JP2020138112A - Deposit removing device and setting device - Google Patents

Abstract

To provide a deposit removing device capable of effectively removing a deposit depositing on an inclined portion.SOLUTION: A deposit removing device 7 includes: a lifting/lowering portion 62 that lifts and lowers an inclined portion 61 on which pollutants of a treatment water deposits; and a control portion that controls the lifting/lowering of the inclined portion 61 by the lifting/lowering portion 62.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a sediment removal device and a sedimentation device.

Conventionally, there have been known inventions relating to a compact thickener in which solid-liquid separation is performed in the upper part of the tank, clear water is discharged sideways, and solid particles are precipitated in the lower part and discharged downward (the following). See Patent Document 1).

The conventional compact thickener is provided with a solid-liquid separation device in the upper part of the tank and a solid particle precipitation device in the lower part. In this conventional thickener, an inclined plate for solid-liquid separation is provided in parallel along the liquid flow from the inflow pipe to the discharge pipe, and a partition plate for concentrating solid particles is provided below the inclined plate so as to intersect in the installation direction. , The inclined plate is provided with a device for vibrating the inclined plate (see the same document, claims, etc.).

According to this conventional vibrating thickener, the slurry residence time in the tank can be shortened from the conventional average of 120 minutes to 10 minutes. Further, the inclined plate provided in the tank is used to separate the liquid to be treated into solid and liquid, and the partition plate below the plate is used to concentrate the solid particles, so that a compact thickener can be obtained. Further, since the inclined plate is vibrated, the sedimented solid particles are prevented from adhering and staying on the inclined plate surface, and the solid-liquid separation function and the adhesion of the solid particles can be prevented (the same document, No. 1). See page 3, line 13 in the upper right column-line 5 in the lower left column).

JP-A-49-89253

For example, in a sedimentation basin that purifies treated water such as clean water, sewage, and other wastewater, a sedimentation device having an inclined portion such as an inclined plate or an inclined pipe is used. On the surface of the inclined portion of the settling device, pollutants and flocs in the treated water containing solid particles settle and accumulate. However, there is a possibility that the deposits deposited on the inclined plate cannot be sufficiently removed only by applying vibration to the inclined plate as in the conventional vibration type thickener.

The present disclosure provides a sediment removing device and a sedimentation device capable of removing sediment deposited on a slope more effectively than before.

One aspect of the present disclosure is characterized by comprising an elevating portion for raising and lowering an inclined portion on which a pollutant substance of treated water is deposited, and a control unit for controlling the elevating and lowering of the inclined portion by the elevating portion. It is a device.

Another aspect of the present disclosure is an inclined portion on which pollutants contained in treated water are deposited, an elevating portion for raising and lowering the inclined portion, and a control unit for controlling the elevating and lowering of the inclined portion by the elevating portion. It is a settling device characterized by being provided.

According to the above aspect of the present disclosure, it is possible to provide a deposit removing device and a sedimentation device capable of removing deposits deposited on the inclined portion more effectively than before.

The cross-sectional view which shows an example of the sedimentation basin to which the sedimentation apparatus which concerns on embodiment of this disclosure is applied. An enlarged cross-sectional view of the settling device and the deposit removing device according to the embodiment of FIG. An enlarged view of the elevating part constituting the deposit removing device of FIG. The pneumatic circuit diagram of the elevating part of FIG. The enlarged view which shows the modification of the elevating part of FIG. FIG. 3 is a perspective view showing a configuration example of an inclined portion constituting the settling device of FIG. The perspective view which shows the modification of the inclined part of FIG. The cross-sectional view which shows an example of the two-story sedimentation basin to which the sedimentation apparatus of this disclosure can be applied.

Hereinafter, embodiments of the settling device and the deposit removing device according to the present disclosure will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a settling basin 1 to which the settling device 6 and the sediment removing device 7 according to the embodiment of the present disclosure are applied. In FIG. 1, there are three axes: an X-axis parallel to the length direction of the sedimentation pond 1, a Y-axis parallel to the width direction of the sedimentation pond 1, and a Z-axis parallel to the depth direction (vertical direction) of the sedimentation pond 1. A Cartesian coordinate system consisting of axes is shown. In the following, each part of the settling basin 1, the settling device 6, and the sediment removing device 7 may be described using this Cartesian coordinate system.

The settling basin 1 of the present embodiment is a facility for purifying treated water such as clean water, sewage, and other wastewater. More specifically, the settling basin 1 of the present embodiment is, for example, the final settling basin of the sewage treatment facility, and the treated water that has passed through the sand basin, the first settling basin, and the aeration tank flows in.

The sedimentation pond 1 includes, for example, a treated water inflow section 2, a pit 3, a scraper 4, a blocking wall 5, a sedimentation device 6, a sediment removal device 7, an overflow trough 8, and treated water. It includes an outflow portion 9. The treated water inflow section 2 is the most upstream portion of the treated water in the settling pond 1, and the treated water treated by the equipment on the upstream side of the settling pond 1 is allowed to flow into the settling pond 1. The pit 3 is provided in a concave shape at the uppermost stream of the bottom of the sedimentation pond 1 which is inclined so that the upstream side (X-axis-side) of the treated water is lower than the downstream side (X-axis + side), for example. There is. Although not shown, the bottom of the pit 3 is provided with, for example, a discharge port connected to a pump.

The scraper 4 includes, for example, a pair of chains 41, a plurality of sprocket wheels 42, a plurality of flights 43, and a drive device 44. The pair of chains 41 are arranged substantially parallel to the length direction (X-axis direction) of the settling pond 1, that is, the flow direction of the treated water in the upstream portion of the settling pond 1. Further, the pair of chains 41 are arranged at intervals in the width direction (Y-axis direction) of the sedimentation pond 1, that is, in the horizontal direction intersecting the flow direction of the treated water.

