JP2513464Y2 - Dust remover - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing device, and more particularly to a dust removing device for separating and collecting scum and impurities in sewage at a sewage treatment plant by a dust screen.

[0002]

2. Description of the Related Art A sewage treatment plant is provided with a dust removing device for separating scum and impurities generated in a sand basin of a sewage treatment facility. As shown in FIG. 2, this dust removing device is provided with a dust removing screen 10 arranged and attached to the cross section of the flow path 14 of the dirty water 12, and is installed at a predetermined angle in the flowing direction of the dirty water 12 (the arrow direction in the figure). It The lower portion of the dust removing screen 10 is provided on the bottom surface 16 of the flow passage 14, and the upper portion of the dust removing screen 10 is attached to a frame 20 installed on a support 18 of the flow passage 14.

A rake 22 is provided on the surface of the dust removing screen 10 on the dirty water side, and the rake 22 is connected to a pulley 26 via a wire rope 24. The pulley 2
6 is rotatably attached to the frame 20, and is connected so that the rotational driving force of a drive motor 28 attached to the upper portion of the frame 20 is transmitted.
As a result, the rake 22 causes the drive motor 28 to
By transmitting the driving force of the above to the pulley 26, it is possible to move up and down with respect to the surface of the dust removing screen 10.

Therefore, the scum 30 floating in the dirty water 12
Adheres to the surface of the dust removal screen 10 as the dirty water 12 flows. The scum 30 attached to the dust removing screen 10 is scraped up and discharged to the outside of the water channel 14 as the rake 22 located below the dust removing screen 10 moves upward through the cable 24. Not sent to the belt conveyor. The wastewater 12 from which the scum 30 has been separated and collected passes through the dust removal screen 10 and becomes the separated liquid 32, which is sent to the next treatment step.

[0005]

However, in the control of the vertical movement of the rake 22 of the dust removing device shown in FIG. 3, when the lower part of the rake 22 contacts the bottom surface 16 of the flow path, the rake 2 is removed.
2 is controlled to rise. Therefore, when the depth of the flow path is deep or when there are many scums 30 attached to the dust removal screen 10, the scraping ability of the rake 22 is insufficient, and the scums 30 cannot be efficiently removed. There is.

As a result of such a problem, the water level on the upstream side of the dust removal screen 10 rises above the water level on the downstream side (H in the figure). When the water level difference H increases, the operation of the pump on the downstream side of the dust removal screen 10 may be intermittently operated, which causes a defect in the next treatment process. The present invention has been made in view of such circumstances, and an object thereof is to provide a dust removing device capable of continuously operating a pump by eliminating the difference in water level between the upstream side and the downstream side of the dust removing screen. To do.

[0007]

In order to achieve the above-mentioned object, the present invention provides a dust removing screen which is disposed in a cross section of a wastewater flow passage and separates and collects scum and impurities in the wastewater from the wastewater.
Scraping means that moves along the dust removal screen and scrapes up scum and contaminants adhering to the dust removal screen to remove it from the dust removal screen, drive means that moves the scraping means up and down, and sewage upstream of the dust removal screen. And a control means for controlling the descending position of the scraping means by the driving means based on a water level detection signal from the water level measuring equipment.

[0008]

According to the present invention, the amount of vertical movement of the scraping means is controlled by controlling the drive means by the control means.
That is, when performing the first scraping, the descending movement amount of the scraping means is reduced, and at the time of the next scraping, the predetermined moving amount is lowered deeper than the initial moving amount to perform the scraping. . In this way, the movement amount of the scraping means by scraping is lengthened according to the number of times of scraping, and scum and contaminants adhering to the dust removing screen are gradually removed from the upper part of the dust removing screen in the downward direction. Thereby, the scum and impurities can be removed efficiently.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the dust removing device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of the dust removing device according to the present invention, and the same or similar members as those in the conventional example shown in FIG. In FIG. 1, the dust-removing screen 10 is arranged in the entire cross section of the flow path 14 of the dirty water 12, and the lower end portion thereof is arranged on the bottom surface 16 of the flow path 14. Further, the upper end portion of the dust removing screen 10 is fixedly installed on a frame 20 installed on the support base 18 of the flow path 14. Furthermore, the dust removal screen 10 is attached at a predetermined angle with respect to the direction in which the dirty water 12 flows (the direction of the arrow in the figure).
Therefore, the scum 30 and the foreign matters 31 floating in the sewage 12 are removed by the dust screen 1 as the sewage 12 flows.
Attach to 0. As a result, the scum 30 and the contaminants 31 in the wastewater 12 are removed from the wastewater 12, and the wastewater 12 passes through the dust removal screen 10 to become the separated liquid 32 and is sent to the next treatment step.

