JP3239019B2 - Screen movable dust remover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless screen using perforated metal, net or the like in sewage treatment to efficiently remove even high-concentration impurities in sewage without increasing the head loss. The present invention relates to a screen-movable dust remover.

[0002]

2. Description of the Related Art Rainwater falling in urban areas and domestic wastewater are
After being collected at a sewage treatment plant via culverts, sewers, etc., after removing garbage etc. contained in the sewage, this sewage is directly or pumped up and sent to the next treatment tank for treatment, or if it is rainwater Next, they are released into the river. In general, a bar screen or the like is used to remove fine dust and the like in the sewage.

[0003]

However, when a bar screen-like screen is used for removing fine dust as in the prior art, the effective passage area of the screen decreases as the mesh width of the screen decreases, and the screen is generally used as in the case of rain. Large volumes of sewage would cause a large loss when treated, and film and string-like debris were more likely to come off the screen, making it difficult to reliably remove them. In addition, when inserting the teeth of a scraping rake between the narrow bar screens at the bottom of the bar screen, the rake teeth are too thin to easily deform even if small dust is bitten, making it impossible to insert, leading to failure, etc. There are drawbacks.

SUMMARY OF THE INVENTION It is an object of the present invention to perform dust removal while suppressing an increase in water loss head even when inflow of high-concentration contaminants, and efficiently and effectively removing contaminants adhering to a screen.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and has an endless screen stretched so as to be parallel to a water channel and to have a lower portion submerged below the water surface of the water channel. In a screen-movable dust remover in which the endless screen is driven to rotate and removes foreign matters caught by the screen, the endless screen is bent in a multi-stage manner and stretched. A stripping means is installed at the upper position inside the screen, removing scraping impurities at each stage of the endless screen. The gist is to remove.

[0006]

[Function] A screen in which holes such as punching metal, net, etc., which are rotationally driven in a water channel, or a filter material in the form of a vertical and horizontal lattice is formed in an endless form, and is stretched and arranged. When sewage flows from the inner surfaces of the respective U-shaped screen interiors A1 and A2 and flows out to the screen external water passage B or C, the screen residue in the sewage is opposed to the U-shaped screen interiors A1 and A2 of each stage. After being captured on both the inner surfaces of the descending side and the upper side of the screen, the rotation of the screen causes the captured screen residue to be lifted over the water channel via the upper side of the screen. Since the stripping means is disposed above the upper side of the inside of each U-shaped screen A1 and A2, respectively,
1. The screen residue scraped up in A2 is separated from the screen surface by the stripping means and falls into the screen residue collecting and discharging device 9 below. For this reason, even if the endless endless screen moves to the next U-shaped screen inside A2 via the U-shaped screen inside A1, the screen surface is always in a state where the screen residue is not attached.
Even when the high-concentration impurities are flowing in, dust is removed by suppressing the rise of the water loss head, and efficiently and effectively removing the impurities adhered to the screen.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a screen-movable dust remover according to the present invention. In FIG. 1, reference numeral 1 denotes a water channel, in which a screen movable dust remover 2 mainly comprising a screen made of a perforated metal having a required hole diameter and the number of holes or a net having a required interval is mainly provided. The screen-movable dust remover 2 rotatably supports a wheel 5 and a driven wheel 6 driven by a driving device 4 on a main body frame 3 installed on a water channel, and also rotates the wheels 5, 6, and the inside of the water channel. As shown in the figure, a screen 7 formed into an endless shape on two U-shaped guide rails 8 and 8 for guiding both sides of the endless screen is stretched in a two-fold W shape or a multi-stage folding type, and The lower part of the two-folded W-shaped or multi-stage bent endless screen 7 is stretched so as to reach almost near the bottom of the water channel 1, and a screen residue collecting and discharging device 9 is provided in the screen 7. It is provided.

The endless screen 7 has a required width corresponding to the capacity of the screen and a length (total length) corresponding to the depth of the water channel, etc., and has a flat flat plate having a large number of holes having a required diameter and a hole pitch. A perforated metal (for example, by setting the porosity of the punched metal to about 50 to 80% to efficiently remove dust) or a net having an appropriate mesh width through a frame or the like, on both sides thereof Is fixed to a chain arranged in the endless manner and is configured to be able to bend endlessly and smoothly.

The endless screen 7 is made of a flat plate having a smooth surface and holes having a diameter suitable for the screen arranged at a required pitch, for example, a punching metal or the like. To the endless chain.

[0010] Further, at a position above the water surface of the endless screen 7, the leaves attached to the screen and scooped up.
A stripping means 10 is provided for stripping and removing contaminants (screen residue) such as string-like dust from the screen surface. As shown in the figure, the peeling means 10 is located above the water surface above the U-shaped screens A1 and A2 of the endless screen 7 stretched in the water channel 1 in a two-fold W-shape. In addition, the cleaning nozzle 10N is disposed so that the cleaning water is sprayed at a required angle with respect to the screen surface.
It is peeled off by spraying N washing water, and falls into the screen residue collecting and discharging device 9.

