JP3757215B2 - Dust remover - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust removing device used for removing dust contained in sewage scum or sludge in a sewage treatment facility or the like.
[0002]
[Prior art]
For example, in a sewage treatment plant, solids such as dust contained in the sewage are removed as finely as possible because they can impede the pumping pump or become floating scum in the storage tank, causing rot and odor. It is desirable to do. 2. Description of the Related Art Conventionally, for the purpose of removing such fine dust, a dust removing device incorporating a dust removing drum having an outer peripheral surface as a screen is used.
[0003]
As shown in FIG. 6, this type of dust remover includes an inlet 51 for introducing raw water into the box-shaped case body 50, an outlet 52 for leading the filtered water to the outside, A discharge port 53 for discharging the dust removed from the raw water to the outside is provided. Below the discharge port 53, a transport belt 54 for transporting the dust discharged from the discharge port 53 is installed.
[0004]
Inside the case body 50, an inflow passage 55 communicating with the introduction port 51 and an outflow passage 56 communicating with the outlet port 52 are defined by partition walls 57. The inflow path 55 and the outflow path 56 communicate with each other via a dust removing drum 58. The dust removing drum 58 has a screen 59 on the outer peripheral surface, and dust contained in the raw water is captured by the screen 59 and removed from the raw water.
[0005]
The dust removing drum 58 is rotationally driven by a rotational driving device 61 using a motor 60 as a driving source. When the raw water flowing into the inflow passage 55 passes through the screen 59 of the dust removal drum 58, dust contained in the raw water is captured. The dust captured by the screen 59 is guided to a scraper 62 installed at a position opposite to the inflow path 55 by the rotation of the dust removing drum 58. The scraper 62 is provided with a comb-like scraping portion 63 at the tip, and the scraping portion 63 scrapes dust adhering to the dust removing drum 58.
[0006]
The dust removing drum 58 is formed by forming slits with a predetermined groove width at predetermined intervals by cutting a metal pipe with a lathe. The scraping portion 63 of the scraper 62 is engaged with each slit, whereby the dust trapped in each slit is scraped out.
[0007]
There is also a dust removing device in which a rotating scraper 70 as shown in FIG. 7 is employed instead of the fixed scraper 62 described above (see, for example, Patent Document).
[0008]
[Patent Literature]
JP-A-8-199538
This rotary scraper 70 is provided with a plurality of ring-shaped teeth 71 meshing with the slits of the screen 59 of the dust removing drum 58 on the outer peripheral surface. The dust removing drum 58 and the scraper 70 are rotationally driven in the same rotational direction by a rotational driving device 61 having a motor 60 as a driving source.
[0010]
The dust trapped between the teeth 71 of the scraper 70 is scraped off by a fixed scraper 72. The fixed scraper 72 has a comb-like scraping portion 73 that meshes with teeth 71 of the rotary scraper 70.
[0011]
[Problems to be solved by the invention]
In the dust removing drum 58 shown in FIG. 6 and FIG. 7 described above, since the lattice-like screen 59 is manufactured by mechanical cutting, the slit width of the screen 59 cannot be reduced and fine dust cannot be captured sufficiently. Further, since the grid of the screen 59 has a rectangular cross section, there is a problem that the efficiency of filtration is poor.
In order to solve this problem, a dust removing drum is also proposed in which a screen on the outer peripheral surface is wound around a wedge wire in a spiral shape. In this dust removal drum, the slit width of the screen can be set small, so that even fine dust can be captured. In addition, since the wedge wire having a shape other than a rectangle (for example, a triangular shape) can be used, the efficiency of filtration is enhanced.
[0012]
However, since the slit of this dust removing drum screen is spiral, the rotary scraper 62 has a fixed scraper 62 having a comb-like scraping portion 63 and a plurality of ring-shaped teeth 71 in the slit. The scraper 70 cannot be engaged. This is because when the dust removing drum and the scrapers 62 and 70 are engaged with each other, the scrapers 62 and 70 are screwed by rotation of the dust removing drum. As a result, it is not easy to remove the dust trapped in the slits, causing a problem of clogging the screen.
[0013]
The present invention has been made paying attention to the above problem, and even if a dust removing drum in which the screen of the outer peripheral surface is formed by winding a wedge wire in a spiral shape is used as the dust removing drum, the dust trapped between the slits of the screen is used. An object of the present invention is to provide a dust removing device that can be easily and reliably removed.
[0014]
[Means for Solving the Problems]
The dust removing device according to the present invention is a dust removing drum which is formed by introducing water containing dust and removing dust, and then deriving the water after dust removal, and the screen of the outer peripheral surface is formed by winding a wedge wire spirally And a scraper having helical teeth meshing with the slits of the screen, and a drive device for rotating the dust removing drum and the scraper. The drive device rotates the dust removing drum and the scraper in the same rotational direction at the same rotational speed.
