JPH11216310A - Foreign matter removing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foreign matter removing apparatus capable of efficiently and reliably transporting foreign matter collected by an annular screen. SOLUTION: A part of a screw conveyer extended in a transportation route from an annular screen for collecting foreign matter in a fluid on the inner circumference face is a ribbon screw having no rotary axis. Either a foreign matter holding plate 12c extended in the transportation direction is installed in the inside of a rotary blade 12b or the straight line starting from any outer circumferential point of a rotary blade to an inner circumferential point of the rotary blade at the shortest distance from the outer circumferential point is inclined in the transportation direction at preferably 10-50 degree inclination angle to the transportation direction. It is further preferable to install a scraping means touching the inner circumference of the annular screen and/or the inner face in the transportation direction is preferably and to form an installation groove for fixing the scraping means in the rear side of the foreign matter transportation face of the rotary blade of the screw conveyer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contaminant removal apparatus used in a sewage treatment facility such as a sewage treatment plant, for separating and removing contaminants from sewage, dehydrating under pressure, and discharging.

[0002]

2. Description of the Related Art In a sewage treatment facility, a drainage channel is provided so as not to impede pumps, piping and treatment facilities.
A contaminant removing device for removing contaminants is installed, and contaminants attached to a screen of the contaminant removing device are automatically collected and discharged. The contaminants captured by the screen, as it is, contain a large amount of human feces and spoilable organic substances, have a high water content, and are therefore unsanitary for transportation and the like, and are poor in handling. In addition, in landfills such as landfills, it causes odor and groundwater pollution. Therefore, a contaminant removing device having a function of dehydrating contaminants has been used.

[0003] There is an annular screen type in the contaminant removal apparatus. In the annular screen, a wedge screen is bundled and processed to form a slit to form an annular screen, or a punched metal plate having a number of fine holes is annularly formed. Annular screens, etc.

[0004]

As shown in FIG. 7, a conventional contaminant removing apparatus includes an annular screen 6 having an opening 6a and a conveying path 1 connected to the annular screen 6 (both are screwed on the front side). (To show a conveyor), a contaminant discharge port 18 disposed at the end of the transport path 1, a screw conveyor 22 disposed in the annular screen 6 and the transport path 1, and a screw It comprises a rotating shaft 3 for driving the conveyor 22 and a screw conveyor driving device 4.

The sewage in the water channel flows through the opening 6 a of the annular screen 6, and impurities in the sewage are captured on the inner peripheral surface of the annular screen 6. Rotating screw conveyor 22
The contaminants are raked up and transported. The contaminants conveyed are dehydrated by the drainage action of gravity and discharged out of the apparatus through the contaminant discharge port 18.

Further, in order to efficiently guide foreign substances to the annular screen 6, a foreign substance removing apparatus having a screw conveyor 22 partially constituted by a ribbon screw 22b has been considered. Here, the ribbon screw refers to a screw in a spiral ribbon shape without a rotating shaft. The use of the ribbon screw 22b eliminates the need for a bearing at the opening 6a, and facilitates the flow of water to be treated into the annular screen 6 because there is no rotating shaft.

However, the ribbon screw 22b
The contaminant conveying surface of the rotary blade is substantially perpendicular to the conveying direction. Therefore, when the amount of contaminants to be conveyed is large or when the installation angle of the contaminant removing device is large, the contaminants on the contaminant transfer surface of the rotating blade of the ribbon screw 22b and being conveyed hit the rotating shaft. There is a problem that the material may spill out from the void portion and the efficiency of transporting the contaminants may be reduced.

Further, there is a slight gap between the annular screen 6 and the rotating blades of the screw conveyor 22, and if the foreign matter is not scraped, the screen slit will be clogged, thereby reducing the efficiency of removing the foreign matter. There was a problem.

[0009] In view of the above problems, an object of the present invention is to provide a contaminant removal apparatus that efficiently conveys contaminants contained in wastewater.

[0010]

According to one aspect of the present invention, there is provided an apparatus for removing contaminants, which has an opening for introducing a fluid, and an annular screen for capturing contaminants in the fluid on an inner peripheral surface. ,
A conveying path connected to the annular screen, a screw conveyor extending from the inside of the annular screen into the conveying path, a pressurized dewatering unit provided on the conveying path, and pressurized and dewatering the contaminants; And a screw conveyor driving device for driving a screw conveyor, at least a part of the screw conveyor is constituted by a ribbon screw, and the inner periphery of the rotating blades of the ribbon screw is moved in the transport direction. An extended impurity holding plate is provided.

