JP4633704B2 - Precipitation equipment - Google Patents

Description

  The present invention relates to a sedimentation apparatus that sediments sludge and the like in a circular tank, and more particularly to a sedimentation apparatus that discharges scum from a scum pipe.

  Conventionally, there is provided a scum skinmer that squeezes scum floating on the liquid surface of the circular tank in conjunction with a rake that rotates the bottom of the circular tank and scrapes sludge, and a scum pipe that takes in this scum and discharges it to the outside of the circular tank In addition, a precipitation device is known that separates water to be treated into sludge and supernatant.

  The scum pipe of the settling device is provided so as to extend in the radial direction of the circular tank and to be rotatable around the axis. The scum pipe has an opening for taking in the scum in the upper part and a lower part for rotating the scum pipe in the lower part. A lower bar extending in the direction is provided. A kicker that presses the lower bar is fixed to a shaft that rotatably supports the rake and the scum skinma.

Then, when the shaft was rotated, the scum skinma scraped the scum floating on the liquid level, while the kicker pushed the lower bar, the scum pipe rotated and the opening was positioned on the liquid level, and was scraped by the scum skinma Scum is taken into the scum pipe and discharged out of the circular tank. (For example, refer to Patent Document 1).
Machine Equipment Standard Specification 2005 Edited by: Japan Sewerage Corporation Publication: Sewer Business Management Center, page 5-27

  However, in the above settling device, when the shaft is reversed, the kicker pushes the lower bar from the opposite direction, reverses the scum pipe, and the opening is located at the liquid level in the forward direction of the scum skinma. There was a problem that the state in which the supernatant was swallowed continued and the return amount increased, resulting in a decrease in water treatment efficiency.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a precipitation apparatus that prevents a reduction in water treatment efficiency.

The precipitation apparatus according to the present invention includes a shaft that extends in the vertical direction at the center of the circular tank, a drive unit that rotationally drives the shaft, a rake that is fixed to the shaft at the bottom of the circular tank, and a circular tank. Formed in a cylindrical shape extending in the radial direction of the circular tank on the liquid level and provided rotatably around the axis, and an opening for taking in the scum floating on the liquid level, and downward when the opening faces upward and Sukamupaipu having a lower bar extending one end to the shaft is fixed extending radially of the circular tank, and Sukamusukinma to scrape the scum floating the liquid surface of the circular tank, in a radial direction of the circular tank from the shaft extend, and a kicker contact with the bottom bar by the rotation of the shaft, when the shaft rotates forward, the rotation of the kicker by rotation or bottom bar of the lower bar by kicker Sealed receiving the force kicker pushes the lower bar comprises the case where the shaft is reversed, the relief mechanism kicker to permit rotation of the kicker by the lower bar rotation or the lower bar by kicker release the force pressing the bottom bar It is characterized by that.

  In the precipitation apparatus according to the present invention, when the shaft is reversed, the force by which the kicker pushes the lower bar is released by the escape portion and is not transmitted to the scum pipe. Thereby, when the shaft is reversed, the scum pipe does not rotate in the direction opposite to the normal rotation of the shaft, so that it is possible to suppress a decrease in water treatment efficiency.

Here, the lower bar is fixed to the scum pipe, and the escape mechanism is movable by a kicker only when the shaft is rotated in a forward direction and a shaft support portion that rotatably supports the lower bar with respect to the scum pipe. It is preferable to include a rotation blocking unit that blocks the rotation of the unit. According to this settling device, when the shaft rotates in the forward direction, when the kicker pushes the lower bar, the rotation prevention unit prevents the rotation of the lower bar, so the scum pipe rotates, and when the shaft reverses, the kicker Even if the lower bar is pushed, the rotation preventing part does not prevent the lower bar from rotating, so that the movable part rotates relative to the scum pipe and the scum pipe does not rotate. As described above, it is possible to configure a mechanism that does not rotate the scum pipe when the shaft is reversed with a simple configuration.

The lower bar is fixed to a scum pipe, and the escape mechanism includes a shaft support portion that rotatably supports the kicker with respect to the shaft, and the kicker by the lower bar only when the shaft rotates forward. It is preferable to include a rotation prevention unit that prevents the rotation of the rotation. According to this settling device, when the shaft rotates in the forward direction, when the kicker presses the lower bar, the rotation prevention unit prevents the kicker from rotating, so the scum pipe rotates, and when the shaft reverses, the kicker Even if the bar is pushed, the rotation preventing portion does not prevent the kicker from rotating, so that the movable portion rotates with respect to the shaft and the scum pipe does not rotate. As described above, it is possible to configure a mechanism that does not rotate the scum pipe when the shaft is reversed with a simple configuration.