[0015]
In a preferred embodiment of the present invention, the screen is provided with a wedge wire having a triangular cross-sectional shape so that the width of the slit expands from the outer peripheral surface toward the center in order to make it easy for the dust trapped in the slit to drop off. It is formed using. Moreover, if the wedge wire of such a cross-sectional shape is used, the efficiency of filtration can also be improved.
[0016]
A preferred embodiment of the present invention further includes a second scraper for scraping dust trapped between the teeth of the scraper, thereby preventing clogging of the scraper.
[0017]
[Action]
Since the dust removal drum of the dust removal apparatus according to the present invention is formed by spirally winding the wedge wire around the screen on the outer peripheral surface, the slit width of the screen is set to be sufficiently small, and fine dust is captured by the screen. The dust trapped on the screen is guided to the position of the scraper by the rotation of the dust removing drum. Since the scraper teeth mesh with the screen of the dust removal drum, the dust trapped in the slit of the screen is removed by the scraper teeth. Since the dust removing drum and the scraper rotate in the same rotational direction at the same rotational speed, the scraper is not screwed by the rotation of the dust removing drum, and there is no problem in removing the dust.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show the configuration of a dust removing apparatus according to an embodiment of the present invention.
In the dust removing apparatus of the illustrated example, the outer wall is formed by the box-shaped case body 1 as a whole. The front wall 1a of the case body 1 is provided with an introduction port 2 for introducing raw water into the interior and a discharge port 3 for deriving filtered water to the outside. On the back side of the case body 1, a discharge port 4 for discharging the dust removed from the raw water to the outside is provided downward. Below the discharge port 4, a belt conveyor 45 for conveying the dust discharged from the discharge port 4 is installed.
[0019]
Inside the case body 1, an inflow path 6 communicating with the introduction port 2 and an outflow path 7 communicating with the outlet port 3 are defined by partition walls 8. The partition wall 8 extends partway inside, and a dust removing drum 10 is disposed in a space behind the partition wall 8. Side walls 8 a and 8 b are provided at both ends of the partition wall 8 to close the gap between the side walls 1 b and 1 c of the case body 1 and the dust removing drum 10. The inflow path 6 and the outflow path 7 are communicated with each other through the dust removing drum 10.
In the interior of the space where the dust removing drum 10 is installed, there is a rotary scraper (hereinafter referred to as “first scraper”) 30 for scraping the dust trapped by the dust removing drum 10 and a first scraper 30. A fixed-type scraper (hereinafter referred to as “second scraper”) 40 for scraping off dust adhering to the substrate is disposed. Further, a discharge passage 9 for discharging dust scraped off by the first and second scrapers 30 and 40 is formed in the back, and the discharge port 4 is opened below the discharge passage 9.
[0020]
The dust removing drum 10 has a rotating shaft 11 rotatably supported by bearings 12 and 13 provided on both side walls 1 b and 1 c of the case body 1. One end of the rotating shaft 11 protrudes outward from the side wall 1c of the case body 1, and two driven wheels 22 and 26 are attached to the protruding ends.
[0021]
A motor 21 as a drive source is attached and fixed to the upper surface of the case body 1. A drive wheel 23 is mounted on the motor shaft of the motor 21, and a rotation drive device 20 is configured by winding a chain 24 between the drive wheel 23 and the driven wheel 22. The rotational drive device 20 is for driving the dust removing drum 10 and a scraper 30 described later in the same rotational direction at the same rotational speed (the number of revolutions per unit time).
[0022]
The dust removing drum 10 has a screen 14 on the outer peripheral surface. The dust contained in the raw water is captured by the screen 14 and removed from the raw water.
As shown in FIG. 3, the screen 14 is formed by winding a wedge wire 15 in a spiral shape, and the dust A is captured by the eyes of the screen 14. In the figure, 16 is a rod provided at equal angles between the end plates 17 and 18 at both ends, and the wedge wires 15 are wound around the outside of the plurality of rods 16 arranged in a circle at a predetermined pitch p, A spiral slit 19 is formed. In this embodiment, the screen 14 is formed by using a wedge wire 15 having a triangular cross section so that the width d of the slit 19 expands from the outer peripheral surface toward the center.
If the width d of the slit 19 is made thinner than the thickness of the hair contained in the dust, it is possible to prevent the hair from entering the slit 19 and getting entangled with the rod 16 or the like.
[0023]
As shown in FIGS. 4 (1) to (3), the wedge wire 15 has a rectangular cross section (see FIG. 4 (1)), a circular cross section (see FIG. 4 (2)), Various cross-sectional shapes such as a base-type (see FIG. 4C) can be used.
When the wedge wire 15 having a triangular cross section as in this embodiment or the wedge wire 15 having the cross section shown in FIGS. 4 (2) and (3) is used, the width of the slit 19 is directed from the outer peripheral surface toward the center. Since it spreads, the dust trapped in the slit 19 is easily dropped.
[0024]
As shown in FIG. 5, the first scraper 30 has a helical tooth 31 that meshes with a helical slit 19 constituting the screen 14 of the dust removing drum 10. The thickness t of the tooth 31 is smaller than the width d of the slit 19 of the screen 14, and the pitch q of the tooth 31 coincides with the pitch p of the slit 19.