According to another aspect of the contaminant removal apparatus of the present invention, the device has an opening for introducing a fluid, and is connected to the annular screen for capturing contaminants in the fluid on the inner peripheral surface, and to the annular screen. A conveying path, a screw conveyor extending from the inside of the annular screen into the conveying path, a pressurizing and dewatering unit provided in the conveying path and pressurizing and dewatering the contaminants, and a contaminant discharging the pressurized and dewatered contaminants A screw conveyor driving device for driving the screw conveyor, wherein at least a part of the screw conveyor is composed of a ribbon screw, and the rotating blades of the ribbon screw may have any outer circumferential point of the rotating blade, and A straight line connecting the rotating blade inner peripheral point located at the shortest distance from the point inclines in the transport direction.

Preferably, the rotating blade of the ribbon screw has a starting point at an arbitrary outer peripheral point of the rotating blade, and a side connecting an inner peripheral point of the rotating blade at the shortest distance from the outer peripheral point has the outer peripheral point as a starting point, It inclines so as to form an angle of 10 to 50 degrees with respect to one side connecting the rotation axis center point located at the shortest distance from the outer peripheral point with respect to the transport direction.

Preferably, the rotating blades of the screw conveyor have a scraping means in contact with the inner peripheral surface of the annular screen and / or the inner surface of the conveying path, and the scraping means is formed of a contaminant conveying surface of the rotating blades of the screw conveyor. And a mounting groove for fixing to the back side.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a ribbon screw to which a holding plate is attached. As shown in FIG. 1, a ribbon screw 12 arranged in a transport path or an annular screen
Along the inner peripheral edge of b, the holding plate 12c is provided upright with respect to the blades of the ribbon screw 12b so as to prevent falling of foreign matters.

FIG. 3 is an enlarged view of a part of the ribbon screw 12b and the holding plate 12c. It is desirable that the holding plate 12c is made of a corrosion-resistant stainless steel member and is directly welded to the ribbon screw 12b so that foreign substances are not entangled.

The thus configured ribbon screw 12
The contaminants can be effectively conveyed by placing the contaminants on the rotating blades on the lower side of the conveyance path in b.

FIG. 2 shows an embodiment of the apparatus for removing impurities having the ribbon screw shown in FIG. 1 arranged in a waterway.

The apparatus for removing contaminants according to the present embodiment has an opening 6a.
, A conveying path 1 extending from the upper end of the annular screen 6 (the front side is broken to show a screw conveyor), and a contaminant discharge disposed at the end of the conveying path 1. An outlet 18, a screw conveyor 12 extending in the annular screen 6 and the transport path 1, and a rotating shaft 3 for rotating the screw conveyor 12.
And a screw conveyor driving device 4.

In the apparatus for removing impurities, a part of the screw conveyor 12, specifically, a part immersed in the flow of sewage is constituted by a ribbon screw 12b. Like the conventional screw, the ribbon screw 12b has rotating blades formed so that its cross-sectional shape is orthogonal or substantially orthogonal to the center of rotation. However, as shown in FIG. A holding plate 12c extending in the direction of the discharge port 18 is provided, and a connecting portion between the holding plate 12c and the blade of the ribbon screw 12b has an L-shaped cross section as shown in FIG.
However, the shape may not be L-shaped, but may be curved or inclined.

The sewage in the water channel flows in from the opening 6a of the annular screen 6, is caught by the inner peripheral surface of the annular screen 6, and rotates the ribbon screw 12 to scrape impurities.

In front of the foreign matter discharge port 18, a pressurized dewatering section 12e for pressurizing and dewatering the conveyed foreign matter is provided. The pressurized dewatering section 12e is composed of an inner cylinder and an outer cylinder provided to surround the rotating shaft. The inner cylinder is provided with a large number of drainage holes for the dehydrated separation liquid, and is provided with a drainage means for discharging the dehydration separation liquid. Provided on the outer cylinder. The drained separated liquid discharged through the drain hole is returned to the water channel via the discharging means. The inner cylinder is not limited to the discharge hole, but may be provided with a drain pipe or the like to discharge the dehydrated separated liquid to the outer cylinder.

In the ribbon screw 12b, the contaminants captured by the annular screen 6 are scraped off by the rotating blades, and are conveyed in contact with the rotating blades and the inner peripheral surface of the annular screen 6 and the conveying path 1. In the case of a rotating blade whose cross section is perpendicular or nearly perpendicular to the center of rotation (extension of the rotating shaft 3), if the amount of impurities is large, the blade is easily spilled from the center gap. Therefore, with the holding plate 12c attached along the inner peripheral edge of the ribbon screw 12b of the present invention, it is possible to prevent foreign substances from spilling into the central gap portion, and to efficiently convey.

