JPH0435704A - Screening removing device - Google Patents

Abstract

PURPOSE:To reduce the clogging of a drum screen even after a long use by scraping off the foreign matter infiltrated into the slit of the screen with a screenings scraping claw fixed to the top of the screw blade at all times. CONSTITUTION:A screw blade 10 is freely rotatably arranged in a drum screen 8 having an opening opened toward the flow of a fluid to be treated. The screen 8 is formed with many circular plate members 22 equally spaced in its axial direction. The outer diameter of the blade 10 is made slightly smaller than the inner diameter of the member 22, and a screenings scraping claw 36 is fixed to the top of the blade 10 and moved in a slit 26 between the members 22. Consequently, the screen is hardly clogged even after being used for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a drum screen type sludge removing device, and more particularly to a drum screen type sludge removing device that prevents clogging of the drum screen.

[Prior Art] As one of conventional sludge removing devices having a drum screen, there is a drum screen type sludge removing device. When this device is placed in a waterway for water to be treated, the water to be treated enters through the circular opening and passes through the slits in the screen. At this time, the foreign matter gets stuck on the upstream surface of the screen, so the foreign matter is constantly removed by a foreign matter scraping device and carried out from inside the screen by a conveying device, thereby removing dust from the water to be treated. be exposed.

[Problems to be Solved by the Invention] However, when such a device is used for a long time, fine foreign matter in the fluid adheres to the slits of the drum screen, which tends to cause the screen to become clogged. It had to be pulled out of the tank and the foreign matter that was causing the clogging had to be manually removed.

[Object of the Invention] Accordingly, the object of the present invention is to provide a sludge removal device that can be used for a long time without clogging the screen by periodically removing fine impurities adhering to the slits of the drum screen. It's about doing.

[Means for Solving the Problems] The present invention has a drum screen having an opening that opens toward the flow of the fluid to be treated, and a screw blade rotatably disposed within the drum screen. A sludge removal device for removing sludge, wherein the drum screen consists of a number of annular plate members spaced apart in the axial direction, and the screw blade has an outer diameter slightly smaller than the inner diameter of the annular plate members. and on the top of the screw blade,
It is characterized by being equipped with a residue scraping claw that moves within the slit between the annular plate members of the drum screen.

[Function] In the residue removing device configured as above, the residue contained in the water to be treated is captured on the screen by the drum screen, and the water from which the residue has been removed passes through the slits of the screen. is discharged. The captured residue is gradually discharged by the screw blades. At the same time, the residue deposited between the slits is scraped off by the scraping claws moving within the slits.

[Example] Examples will be described below with reference to the drawings.

Referring to FIG. 1, an embodiment of a scum removing apparatus according to the present invention is schematically shown. An inflow pipe 4 for introducing water to be treated and an outflow pipe 6 for discharging treated water are connected to the sealed housing 2, and inside the housing 2 is a drum screen 8 which will be described in detail later, and this drum screen. 8
A screw vane 10 is provided which rotates within. The housing 2 includes a conveying device (screw conveyor) 12.
A pipe 14 forming part of the pipe 1 is connected to the
4, an extension of the screen blade 10 is rotatably housed. This conveyance device 12 extends to a position where sludge (contaminants removed from the water to be treated) is dumped. The transport device 12 is located near the @ section of the transport device 12.
A compression dehydrator 16 is provided for dewatering the residue conveyed by the compressor dehydrator 16, and the residue dehydrated by the compression dehydrator 16 is allowed to fall from the residue discharge port 18. Furthermore, a drive device 20 for rotationally driving the screw blades 10 is provided near the liquid discharge port 18 .

Next, reference is made to FIGS. 2 and 3. In particular, the housing 2, the drum screen 8 disposed therein, and the screw blades 10 are shown in detail in these figures.

The drum screen 8 is comprised of a number of generally annular plate members 22, which are spaced apart by axially extending support members 24 at their outer peripheries. A large number of slits 26 are formed between the annular plate members 22. Annular plate member 2
2 and the support member 24 are fixed to each other by a suitable method, for example, M contact. At both ends of the drum screen 8 are provided end plates 28, 30 as shown. These end plates 28 , 30 secure the support member 24 and the drum screen 8 relative to the housing 2 . The end plate 28 on the left side in FIG. 2 supports the shaft 32 of the screw blade 10 through a bearing 34. On the other hand, the right end plate 30 connects the housing 2 and the pipe 14 of the screw conveyor 12.