The sprocket wheels 42 are provided at both ends of a shaft extending in the width direction of the sedimentation pond 1, for example. For example, the sprocket wheel 42 is arranged at the bottom of the settling pond 1 at intervals between the downstream side (X-axis + side) of the pit 3 and the most downstream part of the settling pond 1. Further, the sprocket wheels 42 are arranged at intervals on the downstream side of the pit 3 and the upstream side (X-axis − side) of the blocking wall 5 in the vicinity of the water surface of the treated water flowing through the sedimentation pond 1. In the example shown in FIG. 1, one chain 41 is bridged over four sprocket wheels 42 arranged on one side in the width direction (Y-axis direction) of the sedimentation pond 1, and one chain 41 is bridged to the other side in the width direction of the sedimentation pond 1. The other chain 41 is bridged over the four sprocket wheels 42 arranged.

The flight 43 is, for example, an elongated plate-shaped member extending in the width direction (Y-axis direction) of the sedimentation pond 1. In the width direction of the settling pond 1, one end of the flight 43 is attached to one chain 41 and the other end of the flight 43 is attached to the other chain 41. The plurality of flights 43 are provided at equal intervals over the entire circumference of the endless chain 41, for example, but in FIG. 1, some flights 43 are omitted for convenience.

The drive device 44 is composed of, for example, a motor, a gear, a chain, and the like, and rotates the sprocket wheel 42 to circulate drive the pair of chains 41. In the example shown in FIG. 1, the driving device 44 drives the sprocket wheel 42 so that the pair of chains 41 rotate clockwise. Most of the drive device 44 is located above the surface of the treated water.

The blocking wall 5 is arranged on the downstream side (X-axis + side) of the treated water flow direction in the upstream portion of the sedimentation pond 1 in the length direction (X-axis direction) of the sedimentation pond 1. The blocking wall 5 is provided, for example, substantially parallel to the width direction (Y-axis direction) and the depth direction (Z-axis direction) of the sedimentation pond 1 so as to block the flow of the treated water of the sedimentation pond 1. There is. The lower end of the flow blocking wall 5 is arranged above the bottom of the sedimentation pond 1 so as to block the flow of treated water from the treated water inflow portion 2 to the treated water outflow portion 9 from the surface of the treated water to a predetermined depth. It is provided in.

The settling device 6 includes an inclined portion 61 on which pollutants contained in the treated water are deposited, an elevating portion 62 for raising and lowering the inclined portion 61, and a control unit 63 for controlling the elevating and lowering of the inclined portion 61 by the elevating portion 62 (FIG. 4) and. Details of each part of the settling device 6 will be described later. Further, in the example shown in FIG. 1, a deposit removing device 7 for removing the deposits deposited on the inclined portion 61 is configured by the elevating portion 62 and the control portion 63. In other words, the settling device 6 of the present embodiment includes an inclined portion 61 and a deposit removing device 7.

The overflow trough 8 includes, for example, a plurality of V-shaped notches that allow the treated water from which the pollutants containing solid particles have settled and removed by passing through the settling device 6 to overflow. The treated water that has overflowed the overflow trough 8 flows out to the equipment on the downstream side of the settling pond 1 via, for example, the treated water outflow section 9.

In the settling pond 1 having the above configuration, the treated water is treated as follows. The treated water that has flowed into the treated water inflow section 2 of the settling pond 1 from the equipment on the upstream side is downstream from the treated water inflow section 2, which is the most upstream portion of the treated water in the settling pond 1, in the length direction of the settling pond 1. It flows toward the side (X axis + side). In this process, pollutants and flocs containing solid particles in the treated water settle and deposit at the bottom of the settling basin 1. Sediments deposited on the bottom of the settling basin 1, such as sludge, are scraped off by the scraper 4 and collected in the pit 3.

More specifically, the scraper 4 circulates and drives the pair of chains 41 by driving the drive device 44 and rotating the sprocket wheel 42. As a result, a plurality of elongated plate-shaped flights 43 extending in the width direction (Y-axis direction) of the settling pond 1 and having both ends attached to the pair of chains 41 are formed along the bottom of the settling pond 1. Moves from the downstream side (X-axis + side) to the upstream side (X-axis-side). As a result, the sediment deposited on the bottom of the sedimentation basin 1 is scraped into the pit 3. The deposits collected in the pit 3 are pumped out, for example, from the outlet of the pit 3.

The treated water that flows along the bottom of the sedimentation pond 1 and passes below the blocking wall 5 flows upward from the lower end of the sedimentation device 6. Further, in the sedimentation basin 1, the treated water flowing above the lower end of the blocking wall 5 is blocked by the blocking wall 5 and flows toward the bottom of the sedimenting basin 1 so as to pass through the lower end of the blocking wall 5. , Flows upward from the lower end of the settling device 6.

As described above, the settling device 6 includes an inclined portion 61. The inclined portion 61 includes, for example, a plurality of inclined plates or inclined pipes. That is, the settling device 6 is, for example, an inclined plate settling device provided with a plurality of inclined plates, or an inclined pipe settling device provided with an inclined pipe. The inclined pipe includes, for example, a plurality of inclined flow paths.

The treated water that has flowed upward from the lower end of the settling device 6 flows upward along the slope of the inclined portion 61. In the process, pollutants and flocs containing solid particles in the treated water settle and deposit on the slope of the inclined portion 61. The treated water from which pollutants and flocs have settled and removed by passing through the inclined portion 61 passes through the overflow trough 8 and flows out from the treated water outflow portion 9 to the equipment on the downstream side of the sedimentation pond 1.

When the settling device 6 has the inclined portion 61, pollutants and floc deposits in the treated water can be settled and deposited and removed in a wider area. That is, it is possible to shorten the distance for precipitating and removing pollutants containing solid particles in the treated water, and it is possible to improve the sedimentation efficiency and separation efficiency of pollutants and flocs. Further, a part of the deposits on the slope of the inclined portion 61 slides down the slope of the inclined portion 61 and falls to the bottom of the sedimentation pond 1. As a result, the frequency of removing the deposits deposited on the inclined portion 61 can be reduced. However, there is a problem that the deposits adhering to and deposited on the slope of the inclined portion 61 without sliding down the slope of the inclined portion 61 cannot be easily removed by the conventional technique.