  Thus, according to this invention, the precipitation apparatus which prevents the fall of water treatment efficiency can be provided.

  Hereinafter, preferred embodiments of a precipitation apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a precipitation device 1 according to the first embodiment, FIG. 2 is a top view showing the precipitation device 1, FIG. 3 is a side view of the scum pipe 8, and FIG. It is a partial enlarged view. In all the drawings, the same reference numerals are used for the same or corresponding parts.

  As shown in FIG.1 and FIG.2, the sedimentation apparatus 1 concerning 1st Embodiment isolate | separates into sludge and a supernatant liquid by precipitating sludge from the to-be-processed water 2 thrown in. Therefore, the sedimentation apparatus 1 includes a circular tank 3 into which water to be treated is introduced, a shaft 4 that extends in the vertical direction at the center of the circular tank 3, and a drive unit 5 that rotationally drives the shaft 4. A rake 6 fixed to the shaft 4 at the bottom of the circular tank 3, a scum pipe 8 that takes in the scum 7 floating on the liquid surface of the circular tank 3 and discharges it to the outside of the circular tank 3, and the liquid level of the circular tank 3 And a scum skinma 9 that rakes the scum 7 floating on the scum and guides it to the scum pipe 8.

  The circular tank 3 is a tank into which the water to be treated 2 separated into sludge and supernatant liquid is charged, and has a circular cross-sectional shape. An overflow weir 10 is provided on the inner wall upper part of the circular tank 3 along the inner peripheral surface, and the supernatant liquid that has flowed over the overflow weir 10 outside the overflow weir 10 is circular. 3 is provided with an inflow trough 11 for discharging to the outside. Further, a sludge pit 12 for collecting the precipitated sludge and discharging it to the outside of the circular tank 3 is provided at the center of the bottom of the circular tank 3. In addition, the bottom part of the circular tank 3 is formed in the inverted cone shape which squeezes downward toward the center so that the settled sludge collects in the sludge pit 12.

  The drive unit 5 rotationally drives the shaft 4 in the forward rotation direction (arrow α) and the reverse direction (the direction opposite to the arrow α), and rotates the rake 6 and the scum skinma 9 in the forward rotation direction α.

  The rake 6 rotates the bottom portion of the circular tank 3 to scrape sludge, and is rotatably held by the shaft 4. Further, on the lower surface side of the rake 6, a sludge scraping plate 13 for scraping the sludge precipitated on the bottom of the circular tank 3 and collecting it in the sludge pit 12 is provided.

  The scum pipe 8 is formed in a cylindrical shape and extends in the radial direction of the circular tank 3 from a position slightly away from the shaft 4 to the outside of the circular tank 3. The scum pipe 8 is held in the circular tank 3 so as to be positioned on the liquid surface and to be rotatable around the axis.

  The scum pipe 8 is formed with a plurality of openings 14 for taking in the scum 7 in the circular tank 3, and an outlet 15 for discharging the scum 7 taken in from the opening 14 outside the circular tank 3. Is formed. The scum 7 discharged from the discharge port 15 is separated from the treated water 2 and the treated water 2 is returned to the previous stage.

  As shown in FIGS. 3 and 4, an upper bar 17 and a lower bar 18 for rotating the scum pipe 8 around the axis are fixed to the side end surface 16 on the shaft 4 side of the scum pipe 8.

  The upper bar 17 extends in an obliquely upward direction in front of the forward rotation direction α of the scum skinma 9 when the opening 14 is in a position facing upward (hereinafter referred to as “standby state”), and the scum pipe 8 rotates to open the opening. In a state where 14 is located on the liquid surface behind the forward rotation direction α (hereinafter referred to as a “swallowed state”), it is formed to extend upward.

  The lower bar 18 is formed to extend downward in the standby state. That is, the lower bar 18 extends in the direction opposite to the opening 14. The lower bar 18 includes a fixed portion 19 fixed to the scum pipe 8 and a movable portion 20 provided on the opposite side of the scum pipe 8 so as to be rotatable with respect to the fixed portion 19.

  A shaft support pin 21 for rotatably supporting the movable portion 20 is provided on the upper portion of the fixed portion 19. A rotation prevention pin 22 that protrudes toward the movable portion 20 is provided at the lower portion of the fixed portion 19 in front of the forward rotation direction α in order to prevent the movable portion 20 from rotating.

