undesirable for the treatment can not be included into the impurities raked by a rake 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screen-type foreign matter treatment device installed in a waterway for treating wastewater.

[Prior Art] In conventional screen-type foreign matter processing equipment, the scraping blades of the rake that scoop up foreign matter remaining on the screen are arranged relatively densely, so Even if the solid material is easy to crush, if it is too large to pass through the slits, it is scooped up with a rake and transported out.

However, when disposing of foreign matter scooped up by a rake (hereinafter referred to as sludge), it is common for foreign matter to be contained in the sludge, which is undesirable from the viewpoint of hygiene for processing workers and interference with post-processing. be. In particular, when unhygienic filth gets mixed into the scum, it is inevitable that it will seriously impede the operation of the processing equipment.

Although these foreign substances are generally soft and relatively easy to crush, if they are solid and larger than the slit, they are often scooped up by a rake, and once they are scooped up by a rake, they are transferred to a conveying device. Once it has entered the water, it is difficult to remove it simply by washing with water, and especially after it has been removed while being dehydrated in a removal device, it cannot be removed even with pressure water.

[Problem M to be solved by the invention] The present invention focuses on the fact that soft foreign matter that is undesirable for post-processing and is relatively easy to crush is relatively small, and this foreign matter remains on the screen without being scraped up by a rake. The object of the present invention is to provide a screen-type contaminant treatment device that allows the contaminants to pass together with the treatment fluid by natural collapse.

[Measures for Solving the Problems Vi] 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 flowing in the waterway, a A screen that has slits extending on a downstream surface from which a fluid flows out, and allows contaminants in the fluid to remain on the upstream surface while the fluid passes through the slits and flows out; In a screen-type foreign matter processing device having a scraping device for scraping up, a scraper device provided above a screen to scrape off foreign matter on the scraping device, and a conveyance device for transporting foreign matter from the screen. , the scraping device has scraping blades arranged alternately.

Further, in the screen-type foreign matter processing device, a water discharge device may be provided to discharge water to the scraping device while the scraping device scrapes up foreign matter.

[Function] In a foreign matter processing device having a screen configured as described above, even if soft and relatively easily crushed foreign matter that is undesirable or undesirable for processing gets caught as foreign matter on the upstream surface of the screen, it will be relatively small. Therefore, since the foreign matter passes relatively between the scraping blades, it cannot be scraped up by the scraping device.Thus, the foreign matter remains on the screen and is naturally disintegrated by the fluid flow and vibration, and is removed from the screen together with the fluid. Pass through the slit. The foreign matter scraped off by the rake is
Since it does not contain foreign matter that is undesirable for processing, it becomes easy to post-process the scraped foreign matter, that is, the residue.

[Example] An example will be described with reference to the drawings. FIG. 1 shows a screen-type foreign matter treatment device for removing foreign matter from a fluid such as wastewater flowing in the direction of arrow A in a waterway. has been done.

The screen-type contaminant treatment apparatus of this embodiment is composed of an annular plate in which a cylinder jacket-like screen 10 is partially submerged in water and arranged at an angle. As the fluid passes through the slit, contaminants remain on the upstream surface of the annular plate.

A rotary scraping device 12 is provided inside the screen 10, and a rake 14 at the tip of the scraping device 12 can scrape up foreign matter remaining on the upstream surface of the screen 10. The rake 14 has raking blades 16 arranged alternately, as shown in FIGS. 2 and 3.

The scraping blade 16 is configured such that its tip enters a slit 10a of the screen 1°, moves in the direction of arrow B, and scrapes up foreign matter on the screen 10.

In the prior art, the scraping blades 16 that enter each slit are lined up horizontally in a row with respect to the moving direction of arrow B. For this reason, the spacing between adjacent scraping blades 16 is narrow, and even relatively small foreign matter can be scraped up.

However, as mentioned above, some relatively small contaminants are undesirable in terms of post-processing, and if the spacing between the blades 16 is narrow during scraping, these foreign substances will get mixed into the residue. be.

On the other hand, since normal foreign matter is longer than the width of the slit, it is not necessary for adjacent scraping blades 16 to be lined up in order to scrape up one foreign matter. , with two slits in between, scraping blade 1
If 6a and 16b are lined up, the scraping blades 16a and 16
You can scrape up the contamination 11ap with b.

On the other hand, if the scraping blade 16 is not arranged for each slit,
The gap between the scraping blades 16 becomes larger, and the scraping blades 1
There is a risk that foreign substances that cannot be scraped up in Step 6 may come out.

Therefore, if the scraping blades 16 are arranged alternately,
The purpose of scraping up foreign matter can be achieved, and relatively small foreign matter passes through the gap between the scraping blades 16 and remains on the screen 10 without being scraped up by the scraping blades 16. .

In this way, the foreign matter remaining on the screen 10 is relatively easy to streak, so over time it will naturally disintegrate due to the flow of the fluid or vibrations caused by the operation of the rake 14, and enter the slits together with the fluid. It flows away.