Specifically, as in the conventional vibration type thickener described above, even if the inclined portion 61 is vibrated, the deposits containing solid particles deposited on the inclined portion 61 cannot be sufficiently removed. More specifically, for example, even if the inclined portion 61 is vibrated at a frequency of 264 [Hz] to 383 [Hz] with an amplitude of 1 [mm] or less by using a ball vibrator, the inclined portion 61 is inclined. Sediments deposited on the site are not sufficiently removed. Further, even if the inclined portion 61 is vibrated at a frequency of 153 [Hz] to 414 [Hz] with an amplitude of 1 [mm] or less by using a turbine vibrator, for example, deposits are deposited on the slope of the inclined portion 61. Things are not removed enough. Further, even if the inclined portion 61 is vibrated at a frequency of 79 [Hz] to 117 [Hz] with an amplitude of 1 [mm] or less by using a piston vibrator, for example, deposits are deposited on the slope of the inclined portion 61. Things are not removed enough.

For example, when the treated water flowing into the sedimentation basin 1 is sewage, the main deposit adhering to the slope of the inclined portion 61 is sludge. When the sludge adhering to the inclined portion 61 is left for a long time of, for example, two days or more, gas is generated by a biological reaction. Due to this gas, deposits adhering to the inclined portion 61 may float on the surface of the treated water and deteriorate the quality of the treated water.

As a technique for removing the deposits adhering to the inclined portion 61, it is conceivable to introduce an air cleaning device. The air cleaning device, for example, operates a blower to eject air bubbles from the air diffuser tube to agitate and vibrate the inclined portion 61 and peel off the deposits adhering to the inclined portion 61. However, such an air cleaning device requires a relatively large amount of power in order to eject a large amount of air bubbles from the air diffuser pipe. Further, since the sediment exfoliated from the inclined portion 61 is agitated by air bubbles and dispersed in the treated water or floats on the water surface, it is necessary to stop the inflow of the treated water into the sedimentation pond 1 during the cleaning of the inclined portion 61. There is.

The configuration of each part of the settling device 6 and the deposit removing device 7 according to the embodiment of the present disclosure, which can solve the above-mentioned problems of the prior art, will be described in detail with reference to FIGS. 2 to 7. explain.

FIG. 2 is a schematic enlarged cross-sectional view of the sedimentation device 6 and the sediment removal device 7 shown in FIG. FIG. 3 is an enlarged view of the elevating portion 62 shown in FIG. FIG. 4 is a pneumatic circuit diagram showing an example of the configuration of the elevating unit 62. As described above, the deposit removing device 7 of the present embodiment has an elevating unit 62 that elevates and elevates the inclined portion 61 on which pollutants of treated water are deposited, and a control unit that controls the elevating and lowering of the inclined portion 61 by the elevating portion 62. It has 63 and.

Further, as described above, the settling device 6 of the present embodiment includes an inclined portion 61 and a deposit removing device 7. That is, the settling device 6 of the present embodiment controls an inclined portion 61 on which pollutants contained in the treated water is deposited, an elevating portion 62 for raising and lowering the inclined portion 61, and an elevating portion 61 by the elevating portion 62. A control unit 63 and a control unit 63 are provided.

As described above, the inclined portion 61 includes, for example, a plurality of inclined plates 61a or inclined pipes. In the settling device 6 of the present embodiment, the inclined portion 61 includes a plurality of inclined plates 61a. That is, the settling device 6 of the present embodiment is an inclined plate settling device. When the inclined portion 61 includes an inclined pipe, the inclined pipe has, for example, a plurality of inclined tubular flow paths. In this case, the settling device 6 is an inclined pipe settling device.

Although not particularly limited, an example of the dimensions of the inclined plate 61a is as follows. The dimension of the inclined plate 61a along the width direction (Y-axis direction) of the sedimentation pond 1 in the longitudinal direction is, for example, about 1 [m] to 2 [m]. The dimension of the inclined plate 61a inclined with respect to the depth direction (Z-axis direction) of the sedimentation pond 1 in the lateral direction is, for example, about 0.3 [m] to 1 [m]. The plate thickness of the inclined plate 61a is, for example, about 1 [mm] to 3 [mm].

The inclined portion 61 has, for example,, in addition to the plurality of inclined plates 61a, a frame 61b for supporting the plurality of inclined plates 61a, and a connecting portion 61c for connecting the inclined plates 61a to the frame 61b. The frame 61b includes, for example, a horizontal frame portion 61b1 extending along the length direction (X-axis direction) of the settling pond 1 and a vertical frame portion 61b2 extending along the depth direction (Z-axis direction) of the settling pond 1. I have. The materials of the inclined plate 61a and the frame 61b are not particularly limited, and may be made of, for example, a corrosion-resistant metal or resin. The details of the connecting portion 61c will be described later.

Two horizontal frame portions 61b1 of the frame 61b are vertically separated from each other at one end and the other end of the plurality of inclined plates 61a, for example, in the width direction (Y-axis direction) of the sedimentation pond 1. The horizontal frame portion 61b1 of the frame 61b is arranged, for example, substantially parallel to the length direction (X-axis direction) of the sedimentation pond 1. The horizontal frame portion 61b1 of the frame 61b is connected to, for example, the end portion of the inclined plate 61a in the width direction of the sedimentation pond 1, that is, one end and the other end in the longitudinal direction of the inclined plate 61a via the connecting portion 61c, and a plurality of portions It supports the inclined plate 61a.