A rake 22 having an L-shaped cross section is provided on the left surface of the dust removing screen 10 in the figure. The rake 22 is attached to a rotary pulley 26 via a wire rope 24. The rotary pulley 26 is rotatably attached to the frame 20, and is connected so that a driving force of a drive motor 28 installed on the frame 20 is transmitted. Therefore, the drive motor 28
Is started to rotate the rotary pulley 26 in the direction of the arrow in the figure, thereby moving the rake 22 to the wire rope 2
4 can be moved up and down in the direction of the arrow in the figure, that is, along the surface of the dust removing screen 10. Therefore, the scum 30 and the foreign matter 31 attached to the dust removal screen 10 are scraped up and discharged to the outside of the water channel 14 by the rake 22 moving up and down as described above, and sent to a belt conveyor (not shown). .

On the other hand, the water level measuring device 34 is the dust removing screen 1.
It is attached to the upstream side of 0. The water level measuring instrument 34 is connected to a control device 38 via a cable 36 shown by a dotted line in the figure. The control device 38 controls the rotation speed and the rotation direction of the drive motor 28 based on the information when the information indicating the water level of the dirty water 12 measured by the water level measuring device 34 is input via the cable 36. The signal is output to the drive motor 28.

Next, a control method of the control device 38 will be described. First, when the water level of the wastewater 12 is measured by the water level measuring device 34, information on the measured water level is input to the control device 38 via the cable 36. The control device 38
When the first information is input, sends a signal to the drive motor 28 to move the rake 22 1 m below the surface of the dirty water 12 based on the information. As a result, the drive motor 28 rotates the rotary pulley 26 so as to immerse the rake 22 1 m below the water surface, and sends the rake 22 through the wire rope 24.

Next, when the rake 22 is located at a predetermined position, the drive motor 28 is rotated in the opposite direction, and the rake 22 is scraped up via the wire rope 24. As a result, the scum 30 and the contaminants 31 attached to the upper portion of the dust removal screen 10, that is, 1 m below the water surface can be removed. Next, the rake 22 is moved 2 m below the surface of the dirty water 12 and a signal is transmitted to the drive motor 28. As a result, the rake 22 is 2 above the surface of the water.
Immersion to a position below m, and when it is located at this position, the drive motor 28 is rotated in the opposite direction to scrape up the rake 22 and scum 30 and foreign matter 31 attached 2 m below the water surface of the dust removing screen 10 are removed. Remove. In this way, the raking amount of the rake 22 is made longer in accordance with the number of times of raking, so that the scum 30 and the contaminants 31 adhering to the dust removing screen 10 can be efficiently removed.

Therefore, according to the dust remover of this embodiment, as compared with the conventional dust remover in which the scumming efficiency is lowered because the scum 30 is scraped up at once from the bottom of the dust removing screen 10, Since the scum 30 and the contaminants 31 can be removed efficiently, it is possible to eliminate the difference between the water level on the upstream side and the water level on the downstream side of the dust screen 10.

Therefore, since the pump provided on the downstream side of the separated liquid 32 can be continuously operated, the adverse effect of the separated liquid 32 on the subsequent treatment step can be prevented.

[0016]

As described above, according to the dust removing apparatus of the present invention, the moving amount of the scraping means during scraping is made to increase sequentially according to the number of times of scraping based on the information from the water level measuring device. Therefore, the difference in water level between the upstream side and the downstream side of the dust removal screen can be eliminated, and the pump can be continuously operated, so that the adverse effect on the next treatment step can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a dust removing device according to the present invention.

FIG. 2 is an explanatory view showing an embodiment of a conventional dust removing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Dust removal screen 12 ... Sewage 14 ... Flow path 16 ... Bottom surface 20 ... Frame 22 ... Rake 28 ... Drive motor 34 ... Water level measuring instrument 38 ... Control device.

Claims (1)

(57) [Scope of utility model registration request] 1. A dust removal screen which is disposed in a cross section of the wastewater and separates and collects scum and impurities in the wastewater from the wastewater, and scum and foreign matter that moves along the dust removal screen and adheres to the dust removal screen. Scraping means for scraping up and removing from the dust removal screen, drive means for moving the scraping means up and down, water level measuring device for measuring the water level of the sewage upstream of the dust removing screen, and water level detection from the water level measuring device A dust removing device comprising: a control unit that controls the descending position of the scraping unit by the driving unit based on a signal.