  The movable portion 20 is formed in an elongated shape extending downward from the lower end of the fixed portion 19 in the standby state, and is pivotally supported by the pivot pin 21 at the upper portion of the movable portion 20. Further, the movable portion 20 is formed such that a portion that is in front of the forward rotation direction α and is in contact with the rotation prevention pin 22 is recessed so that the movable portion 20 does not lean against the rotation prevention pin 22 in the standby state.

  As shown in FIGS. 1 and 4, the scum skinma 9 is provided with a support portion 23 extending in the radial direction of the circular tub 3 above the liquid surface of the circular tub 3, and tilts with respect to the support portion 23. A scum scraping plate 24 that is freely supported and hangs below the liquid surface of the circular tank 3 is provided. The scum scraping plate 24 is formed of an elastic body such as rubber, but may have any shape as long as the scum 7 floating on the liquid surface can be scraped, for example, a hard plate shape or a soft sheet shape. Even if it is a thing, the thing of the comb shape finely divided | segmented may be sufficient.

  Further, a return pin 25 that comes into contact with an upper bar 17 provided on the scum pipe 8 when the scum skinma 9 rotates is provided below the support portion 23 on the shaft 4 side with respect to the scum scraping plate 24. The return pin 25 is provided in a shape that intersects the upper bar 17. The return pin 25 may have any shape as long as it can contact the upper bar 17, for example, a plate shape.

  As shown in FIGS. 1, 2, and 4, the shaft 4 is formed in a rod shape extending in the vertical direction of the circular tank 3 in order to transmit the rotational driving force of the driving unit 5 to the rake 6 and the scum skinma 9. ing. A kicker 26 that abuts against the lower bar 18 provided on the scum pipe 8 when the shaft 4 rotates is fixed to the shaft 4 in front of the scum skinma 9 in the forward rotation direction α. The kicker 26 is formed in a rod shape extending from the shaft 4 in the radial direction of the circular tank 3. The kicker 26 is provided at a position where it abuts on the movable portion 20 but does not abut on the fixed portion 19. For example, the kicker 26 is fixed to the shaft 4 at a position 30 degrees ahead of the scum skinma 9 in the forward rotation direction α.

  Then, operation | movement of the precipitation apparatus 1 is demonstrated, referring FIG.5 and FIG.6.

  In the sedimentation apparatus 1, when the water to be treated 2 is introduced into the circular tank 3, the water to be treated 2 is separated into the sludge and the supernatant liquid that precipitate. This supernatant flows over the overflow weir 10 and flows into the inflow trough 11 and is discharged out of the circular tank 3. On the other hand, the precipitated sludge floats due to the gas generated by the decay, and this becomes scum 7 and floats on the liquid surface. In this state, when the drive unit 5 is driven in the forward rotation direction α, the shaft 4 rotates in the forward rotation direction α, and the rake 6 and the scum skinma 9 fixed to the shaft 4 rotate in the forward rotation direction α. When the rake 6 rotates, sludge that has settled on the bottom of the circular tank 3 is scraped by the sludge scraping plate 13, collected in the sludge pit 12, and discharged to the outside of the circular tank 3. At this time, the scum pipe 8 is in a standby state.

  When the scum skin 9 rotates, the scum 7 floating on the liquid surface of the circular tank 3 is scraped by the scum scraping plate 24 and guided to the scum pipe 8.

  At this time, prior to the rotation of the scum skinma 9, the kicker 26 approaches the scum pipe 8, contacts the lower bar 18, and pushes the movable portion 20 of the lower bar 18 in the forward rotation direction α. Here, the rotation prevention pin 22 receives the force with which the kicker 26 pushes the movable part 20 in the forward rotation direction α, and prevents the rotation of the movable part 20 relative to the fixed part 19. When the kicker 26 pushes the movable portion 20, the scum pipe 8 moves from the standby state (see FIG. 5A) to the swallowed state (see FIG. 5B) (hereinafter referred to as “forward rotation direction β”). ) Forward rotation around the axis. When the scum pipe 8 is in a swallowed state, the opening 14 is positioned at the liquid level and the upper bar 17 faces upward. The scum pipe 8 in a swallowed state takes in the scum 7 squeezed by the scum skinma 9 together with the water to be treated 2 from the opening 14 and discharges the scum pipe 8 out of the circular tank 3 from the discharge port 15. Then, the discharged scum 7 is separated from the treated water 2 and the treated water 2 is returned to the previous stage.