For example, in the width direction (Y-axis direction) of the sedimentation pond 1, two vertical frame portions 61b2 of the frame 61b are provided at one end and the other end of the plurality of inclined plates 61a on the upstream side in the length direction of the sedimentation pond 1. (X-axis-side) and downstream side (X-axis + side) are separated from each other. The vertical frame portion 61b2 of the frame 61b is arranged substantially parallel to the depth direction (Z-axis direction) of the sedimentation pond 1, for example, and the upper end portion extends to the upper part of the water above the water surface of the treated water. The vertical frame portion 61b2 of the frame 61b is connected to, for example, two horizontal frame portions 61b1 arranged apart from each other in the depth direction of the sedimentation pond 1, and has a plurality of inclinations via the horizontal frame portion 61b1 and the connecting portion 61c. It supports the plate 61a.

Further, the vertical frame portion 61b2 of the frame 61b has, for example, a shaft portion 61b3 at the upper end portion. The shaft portion 61b3 extends outward in the width direction (Y-axis direction) of the settling pond 1, for example, and is supported from below by the outer edge portion of the settling pond 1. The shaft portion 61b3 may extend inward in the width direction of the sedimentation pond 1, for example. In this case, a beam extending in the length direction (X-axis direction) of the settling pond 1 may be hung inside the outer edge portion in the width direction of the settling pond 1, and the shaft portion 61b3 may be supported from below by the beam.

As described above, the elevating portion 62 is configured to elevate and elevate the inclined portion 61 on which the pollutants of the treated water are deposited. The elevating part 62 is provided above the surface of the treated water in the sedimentation pond 1. More specifically, the elevating portion 62 is supported and fixed to, for example, the outer edge portion of the sedimentation pond 1 that supports the shaft portion 61b3 provided on the frame 61b of the inclined portion 61 from below. More specifically, the elevating portion 62 is supported and fixed to the outer edge portion of the sedimentation pond 1 via, for example, a fixing bracket 11.

The elevating portion 62 has, for example, a supporting portion 64 that supports the inclined portion 61 on both sides in the width direction (Y-axis direction) intersecting the flow direction (X-axis direction) of the treated water. The elevating portion 62 raises and lowers the inclined portion 61 supported by the support portion 64, for example, by raising and lowering the support portion 64. More specifically, the support portion 64 is provided so as to support the shaft portion 61b3 provided on the frame 61b of the inclined portion 61 from below and move up and down, for example.

Further, the support portion 64 is configured to support the inclined portion 61 with play in at least one direction, for example. More specifically, the support portion 64 has, for example, a support bottom portion 64b that supports the inclined portion 61 from below, and movement restricting portions 64a that face each other on both sides of the inclined portion 61 via a gap. Further, the support portion 64 is open above the support bottom portion 64b. More specifically, in the example shown in FIG. 3, the support portion 64 is formed into, for example, a U-shape, a J-shape, or a hook-like shape having an arc-shaped cross section with an open upper portion. The support portion 64 may have a shape in which the upper portion is closed, such as an annular shape, or may be composed of a plurality of parts.

The support portion 64 supports the shaft portion 61b3 provided on the frame 61b of the inclined portion 61 by, for example, the support bottom portion 64b of the bottom portion having a hook shape. The movement restricting portion 64a of the support portion 64 has the shaft portion 61b3 of the frame 61b of the inclined portion 61 supported on the support bottom portion 64b in the length direction (X-axis) of the sedimentation pond 1 with respect to the shaft portion 61b3. It is provided so as to face each other with a gap on both sides of the direction). That is, in the example shown in FIG. 3, the support portion 64 has, for example, the upstream direction (X-axis − direction) of the sedimentation pond 1, the downstream direction (X-axis + direction) of the sedimentation pond 1, and at least three upward directions. It is configured to have play and support the inclined portion 61.

The elevating unit 62 has, for example, an air cylinder 65 and a speed controller 66 provided on the air cylinder 65. Further, the support portion 64 is connected to, for example, the piston rod 65a of the air cylinder 65. The elevating part 62 raises and lowers the support part 64 connected to the piston rod 65a by expanding and contracting the piston rod 65a of the air cylinder 65. The elevating portion 62 is not limited to the configuration including the air cylinder 65, and the supporting portion 64 may be elevated or lowered by an elevating mechanism using, for example, a gear, a motor, a ball screw, a chain, a wire rope, or a link mechanism. Good.

As shown in FIG. 4, the elevating unit 62 includes, for example, an air cylinder 65, a speed controller 66, an air supply unit 67, a filter / regulator 68, and a solenoid valve 69. The elevating unit 62 is provided with, for example, two air cylinders 65 on one side and two on the other side in the width direction (Y-axis direction) of the sedimentation pond 1, for a total of four air cylinders 65.

All four air cylinders 65 have the same configuration as the air cylinder 65 shown in FIG. Therefore, in FIG. 4, only the two air cylinders 65 and their associated configurations are shown, and the other two air cylinders 65 and their associated configurations are not shown. The number of air cylinders 65 included in the elevating unit 62 is not particularly limited.

The air supply unit 67 includes, for example, a compressor for compressing air and a tank for storing the compressed air, and is connected to the filter / regulator 68 via a rubber hose for air. The air supply unit 67 supplies the compressed air to the filter / regulator 68 based on the control signal from the control unit 63. The filter / regulator 68 is, for example, a pressure reducing valve having a built-in filter. The filter / regulator 68 is connected to a solenoid valve 69 provided for each air cylinder 65 via an air tube, and supplies clean air decompressed to a predetermined pressure to the solenoid valve 69.

The solenoid valve 69 is, for example, a solenoid valve having four directions, four ports, and three positions. Based on the control signal of the control unit 63, for example, the solenoid valve 69 switches between a state in which all the ports shown in FIG. 4 are closed, a state in which the right side is excited, and a state in which the left side is excited.

When the right side of the solenoid valve 69 is excited, the arrows on the right side intersect, the ports 1 and 2 are connected, and the ports 4 and 3 are connected. In this state, when compressed air is supplied to the solenoid valve 69 via the filter / regulator 68, the check valve of the speed controller 66 on the lower side in FIG. 4 opens, and the check valve on the lower side of the air cylinder 65 in FIG. 4 opens. Compressed air is supplied to.