[0025]
The rotation shaft 32 of the first scraper 30 is rotatably supported by bearings 33 and 34 provided on both side walls 1 b and 1 c of the case body 1. One end of the rotating shaft 32 protrudes outward from the side wall 1c of the case body 1, and a driven wheel 25 is mounted on the protruding end. A chain 27 is wound between the driven wheel 25 and a driven wheel 26 mounted on the rotary shaft 11 of the dust removing drum 10 to constitute the rotary drive device 20. The first scraper 30 is driven by the rotational driving device 20 in the same rotational direction as the dust removing drum 10 at the same rotational speed.
[0026]
The above-described second scraper 40 has a scraping portion 41 at the tip, and the scraper 41 is pressed against or brought into contact with the outer periphery of the first scraper 30 so that the teeth of the first scraper 30 It scrapes off the dust trapped between the two. In this embodiment, the scraping portion 41 has a flexible sponge-like shape so that it can easily enter the groove 35 between the teeth 31 of the first scraper 30 and can easily get over the teeth 31. It is configured with a member so that the dust trapped in the groove 35 is scraped out. In the second scraper 40, for example, the scraping portion 41 may have a flat plate shape, and the scraping portion 41 may be brought into contact with the tips of the teeth 31 of the first scraper 30.
[0027]
In the dust removing apparatus having the above-described configuration, the raw water that has flowed into the inflow path 6 from the inlet 2 of the case body 1 passes through the screen 14 of the dust removing drum 10 from the outside to the inside and then from the inside to the outside in order, and is filtered. Then, the filtered water is led out from the outlet 3 through the outflow passage 7.
When the raw water passes through the screen 14 of the dust removing drum 10, dust contained in the raw water is captured by the screen 14. Since the screen 14 is formed by spirally winding the wedge wire 15, the width d of the slit 19 of the screen 14 is sufficiently small, and fine dust is captured by the screen 14.
[0028]
The dust trapped by the screen 14 is guided to the position where the first scraper 30 is installed by the rotation of the dust removing drum 10. Since the teeth 14 of the first scraper 30 mesh with the screen 14 of the dust removing drum 10, the dust trapped in the slits 19 of the screen 14 is removed by the teeth 31 of the first scraper 30. Since the dust removing drum 10 and the first scraper 30 are rotating in the same rotational direction at the same rotational speed, the first scraper 30 is not screw-fed by the rotation of the dust removing drum 10 and can be used to remove dust. There is no hindrance.
[0029]
The dust trapped between the teeth 31 of the first scraper 30 is scraped off by the second scraper 40. The dust scraped off by each of the first and second scrapers 30 and 40 is discharged to the discharge path 9 and is discharged from the discharge port 4 onto the belt conveyor 45 through the discharge path 9.
[0030]
【The invention's effect】
According to the present invention, since the screen of the dust removing drum is formed by winding the wedge wire in a spiral shape, the screen can be made finer and fine dust can be reliably captured. In addition, since a wedge wire having a triangular cross section can be used, the efficiency of filtration can be increased. Furthermore, the scraper is provided with helical teeth that mesh with the screen, and the dust removing drum and the scraper are rotated in the same rotational direction at the same rotational speed, so that the scraper is not screwed by the rotation of the dust removing drum, Dust trapped in the screen can be removed easily and reliably.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing an internal configuration of a dust removing apparatus according to an embodiment of the present invention.
FIG. 2 is a rear view in which a part of the dust removing device of FIG. 1 is broken.
FIG. 3 is an enlarged sectional view showing a screen of a dust removing drum.
FIG. 4 is a cross-sectional view showing another embodiment of the screen of the dust removing drum.
FIG. 5 is a cross-sectional view showing a meshing state of the dust removing drum, the first scraper, and the second scraper.
FIG. 6 is a side view with a part broken away showing an internal configuration of a conventional dust removing device.
FIG. 7 is a partially cutaway side view showing the internal configuration of another conventional dust removing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case body 10 Dust removal drum 14 Screen 15 Wedge wire 19 Slit 20 Drive apparatus 30 1st scraper 31 Teeth 40 2nd scraper

Claims (3)

In a dust removal device that introduces water containing dust and removes dust, and then discharges the water after dust removal, the screen on the outer peripheral surface meshes with a dust removal drum formed by spirally winding a wedge wire and the slit of the screen A scraper having spiral teeth, and a driving device for rotating the dust removing drum and the scraper, wherein the driving device rotates the dust removing drum and the scraper in the same rotational direction at the same rotational speed. apparatus. 2. The dust removing device according to claim 1, wherein the screen is formed by using a wedge wire having a triangular cross-section so that the width of the slit expands from the outer peripheral surface toward the center. 3. The dust removing device according to claim 1, further comprising a second scraper for scraping dust collected between teeth of the scraper.

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