  Thereafter, when the scum skinma 9 rotates to the position of the scum pipe 8, the return pin 25 comes into contact with the upper bar 17 and pushes the upper bar 17 in the normal rotation direction α. When the return pin 25 pushes the upper bar 17, the scum pipe 8 moves from the swallowing state (see FIG. 5B) to the standby state (see FIG. 5C) (hereinafter referred to as “reverse direction γ”). Inverts around the axis. Then, the scum pipe 8 in the standby state finishes taking in the water to be treated 2 and the scum 7 and waits until the scum skinma 9 makes another round of the circular tank 3 and scrapes the scum 7.

  On the other hand, when the drive unit 5 is rotated in the reverse direction when the scum pipe 8 is in the standby state, the shaft 4 and the scum skinma 9 rotate in the reverse direction. Then, the kicker 26 approaches the scum pipe 8, contacts the lower bar 18, and pushes the movable portion 20 of the lower bar 18 in the reverse direction. However, since the rotation prevention pin 22 does not receive the force by which the kicker 26 pushes the movable part 20 in the reverse direction, the movable part 20 releases the pushing force of the kicker 26 when pushed by the kicker 26 in the reverse direction. It rotates with respect to the fixed portion 19 with the pivot pin 21 as an axis. Then, the scum pipe 8 is maintained in a standby state without rotating (see FIGS. 6A and 6B).

  Thereafter, when the kicker 26 passes through the scum pipe 8, the movable part 20 that is pushed and rotated by the kicker 26 hangs down so as to be pivotally supported by the pivot pin 21 by gravity and returns to its original state (FIG. 6 ( c)).

  Here, in the conventional sedimentation device 30 in which the lower bar is fixed to the scum pipe and the kicker is fixed to the shaft, the drive unit 5 is driven to rotate in the reverse direction, and the shaft 4 and the scum skinma 9 are rotated in the reverse direction. As shown in FIG. 7, the kicker 26 pushes the lower bar 31 in the reverse direction to rotate the scum pipe 8 in the reverse direction γ. Then, in the scum pipe 8, the opening 14 is positioned at the liquid level ahead of the forward rotation direction α, and the upper bar 17 sinks below the liquid level ahead of the forward rotation direction α (see FIGS. 7A and 7B). Hereinafter referred to as “inverted swallowing state”). For this reason, the scum pipe 8 cannot be returned to the standby state by the return pin 25 and is fixed in the reverse swallowing state (see FIG. 7C). As described above, in the conventional precipitation device 30, the supernatant is discharged from the scum pipe 8, and the return amount of the water to be treated 2 increases and the water treatment efficiency decreases. However, the precipitation device 1 according to the present embodiment. Then, such a problem does not occur.

  That is, in the sedimentation apparatus 1 according to the present embodiment, when the shaft 4 is reversed, the kicker 26 pushes the lower bar 18 from the reversed direction. The force pushed by the kicker 26 is such that the movable part 20 pivots the pivot pin 21. As a result of the rotation with respect to the fixed portion 19, the escape is made and the scum pipe 8 is not transmitted. As a result, when the shaft 4 is reversed, the scum pipe 8 is in a reverse swallowing state, so that the supernatant liquid is not continuously discharged from the scum pipe 8 and the return amount is not increased, thereby preventing the water treatment efficiency from being lowered. can do.

  Further, according to the precipitation device 1, when the shaft 4 rotates forward, when the kicker 26 pushes the lower bar 18, the rotation blocking pin 22 blocks the rotation of the movable portion 20, so that the scum pipe 8 rotates and the shaft 4 is reversed, even if the kicker 26 pushes the lower bar 18, the rotation preventing pin 22 does not block the rotation of the lower bar 18, so the movable part 20 rotates relative to the fixed part 19, and the scum pipe 8 rotates. Disappear. In this way, it is possible to configure a mechanism with a simple configuration that rotates the scum pipe 8 when the shaft 4 rotates normally and does not rotate the scum pipe 8 when the shaft 4 reverses.

  Next, the precipitation apparatus 40 according to the second embodiment will be described with reference to the drawings. FIG. 8 is a partially enlarged view of the precipitation device 40 according to the second embodiment. The precipitation device 40 is basically the same as the precipitation device 1 described above, and only the lower bar and the kicker are different.

  As shown in FIG. 8, in the sedimentation device 40, one lower bar 41 extending downward is fixed to the side end face 16 of the scum pipe 8 in the standby state, and the shaft 4 is rotated by the shaft 4. A kicker 42 that abuts against the lower bar 41 is provided. The kicker 42 is fixed to the shaft 4 and extends in the radial direction of the circular tank 3. The kicker 42 extends in the radial direction of the circular tank 3, and is movable so as to be rotatable with respect to the fixed part 43 above the fixed part 43. Part 44. On the shaft 4 side of the fixed portion 43, a pivot pin 45 for pivotally supporting the movable portion 44 is provided. A rotation blocking pin 46 protruding upward is provided behind the fixed portion 43 in the forward rotation direction α on the scum pipe 8 side to block the rotation of the movable portion 44. The movable portion 44 is formed on an elongated shape that extends longer to the scum pipe 8 side than the fixed portion 43, and is pivotally supported by the pivot pin 45 at the shaft 4 side end portion of the movable portion 44.