As a result, the piston rod 65a of the air cylinder 65 moves upward in FIG. 4 and contracts, and the support portion 64 rises. Further, as the piston rod 65a contracts, air is discharged from the upper side of the air cylinder 65 in FIG. 4 and flows into the speed controller 66 on the upper side in FIG. Then, the check valve of the speed controller 66 on the upper side in FIG. 4 closes, and air is discharged through the flow rate control valve.

Further, when the left side of the solenoid valve 69 is excited, the arrows on the left side become parallel, the ports 1 and 4 are connected, and the ports 2 and 3 are connected. In this state, when compressed air is supplied to the solenoid valve 69 via the filter / regulator 68, the check valve of the speed controller 66 on the upper side in FIG. 4 opens, and the check valve on the upper side of the air cylinder 65 in FIG. 4 opens. Compressed air is supplied to.

As a result, the piston rod 65a of the air cylinder 65 moves downward in FIG. 4 and extends, and the support portion 64 descends. Further, as the piston rod 65a extends, air is discharged from the lower side of the air cylinder 65 in FIG. 4 and flows into the speed controller 66 on the lower side in FIG. Then, the check valve of the speed controller 66 on the lower side in FIG. 4 closes, and air is discharged through the flow rate control valve.

That is, in the present embodiment, the speed controller 66 is configured to perform meter-out control of the air cylinder 65. Further, in the speed controller 66, for example, the flow rate of air passing through the flow control valve of the lower speed controller 66 in FIG. 4 is larger than the flow rate of air passing through the flow control valve of the upper speed controller 66 in FIG. Is also set to be large.

In other words, in the speed controller 66, for example, the air flow rate of the flow control valve that allows the air discharged from the air cylinder 65 to pass through when the piston rod 65a is extended causes the air discharged from the air cylinder 65 to pass through when the piston rod 65a contracts. It is larger than the air flow rate of the flow control valve to be passed. As a result, in the example shown in FIG. 3, the lowering speed of the support portion 64 connected to the piston rod 65a and supporting the inclined portion 61 becomes faster than the ascending speed of the support portion 64.

With such a configuration, the elevating portion 62 is configured such that, for example, the descending speed of the inclined portion 61 is higher than the ascending speed of the inclined portion 61. The configuration of the elevating portion 62 in which the descending speed of the inclined portion 61 is higher than the ascending speed of the inclined portion 61 is not limited to the configuration shown in FIG.

FIG. 5 is an enlarged cross-sectional view showing a modified example of the elevating portion 62 of FIG. In the example shown in FIG. 3, the air cylinders 65 constituting the elevating part 62 were arranged along the vertical direction, and the expansion and contraction direction of the piston rod 65a was the direction along the vertical direction. On the other hand, in the modified example shown in FIG. 5, the air cylinder 65 is arranged along the horizontal direction, and the expansion and contraction direction of the piston rod 65a is the direction along the horizontal direction. Further, in this modified example, the elevating portion 62 includes a lever mechanism 70.

In the modified example shown in FIG. 5, the air cylinder 65 is supported and fixed to the outer edge of the sedimentation pond 1 via, for example, a fixing bracket 12 and a support shaft 13. The lever mechanism 70 includes, for example, a first arm 71, a second arm 72, a support shaft 73, and a connecting shaft 74.

The first arm 71 extends, for example, along the vertical direction. The second arm 72 is connected to the lower end of the first arm 71 and extends along the horizontal direction, for example. The length of the first arm 71 along the vertical direction is longer than the length of the second arm 72 along the horizontal direction. The first arm 71 and the second arm 72 have a substantially L-shaped shape. The support portion 64 is fixed on the second arm 72.

The support shaft 73 extends along the width direction (Y-axis direction) of the sedimentation pond 1, for example, and is attached to a connecting portion between the first arm 71 and the second arm 72. The support shaft 73 rotatably supports, for example, the first arm 71 and the second arm 72 about the support shaft 73. The connecting shaft 74 is attached to the upper part of the first arm 71, for example, and connects the first arm 71 and the piston rod 65a.

With such a configuration, in the elevating part 62 according to the modified example shown in FIG. 5, when the piston rod 65a of the air cylinder 65 contracts, the first arm 71 and the second arm 72 rotate around the support shaft 73. , The support portion 64 rises. Further, when the piston rod 65a of the air cylinder 65 is extended, the elevating portion 62 is positioned at the original position from the position where the support portion 64 is raised by rotating the first arm 71 and the second arm 72 around the support shaft 73. Descend to.

Similarly to the elevating part 62 shown in FIG. 3, the elevating part 62 according to the modified example shown in FIG. 5 may be configured so that the descending speed of the support part 64 is higher than the ascending speed of the support part 64. it can. That is, in the speed controller 66, for example, the air flow rate of the flow control valve that allows the air discharged from the air cylinder 65 to pass when the piston rod 65a is extended passes through the air discharged from the air cylinder 65 when the piston rod 65a contracts. It is more than the air flow rate of the flow control valve.

When the elevating part 62 does not have the air cylinder 65, for example, by using a cam mechanism or the like, the lowering speed of the support part 64 can be configured to be faster than the ascending speed of the support part 64. it can. Further, for example, when the elevating unit 62 includes a servomotor, the control unit 63 controls the elevating unit 62 so that the descending speed of the inclined portion 61 is higher than the ascending speed of the inclined portion 61. The control unit 63 may be configured.

Further, even when the elevating portion 62 includes the air cylinder 65, for example, by automatically controlling the flow control valve of the speed controller 66 constituting the elevating portion 62, the descending speed of the inclined portion 61 is set from the ascending speed of the inclined portion 61. The control unit 63 may be configured so as to increase the speed. In this way, the control unit 63 can control the elevating unit 62 so that, for example, the descending speed of the inclined portion 61 is higher than the ascending speed of the inclined portion 61.

