JP4611480B2 - Screen removal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a residue removing device, and more particularly, to a residue removing device that can prevent residue from becoming clogged in a receiving port of a hopper and preventing residue from being discharged from a residue discharge port of a dehydrator.
[0002]
[Prior art]
FIG. 3 is a schematic configuration diagram showing a conventionally known residue removing device. FIG. 4 is a schematic sectional view of the drum screen.
This debris removing device 500 includes a raw water introduction pipe 1 that introduces inflow raw water W including debris (such as scum of vegetable waste, feces, paper waste, etc.) and drops it from the inflow trough 1a to the inside of the drum screen 2, and a wedge. A drum having a wire arranged in a cylindrical direction, rotated by a drum motor 2a in a direction opposite to the falling direction of the inflowing raw water W, and separating the residue S from the filtered water F, and the outer peripheral surface of the drum screen 2 Are discharged from the drum screen 2 by a drum cleaning nozzle 3 for spraying cleaning water C, a filtered water tank 4 for receiving filtered water F falling from the drum screen 2, and a residue discharging guide 2b of the drum screen 2. A hopper 5 that receives the fallen residue S and a screw 6b that rotates the fallen residue S that has fallen from the hopper 5 by a dehydrating motor 6a. A dehydrator 6 that depresses against gravity and presses it against gravity and presses it against the residue discharge port 6c to dehydrate it, a dewatering drain receiver 7 that receives water dehydrated from the residue S, and a discharge from the residue discharge port 6c. The dewatering residue S 'that has been dropped is accommodated, and the residue receiving basket 8 is provided, and the controller 50 controls the rotation of the drum motor 2a and the dehydration motor 6a.
[0003]
[Problems to be solved by the invention]
The amount of residue contained in the inflowing raw water W is not constant and varies with time. That is, there is a period in which the inflow raw water W containing a large amount of residue is flowing, and there is a period in which the inflow raw water W containing almost no residue is inflow.
[0004]
When the inflow raw water W containing a large amount of debris flows in, the conventional debris removing device 500 continues to drop a large amount of debris from the drum screen 2 into the receiving port of the hopper 5. There was a problem that caused the bridge to become clogged.
[0005]
On the contrary, when the inflow raw water W containing almost no residue remains, the conventional residue removing device 500 continues to introduce the residue S introduced earlier by the rotation of the screw 6b. Since the residue S is not supplied, the residue S introduced earlier stays in front of the residue discharge port 6c, and is repeatedly sheared by the rotation of the screw 6b to become a paste, which serves as a lubricant. Even if new residue S is supplied, there is a problem in that it cannot slide against gravity due to slipping, and the residue S cannot be discharged from the residue discharge port 6c.
[0006]
Accordingly, a first object of the present invention is to provide a residue removing device that can prevent residue from clogging in a receiving port of a hopper.
A second object of the present invention is to provide a residue removing device that can prevent residue from being unable to be discharged from the residue outlet of the dehydrator.
[0007]
[Means for Solving the Problems]
In a first aspect, the present invention provides a drum screen that separates inflow raw water containing slag into filtered water and separates the slag, a hopper that receives the slag discharged from the drum screen and dropped, and dropped from the hopper. A debris removal device comprising a dewatering machine for dewatering by depressurizing the debris by pressing against the gravity with a screw and pushing it against the debris discharge port, and provided with a hopper cleaning nozzle for injecting water into the hopper A debris removing device is provided.
In the debris removal apparatus according to the first aspect, water is sprayed from the hopper cleaning nozzle to the hopper, so that the debris caught in the receiving port of the hopper is immediately washed away and no bridge is caused. Therefore, even if the inflow raw water containing a large amount of debris flows in, the debris will not clog the hopper receptacle. In addition, since the residue remaining in the dehydrator is washed with the water sprayed on the hopper, the residue can be dehydrated and cleaned.
[0008]
According to a second aspect, the present invention provides a residue removing device, characterized in that in the residue removing device according to the first aspect, a control means for intermittently injecting the water is provided.