FIG. 4 shows a rotating blade of a ribbon screw having an inclined angle according to a different embodiment of the present invention, and FIG. FIG. 6 shows a state in which the impurity removing device having the ribbon screw is disposed in a water channel.

The apparatus for removing contaminants according to the present embodiment has an opening 6a.
, A conveying path 1 extending from the upper end of the annular screen 6 (the front side is broken to show a screw conveyor), and a contaminant discharge disposed at the end of the conveying path 1. An outlet 18, a screw conveyor 2 extending in the annular screen 6 and the transport path 1, a rotating shaft 3 for rotating the screw conveyor 2, and a screw conveyor driving device 4.

In the apparatus for removing contaminants, a part of the screw conveyor 2, specifically, a part immersed in the flow of sewage is a ribbon screw 2 b having no rotating shaft 3, and the rotation of the ribbon screw 2 b The cross-sectional shape of the blade extends from the outer peripheral portion to the inner peripheral portion in a direction inclined toward the impurity discharge port 18. That is, the ribbon screw 2b
The rotating blade of the starting point is an arbitrary outer peripheral point of the rotating blade,
One side connecting the rotating blade inner circumferential point located at the shortest distance from the outer circumferential point is 10 to 50 degrees in the transport direction with respect to one side connecting the rotating axis center point located at the outer circumferential point and the shortest distance from the outer circumferential point. At an angle of inclination.

As in the embodiment of FIG. 2, the sewage in the channel is
It flows in from the opening 6a of the annular screen 6, is captured by the inner peripheral surface of the annular screen 6, and rotates the ribbon screw 2 to scrape impurities. Then, just before the foreign matter discharge port 18, the conveyed foreign matter is depressurized and dehydrated by the pressurized dewatering unit 2 e.

In the ribbon screw 2b of this embodiment, the rotary blades are inclined in the transport direction so that the foreign materials are held between the impurity transport surface of the rotary blade and the inner peripheral surface of the annular screen 6 or the transport path 1. Therefore, even when the amount of contaminants to be conveyed is large or the installation angle of the conveyance path 1 is large, the contaminants can be efficiently conveyed without spilling.

It is preferable that the inclination angle is 10 to 50 degrees. Below 10 degrees, conventional ribbon screw 2
As in 2b (FIG. 7), the rate at which contaminants drop during transport remains high, and the problem is not solved. Also, 50
It is not only technically difficult to process an inclination angle exceeding 50 degrees, but when the inclination angle exceeds 50 degrees, the function of pressing the impurities against the annular screen 6 and the inner peripheral surface of the conveyance path 1 is more effective than the function of transporting the impurities. It becomes so strong that it is not possible to efficiently transport foreign substances.

As an example of a method of processing the rotating blades of the ribbon screw 2b, a hollow donut-shaped flat plate (made of stainless steel) cut in one place in advance is adjusted according to the interval (pitch) of the rotating blades. There is a method of pressing a part of a flat plate to bend spirally by using a mold or the like having a degree of bending to bend spirally and having an inclination angle as needed. The flat plate is gradually curved and unfolded, and finally a part of the spirally curved ribbon screw 2b having a preset pitch is obtained. Alternatively, a method of simultaneously pressing all the flat plates may be used. A part of the ribbon screw 2b thus completed is
The ribbon screw 2b is obtained by joining the necessary portions by welding or the like.

In the embodiment shown in FIG. 4, the ribbon screw 2b
A brush 9 extending in the outer peripheral direction is attached to the rotary blade near the outer peripheral end of the surface of the rotary blade opposite to the transport direction. The brush 9 usually has one end fixed by bundling an elastic linear material such as nylon. The brush 9 is sandwiched between a brush retainer 10 and a rotating blade, and is fixed with a bolt 8 and a nut 8a. By this fixing method, the tip of the brush 9 can be easily adjusted so as to be in contact with the inner peripheral surface of the annular screen 6 due to rigidity, and the foreign matter caught in the screen slit of the annular screen 6 is scraped out by the brush 9 and transported. Is done. By attaching the brush 9 to the surface of the rotating blade opposite to the conveying direction, the scraped-out foreign matter does not become entangled with the brush 9, so that maintenance becomes easy.