With the above configuration, most of the foreign substances are removed from the screen 10.
remains on top and eventually flows away with the fluid. but,
Some foreign substances may adhere to other impurities and become mixed into the residue. In contrast, in this embodiment, a cleaning device is provided.

This cleaning device will be described below in relation to the scum scraping and conveying device.

Furthermore, in this embodiment, there is a scraper device 22 on the top of the screen 10, and a rake 14 is installed on the top of the screen 10.
When the rake 14 reaches the upper part of the fluid, the scum (impurities pulled up from the fluid) on the rake 14 is scraped off.

A conveying device 18 extends from inside the screen 10 to a dumping position 18a for liquid treatment. This conveying device 18 includes a screw conveyor 20, which conveys the residue from the screen 10 to the dumping position 18a and compresses and dehydrates it. The dried residue thus compressed and dehydrated is stored in a container (not shown) or the like from the dumping position 18a for post-processing. On the other hand, the fluid generated by dehydration flows down the conveying device 18 and is returned to the water channel.

The conveyance device 18 has a hopper 24 at its lower end, and the hopper 24 is arranged under the scraper device 22.
It is designed to receive the residue scraped off by the scraper device 22.

The scraper device 22 is provided with a water spraying device 22a, which sprays water onto the rising rake 14 to drop the sludge on the rake 14 into the hopper 24 and at the same time wash the sludge and remove the sludge. Foreign matter attached to the can be washed away. In this way, the residue is washed by the screw conveyor 20 extending inside the hopper 24.
As described above, it is carried out from inside the screen 10.

In contrast to the provision of the water discharge device 22a, in this embodiment,
A conveying device 18 for removing contaminants from the screen 10 is permeable to water at least at its lower end. In other words, the hopper 24 is in the form of a screen or mesh within the screen 10. As a result, water cannon W
22 The residue washing water from a is dropped into the waterway. Specifically, the hopper 24 is formed by arranging a plurality of elongated plate-like members as shown in FIG.

As a result, the water from the water discharge device W 22a or the hopper 2
Because it will flow down into the waterway without collecting in the water,
Cleaning of the residue is enhanced when the screw conveyor 20 receives the residue from the rake 14.

Further, in this embodiment, a water spraying device 26 is provided that discharges water to the rake 14 while the rake 14 of the scraping device 12 scrapes up impurities. The water discharge device 26 is
Separated from the water discharge device 22a and hopper 24, this water falls directly into the water channel. In this way, even while the rake 14 is rising, the residue can be washed and foreign matter can be washed away.

Cleaning performed when the residue is on the rake 14 or in the hopper 24 is extremely effective in cleaning foreign matter as described above. This is because if the scum becomes compressed as it moves up the screw conveyor 20, it becomes difficult to remove foreign substances 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.Also, in the embodiment described above, every second scraping blade was aligned in the horizontal direction. , every other scraping blade may be aligned in the horizontal direction, or all the scraping blades may be aligned in the horizontal direction and may be slightly shifted. Although the hopper of the conveying device is formed in the form of a screen or mesh, the hopper only needs to be water permeable at least in the lower part, and it is also possible to use a normal hopper and form a drain hole in the lower part. Alternatively, the hopper may be formed of a punched metal member.

Modifications can thus be made without departing from the scope of the invention.

[Effect of the invention] When wastewater is treated with a contaminant treatment device having a screen configured as described above, soft foreign matter that is undesirable for post-treatment remains on the screen, is scraped up by a rake, and is absorbed into the residue. Also, this foreign matter is naturally disintegrated, passes through the screen together with the fluid by washing with water, and is disposed of together with the fluid.

Therefore, post-processing of the scraped impurities, ie, human scum, is facilitated, and unhygienic soft foreign objects are removed, so that they do not interfere with the human sap treatment.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the entire screen-type foreign matter processing apparatus according to an embodiment of the present invention. FIG. 2 is a partially cutaway plan view showing the arrangement of the scraping blade of the rake according to the embodiment of the present invention in the screen together with foreign matter. 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 a screen type foreign matter processing apparatus according to an embodiment of the present invention. (Margins below this page) 10 ・ ・ 12 ・ 14 ・ ・ 16 ・ 18 ・ ・ 20 ・ 22a. 24 ・ ・ 26 ・ ・ Screen, scraping device, rake scraping blade, conveyance device, screw conveyor, 6... water spray device, hopper water spray device,

Claims (2)

[Claims] (1) In order to remove impurities from the fluid, a slit is formed that extends from the upstream surface where the fluid flows in to the downstream surface where the fluid flows out, and as the fluid passes through the slit and flows out, the impurities in the fluid are removed. A screen configured to remain on an upstream surface, a scraping device for scraping up foreign matter remaining on the upstream surface of the screen, and a scraper device provided above the screen for scraping off foreign matter on the scraping device. , a screen-type foreign matter processing apparatus having a conveying device for transporting foreign matter from the screen, wherein the scraping device has scraping blades arranged alternately. Device. (2) The screen-type contaminant treatment device according to claim 1, further comprising a water discharge device for discharging water to the scraping device while the scraping device scrapes up the contaminants.