Here, a configuration example of the connecting portion 61c that connects the inclined plate 61a of the inclined portion 61 and the frame 61b will be described in detail. FIG. 6 is a perspective view showing a configuration example of the inclined portion 61 constituting the settling device 6 of FIG. As described above, the inclined portion 61 has, for example, a plurality of inclined plates 61a, a frame 61b for supporting the plurality of inclined plates 61a, and a connecting portion 61c for connecting the inclined plates 61a to the frame 61b. ing. The frame 61b includes, for example, a horizontal frame portion 61b1 extending along the length direction (X-axis direction) of the settling pond 1 and a vertical frame portion 61b2 extending along the depth direction (Z-axis direction) of the settling pond 1. I have.

The connecting portion 61c has, for example, a first portion 61c1 fixed to the inclined plate 61a and a second portion 61c2 fixed to the frame 61b. The first portion 61c1 and the second portion 61c2 are engaged with each other with play. More specifically, the first portion 61c1 is, for example, a plate-shaped member bent so as to have a U-shaped cross section, and both ends and the lower end in the width direction (X-axis direction) of the sedimentation pond 1. Is open. The first portion 61c1 is fixed to, for example, one end and the other end of the inclined plate 61a in the width direction (X-axis direction) of the settling pond 1 at intervals of two at the top and bottom. ..

The second portion 61c2 is, for example, a shaft-shaped or rod-shaped member extending in the width direction of the sedimentation pond 1, a diameter-expanded portion for preventing slipping is formed at the tip, and the base end opposite to the tip is a horizontal frame of the frame 61b. It is fixed to the portion 61b1. The second portion 61c2 is provided at a position corresponding to the first portion 61c1 fixed to the inclined plate 61a in the horizontal frame portion 61b1.

In order to connect the inclined plate 61a to the frame 61b, the first portion 61c1 of the connecting portion 61c fixed to the inclined plate 61a is hooked on the second portion 61c2 of the connecting portion 61c fixed to the frame 61b. As a result, the first portion 61c1 and the second portion 61c2 are engaged with each other in a state where there is play on the lower side of the second portion 61c2. Further, for example, by making the groove width of the first portion 61c1 that engages the second portion 61c2 larger than the diameter of the second portion 61c2, the first portion 61c1 and the second portion 61c2 are formed in the sedimentation pond 1. Engage with play in the length direction (X-axis direction).

The configuration in which the inclined plate 61a and the frame 61b are connected with play is not limited to the configuration shown in FIG. FIG. 7 is a perspective view showing a modified example of the connecting portion 61c that connects the inclined plate 61a and the frame 61b shown in FIG. In the example shown in FIG. 7, the connecting portion 61c has a portion fixed to the inclined plate 61a and a through hole through which the rod-shaped horizontal frame portion 61b1 of the frame 61b is inserted. In this example, by making the diameter of the through hole of the connecting portion 61c larger than the diameter of the horizontal frame portion 61b1, it is possible to connect the inclined plate 61a and the frame 61b with play.

Further, when the inclined portion plate 61 is firmly connected to the frame 61b, for example, the connecting portion between the horizontal frame portion 61b1 and the vertical frame portion 61b2 may have play. Specifically, the connecting portion between the horizontal frame portion 61b1 and the vertical frame portion 61b2 is formed by a long hole and a pin, and a play or a gap in at least one direction is formed between the long hole and the pin. Further, the frame may be composed of a plurality of parts that can be divided, and the connecting portion of each component may be composed of an elongated hole and a pin to form a play or a gap in at least one direction between the elongated hole and the pin.

Hereinafter, the operations of the settling device 6 and the deposit removing device 7 of the present embodiment will be described.

As described above, in the settling device 6 of the present embodiment, the inclined portion 61 on which the pollutant contained in the treated water is deposited, the elevating portion 62 for raising and lowering the inclined portion 61, and the inclined portion 61 by the elevating portion 62. It includes a control unit 63 that controls ascending and descending. Further, the deposit removing device 7 of the present embodiment includes an elevating unit 62 that elevates and elevates the inclined portion 61 on which pollutants in the treated water are deposited, and a control unit 63 that controls the elevating and lowering of the inclined portion 61 by the elevating portion 62. It has.

With such a configuration, by controlling the elevating portion 62 by the control unit 63, the inclined portion 61 can be raised by the elevating portion 62. Further, by controlling the elevating unit 62 by the control unit 63, the inclined portion 61 can be lowered by the elevating unit 62. That is, the control unit 63 can control the elevating unit 62 so as to raise the inclined portion 61 and then lower the inclined portion 61 when removing the deposits deposited on the inclined portion 61. Further, the control unit 63 can control the elevating unit 62 so that the inclined portion 61 is raised in advance and the inclined portion 61 is lowered when the deposits accumulated on the inclined portion 61 are removed.

From the viewpoint of more efficiently removing the deposits accumulated on the inclined portion 61, a reciprocating ascending / descending operation is performed in which the inclined portion 61 is raised and then lowered, or the inclined portion 61 is lowered and then raised. As described above, it is preferable to control the elevating unit 62 by the control unit 63. It should be noted that the reciprocating ascending / descending operation in which the inclined portion 61 is raised and then lowered is more effective in removing the deposits accumulated on the inclined portion 61 than the reciprocating ascending / descending operation in which the inclined portion 61 is lowered and then raised. can do.

As described above, in the settling device 6 and the deposit removing device 7 of the present embodiment, the elevating unit 62 can be controlled by the control unit 63, and the inclined portion 61 can be moved up and down by the elevating unit 62. As a result, the deposits deposited on the inclined portion 61 receive a large fluid resistance from the treated water and are efficiently removed as compared with the case where the inclined portion 61 is vibrated at a relatively high frequency as in the conventional case. If the continuous and periodic ascending / descending motion of the inclined portion 61 by the elevating portion 62 is regarded as vibration, the frequency is, for example, 1 [Hz] or less, and the amplitude is, for example, 1 [mm] or more. Is.