The screw blade 10 is integrally fixed to a shaft 32 that extends rotatably in the axial direction from the center of the drum screen 8. The outer diameter of the screw blade 10 is slightly smaller than the inner diameter of the annular plate member 22, and a large number of elongated rectangular sludge scraping claws 36 are provided at the top of the screw blade 10. These scraping claws 36 have a predetermined thickness so as to be able to freely move through the slits 26 between the annular plate members 22 of the drum screen 8, and extend radially outward close to the support member 24.

The drum screen 8 is housed in a housing 2 whose main part is cylindrical, and the space inside the housing 2 is divided into an upstream space 38 and a downstream space 40.
8 is connected to the inflow pipe 4, and the downstream space 40 is connected to the outflow pipe 6.
are communicating. As best shown in FIG. 3, the upper portion of the annular plate member 22 is cut out to open into the upstream space 38. Also, on the inner wall of housing 2,
A sludge cleaning nozzle 42 for spraying water toward the drum screen 8 is attached.

Further, a scraper 44 is attached to the inner wall of the bouncing member to remove the residue attached to the residue scraping claw 36.

Next, refer to FIG. The embodiments shown in FIGS. 1 to 3 are suitable when the flow path is tubular, but the embodiment shown in FIG. 4 is preferable when the flow path is like a sewer. .

In this case there is no housing 2 and the drum screen 8 is placed directly in the flow path. In this embodiment, the device is supported on a pedestal 48 so that it can be raised and lowered by a lifting device 46 in accordance with changes in the water surface.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

(1) Foreign matters that enter the slits of the drum screen are constantly scraped off by the residue scraping claws attached to the tops of the screw blades, so the screen is unlikely to become clogged even when used for a long time.

(2) A residue cleaning nozzle is attached to the housing,
Since water can be injected towards the drum screen as needed, it further ensures the clogging prevention effect in conjunction with the above-mentioned scraping claws.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing an embodiment of a scum removal device according to the present invention. FIG. 2 is a sectional view taken along the line ■--■ in FIG. 3 showing the drum screen and screw blades. FIG. 3 is a sectional view taken along line 11 in FIG. 2. FIG. 4 is a front view schematically showing another embodiment of the scum removing device according to the present invention. 2...Housing 4...Inflow pipe 6...Outflow pipe 8...Drum screen 10...
Screw blade 12...Transporting device 14...Pipe 16...Compression dehydration device 18...Residue discharge port 20...Drive device 22...Annular plate member
24...Supporting member 6...Slit 28. 2... Shaft 6... Sludge scraping claw 0... Downstream space 4... Scraper 8... Frame 0... End plate 4... Bearing 8... Upstream space 2 ...Residue cleaning nozzle 6...Removal device chu layer ((

Claims (4)

[Claims] (1) A sludge remover for removing sludge from the fluid, consisting of a drum screen having an opening that opens toward the flow of the fluid to be treated, and a screw blade rotatably disposed within the drum screen. The drum screen comprises a number of axially spaced annular plate members, and the screw blade has an outer diameter slightly smaller than an inner diameter of the annular plate member, and the screw blade has an outer diameter slightly smaller than an inner diameter of the annular plate member. A sludge removing device characterized in that a sludge scraping claw is attached to the top of the drum screen and moves within a slit between annular plate members of the drum screen. (2) The drum screen is housed in a sealed housing, and divides the inner space of the housing into an upstream space and a downstream space, and a fluid inflow pipe and a fluid discharge pipe are provided on the upstream and downstream sides of the housing, respectively. 2. The sludge removing device according to claim 1, wherein the sludge removing device can be piped. (3) The sludge removal device is characterized in that the housing is provided with a sludge washing nozzle for spraying water toward the drum screen to wash the sludge inside the drum screen. (4) An elongated wide pipe is connected to the housing, and the screw blade extends integrally within the wide pipe, and the pipe and the screw blade constitute a sludge conveying device. A sludge removing device characterized in that a dehydration mechanism for compressing and dehydrating the sludge is provided at the end of the sludge removing device.