In the residue removing device according to the second aspect, since the water is intermittently ejected from the hopper cleaning nozzle to the receiving port of the hopper, the cleaning water can be saved.
[0009]
In a third aspect, the present invention provides a drum screen that separates the inflow raw water containing the residue into filtered water, a hopper that receives the residue that has been discharged from the drum screen and dropped, and has dropped from the hopper. A debris removing device comprising a dewatering machine for dewatering by depressurizing the debris by pressing against the gravity with a screw and pushing it against the debris discharge port, and provided with control means for rotating the screw intermittently A debris removing device is provided.
In the residue removal device according to the third aspect, since the screw of the dehydrator is rotated intermittently, even if the residue stays in front of the residue discharge port, the time for shearing by the rotation of the screw is reduced. Therefore, no slipping occurs when a new residue is supplied, and the residue can be suitably discharged from the residue discharge port.
[0010]
In a fourth aspect, the present invention relates to a drum screen that separates inflow raw water including slag into filtered water, a hopper that receives the slag discharged from the drum screen and dropped, and dropped from the hopper. A dewatering device comprising a dewatering device for dewatering by depressurizing and dewatering by pressing against gravity with a screw to a residue discharge port, and a hopper washing nozzle for injecting water into the hopper, A debris removing device is provided, characterized by comprising control means for intermittently injecting water and rotating the screw intermittently.
In the debris removing apparatus according to the fourth aspect, water is jetted from the hopper cleaning nozzle to the hopper receiving port, so that the stag that is caught in the hopper receiving port is immediately washed away and no bridging occurs. Therefore, even if the inflow raw water containing a large amount of debris flows in, the debris will not clog the hopper receptacle. Further, since water is intermittently ejected from the hopper cleaning nozzle to the receiving port of the hopper, cleaning water can be saved. In addition, since the screw of the dehydrator is rotated intermittently, even if the residue stays in front of the residue discharge port, it takes less time to undergo shearing due to the rotation of the screw, making it difficult to form a paste. When this is supplied, slipping does not occur, and the residue can be suitably discharged from the residue discharge port. In addition, since the residue remaining in the dehydrator is washed with the water sprayed on the hopper, the residue can be dehydrated and cleaned.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited thereby.
FIG. 1 is a schematic cross-sectional view showing a residue removing device according to an embodiment of the present invention.
The residue removing device 100 is a drum having a raw water introduction pipe 1 for introducing inflow raw water W containing residue and dropping it from the inflow trough 1a into the drum screen 2 and a wedge wire arranged in a cylindrical direction. A drum screen 2 that is rotated by a drum motor 2a in a direction opposite to the direction in which W falls, and separates residue S from filtered water F; a drum cleaning nozzle 3 that injects cleaning water C onto the outer peripheral surface of the drum screen 2; A filtered water tank 4 that receives the filtrate F that has fallen from the drum screen 2, a hopper 5 that receives the residue S that has been discharged from the interior of the drum screen 2 by the residue discharge guide 2b of the drum screen 2, and its The residue S that has fallen from the hopper 5 is overlapped by the screw 6b rotated by the dehydration motor 6a to the residue discharge port 6c having a small diameter. A dehydrator 6 that depresses against the water and dehydrates by pressing, a dewatering drain receiver 7 that receives dewatered water from the residue S, and a residue S ′ after dewatering that has been discharged from the residue discharge port 6c and dropped. A hopper cleaning nozzle 10 for injecting cleaning water C toward the inclined surface of the receiving port of the hopper 5 and a residue receiving basket 8 and a part of the cleaning water C into the dehydrator 6; The hopper cleaning valve 10a includes a control device 20 that controls the rotation of the drum motor 2a and the dehydrating motor 6a and the opening and closing of the hopper cleaning valve 10a.
[0012]
FIGS. 2A and 2B are time charts illustrating opening / closing control of the hopper cleaning valve 10a and rotation control of the dehydrating motor 6a by the control device 20. FIG.
In FIG. 2A, the hopper cleaning valve 10a is alternately repeated, for example, in a “closed” state for 10 minutes and an “open” state for 30 seconds.