Further, from the viewpoint of more reliably removing the deposits accumulated on the inclined portion 61, it is preferable to control the elevating portion 62 by the control unit 63 so that the inclined portion 61 is moved up and down a plurality of times. The ascending and descending operation of the inclined portion 61 by the elevating part 62 may be performed once or continuously and repeatedly, and a period during which the ascending and descending operation is stopped between ascending and descending, or between ascending and descending. May be provided to raise and lower intermittently. By controlling the elevating unit 62 by the control unit 63 provided with a program for performing various elevating operations of the inclined portion 61 as described above, various elevating operations of the inclined portion 61 as described above can be performed.

Further, the height of the elevating operation of the inclined portion 61 is preferably, for example, 10 [mm] or more and 30 [mm] or less. As a result, when the inclined portion 61 is raised and lowered, a larger fluid resistance is applied to the deposit from the treated water to improve the effect of removing the deposit and reduce the power of the raising and lowering portion 62 required for the raising and lowering operation. it can. Further, by controlling the elevating portion 62 by the control unit 63 so that the time from raising the inclined portion 61 to starting the descent of the inclined portion 61 is 10 [seconds] or less, the inclined portion 61 can be reached. The effect of removing the deposited sediment can be further improved.

Further, the elevating portion 62 may be configured so that the shaft portion 61b3 provided on the frame 61b of the inclined portion 61 collides with the peripheral edge portion of the sedimentation pond 1 at the end of the descending operation of the inclined portion 61. As a result, at the end of the lowering operation of the inclined portion 61 by the elevating portion 62, the inclined portion 61 is vibrated by the impact force acting on the inclined portion 61 from the peripheral edge portion of the sedimentation pond 1, and the inclined portion 61 contains solid particles deposited on the inclined portion 61. The effect of removing deposits can be improved. In this case, the inclined portion 61 is preferably composed of a plurality of inclined plates 61a. As a result, the inclined plate 61a can be effectively vibrated, and the deposits deposited on the inclined plate 61a can be effectively removed.

The deposits separated from the inclined portion 61 by such an ascending / descending operation of the inclined portion 61 aggregate and coarsen in the treated water, slide down the slope of the inclined portion 61, and settle at the bottom of the sedimentation basin 1. As a result, unlike a conventional air cleaning device, the deposits separated from the inclined portion 61 are prevented from being agitated by air bubbles and dispersed in the treated water or floating on the water surface, and the deposits are efficiently removed. The quality of treated water can be improved. Therefore, unlike the conventional air cleaning device, it is not necessary to stop the inflow of the treated water into the settling pond 1 during cleaning of the inclined portion 61, and the treatment efficiency of the treated water by the settling pond 1 can be improved.

Further, the elevating unit 62 and the control unit 63 constituting the sedimentation device 6 and the sediment removal device 7 do not need to be installed in the treated water as in the conventional air cleaning device, and are higher than the water surface of the treated water in the sedimentation pond 1. It can be installed above the water above. Therefore, the maintainability of the sedimentation device 6 and the sediment removal device 7 can be improved as compared with the conventional air cleaning device installed in the treated water.

Further, the settling device 6 and the deposit removing device 7 of the present embodiment are configured to raise and lower the inclined portion 61 by the elevating portion 62. Therefore, for example, unlike a device that changes the inclination angles of a plurality of inclined plates 61a of the inclined portion 61, a plurality of inclined plates 61 in the length direction (X-axis direction) or the width direction (Y-axis direction) of the sedimentation basin 1. It is possible to install the settling device 6 or a plurality of sediment removing devices 7 adjacent to each other.

Further, in the settling device 6 and the deposit removing device 7 of the present embodiment, the elevating portion 62 is configured such that, for example, the descending speed of the inclined portion 61 is higher than the ascending speed of the inclined portion 61. Alternatively, in the settling device 6 and the deposit removing device 7 of the present embodiment, the control unit 63 controls the elevating unit 62 so that the descending speed of the inclined portion 61 is faster than the ascending speed of the inclined portion 61. Has been done.

With such a configuration, the elevating portion 62 can vigorously lower the inclined portion 61 to improve the efficiency of removing the deposits deposited on the inclined portion 61. As an example, the ascending speed of the inclined portion 61 is about 30 [mm / s], and the descending speed of the inclined portion 61 is about 50 [mm / s]. As a result, at the end of the descending operation of the inclined portion 61, a relatively large inertial force is applied to the inclined portion 61, and the deposits accumulated on the inclined portion 61 can be effectively removed.

The descending speed of the inclined portion 61 by the elevating portion 62 can be equal to or higher than, for example, the falling speed of the inclined portion 61 due to free fall. As a result, at the end of the lowering operation of the inclined portion 61, for example, the inclined portion 61 such as the inclined plate 61a vibrates while bending, so that the effect of removing the deposits deposited on the inclined portion 61 can be improved. On the other hand, when the ascending speed of the inclined portion 61 is equal to or higher than the descending speed of the inclined portion 61, the sediment separated from the inclined portion 61 floats on the water surface of the treated water and flows to the downstream side of the sedimentation basin 1. Sediments may be mixed into the water and deteriorate the water quality.

Further, in the settling device 6 and the deposit removing device 7 of the present embodiment, the elevating part 62 has the inclined parts 61 on both sides in the width direction (Y-axis direction) intersecting the flow direction (X-axis direction) of the treated water. It has a support portion 64 to support. The support portion 64 is configured to support the inclined portion 61 with play in at least one direction.

With this configuration, it is possible to easily vibrate the inclined portion 61 as the inclined portion 61 moves up and down by the elevating portion 62, and the deposits accumulated on the inclined portion 61 can be removed more effectively. Further, by supporting the inclined portion 61 by the supporting portion 64 of the elevating portion 62 instead of fixing the inclined portion 61 to the elevating portion 62, for example, when an earthquake occurs, the relative between the inclined portion 61 and the elevating portion 62. It is possible to prevent the elevating part 62 from being damaged by allowing a large movement.