  According to this settling device, when the shaft 4 rotates in the forward direction, when the kicker 42 pushes the lower bar 41, the rotation prevention pin 46 prevents the movable portion 44 from rotating, so that the scum pipe 8 rotates and the shaft 4 When reversing, even if the kicker 42 pushes the lower bar 18, the rotation prevention pin 46 does not prevent the rotation of the movable part 44, so that the movable part 44 rotates relative to the fixed part 43 and the scum pipe 8 does not rotate. In this way, it is possible to configure a mechanism with a simple configuration that rotates the scum pipe 8 when the shaft 4 rotates normally and does not rotate the scum pipe 8 when the shaft 4 reverses.

  The present invention has been specifically described above based on the embodiment. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, the return pin 25 is fixed to the scum skinma 9 and the kicker. 26 (42) has been described as being fixed to the shaft 4, but the return pin 25 and kicker 26 (42) may be fixed to anything as long as the shaft 4 rotates, for example, the return pin 25 May be fixed to the shaft 4, and the kicker 26 (42) may be fixed to the scum skinma 9.

  Moreover, in the said embodiment, although demonstrated that the movable part 20 (44) was pivotally supported with respect to the fixed part 19 (43), the movable part 20 (44) is the side end surface 16 (shaft 4 of the scum pipe 8). The rotation prevention pin 22 (46) may be directly provided on the side end face 16 (shaft 4) of the scum pipe 8.

It is a longitudinal cross-sectional view which shows the precipitation apparatus which concerns on 1st Embodiment. It is a top view which shows a precipitation apparatus. It is a side view of a scum pipe. It is the elements on larger scale of a precipitation apparatus. It is a figure which shows operation | movement of a scum pipe when a shaft carries out normal rotation. It is a figure which shows operation | movement of a scum pipe when a shaft reverses. It is a figure which shows operation | movement of the scum pipe in contrast when a shaft reverses. It is the elements on larger scale of the precipitation apparatus which concerns on 1st Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,40 ... Precipitation apparatus, 3 ... Circular tank, 4 ... Shaft, 5 ... Drive part, 6 ... Rake, 7 ... Scum, 8 ... Scum pipe, 9 ... Scum skinma, 14 ... Opening part, 18, 41 ... Lower bar, 19 , 43 ... fixed part, 20, 44 ... movable part, 21, 45 ... shaft support pin (relief mechanism, shaft support part), 22, 46 ... rotation prevention pin (relief mechanism, rotation prevention part), 26, 42 ... kicker.

Claims (3)

A shaft provided extending in the vertical direction in the center of the circular tank;
A drive unit for rotationally driving the shaft;
A rake fixed to the shaft at the bottom of the circular tank;
An opening that is formed in a cylindrical shape extending in the radial direction of the circular tank on the liquid surface of the circular tank and that is rotatably provided around the axis, and that takes in the scum floating on the liquid surface, and the opening includes A scum pipe having a lower bar extending downward when facing upward;
One end is fixed to the shaft and extends in the radial direction of the circular tank, and a scum skinma that scrapes the scum floating on the liquid surface of the circular tank;
A kicker extending from the shaft in the radial direction of the circular tank and abutting the lower bar by the rotation of the shaft,
When the shaft rotates normally, the kicker stops the rotation of the lower bar by the kicker or the rotation of the kicker by the lower bar, receives the force that the kicker pushes the lower bar, and the shaft reverses, A sedimentation apparatus, comprising: an escape mechanism that allows the kicker to rotate by rotating the lower bar or the kicker by the lower bar and to release the force of the kicker pushing the lower bar. The kicker is fixed to the shaft;
The escape mechanism includes a shaft support portion that rotatably supports the lower bar with respect to the scum pipe, and a rotation prevention portion that prevents the rotation of the lower bar by the kicker only when the shaft rotates forward. The precipitation apparatus according to claim 1, wherein the precipitation apparatus is provided. The lower bar is fixed to the scum pipe,
The escape mechanism includes a shaft support portion that rotatably supports the kicker with respect to the shaft, and a rotation prevention portion that prevents rotation of the kicker by the lower bar only when the shaft rotates normally. The precipitation apparatus according to claim 1.

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