Further, a rotating brush 10B can be employed as the stripping means. The rotating brush 10B is located at a position on the screen rear side above the water surface above the water surface on the final upper side inside the endless screen 7 which is stretched in a water channel 1 and folded in a W-shape in the same manner as the cleaning nozzle 10N. Arrange so that it contacts the surface. Further, a combination of the cleaning nozzle 10N and the rotating brush 10B may be used as the peeling means. In this case, the washing water sprayed from the washing nozzle or the dust entangled in the hole of the screen due to the rotation of the rotary brush is released by removing the entanglement force.

Accordingly, sewage water flows from the inner surfaces of the insides A1, A2 of the U-shaped screens of the endless screen 7, which is arranged in a two-fold W-shape or a multi-stage folding manner so as to be driven to rotate in the water channel 1, When the screen residue in the sewage is drained to the screen outside water channel B or C, the screen residue is trapped on both the lower side and the upper side facing the inside of each U-shaped screen A1, A2, and then the screen is rotated. , The trapped screen residue is scooped up above the water channel through the screen upper side. The cleaning nozzle 10 is placed on the back of the screen.
The dust adhering to the screen surface is removed from the screen surface by spraying the washing water at N or by the rotation of the brush, and the running water trough and the like installed in the upper part of the screen 7 at the lower position are collected. It is dropped into the discharge device 9 and discharged out of the water channel.

As described above, since the endless screen 7 is of a multi-stage folding type and the screen residue is removed by a peeling means at each stage, the first stage of the next stage U-shaped screen is also provided. As in the case of the inside of the U-shaped screen, the screen residue can be captured on the screen surface on which the screen residue does not adhere.

[0014] Compared to a system in which the endless screen is simply rotated in a loop, a system in which the screen is stretched in a two-fold W-shape has the advantage that the filtration area is doubled and the head loss is suppressed to about one fourth. However, even if the endless screen 7 is stretched in a two-fold W-shape, the screen is once submerged and the contaminants are captured, and then submerged again as it rises above the water surface. The filter body is clogged. That is, even if the contaminants trapped on the screen surface reach a state close to saturation inside the first stage screen and the screen enters the underwater portion of the second stage screen, the U-shaped second stage screen immediately And the water level rises rapidly. However, since the stripping means is provided for each stage as in the present invention, the inside of the U-shaped screen is not clogged or trapped on the screen surface for each stage. Is performed in the same manner. As a result, the screen can be prevented from rising even with high-concentration impurities without blocking the screen.

Further, in the embodiment shown in FIG. 6, the endless endless screen is a multi-stage of four stages, and in this case also, the stripping means is provided for each stage, so that the trapping of the foreign substances is not possible. This is performed efficiently as in the case of the first embodiment.

In the embodiment shown in FIG. 1, the collecting and discharging device 9 has one U-shaped or V-shaped trough 9 disposed in the width direction of the screen. , And A2, each of which drops the screen residue and conveys and discharges it directly or through a collecting trough to the outside of the water channel. As shown in FIG. 9 can be disposed and discharged independently. .

[0017]

The screen-movable dust remover according to the present invention is constructed such that an endless screen is stretched in a multi-stage folding manner, and peeling means is disposed at an upper position inside each of the U-shaped screens. Since the scraping impurities are removed at each stage, even if high-concentration impurities flow into the water channel, an increase in the loss head can be suppressed and efficient removal of the impurities can be performed. In addition, there is an advantage that the screen residue can be removed smoothly without clogging the screen even during long-time operation.

[Brief description of the drawings]

FIG. 1 is a front view of a screen-movable dust remover of the present invention.

FIG. 2 is a plan view of the screen unit.

FIG. 3 is a side view of the same.

FIG. 4 is a plan view showing the entire dust remover.

FIG. 5 is an explanatory view of another embodiment of the present invention.

FIG. 6 is an explanatory view of still another embodiment of the present invention.

FIG. 7 is an explanatory diagram comparing the amount of contaminants captured on a screen with a conventional example and the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water channel 2 Dust remover 5 Drive wheel 6 Follower wheel 7 Endless screen 8 Guide rail 9 Screen residue collection and discharge device 10N Cleaning nozzle 10B Rotary brush A1, A2 Inside of U-shaped screen B, C Screen external water channel

Continuation of the front page (72) Inventor Toshiaki Tsuda 3-1-1, Shimosakabe, Amagasaki-shi, Hyogo Pref. Inside the Hitachi Kiden Electric Industry Co., Ltd. (56) References JP-A-8-33812 (JP, A) Patent 283809 (JP) , B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 33/00 E02B 5/08

Claims (1)

(57) [Claims] 1. An endless screen is stretched and disposed so as to be parallel to a water channel and immersed below the water surface of the water channel, and the endless screen is driven to rotate to remove impurities trapped by the screen. In the screen movable type dust remover, the endless screen is bent in a multi-stage bending manner and stretched, and peeling means is disposed at an upper position inside each of the U-shaped screens. A screen-movable dust remover, which removes contaminants on the surface of a screen and efficiently removes contaminants by suppressing a rise in head loss even for high-concentration contaminants.