Further, in the settling device 6 and the deposit removing device 7 of the present embodiment, the support portion 64 is a movement restricting portion that faces the support bottom portion 64b that supports the inclined portion 61 from below and both sides of the inclined portion 61 via a gap. It has 64a and.

With this configuration, in the support portion 64, the gap between the inclined portion 61 and the movement restricting portion 64a becomes a play between the inclined portion 61, and the inclined portion 61 can be easily vibrated. Further, the support portion 64 can restrict the movement of the inclined portion 61 to the outside while allowing the movement of the inclined portion 61 between the movement restricting portions 64a on both sides of the inclined portion 61. As a result, it is possible to prevent the inclined portion 61 from falling off from the support portion 64 while allowing the relative movement of the inclined portion 61 and the elevating portion 62.

Further, in the settling device 6 and the deposit removing device 7 of the present embodiment, the support portion 64 is open above the support bottom portion 64b.

With this configuration, when an acceleration in the vertical direction is generated in the inclined portion 61 due to an earthquake, for example, the upper part of the support bottom portion 65b that supports the inclined portion 61 from below is opened, so that the inclined portion 61 is vertically upward in the vertical direction. Movement to can be tolerated. As a result, damage to the support portion 64 and the elevating portion 62 can be prevented.

Further, in the settling device 6 and the deposit removing device 7 of the present embodiment, the elevating part 62 has an air cylinder 65 and a speed controller 66 provided on the air cylinder 65. Further, the support portion 64 is connected to the piston rod 65a of the air cylinder 65.

With this configuration, the settling device 6 and the deposit removing device 7 of the present embodiment significantly reduce the amount of air required to remove the deposits deposited on the inclined portion 61 as compared with the conventional air cleaning device. It can be reduced. As a result, the power required to remove the deposits deposited on the inclined portion 61 can be significantly reduced as compared with the conventional air cleaning device. Further, the elevating portion 62 is connected to the piston rod 65a, and the ascending speed and the descending speed of the supporting portion 64 that supports and elevates the inclined portion 61 can be adjusted by the speed controller 66.

Further, in the settling device 6 of the present embodiment, the inclined portion 61 includes a plurality of inclined plates 61a, a frame 61b for supporting the plurality of inclined plates 61a, and a connecting portion 61c for connecting the inclined plates 61a to the frame 61b. ,have. Further, the connecting portion 61c has a first portion 61c1 fixed to the inclined plate 61a and a second portion 61c2 fixed to the frame 61b. The first portion 61c1 and the second portion 61c2 are engaged with each other with play.

With this configuration, the inclined plate 61a constituting the inclined portion 61 can be easily vibrated by the ascending / descending operation of the inclined portion 61. As a result, the efficiency of removing the deposits deposited on the inclined plate 61a can be further improved.

As described above, according to the present embodiment, it is possible to provide the sedimentation device 6 and the deposit removal device 7 capable of removing the deposits deposited on the inclined portion 61 more effectively than before.

Although the embodiments of the deposit removing device and the sedimentation device according to the present disclosure have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment and does not deviate from the gist of the present disclosure. Any design changes, etc. within the scope are included in this disclosure.

For example, in the above-described embodiment, the example in which the settling device 6 and the sediment removing device 7 are applied to the one-layer settling basin 1 has been described. It is also possible to apply a sediment removal device. An example of a two-story sedimentation pond is shown in FIG. As shown in the upper figure of FIG. 8, the settling device 6 and the deposit removing device 7 can be applied to, for example, only two layers. In a multi-story settling basin, if the flow rate distribution is set to be even in fine weather, the flow rate of the two layers (lower layer) is increased in rainy weather due to the structure of the settling basin. As a countermeasure, it is effective to apply it to only one layer. Further, as shown in the lower figure of FIG. 8, the inclined portion 61 installed in one layer and two layers is moved up and down by the elevating part 62 and the control unit 63 of the settling device 6 and the sediment removing device 7 installed on the upper part of the water. be able to.

6 Settlement device 61 Inclined part 61a Inclined plate 61b Frame 61c Connecting part 61c1 First part 61c2 Second part 62 Elevating part 63 Control part 64 Support part 64a Movement regulation part 64b Support bottom 65 Air cylinder 65a Piston rod 66 Speed controller 7 Sediment Removal device

Claims (9)

A deposit removing device comprising: an elevating unit for raising and lowering an inclined portion on which pollutants of treated water are deposited, and a control unit for controlling the elevating and lowering of the inclined portion by the elevating part. The deposit removing device according to claim 1, wherein the elevating portion is configured such that the descending speed of the inclined portion is higher than the ascending speed of the inclined portion. The deposit removing device according to claim 1, wherein the control unit controls the elevating unit so that the descending speed of the inclined portion is higher than the ascending speed of the inclined portion. The elevating portion has a support portion that supports the inclined portion on both sides in the width direction intersecting the flow direction of the treated water.
The deposit removing device according to claim 1, wherein the support portion has play in at least one direction to support the inclined portion. The deposit removal according to claim 4, wherein the support portion has a support bottom portion that supports the inclined portion from below, and movement restricting portions that face each other on both sides of the inclined portion via a gap. apparatus. The deposit removing device according to claim 5, wherein the support portion is open above the support bottom portion. The elevating part includes an air cylinder and a speed controller provided in the air cylinder.
The deposit removing device according to claim 4, wherein the support portion is connected to a piston rod of the air cylinder. A settling device including an inclined portion on which pollutants contained in treated water are deposited, an elevating portion for raising and lowering the inclined portion, and a control unit for controlling the elevating and lowering of the inclined portion by the elevating portion. The inclined portion includes a plurality of inclined plates, a frame that supports the plurality of inclined plates, and a connecting portion that connects the inclined plates to the frame.
The connecting portion has a first portion fixed to the inclined plate and a second portion fixed to the frame.
The sedimentation device according to claim 8, wherein the first portion and the second portion are engaged with each other with play.

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