Further, the dehydrating motor 6a is repeatedly repeated, for example, in a “pause” state for 10 minutes and an “operation” state for 30 seconds.
Here, first, the hopper cleaning valve 10a is set in the “open” state, and the residue S is washed away from the hopper 5 to a position where it is entangled with the screw 6b of the dehydrator 6. Next, after the washing water contained in the residue S flows out to the dewatering drain receiver 7, it is preferable to "run" the dewatering motor 6a, that is, to operate the dewatering machine 6.
In FIG. 2B, the hopper cleaning valve 10a is alternately repeated, for example, in a “closed” state for 3 minutes and an “open” state for 30 seconds.
Further, the dehydrating motor 6a is repeatedly repeated, for example, in a “pause” state for 10 minutes and an “operation” state for 30 seconds.
Here, the residue S remaining in the dehydrator 6 is repeatedly washed with the washing water sprayed on the hopper 5 and then dehydrated, so that the discharged residue S ′ is more purified. It can be.
The introduction of the inflow raw water W and the rotation of the drum motor 2a are performed continuously. Further, the spray of the cleaning water C from the drum cleaning nozzle 3 may be continuous or intermittent. When the injection of the cleaning water C from the drum cleaning nozzle 3 is intermittent, an independent valve for that purpose may be provided, or the hopper cleaning valve 10a may also be used.
[0013]
(Example)
Inflow raw water W is household wastewater that has passed through a settling basin and a coarse screen in the previous stage, and is BOD 200 mg / l and turbidity component 200 mg / l.
The residue S discharged from the drum screen 2 has 98% hair, 0.4% hair, 1.5% paper, 0.1% plastic, and a moisture content of 92-95%. It was.
The hopper cleaning valve 10a repeats a 10-minute “closed” state and a 30-second “open” state alternately, and slightly deviates from this to dehydrate the motor 6a in a 10-minute “pause” state and 30-second state. The "running" state for 2 seconds was repeated alternately.
The water content of the residue S ′ discharged from the residue discharge port 6c of the dehydrator 6 was 75 to 85%.
Although the operation was continued for 3 months, the residue S did not clog the receiving port of the hopper 5. Further, the residue S ′ could not be discharged from the residue discharge port 6 c of the dehydrator 6.
[0014]
【The invention's effect】
According to the residue removing device of the present invention, it is possible to prevent the residue from being clogged at the receiving port of the hopper when the inflow raw water containing a large amount of residue continues. In addition, it is possible to prevent the residue from being discharged from the residue discharge port of the dehydrator when the inflow raw water containing almost no residue continues.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a residue removing device according to an embodiment of the present invention.
FIG. 2 is a time chart showing opening / closing control of a hopper cleaning valve and rotation control of a dehydrating motor in the residue removing device according to one embodiment of the present invention.
FIG. 3 is a schematic configuration diagram showing an example of a conventional residue removing device.
FIG. 4 is a schematic cross-sectional view of a drum screen.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Raw water introduction pipe 1a Inflow trough 2 Drum screen 2a Drum motor 2b Sediment discharge guide 3 Drum washing nozzle 4 Filtration water tank 5 Hopper 6 Dehydrator 6a Dehydration motor 6b Screw 6c Shredder discharge port 7 Dehydrated drain receiver 8 Saddle container 10 Hopper cleaning nozzle 10a Hopper cleaning valve 20 Control device 100 Screen residue removal device C Cleaning water F Filtration water S Screen residue (before dehydration)
S 'residue (after dehydration W inflow raw water

Claims (1)

Drum screen that separates inflow raw water containing debris into filtered water and separates into debris, a hopper that receives fallen debris that has been discharged from the drum screen, and a debris that has fallen from the hopper to the debris outlet A debris removal device comprising a dehydrator that depresses against gravity with a screw and dewaters by squeezing the hopper, a hopper washing nozzle for injecting water into the hopper , and rotation and stop of the screw at a predetermined cycle A debris removing apparatus , comprising: a control unit that alternately repeats the operation of the hopper cleaning nozzle and causes the hopper cleaning nozzle to inject water into the hopper only when the screw is stopped .

Images