Further, as shown in an enlarged view in FIG. 5, by providing a groove 2g on the surface of the rotary blade 2b in contact with the brush 9, the brush 9 can be firmly fixed by the brush retainer 10,
In addition, since the bundled base of the brush 9 fits into the groove 2g and no foreign matter is caught between the brush 9 and the rotating blade, the maintenance of the brush 9 is further facilitated. Needless to say, the brush 9 can be applied to the embodiment of FIG.

In the above embodiment, the foreign matter removing device having the ribbon screw to which the holding plate is attached and the foreign matter removing device having the inclined ribbon screw are described. This is easier to carry out than a process in which the rotating blades of the ribbon screw are inclined, and the effect can be obtained at low cost.

[0034]

As described in detail above, in the impurity removing apparatus of the present invention, the holding plate is attached to the rotating blade of the ribbon screw or the inclined blade is inclined, so that the impurity captured by the annular screen spills. And can be transported efficiently.

Furthermore, a brush is provided on the rotating blades of the screw conveyor so that the contact relationship with the annular screen can be easily adjusted, so that foreign substances caught by the annular screen can be effectively scraped and conveyed. Since the brush is arranged with a groove near the outer periphery of the surface on the opposite side to the transport direction, the maintenance is easy because the foreign matter does not first enter the rotating blade.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a part of a ribbon screw in which a holding plate is attached to an inner peripheral portion in one embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing a state where the embodiment shown in FIG. 1 is disposed in a water channel.

FIG. 3 is a partially broken side view showing a cross-sectional shape of a rotary blade of the ribbon screw.

FIG. 4 is a partially broken plan view showing a rotating blade of a ribbon screw having an inclination angle.

FIG. 5 is an enlarged sectional view of a main part of a rotary blade of the ribbon screw of FIG. 4;

FIG. 6 is a partially broken side view showing a state in which the embodiment shown in FIG. 4 is arranged in a water channel.

FIG. 7 is a partially cutaway side view showing a state in which an example of the related art is arranged in a water channel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyance path 2, 12, 22 Screw conveyor 2b, 12b, 22b Ribbon screw 2e, 12e, 22e Pressure dehydration part 2f, 12f, 22f Screen part 2g Groove 3 Rotation axis 4 Screw conveyor drive device 6 Ring screen 6a Opening 7 Support 7a Supporting device 8 Bolt 8a Nut 9 Brush 10 Brush holder 11 Cleaning device 12c Holding plate 18 Impurity discharge port

Claims (4)

[Claims] 1. An annular screen having an opening for introducing a fluid and catching contaminants in the fluid on an inner peripheral surface, a transport path connected to the annular screen, and extending from the annular screen into the transport path. Existing screw conveyor, a pressurized dewatering unit provided on the transport path for pressurizing and dewatering impurities, a contaminant discharge port for discharging pressurized and dewatered contaminants, and a screw conveyor driving device for driving the screw conveyor Wherein at least a part of the screw conveyor is formed of a ribbon screw, and an impurity holding plate extending in the transport direction is provided on an inner periphery of a rotating blade of the ribbon screw. And a contaminant removal device. 2. An annular screen having an opening for introducing a fluid, for capturing impurities on the fluid on an inner peripheral surface, a transport path connected to the annular screen, and extending from the annular screen into the transport path. Existing screw conveyor, a pressurized dewatering unit provided on the transport path for pressurizing and dewatering impurities, a contaminant discharge port for discharging pressurized and dewatered contaminants, and a screw conveyor driving device for driving the screw conveyor And at least a part of the screw conveyor is formed of a ribbon screw, and the rotating blades of the ribbon screw have an arbitrary outer peripheral point of the rotating blade, and a rotation that is at the shortest distance from the outer peripheral point. A contaminant removal device, wherein a straight line connecting to an inner peripheral point of the blade is inclined in the transport direction. 3. The rotating blade of the ribbon screw has a starting point at an arbitrary outer peripheral point of the rotating blade, and a side connecting an inner peripheral point of the rotating blade at a shortest distance from the outer peripheral point has the outer peripheral point as a starting point. 3. The foreign matter removing apparatus according to claim 2, wherein the apparatus is inclined so as to form an angle of 10 to 50 degrees with respect to a transport direction with respect to one side connecting the rotation axis center point which is the shortest distance from the outer peripheral point. 4. A rotary blade of a screw conveyor, a scraping means in contact with an inner peripheral surface of an annular screen and / or an inner surface of a transport path, and the scraper is fixed to a back side of a contaminant transport surface of the rotary blade of the screw conveyor. The foreign matter removal device according to any one of claims 1 to 3, further comprising: a mounting groove for performing the operation.